Closed hot extrusion forging processing method for universal joint duplex fork

Abstract

The invention discloses a universal joint duplex fork closed hot extrusion forging machining method. Workpiece forging comprises the specific steps that reverse extrusion treatment is conducted on a forged piece coarse material; the forging coarse material is heated through an intermediate frequency furnace, rapid cooling annealing treatment is carried out after heating, and the step is repeated for multiple times, so that the pre-sheared excess material is cracked near the interior of the excess material block, a plurality of holes are formed between the excess material block and the forging coarse material, the connection strength is reduced, and the forging coarse material is annealed firstly and then subjected to upsetting treatment. Performing shot blasting and phosphorus saponification treatment to obtain a pre-forged piece; the pre-forged piece is subjected to precision forging forming, a closed forging technology is adopted for a precision forging die, flash-free forging is conducted, and vent holes are designed in the precision forging die; the surface of the workpiece subjected to normalizing treatment is subjected to sand blasting treatment, and the workpiece subjected to sand blasting treatment is subjected to rust-proof treatment, so that the rejection rate of products is reduced, the qualification rate of the products is improved, and the energy consumption is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of universal joint double yoke forging, in particular to a method for closed hot extrusion forging of universal joint double yoke. Background technique [0002] Some existing construction machinery and vehicle steering drive axles usually use a single universal joint as the steering drive device. When the transmission deflection angle is large, the speed and torque of this drive device will have large fluctuations, resulting in a large fluctuation in the transmission process. It is impossible to realize the constant speed transmission between the driving shaft and the driven shaft, and it is easy to cause vibration and damage the machine parts. The problems mentioned above are mostly in the form of double forks at present. The assembly of the existing double forks of universal joints is generally to assemble the universal joints with the spline shaft forks first, and then assemble the double forks with the u...

AI Technical Summary

Problems solved by technology

[0002] Some existing construction machinery and vehicle steering drive axles usually use a single universal joint as the steering drive device. When the transmission deflection angle is large, the speed and torque of this drive device will have large fluctuations, resulting in a large fluctuation in the transmission process. It is impossible to realize the constant speed transmission between the driving shaft and the driven shaft, and it is easy to cause vibration and damage the machine parts. The problems mentioned above are mostly in the form of double forks at present. The assembly of the existing double forks of universal joints is generally to assemble the universal joints with the spline shaft forks first, and then assemble the double forks with the universal joints. Before assembling joints, spline shaft forks and double joint forks, the bearings of the outer ring of the universal joint should be removed, and the cross shaft, spline shaft fork, and outer ring should be pressed in sequence by a press-fitting machine to complete the assembly of the universal joint and the drive shaft

[0003] During the forging process, the double fork blank of the universal joint needs to be produced by a forging press with a large tonnage. The heated round blank is pressed through the upper and lower molds to obtain the blank, but it causes a large tonnage. The investment in forging press equipment and power consumption are large, the utilization rate of materials is low, and the machining allowance of the ear hole for installing the cross shaft in the later stage is particularly large, which is difficult to meet the requirements of forging enterprises for energy saving, cost reduction, and efficiency improvement , the forging process for the universal joint double fork mainly includes raw material blanking, heating, forging, cutting, cooling and normalizing furnace normalization. During forging, the finished product obtained during the current universal joint double fork forging There are always residual material blocks on the outside, which will not only cause waste of materials, but also need to cut and polish the residual material blocks after the molding is completed, which increases the workload of the staff virtually, making the flange type The overall manufacturing efficiency of the universal joint sliding sleeve is low. In the forging process of the existing technology, there are problems such as low utilization rate of forging materials, high product rejection rate, and large energy consumption. Therefore, we propose a universal joint double fork Closed hot extrusion forging processing method