A method for manufacturing a copper-based friction plate with a core plate having overall hardness and high spline precision

Abstract

Provided is a manufacturing method for a copper-based friction plate provided with a core plate with overall hardness and high spline precision. The manufacturing method for the copper-based friction plate comprises the following steps that (a) materials are prepared for a friction layer; (b) material mixing and compacting are carried out, wherein the materials are mixed in a V-shaped material mixer according to the formula and compacted into a blank needed for the friction plate; (c) the blank and the core plate are sintered under the condition that no spline is machined, and the core plate and the blank of the friction plate are alloyed and adhered firmly; (d) surface grinding is conducted, wherein grinding is conducted on the surface of the friction layer of the blank of the sintered friction plate; (e) overall strengthening treatment is conducted on the friction plate, wherein the blank of the friction plate is heated to 840-860 DEG C in a well-type heat treatment furnace and subjected to decarbonization protection; (f) stacked mounting tempering treatment is conducted on the friction plate, wherein the processed friction plate is put in a bell jar type pressurizing furnace and subjected to furnace feeding tempering treatment, and the hardness of the core plate is controlled at HRC30-38; (g) splines of the core plate with the friction layer are machined, and an oil groove is machined; (h) friction plate tooth shot blasting treatment is conducted; and (i) the surface of the friction layer is accurately grounded, and a finished product is made out.

Description

technical field [0001] The invention relates to a manufacturing method of a copper-based friction plate with a core plate of the friction plate having overall hardness and high spline precision, which is used for manufacturing a friction plate of a transmission box of a high-load and heavy-duty vehicle, and belongs to the technical field of copper-based friction plate manufacturing. Background technique [0002] The friction plate is one of the important parts in various mechanical equipment. They use friction to work. To work reliably, the friction plate must have a sufficiently high and stable friction coefficient, wear resistance, heat resistance, and torque transmission. ability. In many heavy-duty off-highway vehicle transmission gearboxes, the friction material is required to have a high thermal load. Copper-based high-carbon formula wet-type copper-based friction plates are used as transmission components. Due to the large load and harsh working conditions, the core p...

AI Technical Summary

Problems solved by technology

The pressing and firing process increases the bonding strength between the friction layer and the steel core plate, but since the sintering process of the high-carbon copper-based friction plate is carried out at a high temperature of 750°C to 830°C, the core plate of the produced friction plate is in an annealed state, resulting in core The strength of the plate material is low, and the ability to withstand high load and fatigue impact is poor. Moreover, the traditional friction plate manufacturing process is to process the splines on the core plate before sintering. , so that the degree of engagement between the friction plate and the mating hub becomes worse when the friction plate is working, and the force is uneven, which can easily cause the fracture of the core plate of the friction plate under high load

[0004] A manufacturing method is disclosed in the Chinese patent ZL200710157157.5. Although this method can solve the problems of the strength and processing accuracy of the core plate of the copper-based friction plate, it uses YSML resin glue impregnation and the friction layer and the steel core plate are bonded with resin. Connected, there are problems such as poor high temperature resistance, not suitable for use in high load conditions

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