A bending composite die structure for stainless steel narrow strip welded parts

Abstract

The present invention relates to the field of molds, and specifically discloses a bending composite mold structure for a stainless steel narrow strip weldment, including an upper mold assembly and a lower mold assembly, wherein the upper mold assembly includes an upper mold frame, a nitrogen spring, a primary molded part and a secondary molded part, wherein the nitrogen spring is connected between the upper mold frame and the upper mold seat of a punch press, wherein the primary molded part is formed by splicing a plurality of primary molded plates, and an annular primary molded inclined surface is provided at the bottom of the primary molded part, and the lower mold assembly includes a lower mold frame, a placement groove, an outer clamping part and an inner clamping part, wherein the placement groove is formed by an annular area between the outer clamping part and the inner clamping part, wherein the outer clamping part is formed by splicing a plurality of outer clamping blocks, wherein the inner clamping part is formed by splicing a plurality of inner clamping blocks, wherein the inner side surface of the outer clamping part is adapted to the outer side surface shape of the stainless steel narrow strip weldment, and the outer side surface of the inner clamping part is adapted to the inner side surface shape of the stainless steel narrow strip weldment. The present invention can realize the pressing of the sealing ring in a single stamping process.

Description

Technical Field

[0001] The invention belongs to the field of moulds, and in particular relates to a bending composite mould structure of a stainless steel narrow strip weldment. Background Art

[0002] The steel shell seal ring of the gas meter is a stainless steel narrow strip that is welded at the end and then punched out by a punch press. Its general shape is a rectangular ring. In the prior art, the seal ring needs to be pressed twice. The first punch presses the top of the seal ring into an inwardly bent inclined surface, and the second punch presses the inclined surface flat. The seal ring pressing process is relatively cumbersome, and two punch presses are required to realize the two punching of the seal ring, which is costly. Summary of the invention

[0003] In view of the above-mentioned deficiencies of the prior art, the present invention provides a bending composite mold structure for a stainless steel narrow strip weldment to solve the problem in the prior art that the sealing ring pressing process requires two stamping processes, resulting in a cumbersome and high cost sealing ring pressing process.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A bending composite die structure for a stainless steel narrow strip weldment, comprising an upper die assembly and a lower die assembly.

[0006] The upper mold assembly includes an upper mold frame, a nitrogen spring, a primary molded part and a secondary molded part, wherein the nitrogen spring is connected between the upper mold frame and the upper mold base of the punch press, the primary molded part is arranged at the bottom of the upper mold frame, the primary molded part is formed by splicing a plurality of primary molded plates, and a circumferential primary molded inclined surface is arranged at the bottom of the primary molded part, the secondary molded part is located on the inner side of the primary molded part, and the secondary molded part is arranged at the bottom of the upper mold base of the punch press;

[0007] The lower die assembly includes a lower die frame, a placement groove, an outer clamping piece and an inner clamping piece. The lower die frame is connected to the lower die base of the punch press. The placement groove is used to place the stainless steel narrow strip weldment. The inner clamping piece is located on the inner side of the outer clamping piece. The placement groove is composed of an annular area between the outer clamping piece and the inner clamping piece. The outer clamping piece is composed of a plurality of outer clamping blocks. The inner clamping piece is composed of a plurality of inner clamping blocks. The inner side surface of the outer clamping piece is adapted to the shape of the outer side surface of the stainless steel narrow strip weldment. The outer side surface of the inner clamping piece is adapted to the shape of the inner side surface of the stainless steel narrow strip weldment.

[0008] Furthermore, an insert strip is fixed on the upper mold base corresponding to each primary molding plate, the insert strip is located outside the primary molding plate, and the outer side surface of the primary molding plate elastically abuts against the inner side surface of the insert strip, and the inner side surface of the insert strip has a protruding portion and a recessed portion.

[0009] Furthermore, the bottom of the inner side surface of the insert strip has an outer clamping inclined surface that can elastically abut against the outer edge of the outer clamping block.

[0010] Furthermore, the slope of the primary molding slope at the bottom of the primary molding part is 30° to 60°.

[0011] Furthermore, the mold structure includes at least two groups of upper mold assemblies and lower mold assemblies arranged side by side in a transverse manner.

[0012] Furthermore, the one-time formed part is formed by splicing four one-time formed plates, the outer clamping part is formed by splicing four outer clamping blocks, and the inner clamping part is formed by splicing four inner clamping blocks. The four one-time formed plates, four outer clamping blocks and four inner clamping blocks all correspond one by one to the four sides of the stainless steel narrow strip weldment.

