CN112387918A - Forming device and method for four-side positioning screws - Google Patents

Abstract

The invention discloses a forming device and a method for four-side positioning screws, wherein the device comprises: the fourth main die comprises a fourth main die shell, a first cushion block arranged in the fourth main die shell, a second cushion block arranged in the fourth main die shell and positioned above the first cushion block, a fourth main die core fixed on the second cushion block and a fourth main die ejector pin, the first cushion block is elastically connected with the second cushion block, the fourth main die core is used for placing a blank, a head flange of the blank positioned in the fourth main die core faces the fourth die, the fourth main die ejector pin sequentially penetrates through the first cushion block, the second cushion block and the fourth main die core, and the second cushion block can move in the direction facing the first cushion block when the fourth die and the fourth main die are in a die closing state, so that the rod part of the fourth main die ejector pin abuts against the blank. This scheme has saved equipment cost, process circulation cost, has improved advantages such as production efficiency.

Description

Forming device and method for four-side positioning screws

Technical Field

The invention relates to the technical field of cold heading dies, in particular to a forming device and method for four-side positioning screws.

Background

A four-sided set screw as shown in figures 1 and 2 has a head flange 11 of quadrilateral configuration. Generally, in the production process, the main structure of the screw is molded, and at the moment, the head flange 11 is circular; next, the circular head flange 11 is trimmed to form a quadrangular head flange 11.

Generally speaking, the more cost effective and efficient method for producing the above-described quadrilateral set screws is: when its major structure of cold-heading shaping, cut edge it through cold-heading mould. However, in a die mounted on a press apparatus, each part of a die and a main die has a certain stroke range when moving up and down, and when the dimension of a four-side set screw in the axial direction is short and exceeds the minimum length of a trimming part required by the die, a main die ejector pin moves up to the limit position without contacting the part, so that the trimming of the die is difficult, and only a process is added to perform individual trimming by using a specific trimming machine. This results in a reduction in production efficiency and an increase in cost.

Disclosure of Invention

In order to overcome the defects in the prior art, embodiments of the present invention provide a forming device and a forming method for a quadrilateral set screw, which are used to solve the above problems.

The embodiment of the application discloses: a molding apparatus for a four-sided set screw, the set screw including a head flange and a shank portion connected, the apparatus comprising:

the fourth die comprises a fourth stamping die and a fourth main die, the fourth stamping die comprises a fourth stamping die shell and a cutter arranged on the fourth stamping die shell, the fourth main die comprises a fourth main die shell, a first cushion block arranged in the fourth main die shell, a second cushion block arranged in the fourth main die shell and positioned above the first cushion block, a fourth main die core fixed on the second cushion block and a fourth main die ejector pin, the first cushion block is elastically connected with the second cushion block, the fourth main die core is used for placing the blank, the head flange of the blank positioned in the fourth main die core faces the fourth stamping die, the fourth main die ejector pin sequentially penetrates through the first cushion block, the second cushion block and the fourth main die core, the second cushion block can move in the direction of the first die core when the fourth stamping die and the fourth main die are in the stamping die state, and the second die core can move in the direction of the first die core when the fourth stamping die and the fourth main die are in the die closing state So that the fourth main die ejector pin is abutted against the rod part of the blank.

Specifically, the molding device further includes:

a first die for shaping a blank so that the blank has a first stem and a second stem, the first stem having a diameter greater than the second stem;

a second die for preforming the first rod of the blank into a head flange and forming an internal bore in the head flange, the second die further being for forming the second rod of the blank into a shank portion of the four-sided set screw;

a third die for shaping the head flange and the inner bore.

Specifically, the first cushion block and the second cushion block are connected by adopting a plurality of rectangular springs.

Specifically, the device further comprises a shearing mechanism for shearing the metal wire into the blank.

Specifically, the shearing mechanism is a shear or a shearing die.

Specifically, the device further comprises a clamp used for conveying the material parts among the first die, the second die, the third die and the fourth die.

Specifically, the first die comprises a first stamping die and a first main die, wherein the first stamping die comprises a first stamping die shell, a first stamping head arranged in the first stamping die shell and a first stamping die cushion block used for connecting the first stamping head and the press; the first main die comprises a first main die shell, a first main die core arranged in the first main die shell and a first main die ejector pin arranged in the first main die shell and the first main die core in a penetrating mode.

Specifically, the second die comprises a second stamping die and a second main die, wherein the second stamping die comprises a second stamping die shell, a second stamping die core arranged in the second stamping die shell, a second stamping die ejector pin arranged in the second stamping die shell and penetrating through the second stamping die core, and a second stamping die cushion block used for connecting the second stamping die ejector pin with the press; the second main mold core comprises a second main mold shell, a second main mold core arranged in the second main mold shell, and a second main mold thimble penetrating through the second main mold shell and the second main mold core.

