For zinc alloy die castings to be electroplated surface treatment, this link is very important.
Carbide die casting summarizes the following for you: For the selection of raw materials for zinc alloy die-casting parts, regular national standard materials must be selected for product die-casting.
The shape of die-casting parts should consider the concealing ability of electroplating, and try to reduce the impervious holes, so that it is not easy to carry the solution in the washing.
The die casting and die-casting mold manufacturing design are reasonable, so that the die-casting parts will not suffer from the shortcomings of shrinkage, pinholes and looseness.
The above-mentioned shortcomings will directly affect the adhesion of the coating.
The fine layer of 0.05-0.1mm formed during the cooling process of the Magnesium die casting is very important for electroplating.
It is the top thickness of the product.Advantages: The mold manufacturing cycle is short, and the development cost is relatively low compared to the stretch mold.Disadvantages: the production process is long, the product size fluctuates greatly in the process, and the labor cost is high.StretchUse material aluminum skin.
The brightness of the cutting highlights is affected by the speed of the milling drill bit.
High-gloss and high-gloss cutting are particularly used in mobile phones, such as iphone5.
In recent years, some high-end TV metal frames have adopted high-gloss milling technology, coupled with anodizing and drawing processes, making the TV as a whole full of fashion and technological sharpness.Anodizing Anodization refers to the electrochemical oxidation of sheet metals or alloys.
There are mainly the following aspects: deformation caused by internal stress of the blank, deformation caused by cutting force and cutting heat, and deformation caused by clamping force.Process measures to reduce processing distortionReduce the internal stress of the gross cultureNatural or artificial aging and vibration treatment can partially eliminate the internal stress of the blank.
On the one hand, it can grind a sharp cutting edge, and on the other hand, it can reduce cutting deformation and smooth chip removal, thereby reducing cutting force and cutting temperature.
Parts with high precision requirements The precision requirements of precision CNC machining parts mainly refer to the precision requirements of size, shape, position and surface, and the surface precision mainly refers to the surface roughness.
Because the CNC lathe has good rigidity, high precision in manufacturing and tool setting, and can easily and accurately perform manual compensation and automatic compensation, it can process shaft parts with high dimensional accuracy.
In addition, because the motion of the CNC lathe is realized by high-precision interpolation and servo drive, it can process parts with high shape accuracy requirements such as straightness, roundness, and cylindricity.
The CNC lathe has the function of cutting at constant linear speed, so it can not only cnc machine parts with small and uniform surface roughness, but also suitable for turning parts with different surface roughness requirements.
Generally, the machining accuracy of CNC lathes can reach 0.001mm, and the surface roughness Ra can reach 0.16μm (precision CNC lathes can reach 0.02μm).
Parts with small surface roughness values The precision CNC machining numerical control lathe has a constant linear speed cutting function, which can machine parts with small and uniform surface roughness values.
What is the reason for this phenomenon?
Sufficient hardness and strength: After many tests, engineers can find out and master the hardening conditions and working conditions of beryllium copper machining alloy precipitation and the mass characteristics of beryllium copper (this is the point that the beryllium copper alloy is based on A prelude to the application of formal products in the market); beryllium copper materials need to go through multiple cycles of tests before they are used in plastic molds to finally determine the physical properties and chemical components that meet the manufacturing and processing; the proof of theory and practice-beryllium When the hardness of copper is hrc36-42, it can reach the hardness, strength, high thermal conductivity required for tungsten die manufacturing, simple and convenient machining, long mold life, and save development and production cycle.
Good thermal conductivity: The thermal conductivity of beryllium copper material is beneficial to control the temperature of the plastic machining mold, and it is also easier to control the molding cycle, while ensuring the uniformity of the mold wall temperature; if compared with the steel mold, the molding of beryllium copper The cycle is much smaller, and the average temperature of the mold can be reduced by about 20%.
When the difference between the average ejection temperature and the average wall temperature of the mold is small (for example, when the mold parts are not easy to be cooled), use the beryllium copper mold material to cool The time can be reduced by 40%.
The mold wall temperature is only reduced by 15%; the characteristics of the above beryllium copper mold materials will bring several benefits to the mold manufacturers using this material to shorten the molding cycle and increase the productivity; the uniformity of the mold wall temperature improves the quality of the drawn products; The mold structure is simplified because the cooling pipes are reduced; the temperature of the material can be increased, thereby reducing the wall thickness of the product and reducing the cost of the product.
Long service life of the mold: Budgeting the cost of the mold and the continuity of production, the expected service life of the mold is very important for the manufacturer.
