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A Dissimilar Metal Composite Piston Forging Technology

A dissimilar metal and forging technology, applied in the field of solid-state hot die forging, can solve the problems of weak push-pull strength of internal threads, achieve good machining performance, reduce product costs, and save copper alloys.

Active Publication Date: 2016-10-05
QINHAN PRECISION IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing high-voltage electric pistons are all made of copper alloy, and the push-pull strength of the internal thread at the end of the rod is relatively weak; and the current material price of copper alloy is 7-8 times higher than that of steel, and the tensile strength of steel is higher than that of steel. More than twice that of copper alloys

Method used

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  • A Dissimilar Metal Composite Piston Forging Technology
  • A Dissimilar Metal Composite Piston Forging Technology

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The forging process of copper alloy and steel composite piston specifically includes the following steps:

[0031] a. Material preparation: unloading on the band sawing machine, sawing the copper alloy and steel into the required length and weight;

[0032] b. Machining: the sawed steel bar material such as figure 1 Surface processing is performed as shown, specifically, the sawn steel material is firstly turned to the light at one end, and then turned into a process groove, the flat end surface of the inverted head is determined to have a total length and turned into an outer circle, and the end with the groove is kept clean;

[0033] c. Forging preparation: match the number of sawn copper alloy materials and machined steel parts one-to-one, put the copper alloy materials into the box furnace and place them neatly, and control the heating temperature to 760°C; forge the piston The special convex and concave molds are respectively installed on the upper and lower workt...

Embodiment 2

[0039] The forging process of the aluminum alloy and steel composite piston, the specific steps are equal to the first embodiment, only the heating temperature of the aluminum alloy material in the box furnace is adjusted to 470 ° C, the mold is preheated to 300 ° C, the forging process The steps are consistent with those in Example 1. The composite piston head is made of non-ferrous metal aluminum alloy, and the piston rod is made of 45 steel. The tensile strength of aluminum alloy is 345, and the Brinell hardness is lower than that of copper alloy; the tensile strength of steel is 593, and the Brinell hardness is HB229. From the comparison of the two sets of mechanical property data of the above two materials, it can be clearly seen that the piston rod made of steel is better than the aluminum alloy in terms of strength. Since the mechanical properties of the forged composite piston, the tensile strength is not less than 345, Therefore, the mechanical performance and reliab...

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Abstract

The invention discloses a dissimilar metal composite piston forging process, which relates to the technical field of solid-state thermal die forging. Dissimilar metals are cut according to their respective required lengths and weights; the piston rod is processed into a piston by leaving a surplus of metal material The shape of the rod, and the processed piston rod material is placed in the die on the press table; the heated piston head is placed on the piston rod material in the die with metal material, and the press is operated to squeeze the punch. Forming of dissimilar metals in the concave die; the press ejects the forged composite piston, takes the forged composite piston out of the concave die and air-cools, and completes the forging process; according to the use requirements of different parts of the piston, different metal materials are used , and the performance and reliability of the composite piston after forging can meet the operating requirements of high-voltage switch electrical components. Also disclosed is a mold used for extrusion forging when implementing the dissimilar metal composite piston forging process.

Description

technical field [0001] The invention relates to the technical field of solid-state hot die forging, in particular to a forging process of dissimilar metals and a composite piston made thereof. Background technique [0002] The existing high-voltage electric pistons are all made of copper alloy, and the push-pull strength of the internal thread at the end of the rod is relatively weak; and the current material price of copper alloy is 7-8 times higher than that of steel, and the tensile strength of steel is higher than that of steel. More than twice that of copper alloys. In view of the above factors, in order to improve the tensile and compressive strength of the overall piston rod and the tail thread and reduce the cost of the product, the piston rod can be changed to steel. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a dissimilar metal composite piston and its forging process. Metals of different materials...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/02B21J13/02F16J1/01
Inventor 辛选荣刘新城史志欣
Owner QINHAN PRECISION IND CO LTD
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