Specifically, the third die block comprises a third die and a third main die, and the third die comprises a third die casing and a third die core arranged in the third die casing; the third main die comprises a third main die shell, a third main die core arranged in the third main die shell and a third main die ejector pin arranged in the third main die shell and the third main die core in a penetrating manner.

The embodiment of the application also discloses: a molding method for a four-sided set screw, the four-sided set screw including a head flange and a shank connected, comprising the steps of:

placing a blank with a head flange and a rod part connected with each other into a fourth die for trimming, wherein in the trimming process, the second cushion block can move in the direction towards the first cushion block, and an elastic element gives an acting force to the second cushion block in the direction away from the first cushion block, so that a fourth main die ejector pin is abutted against the rod part of the blank, wherein the fourth die comprises a fourth stamping die and a fourth main die, the fourth main die comprises a fourth main die shell, a first cushion block arranged in the fourth main die shell, a second cushion block arranged in the fourth main die shell and positioned above the first cushion block, and a fourth main die ejector pin, the first cushion block is elastically connected with the second cushion block, the fourth main die core is used for placing the blank, the fourth stamping die faces the head flange of the blank when the blank is positioned in the fourth main die core, and the fourth main die ejector pin sequentially penetrates through the first die, the second die core and the fourth main die core, A second cushion block and a fourth main die core.

The invention has at least the following beneficial effects:

in the molding device of this embodiment, the fourth main core of the fourth mold is configured to be capable of floating up and down, so as to solve the problem that when the length of the screw is too short, the head flange of the screw cannot be trimmed by the mold due to the fact that the fourth main core pin moves up to the limit position and cannot touch the bottom of the screw due to mechanical interference of the press equipment. The four-side positioning screw is prepared by the forming device of the embodiment, so that the process of independently trimming the head of the screw by using a trimming machine can be reduced, the equipment cost and the process flow cost are saved, and the production efficiency is improved.

In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a front view of the quadrilateral set screw in an embodiment of the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a schematic structural view of the molding apparatus according to the embodiment of the present invention;

FIG. 4 is a schematic representation of the station materials of the stations of the forming apparatus in an embodiment of the present invention.

Reference numerals of the above figures: 11. a head flange; 12. a rod portion; 13. an inner bore; 2. a blank; 21. a first lever; 22. a second lever; 3. a first mold; 31. a first die shell; 32. a first punch; 33. a first die pad; 34. a first main formwork; 35. a first main mold core; 36. a first main mold thimble; 4. a second mold; 41. a second die shell; 42. a second punching die core; 43. a second punch; 44. a second die pad; 45. a second main formwork; 46. a second main mold core; 47. a second main mold thimble; 5. a third mold; 51. a third die shell punching; 52. a third punching die core; 53. a third main formwork; 54. a third main mold core; 55. a third main die thimble; 6. a fourth mold; 61. a fourth die shell; 62. a cutter; 63. a fourth main mold core; 64. a first cushion block; 65. a second cushion block; 66. a fourth main mold core; 67. a fourth main die thimble; 68. a rectangular spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 and 2, the four-sided set screw of the present embodiment includes a head flange 11 and a shaft 12 connected to each other, and an inner hole 13 is further formed on the head flange 11.

Referring to fig. 3 and 4, the molding apparatus for the four-side set screw of the present embodiment may include a first mold 3, a second mold 4, a third mold 5, and a fourth mold 6.

The first die 3 may be used to shape the blank 2 such that the blank 2 has opposing first and second rods 21, 22, wherein the first rod 21 is used to shape the head flange 11 of the screw in a subsequent die and the second rod 22 is used to shape the shank 12 of the screw in a subsequent die, the first rod 21 having a larger diameter than the second rod 22.

The second die 4 may be used for processing the blank 2 after processing by the first die 3. The second die 4 pre-shapes the first shank 21 of the blank 2 into the head flange 11 of the screw and forms an internal bore 13 in the head flange 11, and the second die 4 also shapes the second shank 22 into the shank 12 of the screw. The second die 4 is adopted to perform the head flange 11 and the inner hole 13 on the blank 2, so that the sizes of the head flange 11 and the inner hole 13 of the screw can be guaranteed in the subsequent die cold heading process.

The third die 5 may be used for machining the blank 2 after machining the second die 4. The third die 5 is used to shape the head flange 11 and the inner bore 13 of the screw.