Method to solve casting porosity First analyze the reasons for the formation of stomata, and then take corresponding measures.
(1) Choose dry and clean alloy materials.
(2) Do not overheat or degas the melt under control.
(3) Reasonably choose the die casting process parameters, especially the injection speed.
The sum of the cross-sectional area of the overflow product is not less than 60% of the sum of the cross-sectional area of the gate part, otherwise the slag discharge effect will be poor.
Choose the right die casting machine Die-casting machine is the key equipment for die-casting production, and its performance objectively determines the quality of die-casting parts.
Compared with conventional CNC titanium machining processes, the outstanding advantages of turning-milling combined machining are mainly manifested in the following aspects: (1) CNC turning and milling compound processing manufacturers introduced to shorten the product manufacturing process chain and improve production efficiency.
A variety of special tools can be installed, new tool arrangement, reduce tool change time, improve processing efficiency, turning-milling composite processing can complete all or most of the machining procedures in one clamping, thus greatly shortening the product manufacturing process chain.
In this way, on the one hand, the production assistance time caused by the change of the installation card is reduced, and the manufacturing cycle and waiting time of the tooling fixture are also reduced, which can significantly improve the production efficiency.
(2) Reduce the number of clamping and improve cnc brass machining accuracy.
The reduction in the number of card loading avoids the accumulation of errors due to the conversion of positioning benchmarks.
CNC turning-milling composite processing manufacturers analyze, at the same time, most of the current turning-milling composite processing equipment has the function of online detection, which can realize the in-position detection and precision control of key data in the manufacturing process, thereby improving the processing accuracy of the product; high-strength integration The design of the machine bed improves the gravity processing ability for difficult-to-cut materials; the machine is equipped with an automatic feeding device, which can realize automatic feeding and continuous, basically realizing the assembly line operation of a single machine tool.
After the CNC machine tool is produced by the manufacturer, the machine tool has been subjected to various requirements and inspections, and only after passing the inspection, can it leave the factory.
Regarding medium and large CNC machine tools, because the machine tools are large in size and not convenient for transportation, they must be distinguished and transported to the user after they collapse before they can be used before they can be reassembled and debugged.
As for small machine tools, the float level gauge does not need to crash the machine tool during transportation, so the installation, debugging and acceptance tasks of the machine tool are relatively simple.
After the machine is transported to the user, it can be put into operation formally after simple connection, adjustment of the machine level and trial cutting, and the things required are relatively simple.
Wire connection processed by imported CNC lathes: This part of the content is mainly the main power connection of the machine tool.
Although the step of the magnetic cnc milling column level gauge is very simple, if this step is not done well, it will cause unnecessary troubles, or even Severe results will occur.
The function that the CNC lathe should have is to make preparations and the prerequisites for the reasonable selection of CNC lathes.
Meet the process requirements of typical parts The process requirements of typical parts are mainly the structural size, processing range and accuracy requirements of the parts.
The reliability of a CNC machine tool means that the machine tool runs stably for a long time without failure when it performs its functions under specified conditions.
Choose machine tools with reasonable structure, well-manufactured, and mass-produced machines.
Purchase of machine tool accessories and tools According to the analysis of CNC turning-milling composite processing manufacturers, the machine tool accessories, spare parts and their supply capacity, and cutting tools are very important to the CNC machining and turning centers that have been put into production.
When choosing a machine tool, carefully consider the compatibility of tools and accessories.
The existence of forging defects may affect the processing quality or processing quality of the subsequent processes, and some seriously affect the performance and use of the forgings, and even greatly reduce the service life of the finished parts and endanger safety.Therefore, in order to ensure or improve the quality of cold forgings, in addition to strengthening quality control in the process and taking corresponding measures to prevent the occurrence of forging defects, necessary quality inspections should also be carried out to prevent subsequent processes (such as heat treatment, surface treatment, cold processing, etc.). )
After quality inspection, remedial measures can be taken on the forgings made according to the nature of the defect and the degree of influence to use, so that it meets the technical standards or requirements for use.Therefore, in a sense, the quality inspection of forgings, on the one hand, is to check the quality of the forgings that have been made, and on the other hand, to point out the improvement direction for the forging process, so as to ensure that the quality of forgings meets the requirements of forging technical standards and meets the design Requirements on processing and use.
Appearance quality inspection mainly refers to the inspection of the geometric size, shape, surface condition and other items of the forging; the internal quality inspection mainly refers to the inspection of various items such as the chemical composition, macrostructure, microstructure and mechanical properties of the forging.
