Forming device of connecting nut, middleware and connecting nut

Abstract

The utility model provides a forming device of a connecting nut, a middleware and the connecting nut, the forming device comprises a cold header and a die assembly installed on the cold header, the die assembly comprises a first die and a second die, and the first die and the second die are used for conducting upsetting shaping on a preset blank twice to form a preset flange and a rod part connected to one end of the preset flange; the third mold is used for fixing the center forming head of one end, deviating from the rod part, of the preset flange; the fourth mold is used for forming the preset flange into a head flange; the fifth die is used for forming spline teeth on the outer wall of the rod part, enabling one end, deviating from the rod part, of the head flange to extend inwards to form a first blind hole, enabling one end, deviating from the head flange, of the rod part to extend inwards to form a second blind hole, and obtaining a middle piece of the connecting nut; the center of the bottom of the second blind hole protrudes outwards in the axial direction to form a protruding part. And the sixth die is used for separating waste located between the first blind hole and the second blind hole from a middle piece of the connecting nut, so that the first blind hole is communicated with the second blind hole to obtain an inner hole.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of fastener, especially relates to a forming device of connecting nut, intermediate piece and connecting nut. BACKGROUND

[0002] The nut is a kind of part that can connect mechanical equipment tightly, it is usually used with bolt to achieve the purpose of fastening parts, that is, by passing bolt into the through hole provided on the connected part, connecting nut is connected on the other end of bolt to fasten the part. At present, cold heading process or machining process is generally used to form nut, as shown in Figure 2 And Figure 3 A connecting nut 1 used in battery pack connection point, including head flange 12, rod portion 11 connected with head flange 12 and inner hole 13 through head flange 12 and rod portion 11 along the axial direction, wherein, the outer wall of rod portion 11 is also formed with flower tooth 14. In the prior art, cold heading die 6 is used to form flower tooth 14 after forming rod portion 11 and head flange 12 in turn, and then regular-shaped hole waste 3 (the waste part between first blind hole 21 and second blind hole 22, since second blind hole has no convex part 23 extending from the hole bottom to the outside, so the waste part 3 is regular cylindrical) is punched to form inner hole 13 through head flange 12 and rod portion 11, but since the blind hole part of flower tooth 14 is formed at the same time in the process of forming flower tooth 14, and the product wall thickness between the tooth end of flower tooth 14 and the hole wall of inner hole 13 is thin, so the flower tooth 14 part is not easy to form. At the same time, since the die includes die 6 and main die 5, which form a closed die cavity, there is no pressure relief space / pressure relief point, so the service life of the die is greatly shortened. CONTENT OF THE UTILITY MODEL

[0003] In view of the problems existing in the prior art, the main purpose of the utility model is to provide a forming device of connecting nut, intermediate piece and connecting nut, the forming device for forming connecting nut uses the fifth die of multi-station cold heading machine to form the flower tooth of the outer wall of rod portion, when the main die and die of the fifth die are relatively close to form flower tooth, the end of main die ejector pin towards the die is away from the end face of main die cavity opposite to main die ejector pin compared with the end of main die sleeve towards the die, so that the end of main die ejector pin and the part of main die sleeve protruding from the end of main die ejector pin jointly constitute a pressure relief space for die pressure relief, then the convex part formed in the pressure relief space is removed together with other parts of waste to form the inner hole of connecting nut, so that the service life of the fifth die can be effectively prolonged under the premise of ensuring the size of product.

[0004] The purpose of the utility model is realized by the following technical scheme:

[0005] The utility model provides a forming device of connecting nut, including cold header, and the mould assembly of installing on cold header, the mould assembly includes:

[0006] First mould, first mould is used for to the upsetting shaping of preset billet, forms first preset billet;

[0007] Second mould, second mould is used for to the upsetting shaping of first preset billet, forms preset flange and the rod portion connected to preset flange one end, the outer diameter of preset flange and the outer diameter of rod portion are same;

[0008] Third mould, third mould is used for making preset flange deviate from the center of one end of rod portion head part fixed point;

[0009] Fourth mould, fourth mould is used for making preset flange into head flange;

[0010] Fifth mould, fifth mould is used for making the outer wall of rod portion into flower tooth, and through head fixed point, head flange deviates from one end of rod portion and extends into first blind hole, and rod portion deviates from one end of head flange and extends into second blind hole, obtains the intermediate piece of connecting nut, the bottom center of second blind hole is formed with a convex portion along its axial direction;

[0011] Sixth mould, sixth mould is used for separating the waste material between first blind hole and second blind hole from the intermediate piece of connecting nut, so that first blind hole and second blind hole are communicated, and inner hole is obtained.

