A high-strength convex hull one-step forming die

Abstract

The present invention discloses a high-strength convex one-time forming die, comprising: an upper die mechanism, which includes an upper die base, a stripper plate and a punch assembly, the stripper plate is elastically connected to the upper die base, and the punch assembly includes a valve body, a piston and a punch; a lower die mechanism, which includes a lower template, an inner top block, a lower die base and a driving member; wherein the inner top block includes an upper block body, a spring and a lower seat body arranged in sequence from top to bottom, one end of the spring is fixedly mounted on the upper block body, and the other end thereof is fixedly mounted on the lower seat body, a distance sensor is provided on the lower seat body, the distance sensor is arranged on the inner side of the spring, and the distance sensor is used to monitor the distance between the bottom surface of the upper block body and the lower seat body, and the bottom end of the lower seat body is connected to a driving rod. Compared with the prior art, the present invention solves the problem that when the existing stamping die is used to form small-diameter, high-strength convex hulls on products, it is difficult to control the punch pressing force, which causes the inability to form in one time.

Description

Technical Field

[0001] The invention relates to the technical field of forming dies, in particular to a high-strength convex hull one-step forming die. Background Art

[0002] Stamping is a pressure processing method that uses a die mounted on a press to apply pressure to the material at room temperature, causing it to separate or plastically deform, thereby obtaining the desired part. The stamping die is a special process equipment used to process the material into parts during the cold stamping process.

[0003] When existing stamping dies are used to form small-diameter, high-stretch convex hulls, it is difficult to control the pressure of the punch on the material, resulting in the need for multi-step forming through several stations of a continuous die to ensure uniform stretching of the material. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-strength convex one-time forming die to solve the problem that when existing stamping dies are used to form small-diameter, high-strength convex hulls on products, it is difficult to control the punch pressing force, which leads to the inability to form them in one go.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: a high-strength convex hull one-step forming die, comprising:

[0006] The upper die mechanism includes an upper die base, a stripper plate and a punch assembly. The stripper plate is elastically connected to the upper die base. The punch assembly includes a valve body, a piston and a punch. The valve body is fixedly mounted on the upper die base. The valve body is connected to the air source device through an air supply pipe. The piston is disposed in the valve body. One end of the punch is connected to the piston and the other end thereof extends out of the valve body. The punch is disposed through the stripper plate.

[0007] The lower die mechanism includes a lower die plate, an inner ejector block, a lower die base, and a driving member. The workpiece to be stretched is placed on the surface of the lower die plate. The lower die plate is provided with a cavity corresponding to the position of the punch. The inner ejector block is provided in the cavity. The driving member is fixedly mounted on the lower die base. The driving rod of the driving member passes through the lower die base and the lower die plate, and the end of the driving rod is connected to the inner ejector block.

[0008] Among them, the inner top block includes an upper block, a spring and a lower seat arranged in sequence from top to bottom. One end of the spring is fixedly installed on the upper block, and the other end is fixedly installed on the lower seat. A distance sensor is provided on the lower seat. The distance sensor is provided on the inner side of the spring. The distance sensor is used to monitor the distance between the bottom surface of the upper block and the lower seat. The bottom end of the lower seat is connected to the driving rod.

[0009] As a further description of the above technical solution:

[0010] The valve body includes a cylinder body and a cover plate. A flange is provided at the top opening of the cylinder body. The cover plate closes the top opening of the cylinder body and contacts the flange. A rubber sealing ring is provided on the cover plate. A ring groove corresponding to the position of the rubber sealing ring is provided on the surface of the flange 3.

[0011] As a further description of the above technical solution:

[0012] An upper pad is provided on the upper die seat, a valve body mounting groove is provided on the upper pad, and the cylinder body is penetrated through the bottom surface of the valve body mounting groove.

[0013] As a further description of the above technical solution:

[0014] A plurality of circumferentially arranged positioning pins are provided on the flange, and the positioning pins pass through the through holes on the cover plate.

