High-stretching convex hull one-step forming die

Abstract

The invention discloses a high-tensile convex hull one-step forming die which comprises an upper die mechanism, a lower die mechanism, a lower die mechanism and a lower die mechanism, the upper die mechanism comprises 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 comprises a valve body, a piston and a punch; the lower die mechanism comprises a lower die plate, an inner ejector block, a lower die base and a driving piece. Wherein the inner top block comprises an upper block body, a spring and a lower seat body which are sequentially arranged from top to bottom, one end of the spring is fixedly mounted on the upper block body, the other opposite end of the spring is fixedly mounted on the lower seat body, a distance sensor is arranged on the lower seat body, and the distance sensor is arranged on the inner side of the spring; the distance sensor is used for monitoring the distance between the bottom face of the upper block and the lower base, and the bottom end of the lower base is connected with the driving rod. Compared with the prior art, the problem that one-time forming cannot be achieved due to the fact that the material pressing force of a punch is difficult to control when an existing stamping die is used for forming a small-diameter and high-stretching modeling convex hull on a product is solved.

Description

Technical Field

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

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

[0003] When the existing stamping die is used to form a small-diameter, high-stretch convex shape, it is difficult to control the pressure of the punch on the material, which usually requires 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 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, resulting in the inability to form in one time.

[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 comprises an upper die seat, a stripper plate and a punch assembly, wherein the stripper plate is elastically connected to the upper die seat, and the punch assembly comprises a valve body, a piston and a punch, wherein the valve body is fixedly mounted on the upper die seat, the valve body is connected to the air source device through an air supply pipe, the piston is arranged 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 penetrated by the stripper plate;

[0007] The lower die mechanism includes a lower die plate, an inner top block, a lower die seat 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 arranged in the cavity. The driving member is fixedly installed on the lower die seat. The driving rod of the driving member is passed through the lower die seat and the lower die plate, and the end of the driving rod is connected to the inner top block.

[0008] Among them, 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 oppositely is fixedly mounted on the lower seat body, and a distance sensor is arranged on the lower seat body, and the distance sensor is arranged on the inner side of the spring. 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 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 arranged at the top opening of the cylinder body. The cover plate closes the top opening of the cylinder body. The cover plate contacts the flange. A rubber sealing ring is arranged on the cover plate. A ring groove corresponding to the position of the rubber sealing ring is arranged on the surface of the flange 3.

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

[0012] An upper pad is arranged on the upper die seat, a valve body mounting groove is arranged 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 arranged on the flange, and the positioning pins are passed through the through holes on the cover plate.

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

[0016] The upper die seat 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, different sizes / depths of bulges 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 piece to be stretched due to the continuous increase in the reaction force provided by the spring as the downward distance of the punch increases, the compression deformation of the spring is calculated according to the pre-known spring stiffness coefficient and the required pressing force on the lower side of the piece 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 piece to be stretched is stable, effectively ensuring the uniform stretching of the material of the piece to be stretched, and realizing 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 drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

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

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

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

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

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

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

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

[0027] Legend:

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

[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] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 here 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 claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are 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, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the embodiments of the present invention, it should be noted that the terms "upper", "inner", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the inventive product is usually placed when in use. They 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0035] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to 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 comprises an upper die seat 11, a stripper plate 12 and a punch assembly 13. The stripper plate 12 is elastically connected to the upper die seat 11. The punch assembly 13 comprises a valve body 131, a piston 132 and a punch 133. The valve body 131 is fixedly mounted on the upper die seat 11. The valve body 131 is connected to the air source device through an air supply pipe 134. The piston 132 is arranged 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 penetrated 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 seat 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 arranged in the cavity. The driving member 24 is fixedly installed on the lower die seat 23. The driving rod 241 of the driving member 24 is passed through the lower die seat 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 body 221, a spring 222 and a lower seat body 223 arranged in sequence from top to bottom, one end of the spring 222 is fixedly mounted on the upper block body 221, and the other end is fixedly mounted on the lower seat body 223, and a distance sensor 224 is arranged on the lower seat body 223. The distance sensor 224 is arranged on the inner side of the spring 222, and the distance sensor 224 is used to monitor the distance between the bottom surface of the upper block body 221 and the lower seat body 223, and the bottom end of the lower seat body 223 is connected to the driving rod 241.

