Metal plate punching and chambering equipment and method thereof

Abstract

The invention discloses punching and chambering equipment for a metal plate, belongs to the technical field of forming performance and testing of the metal plate, and solves the problems that in the prior art, punching and chambering testing results are inaccurate, and electrification cannot be met. The upper die unit comprises an upper die plate, a supporting frame and a connecting rod assembled between the upper die plate and the supporting frame, a fixing piece is connected to the supporting frame, a pressing piece is connected to the fixing piece, the lower die unit comprises a lower die plate and a blank holder located above the lower die plate, a through hole is formed in the blank holder, a hole punching and reaming assembly is connected to the lower die plate, and the lower die plate is connected with the supporting frame. The metal plate is placed on the blank holder, the upper die unit moves downwards to drive the blank holder and the metal plate to move downwards, the punching and chambering assembly penetrates through the metal to achieve punching and chambering operation, and the punching and chambering equipment sequentially conducts punching and chambering operation, so that the problem that the accuracy of a test result is reduced due to secondary positioning of the metal plate is solved.

Description

Technical Field

[0001] The present invention relates to the field of metal sheet forming performance and test technology, in particular to a metal sheet punching and expanding device and method, and in particular to an electrified metal sheet punching and expanding composite device and method. Background Art

[0002] Hole expansion test is an important test in sheet metal formability test. Its purpose is to evaluate the flanging formability of metal sheets by pressing the specimen with a hole in the center into the die with a punch to expand the center hole of the specimen until necking or cracks appear at the edge of the hole. Since flanging is a typical deformation mode, the development of hole expansion test is crucial for predicting and optimizing related processes.

[0003] In the experimental operation process of sheet material performance testing, punching and hole expansion are two key steps in the study of metal sheet forming performance, which are widely used in material forming and manufacturing in the fields of automobiles, aerospace, etc. The traditional punching and hole expansion processes usually need to be carried out separately, that is, first use the punching equipment to punch holes in the sheet, and then use the hole expansion test equipment to expand the holes. There are some problems with this step-by-step approach: first, the sheet needs to be positioned twice, which increases the difficulty and time of the operation and reduces production efficiency; second, the punching and hole expansion equipment usually need to be configured separately, which increases the equipment cost and occupies space. In addition, during the punching and hole expansion process, the electrical performance of the material is often limited and cannot meet some special process requirements, such as electrifying or heating the material to change its performance during punching and hole expansion.

[0004] The purpose of the present invention is to provide a metal plate punching and expanding device, by which punching operations and expanding operations are performed without positioning the metal plate twice, thereby ensuring the accuracy of positioning, facilitating the judgment of the performance of the metal plate, and providing important data support for metal plate performance testing, defect prediction and process optimization, thereby having significant practical application value. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] To solve the above problems, the present invention adopts the following technical solutions.

[0007] On one hand, the present invention provides a technical solution for a metal sheet punching and expanding device, which is specifically as follows.

[0008] A metal plate punching and expanding equipment comprises an upper die unit and a lower die unit, wherein the upper die unit comprises an upper die plate, a support frame and a connecting rod assembled between the upper die plate and the support frame, the support frame is connected to a fixing part, the fixing part is connected to a pressing part, the lower die unit comprises a lower die plate and a pressure ring located above the lower die plate, the pressure ring is provided with a through hole, and the lower die plate is connected to a punching and expanding assembly, the metal plate is placed on the pressure ring, the upper die unit moves downward to drive the pressure ring and the metal plate to move downward, and the punching and expanding assembly penetrates the metal to realize punching and expanding operations.

[0009] Preferably, in the above-mentioned metal sheet punching and expanding equipment, guide pins, guide sleeves and air springs are also installed between the blank holder ring and the lower template. When the blank holder ring moves downward, the guide pins and guide sleeves cooperate to extend and retract so that the blank holder ring moves relative to the lower template. When the blank holder ring moves relative to the lower template, the air spring cooperates to extend and retract.

