A forming process of a side beam cover plate of a railway vehicle bogie

Abstract

The application discloses a forming process of a bogie side beam cover plate of a railway vehicle, and mainly comprises the following steps: S1, selecting a single-column hydraulic machine as a profiling equipment of the bogie side beam cover plate, wherein the tonnage of the single-column hydraulic machine is greater than or equal to 600 tons; and S2, profiling and bending the bogie side beam cover plate in a single-point bending mode. The forming process of the application adopts a single single-column hydraulic machine to replace the free bending forming of a bending machine by forced bending forming in a single-point bending mode, thereby eliminating the problem of uneven bottom surface of the bending line. The single-column hydraulic machine solves the problems of large investment and low flexibility of the overall forming of a die, and the profiling rebound can be adjusted by the angle of the die, the pressure and the pressure maintaining time are adjusted during profiling to finely adjust and accurately form, and the subsequent secondary adjustment process is cancelled.

Description

Technical Field

[0001] This invention relates to the field of side beam cover plates for railway vehicle bogies, and more particularly to a molding process for side beam cover plates for railway vehicle bogies. Background Technology

[0002] The side beam cover plate of a rail vehicle bogie is a key component of the rail vehicle bogie. (See also...) Figure 1 and Figure 2 As shown, Figure 1 and Figure 2 The structure of the side beam cover plate of a railway vehicle bogie is shown. Existing technologies for processing side beam cover plates generally employ two methods: integral die forming and multi-point forming using a bending machine. These existing technologies have the following problems: integral die forming requires significant investment, has low flexibility, and a long cycle time. Furthermore, due to fluctuations in die structure and material properties, the springback at the four corners is difficult to control, resulting in large adjustments. For some asymmetrical shapes with side bends on both sides of the curve, bending forming uses a small die multi-point bending method to form large arc parts, which is inefficient. Because bending is a free bending process, the material at both ends of the bend deforms and warps freely in the thickness direction, leading to unevenness at the bottom of the bend.

[0003] Therefore, based on the above-mentioned technical problems, those skilled in the art urgently need to develop a molding process for the side beam cover plate of the bogie of a rail vehicle. Summary of the Invention

[0004] The purpose of this invention is to provide a forming process for the side beam cover plate of the bogie of a rail vehicle, which solves the problems of large investment and low flexibility in the overall forming of the mold; solves the problems of difficult control of springback and large adjustment amount in one-time forming of the mold; and solves the problems of uneven bottom of the bending line and low efficiency in the free bending forming of the bending machine.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] The present invention discloses a molding process for a side beam cover plate of a railway vehicle bogie, which mainly includes the following steps:

[0007] S1. Select a single-column hydraulic press as the forming equipment for the bogie side beam cover plate. The tonnage of the single-column hydraulic press shall be greater than or equal to 600 tons.

[0008] S2. The bogie side beam cover plate is bent into shape by single-point bending.

[0009] Furthermore, the bogie side beam cover plate has four bent-formed portions;

[0010] The steps for bending the bogie side beam cover plate using the single-column hydraulic press are as follows:

[0011] S201. First, the two bending forming parts at the ends of the bogie side beam cover plate are bent and formed.

[0012] S202. Next, the two bending forming parts in the middle of the bogie side beam cover plate are bent.

[0013] Furthermore, the single-column hydraulic press includes:

[0014] A frame having a bending forming space; and

[0015] An upper slider worktable and an upper mold are integrated on the upper part of the frame. The bogie side beam cover plate profile is placed in the bending and forming space. The upper slider worktable and the upper mold are used to bend and form the four bending and forming parts of the bogie side beam cover plate profile to form the bogie side beam cover plate.

[0016] Furthermore, the frame has a lower mold at the position where it mates with the upper slider worktable;

[0017] The lower mold is equipped with a drag bar clamping structure powered by a hydraulic press air cushion at the middle position, which clamps the side beam cover plate together with the upper mold.

[0018] Furthermore, the single-column hydraulic press is equipped with an adjustable positioning mechanism;

[0019] The bending line of the bogie side beam cover plate is kept in position relative to the frame by the adjustable positioning mechanism.

