CN109623322B

CN109623322B - Pressure riveting die and pressure riveting equipment

Info

Publication number: CN109623322B
Application number: CN201811592946.6A
Authority: CN
Inventors: 呙少华; 崔贞涛
Original assignee: Hubei Hangjia Magna Seating System Co Ltd
Current assignee: Hubei Aviation Precision Machinery Technology Co Ltd
Priority date: 2018-12-25
Filing date: 2018-12-25
Publication date: 2020-05-01
Anticipated expiration: 2038-12-25
Also published as: CN109623322A

Abstract

The invention discloses a pressure riveting die and pressure riveting equipment, wherein the pressure riveting die comprises an upper die assembly and a lower die assembly, wherein the upper die assembly comprises a first lower pressing piece used for pressure riveting a workpiece to be processed; the lower die assembly includes: the die holder is provided with a positioning hole extending in the vertical direction, and a workpiece to be processed is inserted and installed in the positioning hole; the ejector rod comprises a lower disk part and an ejector rod part, and the ejector rod part is inserted into the positioning hole; the elastic part is used for elastically supporting the ejection part, and the ejection part can support the workpiece to be processed into an axial free moving state without external force; the upper die assembly further comprises a second pressing piece used for pressing the disc portion downwards, and a first vertical distance between the second pressing piece and the lower disc portion is smaller than a second vertical distance between the first pressing piece and the workpiece to be machined. The riveting die provided by the invention can avoid the simultaneous stress of two ends of the workpiece to be processed to a greater extent, and is more favorable for ensuring the processing quality of the workpiece.

Description

Pressure riveting die and pressure riveting equipment

Technical Field

The invention relates to the technical field of machining, in particular to a pressure riveting die and pressure riveting equipment.

Background

Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a riveting die in the prior art.

As shown in fig. 1, a conventional riveting die for a shaft workpiece 03 comprises an upper die assembly 01 and a lower die assembly 02, wherein the upper die assembly 01 has a lower pressing head 011, the lower die assembly 02 comprises a bottom beam 021, an intermediate plate 022 and a bottom plate 023 which are stacked from top to bottom, a first groove 021a is formed in the bottom beam 021, and a discharge spring 021b is formed in the first groove 021 a; a die holder 024 is arranged above the bottom beam 021, the die holder 024 is provided with a positioning hole 024a extending in the vertical direction, and the shaft workpiece 03 can be inserted into the positioning hole 024a and is abutted against the upper end of the die holder 024 by a shaft shoulder; the lower part of the die holder 024 is provided with a second groove 024b, the second groove 024b is communicated with the positioning hole 024a, the ejector rod 025 comprises a lower disk part 025a and an ejector rod part 025b, the lower disk part 025a is arranged in the second groove 024b, and the ejector rod part 025b can be inserted into the positioning hole 024a from bottom to top.

The discharging spring 021b has the effect that after the pressure riveting is finished, the ejector rod part 025b of the ejector rod 025 generates upward propping force on the shaft workpiece 03, so that the shaft workpiece 03 becomes a free-moving state in the axial direction, and the shaft workpiece 03 can be conveniently taken out. Therefore, when the workpiece is mounted, the discharge spring 021b needs to be compressed and accumulate a large elastic force to push the shaft-like workpiece 03 during discharging, but the ejector pin 025 is in a state of pushing the shaft-like workpiece 03 upward at that time.

Therefore, when pressure riveting is performed, the shaft workpiece 03 not only needs to bear the downward pressure riveting force of the lower pressure head 011, but also needs to bear the upward ejection force of the ejector rod 025, so that the bending deformation of the shaft workpiece 03 is easily caused, and the processing quality of the shaft workpiece 03 is affected.

Therefore, how to provide a solution to overcome the above-mentioned drawbacks remains a technical problem to be solved by those skilled in the art.

Disclosure of Invention

The invention aims to provide a press riveting die and press riveting equipment, wherein the press riveting die can greatly avoid the simultaneous stress of two ends of a workpiece to be processed, and is more favorable for ensuring the processing quality of the workpiece.

In order to solve the technical problem, the invention provides a press riveting die which comprises an upper die assembly and a lower die assembly, wherein the upper die assembly comprises a first lower pressing piece used for press riveting a workpiece to be processed; the lower die assembly includes: the die holder is provided with a positioning hole extending in the vertical direction, and a workpiece to be processed can be inserted and installed in the positioning hole; the ejection part comprises a lower disc part and an ejector rod part, and the ejector rod part is inserted into the positioning hole; the elastic part is used for elastically supporting the material ejecting part, and the ejector rod part can prop the workpiece to be processed into an axial free moving state under the action of no external force; the upper die assembly further comprises a second pressing piece used for pressing the lower disc portion downwards, and a first vertical distance between the second pressing piece and the lower disc portion is smaller than a second vertical distance between the first pressing piece and the workpiece to be machined.