Specifically, the appearance quality inspection of forgings is to check whether the shape and geometric dimensions of the forgings meet the specifications of the drawings, whether the forgings have defects on the surface, what kind of defects are they, and what are their morphological characteristics.
The inspection content of the surface condition is generally to check whether the forging surface has surface cracks, folds, wrinkles, pits, orange peel, blisters, scars, corrosion pits, bruises, foreign objects, underfill, pits, lack of meat, Defects such as scratches.
Parts or large metal forgings should also be subjected to chemical composition analysis.
Modify tool offset value to ensure dimensional accuracyAccording to stainless steel parts machining manufacturers, when the workpiece error exceeds the workpiece tolerance due to the first tool setting error or other reasons, and the processing requirements cannot be met, the workpiece can be modified to achieve the required size by modifying the tool compensation.
The method to ensure the radial size is as follows:Absolute coordinate input methodAccording to the principle of "large reduction, small increase", modify the tool compensation at 001～004.
If the workpiece size is larger by 0.1mm when cutting the groove with the No.
2 cutting tool, and the tool compensation display at 002 is X3.8, you can enter X3.7 to reduce the No.
2 tool compensation.Relative coordinate methodAs in the above example, input U-0.1 at 002 cutter compensation, and the same effect can also be obtained.The same is true for the cnc operating of the axial size.
At this time, we can perform a semi-finishing process after roughing to eliminate the influence of screw clearance.
For the torsion surface of the outer circle and the hole, the machining allowance is considered from the diameter, so it is called the symmetry allowance (that is, the bilateral allowance), that is, the thickness of the metal layer that is actually removed is the diameter of the machining allowance.
The machining allowance of the plane is the unilateral allowance, which is the thickness of the metal layer that is actually removed The goal of leaving a machining allowance on the workpiece is to remove the machining deviation and external defects left by the previous process, such as the chilled layer, pores, and sand layer on the outside of the casting, and the oxide scale, decarburized layer, and external cracks on the outside of the forging.
, The internal stress layer and external roughness after cutting.
The size of the machining allowance has a great influence on the processing quality and production efficiency.
The machining allowance is too large, which not only increases the labor of machining, reduces the productivity, but also increases the consumption of materials, objects and electricity.
If the machining allowance is too small, it will not be able to eliminate the various shortcomings and deviations of the previous process, nor can it compensate for the clamping deviation during the processing of this process, resulting in waste products.
Compared with conventional CNC titanium machining processes, the outstanding advantages of turning-milling combined machining are mainly manifested in the following aspects: (1) CNC turning and milling compound processing manufacturers introduced to shorten the product manufacturing process chain and improve production efficiency.
A variety of special tools can be installed, new tool arrangement, reduce tool change time, improve processing efficiency, turning-milling composite processing can complete all or most of the machining procedures in one clamping, thus greatly shortening the product manufacturing process chain.
In this way, on the one hand, the production assistance time caused by the change of the installation card is reduced, and the manufacturing cycle and waiting time of the tooling fixture are also reduced, which can significantly improve the production efficiency.
(2) Reduce the number of clamping and improve cnc brass machining accuracy.
The reduction in the number of card loading avoids the accumulation of errors due to the conversion of positioning benchmarks.
CNC turning-milling composite processing manufacturers analyze, at the same time, most of the current turning-milling composite processing equipment has the function of online detection, which can realize the in-position detection and precision control of key data in the manufacturing process, thereby improving the processing accuracy of the product; high-strength integration The design of the machine bed improves the gravity processing ability for difficult-to-cut materials; the machine is equipped with an automatic feeding device, which can realize automatic feeding and continuous, basically realizing the assembly line operation of a single machine tool.
For zinc alloy die castings to be electroplated surface treatment, this link is very important.
Carbide die casting summarizes the following for you: For the selection of raw materials for zinc alloy die-casting parts, regular national standard materials must be selected for product die-casting.
The shape of die-casting parts should consider the concealing ability of electroplating, and try to reduce the impervious holes, so that it is not easy to carry the solution in the washing.
The die casting and die-casting mold manufacturing design are reasonable, so that the die-casting parts will not suffer from the shortcomings of shrinkage, pinholes and looseness.
The above-mentioned shortcomings will directly affect the adhesion of the coating.
The fine layer of 0.05-0.1mm formed during the cooling process of the Magnesium die casting is very important for electroplating.
After the CNC machine tool is produced by the manufacturer, the machine tool has been subjected to various requirements and inspections, and only after passing the inspection, can it leave the factory.
Regarding medium and large CNC machine tools, because the machine tools are large in size and not convenient for transportation, they must be distinguished and transported to the user after they collapse before they can be used before they can be reassembled and debugged.
