Automobile plate spring seat plate blank forging process and die

Abstract

According to the automobile plate spring seat plate blank forging process and die, in the first procedure, a 750 KW intermediate frequency furnace is used for heating, materials are lengthened, two pieces are produced at a time, and the efficiency is high; in the second working procedure, a 315T mechanical press is used for manufacturing blanks through two working steps including the first blank manufacturing working step and the second blank manufacturing working step; and in the third process, a 1600T electric screw press is used for pre-forging and finish-forging. Wherein the pre-forging die is locally and specially designed, materials are gathered, and the problem of material shortage in finish forging is solved; in the fourth working procedure, a 315T mechanical press is used for trimming; and in the fifth working procedure, a 315T hydraulic machine is used for shaping, two cavities are designed in a shaping die, and the two workpieces are shaped at the same time. The forging process is applied to the field of mechanical manufacturing, in particular to the forging process and die for the automobile plate spring seat plate blank, the material utilization rate is high, meanwhile, the problem that the sharp part and the corner part of the blank are lack of materials is solved, two pieces are produced at a time, and the efficiency is high.

Description

Technical Field

[0001] This invention relates to forging processes and molds, and in particular to a forging process and mold for automotive leaf spring seat plate blanks. Background Technology

[0002] The automotive leaf spring is supported on the automotive spring seat plate, which is mounted on the automotive axle housing. The automotive leaf spring, leaf spring seat, and axle housing are fixed together by U-bolts and nuts. The vehicle load, the impact force generated during driving, and the vehicle's own weight are transmitted to the leaf spring seat plate through the automotive longitudinal beams and leaf springs, and then to the rear axle by the leaf spring seat plate. Therefore, the automotive leaf spring seat plate is a key component on the automotive rear axle.

[0003] like Figure 1-3 As shown, the forging process currently used is:

[0004] First step: Heating with a 500W medium-frequency furnace;

[0005] The second step: flattening the blank using a 160T mechanical press;

[0006] The third process: pre-forging and final forging using a 1000T electric screw press;

[0007] Fourth step: Trim the edges using a 160T mechanical press;

[0008] Fifth step: Shaping with a 200T hydraulic press.

[0009] The problem with this production process is:

[0010] 1. Low material utilization rate;

[0011] 2. The blank tip 1 and corner 2 are short of material, resulting in a high scrap rate; production is only one piece at a time, resulting in low efficiency. Summary of the Invention

[0012] The purpose of this invention is to provide a forging process and mold for automotive leaf spring seat blanks to solve the problems mentioned in the background art.

[0013] To achieve the above objectives, the present invention provides the following technical solution: a cylinder bottom forging process, the first step of which involves heating with a 750KW medium frequency furnace, lengthening the material, and producing two pieces at a time, resulting in high efficiency;

[0014] The second process: using a 315T mechanical press to make blanks in two steps, including blank making step one and blank making step two.

[0015] The third process involves pre-forging and final forging using a 1600T electric screw press. The pre-forging die features a special design to concentrate material and address the material shortage issue during final forging.

[0016] The fourth step: trimming the edges using a 315T mechanical press;

[0017] The fifth step: shaping with a 315T hydraulic press. The shaping mold is designed with two cavities, and the two workpieces are shaped at the same time.

[0018] Preferably, the second blanking process consists of two steps: blanking step one and blanking step two. Blanking step one flattens the material as a whole, and blanking step two flips the material completed in blanking step one by 90 degrees and flattens it as a whole again. The third forming process consists of two steps: forming step one is pre-forging, and forming step two is final forging. The cavity design for pre-forging and final forging is on the same mold.

[0019] Preferably, steps one and two of the second blank-making process are completed on the same blank-making mold.

[0020] Preferably, the working surfaces of the upper and lower molds of the blanking mold in the second blanking process are planes.

[0021] Preferably, in the third forming process, the upper mold pre-forging cavity is designed with grooves, and the four corners of the mold are designed with latches.

[0022] Preferably, in the fifth shaping process, two cavities are designed to shape two workpieces simultaneously.

[0023] Compared with the prior art, the beneficial effects of the present invention are: the forging process of the present invention is applied in the field of mechanical manufacturing, especially the forging process and mold of automotive leaf spring seat plate blanks, which has high material utilization rate and solves the problem of material shortage at the tip and corner of the blank. It can produce two pieces at a time, which is highly efficient. Attached Figure Description

[0024] Figure 1 This is a comparative example front view of the blank of the present invention;

[0025] Figure 2 This is a left view of the blank for comparison purposes in this invention;

[0026] Figure 3 This is a lower view of the blank for comparison purposes in this invention;

[0027] Figure 4 This is a drawing of the blank-making mold for the present invention;

[0028] Figure 5 This is a cross-sectional view of the billet after the billet preparation step of this invention is completed;

[0029] Figure 6 This is a cross-sectional view of the billet after the two-step billet preparation process of this invention;

[0030] Figure 7 This is a front view of the upper forming mold and the lower forming mold of the present invention;

[0031] Figure 8 This is a top view of the forming mold of the present invention;

[0032] Figure 9 This is a bottom view of the forming mold of the present invention.

[0033] Figure 10 This is a cross-sectional view of the pre-forging cavity of the upper forming mold and the lower forming mold of the present invention.