By adopting the structure, when the press riveting operation is carried out, the second pressing piece of the upper die assembly which is pressed downwards can be abutted against the lower disc part of the ejection piece firstly, and the disc part is pressed downwards, so that the ejection rod part is released from abutting fit with the workpiece to be processed, and then the first pressing piece can be contacted with the workpiece to be processed. Therefore, the situation that the axial two ends of the workpiece to be processed are stressed simultaneously and are bent during riveting operation can be avoided to a greater extent, so that the elastic force generated by the elastic piece only acts on the workpiece to be processed during unloading, and the processing quality can be ensured.

Optionally, the die holder is mounted on the base, and two ends of the elastic member respectively abut against the base and the lower disc portion.

Optionally, the base is provided with a groove, and the elastic member is mounted in the groove.

Optionally, a guide structure is further disposed between the lower tray part and the base to guide the lifting of the material pushing part.

Optionally, the guide structure includes a guide member and a guide hole, one of the guide member and the guide hole is disposed on the base, the other is disposed on the lower disk portion, and the guide member can be inserted into the guide hole.

Optionally, the base comprises a seat plate, a base plate and a bottom plate which are fixedly connected from top to bottom, the bottom plate is provided with a through hole, the base plate is provided with the guide hole, the seat plate is provided with a mounting hole, the mounting hole is matched with the base plate to form the groove, and the hole diameters of the mounting hole and the through hole are larger than those of the guide hole; the guide piece is a guide screw, the guide screw comprises a head and a rod part, the rod part comprises a polished rod section and a threaded section, the threaded section is relatively far away from the head, the rod part can penetrate through the via hole, the guide hole and the mounting hole, the threaded section is connected with the lower disc part, the polished rod section is located in the guide hole, and the radial size of the head part is larger than that of the guide hole and smaller than that of the via hole.

Optionally, an upward concave part is arranged at the lower end of the die holder, and the positioning hole is communicated with the concave part; the material ejecting part is arranged on the depressed part, the lower disc part can extend out of the depressed part along the transverse direction, and the second lower pressing part can abut against the part of the lower disc part extending out of the depressed part.

Optionally, the number of the second pressing pieces is multiple, each of the second pressing pieces is divided into at least two groups, and the two groups of the second pressing pieces are respectively disposed at two lateral sides of the die holder.

The invention also provides a press riveting device which comprises a press riveting die, wherein the press riveting die is the press riveting die.

Since the above-mentioned press-riveting mold has the technical effects, the press-riveting apparatus having the press-riveting mold also has similar technical effects, and therefore, the detailed description thereof is omitted here.

Drawings

FIG. 1 is a schematic structural view of one embodiment of a prior art clinching die;

FIG. 2 is a schematic structural view of a press riveting mold provided by the present invention before press riveting operation;

FIG. 3 is a schematic structural view of a press riveting die provided by the present invention during a press riveting operation;

FIG. 4 is a schematic structural view of a clinch die provided by the present invention when the upper die assembly is initially opened;

fig. 5 is a schematic structural view of the clinch die provided by the invention when the upper die assembly is continuously opened.

The reference numerals in fig. 1 are explained as follows:

01 upper die assembly, 011 first lower pressing piece;

02 lower die component, 021 bottom beam, 021a first groove, 021b discharging spring, 022 middle plate, 023 bottom plate, 024 die holder, 024a positioning hole, 024b second groove, 025 ejector rod, 025a lower disk part and 025b ejector rod part;

03 shaft type workpieces.

The reference numerals in fig. 2-5 are illustrated as follows:

1, an upper die assembly, 11a first lower pressing piece and 12 a second lower pressing piece;

2, lower die assembly, 21 base, 211 seat plate, 211a mounting hole, 212 backing plate, 213 bottom plate, 213a via hole, 22 die holder, 221 positioning hole, 222 concave part, 23 ejection part, 231 lower disk part, 232 ejection rod part, 24 elastic part and 25 guide screw;

3, a workpiece to be processed;

h1 first vertical distance, H2 second vertical distance.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

The terms "first", "second", and the like, as used herein, are used for convenience only to describe two or more structures, components, or technical features that are the same or similar in structure, and do not denote any particular limitation on the order.