[0010] Preferably, in the above-mentioned metal sheet punching and expanding equipment, the pressure part includes a pressure plate and a connecting rod integrally formed with the pressure plate, and a gradient waste hole is also provided on the pressure part. During the punching operation, the punching and expanding assembly passes through the metal sheet and enters the gradient waste hole, thereby completing the punching operation of the metal sheet.

[0011] Preferably, in the above-mentioned metal sheet punching and expanding equipment, pin holes are provided on the upper and bottom parts of the connecting rod. When the pressure piece is connected to the fixing piece through the pin hole on the upper part of the connecting rod, the lower surface of the pressure plate is flush with the lower surface of the upper template. When the pressure piece is connected to the fixing piece through the pin hole on the lower part of the connecting rod, the lower surface of the pressure plate is located above the upper surface of the upper template.

[0012] Preferably, in the above-mentioned metal sheet punching and expanding equipment, the lower template is also fixedly connected to a supporting seat, one end of the supporting seat extends to the top of the lower template, and the other end extends to the bottom of the lower template, and the punching and expanding assembly is connected to the top of the supporting seat. When the upper mold unit moves downward, the pressure ring is driven to move downward, so that the punching and expanding assembly passes through the through hole to punch and expand the metal sheet.

[0013] Preferably, in the above-mentioned metal sheet punching and expanding equipment, the punching and expanding assembly includes a punching part and an expanding part. The expanding part is a conical structure, and the expanding part is connected to a supporting seat. The top of the expanding part is connected to the punching part. When punching, the punching part passes through the metal sheet and enters into the gradient waste hole of the pressing part to complete the punching operation of the metal sheet.

[0014] Preferably, in the above-mentioned metal sheet punching and expanding equipment, the top of the fixing part is connected to the upper mold base through an insulating connector, and the bottom of the supporting seat is connected to the lower mold base through an insulating connector. The insulating connector prevents the upper mold base and the lower mold base of the equipment from being energized.

[0015] Preferably, in the above-mentioned metal sheet punching and expanding equipment, the support frame and the lower template are provided with threaded holes for electricity, and the metal sheet can be tested with the assistance of current by connecting electricity to the threaded holes.

[0016] Another aspect of the present invention provides a method for punching and expanding holes in a metal sheet, which specifically adopts the following technical solution.

[0017] A metal plate punching and expanding method includes a punching operation and a hole expanding operation, and the steps are as follows:

[0018] Punching operation: The upper die unit moves downward so that the upper die plate and the pressing piece press against the surface of the metal sheet, thereby driving the blank holder to move downward. The punching piece in the punching and expanding assembly on the lower die plate passes through the metal sheet and enters the gradient waste hole in the pressing piece to complete the punching operation;

[0019] Hole expansion operation: drive the pressure piece to move upward so that the lower surface of the pressure piece is higher than the upper surface of the upper template, and the upper mold unit continues to move downward, so that the hole expansion piece of the punching and expanding assembly expands the punching hole on the metal plate to complete the hole expansion operation.

[0020] Preferably, in the above-mentioned metal sheet punching and expanding method, when performing punching and expanding operations, the metal sheet is energized through the supporting frame and the energized threaded holes on the lower template to test the material properties of the metal sheet subjected to current-assisted punching and expanding operations.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The punching and expanding equipment in the present invention positions the metal plate on the pressure ring when performing the punching operation, and then performs the punching operation through the punching and expanding assembly. After the punching operation is completed, the expanding operation is continued, thereby avoiding the problem of the need to re-position the metal plate when performing the expanding operation after the punching operation, which leads to a decrease in the accuracy of the test results, thereby ensuring the accuracy of the metal plate test results and providing important data support for the performance evaluation of the material.

