A transmission steering arm forging process

Abstract

A transmission steering arm forging process, comprising the following steps: (1) blanking; (2) heating; (3) billet bending; (4) pre- and final forging; (5) trimming; (6) correction ; (7) shot blasting; (8) normalizing. The invention has reasonable design, compact working procedure and convenient operation. Each working procedure basically has quality inspection, which greatly improves the material utilization rate and forming rate of the forging, reduces the amount of subsequent machining, and reduces the production cost.

Description

technical field [0001] The invention belongs to the technical field of forging, and in particular relates to a forging process of a transmission steering arm. Background technique [0002] There is a transmission steering arm in engineering vehicles that has a stepped, slender structure, and the forgings of the transmission steering arm (such as figure 1 with figure 2 As shown) the overall cross-sectional area contrast is relatively large, especially the cross-sectional area difference between the two ends of the transmission steering arm forging is relatively large, and there is a connecting rib 8 between the large end 6 (right end) and the small end 7 (left end), the transmission steering arm forging There is a height difference of 77.5mm between the connecting rib 8 between the big end 6 and the small end 7. Due to the large difference in cross-section at both ends of the forging and the fact that it is not on the same straight line, it is difficult to form, the materia...

AI Technical Summary

Problems solved by technology

[0003] ①The overall cross-sectional area of ​​the transmission steering arm is quite different. In order to satisfy the forming of the largest cross-sectional area of ​​the transmission steering arm, it is necessary to select a billet with a relatively large diameter. The billet is directly put into the cavity for forging without making a billet. The impact of the equipment will be unreliable, causing the size of the thickness direction to be out of tolerance in places with small cross-sectional areas

[0004] Due to the low guide precision of the hammer forging equipment, the impact nature and the stroke of the hammer head during work are not fixed, it all depends on the strength of the worker's stepping on the hammer, and the dimensional accuracy of the forging is not high. In order to ensure the processing size of the forging, the machining allowance of the hammer forging is only The edge is about 8mm, the subsequent machining wastes more materials, and the consumption of metal processing tools is relatively large

[0005] ② Use hammer forging equipment to gradually form multiple blows in a single cavity. Although the hammer head strikes faster, the deformation of each blow is very small. A single forging needs to be struck more than ten times to form, and the production efficiency is low;

[0007] ③The burr of the transmission steering arm after forging from the large blank is relatively large, and the circumference is uneven. High scrap rate for forgings

[0009] 1) There is a large difference in cross-sectional area at both ends of the transmission steering arm. When selecting the raw material specifications for forming the big end 6, there will be too many blanks at the small end 7, and the small end will not move during die forging. The small end after die forging It is thicker than the burr than the design, and the temperature of the burr on the periphery of the die forging will be reduced by about 100°C. Due to the influence of the burr during die forging, the small end may not be reliable. The actual forging will be about 2mm thicker, resulting in the size Very bad

When selecting the raw material specifications for small-end forming, the blank required for large-end forming is insufficient, and the forgings are not filled or seriously short of material, resulting in the scrapping of forgings and increasing the cost of the production process

[0010] 2) There is a height difference between the large end and the small end of the transmission steering arm. ①When the cylindrical blank 1 is placed in the forging cavity 4 between the upper die 2 and the lower die 3, the blank 1 is placed obliquely on the die On the die forging lower die 3 of forging cavity 4 (as image 3 As shown), the lower end and middle of the blank 1 are in contact with the die forging lower die 3, and there is no positioning in the front and rear directions, and the position consistency of the blank 1 placed by the worker is poor; The lower die forging upper die 2 moves downward, and when the die forging upper die 2 contacts the blank 1, the blank 1 will move back and forth or swing left and right; considering the above factors, a relatively large blank 1 will be selected when blanking, making it difficult to form the transmission steering arm Large, low forging material utilization rate, low forging forming rate

[0011] 3) The slope of the connecting rib between the large end and the small end of the transmission steering arm is 40.5°, and the slope tolerance is ±1°. Due to the inconsistency between the thickness of the forging and the trimming temperature, deformation occurs at the height difference of the forging after trimming , causing forgings to be scrapped in severe cases

Due to the particularity of the structure of the transmission steering arm, a large machining allowance is used in the design of the forging, and the required parts are subsequently machined into the required parts. The machining wastes more materials and the machining efficiency is low.

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