CN113351818A

CN113351818A - Prepressing mechanism for upper die and stamping riveting die

Info

Publication number: CN113351818A
Application number: CN202110831554.6A
Authority: CN
Inventors: 梁莉羚; 郑茂; 梁广才
Original assignee: GUILIN FUDA CO Ltd
Current assignee: GUILIN FUDA CO Ltd
Priority date: 2021-07-22
Filing date: 2021-07-22
Publication date: 2021-09-07

Abstract

The invention belongs to the field of die equipment for machining, and particularly relates to a prepressing mechanism and a stamping riveting die for an upper die, wherein the prepressing mechanism comprises an annular plate, a prepressing cylinder and a fixing device, the pre-pressing cylinder comprises a spring, a cylinder and a guide post, the guide post is restricted by the inner wall of the cylinder and can only slide up and down, the guide post is limited because a third annular boss at the top end of the guide post is supported by a second annular boss at the bottom end of the cylinder, the circular plate is horizontally arranged, the circular plate surface is provided with an installation through hole for accommodating the cylinder, the inner diameter of the installation through hole is matched with the outer diameter of the cylinder, the punching riveting die comprises a riveting punch head, the guide post is a hollow pipe, when in use, the cylinder is arranged in the installation through hole, the fixing device comprises at least 3L-shaped connecting rods, the lower part of the riveting punch is inserted into the hollow pipe, the prepressing mechanism is convenient to replace and maintain, and the punching and riveting die is good in punching and riveting effect and long in service life.

Description

Prepressing mechanism for upper die and stamping riveting die

Technical Field

The invention belongs to the field of die equipment for machining, and particularly relates to a prepressing mechanism and a stamping riveting die for an upper die.

Background

The mould usually comprises last mould and lower mould, it includes the die block board to go up the mould, the fixed plate, the drift is installed to the fixed plate bottom, it is used for material returned or direction to be equipped with prepressing mechanism between the upper and lower mould, current prepressing mechanism is equipped with the elasticity guide post, see figure 3, current elasticity guide post links to each other with last mould, the spring sets up the top surface at the guide post, for the space of giving the guide post activity from top to bottom, must increase the backing plate between die block board and fixed plate, set up the guide post spring accommodation chamber in the backing plate, guide post and spring are because the moving part is easy wearing and tearing, often need to be changed, the fixed plate all needs to be dismantled when changing each time, install the fixed plate after accomplishing the change, above structure not only has thickened the mould volume, also increased the maintenance degree of difficulty. In addition, a prepressing mechanism of the die for stamping and riveting can also adopt a prepressing mode of prepressing glue (polyurethane glue stick). A prepressing mode of prepressing glue (polyurethane glue stick) is adopted, referring to fig. 4, the elasticity of the prepressing glue is utilized to be linked with the punch and sleeved outside the punch, so that after the part is elastically prepressed, the punch is contacted with the rivet to be riveted and formed; the pre-pressing glue can be directly contacted with the surface of a part, is easily influenced by temperature change, field oil stain and the like, and reduces the stability and the service life of the die.

Disclosure of Invention

The invention aims to provide a prepressing mechanism for an upper die, which is convenient to replace and maintain, and a stamping riveting die with good stamping riveting effect and long service life.

The technical scheme for achieving the purpose comprises the following contents.

A prepressing mechanism for an upper die, which comprises an annular plate, a prepressing cylinder and a fixing device,

the prepressing cylinder comprises a spring, a cylinder and a guide post, the cylinder is vertically arranged, the outer wall of the top end of the cylinder is provided with a first annular boss, the inner wall of the bottom end of the cylinder is provided with a second annular boss, the guide post is vertically arranged, the outer wall of the top end of the guide post is provided with a third annular boss, the spring is vertically arranged on the top end surface of the third annular boss of the guide post in the cylinder, the guide post is constrained by the inner wall of the cylinder and can only slide up and down, and the guide post is limited because the third annular boss at the top end of the guide post is supported by the second annular boss at the bottom end of the cylinder,

the annular plate is horizontally arranged, punch through holes allowing punches to pass through and mounting through holes for accommodating the cylinder are arranged on the annular plate surface, the number of the punch through holes is matched with the number and distribution of the punches of the die, the inner diameter of the mounting through holes is matched with the outer diameter of the cylinder, an annular concave table matched with the first annular boss is arranged at the top end of the inner wall of each mounting through hole, when the die is used, the cylinder is arranged in the mounting through holes, the annular concave table supports the first annular boss,

fixing device includes 3 at least L shape connecting rods, and during the use, L shape connecting rod evenly deploys in the periphery of annular plate along the circumferencial direction, and the end of the vertical end of L shape connecting rod can be dismantled fixedly with the cope match-plate pattern board and link to each other, and the horizontal end bearing annular plate's of L shape connecting rod bottom surface, fixed plate bottom surface is hugged closely to annular plate's top surface.