Referring to fig. 2 to 5, fig. 2 is a schematic structural view of a press-riveting die before press-riveting operation, fig. 3 is a schematic structural view of the press-riveting die during press-riveting operation, fig. 4 is a schematic structural view of the press-riveting die during initial opening of an upper die assembly, and fig. 5 is a schematic structural view of the press-riveting die during continued opening of the upper die assembly.

As shown in fig. 2, the invention provides a press riveting die, which includes an upper die assembly 1 and a lower die assembly 2, wherein a workpiece 3 to be processed can be supported and positioned on the lower die assembly 2, the upper die assembly 1 has a first lower pressing member 11, and the first lower pressing member 11 is a lower pressing head in the prior art and is used for performing press riveting operation on the workpiece 3 to be processed. The workpiece 3 to be machined is mainly a shaft-type workpiece.

Different from the prior art, the lower die assembly 2 includes: a die holder 22 provided with a positioning hole 221 extending in the vertical direction, and the workpiece 3 to be processed can be inserted into the positioning hole 221; the jacking part 23 comprises a lower disc part 231 and a jacking rod part 232, and the jacking rod part 232 can be upwards inserted into the positioning hole 221; the elastic part 24 is used for elastically supporting the jacking part 23, and when no external force acts, the jacking part 232 can jack the workpiece 3 to be processed into an axial free moving state (a state that the workpiece can be directly taken out); the upper die assembly 1 further comprises a second pressing member 12 for pressing the disk portion downward, and a first vertical distance H1 between the second pressing member 12 and the lower disk portion 231 is smaller than a second vertical distance H2 between the first pressing member 11 and the workpiece 3 to be processed.

Here, the first vertical distance H1 is a distance between the lower end surface of the second hold-down member 12 and the upper surface of the lower disk 231, and the second vertical distance H2 is a distance between the lower end surface of the first hold-down member 11 and the upper end surface of the workpiece 3 to be machined.

By adopting the structure, when the rivet pressing operation is performed, the second pressing piece 12 of the upper die assembly 1 which is pressed downwards can firstly abut against the lower disc 231 of the ejection piece 23 and press down the lower disc 231, so that the ejector rod part 232 is released from abutting fit with the workpiece 3 to be processed, and then the first pressing piece 11 can be contacted with the workpiece 3 to be processed.

Therefore, the situation that the axial two ends of the workpiece 3 to be processed are stressed simultaneously and are bent during riveting operation can be avoided to a greater extent, so that the elastic force generated by the elastic part 24 only acts on the workpiece 3 to be processed during unloading (or in an initial state), and the processing quality can be ensured.

In one embodiment, the mold may further include a base 21, the mold seat 22 may be installed on the base 21, and both ends of the elastic member 4 may respectively abut against the base 21 and the lower disc 231. In another scheme, the base 21 and the die holder 22 may also be an integral structure, in this case, it may be understood that only the die holder 22 exists (i.e., the base 21 is not included), the upper end portion of the die holder 22 may be provided with the positioning hole 221, the lower end portion may be provided with an installation groove capable of communicating with the positioning hole 221, the ejector 23 may be inserted into the installation groove, and the ejector rod portion 232 enters the positioning hole 221 and abuts against the workpiece 3 to be processed, and the elastic member 24 may also be disposed in the installation groove to support the ejector 23.

Can know, above-mentioned two kinds of schemes do not all influence the technological effect of waiting to process 3 both ends of work piece atress simultaneously when avoiding the pressure riveting operation, so, when implementing, technical staff in the art all can adopt. Preferably, the base 21 and the die holder 22 may be separately arranged to facilitate the installation of the components.

By taking the existence of the base 21 as an example, the base 21 can be provided with a groove, the elastic member 24 can be a spring and can be installed in the groove, the inner wall of the groove can guide the expansion direction of the spring to a certain extent, the radial play of the elastic member 24 during expansion and contraction can be avoided to a greater extent, and the situation that the elastic member 24 cannot be effectively pushed against the ejection member 23 due to the radial play can be avoided.

It should be understood that the elastic member 24 in the form of a spring is only an exemplary description of an embodiment of the present invention, and it is not intended to limit the scope of the implementation of the clinch mold provided by the present invention, and in the specific implementation, the elastic member 24 may also be an elastic element in various forms such as a bouncing ball and a bouncing block.