As for small machine tools, the float level gauge does not need to crash the machine tool during transportation, so the installation, debugging and acceptance tasks of the machine tool are relatively simple.
After the machine is transported to the user, it can be put into operation formally after simple connection, adjustment of the machine level and trial cutting, and the things required are relatively simple.
Wire connection processed by imported CNC lathes: This part of the content is mainly the main power connection of the machine tool.
Although the step of the magnetic cnc milling column level gauge is very simple, if this step is not done well, it will cause unnecessary troubles, or even Severe results will occur.
It is the top thickness of the product.Advantages: The mold manufacturing cycle is short, and the development cost is relatively low compared to the stretch mold.Disadvantages: the production process is long, the product size fluctuates greatly in the process, and the labor cost is high.StretchUse material aluminum skin.
The brightness of the cutting highlights is affected by the speed of the milling drill bit.
High-gloss and high-gloss cutting are particularly used in mobile phones, such as iphone5.
In recent years, some high-end TV metal frames have adopted high-gloss milling technology, coupled with anodizing and drawing processes, making the TV as a whole full of fashion and technological sharpness.Anodizing Anodization refers to the electrochemical oxidation of sheet metals or alloys.
There are mainly the following aspects: deformation caused by internal stress of the blank, deformation caused by cutting force and cutting heat, and deformation caused by clamping force.Process measures to reduce processing distortionReduce the internal stress of the gross cultureNatural or artificial aging and vibration treatment can partially eliminate the internal stress of the blank.
On the one hand, it can grind a sharp cutting edge, and on the other hand, it can reduce cutting deformation and smooth chip removal, thereby reducing cutting force and cutting temperature.
The function that the CNC lathe should have is to make preparations and the prerequisites for the reasonable selection of CNC lathes.
Meet the process requirements of typical parts The process requirements of typical parts are mainly the structural size, processing range and accuracy requirements of the parts.
The reliability of a CNC machine tool means that the machine tool runs stably for a long time without failure when it performs its functions under specified conditions.
Choose machine tools with reasonable structure, well-manufactured, and mass-produced machines.
Purchase of machine tool accessories and tools According to the analysis of CNC turning-milling composite processing manufacturers, the machine tool accessories, spare parts and their supply capacity, and cutting tools are very important to the CNC machining and turning centers that have been put into production.
When choosing a machine tool, carefully consider the compatibility of tools and accessories.
Parts with high precision requirements The precision requirements of precision CNC machining parts mainly refer to the precision requirements of size, shape, position and surface, and the surface precision mainly refers to the surface roughness.
Because the CNC lathe has good rigidity, high precision in manufacturing and tool setting, and can easily and accurately perform manual compensation and automatic compensation, it can process shaft parts with high dimensional accuracy.
In addition, because the motion of the CNC lathe is realized by high-precision interpolation and servo drive, it can process parts with high shape accuracy requirements such as straightness, roundness, and cylindricity.
The CNC lathe has the function of cutting at constant linear speed, so it can not only cnc machine parts with small and uniform surface roughness, but also suitable for turning parts with different surface roughness requirements.
Generally, the machining accuracy of CNC lathes can reach 0.001mm, and the surface roughness Ra can reach 0.16μm (precision CNC lathes can reach 0.02μm).
Parts with small surface roughness values The precision CNC machining numerical control lathe has a constant linear speed cutting function, which can machine parts with small and uniform surface roughness values.
The existence of forging defects may affect the processing quality or processing quality of the subsequent processes, and some seriously affect the performance and use of the forgings, and even greatly reduce the service life of the finished parts and endanger safety.Therefore, in order to ensure or improve the quality of cold forgings, in addition to strengthening quality control in the process and taking corresponding measures to prevent the occurrence of forging defects, necessary quality inspections should also be carried out to prevent subsequent processes (such as heat treatment, surface treatment, cold processing, etc.). )
After quality inspection, remedial measures can be taken on the forgings made according to the nature of the defect and the degree of influence to use, so that it meets the technical standards or requirements for use.Therefore, in a sense, the quality inspection of forgings, on the one hand, is to check the quality of the forgings that have been made, and on the other hand, to point out the improvement direction for the forging process, so as to ensure that the quality of forgings meets the requirements of forging technical standards and meets the design Requirements on processing and use.
Appearance quality inspection mainly refers to the inspection of the geometric size, shape, surface condition and other items of the forging; the internal quality inspection mainly refers to the inspection of various items such as the chemical composition, macrostructure, microstructure and mechanical properties of the forging.