[0023] (2) The present invention can also conduct tests by energizing the metal plate and then performing punching and expanding operations to determine the metal plate under the assistance of current to obtain test results for accurately determining the performance of the metal plate material. By analyzing the results, important data support is provided for performance testing, defect prediction and process optimization, thereby having significant practical application value. In addition, the punching and expanding equipment in the present invention is also provided with insulating connectors to ensure the operating safety of operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the metal plate punching and expanding device in the present invention;

[0025] Figure 2 for Figure 1 A front view of

[0026] Figure 3 It is a schematic diagram of the split structure of the upper mold unit in the present invention;

[0027] Figure 4 It is a structural schematic diagram of the pressing member in the present invention;

[0028] Figure 5 for Figure 4 A cross-sectional view of

[0029] Figure 6 It is a structural schematic diagram of the lower mold unit in the present invention;

[0030] Figure 7 It is a schematic diagram of the split structure of the lower mold unit in the present invention;

[0031] Figure 8 It is a structural schematic diagram of the punching and expanding assembly in the present invention;

[0032] Fig. 9 It is a schematic structural diagram of the device of the present invention for punching and expanding holes in metal plates.

[0033] The corresponding relationship between the illustrations and component names in the figure is as follows:

[0034] A. Insulating connector; B. Electrically threaded hole;

[0035] 100, upper die unit; 200, lower die unit;

[0036] 101, upper mold plate; 102, connecting rod; 103, supporting frame; 104, upper mold base; 105, pressing member;

[0037] 103a, fixing member; 105a, pressing plate; 105b, connecting rod; 105c, gradient waste hole;

[0038] 201, lower mold plate; 202, blank holder; 203, guide pin and guide sleeve; 204, air spring; 205, bearing seat; 206, lower mold base; 207, fixing seat; 208, punching and expanding assembly;

[0039] 208a, punching member; 208b, hole expanding member. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. The present invention provides the following embodiments.

[0043] like Figure 1 as well as Figure 2 As shown, it is a structural schematic diagram of the metal plate punching and expanding equipment in this embodiment. The punching and expanding equipment in this embodiment is used for punching and expanding metal plates, avoiding the problem of reduced accuracy caused by the metal plates needing to be positioned during punching and also needing to be positioned during expanding. The punching and expanding equipment in this embodiment includes an upper mold unit 100 and a lower mold unit 200. The upper mold unit 100 is located above the lower mold unit 200. During the punching and expanding operation, the upper mold unit 100 moves in the direction of the lower mold unit 200 to punch and expand the metal plate between the upper mold unit 100 and the lower mold unit 200.

[0044] like Figures 1 to 3 As shown, the upper mold unit 100 in this embodiment includes an upper mold plate 101, a fixing hole is opened on the upper mold plate 101, and a connecting rod 102 is fixedly connected to the upper surface of the upper mold plate 101, and a support frame 103 is fixedly installed on the top of the connecting rod 102. In this embodiment, a fixing part 103a is installed on the support frame 103, and the fixing part 103a is colinear with the axis of the fixing hole. In this embodiment, the top of the fixing part 103a is detachably connected to an insulating part A through a pin shaft, and the top of the insulating part A is connected to an upper mold base 104 through a pin shaft. In this embodiment, the upper mold base 104 is connected to an outer power unit, and the power unit can drive the upper mold unit 100 to move downward and approach the lower mold unit 200, and the upper mold unit 100 and the lower mold unit 200 cooperate with each other to punch and expand the metal plate.

[0045] like Figures 3 to 5 As shown, the top of the fixing member 103a in this embodiment extends to the top of the support frame 103, and the bottom of the fixing member 103a extends to the bottom of the support frame 103. In this embodiment, the bottom of the fixing member 103a is connected to the pressing member 105 through a pin shaft, and the axis of the pressing member 105 is colinear with the axis of the fixing hole on the upper template 101.