[0013] Furthermore, the secondary molded part is an annular body, and an auxiliary inner clamping column that can be inserted downward between four inner clamping blocks is fixed on the inner side of the secondary molded part on the upper mold base, and an auxiliary inner clamping inclined surface is provided on the top of the inner clamping block. When the auxiliary inner clamping column moves downward, the bottom of the auxiliary inner clamping column opens the auxiliary inner clamping inclined surface of the inner clamping block to achieve auxiliary clamping.

[0014] The beneficial effects of the present invention are:

[0015] 1. The present invention provides a primary molded part and a secondary molded part, the sealing ring is pre-bent by the primary molded part, and then the primary molded part makes room for the secondary molded part to move downward, and the secondary molded part is used for secondary pressing. In the process of the upper mold frame of the punch press closing the mold downward, two pressing processes are realized, and the pressing of the sealing ring is completed through one stamping process.

[0016] 2. An inner clamp and an outer clamp are provided, and the sealing ring is clamped between the inner clamp and the outer clamp so that the initial irregular shape of the sealing ring is squeezed into a regular shape that meets the requirements, and the initial positioning of the sealing ring on the lower mold frame can also be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0018] Figure 2 for Figure 1 One of the sets of upper die assembly and lower die assembly.

[0019] Figure 3 for Figure 2 Structural diagram of the middle and lower mold assembly.

[0020] Figure 4 for Figure 3 The top view shows that both the outer clamping member and the inner clamping member are in a relaxed state.

[0021] Figure 5 for Figure 4 Schematic diagram showing that both the outer clamping parts and the inner clamping parts are in a clamped state.

[0022] Figure 6 for Figure 2 Structural diagram of the middle and upper mold assembly.

[0023] Figure 7 for Figure 6 Longitudinal cross-section along the cutting.

[0024] Figure 8 This is a diagram of the forming process of stainless steel narrow strip weldments.

[0025] The reference numerals include:

[0026] Upper die seat 1,

[0027] Lower die seat 2,

[0028] Upper mold assembly 3, mounting seat 301, nitrogen spring 302, insert 303, outer clamping slope 3030, protrusion 3031, recessed portion 3032, auxiliary inner clamping column 304, upper mold frame 305, guide column 306, primary molding plate 307, primary molding slope 3070, secondary molding part 308,

[0029] The lower mold assembly 4, the lower mold frame 401, the outer clamping block 402, the inner clamping block 403, the auxiliary inner clamping inclined surface 4031, the guide hole 404, the placement groove 405, and the plug hole 406. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] When implementing it, Figure 1 and Figure 2 As shown:

[0032] A bending composite mold structure for a stainless steel narrow strip weldment includes an upper mold assembly 3 and a lower mold assembly 4. The upper mold assembly 3 and the lower mold assembly 4 are arranged side by side horizontally in one group or multiple groups. This embodiment has two groups, which are suitable for simultaneously pressing two stainless steel narrow strip weldments (sealing rings).

[0033] The structure of the lower die assembly 4 is as follows Figure 3 and Figure 4 , including a lower die frame 401, a placement groove 405, an outer clamping piece and an inner clamping piece. The lower die frame 401 is fixedly installed on the lower die base 2 of the punch press by bolts. The placement groove 405 is used to place the stainless steel narrow strip welding piece. The inner clamping piece is located on the inner side of the outer clamping piece. The placement groove 405 is composed of an annular area between the outer clamping piece and the inner clamping piece.

[0034] The outer clamping piece is composed of a plurality of outer clamping blocks 402, and the inner clamping piece is composed of a plurality of inner clamping blocks 403. The inner side surface of the outer clamping piece is adapted to the outer side surface shape of the stainless steel narrow strip weldment, and the outer side surface of the inner clamping piece is adapted to the inner side surface shape of the stainless steel narrow strip weldment. In this embodiment, the outer clamping piece is composed of four outer clamping blocks 402, and the inner clamping piece is composed of four inner clamping blocks 403. The four outer clamping blocks 402 and the four inner clamping blocks 403 correspond to the four sides of the stainless steel narrow strip weldment one by one.