Specifically, the appearance quality inspection of forgings is to check whether the shape and geometric dimensions of the forgings meet the specifications of the drawings, whether the forgings have defects on the surface, what kind of defects are they, and what are their morphological characteristics.
The inspection content of the surface condition is generally to check whether the forging surface has surface cracks, folds, wrinkles, pits, orange peel, blisters, scars, corrosion pits, bruises, foreign objects, underfill, pits, lack of meat, Defects such as scratches.
Parts or large metal forgings should also be subjected to chemical composition analysis.
What is the reason for this phenomenon?
Sufficient hardness and strength: After many tests, engineers can find out and master the hardening conditions and working conditions of beryllium copper machining alloy precipitation and the mass characteristics of beryllium copper (this is the point that the beryllium copper alloy is based on A prelude to the application of formal products in the market); beryllium copper materials need to go through multiple cycles of tests before they are used in plastic molds to finally determine the physical properties and chemical components that meet the manufacturing and processing; the proof of theory and practice-beryllium When the hardness of copper is hrc36-42, it can reach the hardness, strength, high thermal conductivity required for tungsten die manufacturing, simple and convenient machining, long mold life, and save development and production cycle.
Good thermal conductivity: The thermal conductivity of beryllium copper material is beneficial to control the temperature of the plastic machining mold, and it is also easier to control the molding cycle, while ensuring the uniformity of the mold wall temperature; if compared with the steel mold, the molding of beryllium copper The cycle is much smaller, and the average temperature of the mold can be reduced by about 20%.
When the difference between the average ejection temperature and the average wall temperature of the mold is small (for example, when the mold parts are not easy to be cooled), use the beryllium copper mold material to cool The time can be reduced by 40%.
The mold wall temperature is only reduced by 15%; the characteristics of the above beryllium copper mold materials will bring several benefits to the mold manufacturers using this material to shorten the molding cycle and increase the productivity; the uniformity of the mold wall temperature improves the quality of the drawn products; The mold structure is simplified because the cooling pipes are reduced; the temperature of the material can be increased, thereby reducing the wall thickness of the product and reducing the cost of the product.
Long service life of the mold: Budgeting the cost of the mold and the continuity of production, the expected service life of the mold is very important for the manufacturer.
Modify tool offset value to ensure dimensional accuracyAccording to stainless steel parts machining manufacturers, when the workpiece error exceeds the workpiece tolerance due to the first tool setting error or other reasons, and the processing requirements cannot be met, the workpiece can be modified to achieve the required size by modifying the tool compensation.
The method to ensure the radial size is as follows:Absolute coordinate input methodAccording to the principle of "large reduction, small increase", modify the tool compensation at 001～004.
If the workpiece size is larger by 0.1mm when cutting the groove with the No.
2 cutting tool, and the tool compensation display at 002 is X3.8, you can enter X3.7 to reduce the No.
2 tool compensation.Relative coordinate methodAs in the above example, input U-0.1 at 002 cutter compensation, and the same effect can also be obtained.The same is true for the cnc operating of the axial size.
At this time, we can perform a semi-finishing process after roughing to eliminate the influence of screw clearance.
Method to solve casting porosity First analyze the reasons for the formation of stomata, and then take corresponding measures.
(1) Choose dry and clean alloy materials.
(2) Do not overheat or degas the melt under control.
(3) Reasonably choose the die casting process parameters, especially the injection speed.
The sum of the cross-sectional area of the overflow product is not less than 60% of the sum of the cross-sectional area of the gate part, otherwise the slag discharge effect will be poor.
Choose the right die casting machine Die-casting machine is the key equipment for die-casting production, and its performance objectively determines the quality of die-casting parts.
For the torsion surface of the outer circle and the hole, the machining allowance is considered from the diameter, so it is called the symmetry allowance (that is, the bilateral allowance), that is, the thickness of the metal layer that is actually removed is the diameter of the machining allowance.
The machining allowance of the plane is the unilateral allowance, which is the thickness of the metal layer that is actually removed The goal of leaving a machining allowance on the workpiece is to remove the machining deviation and external defects left by the previous process, such as the chilled layer, pores, and sand layer on the outside of the casting, and the oxide scale, decarburized layer, and external cracks on the outside of the forging.
, The internal stress layer and external roughness after cutting.
The size of the machining allowance has a great influence on the processing quality and production efficiency.
The machining allowance is too large, which not only increases the labor of machining, reduces the productivity, but also increases the consumption of materials, objects and electricity.
If the machining allowance is too small, it will not be able to eliminate the various shortcomings and deviations of the previous process, nor can it compensate for the clamping deviation during the processing of this process, resulting in waste products.