Rolling piece capable of blocking and cutting off inner extension of crack
By setting a blocking line at the cut position of the roll forming part, the problem of internal extension of the cut crack is solved, thus achieving product safety and cost-effectiveness.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LINGYUN INDAL CORP
- Filing Date
- 2025-05-08
- Publication Date
- 2026-04-17
AI Technical Summary
When cutting existing roll-formed parts, the inner cavity of the product is not supported, which causes tearing at the rounded corners of the vertical ribs. The cracks may extend inward, affecting product quality and safety, and increasing production costs.
Add a blocking line at the cut position of the roll forming part. The blocking line is an inner groove shape and is set at the corner where the crossbeam and the side wall connect. The depth is 0.3~0.8t and the width is appropriate. It is processed by stamping die, laser printing or cutting tool to prevent the extension of the crack inside.
It effectively blocks the internal extension of the cut crack, avoids product scrap, reduces production costs, and ensures the safety and pass rate of body parts.
Smart Images
Figure CN224135664U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of roll pressing and cutting of automobile parts, and particularly relates to a roll pressing part capable of blocking the inward extension of cutting cracks. Background Technique
[0002] Roll forming is a commonly used process in automobile production. Roll forming (abbreviated as RF), also known as cold bending, roll pressing, roll bending, roller, etc. in Chinese, and roll forming in English, is a technology that obtains various open, closed, and wide-width deformed cross-section metal profiles by continuously rolling and bending metal sheets or strips. The roll pressing part after roll forming is cut into product parts by a cutting mechanism, and cutting is the last process.
[0003] In the existing roll pressing part cutting technology, it is necessary to cut a large number of product parts with complex cross-sections such as day-shaped and B-shaped high-strength steel. When the moving knife cuts, there is no support in the inner cavity of the product, and there are ribs inside the product. It only relies on the unilateral punching of the moving knife without forming a shearing with the static knife. As a result, cutting and tearing will occur at the rounded corners of the middle vertical ribs. This cutting crack is fatal to the quality of the product parts. Because if the cutting crack is not blocked, when the vehicle is loaded and the vehicle vibrates and bumps during driving, there is a risk that the crack will extend inward. In this way, the safety of the vehicle body cannot be guaranteed. Such product parts will be directly scrapped. The problem of high-strength steel cutting and tearing greatly affects the qualified rate of products and increases the production cost. Summary of the Invention
[0004] The utility model provides a roll pressing part capable of blocking the inward extension of cutting cracks, and a blocking line is added at the cutting position of the roll pressing part to solve the problem of the inward extension of the tearing generated during cutting.
[0005] The utility model solves the above technical problems through the following technical solutions.
[0006] A roll pressing part capable of blocking the inward extension of cutting cracks, the roll pressing part is a day-shaped or B-shaped formed by rolling a steel strip, the cross-section of the roll pressing part is day-shaped or B-shaped, a cross beam is arranged in the middle of the roll pressing part, a first process cutting hole, a second process cutting hole and a third process cutting hole are respectively arranged in the middle of the left side wall, the middle of the cross beam and the middle of the right side wall of the roll pressing part, and the first process cutting hole, the second process cutting hole and the third process cutting hole are at the same horizontal position; a blocking line is also provided, the blocking line is a concave groove shape, and the blocking line is located at the corner where the cross beam is connected to the upper side wall and the lower side wall, and is symmetrically distributed on the front and rear sides of the second process cutting hole.
[0007] For the above roll pressing part capable of blocking the inward extension of cutting cracks, the thickness of the plate of the roll pressing part is t, and the depth d of the blocking line is 0.3 - 0.8t.
[0008] The above-mentioned roll forming part that can block the extension of the cut crack has a first process cutting hole width that is 1-2 mm wider than the cutter head width, and the spacing between two adjacent blocking lines, the width of the first process cutting hole, the width of the second process cutting hole and the width of the third process cutting hole are the same.
[0009] The aforementioned roll forming component that can block the extension of the cutting crack is manufactured by one of the following processes: stamping with a die, laser printing, or cutting with a tool.
[0010] The aforementioned roll forming component that can block the extension of the cut crack, wherein the blocking line is a point-discontinuous straight line, a continuous straight line, a symmetrical U-shape, or a closed ring formed along the inner wall of the cavity of the roll forming component.
[0011] Compared to existing technologies, this invention is primarily applied to the production of bumpers, door sills, or A / B pillars on roller pressing lines. By adding blocking lines on both sides of the cutting position on the roller-pressed part, it ensures that cracks generated during the cutting process are stopped at the blocking lines, or that the tearing continues laterally along the blocking lines without extending further into the part. This solves the problem of cracks extending into the part after cutting and tearing, thus achieving the effect of preventing tearing. This patented technology has extremely high practical value, avoiding product scrap caused by cutting and tearing problems and reducing product production costs. The structure is simple and the implementation process is convenient.
[0012] Compared with existing technologies, this invention, by setting a blocking line to prevent tearing within the inner layer, avoids product scrapping caused by cutting and tearing, thus reducing production costs and ensuring the safety of vehicle body parts. It has extremely high applicability and practical value in mass production processes. The blocking line can be set in various shapes to address the cutting problems of different types of products. This patented technology can be implemented through various processes such as molding, laser cutting, and scribing, offering high applicability, compatibility with various production line equipment, and low implementation costs. It is easy to industrialize and implement in batches. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of this utility model;
[0014] Figure 2 This is a schematic diagram of the end face structure of the product component of this utility model;
[0015] Figure 3 The shapes of the blocking lines of this utility model are: a. point-discontinuous straight lines, b. continuous straight lines, c. symmetrical U-shapes, and d. closed loops.