Furthermore, the horizontal end of L shape connecting rod is equipped with vertical lifting screw, and during the use, lifting screw's top tightly supports the bottom surface of annular slab, and lifting screw sets up the lift of being convenient for adjust the annular slab.

Furthermore, the end of the vertical end of the L-shaped connecting rod is connected with the upper die base plate through a bolt.

The prepressing mechanism is a detachable mechanism, and the guide post and the spring of the prepressing mechanism can be easily taken out of the cylinder for replacement, so that compared with the prior art, the structure of the upper die is simplified, the size of the upper die is reduced, and the maintainability of the die is improved.

Based on the prepressing mechanism, the invention provides a punching riveting die, which comprises an upper die base plate, a fixing plate and a riveting punch head arranged at the bottom of the fixing plate, wherein the guide post is a hollow pipe, the inner diameter of the hollow pipe is matched with the outer diameter of the riveting punch head, the riveting punch head penetrates through a cylinder and is inserted into the hollow pipe, and when the punching riveting die works, a spring is contracted under the pressure of the bottom surface of the fixing plate and the top end surface of the hollow pipe.

Furthermore, the wall thickness of the hollow tube is 2-4 mm. The hollow tube is selected to be of a proper size, so that the strength can be guaranteed, and the smaller volume of the pre-pressing cylinder is guaranteed.

Further, the upper die base plate is provided with a bolt through hole for mounting the L-shaped connecting rod. The prepressing mechanism is convenient to fix above the upper die, and the operation space is ensured.

When the punching riveting die is used, the end of the vertical end of all L-shaped connecting rods is installed on the upper die base plate, then the annular plate with the installed pre-pressing barrel is installed at the bottom of the upper die, the barrels on the annular plate are aligned to the bottoms of the riveting punches on the fixed plate, the annular plate is lifted, the riveting punches enter the barrels and are inserted into the hollow tubes, the L-shaped connecting rods are rotated to enable the horizontal ends of the L-shaped connecting rods to support the vacant positions of the bottom surfaces of the annular plates, the lifting screw rods can be adjusted through the L-shaped connecting rods (or the fastening mechanism of the vertical end can be adjusted), the annular plate is made to rise, and the bottom surfaces of the fixed plates are tightly attached to the top surfaces of the annular plates. (this operation can be easily done by 1 person)

The beneficial effects of above-mentioned punching press riveting mould are that, adopt spring hollow tube mechanism to replace the prepressing glue, effectively improved prepressing mechanism's life, the riveting drift stretches out from the hollow tube, its advantage lies in that the hollow tube can direct action around the riveting takes shape the position: the connecting parts between the parts are more tightly attached, and riveting forming is facilitated; and the stress deformation of other parts of the part is reduced in the riveting process, the next procedure is influenced, and the punching and riveting effect is better. The prepressing mechanism adopts a spring cylinder and hollow pipe structure, has the characteristics of stable stress and long service life, uses the punch of the die as positioning, and has simple structure, convenient assembly and disassembly and easy maintenance.

Drawings

FIG. 1 is a schematic diagram of an upper mold structure of a punch rivet mold according to an embodiment of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic diagram of a prior art upper mold structure;

fig. 4 is a schematic structural diagram of an upper die of a stamping and riveting die in the prior art.

In the figure, 1, an upper die base plate; 2. a fixing plate; 3. riveting a punch; 4. a cylinder; 4-1. a first annular boss; 4-2. a second annular boss; 5. a hollow tube; 5-1. a third annular boss; 6. a spring; 7. an annular plate; 7-1, installing a through hole; 7-1-1. annular concave table; an L-shaped connecting rod; 8-1, lifting screw.

Detailed Description

The present invention will be described in detail with reference to examples, and it should be understood that the described examples are only a part of the examples of the present invention, and not all of the examples. All other embodiments obtained by a person skilled in the art based on the present embodiments without any inventive step are within the scope of the present application.