The fourth die 6 is used for performing head trimming on the blank 2 processed by the third die 5. The fourth die 6 includes a fourth die and a fourth main die that are fitted to each other, the fourth die and the fourth main die having a die-separating state and a die-closing state. The fourth die comprises a fourth die casing 61 and a cutter 62 arranged on the fourth die casing 61. The fourth main mold comprises a fourth main mold shell 63, a first cushion block 64 arranged in the fourth main mold shell 63, a second cushion block 65 arranged in the fourth main mold shell 63 and positioned above the first cushion block 64, a fourth main mold core 66 fixed on the second cushion block 65, and a fourth main mold thimble 67. The first cushion block 64 is elastically connected with the second cushion block 65, the fourth main mold core 66 is used for placing the blank 2 conveyed by the third mold 5, and the fourth main mold thimble 67 once penetrates through the first cushion block 64, the second cushion block 65 and the fourth main mold core 66 from bottom to top. The second block 65 is movable in the direction of the first block 64 when the fourth die and the fourth main die are in the closed state, so that the fourth main die ejector pin 67 abuts against the bottom of the blank 2, and the fourth die 6 can trim the head flange 11 of the blank 2.

With the above structure, in the molding apparatus of the embodiment, the fourth main mold core 66 of the fourth mold 6 is configured to be capable of floating up and down, so as to solve the problem that when the length of the screw is too short, the fourth main mold ejector pin 67 cannot touch the bottom of the screw even when moving up to the limit position due to mechanical interference of the pressing machine, so that the mold cannot perform trimming on the head flange 11 of the screw. The four-side positioning screw is prepared by the forming device of the embodiment, so that the process of independently trimming the head of the screw by using a trimming machine can be reduced, the equipment cost and the process flow cost are saved, and the production efficiency is improved.

Specifically, as shown in fig. 3, the first block 64 and the second block 65 may be connected by a plurality of rectangular springs 68. When the fourth die and the fourth main die of the fourth die 6 are in the die-splitting state, the top of the first cushion block 64 and the bottom of the second cushion block 65 are in the separated state, and when the fourth die and the fourth main die are in the die-splitting state, under the action of the fourth die, the second cushion block 65 moves towards the first cushion block 64, so that the blank 2 in the fourth die core also moves downwards to abut against the fourth main die thimble 67, and the cutter 62 can cut the edge of the head of the blank 2.

Specifically, the apparatus of the present embodiment may further include a cutting mechanism (not shown) for cutting the metal wire into the billet 2, and the cutting mechanism may be a scissors or a cutting die. Further, the apparatus of this embodiment may further include a gripper (not shown) for transferring the material between the plurality of molds, so as to facilitate the transfer of the material.

Specifically, as shown in fig. 3, the first mold 3 may include a first punch and a first master mold that are fitted to each other. The first die includes a first die housing 31, a first die ejector pin 32 disposed in the first die housing 31, and a first die pad 33 for connecting the first die ejector pin 32 and the press. The first main mold comprises a first main mold shell 34, a first main mold core 35 disposed in the first main mold shell 34, and a first main mold thimble 36 penetrating through the first main mold core 35 and the first main mold shell 34. The first die ejector pin 32 is used for pressing the blank 2 into the first die core, the first main die ejector pin 36 is used for matching with the first die ejector pin 32 to perform cold heading on the blank 2, and the first main die ejector pin 36 is further used for ejecting the blank 2 out of the first main die core 35 after the cold heading is finished.

Specifically, as shown in fig. 3, the second mold 4 includes a second punch and a second master that are fitted to each other. The second die includes a second die casing 41, a second die core 42 disposed in the second die casing 41, a second die ejector pin 43 disposed in the second die casing 41 and penetrating the second die core 42, and a second die pad 44 for connecting the second die ejector pin 43 and the press. The second main mold comprises a second main mold shell 45, a second main mold core 46 arranged in the second main mold shell 45, and a second main mold thimble 47 penetrating the second main mold shell 45 and the second main mold core 46. The second punch core 42 is used for the head flange 11 of the preformed screw, the second punch thimble 43 and the second main punch thimble 47 cooperate with each other to perform cold heading on the blank 2, the second punch thimble 43 is further used for ejecting the blank 2 out of the second punch core 42 after the cold heading is finished, and the second main punch thimble 47 is further used for ejecting the blank 2 out of the second main punch core 46 after the cold heading is finished.