[0020] Furthermore, a protrusion is formed in the middle of the bogie side beam cover plate, two protrusions are spaced apart, and a notch is formed between the two protrusions;

[0021] The adjustable positioning mechanism has a notch positioning part that cooperates with the notch. The notch positioning part is embedded in the notch between the two protrusions to ensure that the bending line position of the bogie side beam cover plate corresponds to the mold forming working position.

[0022] Furthermore, the adjustable positioning mechanism includes:

[0023] Positioning mechanism main body;

[0024] An adjustment portion formed at one end of the main body of the positioning mechanism, the adjustment portion having a plurality of positioning holes spaced apart along its length, the main body of the positioning mechanism being connected to the frame through any one of the positioning holes; and

[0025] The notch positioning portion is formed at the other end of the main body of the positioning mechanism.

[0026] The forming process for the side beam cover plate of a rail vehicle bogie provided by the present invention, as described above, has the following beneficial effects:

[0027] The forming process of this invention uses a single-column hydraulic press for forced bending forming at a single point, replacing the free bending forming of a bending machine, thus eliminating the problem of uneven bottom surface of the bending line. The use of a single-column hydraulic press solves the problems of large overall mold forming investment and low flexibility. Furthermore, the springback during forming can be compensated for by the mold angle, and the applied pressure and holding time can be adjusted during forming for fine-tuning and precise forming, eliminating the need for subsequent secondary adjustment processes.

[0028] The molding process of this invention corrects the side bends by means of a bending line angle rotation compensation method, and the rotation compensation angle is accomplished by changing the positioning. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0030] Figure 1 This is the front view of the bogie side beam cover plate that needs to be machined;

[0031] Figure 2 This is a top view of the bogie side beam cover plate that needs to be machined;

[0032] Figure 3 This is a front view of a single-column hydraulic press used in the forming process of a side beam cover plate for a rail vehicle bogie, as disclosed in an embodiment of the present invention.

[0033] Figure 4 This is a schematic diagram of the mold structure of a single-column hydraulic press for a molding process of a side beam cover plate of a rail vehicle bogie, as disclosed in an embodiment of the present invention.

[0034] Figure 5 This invention discloses a forming process diagram of a rail vehicle bogie side beam cover plate, showing the processing state of the profile and the working state of the hydraulic press.

[0035] Figure 6 This is a schematic diagram of the adjustable positioning mechanism and the matching structure of the profile in the forming process of the side beam cover plate of the bogie of a rail vehicle disclosed in an embodiment of the present invention.

[0036] Figure 7 This is a schematic diagram of the adjustable positioning mechanism for the forming process of the side beam cover plate of a rail vehicle bogie disclosed in an embodiment of the present invention.

[0037] Figure 8 This is a schematic diagram of the adjustable positioning mechanism and the notch positioning of the profile in the forming process of the side beam cover plate of the bogie of a rail vehicle disclosed in an embodiment of the present invention.

[0038] Figure 9 This is a schematic diagram of the first step of profile bending in the forming process of a side beam cover plate of a rail vehicle bogie disclosed in an embodiment of the present invention.

[0039] Figure 10 This is a schematic diagram of the second step of profile bending in the forming process of the side beam cover plate of a rail vehicle bogie disclosed in an embodiment of the present invention.

[0040] Figure 11 This is a schematic diagram of the third step of the profile bending process in the forming process of the side beam cover plate of a rail vehicle bogie disclosed in an embodiment of the present invention.

[0041] Figure 12 This is a schematic diagram of the fourth step of the profile bending process in the forming process of the side beam cover plate of a rail vehicle bogie disclosed in an embodiment of the present invention.

[0042] Figure 13 This is a schematic diagram of the asymmetrical parts on both sides of the bending line in the forming process of the side beam cover plate of a rail vehicle bogie disclosed in an embodiment of the present invention.

[0043] Figure 14 This is a schematic diagram of the bending line rotation of an asymmetrical part in the forming process of a side beam cover plate of a rail vehicle bogie disclosed in an embodiment of the present invention.

[0044] Figure 15 This is a schematic diagram of the positioning plate after the bending line is rotated, which is part of the forming process of the side beam cover plate of the bogie of a rail vehicle disclosed in an embodiment of the present invention.

[0045] Explanation of reference numerals in the attached figures:

[0046] 10. Bogie side beam cover plate;

[0047] 1001. Protrusion; 1002. Notch;

[0048] 1. Single-column hydraulic press; 2. Adjustable positioning mechanism;

[0049] 101. Frame; 102. Upper slider worktable and upper mold; 103. Lower mold; 104. Trailing rod ejector clamping structure;

[0050] 201. Main body of positioning mechanism; 202. Adjustment part; 203. Positioning hole; 204. Notch positioning part. Detailed Implementation

[0051] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0052] See Figures 3 to 12 As shown;

[0053] This embodiment describes a molding process for a side beam cover plate of a rail vehicle bogie. The molding process mainly includes the following steps:

[0054] S1. Select a single-column hydraulic press 1 as the forming equipment for the bogie side beam cover plate 10. The tonnage of the single-column hydraulic press 1 is greater than or equal to 600 tons.

[0055] S2. The bogie side beam cover plate 10 is bent into shape by single-point bending.

[0056] Specifically, the forming process of the bogie side beam cover plate 10 in this embodiment solves the problems of poor springback control, low quality, and large adjustment amount in the overall forming of the mold by using a single-angle bending and pressing method. The pressing equipment adopts a single-column hydraulic press with a tonnage of 600 tons or more. By using a large-tonnage single-column hydraulic press for pressing, the three-sided operating space solves the problems of poor operating controls and inconvenient operation in the existing bending machine.

[0057] The single-column hydraulic press 1 in this embodiment has functions such as pressure regulation, adjustable and controllable stroke, pressure holding function, adjustable pressure holding time, and adjustable forming speed.

[0058] Preferably, the bogie side beam cover plate 10 in this embodiment has four bent-formed portions;

[0059] The steps for bending the side beam cover plates 10 of the bogie using a single-column hydraulic press are as follows:

[0060] S201. First, the two bending forming parts at the ends of the bogie side beam cover plate 10 are bent.

[0061] S202. Next, the two bending forming parts in the middle of the bogie side beam cover plate 10 are bent.

[0062] The single-column hydraulic press 1 includes:

[0063] Frame 101, frame 101 having a bending forming space; and

[0064] The upper slider worktable and upper mold 102 are integrated on the upper part of the frame 101. The bogie side beam cover plate profile is placed in the bending forming space, and the four bending forming parts of the bogie side beam cover plate profile are bent and formed by the upper slider worktable and upper mold 102 to form the bogie side beam cover plate 10.

[0065] Secondly, in this embodiment, the frame 101 has a lower mold 103 at the position where it cooperates with the upper slider worktable and the upper mold 102;

[0066] A hydraulic press air cushion-powered drag bar clamping structure 104 is provided in the middle of the lower mold 103.

[0067] In this embodiment, the mold uses a single-angle punch and die to form the material by forced bending. The lower mold is equipped with a hydraulic press air cushion-powered drag bar clamping structure 104, which, together with the upper mold 102, clamps the side beam cover plate throughout its entire stroke during bending to prevent material slippage and deviation.

[0068] More preferably, the single-column hydraulic press 1 of this embodiment is equipped with an adjustable positioning mechanism 2;

[0069] The bogie side beam cover plate 10 maintains the relative position of the bending line with the frame 101 through the adjustable positioning mechanism 2.

[0070] Among them, a protrusion 1001 is formed in the middle of the bogie side beam cover plate 10, two protrusions 1001 are spaced apart, and a notch 1002 is formed between the two protrusions 1001.

[0071] The adjustable positioning mechanism 2 has a notch positioning part 204 that cooperates with the notch 1002. The notch positioning part 204 is embedded in the notch 1002 between the two protrusions 1001 to ensure that the bending line position of the bogie side beam cover plate 10 corresponds to the mold forming working position.

[0072] The adjustable positioning mechanism 2 in this embodiment includes:

[0073] Positioning mechanism main body 201;

[0074] An adjustment section 202 is formed at one end of the main body 201 of the positioning mechanism. The adjustment section 202 has a plurality of positioning holes 203 spaced apart along its length. The main body 201 of the positioning mechanism is connected to the frame 101 through any one of the positioning holes 203.

[0075] A notch positioning part 204 is formed at the other end of the main body part 201 of the positioning mechanism.

[0076] The adjustable positioning mechanism 2 of this embodiment is provided with an adjustment part 202 having multiple positioning holes 203, wherein the positioning holes 203 are elongated holes. The adjustable positioning mechanism 2 can adjust its position through any one of the positioning holes 203 to adapt to the positioning of the bogie side beam cover plate 10 at different positions. This ensures the consistency of the reference during the forming process.