Referring to fig. 1 and 2, a punching riveting die comprises a prepressing mechanism, an upper die plate 1, a fixing plate 2 and a riveting punch 3 arranged at the bottom of the fixing plate 2, wherein the prepressing mechanism comprises an annular plate 7, a prepressing cylinder and a fixing device,

the prepressing cylinder comprises a spring 6, a cylinder 4 and a guide post, the cylinder 4 is vertically arranged, the outer wall of the top end of the cylinder 4 is provided with a first annular boss 4-1, the inner wall of the bottom end of the cylinder 4 is provided with a second annular boss 4-2, the guide post is vertically arranged, the guide post is a hollow tube 5, the inner diameter of the hollow tube 5 is matched with the outer diameter of the riveting punch 3, the outer wall of the top end of the hollow tube 5 is provided with a third annular boss 5-1, the spring 6 is vertically arranged on the top end surface of the third annular boss 5-1 in the cylinder 4, the hollow tube 5 can only slide up and down under the restraint of the inner wall of the cylinder 4, the hollow tube 5 is limited due to the fact that the third annular boss 5-1 at the top end of the hollow tube 5 is supported by the second annular boss 4-2 at the bottom end of the cylinder 4,

the annular plate 7 is horizontally arranged, the annular plate 7 is provided with mounting through holes 7-1 for accommodating the cylinder 4 on the surface, the mounting through holes 7-1 are matched with the riveting punch heads 3 in quantity and distribution, the inner diameter of the mounting through holes 7-1 is matched with the outer diameter of the cylinder 4, the top end of the inner wall of the mounting through holes 7-1 is provided with annular concave platforms 7-1-1 matched with the first annular convex platforms 4-1, the cylinder 4 is arranged in the mounting through holes 7-1, the annular concave platforms 7-1-1 support the first annular convex platforms 4-1,

the fixing device comprises 3L-shaped connecting rods 8, the L-shaped connecting rods 8 are uniformly arranged on the periphery of the annular plate 7 along the circumferential direction, the L-shaped connecting rods 8 are fixedly connected with the upper die base plate 1 by inserting the end heads of the vertical ends of the L-shaped connecting rods 8 into bolt through holes in the upper die base plate 1 through bolts in a rotating manner, the horizontal ends of the L-shaped connecting rods 7 are provided with vertical lifting screw rods 8-1, the top ends of the lifting screw rods 8-1 support the bottom surface of the annular plate 7, the top surface of the annular plate 7 is tightly attached to the bottom surface of the fixing plate 2,

the riveting punch 3 penetrates through the cylinder 4 and is inserted into the hollow pipe 5, when in work, the spring 6 is contracted by the pressure of the bottom surface of the fixing plate 2 and the top end surface of the third annular boss 5-1,

in the embodiment, the wall thickness of the hollow pipe 5 is 3 mm; the hollow tube 5 is selected with a proper size, so that the strength can be ensured, and the smaller volume of the prepressing cylinder is ensured.

The prepressing mechanism of the embodiment is provided with a detachable mechanism, and after the annular plate 7 is detached from the upper die base plate 1, the hollow tube 5 and the spring 6 can be easily taken out from the cylinder 4 for replacement, so that compared with the prior art, the structure of the upper die is simplified, the size of the upper die is reduced, and the maintainability of the die is improved.

Finally, it should be noted that: although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or that equivalent substitutions and modifications may be made to some of the technical features of the embodiments, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present application should be included in the scope of the present application.

Claims

1. A prepressing mechanism for an upper die is characterized by comprising an annular plate, a prepressing cylinder and a fixing device,

2. The prepressing mechanism for upper molds according to claim 1, wherein the horizontal end of the L-shaped connecting rod is provided with a vertical lifting screw, and when in use, the top end of the lifting screw is tightly pressed against the bottom surface of the annular plate.

3. The prepressing mechanism for upper molds according to claim 1, wherein the end of the vertical end of the L-shaped connecting rod is connected to the upper mold base plate by a bolt.

4. A punching riveting die comprises an upper die base plate, a fixing plate, a riveting punch head arranged at the bottom of the fixing plate and a prepressing mechanism according to claim 1 or 2, wherein a guide column of the prepressing mechanism is a hollow tube, the inner diameter of the hollow tube is matched with the outer diameter of the riveting punch head, the lower part of the riveting punch head penetrates through a cylinder and is inserted into the hollow tube, and a spring is contracted under the pressure of the bottom surface of the fixing plate and the top end surface of the hollow tube during operation.

5. The die set forth in claim 4, wherein said hollow tube has a tube wall thickness of 2-4 mm.

6. The press-riveting die set forth in claim 4, wherein the upper die base plate is provided with bolt through holes for mounting L-shaped connecting rods.