[0016] Figure 4 It is the depth of the blocking line on the end face of this utility model.
[0017] The markings in the attached diagram represent: 1. Roller, 2. Crossbeam, 3. First process cut-off hole, 4. Second process cut-off hole, 5. Third process cut-off hole, 6. Left side wall, 7. Right side wall, 8. Upper side wall, 9. Lower side wall, 10. Blocking line. Detailed Implementation
[0018] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model.
[0019] like Figures 1 to 3 As shown, the roller pressing component 1 in this utility model is formed by rolling steel strip. The cross-section of the roller pressing component 1 is either H-shaped or B-shaped. A crossbeam 2 is provided in the middle of the roller pressing component 1. A first process cutting hole 3, a second process cutting hole 4, and a third process cutting hole 5 are respectively provided in the middle of the left side wall 6 of the roller pressing component 1, the middle of the crossbeam 2, and the middle of the right side wall 7 of the roller pressing component 1. The first process cutting hole 3, the second process cutting hole 4, and the third process cutting hole 5 are at the same horizontal position. A blocking line 10 is also provided. The blocking line 10 is a concave groove shape. The blocking line 10 is located at the corner where the crossbeam 2 connects to the upper side wall 8 and the lower side wall 9, and is symmetrically distributed on the front and rear sides of the second process cutting hole 4.
[0020] According to the required length, the positions of the process cutting holes are set. The cutter enters from the first process cutting hole 3, passes through the second process cutting hole 4 and the third process cutting hole 5 in sequence, and cuts off the roll forming 1 to form the product part. In order to make the thickness of the sheet material of the roll forming 1 t, the depth d of the blocking line 10 is 0.3~0.8t. The blocking line is set to this depth so as not to affect the roll forming process; at the same time, it can ensure that the blocking line effectively prevents the sheet material from tearing during cutting.
[0021] The width of the first process cutting hole (3) is 1-2 mm greater than the width of the cutting head, which facilitates the entry of the cutting head into the first process cutting hole. The spacing between the two adjacent blocking lines, the width of the first process cutting hole (3), the width of the second process cutting hole (4), and the width of the third process cutting hole (5) are consistent. This ensures that the cutting area remains between the two blocking lines during the cutting process.
[0022] The processing method of the blocking line 10 is as follows:
[0023] Stamping die forming: The blocking line is directly pressed onto the strip. Using this processing method, the blocking line 10 can be generated quickly and can be integrated into the entire production line without affecting the cycle time.
[0024] Laser printing: A blocking line 10 is printed on the strip using laser printing. The depth of the blocking line 10 can be adjusted by directly adjusting the power, and the shape and position of the blocking line 10 can also be adjusted by the laser equipment.
[0025] Cutting with a cutting tool: A cutting tool or cutting head cuts the material to form a blocking line 10. Cutting with a cutting tool has the characteristics of adjustable depth and position.
[0026] The blocking line 10 is formed by stamping with a stamping die, laser printing, or cutting with a tool. It has high applicability and can be matched with various production line equipment.
[0027] The blocking line 10 can be a point-discontinuous straight line, a continuous straight line, a symmetrical U-shape, or a closed ring formed along the inner wall of the cavity of the roll forming part 1. By setting various blocking lines 10, feasible design support can be provided for different cross-sectional product parts, and complex products can be processed and produced. This helps to solve different types of tearing problems in products.
[0028] Working principle: When tearing begins during the cutting process, or as the crack extends into the product part during actual use, when the tear reaches the stop line, the interior of the stop line is relatively thin. The crack will then tear along the weak stop line, or break directly at the stop line. In this way, the tear is directly blocked at the stop line. This effectively solves the tearing problem during cutting.
[0029] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A roll forming component capable of blocking the inward extension of cut fracture lines, characterized in that, The roller pressing part (1) is formed by rolling steel strip. The cross-section of the roller pressing part (1) is H-shaped or B-shaped. A crossbeam (2) is provided in the middle of the roller pressing part (1). A first process cutting hole (3), a second process cutting hole (4) and a third process cutting hole (5) are respectively provided in the middle of the left side wall (6) of the roller pressing part (1), the middle of the crossbeam (2) and the middle of the right side wall (7) of the roller pressing part (1). The first process cutting hole (3), the second process cutting hole (4) and the third process cutting hole (5) are in the same horizontal position. A blocking line (10) is also provided. The blocking line (10) is a concave groove shape. The blocking line (10) is located at the corner where the crossbeam (2) connects with the upper side wall (8) and the lower side wall (9) and is symmetrically distributed on the front and rear sides of the second process cutting hole (4).
2. The roll according to claim 1, wherein The thickness of the plate of the roller pressing part (1) is t, and the depth of the blocking line (10) is d=0.3~0.8t.
3. The roll of claim 2, wherein the roll is configured to block the propagation of a cut in the roll. The processing technology of the blocking line (10) is one of stamping, laser printing or cutting.
4. The roll according to claim 3, wherein The blocking line (10) is a point-discontinuous straight line, a continuous straight line, a U-shape, or a closed ring formed along the inner wall of the cavity of the roller (1).
5. The roll of claim 4, wherein the roll is configured to break in a manner that prevents propagation of a cut in the roll. The width of the first process cutting hole (3) is 1-2 mm greater than the width of the cutter head, and the spacing between two adjacent blocking lines, the width of the first process cutting hole (3), the width of the second process cutting hole (4), and the width of the third process cutting hole (5) are the same.