Tool for preparing forming limit sample through linear cutting

Abstract

The tool comprises a base, a movable clamp, a movable clamp fixing bolt, a pressing head and a pressing head fixing bolt, a fixed clamping part is arranged on one side of the base, the other side of the base is connected with the movable clamp in a sliding mode, the movable clamp slides on the base in a short distance, and the pressing head fixing bolt is connected with the movable clamp. A sample is clamped between the fixed clamping part and the movable clamp; the fixed clamping part and the movable clamp are respectively connected with pressure heads through pressure head fixing bolts, and the pressure heads on the two sides are used for pressing and contacting the two sides of the upper surface of the sample; a movable clamp fixing bolt is further connected between the movable clamp and the base, and the movable clamp is fastened and loosened through the movable clamp fixing bolt. According to the utility model, the processing efficiency of preparing the forming limit sample can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of metal material performance detection, in particular to a tooling for preparing a forming limit specimen by wire cutting. Background Technique

[0002] As a pillar industry of the national economy, the quality and performance of products in the automotive industry are directly related to the national competitiveness and the interests of consumers. The forming limit diagram (FLD) is exactly one of the key tools to ensure the quality of automotive parts. Through the FLD, automotive manufacturers can accurately evaluate the ultimate deformation ability of different materials during the forming process, so as to select the most suitable materials and production processes to ensure that the quality and performance of parts reach the best state. Secondly, a large number of stamping and forming processes are involved in the automotive manufacturing process. By using the forming limit diagram, engineers can predict and avoid the rupture or instability of materials during the forming process, thereby improving production efficiency and reducing costs. At the same time, the FLD can also help optimize the die structure and stamping process, and improve the forming quality of complex-shaped parts.

[0003] During the experiment of obtaining the forming limit diagram, in order to obtain more comprehensive data, the size of the specimen will be changed during the experiment, and the test steps will be repeated. By collecting a series of strain data in different states, each test point can be plotted on a plane coordinate diagram, and finally smoothly connected to draw the forming limit diagram.

[0004] Since the shape and size of a set of forming limit specimens are different and there are many specifications, during wire cutting, only specimens of the same specification can be processed at the same time, which makes the processing efficiency very low and time-consuming. It often takes 10 hours to process a set of specimens required for a forming limit diagram.

[0005] The patent document with the publication number of CN111715788A discloses a device for preparing a forming limit test specimen. The specimen is a dumbbell-shaped specimen. The device includes upper and lower templates that are parallel to each other; a support plate, a punch, a blank holder, and a trapezoidal die corresponding to the punch are sequentially arranged between the upper template and the lower template. The cross-section of the punch is an olive shape with small ends and a convex middle part, and its length is not less than the width of the material plate. The blank holder is provided with an opening for the punch to pass through. A blank holding spring is arranged between the blank holder and the support plate and outside the punch. An active positioning component is arranged on one side of the die; a die opening for the waste material to fall off when the punch presses down is arranged in the middle of the upper surface of the lower template, and a lower die assembly composed of a support plate and a base is arranged on its lower surface. This invention improves the efficiency of preparing a forming limit specimen of a material by means of die stamping. When preparing a forming limit specimen of high-strength steel by a die, there are limitations and burrs are likely to appear. The utility model designs a tooling for preparing a forming limit specimen by wire cutting, which greatly improves the efficiency of preparing a forming limit specimen by wire cutting. Content of the Utility Model

[0006] According to the technical problems proposed above, a tooling for preparing a forming limit specimen by wire cutting is provided.

[0007] The technical means adopted by the present utility model are as follows:

[0008] A tooling for preparing a forming limit specimen by wire cutting, comprising: a base, a movable clamp, a movable clamp fixing bolt, a pressure head and a pressure head fixing bolt. A fixed clamping portion is provided on one side of the base, and a movable clamp is slidably connected to the other side. The movable clamp slides a short distance on the base, and the specimen is clamped between the fixed clamping portion and the movable clamp;

[0009] The fixed clamping portion and the movable clamp are respectively connected with a pressure head through a pressure head fixing bolt, and the pressure heads on both sides are used to press and contact both sides of the upper surface of the specimen;

[0010] A movable clamp fixing bolt is further connected between the movable clamp and the base, and the movable clamp is tightened and loosened through the movable clamp fixing bolt.

[0011] Further, the fixed clamping portion includes an upper plate, and one side surface of the upper plate is an arc concave surface facing the movable clamp;

[0012] The movable clamp is an L-shaped structure composed of a flat plate and a vertical plate. The vertical plate is slidably connected to the base, and one side surface of the flat plate is an arc concave surface facing the fixed clamping portion.

