Machining process for spring plate top cover

Abstract

A machining process for a spring plate top cover (1), comprising: punching out a circular material plate (2) on a plate, and forming a positioning hole (3) in the center of the circular material plate; drawing the circular material plate in the axial direction of the positioning hole to form a first recessed cavity (4) and a second recessed cavity (5), wherein the positioning hole is located in the end face of the first recessed cavity, the edge of one end of the circular material plate forms the edge of the end portion of the second recessed cavity, and the diameter of the second recessed cavity is greater than that of the first recessed cavity; trimming the first recessed cavity and the second recessed cavity into a variable-diameter inner cavity (11) of a set size; reducing the diameter of the middle of the side wall of the second recessed cavity to the edge of the end portion; increasing the diameter of the edge of the end portion of the second recessed cavity, such that an annular recessed neck (12) is formed in the middle of the side wall of the second recessed cavity; punching out to form protruding points (14) on the end face of the first recessed cavity; and trimming the edge of the end portion of the second recessed cavity, and expanding the positioning hole to a central through hole (13) of a set size. The machining process changes the spinning forming process, and forms the spring plate top cover by means of plate punching, meeting the precision and shape requirements of the spring plate top cover, and reducing the machining difficulty.

Description

Spring disk top cover processing technology Technical Field

[0001] The present application relates to the field of cold stamping technology, for example, to a spring disk top cover processing technology. Background Art

[0002] The spring disc cover is an important mechanical transmission component, widely used in automotive transmissions, serving as a spring limiter in shock absorbers. As shown in Figures 1 and 2, the spring disc cover 1 used in new energy vehicles features a complex design. Its main body is shaped like a hat, with a variable-diameter inner cavity 11 formed inside. The large-diameter cavity is open at the end and has an annular concave neck 12 on its sidewall. The small-diameter cavity has a central through-hole 13 on the end, and a raised point 14 around the outer ring of the central through-hole 13.

[0003] The prior art manufacturing process for this spring disc cover uses spinning. However, the shortcomings of spinning are: 1) it is not suitable for large-scale production and complex surface processing, resulting in low production efficiency; 2) it requires high-precision molds, equipment, and materials, resulting in high costs; and 3) it requires highly skilled workers to meticulously operate and manage the equipment and process. Operational errors can lead to increased defective product rates, increasing costs and risks. Therefore, the prior art manufacturing process cannot meet current product molding requirements and requires further optimization.

[0004] Summary of the Invention

[0005] The present application provides a spring disk top cover processing technology, which can change the manufacturing method in the relevant technology, ensure the molding quality of the spring disk top cover, reduce production costs and improve production efficiency.

[0006] One embodiment of the present application provides a spring disk top cover processing process, including: punching out a circular material plate on a plate, and opening a positioning hole in the center of the circular material plate; drawing the circular material plate along the axial direction of the positioning hole to form a first cavity and a second cavity, the positioning hole is located on the end surface of the first cavity, the edge of one end of the circular material plate forms the end edge of the second cavity, and the diameter of the second cavity is larger than the diameter of the first cavity; trimming the first cavity and the second cavity into a variable diameter inner cavity of a set size; reducing the diameter from the middle of the side wall of the second cavity to the end edge; expanding the diameter of the end edge of the second cavity so that an annular concave neck is formed in the middle of the side wall of the second cavity; stamping a convex point on the end surface of the first cavity; and trimming the end edge of the second cavity, and expanding the positioning hole to a central through hole of a set size. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] FIG1 is a schematic structural diagram of a spring dish cover product provided in one embodiment of the present application;

[0008] FIG2 is a top view of a spring pan cover product provided in one embodiment of the present application;

[0009] FIG3 is a flow chart of a spring disc top cover manufacturing process according to an embodiment of the present application;

[0010] FIG4 is a schematic diagram of forming step S10 in the spring disc top cover processing process provided by one embodiment of the present application;

[0011] FIG5 is a schematic diagram of the first stretching step S20 in the spring disc top cover processing process provided by one embodiment of the present application;

[0012] FIG6 is a schematic diagram of the second stretching step S20 in the spring disc top cover processing process provided by one embodiment of the present application;

[0013] FIG7 is a schematic diagram of the third stretching step S20 in the spring disc top cover processing process provided by one embodiment of the present application;

[0014] FIG8 is a schematic diagram of forming step S30 in the spring disc top cover processing process according to an embodiment of the present application;

[0015] FIG9 is a top view of FIG8;

[0016] FIG10 is a schematic diagram of forming step S40 in the spring disc top cover processing process according to an embodiment of the present application;

[0017] FIG11 is a top view of FIG10;

[0018] FIG12 is a schematic diagram of forming step S50 in the spring disc top cover processing process according to an embodiment of the present application;

[0019] FIG13 is a top view of FIG12;

[0020] FIG14 is a schematic diagram of forming step S60 in the spring disc top cover processing process according to an embodiment of the present application;

[0021] FIG15 is a top view of FIG14;

[0022] FIG16 is another flow chart of a spring disk top cover processing process provided by an embodiment of the present application.