[0046] like Figure 4 as well as Figure 5 As shown, the pressing member 105 in this embodiment includes a pressing plate 105a and a connecting rod 105b assembled on the pressing plate 105a. Figure 5 As shown, the connecting rod 105b and the pressure plate 105a in this embodiment are an integrated structure, and a gradient waste hole 105c is provided on the pressure piece 105, and the gradient waste hole 105c is connected to the lower surface of the pressure plate 105a. In this embodiment, a pin hole is provided on the connecting rod 105b, and two groups of pin holes are provided. In addition, a pin hole is also provided at the lower end of the fixing piece 103a. During the punching operation, the pressure piece 105 is installed on the fixing piece 103a through the cooperation of the pin hole and the guide pin on the upper part of the connecting rod 105b. The pressing piece 105 is on the fixing piece 103a. At this time, the lower surface of the pressing plate 105a in the pressing piece 105 is flush with the lower surface of the upper template 101. The pressing piece 105 can be removed from the fixing piece 103a by removing the guide pin, and the pressing piece 105 is moved upward and fixed to the fixing piece 103a through the pin hole at the lower part of the connecting rod 105b and the pin hole on the fixing piece 103a with a wire, so that the pressing piece 105 is fixed on the fixing piece 103a. At this time, the lower surface of the pressing plate 105a is higher than the upper surface of the upper template 101.

[0047] like Figure 6 as well as Figure 7 As shown, it is a structural schematic diagram of the lower mold unit 200 in the present embodiment. The lower mold unit 200 in the present embodiment includes a lower mold plate 201, and a blank holder 202 is arranged above the lower mold plate 201. In the present embodiment, the blank holder 202 and the lower mold plate 201 are connected by a guide pin and guide sleeve 203. When the blank holder 202 moves downward, the guide pin and guide sleeve 203 are extended and retracted to cooperate with the formation of the blank holder 202. In addition, in the present embodiment, an air spring 204 is also installed between the blank holder 202 and the lower mold plate 201. When the blank holder 202 moves downward, the air spring 204 contracts. When the force on the blank holder 202 is released, the air spring 204 resets and drives the blank holder 202 to move upward.

[0048] like Figure 6 as well as Figure 7As shown, in this embodiment, the lower mold unit 200 also includes a fixed seat 207, which is installed on the lower surface of the lower mold plate 201 to ensure the stability of the lower mold unit 200. In addition, the lower mold plate 201 is coaxially installed with a bearing seat 205, the top of the bearing seat 205 extends to the top of the lower mold plate 201, and the lower end of the bearing seat 205 extends to the bottom of the lower mold plate 201. In this embodiment, the bearing seat 205 is connected to an insulating member A through a pin shaft, and the end of the insulating member A is connected to the lower mold base 206 through a pin shaft. In addition, in this embodiment, the top of the bearing seat 205 is also connected to a punching and expanding assembly 208, a pressure ring A through hole is opened at the center position of 202. When punching operation is required on the metal sheet, the metal sheet is placed on the pressure ring 202, and the power unit on the outside drives the upper mold unit 100 to move downward and press against the surface of the metal sheet. At the same time, the pressure ring 202 moves downward with the cooperation of the guide pin, guide sleeve 203 and air spring 204, and the punching and expanding assembly 208 passes through the through hole on the pressure ring and presses against the lower surface of the metal sheet. The upper mold unit 100 continues to move downward, and the top of the punching and expanding assembly 208 passes through the metal sheet and enters into the gradient waste hole 105c in the pressing part 105, thereby completing the punching and expanding operation of the metal sheet.

[0049] like Figure 8 As shown, it is a schematic diagram of the structure of the punching and expanding assembly 208 in this embodiment. The punching and expanding assembly 208 in this embodiment includes an expanding member 208b and a punching member 208a located on the top of the expanding member 208b. When a punching operation is required, the punching member 208a passes through the metal sheet and enters the gradient waste hole 105c to complete the punching operation. When a hole expansion operation is required, the hole expansion member 208b enters the punching hole to expand the inner diameter of the punching hole to complete the hole expansion operation. The hole expansion member 208b in this embodiment is a conical structure, and the hole expansion is completed by the conical structure. The process is as shown in FIG. Fig. 9 As shown, the metal sheet in this embodiment only needs to be positioned once on the blank holder 202 to complete the punching and hole expansion operations, and there is no need for secondary positioning to cause a decrease in accuracy, thereby ensuring the accuracy of the test results.