[0034] In the diagram: 1. Tip of the blank; 2. Corner; 3. Upper blank-making mold; 4. Lower blank-making mold; 5. Upper forming mold; 6. Lower forming mold; 7. Cavity 1; 8. Cavity 2; 9. Cavity 3; 10. Cavity 4; 11. Groove; 12. Lock. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Comparative Example

[0037] The blank for the automotive leaf spring seat is made of 20# steel and is hot-forged. See the blank for details. Figure 1 Main view, Figure 2 Left view, Figure 3 Bottom view;

[0038] like Figure 1-3 As shown, the forging process currently used is:

[0039] First step: Heating with a 500W medium-frequency furnace;

[0040] The second step: flattening the blank using a 160T mechanical press;

[0041] The third process: pre-forging and final forging using a 1000T electric screw press;

[0042] Fourth step: Trim the edges using a 160T mechanical press;

[0043] Fifth step: Shaping with a 200T hydraulic press.

[0044] Example 1

[0045] See Figure 3-7 One piece of round steel is used as the raw material for two automotive leaf spring seat plates. The first heating process involves heating the round steel to 1200 degrees Celsius using a 750KW medium-frequency furnace.

[0046] The second blanking process is completed in a 315T mechanical press. The round steel bars heated to 1200 degrees Celsius are placed into the blanking mold (see blanking mold). Figure 4 Start the machine tool, and the upper mold 3 moves down with the machine tool slide to press the round steel into a shape that is flat on the top and bottom and curved on both sides. See Figure 5 The blank-making step is completed; then the material is rotated 90 degrees and placed into the mold. The operator continues to hold the clamps, gripping the middle of the material with moderate force to maintain support and prevent it from tipping over. The machine tool is restarted, and the blank-making mold moves down with the machine tool slide again, pressing the material into a cuboid shape. Figure 6 This completes the two-step process of blank preparation.

[0047] The third forming process: Install a mold in a 1600T electric screw press. Figure 7 Main view of upper forming mold 5 and lower forming mold 6. Figure 8 Top view of the lower forming mold 6 Figure 9 Top view of the forming mold (5). Figure 10 Cross-sectional view of the pre-forging cavity of the upper forming die and the lower forming die 6.

[0048] The third forming process involves designing two cavities in the forming mold. Cavity 1 (7) of the lower forming mold 6 and Cavity 3 (9) of the upper forming mold 5 complete the pre-forging step, while Cavity 2 (8) of the lower forming mold 6 and Cavity 4 (10) of the upper forming mold 5 complete the final forging step. Bridges and storage compartments are designed around the cavities, and locking latches (12) are designed at the four corners of the mold. A groove (11) is designed in the pre-forging cavity 3 (9) of the upper forming mold 5 to store material during the forging process, facilitating better filling of the final forging cavity during final forging and preventing material shortages at the tips (1) and corners (2).

[0049] During operation, the blank completed in step two of the blank-making process is placed into cavity 7 of the lower forming mold 6. The machine tool is started, and the upper forming mold 5 descends with the machine tool slide. After the upper forming mold 5 and the lower forming mold 6 close, the machine tool slide automatically returns with the upper forming mold 5. The ejector rod lifts the blank, completing the pre-forging step. The operator uses clamps to pick up the blank and places it into the final forging cavity. The machine tool is started again, and the upper forming mold 5 descends again with the machine tool slide. After the upper forming mold 5 and the lower forming mold 6 close, the machine tool slide automatically returns with the upper forming mold 5 again. The ejector rod lifts the blank, and the operator uses clamps to pick up the blank, completing the final forging step. At this point, the forming process is completed.

[0050] The fourth trimming process: The trimming die is installed in a 315T mechanical press. The billet completed in the final forging step is clamped and placed into the trimming die. The machine tool is started, and the upper trimming die moves down with the machine tool slide to cut off the flash. The upper trimming die moves back automatically with the machine tool slide, and two workpieces are taken out in sequence to complete the trimming process.

[0051] The fifth shaping process: The shaping mold has two cavities, shaping two workpieces simultaneously. Locking latches are designed at the four corners of the mold. The shaping mold is installed in a 315T hydraulic press. During operation, the two workpieces with trimmed edges are placed into the two shaping cavities respectively. The machine tool is started, and the upper shaping mold descends with the machine tool slide. After the upper and lower shaping molds close, the trimming upper mold automatically returns with the machine tool slide, sequentially removing the two shaped workpieces. This completes all forging processes for the automotive leaf spring seat blank.

Claims

1. A forging process for automotive leaf spring seat plate blanks, characterized in that: S1: The first step is the heating process, which uses a 750KW medium frequency furnace. S2: The second step is the blank-making process, which is completed on a 315T mechanical press; S3: The third step is the forming process, which is completed on a 1600T electric screw press; S4: The fourth step is the edge trimming process, which is completed on a 315T mechanical press. S5: The fifth step is the shaping process, which is completed on a 315T hydraulic press.

2. The forging process for an automotive leaf spring seat plate blank according to claim 1, characterized in that: The second blanking process consists of two steps: blanking step one and blanking step two. Blanking step one is to flatten the material as a whole, and blanking step two is to flip the material completed in blanking step one by 90 degrees and flatten it as a whole again. The third forming process consists of two steps: the first step is pre-forging, and the second step is final forging. The cavities for pre-forging and final forging are designed on the same mold.

3. A forging die for an automotive leaf spring seat blank, applicable to any one of claims 1-2, characterized in that: The first and second steps of the second blank-making process are completed on the same set of blank-making molds.

4. A forging die for an automotive leaf spring seat blank, applicable to any one of claims 1-2, characterized in that: The working surfaces of the upper and lower molds in the second blank-making process are flat.

5. A forging die for an automotive leaf spring seat blank, applicable to any one of claims 1-2, characterized in that: In the third forming process, the upper mold pre-forging cavity is designed with grooves, and the four corners of the mold are designed with latches.

6. A forging die for an automotive leaf spring seat blank, applicable to any one of claims 1-2, characterized in that: The fifth shaping process involves designing two cavities and shaping two workpieces simultaneously.

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