[0035] The clamping method of the external clamping part is as follows: an external clamping reset spring is installed between each external clamping block 402 and the lower mold frame 401, and the expansion and contraction direction of the external clamping reset spring is perpendicular to the side of the corresponding stainless steel narrow strip weldment. When each external clamping block 402 is subjected to a force toward the internal clamping block 403, each external clamping block 402 moves in a direction perpendicular to the side of the corresponding stainless steel narrow strip weldment until the inner side surface of each external clamping block 402 is completely fitted with the outer side surface of the stainless steel narrow strip, that is, the external clamping of the stainless steel narrow strip weldment by the external clamping part is realized, and the external clamping reset spring is stretched during this process; when the external force applied to each external clamping block 402 is removed, each external clamping block 402 retreats under the elastic force of the external clamping reset spring, thereby realizing the relaxation of the stainless steel narrow strip weldment by the external clamping part.

[0036] The clamping method of the inner clamping parts is: the four inner clamping blocks 403 are driven by a pneumatic cylinder or a hydraulic cylinder so that the inner clamping blocks 403 move in a direction perpendicular to the side surface of the corresponding stainless steel narrow strip weldment. When the pneumatic cylinder or the hydraulic cylinder drives the four inner clamping blocks 403 to extend until the outer side surfaces of the four inner clamping blocks 403 are completely in contact with the inner side surfaces of the stainless steel narrow strip weldment, the inner clamping parts clamp the stainless steel narrow strip weldment. When the pneumatic cylinder or the hydraulic cylinder drives the four inner clamping blocks 403 to retract, the inner clamping parts loosen the stainless steel narrow strip weldment.

[0037] The structure of the upper mold assembly 3 is as follows Figure 2 , 6 As shown in , 7 , it includes a mounting seat 301, an upper mold frame 305, a nitrogen spring 302, a primary molded part and a secondary molded part.

[0038] During installation, the mounting seat 301 is fixed to the bottom of the upper die seat 1 of the punch press by bolts, and the nitrogen spring 302 is connected between the upper die frame 305 and the mounting seat 301 , leaving a gap of about 1 mm between the bottom of the nitrogen spring 302 and the top of the upper die frame 305 .

[0039] The primary forming part is arranged at the bottom of the upper mold frame 305. The primary forming part is a split annular structure formed by splicing a plurality of primary forming plates 307. The inner edge of the bottom of the primary forming part has an annular primary forming slope 3070. The slope of the primary forming slope 3070 at the bottom of the primary forming part is 30° to 60°, preferably 45°. The annular profile of the primary forming slope 3070 at the bottom of the primary forming part is adapted to the profile of the stainless steel narrow strip weldment, so that when the primary forming slope 3070 at the bottom of the primary forming part is pressed on the top of the stainless steel narrow strip weldment, the top of the stainless steel narrow strip weldment can be pressed to the same slope as the primary forming slope 3070. In this embodiment, the primary forming part is spliced ​​by four primary forming plates 307, and the four primary forming plates 307 correspond to the four sides of the stainless steel narrow strip weldment one by one.

[0040] The secondary molded part 308 is located inside the primary molded part, and the secondary molded part 308 is fixedly connected to the mounting seat. The secondary molded part is an integral annular body.

[0041] The mounting seat 301 is fixed with an inserting strip 303 corresponding to each primary molding plate 307. The inserting strip 303 is located outside the primary molding plate 307, and the outer side surface of the primary molding plate 307 elastically abuts against the inner side surface of the inserting strip 303. The inner side surface of the inserting strip 303 has a protruding portion 3031 and a recessed portion 3032. Here, the elastic abutment between the outer side surface of the primary molding plate 307 and the inner side surface of the inserting strip 303 means that a primary molding return spring is connected between the outer side surface of the primary molding plate 307 and the upper mold frame 305, and the outer side surface of the primary molding plate 307 abuts against the inner side surface of the inserting strip 303. When the outer side surface of the primary molding plate 307 abuts against the protrusion of the insertion strip 303, the primary molding return spring is in a compressed state, the four primary molding plates 307 are in a clamped state, and the primary molding part and the secondary molding part 308 have an overlapping part in horizontal projection; when the outer side surface of the primary molding plate 307 abuts against the recessed part of the insertion strip 303, the four primary molding plates 307 of the primary molding part move away from each other, leaving space for the secondary molding part 308 to move downward.

[0042] The bottom of the inner side of the insert strip 303 also has an outer clamping inclined surface 3030 that can abut against the outer edge of the outer clamping block 402. The lower mold frame 401 is provided with a plug hole 406 for inserting the insert strip 303. When the upper mold assembly 3 moves downward and each insert strip 303 is inserted downward into the corresponding plug hole 406, the outer clamping block 402 can be retracted and extended through the cooperation of the outer clamping inclined surface 3030 at the bottom of the insert strip 303 and the outer edge of the outer clamping block 402.

