CN112317674A

CN112317674A - Brake caliper connecting nut and preparation device and preparation method thereof

Info

Publication number: CN112317674A
Application number: CN202011030505.4A
Authority: CN
Inventors: 林勇德; 许正俊; 路凤
Original assignee: Penn Engineering Automotive Fasteners Kunshan Co ltd
Current assignee: Penn Engineering Automotive Fasteners Kunshan Co ltd
Priority date: 2020-09-27
Filing date: 2020-09-27
Publication date: 2021-02-05

Abstract

The invention discloses a brake caliper connecting nut, a preparation device and a preparation method thereof, wherein the nut comprises a head flange and a rod part connected with the head flange, a plurality of linear straight teeth are arranged on the rod part, and an inner hole which penetrates through the head flange and the rod part along the axial direction is formed in the brake caliper connecting nut; the device comprises a first die, a second die, a fourth die, a fifth die and a sixth die, and the straight teeth of the nut can be formed on the rod part of the nut through the sixth die. This scheme has advantages such as improvement production efficiency and precision, reduction material cost.

Description

Brake caliper connecting nut and preparation device and preparation method thereof

Technical Field

The invention relates to the technical field of cold heading dies, in particular to a brake caliper connecting nut and a preparation device and a preparation method thereof.

Background

The brake caliper connecting nut is a nut used on an automobile brake system, is arranged on a brake caliper and is used for fixing the caliper on a brake frame so as to ensure that the caliper is firmly fixed on an automobile. The common preparation method of the existing brake caliper connecting nut comprises the following steps: the wire is first cold headed into a semi-finished product comprising a solid shank and a head connected thereto, and then the solid shank is knurled to form teeth. This method has the following disadvantages:

1. the method of forming the tooth part by knurling has the disadvantages of unstable size, poor precision, long processing time and low efficiency of the tooth part.

2. The stem portion is of a solid construction, which results in a waste of material.

Disclosure of Invention

In order to overcome the defects in the prior art, embodiments of the present invention provide a brake caliper coupling nut, and a manufacturing apparatus and a manufacturing method thereof, which are used to solve at least one of the above problems.

The embodiment of the application discloses: the utility model provides a brake caliper coupling nut's preparation facilities, brake caliper coupling nut include head flange and with head flange connection's pole portion, be equipped with the straight-tooth of a plurality of linear types in pole portion, brake caliper coupling nut is equipped with and link up along the axis direction head flange with the hole in pole portion, preparation facilities includes:

a first die for shaping a blank so that the blank has opposite first and second ends in an axial direction, and for forming a pre-pit on the first end of the blank;

a second die for back-extruding the pre-pits of the billet to form a pre-bore, and for pre-forming a fillet at a second end of the billet;

the fourth die is used for performing the head flange on the second end of the blank in a pre-forming mode and forming a concave hole in the head flange, and the fourth die is also used for performing the rod part of the nut in a pre-forming mode;

a fifth die for punching the blank having a head flange such that the pre-bore communicates with the recess bore, thereby forming the bore;

and the sixth die is used for shaping the head flange of the punched blank and forming a plurality of straight teeth on the rod part of the blank.

Specifically, the device further comprises a third die for upsetting the blank subjected to cold upsetting by the second die.

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

Specifically, the device further comprises a feeding mechanism, and the feeding mechanism is used for feeding materials among the plurality of dies.

Specifically, the feeding mechanism is a clip.

Specifically, the fourth mold is further configured to form a small rod at an end of the rod portion away from the head flange, and a diameter of the small rod is smaller than a diameter of the rod portion.

Specifically, the first mold, the second mold, the third mold, the fourth mold, the fifth mold and the sixth mold each include a punch and a master mold that are arranged opposite to each other.

The embodiment also discloses: the utility model provides a brake caliper coupling nut, including the head flange and with the pole portion of head flange connection, be equipped with the straight-teeth of a plurality of linear types in pole portion, brake caliper coupling nut is equipped with and link up along the axis direction the head flange with the hole in pole portion.

Specifically, one end, far away from the head flange, of the rod part is further provided with a small rod, and the diameter of the small rod is smaller than that of the rod part.