[0013] Further, two guide rails arranged at intervals are provided on the base, the movable clamp is slidably connected to the guide rails, and the movable clamp fixing bolt is located between the two guide rails.

[0014] Further, the pressure head is an L-shaped structure composed of a cross bar and a vertical bar. The pressure head fixing bolt is connected to the cross bar, and the lower end of the vertical bar is in contact connection with the upper surface of the specimen.

[0015] Further, a limiting block is provided on the other side of the base for limiting the sliding of the movable clamp in the direction towards the fixed clamping portion.

[0016] Further, a central positioning scale line is provided in the middle of the base.

[0017] Further, the central positioning scale line is a vertical straight line.

[0018] Compared with the prior art, the present utility model has the following advantages:

[0019] The utility model positions by means of a fixture, enabling circular wafers to be machined in advance simultaneously, avoiding the need to machine the outer circle for each specification. Compared with the original processing method, the wire cutting stroke is shortened by half, and the processing efficiency of machining the forming limit specimen is increased by 50%. In addition, the device has a simple structure, low processing cost, and obvious effects.

[0020] For the above reasons, the utility model can be widely promoted in the fields of metal material performance testing and the like. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of the tooling of the present utility model.

[0023] Figure 2 It is a flow chart of machining the specimen of the present utility model.

[0024] Figure 3 It is a schematic diagram of the forming limit specimen of the present utility model.

[0025] In the figure: 1, base; 2, movable clamp; 3, movable clamp fixing bolt; 4, pressure head; 5, pressure head fixing bolt; 6, guide rail; 7, center positioning scale line. Detailed Embodiments

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

[0027] The present utility model provides a tooling for wire cutting to prepare a forming limit specimen, which can improve the processing efficiency of preparing the forming limit specimen.

[0028] A tooling for preparing a forming limit specimen by wire cutting according to the utility model includes a base 1, a movable clamp 2, a movable clamp fixing bolt 3, a pressure head 4, a pressure head fixing bolt 5, a guide rail 6, and a center positioning scale line 7. A fixed clamping part is provided on one side of the base 1, and two sections of guide rails 6 arranged at intervals are designed on the other side of the base 1. The movable clamp 2 is slidably connected to the guide rail 6, and the movable clamp 2 can slide a short distance on the base 1. The specimen is clamped between the fixed clamping part and the movable clamp 2. The fixed clamping part and the movable clamp 2 are respectively connected with a pressure head 4 through a pressure head fixing bolt 5, and the pressure heads 4 on both sides are used to press and contact both sides of the upper surface of the specimen. A movable clamp fixing bolt 3 is also connected between the movable clamp 2 and the base 1. The movable clamp fixing bolt 3 is located between the two sections of guide rails 6, and the movable clamp 2 is tightened and loosened through the movable clamp fixing bolt 3. The fixed clamping part includes an upper plate, and one side surface of the upper plate is an arc concave surface facing the movable clamp 2. The movable clamp 2 is an L-shaped structure composed of a flat plate and a vertical plate. The vertical plate is slidably connected to the base 1, and one side surface of the flat plate is an arc concave surface facing the fixed clamping part. The pressure head 4 can move up and down. The pressure head 4 is an L-shaped structure composed of a cross bar and a vertical bar. The pressure head fixing bolt 5 is connected to the cross bar, and the lower end of the vertical bar is in contact connection with the upper surface of the specimen. A limit block is provided on the other side of the base 1 to limit the sliding of the movable clamp 2 in the direction towards the fixed clamping part. A center positioning scale line 7 is provided on one side surface of the middle part of the base 1, and the center positioning scale line 7 is a vertical straight line.

[0029] When processing the specimen, the following steps are included:

[0030] 1. Uniformly cut circular wafers from the specimens to be processed.

[0031] 2. Fix the fixture of the utility model on the wire cutting equipment, then move the wire cutting operation table to make the molybdenum wire of the wire cutting close to and aligned with the center positioning scale line 7 on the fixture for X-direction positioning, and finally translate the molybdenum wire away from the fixture along the Y direction.

[0032] 3. Stack the wafers of the specimens to be processed with the same specification cut in step 1 on the base 1.

[0033] 4. Close the movable clamp 2, tighten the movable clamp fixing bolt 3 to fix the wafer in the X and Y directions, and then tighten the pressure head fixing bolt 5 to fix the wafer in the Z direction.