[0023] In the picture:

[0024] 1. Spring disk top cover; 11. Variable diameter inner cavity; 12. Annular concave neck; 13. Center perforation; 14. Protrusion;

[0025] 2. Circular plate; 3. Positioning hole; 4. First cavity; 5. Second cavity. DETAILED DESCRIPTION

[0026] This embodiment provides a spring disk top cover processing technology. For the spring disk top cover 1 shown in Figures 1 and 2, the process is optimized to solve the problems of high process difficulty, high cost, high defect rate and low production efficiency in the spin forming method in the related art, thereby ensuring the forming quality.

[0027] In one embodiment, as shown in FIG3 and FIG16 , the spring disc cover manufacturing process includes the following steps:

[0028] In S10 , blanking and punching: a circular plate 2 is punched out from a plate material, and a positioning hole 3 is opened in the center of the circular plate 2 , as shown in FIG4 .

[0029] In S20, stretching: the circular material plate 2 is drawn along the axial direction of the positioning hole 3 to form the first cavity 4 and the second cavity 5, the positioning hole 3 is located on the end face of the first cavity 4, the edge of one end of the circular material plate 2 forms the end edge of the second cavity 5, and the diameter of the second cavity 5 is greater than the diameter of the first cavity 4.

[0030] In one embodiment, in S20, in order to avoid excessive or inadequate stretching that affects the stretching quality, the circular sheet 2 is stretched in steps, as shown in Figures 5 to 7 for details. First, the second cavity 5 with a large diameter is stretched out, and then the first cavity 4 with a small diameter is stretched out. It is necessary to pay attention to the wall thickness at the connection between the first cavity 4 and the second cavity 5.

[0031] In S30 , shaping: the first concave cavity 4 and the second concave cavity 5 are trimmed into a variable diameter inner cavity 11 of a set size, as shown in FIG8 and FIG9 for details.

[0032] Here, the corners between the side wall and the end face of the first cavity 4 and the connection between the first cavity 4 and the second cavity 5 are mainly trimmed to ensure the shape of the variable diameter inner cavity 11.

[0033] In S40 , the opening is closed: the diameter of the side wall of the second cavity 5 from the middle to the end edge is reduced, as shown in FIG. 10 and FIG. 11 for details.

[0034] In S50 , the expansion is performed by enlarging the diameter of the end edge of the second cavity 5 , so that an annular concave neck 12 is formed in the middle of the side wall of the second cavity 5 by first contracting and then expanding. See FIG. 12 and FIG. 13 for details.

[0035] In S60 , convex points 14 are punched on the end surface of the first cavity 4 , as shown in FIG14 and FIG15 . There are four convex points 14 , which are evenly distributed around the positioning hole 3 .

[0036] In S70 , trimming and punching are performed: the end edges of the second cavity 5 are trimmed, and the positioning hole 3 is enlarged to a central through hole 13 of a set size, and finally the spring disk top cover 1 of the target shape is obtained.

[0037] Therefore, the above-mentioned spring disk top cover processing technology changes the spin forming method in the related art, and is formed by stamping a piece of plate, thereby forming a spring disk top cover 1 product with good consistency, meeting the precision requirements and shape requirements of the spring disk top cover 1, and the finished product size is stable, which reduces the processing difficulty and improves production efficiency.

Claims

1. The processing technology of the spring disc top cover, comprising: Punching out a circular blank (2) on a sheet, and opening a positioning hole (3) at the center of the circular blank (2); Drawing the circular blank (2) along the axial direction of the positioning hole (3) to form a first cavity (4) and a second cavity (5), wherein the positioning hole (3) is located on the end face of the first cavity (4), the edge of one end of the circular blank (2) forms the end edge of the second cavity (5), and the diameter of the second cavity (5) is larger than that of the first cavity (4); Trimming the first cavity (4) and the second cavity (5) into a variable-diameter inner cavity (11) with a set size; Reducing the diameter from the middle part to the end edge of the side wall of the second cavity (5); Enlarging the diameter of the end edge of the second cavity (5) so that a circumferential concave neck (12) is formed in the middle part of the side wall of the second cavity (5); Stamping convex points (14) on the end face of the first cavity (4); and Trimming the end edge of the second cavity (5) and enlarging the positioning hole (3) to a central through hole (13) with a set size.

2. The spring disc top cover processing technology according to claim 1, wherein, In the process of drawing the circular blank (2) along the axial direction of the positioning hole (3) to form the first cavity (4) and the second cavity (5), the second cavity (5) is drawn out first, and then the first cavity (4) is drawn out.

3. The spring disc top cover processing technology according to claim 1, wherein, In the process of trimming the first cavity (4) and the second cavity (5) into a variable-diameter inner cavity (11) with a set size, the fillet at the connection between the side wall and the end face of the first cavity (4) and the connection between the first cavity (4) and the second cavity (5) are trimmed.

4. The spring disc top cover processing technology according to claim 1, wherein, In the process of stamping convex points (14) on the end face of the first cavity (4), there are four convex points (14), and the four convex points (14) are evenly distributed around the positioning hole (3).

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