[0050] On one hand, this embodiment provides a technical solution for the above-mentioned metal sheet punching and expanding equipment, and on the other hand, this embodiment also provides a punching and expanding method for the above-mentioned equipment, which is specifically as follows.

[0051] First, place the metal sheet on the surface of the blank holder 202 in the lower die unit 200, and the outer power unit drives the upper die unit 100 to move downward. The upper die plate 101 and the pressing member 105 in the upper die unit 100 are pressed against the surface of the metal sheet. The upper die unit 100 continues to move downward due to the action of the power unit. At this time, the blank holder 202 in the lower die unit 200 continues to move downward, and the punching member 208a in the punching and expanding assembly 208 passes through the through hole of the blank holder 202 to punch the metal sheet.

[0052] When a hole expansion test is required, the pressure piece 105 is disassembled by the pin shaft and then pulled to move upward, and then the pin hole under the connecting rod 105b in the pressure piece 105 and the pin hole on the fixing piece 103a are fixed by guide pins, so that the pressure piece 105 is away from the upper template 101, and then the upper mold unit 100 is continued to be driven downward by the power unit, so that the conical hole expansion piece 208b in the hole expansion assembly 208 continues to enter the punching hole to expand the inner diameter of the punching hole, and the downward pressure of the upper mold unit 100 is stopped before the metal plate is about to break, and the crack condition on the surface of the metal plate is observed to obtain the test result in order to judge the performance of the metal plate.

[0053] Through the above-mentioned method, it is only necessary to position the metal sheet once on the pressure ring 202, and then perform the punching operation and then the hole expansion operation to complete the required test process and obtain the corresponding test results. The punching and hole expansion method in this embodiment is to position once, and then perform the punching and hole expansion operations in sequence, thereby avoiding the need to position again when performing the next unit hole expansion operation after the punching operation, and avoiding the problem of inaccurate positioning caused by the secondary positioning, thereby causing inaccurate test results. The accuracy of the test results can be guaranteed by the above-mentioned method.

[0054] In addition, if Figure 1 As shown, the support frame 103 and the lower mold plate 201 in this embodiment are provided with power-carrying threaded holes B. By connecting the power-carrying threaded holes B, the metal plate can be powered on for testing, so that the operator can obtain the material properties of the metal plate when punching and expanding the hole under the condition of current assistance. In addition, the existence of the insulating connector A prevents the upper mold base 104 and the lower mold base 206 of the equipment from being powered on, ensuring that other parts of the equipment are isolated from the powered materials, thereby ensuring the safety of the operators and avoiding the occurrence of electric shock to the operators.

[0055] The above content is a further detailed description of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the scope of protection determined by the claims submitted for the present invention.

Claims

1. A metal plate punching and expanding device, comprising an upper die unit (100) and a lower die unit (200), characterized in that: The upper mold unit (100) comprises an upper mold plate (101), a support frame (103) and a connecting rod (102) assembled between the upper mold plate (101) and the support frame (103); a fixing member (103a) is connected to the support frame (103); a pressing member (105) is connected to the fixing member (103a); the lower mold unit (200) comprises a lower mold plate (201) and a pressure ring (202) located above the lower mold plate (201); a through hole is provided on the pressure ring (202); and a punching and expanding assembly (208) is connected to the lower mold plate (201); a metal plate is placed on the pressure ring (202); the upper mold unit (100) moves downward to drive the pressure ring (202) and the metal plate to move downward; the punching and expanding assembly (208) penetrates the metal to perform punching and expanding operations.

