Bushing framework machining process

Abstract

A bushing framework machining process, comprising: selecting a precision drawn tube section (2); punching a recess (11) on an edge of an end of the precision drawn tube section; on a curved circumferential surface of the precision drawn tube section, punching four openings (21) which are distributed at intervals in a circle; dividing the four openings into two symmetrical groups, breaking a tube wall between the two openings of the same group such that the two openings of the same group are in communication to form a window (12), retaining a tube wall between two openings of different groups to form partition ribs (13); applying pressure to two partition ribs to obtain a framework semi-finished product (3); and finely trimming and shaping the framework semi-finished product. In the described machining process, the welding forming method in the related art is changed, and a single precision drawn tube section for punching and forming is employed, thereby forming a bushing framework product having good consistency, meeting the precision and modeling requirements of a bushing framework, improving production efficiency, and resulting in a lightweight product.

Description

Bushing skeleton processing technology Technical Field

[0001] The present application relates to the field of cold stamping technology, for example, to a bushing skeleton processing technology. Background Art

[0002] Bushing frames are important mechanical transmission components, widely used in automotive transmissions. As shown in Figure 1, the bushing frame 1 used in new energy vehicles has a complex structural design. Its main body is cylindrical, with grooves 11 formed on the edges of both ends. Two windows 12 are defined in the sidewalls of the main body, with a partition rib 13 formed between the two windows 12. The partition rib 13 has an inward-curving shape.

[0003] The manufacturing process of this bushing skeleton is to connect two ring parts through two ribs. The disadvantage is that the ring parts and ribs need to be pre-formed and then welded, and the welds need to be surface treated later. The process is cumbersome, the production efficiency is low, the labor cost is high, and the quality of the finished product is heavy. Therefore, the manufacturing process in the relevant technology cannot meet the current product molding requirements and needs further optimization.

[0004] Summary of the Invention

[0005] The present application provides a bushing skeleton processing technology, which can change the manufacturing method in the relevant technology, ensure the molding quality of the bushing skeleton, and improve production efficiency.

[0006] An embodiment of the present application provides a bushing skeleton processing process, comprising the following steps: selecting a precision-drawn tube segment; punching out grooves on the edges of both ends of the precision-drawn tube segment; punching out four openings circumferentially spaced apart on the circumferential curved surface of the precision-drawn tube segment; dividing the four openings into two symmetrical groups, punching out the tube wall between two openings in the same group so that the two openings in the same group are connected to form a window, and retaining the tube wall between two openings in different groups to form partition ribs; applying pressure to the two partition ribs to obtain a semi-finished skeleton product; and fine-tuning and shaping the semi-finished skeleton product. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] FIG1 is a schematic structural diagram of a bushing skeleton product in the related art;

[0008] FIG2 is a flow chart of a bushing skeleton processing process provided by an embodiment of the present application;

[0009] FIG3 is a forming schematic diagram of step S20 in the bushing skeleton processing process provided by one embodiment of the present application;

[0010] FIG4 is a schematic diagram of the first step of punching in S30 in the bushing skeleton processing process according to an embodiment of the present application;

[0011] FIG5 is a side view of FIG4;

[0012] FIG6 is a schematic diagram of the second step of punching in step S30 of the bushing skeleton processing process provided in one embodiment of the present application;

[0013] FIG7 is a side view of FIG6;

[0014] FIG8 is a schematic diagram of forming step S40 in the bushing skeleton processing process according to an embodiment of the present application;

[0015] FIG9 is a side view of FIG8;

[0016] FIG10 is a schematic diagram of forming step S50 in the bushing skeleton processing process according to an embodiment of the present application;

[0017] FIG11 is a side view of FIG10;

[0018] FIG12 is a top view of FIG10;

[0019] FIG13 is another flow chart of the bushing skeleton processing process provided in one embodiment of the present application.

[0020] In the picture:

[0021] 1. Bushing skeleton; 11. Groove; 12. Window; 13. Partition rib; 2. Precision drawn tube section; 21. Opening; 22. Outward expansion stop; 3. Skeleton semi-finished product. DETAILED DESCRIPTION

[0022] This embodiment provides a bushing skeleton processing technology, which optimizes the process for the bushing skeleton 1 in the related art shown in Figure 1 to solve the problems of complex process, low production efficiency and poor product quality in the welding forming method in the related art, and ensure the forming quality.

[0023] In one embodiment, as shown in FIG2 and FIG13 , the bushing skeleton processing process includes the following steps:

[0024] In S10 , material preparation is performed: a precision drawn tube segment 2 is selected according to the size of the target bushing skeleton 1 .

[0025] In S20 , a side punch is performed once: grooves 11 are punched out on the edges of both ends of the precision drawn tube segment 2 , as shown in FIG3 .

[0026] The requirement here is that two grooves 11 are provided on the edge of each end of the precision drawn tube segment 2, and finally the position of the groove 11 on the bushing skeleton 1 and the position of the partition rib 13 are on the same axial straight line.

[0027] In S30 , secondary side punching is performed: four openings 21 are punched out on the circumferential surface of the precision-drawn tube segment 2 at intervals in the circumferential direction.

[0028] The four openings 21 here are distributed in a cross shape on the cross section of the precision drawn tube material section 2, so the four openings 21 can be punched and formed in two steps. The first step is to punch out two centrally symmetrical openings 21, as shown in Figures 4 and 5 for details; the second step is to punch out the remaining two openings 21, as shown in Figures 6 and 7 for details.

[0029] In S40, three side punches are performed: the four openings 21 are divided into two symmetrical groups, the tube wall between the two openings 21 in the same group is punched to connect the two openings 21 in the same group to form a window 12, and the tube wall between the two openings 21 in different groups is retained to form a partition rib 13, see Figures 8 and 9 for details.

[0030] In one embodiment, in S30, corresponding outward-flared stoppers 22 are formed on the edges of the two openings 21 in the same group. When performing three side punches, the tube wall between the two openings 21 in the same group is punched along the outward-flared stoppers 22 to ensure punching accuracy and ensure the molding quality of the window 12.

[0031] In S50 , bending is performed by applying pressure to the two partition bars 13 to obtain a skeleton semi-finished product 3 , as shown in FIG. 10 to FIG. 12 .

[0032] The partition ribs 13 are recessed relative to the circumferential surface of the precision-drawn tube segment 2 , so that the axial dimension of the skeleton semi-finished product 3 is smaller than the axial dimension of the precision-drawn tube segment 2 .

[0033] In S60, shaping: fine trimming and shaping of the skeleton semi-finished product 3.

[0034] In one embodiment, it is necessary to round both ends of the skeleton semi-finished product 3 and level the middle of the partition rib 13 to finally obtain the bushing skeleton 1 of the target shape.

[0035] Therefore, the above-mentioned bushing skeleton processing technology changes the welding forming method in the relevant technology, and adopts a precision drawn tube material segment 2 for stamping and forming, thereby forming a bushing skeleton 1 product with good consistency, meeting the precision requirements and shape requirements of the bushing skeleton 1, improving production efficiency, and light product quality.

Claims

1. Bushing skeleton processing technology, including: Selecting a precision drawn tube section (2); Punching grooves (11) on the edges of both ends of the precision drawn tube section (2); Punching four openings (21) with circumferentially spaced distribution on the circumferential curved surface of the precision drawn tube section (2); Dividing the four openings (21) into two symmetric groups, punching off the tube wall between the two openings (21) in the same group to make the two openings (21) in the same group communicate to form a window (12), and retaining the tube wall between the two openings (21) in different groups to form a partition rib (13); Applying pressure to the two partition ribs (13) to obtain a semi-finished skeleton (3); and Finely trimming and shaping the semi-finished skeleton (3).

2. The bushing skeleton processing technology according to claim 1, wherein, In the step of punching four openings (21) with circumferentially spaced distribution on the circumferential curved surface of the precision drawn tube section (2), the four openings (21) are punched and formed in two steps. First, punch two openings (21) that are centrosymmetric, and then punch the remaining two openings (21).

3. The bushing skeleton processing technology according to claim 1, wherein, When dividing the four openings (21) into two symmetric groups and punching off the tube wall between the two openings (21) in the same group, there are corresponding outward-expanded stop mouths (22) formed on the edges of the two openings (21) in the same group, and punch off the tube wall between the two openings (21) in the same group along the outward-expanded stop mouths (22).

4. The bushing skeleton processing technology according to claim 1, wherein, There are two grooves (11) respectively arranged on the edges of both ends of the precision drawn tube section (2), and the positions of the grooves (11) are on the same axial straight line as the positions of the partition ribs (13).

5. The bushing skeleton processing technology according to claim 1, wherein, During the process of applying pressure to the two partition ribs (13), the partition ribs (13) are recessed relative to the circumferential curved surface of the precision drawn tube section (2), so that the axial dimension of the semi-finished skeleton (3) is smaller than the axial dimension of the precision drawn tube section (2).

6. The bushing skeleton processing technology according to claim 1, wherein, During the process of finely trimming and shaping the semi-finished skeleton (3), round the two ends of the semi-finished skeleton (3), and flatten the middle part of the partition ribs (13).

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