The embodiment of the application also discloses: the preparation method of the brake caliper connecting nut comprises a head flange and a rod part connected with the head flange, wherein a plurality of linear straight teeth are arranged on the rod part, the brake caliper connecting nut is provided with an inner hole which penetrates through the head flange and the rod part along the axis direction, and the preparation method comprises the following steps:

shaping a blank so that the blank has a first end and a second end opposite to each other along an axial direction, and forming a pre-pit on the first end of the blank;

backward extruding the pre-pit of the blank to form a pre-inner hole, and pre-forming a fillet at a second end of the blank;

performing a head flange on the second end of the blank in advance, forming a concave hole on the head flange, and performing a rod part of the nut on the first end of the blank in advance;

punching the blank with a head flange so that the pre-bore is in communication with the recess bore, thereby forming the bore;

and shaping the head flange of the punched blank, and forming a plurality of straight teeth on the rod part of the blank.

The invention has at least the following beneficial effects:

1. by adopting the mode that the straight teeth are formed on the rod part by the mold, the production efficiency and the production precision can be improved.

2. Compared with the mode of knurling straight teeth on the solid rod part in the prior art, the device of the embodiment can control the size of the inner hole through the structure such as the ejector pin in the die, so that when the die forms the straight teeth on the rod part, the size of the rod part can be ensured not to deform under the action of the ejector pin in the inner hole, namely, the shape and the size precision of the straight teeth on the outer wall of the rod part are ensured, therefore, the device of the embodiment can prepare the nut with the inner hole, the material is greatly saved, and the cost is reduced.

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 schematic structural view of a brake caliper coupling nut according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of station materials of each cold heading station in the preparation device in the embodiment of the invention;

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

Reference numerals of the above figures: 11. a head flange; 12. a rod portion; 13. straight teeth; 14. an inner bore; 15. a small rod; 2. a blank; 21. a first end; 22. a second end; 23. pre-pit; 24. pre-forming an inner hole; 25. concave holes; 31. a first mold; 32. a second mold; 33. a third mold; 34. a fourth mold; 35. a fifth mold; 36. a sixth mold; 301. punching a mould shell; 302. punching a thimble; 303. punching a cushion block; 304. a main formwork; 305. a main mold core; 306. a main die thimble; 307. and (5) a main die cushion block.

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, the brake caliper coupling nut of the present embodiment includes a head flange 11 and a rod portion 12 coupled to the head flange 11, and the rod portion 12 is provided with a plurality of straight teeth 13 of a straight line type. The nut is also provided with an inner hole 14 which passes through the head flange 11 and the stem 12 in the opposite axial direction, and preferably, the inner hole 14 is coaxial with the head flange 11 and the stem 12. By adopting the scheme, the brake caliper connecting nut of the embodiment can greatly save raw materials and reduce the cost on the premise of meeting the working strength. Furthermore, one end of the rod part 12, which is far away from the head flange 11, can be provided with a small rod 15, the diameter of the small rod 15 is smaller than that of the rod part 12, the small rod 15 can be provided with no straight teeth 13, and the small rod 15 can play a role in guiding when being connected, so that the nut is convenient to install.

Referring to fig. 1 to 3, the manufacturing apparatus of the present embodiment includes: a first die 31, a second die 32, a fourth die 34, a fifth die 35, and a sixth die 36. Wherein the first die 31 is used for shaping the blank 2 so that the blank 2 has a first end 21 and a second end 22 which are oppositely arranged along the axial direction, and is also used for forming the pre-pit 23 on the first end 21 of the blank 2. The second die 32 is used for performing backward extrusion on the pre-pit 23 of the blank 2 to form the pre-inner hole 24 (so that the pre-pit 23 becomes the pre-inner hole 24); the second die 32 may also pre-round the second end 22 of the blank 2 in preparation for forming the head flange 11 at a later station. The fourth die 34 is used to preform the head flange 11 for the second end 22 of the blank 2 discharged from the third die 33 and to form a recess 25 in the head flange 11. The fourth die 34 also pre-forms the stem 12 of the nut. The fifth die 35 is used for punching the blank 2 with the head flange 11 so that the pre-inner hole 24 on the blank 2 is communicated with the concave hole 25, thereby forming the inner hole 14 penetrating through the head flange 11 and the rod part 12. The sixth die 36 is used to shape the head flange 11 of the punched blank 2 and also to form a plurality of straight teeth 13 on the stem portion 12 of the blank 2.