[0077] In this embodiment, the bending of the two ends of the profile is first performed, and then the two bending sections in the middle of the profile are bent. Figure 13 In the area shown in the diagram, the curve is asymmetrical on both sides, resulting in a lateral bend after bending. This lateral bend can be corrected by a small rotation compensation method based on the angle of the curve. Figure 14 As shown. The rotation compensation angle for the curved line needs to be obtained through experimental methods. After determining the compensation angle, it is then adjusted by replacing... Figure 15 The positioning plate shown ensures consistency in mass production.

[0078] The forming process for the side beam cover plate of a rail vehicle bogie provided by the present invention, as described above, has the following beneficial effects:

[0079] The forming process of this invention uses a single-column hydraulic press for forced bending forming at a single point, replacing the free bending forming of a bending machine, thus eliminating the problem of uneven bottom surface of the bending line. The use of a single-column hydraulic press solves the problems of large overall mold forming investment and low flexibility. Furthermore, the springback during forming can be compensated for by the mold angle, and the applied pressure and holding time can be adjusted during forming for fine-tuning and precise forming, eliminating the need for subsequent secondary adjustment processes.

[0080] The molding process of this invention corrects the side bends by means of a bending line angle rotation compensation method. The rotation compensation angle is confirmed by experiments and is accomplished by changing the positioning.

[0081] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A forming process for a side beam cover plate of a railway vehicle bogie, characterized in that, The molding process includes the following steps: S1. Select a single-column hydraulic press (1) as the forming equipment for the bogie side beam cover plate (10), and the tonnage of the single-column hydraulic press (1) is greater than or equal to 600 tons. S2. The bogie side beam cover plate (10) is bent into shape by single-point bending. The single-column hydraulic press (1) is equipped with an adjustable positioning mechanism (2); the bending line of the bogie side beam cover plate (10) is maintained relative to the frame (101) of the single-column hydraulic press (1) through the adjustable positioning mechanism (2); The bogie side beam cover plate (10) has a protrusion (1001) protruding from the middle position, and two protrusions (1001) are spaced apart, with a notch (1002) formed between the two protrusions (1001). The adjustable positioning mechanism (2) has a notch positioning part (204) that cooperates with the notch (1002). The notch positioning part (204) is embedded in the notch (1002) between the two protrusions (1001) to ensure that the bending line position of the bogie side beam cover plate (10) corresponds to the mold forming working position.

2. The forming process of the side beam cover plate of a railway vehicle bogie according to claim 1, characterized in that, The bogie side beam cover plate (10) has four bent and formed parts; The steps of bending the bogie side beam cover plate (10) by the single-column hydraulic press (1) are as follows: S201. First, the two bending forming parts at the ends of the bogie side beam cover plate (10) are bent; S202. Next, the two bending forming parts in the middle of the bogie side beam cover plate (10) are bent.

3. The forming process of a side beam cover plate for a railway vehicle bogie according to claim 1 or 2, characterized in that, The single-column hydraulic press (1) includes: A frame (101) having a bending forming space; and The upper slider worktable and upper mold (102) are integrated on the upper part of the frame (101). The profile of the bogie side beam cover plate (10) is placed in the bending and forming space. The upper slider worktable and upper mold (102) are used to bend and form the four bending and forming parts of the bogie side beam cover plate (10) profile to form the bogie side beam cover plate (10).

4. The forming process of the side beam cover plate of a railway vehicle bogie according to claim 3, characterized in that, The frame (101) has a lower mold (103) at the position where it cooperates with the upper slider worktable and the upper mold (102). The lower mold (103) is provided with a drag bar ejector clamping structure (104) powered by a hydraulic press air cushion at the middle position.

5. The forming process of the side beam cover plate of a railway vehicle bogie according to claim 1, characterized in that, The adjustable positioning mechanism (2) includes: Positioning mechanism main body (201); An adjustment section (202) is formed at one end of the main body (201) of the positioning mechanism. The adjustment section (202) has a plurality of positioning holes (203) spaced apart along its length. The main body (201) of the positioning mechanism is connected to the frame (101) through any one of the positioning holes (203). The notch positioning part (204) is formed at the other end of the main body part (201) of the positioning mechanism.

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