Cold heading die for thin plate nut with chamfer

Abstract

The utility model discloses a thin plate nut cold heading die with chamfers, which comprises a cold heading base, a plurality of cold heading stations are sequentially arranged on the cold heading base, die holders are arranged on the cold heading stations, punching rods are arranged on the front side and the rear side of each die holder, die core holes and fixing holes are arranged on the die holders, the die core holes face the punching rods, and the fixing holes face the punching rods. A plurality of mold cores are arranged in the mold core hole, a fixing seat is arranged in the fixing hole, the plurality of mold cores comprise a first mold core, a plurality of second mold cores and a third mold core, a first mold groove is formed in the first mold core, a second mold groove is formed in the second mold core, and a third mold groove is formed in the third mold core; the first die cavity, the second die cavity and the third die cavity are all provided with die holes, the fixing base is provided with through holes corresponding to the punching rods, and the die holes are communicated with the through holes, so that direct cold heading forming of chamfers on the part thin plate base is achieved, later machining forming is not needed, cost is reduced, and production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to cold heading die technical field, more specifically relates to a thin plate nut cold heading die with chamfer. BACKGROUND

[0002] As Figure 8 The thin plate nut shown in the T type includes a thin plate base and a nut column on the thin plate base, the nut column is provided with a threaded hole penetrating the thin plate base, the four corners are provided with chamfers, and the chamfer edges extend in the length direction of the thin plate base, that is, the angle between the chamfer edge and the long side of the thin plate base is smaller than the angle between the chamfer edge and the short side of the thin plate base, and in the prior art, the chamfer needs to be machined after the thin plate base is punched out, resulting in low production efficiency of parts. UTILITY MODEL CONTENTS

[0003] In view of the defects of the prior art, the utility model provides a thin plate nut cold heading die with chamfer, which realizes direct cold heading forming of the chamfer on the thin plate base of the part, does not need post-machining forming, reduces cost and improves production efficiency.

[0004] To achieve the above object, the utility model provides the following technical scheme: a thin plate nut cold heading die with chamfer, comprising a cold heading base, a plurality of cold heading stations are sequentially arranged on the cold heading base, a die holder is arranged on the cold heading station, punch rods are arranged on the front and back sides of the die holder, a die core hole and a fixing hole are arranged on the die holder, the die core hole faces the punch rod, a die core is arranged in the die core hole, a fixing seat is arranged in the fixing hole, a plurality of die cores include a first die core, a plurality of second die cores and a third die core, a first die groove is arranged on the first die core, a second die groove is arranged on the second die core, a third die groove is arranged on the third die core, and a die hole is arranged on the first die groove, the second die groove and the third die groove, a through hole corresponding to the punch rod is arranged on the fixing seat, and the die hole and the through hole are communicated.

[0005] Further, the second die core includes a bottom plate forming die core and a first supporting block, the second die groove is located on the bottom plate forming die core, the die hole is located on the first supporting block, and the first supporting block is located between the bottom plate forming die core and the fixing seat.

[0006] Further, the thickness of the plurality of second die grooves decreases sequentially, and the planar length and width dimensions increase sequentially.

[0007] Further, the third die core includes a bottom plate positioning die core and a second supporting block, the third die groove is located on the bottom plate positioning die core, the die hole is located on the second supporting block, and the second supporting block is located between the bottom plate positioning die core and the fixing seat.

[0008] Further, the mold core further comprises a cylindrical mold core, a mold base for mounting the cylindrical mold core is located at one side of the mold base for mounting the first mold core, a cylindrical hole is arranged on the cylindrical mold core, a third supporting block is arranged between the cylindrical mold core and the fixing base, a supporting hole is arranged on the third supporting block, and the cylindrical hole, the supporting hole and the fixing hole are in communication with each other.

[0009] Further, the cylindrical mold core comprises two cylindrical mold core blocks with different lengths.

[0010] Further, an end face punch rod is arranged on the punch rod corresponding to the first mold core, the punch rod passes through the end face punch rod, a groove is arranged on the end face punch rod towards the end face of the first mold core, and four inner walls of the groove are all inclined outwardly inclined surfaces, and a transition surface is arranged between adjacent two inclined surfaces.

[0011] Further, the mold core hole is a conical hole, and the mold core is in interference fit with the mold core hole.

[0012] Compared with the prior art, the beneficial effects of the utility model are that the blank is first punched by the cylindrical mold core to increase the diameter and reduce the length, then the first mold core and the plurality of second mold cores are sequentially used to form the thin plate base, and finally the hole on the nut column is punched out in the third mold core, so that the direct cold upsetting forming of the chamfer on the part thin plate base is realized, and the post-processing forming is not needed, the cost is reduced, and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figures 1 to 5 respectively are structure schematic diagrams of A-E mold bases in the thin plate nut cold upsetting mold with chamfers of the utility model;

[0014] Figure 6 is a process schematic diagram of a formed part in the thin plate nut cold upsetting mold with chamfers of the utility model;

[0015] Figure 7 is a structure schematic diagram of an end face punch rod corresponding to the first mold core in the thin plate nut cold upsetting mold with chamfers of the utility model;

[0016] Figure 8 is a structure schematic diagram of a part.