The number of the elastic members 24 may be one or more, and in the embodiment of the present invention, it is preferable to adopt a plurality of solutions to provide a larger discharging force for the ejector member 23; and when there are a plurality of elastic members 24, they may be spaced apart from each other on the base 21.

Here, the embodiment of the present invention does not limit the specific distribution form of the elastic members 24, and it is necessary to determine the distribution form in combination with the shape of the lower disc 231, and whatever distribution form is adopted, as long as it is ensured that the elastic force generated by each elastic member 24 can be uniformly applied to the ejector 23, so that the ejector 23 can be stably displaced up and down along the positioning hole 221; in the embodiment shown in the drawings, the lower plate 231 may be formed in an elongated plate shape, and in this case, the elastic members 24 may be equally spaced in the extending direction of the lower plate 231.

Further, a guiding structure may be further disposed between the lower disc portion 231 and the base 21 to guide the lifting direction of the ejector 23, so that the ejector part 232 of the ejector 23 can be stably lifted along the positioning hole 221.

In specific scheme, guide structure can include guide and guiding hole, and one of the two can set up in base 21, and the other can set up in lower plate portion 231, and the guide can peg graft in the guiding hole, and when liftout 23 goes up and down, the guide can slide in the guiding hole to carry out the direction to liftout 23.

As shown in fig. 2, from top to bottom, the base 21 may include a seat plate 211, a backing plate 212, and a bottom plate 213, which may be fixedly connected by a connector in the form of a screw or the like, or may be fixedly connected by welding or the like; the bottom plate 213 may be provided with a through hole 213a, the backing plate 212 may be provided with the aforementioned guide hole (not labeled), the seat plate 211 may be provided with a mounting hole 211a, the mounting hole 211a and the backing plate 212 may form the aforementioned groove (the backing plate 212 corresponds to the bottom wall of the groove), and the aperture of the mounting hole 211a and the aperture of the through hole 213a may be larger than the guide hole.

The guide member can be a guide screw 25, the guide screw 25 can comprise a head part and a rod part, the rod part can comprise a polished rod section and a threaded section, the threaded section is relatively far away from the head part, and the polished rod section is relatively close to the head part; during assembly, the rod portion can sequentially pass through the through hole 213a, the guide hole and the mounting hole 211a and is connected with the lower disc portion 231 by a threaded section, the polished rod portion can be located in the guide hole, and the outer diameter of the polished rod portion and the inner diameter of the guide hole can be substantially consistent, so that the ejector 23 can be guided by sliding fit of the polished rod portion and the guide hole.

In this embodiment, the head of the guide screw 25 may have a radial dimension larger than the guide hole and smaller than the through hole 213a, that is, the head of the guide screw 25 may be screwed into the through hole 213a to prevent the connector from being exposed. Meanwhile, the head-matching backing plate 212 can also lock the ejector 23 in the up-down direction, and the ejector 23 can only move up to the head of the guide screw 25 to abut against the backing plate 212 at most, so that the maximum moving-up stroke of the ejector 23 can be limited.

It should be noted that even if the head of the guide screw 25 does not abut against the backing plate 212, the die holder 22 (specifically, the top wall of the recess 222 hereinafter) will limit the upward movement of the ejector 23, and on the premise that the die holder 22 is reliably mounted, the ejector 23 can only move to the lower disc 231 at most to abut against the die holder 22. In other words, the specific size of the head of the guide screw 25 is not limited, and further, the guide screw 25 may also be a guide rod directly, and one end of the guide rod may be connected to the lower disk 231 by welding or the above-mentioned threaded connection, and thus the guide rod may also serve as a guide.

The spring can be arranged in the mounting hole 211a, one end of the spring can abut against the backing plate 212, the other end of the spring can abut against the lower disk portion 231, the spring can also be sleeved outside the guide screw 25, at this time, the guide screw 25 is also equivalent to a spring column to guide the extension and retraction of the spring by matching with the inner wall of the mounting hole 211a, and the radial play of the spring in the extension and retraction process can be avoided.

In the foregoing, the base 21 is a split structure including the seat plate 211, the backing plate 212 and the bottom plate 213, in fact, the base 21 may also be an integrated structure, in this case, a step hole may be provided on the base 21, and the step hole may include three hole sections, wherein the upper hole section corresponds to the mounting hole 211a, the middle hole section corresponds to the guiding hole, the lower hole section corresponds to the through hole 213a, and the guiding screw 25 (or the guiding rod) is further matched, so that similar technical effects as the split structure can be obtained.