[0015] As a further description of the above technical solution:

[0016] The upper die base is provided with a blind hole whose position corresponds to the positioning pin.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0018] 1. In the present invention, bulges of different sizes / depths require different pressing forces when the punch is formed. In order to control the pressing forces on the upper and lower sides of the material to be stretched, on the one hand, according to the pressing force required by the punch, gas is introduced or discharged through the air supply pipe to adjust the air pressure in the valve body, thereby adjusting the pressing force of the punch; on the other hand, since the spring of the inner top block will be compressed and deformed during the forming process, in order to avoid the increase in the pressing force on the lower side of the part to be stretched due to the continuous increase in the reaction force provided by the spring as the punch descends, the compression deformation of the spring is calculated according to the pre-known spring coefficient and the required pressing force on the lower side of the part to be stretched. When a distance sensor is set to detect that the distance between the bottom surface of the upper block and the lower seat is equal to the fixed length of the inner top block minus the compression deformation of the spring, the driving rod of the driving member drives the inner top block downward as a whole, and the descending speed of the inner top block is equal to the descending speed of the punch, so that the pressing force on the lower side of the part to be stretched is stable, effectively ensuring the uniform stretching of the material to be stretched and achieving one-time forming. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a structural schematic diagram of a high-strength convex hull one-time forming mold.

[0021] Figure 2 This is a cross-sectional view of a high-strength convex hull one-time forming die.

[0022] Figure 3 This is a cross-sectional view of the lower die mechanism in a high-strength convex hull one-step forming die.

[0023] Figure 4 This is a schematic diagram of the structure of the punch assembly in a high-strength convex bulge one-step forming die.

[0024] Figure 5 This is a cross-sectional view of a punch assembly in a high-strength convex bulge one-step forming die.

[0025] Figure 6 Schematic diagram of the structure of the inner top block in a high-strength convex hull one-step molding die Figure 1 .

[0026] Figure 7 Schematic diagram of the structure of the inner top block in a high-strength convex hull one-step molding die Figure 2 .

[0027] Legend:

[0028] 1. Upper die mechanism; 11. Upper die base; 12. Stripper plate; 13. Punch assembly; 131. Valve body; 1311. Cylinder body; 1312. Cover plate; 1313. Flange; 1314. Rubber seal; 1315. Positioning pin; 132. Piston; 133. Punch; 134. Air supply pipe; 14. Upper backing plate;

[0029] 2. Lower die mechanism; 21. Lower die plate; 22. Inner top block; 221. Upper block; 2211. Guide rod; 222. Spring; 223. Lower seat; 2231. Guide hole; 224. Distance sensor; 23. Lower die seat; 24. Driving member; 241. Driving rod;

[0030] 3. Parts to be stretched. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0034] In the description of the embodiments of the present invention, it should be noted that the terms "upper" and "inner" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are orientations or positional relationships in which the inventive product is usually placed when in use. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0035] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0036] Example 1

[0037] See also Figure 1-7 The present invention provides a technical solution: a high-strength convex hull one-time forming die, comprising:

[0038] The upper die mechanism 1 includes an upper die base 11, a stripper plate 12, and a punch assembly 13. The stripper plate 12 is elastically connected to the upper die base 11. The punch assembly 13 includes a valve body 131, a piston 132, and a punch 133. The valve body 131 is fixedly mounted on the upper die base 11. The valve body 131 is connected to the air source device via an air supply pipe 134. The piston 132 is disposed in the valve body 131. One end of the punch 133 is connected to the piston 132, and the other end thereof extends out of the valve body 131. The punch 133 is disposed through the stripper plate 12.

[0039] The lower die mechanism 2 includes a lower die plate 21, an inner top block 22, a lower die base 23, and a driving member 24. The workpiece 3 to be stretched is placed on the surface of the lower die plate 21. The lower die plate 21 is provided with a cavity corresponding to the position of the punch 133. The inner top block 22 is disposed in the cavity. The driving member 24 is fixedly mounted on the lower die base 23. The driving rod 241 of the driving member 24 passes through the lower die base 23 and the lower die plate 21, and the end of the driving rod 241 is connected to the inner top block 22.

[0040] Among them, the inner top block 22 includes an upper block 221, a spring 222 and a lower seat 223 arranged in sequence from top to bottom. One end of the spring 222 is fixedly mounted on the upper block 221, and the other end is fixedly mounted on the lower seat 223. A distance sensor 224 is provided on the lower seat 223. The distance sensor 224 is arranged on the inner side of the spring 222. The distance sensor 224 is used to monitor the distance between the bottom surface of the upper block 221 and the lower seat 223. The bottom end of the lower seat 223 is connected to the driving rod 241.

[0041] The driving member 24 may be specifically an electric push rod to ensure that the running speed of the inner top block 22 is accurately controlled.