[0017] The drawing label: mold base 1;Mold core hole 2;Fixing hole 3;Fixing base 4;First mold core 5;Second mold core 6;Third mold core 7;First mold groove 8;Second mold groove 9;Third mold groove 10;Mold hole 11;Through hole 12;Bottom plate forming mold core 13;First supporting block 14;Bottom plate positioning mold core 15;Second supporting block 16;Cylindrical mold core 17;Cylindrical hole 18;Third supporting block 19;Supporting hole 20;End face punch rod 21;Inclined surface 22;Transition surface 23;Groove 24. DETAILED DESCRIPTION

[0018] In the description of the utility model, it is necessary to explain that, for the direction word, if the term "center", "transverse (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the utility model.

[0019] In addition, if the terms "first", "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the "first", "second" features can be explicitly or implicitly included one or more features, and in the description of the utility model, the meaning of "several", "several" is two or more than two, unless otherwise explicitly specified.

[0020] Referring to Figures 1 to 8 Further illustrate the utility model.

[0021] A thin plate nut cold heading die with chamfer, including cold heading base (the drawing is not shown), a plurality of cold heading stations are sequentially arranged on the cold heading base, the die holder 1 is arranged on the cold heading station, the die holder 1 is provided with punch bar (the drawing is not shown) on both sides, the die core hole 2 and the fixed hole 3 are arranged on the die holder 1, and the die core hole 2 faces the punch bar, the die core is arranged in the die core hole 2, the fixed seat 4 is arranged in the fixed hole 3, a plurality of die cores include first die core 5, a plurality of second die core 6 and third die core 7, the first die core 5 is provided with first die groove 8, the second die core 6 is provided with second die groove 9, the third die core 7 is provided with third die groove 10, and the first die groove 8, the second die groove 9 and the third die groove 10 are all provided with die hole 11, the fixed seat 4 is provided with through hole 12 corresponding to the punch bar, and the die hole 11 is communicated with the through hole 12.

[0022] As Figure 3 And Figure 4 As shown in the preferred embodiment, the second die core 6 includes a bottom plate forming die core 13 and a first support block 14, the second die groove 9 is located on the bottom plate forming die core 13, the die hole 11 is located on the first support block 14, and the first support block 14 is located between the bottom plate forming die core 13 and the fixed seat 4.

[0023] As Figure 3 And Figure 4As shown in the preferred embodiment, the thickness of the second mold groove 9 decreases in sequence, and the length and width of the plane increases in sequence.

[0024] As shown in the preferred embodiment, the third mold core 7 includes a bottom plate positioning mold core 15 and a second support block 16, the third mold groove 10 is located on the bottom plate positioning mold core 15, and the mold hole 11 is located on the second support block 16. Figure 5

[0025] As shown in the preferred embodiment, the mold core further includes a cylindrical mold core 17, the mold seat 1 mounting the cylindrical mold core 17 is located on one side of the mold seat 1 mounting the first mold core 5, the cylindrical mold core 17 is provided with a cylindrical hole 18, a third support block 19 is provided between the cylindrical mold core 17 and the fixed seat 4, the third support block 19 is provided with a support hole 20, and the cylindrical hole 18, the support hole 20 and the fixed hole 3 are in communication with each other. Figure 1

[0026] As shown in the preferred embodiment, the cylindrical mold core 17 includes two cylindrical mold core 17 blocks of different lengths. Figure 1

[0027] As shown in the preferred embodiment, the end face punch 21 is provided on the punch rod corresponding to the first mold core 5, the punch rod passes through the end face punch 21, the end face punch 21 is provided with a groove 24 on the end face of the first mold core 5, and the four inner walls of the groove 24 are all inclined outwardly inclined surfaces 22, and a transition surface 23 is provided between adjacent two inclined surfaces 22. Figure 7

[0028] In the preferred embodiment, the mold core hole 2 is a conical hole, and the mold core is in interference fit with the mold core hole 2.

[0029] As shown, A-E are the mold seat 1 structures at different stages of cold heading of different parts, wherein A is the cylindrical mold core 17 in the mold seat 1, B is the first mold core 5 in the mold seat 1, C and D are the second mold core 6 in the mold seat 1, the difference is that the thickness of the second mold groove 9 decreases in sequence, and the length and width of the plane increases in sequence, and E is the second cylindrical mold core 17 in the mold seat 1. Figures 1 to 5 The specific cold heading process is shown in the following figure:

[0030] Figure 6

[0031] Firstly, a blank a is cut from a wire, and then the blank a is put into the cylindrical mold core 17 of the mold seat 1, and the blank a in the cylindrical mold core 17 is extruded into a blank b by the punch rods at both ends, the blank b is shortened and the diameter is increased, and one end is used as a nut column of a part.

[0032] ​​​​​​Second step, the blank b is placed in the first mold core 5 of B mold base 1, the lower end of blank b is located in the mold hole 11 of the first mold core 5 and is in contact with the punch rod in the fixed base 4, the upper end is located in the first mold groove 8 of the first mold core 5, and the end face punch rod 21 is located above the first mold groove 8, then the punch rod and the end face punch rod 21 are extruded at the same time, so that the upper end of the blank b is extruded and deformed in the first mold groove 8 to form the blank c, at this time, the lower end of the blank c is used as a nut column, the upper end is formed into a square plate, and four inclined surfaces 22 corresponding to the end face punch rod 21 and a transition surface 23 connected between the four inclined surfaces 22 are arranged on the end face;

[0033] Third step, the blank c is placed in the second mold core 6 of C mold base 1, and the square plate of the blank c is located in the second mold groove 9 of the second mold core 6, and then the square plate is extruded to form a shape outside the square plate, the thickness of the bottom plate is reduced, and becomes a blank d;

[0034] Fourth step, the blank d is placed in the second mold core 6 of D mold base 1, so that the size of the thin plate base is further increased, and the thickness is further reduced to form the final bottom plate, at this time, the nut column is solid, and is blank e;

[0035] Fifth step, the blank e is placed in the bottom plate forming mold core 13 of the third mold core 7 of E mold base 1, the formed thin plate base is positioned and placed in the third mold groove 10, and the solid nut column is located in the mold hole 11 of the second support block 16, then the punch rod is used to punch holes on the nut column and the thin plate base to form the blank f, and the cold heading stamping of the part is completed.

[0036] The above multi-step stamping realizes the direct cold heading forming of the chamfer on the thin plate base of the part, without the need for post-processing forming, reduces the cost, and improves the production efficiency.

[0037] The above only describes the preferred embodiments of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any technical solutions falling within the concept of the present application shall fall within the protection scope of the present application. It should be noted that, for ordinary technical personnel in the technical field, some improvements and decorations without departing from the principles of the present application shall also be considered as the protection scope of the present application.

Claims

1. A thin plate nut cold heading die with chamfer, comprising a cold heading base, a plurality of cold heading stations are sequentially arranged on the cold heading base, a die holder is arranged on the cold heading station, a punch rod is arranged on the front and rear sides of the die holder, characterized in that: The mold base is provided with a mold core hole and a fixing hole, and the mold core hole faces the punch rod, the mold core hole is provided with a mold core, the fixing hole is provided with a fixing seat, a plurality of mold cores include a first mold core, a plurality of second mold cores and a third mold core, the first mold core is provided with a first mold groove, the second mold core is provided with a second mold groove, the third mold core is provided with a third mold groove, and the first mold groove, the second mold groove and the third mold groove are all provided with a mold hole, the fixing seat is provided with a through hole corresponding to the punch rod, and the mold hole and the through hole are communicated.

2. A thin plate nut cold upset die having a chamfer according to claim 1, characterized in that: The second mold core includes a bottom plate forming mold core and a first supporting block, the second mold groove is located on the bottom plate forming mold core, and the mold hole is located on the first supporting block.

3. A thin plate nut cold upset die having a chamfer according to claim 2, characterized in that: The thickness of the plurality of second mold grooves decreases in turn, and the length and width dimensions of the plane increase in turn.

4. The thin plate nut cold upset die with a chamfer according to claim 1, characterized in that: The third mold core includes a bottom plate positioning mold core and a second supporting block, the third mold groove is located on the bottom plate positioning mold core, and the mold hole is located on the second supporting block.

5. The thin plate nut cold upset die with a chamfer according to claim 1, characterized in that: The mold core further includes a cylindrical mold core, the mold base for installing the cylindrical mold core is located on one side of the mold base for installing the first mold core, the cylindrical mold core is provided with a cylindrical hole, a third supporting block is arranged between the cylindrical mold core and the fixing seat, the third supporting block is provided with a supporting hole, and the cylindrical hole, the supporting hole and the fixing hole are communicated with each other.

6. A thin plate nut cold upset die having a chamfer according to claim 5, characterized in that: The cylindrical mold core includes two cylindrical mold core blocks with different lengths.

7. The thin plate nut cold upset die with a chamfer according to claim 1, characterized in that: The punch rod corresponding to the first mold core is provided with an end face punch rod, the punch rod passes through the end face punch rod, the end face punch rod is provided with a groove on the end face of the first mold core, and the four inner walls of the groove are all inclined outwardly, and a transition surface is arranged between the two adjacent inclined surfaces.

8. The thin plate nut cold upset die with a chamfer according to claim 1, characterized in that: The mold core hole is a conical hole, and the mold core and the mold core hole are in interference fit.

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