[0034] 5. Adjust the wire cutting equipment to the program of the corresponding processing path, and use the electric spark edge-touching positioning method for Y-direction positioning.

[0035] 6. Start the program to process until the specimens of this specification are processed.

[0036] 7. Loosen the press head fixing bolt 5 and the movable clamp fixing bolt 3. The movable clamp 2 translates along the guide rail 6. Remove the processed specimen and place the blank of the specimen to be processed in the next specification. Repeat steps 3 - 7 until all specimens of all specifications are processed.

[0037] Example 1

[0038] For the tooling for preparing the forming limit specimen described in this example, the structural schematic diagram is as Figure 1 shown. The material of this example is a galvanized steel sheet with a thickness of 1 mm and a grade of HC420 / 780DPD+Z. Two sets of forming limit specimens need to be prepared. The specific steps are as follows:

[0039] (1) Stack up twenty sheets of material and cut out the circular blanks of the specimens to be processed at one time.

[0040] (2) Fix the fixture of the present utility model on the wire cutting equipment. Then move the wire cutting operation table to make the molybdenum wire of the wire cutting close to and align with the central positioning scale line 7 on the fixture for X - direction positioning. Finally, translate the molybdenum wire away from the fixture along the Y - direction.

[0041] (3) Stack up the blanks of the specimens to be processed in the same specification among the blanks cut in step 1 and place them on the base 1.

[0042] (4) Close the movable clamp 2, tighten the movable clamp fixing bolt 3 to fix the blank in the X and Y directions, and then tighten the press head fixing bolt 5 to fix the blank in the Z direction.

[0043] (5) Adjust the wire cutting equipment to the program of the corresponding processing path and use the electric spark edge - touching positioning method for Y - direction positioning.

[0044] (6) Start the program for processing until the specimen of this specification is processed.

[0045] (7) Loosen the press head fixing bolt 5 and the movable clamp fixing bolt 3. The movable clamp 2 translates along the guide rail 6. Remove the processed specimen and place the blank of the specimen to be processed in the next specification. Repeat steps (3) - (7) until all specimens of all specifications are processed.

[0046] Finally, it should be noted that: the above - mentioned embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A tooling for preparing a forming limit specimen by wire cutting, characterized in that, Comprising: A base (1), a movable clamp (2), a movable clamp fixing bolt (3), a pressure head (4) and a pressure head fixing bolt (5). One side of the base (1) is provided with a fixed clamping part, and the other side is slidably connected with the movable clamp (2). The movable clamp (2) slides a short distance on the base (1), and the specimen is clamped between the fixed clamping part and the movable clamp (2). The fixed clamping part and the movable clamp (2) are respectively connected with the pressure head (4) through the pressure head fixing bolt (5), and the pressure heads (4) on both sides are used to tightly contact both sides of the upper surface of the specimen. A movable clamp fixing bolt (3) is also connected between the movable clamp (2) and the base (1), and the tightening and loosening of the movable clamp (2) are realized through the movable clamp fixing bolt (3).

2. The tooling for preparing a forming limit specimen by wire cutting according to claim 1, characterized in that, The fixed clamping part includes an upper plate, and one side surface of the upper plate is an arc concave surface facing the movable clamp (2). The movable clamp (2) is an L-shaped structure composed of a flat plate and a vertical plate. The vertical plate is slidably connected with the base (1), and one side surface of the flat plate is an arc concave surface facing the fixed clamping part.

3. The tooling for preparing a forming limit specimen by wire cutting according to claim 1 or 2, characterized in that, Two guide rails (6) arranged at intervals are provided on the base (1), the movable clamp (2) is slidably connected with the guide rails (6), and the movable clamp fixing bolt (3) is located between the two guide rails (6).

4. The tooling for preparing a forming limit specimen by wire cutting according to claim 1, characterized in that The pressure head (4) is an L-shaped structure composed of a cross bar and a vertical bar. The pressure head fixing bolt (5) is connected with the cross bar, and the lower end of the vertical bar is in contact connection with the upper surface of the specimen.

5. The tooling for preparing a forming limit specimen by wire cutting according to claim 1, wherein A limit block is provided on the other side of the base (1) for limiting the sliding of the movable clamp (2) in the direction towards the fixed clamping part.

6. The tooling for preparing a forming limit specimen by wire cutting according to claim 1, characterized in that, A central positioning scale line (7) is provided in the middle of the base (1).

7. The tooling for preparing a forming limit specimen by wire cutting according to claim 6, characterized in that, The central positioning scale line (7) is a vertical straight line.

Images