With continued reference to fig. 3, the third mold 5 includes a third punch and a third master that cooperate with each other. The third die comprises a third die casing 51 and a third die core 52 arranged in the third die casing 51. The third main mold includes a third main mold shell 53, a third main mold core 54 disposed in the third main mold shell 53, and a third main mold thimble 55 disposed through the third main mold shell 53 and the third main mold core 54. In this mold, the head flange 11 of the screw is further shaped, and the thickness of the head flange 11 in this process is much smaller than that of the head flange 11 pre-formed in the second mold 4, that is, the thickness of the cavity of the third die core 52 is much smaller than that of the cavity of the second die core 42, so that a die ejector pin for ejecting the blank 2 from the third die core 52 may not be provided in the third mold 5.

The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (10)

1. A molding apparatus for a four-sided set screw, the four-sided set screw including a head flange and a shank portion that are connected, the apparatus comprising:

the fourth die comprises a fourth stamping die and a fourth main die, the fourth stamping die comprises a fourth stamping die shell and a cutter arranged on the fourth stamping die shell, the fourth main die comprises a fourth main die shell, a first cushion block arranged in the fourth main die shell, a second cushion block arranged in the fourth main die shell and positioned above the first cushion block, a fourth main die core fixed on the second cushion block and a fourth main die ejector pin, the first cushion block is elastically connected with the second cushion block, the fourth main die core is used for placing the blank, the head flange of the blank positioned in the fourth main die core faces the fourth stamping die, the fourth main die ejector pin sequentially penetrates through the first cushion block, the second cushion block and the fourth main die core, the second cushion block can move in the direction of the first die core when the fourth stamping die and the fourth main die are in the stamping die state, and the second die core can move in the direction of the first die core when the fourth stamping die and the fourth main die are in the die closing state So that the fourth main die ejector pin is abutted against the rod part of the blank.

2. The molding apparatus for quadrilateral set screws of claim 1, further comprising:

a first die for shaping a blank so that the blank has a first stem and a second stem, the first stem having a diameter greater than the second stem;

a second die for preforming the first rod of the blank into a head flange and forming an internal bore in the head flange, the second die further being for forming the second rod of the blank into a shank portion of the four-sided set screw;

a third die for shaping the head flange and the inner bore.

3. The molding apparatus for four sided set screws of claim 1, wherein the first block and the second block are connected using a plurality of rectangular springs.

4. The forming device for four-sided set screws of claim 1, further comprising a shearing mechanism for shearing a metal wire into the blank.

5. The molding apparatus for four-sided set screws of claim 4, wherein the shearing mechanism is a scissors or a shearing die.

6. The molding apparatus for four-sided set screws of claim 2, further comprising a clamp for material transfer between the first, second, third and fourth molds.

7. The forming device for the quadrilateral set screws of claim 2, wherein the first die comprises a first die and a first main die, the first die comprising a first die shell, a first punch disposed within the first die shell, and a first die pad for connecting the first punch to a press; the first main die comprises a first main die shell, a first main die core arranged in the first main die shell and a first main die ejector pin arranged in the first main die shell and the first main die core in a penetrating mode.

8. The forming device for the quadrilateral set screws according to claim 2, wherein the second die comprises a second punch die and a second main die, the second punch die comprises a second punch die shell, a second punch die core arranged in the second punch die shell, a second punch die ejector pin arranged in the second punch die shell and penetrating through the second punch die core, and a second punch die cushion block for connecting the second punch die ejector pin with the press; the second main mold core comprises a second main mold shell, a second main mold core arranged in the second main mold shell, and a second main mold thimble penetrating through the second main mold shell and the second main mold core.

9. The molding apparatus for four-side set screws of claim 2, wherein the third mold block comprises a third die and a third main mold, the third die comprises a third die casing and a third die insert disposed in the third die casing; the third main die comprises a third main die shell, a third main die core arranged in the third main die shell and a third main die ejector pin arranged in the third main die shell and the third main die core in a penetrating manner.

10. A molding method for a four-side set screw, which comprises a head flange and a rod part which are connected, is characterized by comprising the following steps:

placing a blank with a head flange and a rod part connected with each other into a fourth die for trimming, wherein in the trimming process, the second cushion block can move in the direction towards the first cushion block, and an elastic element gives an acting force to the second cushion block in the direction away from the first cushion block, so that a fourth main die ejector pin is abutted against the rod part of the blank, wherein the fourth die comprises a fourth stamping die and a fourth main die, the fourth main die comprises a fourth main die shell, a first cushion block arranged in the fourth main die shell, a second cushion block arranged in the fourth main die shell and positioned above the first cushion block, and a fourth main die ejector pin, the first cushion block is elastically connected with the second cushion block, the fourth main die core is used for placing the blank, the fourth stamping die faces the head flange of the blank when the blank is positioned in the fourth main die core, and the fourth main die ejector pin sequentially penetrates through the first die, the second die core and the fourth main die core, A second cushion block and a fourth main die core.

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