[0043] An auxiliary inner clamping column 304 that can be inserted downward between the four inner clamping blocks 403 is also fixed on the inner side of the secondary molded part 308 on the mounting seat 301. An auxiliary inner clamping inclined surface 4031 is provided on the top of the inner clamping block 403. Auxiliary inner clamping is achieved by the auxiliary inner clamping inclined surface 4031 of the inner clamping block 403 being supported by the bottom of the auxiliary inner clamping column 304 when the auxiliary inner clamping column 304 moves downward.

[0044] The present invention completes a stamping process including the following stages:

[0045] (1) Sealing ring loading:

[0046] At this stage, the four outer clamping blocks 402 are in a retracted state under the action of the outer clamping reset spring. The four inner clamping blocks 403 are first driven to retract by the cylinder or hydraulic cylinder, so that the four inner clamping blocks 403 are in a relaxed state, and the feeding arm is used to transfer the sealing ring to be pressed to the annular placement groove 405 formed between the outer clamping part and the inner clamping part, and then the cylinder or hydraulic cylinder drives the four inner clamping blocks 403 to extend, so that the four inner clamping blocks 403 clamp the four inner side surfaces of the sealing ring from the inside of the sealing ring.

[0047] (2) Initial positioning of the sealing ring

[0048] The upper die base 1 of the punch press moves downward, and each insert strip 303 is inserted into each insertion hole 406 on the lower die frame 401. The outer clamping slope 3030 at the bottom of the insert strip 303 presses against the edge of the outer clamping block 402 of the lower die assembly 4 and moves downward, so that the four outer clamping blocks 402 gradually move closer together until the protrusion 3031 of the insert strip 303 and the outer side wall of the outer clamping block 402 are in contact with each other. At this time, the four outer clamping blocks 402 are just spliced ​​into the shape of the entire outer clamping part, and the four outer clamping blocks 402 and the four outer side surfaces of the sealing ring are respectively in contact and close to each other, so that the sealing ring is squeezed from the initial irregular shape to a regular shape through the squeezing of the outer side surface and the inner side surface of the sealing ring by the four outer clamping blocks 402 and the four inner clamping blocks 403. At the same time, the squeezing of the sealing ring by the outer clamping part and the inner clamping part can also realize the initial positioning of the sealing ring on the lower die frame 401.

[0049] During this process, the protruding portion 3031 of the insert 303 remains in contact with the outer side wall of the primary forming plate 307, so that the four primary forming plates 307 remain close to each other.

[0050] (3) One-step molding

[0051] The four once-formed plates 307 descend until the once-formed inclined surface 3070 at the bottom of the once-formed plate 307 is in contact with the top of the sealing ring. As the once-formed plate 307 continues to descend, the once-formed inclined surface 3070 is completely in contact with the outer side surface of the top of the sealing ring, so that the top of the sealing ring is changed from a vertical state to a pre-bent state bent inward by 45°.

[0052] During this process, the outer clamping block 402 always maintains a clamping state.

[0053] (4) Secondary molding

[0054] After the primary molding is completed, the upper mold frame 305 and the lower mold frame 401 are molded together, the upper mold frame 305 remains stationary, the upper mold base 1 and the mounting base 301 continue to descend, and the various insertion strips 303 fixed on the mounting base 301 continue to move downward, and the protruding portions 3031 of the insertion strips 303 gradually separate downward from the outer side surface of the primary molding plate 307 until the recessed portions 3032 of the insertion strips 303 are fitted with the primary molding plate 307 on the upper mold frame 305 in a stationary state. The primary molding plate 307 moves laterally back into the recessed portions 3032 of the insertion strips 303 under the action of the primary molding return spring, and the four primary molding plates 307 move away from each other, leaving space for the secondary molding plate 308 to move downward. At the same time, as the insertion strip 303 continues to move downward, the protruding portion 3031 of the insertion strip 303 gradually moves downward away from the outer side surface of the outer clamping block 402 until the recessed portion 3032 of the insertion strip 303 fits with the outer side surface of the outer clamping block 402. The outer clamping block 402 retreats under the action of the outer clamping reset spring, and the four outer clamping blocks 402 move away from each other, making room for the secondary molding plate 308 to be pressed downward, thereby preventing the primary molding plate 307 and the outer clamping block 402 from affecting the pressing downward molding of the secondary molding plate 308.

