Product picture description:
Material category: copper precision machining
Surface treatment: nickel plating
Detailed description of product processing:
This product is made of automotive precision parts and is made of copper materials. The product structure is relatively simple. The use of CNC lathe processing can meet the product's drawing requirements.
In terms of material processing, it can not only deal with ordinary conventional materials, such as easy-turning iron processing, copper processing, aluminum processing, stainless steel processing, etc., but also can calmly deal with special materials, such as die steel, titanium alloy and other super-hard materials. Materials can be processed.
Difficulties faced by precision mold processing
Stamping dies have a strong momentum of development in the product fields of new energy, automation equipment, medical equipment, aerospace, energy saving and emission reduction. Among the exhibitors at the Guangzhou International Mould Fair this year, precision multi-station progressive moulds occupies the mainstream product status. Not only is the number of exhibitors large and the variety coverage is large, but the quality and technical content of the moulds are also much higher than that of previous mould exhibitions.
Luo Baihui, secretary general of the International Mould Association, said that in recent years, the overall technical level of advanced precision stamping dies has improved rapidly, and the performance indicators such as mold technology, manufacturing accuracy, service life and manufacturing cycle have been significantly improved, and a considerable part of the high-end The overall level of high-quality molds has reached or approached the level of similar international molds. For example, the air conditioner fin progressive die produced by Gree Daikin Mould Co., Ltd. has a service life of up to 500 million strokes, and its production scale and technological development are in a domestic leading position. The developed 0.4mm pitch high-precision miniature connector progressive die has a manufacturing accuracy of 0.5, and the smallest punch of 0.13mm is directly ground to a mirror surface, which ensures that the smallest pin of the part is 0.17mm, and the bending accuracy is 0.01mm and S-shaped. High precision requirements such as bending. The motor iron core automatic lamination progressive die produced by a Shenzhen motor mold company has a service life of more than 150 million strokes. The technical level and lamination technology are close to the advanced level of similar foreign molds. The developed 0.5m diameter large iron chip progressive die produced on a 400-ton high-speed punch, 0.88m square iron chip large precision block composite die with 90 rotations, and 1.2m diameter stator and rotor piece extra large precision punching die, etc. The production level and capacity are in a leading position in the country.
Specialization has greatly improved the innovation ability of stamping die companies, and the technical level has developed in the direction of specialization, precision, excellence and strength, and many new high-tech precision mold processing technologies have emerged. It is reported that the step-by-step precision progressive die for air-conditioning fins, which is urgently to be exhibited this time, can meet the rapid switching production of five types of sheet shapes, has certain flexible production characteristics, and the level of the die is equivalent to the international advanced level. The 37-station progressive die for the lead frame exhibited has one die with three rows. 48 inner and outer lead legs are punched within 1212mm, with a minimum spacing of 0.12mm, and the flatness of the product is within 0.01mm. Its high-speed batch production performance and life are equivalent to the international advanced level, and it has obtained structural innovation patents.
Many domestic precision stamping dies have a smaller and smaller gap with the international advanced level in terms of life and main performance. The overall level of some precision stamping dies is equivalent to the international advanced level, not only completely replacing imports, but also a considerable part of the mold is exported to the United States , Japan and other industrialized developed countries and regions. The overall level of precision dies in my country is close to the international advanced level, and a considerable number of precision dies are going abroad and participating in international competition.
Introduction to the mechanical properties of steel
1. Yield point
When the steel or sample is stretched, when the stress exceeds the elastic limit, even if the stress no longer increases, the steel or the sample still continues to undergo significant plastic deformation. This phenomenon is called yielding, and the minimum stress value when the yielding phenomenon occurs is Is the yield point. Suppose Ps is the external force at the yield point s, Fo is the cross-sectional area of the sample, then the yield point σs = Ps/Fo (MPa), MPa is called MPa equal to N (Newton)/mm2, (MPa=106Pa , Pa: Pascal=N/m2).
2. Yield strength
The yield point of some metal materials is extremely inconspicuous and it is difficult to measure. Therefore, in order to measure the yield characteristics of the material, it is stipulated that the stress when permanent residual plastic deformation is equal to a certain value (usually 0.2% of the original length) is called the condition Yield strength or yield strength σ0.2 for short.
3. Tensile strength
The maximum stress value reached by the material during the stretching process from the beginning to when it breaks. It indicates the ability of steel to resist fracture. Corresponding to the tensile strength are compressive strength, bending strength and so on.
Let Pb be the maximum tensile force reached before the material is broken, and Fo is the cross-sectional area of the sample, then the tensile strength σb = Pb/Fo (MPa).
"After the material is broken, the percentage of the plastic elongation length to the original sample length is called the elongation or elongation.
5. Buck-strength ratio
The ratio of the yield point (yield strength) of the steel to the tensile strength is called the yield ratio. The larger the yield ratio, the higher the reliability of structural parts. Generally, the yield ratio of carbon steel is 0.6-0.65, and that of low-alloy structural steel is 0.65-0.75 and alloy structural steel is 0.84-0.86.
Hardness refers to the ability of a material to resist the pressing of hard objects into its surface. It is one of the important performance indicators of metal materials. Generally, the higher the hardness, the better the wear resistance. Commonly used hardness indicators are Brinell hardness, Rockwell hardness and Vickers hardness.
⑴ Brinell hardness (HB)
Press a hardened steel ball of a certain size (usually 10mm in diameter) into the surface of the material with a certain load (usually 3000kg) and keep it for a period of time. After the load is removed, the ratio of the load to the indentation area is the Brinell hardness value ( HB), the unit is kilogram force/mm2 (N/mm2).
⑵Rockwell hardness (HR)
When HB>450 or the sample is too small, the Brinell hardness test cannot be used and the Rockwell hardness measurement can be used instead. It uses a diamond cone with a support angle of 120° or a steel ball with a diameter of 1.59 and 3.18mm, which is pressed into the surface of the material to be tested under a certain load, and the hardness of the material is obtained from the depth of the indentation. According to the hardness of the test material, it can be expressed in three different scales:
HRA: It is the hardness obtained with a 60kg load and a diamond cone indenter, used for extremely hard materials (such as cemented carbide, etc.).
HRB: It is the hardness obtained by using a 100kg load and a hardened steel ball with a diameter of 1.58mm. It is used for materials with lower hardness (such as annealed steel, cast iron, etc.).
HRC: It is the hardness obtained with a load of 150kg and a diamond cone indenter, and is used for materials with high hardness (such as hardened steel, etc.).
⑶ Vickers hardness (HV)
The diamond square cone indenter with a load of 120kg or less and a support angle of 136° is pressed into the surface of the material, and the surface area of the material indentation pit is divided by the load value, which is the Vickers hardness value (HV)