[0012] As the further description of above technical scheme, the forming device further includes shearing mechanism, and the shearing mechanism is used for cutting wire into preset billet.

[0013] As the further description of above technical scheme, the forming device further includes feeding mechanism, and the feeding mechanism is used for feeding between multiple moulds.

[0014] As the further description of above technical scheme, the first mould, second mould, third mould, fourth mould, fifth mould and sixth mould all include main mould and punch corresponding with main mould;

[0015] The main mould includes main mould shell, main mould cushion, main mould thimble and main mould core in the main mould shell, the main mould core has main mould cavity with opening towards punch, and main mould thimble is arranged along the axial direction and penetrates main mould cushion; main mould sleeve on main mould thimble is connected with the end face of main mould cushion towards punch, and main mould sleeve and main mould thimble all penetrate into main mould cavity from the bottom of main mould core;

[0016] The die includes a die shell, a die pad and a die ejector pin arranged in the die shell, the die ejector pin is connected with the die pad, and the other end of the die ejector pin penetrates through the die shell and is opposite to the main die cavity.

[0017] As further description of the above technical solution, when the main die and the die of the fifth die are relatively close to each other to close, the main die ejector pin included in the main die is away from the end face of the main die cavity opposite to the die ejector pin compared with the end of the main die sleeve facing the die.

[0018] The outer diameter of the front end of the main die sleeve of the fifth die extending into the main die cavity is equal to the hole diameter of the inner hole.

[0019] The utility model also provides a kind of intermediate piece of connecting nut, comprising:

[0020] Body, the body includes stem portion and the head flange connected to one end of the stem portion, the outer wall of the stem portion is equipped with multiple flower teeth;The first blind hole and the second blind hole are concentrically arranged along the axial direction of the body;Wherein,

[0021] The first blind hole is formed by the end face of the head flange away from the stem portion being recessed inward;The second blind hole is formed by the end face of the stem portion away from the head flange being recessed inward,

[0022] The bottom of the second blind hole is formed with a protrusion along the axial direction.

[0023] As further description of the above technical solution, the length of the protrusion along the axial direction is less than the hole depth of the second blind hole.

[0024] As further description of the above technical solution, the hole diameter of the first blind hole and the hole diameter of the second blind hole are the same.

[0025] The utility model also provides a kind of connecting nut, comprising:

[0026] Stem portion, the outer wall of the stem portion is equipped with multiple flower teeth;

[0027] Head flange, the head flange is connected to one end of the stem portion;The outer diameter of the head flange is greater than the stem portion.

[0028] Inner hole, the inner hole penetrates the stem portion and head flange along the axial direction.

[0029] Through the above technical solution, the utility model has the following prominent effects:

[0030] The forming device of the connecting nut forms the flower tooth of the outer wall of the rod part by the fifth die of the multi-station cold header, and when the main die and the punch die of the fifth die are relatively close to each other to form the flower tooth, the end of the main die ejector pin towards the punch die is away from the end face of the main die sleeve towards the punch die opposite to the punch die ejector pin and the main die cavity, so that the end of the main die ejector pin and the part of the main die sleeve protruding from the end of the main die ejector pin jointly constitute a force relief space for the die to relieve force, and then the protruding part formed in the force relief space is removed together with other waste parts to form the inner hole of the connecting nut, so that the service life of the fifth die can be effectively prolonged under the premise of ensuring the product size. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structure schematic view of the intermediate part of the connecting nut in the embodiment of the utility model;

[0032] Figure 2 It is a structure schematic view of the connecting nut in the embodiment of the utility model;

[0033] Figure 3 It is a cold heading product view of the connecting nut in the embodiment of the utility model;

[0034] Figure 4 It is an assembly view of the die assembly of each station in the embodiment of the utility model;

[0035] Figure 5 It is a partial structure schematic view of the fifth die in the embodiment of the utility model.