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

[0042] Convex bulges of different sizes / depths require different pressing forces when the punch 133 is formed. In order to control the pressing forces on the upper and lower sides of the material of the to-be-stretched piece 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 increase in the pressing force on the lower side of the to-be-stretched piece 3 due to the continuous increase in the reaction force provided by the spring 222 as the downward distance of the punch 133 increases, according to the pre-known spring stiffness The coefficient and the required pressing force on the lower side of the piece 3 to be stretched are used to calculate the compressive deformation of the spring 222 (i.e. the change in the distance between the upper block 221 and the lower seat 223). When the distance sensor 224 detects 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 piece 3 to be stretched is stable, which effectively ensures that the material of the piece 3 to be stretched is evenly stretched and realizes one-time forming.

[0043] Working principle: When it is necessary to form a high-stretch convex bulge in one step for 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 molded together. After the stripper plate 12 presses the workpiece 3 to be stretched, as the upper mold mechanism 1 continues to move downward, 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 both sides, so that the material of the workpiece 3 to be stretched is stretched and formed to form a high-stretch convex bulge in one step.

[0044] In the process of the inner top block 22 being pressed downward, when the upper block 221 is pressed downward and the deformation of the spring 222 reaches the set value, the driving rod 241 of the driving member 24 drives the inner top block 22 to move downward as a whole, and the descending speed of the inner top block 22 is equal to the descending 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] On the basis of the above embodiments, the present embodiment further provides 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 arranged on the cover plate 1312 , and the opening of the cylinder body 1311 is closed by the cover plate 1312 , and the sealing is ensured by the rubber sealing ring 1314 .

[0049] Example 3

[0050] This embodiment further provides the following improved technical solutions based on the above embodiments: an upper pad 14 is provided on the upper die seat 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 die base 11 by bolts, and the flange 1313 and the cover plate 1312 of the cylinder body 1311 are positioned in the valve body mounting groove. The cylinder body 1311 and the cover plate 1312 of the cylinder body 1311 do not need to be locked 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 provides the following improved technical solutions based on the above embodiment: a plurality of circumferentially arranged positioning pins 1315 are provided on the flange 1313, and the positioning pins 1315 are passed through the through holes on the cover plate 1312. The positioning pins 1315 realize the preliminary positioning of the cover plate 1312 and the cylinder body 1311. As shown in the attached drawings, three positioning pins 1315 can be used.

[0054] The upper die seat 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 seat 11, thereby improving the integrity of the punch assembly 13.

[0055] Example 5

[0056] This embodiment further provides the following improved technical solutions based on the above embodiment: a plurality of guide rods 2211 arranged circumferentially are provided at the lower edge of the upper block 221, and guide holes 2231 corresponding to the positions of the guide rods 2211 are provided on the lower seat 223. The guide rods 2211 ensure smooth longitudinal movement of the upper block 221 and effectively protect the inner spring 222. Specifically, the number of the guide rods 2211 is 3.

[0057] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-strength convex hull one-step forming die, characterized in that: include: An upper die mechanism, comprising an upper die seat, a stripper plate and a punch assembly, wherein the stripper plate is elastically connected to the upper die seat, and the punch assembly comprises a valve body, a piston and a punch, wherein the valve body is fixedly mounted on the upper die seat, 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 comprises a lower die plate, an inner top block, a lower die seat and a driving member, the workpiece to be stretched is placed on the surface of the lower die plate, a cavity corresponding to the position of the punch is provided on the lower die plate, the inner top block is provided in the cavity, the driving member is fixedly mounted on the lower die seat, a driving rod of the driving member is provided through the lower die seat and the lower die plate, and the end of the driving rod is connected to the inner top block; 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 oppositely is fixedly mounted on the lower seat body, a distance sensor is arranged on the lower seat body, the distance sensor is arranged on the inner side of the spring, 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 the driving rod.

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 arranged at the top opening of the cylinder body, the cover plate closes the top opening of the cylinder body, the cover plate contacts the flange, a rubber sealing ring is arranged on the cover plate, and a ring groove corresponding to the position of the rubber sealing ring is arranged on the surface of the flange 3.

3. A 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 seat 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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