Besides the above-mentioned matching structure of the guiding element and the guiding hole, the guiding structure may also adopt other structural forms, for example, the matching structure of the sliding element and the sliding chute, the sliding sleeve which is sleeved with the sliding sleeve, etc.

With respect to the clinch mold according to each of the above embodiments, the following embodiments of the present invention can also describe the abutting structure between the second presser 12 and the lower disk 231.

In one embodiment, the die holder 22 may be provided with a press hole (not shown) extending in the up-down direction, and the second press member 12 may pass through the press hole and abut against the lower disc portion 231 of the ejector 23. In this solution, the limitation on the connection structure between the ejector 23 and the die holder 22 is less, and the connection structure in the background art of fig. 1 may be adopted between the ejector 23 and the die holder 22, that is, the ejector 23 may be wholly located in the die holder 22, or alternatively, the connection structure shown in fig. 2 may be adopted between the ejector 23 and the die holder 22, and the lower disc portion 231 of the ejector 23 may partially extend out of the outer wall of the die holder 22, and the pressing of the second lower pressing member 12 against the lower disc portion 231 is not affected; furthermore, the press holes can also guide the lifting motion of the second press piece 12 to guide the direction of the press riveting.

In another alternative, as shown in FIGS. 2-5, the lower plate 231 can project laterally beyond the outer wall of the die holder 22, and the second lower member 12 can be positioned about the outer periphery of the die holder 22 and against the lower plate 231 of the protruding die holder 22. With this arrangement, the mounting position of the second press member 12 is not limited by the die holder 22, the die holder 22 can be relatively simple in structure, and the volume thereof can be set relatively small. The above description of the orientation of "lateral" is based on the orientation and position relationship in fig. 2, and in fig. 2, lateral means left-right direction.

Specifically, the lower end of the die holder 22 may be provided with an upward concave portion 222, and the ejector 23 may be mounted in the concave portion 222 and inserted into the positioning hole 221 through the ejector rod portion 232. In the embodiment of the present invention, a plurality of solutions are preferably adopted to provide a greater downward pressure to the lower disk portion 231; when there are a plurality of second pressing members 12, each of the second pressing members 12 may be divided into at least two groups, and the two groups of second pressing members 12 may be respectively disposed at two lateral sides of the die holder 22, so as to ensure uniformity of the pressing force of the second pressing members 12 borne by the lower disc portion 231 to a greater extent. In the embodiment shown in the drawings, the number of the second pressing members 12 may be two, and the two second pressing members 12 may be respectively disposed at two lateral sides of the die holder 22.

In comparison, the above two solutions can both achieve the abutment of the second pressing member 12 and the lower disk portion 231, but the latter solution has a simpler structure as a whole, and is a preferred solution of the embodiment of the present invention, and of course, the former solution is also an alternative solution in practical application.

For the ejector 23, the lower disc portion 231 and the push rod portion 232 may be of an integral structure or a split structure, and in fact, when the ejector is of a split structure, the push rod portion 232 may be directly installed from the upper portion of the positioning hole 221, so that the installation of the ejector 23 is not limited to the installation manner from bottom to top, the lower disc portion 231 may be directly inserted from the side portion of the die holder 22, the installation manner is more various, and the installation is easier.

Referring to fig. 2 again, before the clinching operation, the top rod portion 232 abuts against the lower end surface of the workpiece 3 to be processed due to the elastic force of the elastic member 24, but at this time, whether the bottom plate portion 231 abuts against the top wall of the recess portion 222 is related to the set elastic force of the elastic member 24. In a preferred embodiment, in an initial state, the lower disc 231 can abut against the top wall of the recess 222, and at this time, the elastic member 24 can still be in a compressed state, so as to ensure that the ejector rod 232 can generate a sufficient ejection force on the workpiece during unloading, and further eject the workpiece from the positioning hole 221, so that the shoulder of the workpiece can have a certain gap with the upper end of the die holder 22, and thus the workpiece can be in an axially freely movable state.

With reference to fig. 3-5, the specific working process of the clinch mold provided by the present invention can be referred to as follows:

in step S1, the upper die assembly 1 is moved down to make the second pressing member 12 abut against the lower disc portion 231 of the ejector 23, and the ejector 23 is pressed down to separate the ejector rod portion 232 from the workpiece 3 to be processed.

In step S2, the upper die assembly 1 is moved down continuously, and the first lower pressing member 11 can contact the upper end surface of the workpiece 3 to be processed, so as to formally start the clinching operation.