With the above structure, the device of the present embodiment has the following advantages:

1. by forming the straight teeth 13 on the rod portion 12 using the die, the production efficiency and the production accuracy can be improved.

2. Compared with the prior art in which the straight teeth 13 are knurled on the solid rod portion 12, the device of the present embodiment can control the size of the inner hole 14 by using a structure such as an ejector pin in a mold, so that when the mold forms the straight teeth 13 on the rod portion 12, the size of the rod portion 12 is not deformed under the action of the ejector pin in the inner hole 14, that is, the shape and the size accuracy of the straight teeth 13 on the outer wall of the rod portion 12 are ensured, and therefore, the device of the present embodiment can prepare the nut with the inner hole 14, thereby greatly saving materials and reducing cost.

Specifically, as shown in fig. 3, the first mold 31, the second mold 32, the fourth mold 34, the fifth mold 35, and the sixth mold 36 of the present embodiment each include a punch and a master mold that are movable up and down relative to each other to be fitted to each other. The punching die of each die can comprise a punching die shell 301, a punching die thimble 302 which is arranged in the punching die shell 301 and can move up and down, and a punching die cushion block 303 which is used for connecting the punching die thimble 302 with a press; the main mold of each mold may include a main mold shell 304, a main mold core 305 disposed within the main mold shell 304, a main mold pin 306 disposed within the main mold shell 304 and extending through the main mold core 305 to cooperate with the die pin 302 to cold-upset the blank 2, and a main mold block 307 disposed below the main mold pin 306.

Referring to fig. 2 and 3, the apparatus of the present embodiment may further include a third die 33, and after the blank 2 is discharged from the second die 32, the blank firstly passes through the third die 33 to be upset into a round drum shape, and then enters a fourth die 34 to be cold-headed. The third die 33 is also provided with a punch and a master die which are relatively movable up and down, and its main structure is substantially the same as the above five dies. Upsetting the blank 2 with the third die 33 may provide for further upsetting at a later station to preform the head flange 11. During upsetting of the blank 2 by the third die 33, the main die ejector pin 306 of the third die 33 extends into the preliminary inner hole 24 to protect the preliminary inner hole 24 from dimensional deformation of the preliminary inner hole 24.

Specifically, the apparatus of the present embodiment may further include a cutting mechanism (not shown) for cutting the metal wire into the blank 2, and the cutting mechanism may be a scissors or a cutting die. Further, the apparatus may further include a feeding mechanism (not shown) for feeding between the plurality of molds, and the feeding mechanism may be a clip.

In particular, the fourth die 34 is also used to form a small bar 15 at the end of the stem 12 of the blank 2 remote from the head flange 11.

In summary, the working process of the device of the embodiment is as follows: s1: after the metal wire is cut into the blank 2 by the cutting mechanism, the blank 2 is clamped into the first die 31 by the clamp, the die ejector pin 302 of the first die 31 moves to extend into the corresponding main die core 305 to shape the blank 2, so that the first end 21 and the second end 22 of the blank 2 are leveled, at the moment, the lower end of the blank 2 positioned in the first die 31 is the first end 21, the upper end is the second end 22, the first end 21 is provided with the pre-pit 23, and the pre-pit 23 can guide the blank 2 during backward extrusion at a rear station, so that better concentricity can be obtained.

S2: the blank 2 discharged from the first die 31 is gripped by a gripper and turned over and placed in the second die 32, and the first end 21 of the blank 2 positioned in the second die 32 is positioned above the second end 22. The die movement of the second die 32 back-extrudes the blank 2 to form the pre-inner bore 24 while the second end 22 of the blank 2 is pre-radiused in preparation for forming the head flange 11 at a later station.