[0042] The bulges of different sizes / depths require different pressing forces when the punch 133 is forming. In order to control the pressing forces on the upper and lower sides of the material of the to-be-stretched part 3, on the one hand, according to the pressing force required by the punch 133, gas is introduced or discharged through the air supply pipe 134 to adjust the air pressure in the valve body 131, thereby adjusting the pressing force of the punch 133; on the other hand, since the spring 222 of the inner top block 22 will be compressed and deformed during the forming process, in order to avoid the reaction force provided by the spring 222 increasing continuously as the downward distance of the punch 133 increases, resulting in an increase in the pressing force on the lower side of the to-be-stretched part 3, according to the pre-known spring stiffness The coefficient and the required pressing force on the lower side of the workpiece 3 to be stretched are used to calculate the compressive deformation of the spring 222 (that is, the change in the distance between the upper block 221 and the lower seat 223). When the distance sensor 224 is set to detect that the distance between the bottom surface of the upper block 221 and the lower seat 223 is equal to the fixed length of the inner top block 22 minus the compressive deformation of the spring 222, the driving rod 241 of the driving member 24 drives the inner top block 22 downward as a whole, and the descending speed of the inner top block 22 is equal to the descending speed of the punch 133, so that the pressing force on the lower side of the workpiece 3 to be stretched is stable, which effectively ensures that the material of the workpiece 3 to be stretched is evenly stretched and realizes one-time forming.

[0043] Working principle: When a high-strength convex bulge is required to be formed in one step on the workpiece 3 to be stretched, the workpiece 3 to be stretched is first placed on the surface of the lower template 21, and then the upper mold mechanism 1 and the lower mold mechanism 2 are closed. After the stripper plate 12 presses the workpiece 3 to be stretched, as the upper mold mechanism 1 continues to descend, the punch 133 extends out of the stripper plate 12 and squeezes the material of the workpiece 3 to be stretched into the cavity of the lower template 21. The punch 133 and the inner top block 22 clamp the material of the workpiece 3 to be stretched on the upper and lower sides, so that the material of the workpiece 3 to be stretched is stretched and formed, forming a high-strength convex bulge in one step.

[0044] During the downward movement of the inner top block 22, when the upper block 221 is pressed downward and the deformation of the spring 222 reaches a set value, the driving rod 241 of the driving member 24 drives the inner top block 22 downward as a whole, and the downward speed of the inner top block 22 is equal to the downward speed of the punch 133.

[0045] After the molding is completed, the mold is separated, the upper mold mechanism 1 moves upward, and the driving rod 241 of the driving member 24 lifts the inner top block 22 to reset, so that the molded to-be-stretched part 3 is removed.

[0046] Example 2

[0047] Based on the above embodiment, this embodiment further makes the following improved technical solutions: the valve body 131 includes a cylinder body 1311 and a cover plate 1312, a flange 1313 is provided at the top opening of the cylinder body 1311, the cover plate 1312 closes the top opening of the cylinder body 1311, the cover plate 1312 contacts the flange 1313, a rubber sealing ring 1314 is provided on the cover plate 1312, and an annular groove corresponding to the position of the rubber sealing ring 1314 is provided on the surface of the flange 1313.

[0048] The air supply pipe 134 is provided on the cover plate 1312 , and the opening of the cylinder body 1311 is sealed by the cover plate 1312 , and the sealing is ensured by the rubber sealing ring 1314 .

[0049] Example 3

[0050] This embodiment further makes the following improved technical solutions based on the above embodiments: an upper pad 14 is provided on the upper die base 11, a valve body mounting groove is provided on the upper pad 14, and the cylinder body 1311 is penetrated through the bottom surface of the valve body mounting groove.

[0051] The upper pad 14 is fixed to the upper mold base 11 by bolts, and the flange 1313 of the cylinder body 1311 and the cover plate 1312 are positioned in the valve body mounting groove. There is no need to lock the cylinder body 1311 and the cover plate 1312 of the cylinder body 1311 separately. The valve body 131 is fixed by the installation of the upper pad 14, which simplifies the installation structure of the valve body 131 and facilitates disassembly and assembly.

[0052] Example 4

[0053] This embodiment further improves upon the above embodiment by providing the following technical solutions: A plurality of circumferentially arranged positioning pins 1315 are provided on flange 1313. Positioning pins 1315 extend through through-holes in cover plate 1312. Positioning pins 1315 provide preliminary positioning between cover plate 1312 and cylinder body 1311. As shown in the accompanying drawings, three positioning pins 1315 may be used.

[0054] The upper die base 11 is provided with a blind hole corresponding to the position of the positioning pin 1315. The positioning pin 1315 also realizes the positioning of the valve body 131 and the upper die base 11, thereby improving the integrity of the punch assembly 13.

[0055] Example 5

[0056] This embodiment further improves upon the above-mentioned embodiment by providing the following technical solutions: A plurality of guide rods 2211 are circumferentially arranged on the lower edge of the upper block 221, and guide holes 2231 are provided on the lower base 223, corresponding to the positions of the guide rods 2211. The guide rods 2211 ensure smooth longitudinal movement of the upper block 221 while effectively protecting the inner spring 222. Specifically, there are three guide rods 2211.

[0057] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A high-strength convex hull one-time forming die, characterized in that: include: An upper die mechanism comprises an upper die base, a stripper plate and a punch assembly, wherein the stripper plate is elastically connected to the upper die base, and the punch assembly comprises a valve body, a piston and a punch, wherein the valve body is fixedly mounted on the upper die base, the valve body is connected to an air source device via an air supply pipe, the piston is disposed in the valve body, one end of the punch is connected to the piston, and the other end thereof extends out of the valve body, and the punch is disposed through the stripper plate; The lower die mechanism includes a lower die plate, an inner top block, a lower die base, and a driving member. The workpiece to be stretched is placed on the surface of the lower die plate. The lower die plate is provided with a cavity corresponding to the position of the punch. The inner top block is provided in the cavity. The driving member is fixedly mounted on the lower die base. The driving rod of the driving member passes through the lower die base and the lower die plate, and the end of the driving rod is connected to the inner top block. The inner top block includes an upper block, a spring and a lower seat arranged in sequence from top to bottom, one end of the spring is fixedly mounted on the upper block, and the other end thereof is fixedly mounted on the lower seat, a distance sensor is provided on the lower seat, the distance sensor is arranged on the inner side of the spring, and the distance sensor is used to monitor the distance between the bottom surface of the upper block and the lower seat, and the bottom end of the lower seat is connected to the driving rod; In order to control the pressing force on the upper and lower sides of the material to be stretched, on the one hand, according to the pressing force required by the punch, gas is introduced or discharged through the air supply pipe to adjust the air pressure in the valve body, thereby adjusting the pressing force of the punch; On the other hand, since the spring of the inner top block will be compressed and deformed during the forming process, in order to avoid the increase in the pressing force on the lower side of the part to be stretched due to the increasing reaction force provided by the spring as the downward distance of the punch increases, the compression deformation of the spring, that is, the change in the distance between the upper block and the lower seat, is calculated based on the pre-known spring coefficient and the required pressing force on the lower side of the part to be stretched. When a distance sensor is set to detect that the distance between the bottom surface of the upper block and the lower seat is equal to the fixed length of the inner top block minus the compression deformation of the spring, the driving rod of the driving part drives the inner top block downward as a whole, and the descending speed of the inner top block is equal to the descending speed of the punch, so that the pressing force on the lower side of the part to be stretched is stable, ensuring uniform stretching of the material of the part to be stretched and achieving one-time forming.

2. A high-strength convex hull one-step forming die according to claim 1, characterized in that: The valve body includes a cylinder body and a cover plate. A flange is provided at the top opening of the cylinder body. The cover plate closes the top opening of the cylinder body and contacts the flange. A rubber sealing ring is provided on the cover plate. The surface of the flange is provided with a ring groove corresponding to the position of the rubber sealing ring.

3. The high-strength convex hull one-step forming die according to claim 2, characterized in that: An upper pad is provided on the upper die seat, a valve body mounting groove is provided on the upper pad, and the cylinder body is penetrated through the bottom surface of the valve body mounting groove.

4. The high-strength convex hull one-step forming die according to claim 2, characterized in that: The flange is provided with a plurality of circumferentially arranged positioning pins, and the positioning pins are passed through the through holes on the cover plate.

5. The high-strength convex hull one-step forming die according to claim 4, characterized in that: The upper die base is provided with a blind hole whose position corresponds to the positioning pin.

6. The high-strength convex hull one-step forming die according to claim 1, characterized in that: The lower edge of the upper block is provided with a plurality of guide rods arranged circumferentially, and the lower seat is provided with guide holes corresponding to the positions of the guide rods.

7. The high-strength convex hull one-step forming die according to claim 6, characterized in that: The number of the guide rods is 3.

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