Here, whether or not the lower disc 231 abuts against the base 21 when the first lower pressing member 11 presses the upper end surface of the workpiece 3 to be processed is not limited, and may be, in particular, related to the length of the workpiece 3 to be processed, and the like, and in the embodiment of fig. 3, the lower disc 231 may abut against the base 21 when the first lower pressing member 11 presses.

In step S3, after the workpiece 3 to be machined is riveted and formed, the upper die assembly 1 starts to be lifted upward, the first lower pressing member 11 first separates from the upper end surface of the workpiece, and the ejector rod portion 232 starts to contact the lower end surface of the workpiece to prepare for the start of the ejection work.

In step S4, the upper die assembly 1 is lifted up, the second lower press-fitting member 12 is gradually separated from the lower disk 231, the elastic force of the elastic member 24 is gradually released, and the work is ejected and stays on the lower die assembly 2. At this time, the state of each component in the clinch mold provided by the present invention may be referred to fig. 2.

The invention also provides a press riveting device which comprises a press riveting die, wherein the press riveting die is the press riveting die related to each embodiment.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.

Claims

1. A press-riveting die comprising an upper die assembly (1) and a lower die assembly (2), the upper die assembly (1) having a first lower pressing member (11) for press-riveting a workpiece (3) to be processed, characterized in that the lower die assembly (2) comprises:

the die holder (22) is provided with a positioning hole (221) extending in the vertical direction, and the workpiece (3) to be processed can be inserted into the positioning hole (221);

the ejection part (23) comprises a lower disc part (231) and an ejector rod part (232), and the ejector rod part (232) is inserted into the positioning hole (221);

the elastic part (24) is used for elastically supporting the material ejecting part (23), and the ejector rod part (232) can prop the workpiece (3) to be processed into an axial free moving state under the action of no external force;

the upper die assembly (1) further comprises a second lower pressing piece (12) used for pressing the lower disc portion (231) downwards, and a first vertical distance (H1) between the second lower pressing piece (12) and the lower disc portion (231) is smaller than a second vertical distance (H2) between the first lower pressing piece (11) and the workpiece (3) to be machined.

2. The mold for clinching according to claim 1, further comprising a base (21), wherein the mold holder (22) is mounted on the base (21), and two ends of the elastic member (4) respectively abut against the base (21) and the lower disk portion (231).

3. Clinch die according to claim 2, characterized in that the base (21) is provided with a recess in which the elastic element (24) is mounted.

4. The clinch die of claim 3, in which a guide structure is provided between the lower disc (231) and the base (21) to guide the lifting of the ejector (23).

5. Mold according to claim 4, characterized in that the guide structure comprises a guide element and a guide hole, one of which is arranged on the base (21) and the other is arranged on the lower disc (231), and the guide element can be inserted into the guide hole.

6. The rivet pressing die according to claim 5, characterized in that, from top to bottom, the base (21) comprises a seat plate (211), a backing plate (212) and a bottom plate (213), the base plate (213) is provided with a through hole (213a), the backing plate (212) is provided with the guide hole, the seat plate (211) is provided with a mounting hole (211a), the mounting hole (211a) can form the groove in cooperation with the backing plate (212), and the diameters of the mounting hole (211a) and the through hole (213a) are larger than the guide hole;

the guide piece is guide screw (25), guide screw (25) include head and pole portion, the pole portion includes polished rod section and screw thread section, the screw thread section is kept away from relatively the head, the pole portion can pass via hole (213a), the guiding hole, mounting hole (211a), and with the screw thread section with lower dish portion (231) link to each other, polished rod section is located in the guiding hole, just the radial dimension of head is greater than the guiding hole, and is less than via hole (213 a).

7. The clinch die of claim 6, wherein the resilient member (24) is a spring disposed in the mounting hole (211a) and externally received by the guide screw (25).

8. The mold for clinch according to claim 2, wherein the lower end of the mold base (22) is provided with an upward recess (222), and the positioning hole (221) communicates with the recess (222);

the material ejecting part (23) is mounted on the recessed part (222), the lower disc part (231) can extend out of the recessed part (222) along the transverse direction, and the second lower pressing part (12) can abut against the part, extending out of the recessed part (222), of the lower disc part (231).

9. The mold for clinching according to claim 8, wherein the number of the second pressing members (12) is plural, each of the second pressing members (12) is divided into at least two groups, and when the number of the second pressing members is two, the two groups of the second pressing members (12) are respectively disposed on both lateral sides of the die holder (22).

10. A press riveting apparatus comprising a press riveting die, wherein the press riveting die is according to any one of claims 1-9.