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Mold surface finishing in need of improvement measures have?
by：CSSSLD
2021-01-23
Mold surface finishing in need of improvement measures: one of the mold surface finishing not good problem solving, and mould processing labor intensity big, become one of changshu mould processing bottleneck reason.
Particularly large metal hardness, die casting die for final assembly process.
Our country is still grinding and polishing by hand is given priority to, not only quality is not stable, the cycle is long, and the workers work environment is poor, restrict the casting mold to a higher level of development in China.
For some complex mold cavity surface finishing, slit the traditional machining method has been insufficient, must use other technical measures, such as electrochemical or electrochemical mechanical finishing machining technology.
With the development of science and technology, all kinds of mold processing technology demand is higher and higher.
Improve the quality of mold polishing speed make the mould manufacturing technology reached the world advanced level, has become an urgent important topic.
mold surface finishing technology, mainly can be divided into two parts, namely traditional finishing technology of non-traditional finishing technologies. The traditional finishing technology developed mainly manual polishing now mechanical finish machining; Non-traditional finishing mainly includes electrochemical polishing, electrolytic polishing, chemical polishing, electrochemical mechanical finishing machining, ultrasonic machining, the magnetic rheological polishing, laser polishing technology and edm polishing, etc. Here are the main processing methods tools are introduced. Mold processing and how to reduce the defects: 1, the reasonable choice and dressing grinding wheel, using white corundum grinding wheel is better, it is the performance of hard and brittle, and easy to produce the new cutting edge, so the cutting force is small, the grinding heat is small, use medium granularity on granularity, such as 46 ~ 60 mesh is better, on the grinding wheel hardness by using soft and soft ZR1, ZR2 and R1, R2) , that is, coarse granularity, low hardness of the grinding wheel, good self excitation can reduce heat cutting.
of selecting the appropriate fine grinding wheel is very important, in view of the condition of the die steel with high vanadium high molybdenum, choose GD is suitable for single crystal corundum grinding wheel, when processing hard alloy, high quenching hardness of materials, the priority using organic binder diamond grinding wheel, since the organic binder grinding wheel grinding, grinding the workpiece roughness of Ra0. 2 microns, in recent years, with the application of new materials, CBN ( Cubic boron nitride) Grinding wheel shows very good processing effect, both inside and outside the CNC forming grinder, jig grinding machine, CNC grinding machine on finishing, is better than other kinds of grinding wheel.
in the grinding, attention should be paid to timely dressing grinding wheel, keep the wheel sharp, when grinding wheel after passivation, the surface smooth, extrusion, surface caused by burns, strength decrease. 2, the rational use of cooling lubricant, cooling, washing, lubrication should play the role of the big three, keep clean, cooling and lubrication to control the grinding heat within the scope of the permit, to prevent thermal deformation. Improve the cooling conditions when grinding, such as by oil immersion wheel or inner cooling grinding wheel and other measures. The cutting fluid into the center of the grinding wheel, cutting fluid can be directly into the grinding zone, give play to the role of effective cooling, prevent the workpiece surface burn. 3, after heat treatment of quenching stress reduced to a minimum, because quenching stress, reticular tissue under the action of the grinding force, carbide organization transformation to make the workpiece to produce crack. For high precision mould in order to eliminate the residual stress of the grinding, the grinding should be done after aging treatment of metal in order to improve the toughness at low temperature. 4, eliminate grinding stress can also will die in 260 ~ 315 ℃ in the salt bath soak 1.
5 min, and then in 30 ℃ oil cooling, so can reduce 1 HRC hardness, residual stress reduced by 40% ~ 65%. 5, for the size tolerance in 0. 01
mm within the precision mould precision grinding attention should be paid to the influence of environment temperature, requires constant temperature grinding. The calculation shows that
300 mm long steel, temperature 3 ℃, the material has 10. The change of around 8 microns, ( 10. 8 = 1. 2 * 3 * 3, each 100 mm 1 deformation. 2μm/℃) , the machining process are required to fully consider the influence of this factor. 6, the electrolytic grinding processing, improve the mould manufacturing precision and surface quality. Electrolytic grinding, grinding wheel shaving oxide film: instead of grinding, metal and small grinding force, grinding heat is small, won't produce the phenomenon such as grinding burrs, cracks, burns, surface roughness can be better than Ra0 commonly. 16μm; In addition, the grinding wheel wear small, such as grinding hard alloy, silicon carbide grinding wheel wear is about for grinding of cemented carbide of the weight of 400% ~ 600%, electrolytic grinding, grinding wheel wear is only hard alloy grinding in addition amount of 50% ~ 100%. 7, reasonably choosing grinding dosage, use small radial feeding method of fine grinding and fine grinding. Such as appropriate to reduce the radial feeding and grinding wheel speed, increase the axial feeding, reduce grinding wheel and workpiece contact area, cooling condition is improved, so as to effectively control the mold surface temperature increase.
die standard parts is an important part of the mould
die standard parts is an important part of the mould, in recent years has made rapid progress in manufacturing technology level, independent research and development ability of enterprises is also a must to strengthen and improve, for the development of China's mold industry to provide a good protection and support. Many small die standard parts enterprises, also brought their own of standard products in guangdong. Low technical content proportion of mold standard parts is on the high side. At present various standard enterprise has a certain capacity for independent development, but the technical content is not high, the structure of advanced mold standard parts are basically refer to foreign standard production. In order to meet the requirement of mould market in changshu, mold standard parts manufacturers, at home and abroad have different degrees of increase the intensity of the new product development, strive to improve the benefit of enterprises with new products and occupy more market share.
mold surface finishing technology, mainly can be divided into two parts, namely traditional finishing technology of non-traditional finishing technologies. The traditional finishing technology developed mainly manual polishing now mechanical finish machining; Non-traditional finishing mainly includes electrochemical polishing, electrolytic polishing, chemical polishing, electrochemical mechanical finishing machining, ultrasonic machining, the magnetic rheological polishing, laser polishing technology and edm polishing, etc. Here are the main processing methods tools are introduced. Mold processing and how to reduce the defects: 1, the reasonable choice and dressing grinding wheel, using white corundum grinding wheel is better, it is the performance of hard and brittle, and easy to produce the new cutting edge, so the cutting force is small, the grinding heat is small, use medium granularity on granularity, such as 46 ~ 60 mesh is better, on the grinding wheel hardness by using soft and soft ZR1, ZR2 and R1, R2) , that is, coarse granularity, low hardness of the grinding wheel, good self excitation can reduce heat cutting.
of selecting the appropriate fine grinding wheel is very important, in view of the condition of the die steel with high vanadium high molybdenum, choose GD is suitable for single crystal corundum grinding wheel, when processing hard alloy, high quenching hardness of materials, the priority using organic binder diamond grinding wheel, since the organic binder grinding wheel grinding, grinding the workpiece roughness of Ra0. 2 microns, in recent years, with the application of new materials, CBN ( Cubic boron nitride) Grinding wheel shows very good processing effect, both inside and outside the CNC forming grinder, jig grinding machine, CNC grinding machine on finishing, is better than other kinds of grinding wheel.
in the grinding, attention should be paid to timely dressing grinding wheel, keep the wheel sharp, when grinding wheel after passivation, the surface smooth, extrusion, surface caused by burns, strength decrease. 2, the rational use of cooling lubricant, cooling, washing, lubrication should play the role of the big three, keep clean, cooling and lubrication to control the grinding heat within the scope of the permit, to prevent thermal deformation. Improve the cooling conditions when grinding, such as by oil immersion wheel or inner cooling grinding wheel and other measures. The cutting fluid into the center of the grinding wheel, cutting fluid can be directly into the grinding zone, give play to the role of effective cooling, prevent the workpiece surface burn. 3, after heat treatment of quenching stress reduced to a minimum, because quenching stress, reticular tissue under the action of the grinding force, carbide organization transformation to make the workpiece to produce crack. For high precision mould in order to eliminate the residual stress of the grinding, the grinding should be done after aging treatment of metal in order to improve the toughness at low temperature. 4, eliminate grinding stress can also will die in 260 ~ 315 ℃ in the salt bath soak 1.
5 min, and then in 30 ℃ oil cooling, so can reduce 1 HRC hardness, residual stress reduced by 40% ~ 65%. 5, for the size tolerance in 0. 01
mm within the precision mould precision grinding attention should be paid to the influence of environment temperature, requires constant temperature grinding. The calculation shows that
300 mm long steel, temperature 3 ℃, the material has 10. The change of around 8 microns, ( 10. 8 = 1. 2 * 3 * 3, each 100 mm 1 deformation. 2μm/℃) , the machining process are required to fully consider the influence of this factor. 6, the electrolytic grinding processing, improve the mould manufacturing precision and surface quality. Electrolytic grinding, grinding wheel shaving oxide film: instead of grinding, metal and small grinding force, grinding heat is small, won't produce the phenomenon such as grinding burrs, cracks, burns, surface roughness can be better than Ra0 commonly. 16μm; In addition, the grinding wheel wear small, such as grinding hard alloy, silicon carbide grinding wheel wear is about for grinding of cemented carbide of the weight of 400% ~ 600%, electrolytic grinding, grinding wheel wear is only hard alloy grinding in addition amount of 50% ~ 100%. 7, reasonably choosing grinding dosage, use small radial feeding method of fine grinding and fine grinding. Such as appropriate to reduce the radial feeding and grinding wheel speed, increase the axial feeding, reduce grinding wheel and workpiece contact area, cooling condition is improved, so as to effectively control the mold surface temperature increase.
die standard parts is an important part of the mould
die standard parts is an important part of the mould, in recent years has made rapid progress in manufacturing technology level, independent research and development ability of enterprises is also a must to strengthen and improve, for the development of China's mold industry to provide a good protection and support. Many small die standard parts enterprises, also brought their own of standard products in guangdong. Low technical content proportion of mold standard parts is on the high side. At present various standard enterprise has a certain capacity for independent development, but the technical content is not high, the structure of advanced mold standard parts are basically refer to foreign standard production. In order to meet the requirement of mould market in changshu, mold standard parts manufacturers, at home and abroad have different degrees of increase the intensity of the new product development, strive to improve the benefit of enterprises with new products and occupy more market share.
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