[0036] EXPLANATION OF DRAWINGS:

[0037] 1, connecting nut;11, rod part;12, head flange;13, inner hole;14, flower tooth;2, intermediate part;21, first blind hole;22, second blind hole;23, protruding part;3, waste;41, first die;42, second die;43, third die;44, fourth die;45, fifth die;46, sixth die;5, main die;51, main die ejector pin;52, main die cavity;53, main die sleeve;6, punch die;61, punch die ejector pin. DETAILED DESCRIPTION

[0038] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0039] In the description of the utility model, it is necessary to explain that the terms "upper", "middle", "lower", "inner", "outer", "front", "rear", "left", "right" and the like indicate the position or location relationship based on the position or location relationship shown in the drawing, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or component must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. For ordinary skilled persons in the art, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances. The embodiments will be described below according to the overall structure of the utility model.

[0040] The utility model will be described below in combination with the accompanying Figure 1 to the accompanying Figure 5 and embodiments.

[0041] The embodiment provides a forming device of connecting nut 1, including cold header (not shown in the drawing), and die assembly (not shown in the drawing) installed on the cold header, the die assembly includes:

[0042] First die 41, the first die 41 is used to upset shaping for preset blank, forms first preset blank;

[0043] Second die 42, the second die 42 is used to upset shaping for first preset blank, forms preset flange and the rod portion 11 connected to one end of preset flange, the outer diameter of the preset flange and the outer diameter of the rod portion 11 are same;

[0044] Third die 43, the third die 43 is used to make the preset flange away from the center of one end of the rod portion 11 head portion fixed point;

[0045] Fourth die 44, the fourth die 44 is used to make the preset flange into head flange 12;

[0046] Fifth die 45, the fifth die 45 is used to make the outer wall of the rod portion 11 into flower tooth 14, and make the head flange 12 away from one end of the rod portion 11 inwardly extend out first blind hole 21 through the head fixed point, make the rod portion 11 away from one end of the head flange 12 inwardly extend out second blind hole 22, obtain the intermediate piece 2 of the connecting nut 1;The bottom center of the second blind hole 22 is outwardly convex along its axial direction and is formed with a convex portion 23;

[0047] A sixth die 46 is used to separate the waste material 3 between the first blind hole 21 and the second blind hole 22 from the intermediate piece 2 of the connecting nut 1, so that the first blind hole 21 and the second blind hole 22 are communicated, and an inner hole 13 is obtained.

[0048] Through the above structure, the preset blank is processed by the multi-station cold heading forming machine, and six dies and six punches are used: first, the preset blank obtained by cutting the wire is subjected to twice heading shaping by the first die 41 and the second die 42, so as to form a preset flange and a rod part 11 connected to one end of the preset flange, and the outer diameter of the preset flange is the same as the outer diameter of the rod part 11; then, a head positioning point is formed at the center of the end of the preset flange away from the rod part 11 by the third die 43; then, the preset flange is formed into the head flange 12 by the fourth die 44; then, the outer wall of the rod part 11 is formed into the flower teeth 14 by the fifth die 45, and the end of the head flange 12 away from the rod part 11 is recessed inward to extend out the first blind hole 21 through the head positioning point, and the end of the rod part 11 away from the head flange 12 is recessed inward to extend out the second blind hole 22, so that the intermediate piece 2 of the connecting nut 1 is obtained; in this step, a protrusion 23 is simultaneously formed at the bottom center of the second blind hole 22, and the protrusion 23 extends outward along the axial direction of the second blind hole 22, in other words, the protrusion 23 is formed due to the existence of the axial relief space in the closed die cavity of the fifth die 45 for forming the flower teeth 14 of the rod part 11, so that the full flower teeth 14 are formed on the outer wall of the rod part 11, which ensures the forming size of the flower teeth 14 and effectively prolongs the service life of the fifth die 45; then, the waste material 3 between the first blind hole 21 and the second blind hole 22 is separated from the intermediate piece 2 of the connecting nut 1 by the sixth die 46, so that the first blind hole 21 and the second blind hole 22 are communicated, and the inner hole 13 is obtained, so the protrusion 23 formed in the fifth die 45 is also removed as part of the waste material 3; finally, the preset connecting nut 1 obtained by cold heading is subjected to necessary heat treatment and electroplating processes, so that the finished connecting nut 1 is obtained.

[0049] Specifically, in the embodiment, the forming device further comprises a shearing mechanism (not shown in the figure), which is used to cut the wire into the preset blank.

[0050] Specifically, in the embodiment, the forming device further comprises a feeding mechanism (not shown in the figure), which is used to feed between the plurality of dies. The feeding mechanism is, for example, a clip.

[0051] Specifically, in the embodiment, the first mold 41, the second mold 42, the third mold 43, the fourth mold 44, the fifth mold 45 and the sixth mold 46 each include a main mold 5 and a punch 6 arranged correspondingly to the main mold 5. The main mold 5 includes a main mold shell, a main mold pad arranged in the main mold shell, a main mold ejector pin 51 and a main mold core, the main mold core has a main mold cavity 52 with an opening facing the punch 6, and the main mold ejector pin 51 is arranged in the main mold pad and is movable in the axial direction. A main mold sleeve 53 is arranged on the main mold ejector pin 51 and is connected to the end surface of the main mold pad facing the punch 6, and the main mold sleeve 53 and the main mold ejector pin 51 both pass into the main mold cavity 52 from the bottom of the main mold core. The punch 6 includes a punch shell, a punch pad arranged in the punch shell and a punch ejector pin 61 connected to the punch pad, and the other end of the punch ejector pin 61 passes out of the punch shell and is opposite to the main mold cavity 52.

[0052] Please refer to Figure 1 , Figure 4 and Figure 5 . Specifically, in the embodiment, when the main mold 5 and the punch 6 of the fifth mold 45 are relatively close to each other to form the flower tooth 14, the upper end of the main mold ejector pin 51 faces away from the lower end surface of the punch ejector pin 61 opposite to the main mold cavity 52, compared to the upper end of the main mold sleeve 53 facing the punch 6, so that the upper end surface of the main mold ejector pin 51 and the tube part of the main mold sleeve 53 protruding from the upper end surface of the main mold ejector pin 51 form a pressure relief space for the billet to flow into, so that after the flower tooth 14 forming the outer wall of the rod part 11, the second blind hole 22 has an additional protrusion 23 protruding outward along the axial direction, and the protrusion 23 is formed by flowing into the pressure relief space. Then, the sixth mold 46 is used to perform the punch waste material 3 step of the conventional process as shown in Figure 4 , and the protrusion 23 is removed synchronously, so that the inner hole 13 passing through the head flange 12 and the rod part 11 is formed. That is, an axial pressure relief space is added in the closed mold cavity formed by the punch 6 and the main mold 5 of the original fifth mold 45 for forming the flower tooth 14, so that the service life of the fifth mold 45 can be effectively prolonged under the premise of ensuring the size of the flower tooth 14. The outer diameter of the front (upper) end of the main mold sleeve 53 of the fifth mold 45 extending into the main mold cavity 52 is equal to the hole diameter of the inner hole 13, which also ensures the size of the hole diameter of the inner hole 13 of the connecting nut 1.

[0053] Please refer to Figure 1 . Specifically, the intermediate piece 2 of the connecting nut 1 provided in the embodiment includes:

[0054] The body comprises a rod part 11 and a head flange 12 connected to one end of the rod part 11, and a plurality of flower teeth 14 are arranged on the outer wall of the rod part 11; the body is provided with a first blind hole 21 and a second blind hole 22 concentrically along the axial direction thereof; wherein,

[0055] The first blind hole 21 is recessed inwardly from the end surface of the head flange 12 away from the rod part 11, and the second blind hole 22 is recessed inwardly from the end surface of the rod part 11 away from the head flange 12;

[0056] The bottom of the second blind hole 22 is outwardly convexly formed with a convex part 23 along the axial direction thereof.

[0057] Specifically, in the embodiment, the length of the convex part 23 along the axial direction is less than the hole depth of the second blind hole 22, and the ratio can be calculated and set according to the actual force leakage required by the mold.

[0058] Please refer to Figure 2 and Figure 3 Specifically, in the embodiment, the hole diameter of the first blind hole 21 is the same as the hole diameter of the second blind hole 22.

[0059] Specifically, the connecting nut 1 provided in the embodiment comprises:

[0060] The rod part 11, a plurality of flower teeth 14 are arranged on the outer wall of the rod part 11;

[0061] The head flange 12 is connected to one end of the rod part 11;

[0062] The outer diameter of the head flange 12 is greater than the rod part 11; the inner hole 13 penetrates through the rod part 11 and the head flange 12 along the axial direction.

[0063] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not limited to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it can still be modified to the technical solutions recorded in the foregoing embodiments, or equivalent replacement of some of the technical features, any change, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, shall be included in the protection scope of the present application.

Claims

1. A forming device for connecting a nut, characterized in that The application relates to a cold heading machine and a die assembly installed on the cold heading machine. The first die is used for heading shaping a preset blank to form a first preset blank; The second die is used for heading shaping the first preset blank to form a preset flange and a rod part connected to one end of the preset flange, and the preset flange has the same outer diameter as the rod part; The third die is used for forming a head part fixed point of the preset flange away from the center of one end of the rod part; The fourth die is used for forming the preset flange into a head flange; The fifth die is used for forming the outer wall of the rod part into a plurality of flower teeth, and extending a first blind hole outwards from the head flange away from one end of the rod part through the head part fixed point, and extending a second blind hole outwards from one end of the rod part away from the head flange, so that the intermediate part of the connecting nut is obtained; the bottom center of the second blind hole is outwardly protruded along the axial direction to form a protrusion. The sixth die is used for separating the waste material between the first blind hole and the second blind hole from the intermediate part of the connecting nut, so that the first blind hole and the second blind hole are communicated to obtain an inner hole.

2. The forming device of a connection nut according to claim 1, characterized in that The forming device further comprises a shearing mechanism for shearing a wire into the preset blank.

3. The forming device of a connection nut according to claim 1, characterized in that The forming device further comprises a feeding mechanism for feeding between a plurality of dies.

4. The forming device of a coupling nut according to claim 1, wherein The first die, the second die, the third die, the fourth die, the fifth die and the sixth die all comprise a main die and a punch die corresponding to the main die; The main die comprises a main die shell, a main die cushion block arranged in the main die shell, a main die ejector pin and a main die core, the main die core has a main die cavity with an opening facing the punch die, and the main die ejector pin is arranged in the main die cushion block in the axial direction; a main die sleeve sheathed on the main die ejector pin is connected to the end surface of the main die cushion block facing the punch die, and the main die sleeve and the main die ejector pin both penetrate into the main die cavity from the bottom of the main die core; The punch die comprises a punch die shell, a punch die cushion block and a punch die ejector pin arranged in the punch die shell, the punch die ejector pin is connected to the punch die cushion block, and the other end of the punch die ejector pin penetrates out of the punch die shell and is opposite to the main die cavity.

5. The forming device of a connection nut according to claim 4, characterized in that When the main die and the punch die of the fifth die are relatively close to each other during the die closing process, the end of the main die ejector pin facing the punch die is farther away from the end surface of the punch die opposite to the main die cavity than the end of the main die sleeve facing the punch die; The outer diameter of the front end of the main die sleeve penetrating into the main die cavity is equal to the hole diameter of the inner hole.

6. An intermediate piece for connecting a nut, characterized in that The application relates to a cold heading machine and a die assembly installed on the cold heading machine. The body comprises a rod part and a head flange connected to one end of the rod part, and a plurality of flower teeth are arranged on the outer wall of the rod part; the body is concentrically provided with a first blind hole and a second blind hole along the axial direction; wherein, The first blind hole is formed by recessing the end surface of the head flange away from the rod part; the second blind hole is formed by recessing the end surface of the rod part away from the head flange, The bottom center of the second blind hole is outwardly protruded along the axial direction to form a protrusion.

7. The intermediate nut of claim 6, wherein The convex portion has a length in the axial direction which is less than the hole depth of the second blind hole.

8. The intermediate nut of claim 6, wherein, The first blind hole has the same hole diameter as the second blind hole.

9. A coupling nut characterized by, Comprise: A rod portion, an outer wall of the rod portion being provided with a plurality of flower teeth; A head flange connected to one end of the rod portion; the head flange has an outer diameter greater than the rod portion; An inner hole penetrating through the rod portion and the head flange in the axial direction.

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