[0055] As the upper mold base 1 continues to move downward, the secondary molding plate 308 moves downward accordingly. When the bottom of the secondary molding plate 308 contacts the top of the sealing ring in the pre-bent state, the secondary molding plate 308 gradually flattens the bent portion of the top of the sealing ring until the nitrogen spring 302 is compressed to the limit position, and the top of the sealing ring is pressed from the pre-bent state of bending inwards 45° to the formed state of bending inwards 90°.

[0056] At this point, the sealing ring molding is completed.

[0057] (5) Mold opening

[0058] After the sealing ring is pressed, the upper die seat 1 drives the upper die frame 305 to move upward.

[0059] (6) Sealing ring cutting

[0060] The air cylinder or hydraulic cylinder first drives the four inner clamping blocks 403 to retract, and the four inner clamping blocks 403 release the clamping of the sealing ring, and then the unloading feeding arm takes away the sealing ring that has completed the pressing.

[0061] At this point, a stamping process of the mold of the present invention is completed.

[0062] The above are only preferred implementations of the present invention. It should be pointed out that a number of modifications and improved technical solutions made by those skilled in the art without departing from the technical solution should also be deemed to fall within the scope of protection required by the claims.

Claims

1. A bending composite mold structure for a stainless steel narrow strip weldment, comprising an upper mold assembly and a lower mold assembly, characterized in that: The upper mold assembly includes an upper mold frame, a nitrogen spring, a primary molded part and a secondary molded part, wherein the nitrogen spring is connected between the upper mold frame and the upper mold base of the punch press, the primary molded part is arranged at the bottom of the upper mold frame, the primary molded part is formed by splicing a plurality of primary molded plates, and a circumferential primary molded inclined surface is arranged at the bottom of the primary molded part, the secondary molded part is located on the inner side of the primary molded part, and the secondary molded part is arranged at the bottom of the upper mold base of the punch press; The lower die assembly comprises a lower die frame, a placement groove, an outer clamping piece and an inner clamping piece, the lower die frame is connected to the lower die base of the punch press, the placement groove is used to place the stainless steel narrow strip welded piece, the inner clamping piece is located on the inner side of the outer clamping piece, the placement groove is formed by an annular area between the outer clamping piece and the inner clamping piece, the outer clamping piece is formed by splicing a plurality of outer clamping blocks, the inner clamping piece is formed by splicing a plurality of inner clamping blocks, the inner side surface of the outer clamping piece is adapted to the shape of the outer side surface of the stainless steel narrow strip welded piece, and the outer side surface of the inner clamping piece is adapted to the shape of the inner side surface of the stainless steel narrow strip welded piece; An inserting strip is fixed on the upper die seat corresponding to each primary forming plate. The inserting strip is located on the outer side of the primary forming plate, and the outer side surface of the primary forming plate elastically abuts against the inner side surface of the inserting strip. The inner side surface of the inserting strip has a protruding portion and a recessed portion. The lower die frame is provided with an inserting hole for inserting the inserting strip.

2. The bending composite mold structure of a stainless steel narrow strip weldment according to claim 1, characterized in that: The bottom of the inner side of the insert strip is provided with an outer clamping inclined surface which can elastically abut against the outer edge of the outer clamping block.

3. The bending composite mold structure of a stainless steel narrow strip weldment according to claim 1, characterized in that: The slope of the primary molding inclined surface at the bottom of the primary molding part is 30° to 60°.

4. The bending composite mold structure of a stainless steel narrow strip weldment according to claim 1, characterized in that: The mold structure includes at least two groups of upper mold assemblies and lower mold assemblies arranged side by side in a transverse direction.

5. A bending composite mold structure for a stainless steel narrow strip weldment according to any one of claims 1 to 4, characterized in that: The one-time formed part is formed by splicing four one-time formed plates, the outer clamping part is formed by splicing four outer clamping blocks, and the inner clamping part is formed by splicing four inner clamping blocks. The four one-time formed plates, four outer clamping blocks and four inner clamping blocks all correspond to the four sides of the stainless steel narrow strip weldment one by one.

6. A bending composite mold structure for a stainless steel narrow strip weldment according to claim 5, characterized in that: The secondary molded part is an annular body, and an auxiliary inner clamping column that can be inserted downward between four inner clamping blocks is fixed on the inner side of the secondary molded part on the upper mold base. An auxiliary inner clamping inclined surface is provided on the top of the inner clamping block. Auxiliary clamping is achieved by the bottom of the auxiliary inner clamping column spreading the auxiliary inner clamping inclined surface of the inner clamping block when the auxiliary inner clamping column moves downward.

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