2. The metal sheet punching and expanding device according to claim 1, characterized in that: A guide pin, guide sleeve (203) and an air spring (204) are also installed between the blank holding ring (202) and the lower template (201). When the blank holding ring (202) moves downward, the guide pin and guide sleeve (203) cooperate to extend and retract so that the blank holding ring (202) moves relative to the lower template (201). When the blank holding ring (202) moves relative to the lower template (201), the air spring (204) cooperates to extend and retract.

3. The metal sheet punching and expanding device according to claim 1, characterized in that: The pressing member (105) comprises a pressing plate (105a) and a connecting rod (105b) integrally formed with the pressing plate (105a). A gradient waste hole (105c) is also provided on the pressing member (105). During the punching operation, the punching and expanding assembly (208) passes through the metal sheet and enters the gradient waste hole (105c), thereby completing the punching operation on the metal sheet.

4. The metal sheet punching and expanding device according to claim 3, characterized in that: Pin holes are provided on the upper and lower parts of the connecting rod (105b). When the pressure piece (105) is connected to the fixing piece (103a) through the pin hole on the upper part of the connecting rod (105b), the lower surface of the pressure plate (105a) is flush with the lower surface of the upper template (101). When the pressure piece (105) is connected to the fixing piece (103a) through the pin hole on the lower part of the connecting rod (105b), the lower surface of the pressure plate (105a) is located above the upper surface of the upper template (101).

5. The metal sheet punching and expanding device according to claim 3 or 4, characterized in that: The lower template (201) is also fixedly connected to a bearing seat (205), one end of the bearing seat (205) extends to the top of the lower template (201), and the other end extends to the bottom of the lower template (201), and the punching and expanding assembly (208) is connected to the top of the bearing seat (205). When the upper mold unit (100) moves downward, the pressure ring (202) is driven to move downward, so that the punching and expanding assembly (208) passes through the through hole to punch and expand the metal plate.

6. The metal sheet punching and expanding device according to claim 5, characterized in that: The punching and expanding assembly (208) comprises a punching member (208a) and an expanding member (208b). The expanding member (208b) is a conical structure and is connected to the supporting seat (205). The top of the expanding member (208b) is connected to the punching member (208a). When punching, the punching member (208a) passes through the metal sheet and enters the gradient waste hole (105c) of the pressing member (105), thereby completing the punching operation on the metal sheet.

7. The metal sheet punching and expanding device according to claim 6, characterized in that: The top of the fixing member (103a) is connected to the upper mold base (104) via an insulating connector (A), and the bottom of the supporting seat (205) is connected to the lower mold base (206) via an insulating connector (A). The insulating connector (A) prevents the upper mold base (104) and the lower mold base (206) of the device from being energized.

8. The metal sheet punching and expanding device according to claim 1, characterized in that: The support frame (103) and the lower template (201) are provided with power-carrying threaded holes (B), and the metal plate can be subjected to current-assisted testing by connecting the power-carrying threaded holes (B).

9. A method for punching and expanding holes in a metal sheet, characterized in that: Including punching and hole expansion operations, the steps are as follows: Punching operation: the upper die unit (100) moves downward so that the upper die plate (101) and the pressing member (105) press against the surface of the metal plate, thereby driving the blank holder (202) to move downward, and the punching member (208a) in the punching and expanding assembly (208) on the lower die plate (201) passes through the metal plate and enters the gradient waste hole (105c) in the pressing member (105), completing the punching operation; Hole expansion operation: the pressing member (105) is driven to move upward so that the lower surface of the pressing member (105) is higher than the upper surface of the upper mold plate (101), and the upper mold unit (100) continues to move downward so that the hole expansion member (208b) of the hole expansion assembly (208) expands the punched hole on the metal plate to complete the hole expansion operation.

10. The metal sheet punching and expanding method according to claim 9, characterized in that: When punching and expanding operations are performed, the metal plate is energized through the supporting frame (103) and the energized threaded holes (B) on the lower template (201), and the insulating connector (A) partially insulates the equipment to test the material properties of the metal plate in the punching and expanding operations assisted by current.

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