S3: the blank 2 discharged from the second die 32 is gripped by a gripper and turned upside down and placed in the third die 33, and the second end 22 of the blank 2 located in the third die 33 is located above the first end 21. The third die 33 upset the blank 2 into a drum shape in preparation for the subsequent upset, in which process the main die ejector pin 306 of the third die 33 extends into the pre-inner bore 24 to protect it and prevent dimensional deformation of the pre-inner bore 24.

S4: the blank 2 discharged from the third die 33 is gripped with a gripper and placed in the fourth die 34, in which case the second end 22 of the blank 2 located in the fourth die 34 is located above the first end 21. The punch of the fourth die 34 moves downward to form the head flange 11 and the concave hole 25 on the head flange 11 on the blank 2, and the concave hole 25 can prevent the blank from being generated by the workpiece after punching at the post-station. In this station, the shank 12 and the small bar 15 of the nut are also formed simultaneously. During this process, primary mold pin 306 of fourth mold 34 also extends into pre-bore 24 to protect it from dimensional deformation of pre-bore 24.

S5: the blank 2 discharged from the fourth die 34 is gripped with a gripper and placed in the fifth die 35, the second end 22 of the blank 2 being located in the fifth die 35 being located above the first end 21. The fifth die 35 compresses the blank 2 and closes the die, after the spring on the main die is compressed, the main die ejector pin 306 punches off the redundant material between the pre-inner hole 24 and the concave hole 25 through the pre-inner hole 24, so that the pre-inner hole 24 and the concave hole 25 are communicated, and the inner hole 14 of the nut is formed.

S6: the blank 2 discharged from the fifth die 35 is gripped with a gripper and placed in the sixth die 36, the second end 22 of the blank 2 now being located in the sixth die 36 above the first end 21. The sixth die 36 shapes the previously preformed head flange 11 to meet the shape and dimensions required by the product, and at the same time, the sixth die 36 forms the straight teeth 13 on the stem 12 of the blank 2 by means of reducing extrusion. To this end, a cold heading of the nut can be obtained. And the cold heading piece can be subjected to post-treatment such as heat treatment, electroplating and the like according to the performance requirement of the nut.

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

1. The utility model provides a brake caliper coupling nut's preparation facilities, brake caliper coupling nut include head flange and with head flange connection's pole portion, be equipped with the straight-tooth of a plurality of linear types in pole portion, brake caliper coupling nut is equipped with and link up along the axis direction head flange with the hole in pole portion, its characterized in that includes:

2. The apparatus for preparing a brake caliper coupling nut of claim 1, further comprising a third die for upsetting the blank cold-upset by the second die.

3. The apparatus for preparing a brake caliper coupling nut of claim 1, further comprising a shearing mechanism for shearing a metal wire into said blank.

4. The apparatus of claim 1 further comprising a feed mechanism for feeding between the plurality of dies.

5. The apparatus of claim 4 wherein the feed mechanism is a clip.

6. The apparatus of claim 1, wherein the fourth mold is further configured to form a small rod at an end of the shank portion remote from the head flange, the small rod having a diameter smaller than a diameter of the shank portion.

7. The apparatus for manufacturing a brake caliper coupling nut according to claim 1, wherein the first, second, third, fourth, fifth and sixth molds each include a punch and a master mold that are oppositely disposed.

8. The utility model provides a brake caliper coupling nut, its characterized in that, including the head flange and with the pole portion of head flange connection, be equipped with the straight-teeth of a plurality of linear types in the pole portion, brake caliper coupling nut is equipped with and link up along the axis direction the head flange with the hole in pole portion.

9. The brake caliper coupling nut of claim 8 wherein said shank portion is further provided with a small shank at an end thereof remote from said head flange, said small shank having a diameter less than a diameter of said shank portion.

10. The preparation method of the brake caliper connecting nut comprises a head flange and a rod part connected with the head flange, wherein a plurality of linear straight teeth are arranged on the rod part, and the brake caliper connecting nut is provided with an inner hole which penetrates through the head flange and the rod part along the axis direction, and is characterized by comprising the following steps of: