Eccentric nut cold heading die

Abstract

The utility model discloses an eccentric nut cold heading die 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 formed in 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 holes, a fixing seat is arranged in the fixing hole, the mold cores comprise a plurality of eccentric mold cores, supporting blocks are arranged between the eccentric mold cores and the fixing seat, the supporting blocks are located in the mold core holes, and bottom plate forming holes are formed in the eccentric mold cores. A bottom plate forming groove is formed in the surface of the bottom plate forming hole and the surface of the supporting block, an eccentric positioning hole is formed in the supporting block, a through hole corresponding to the punching rod is formed in the fixing base, and the bottom plate forming hole, the eccentric positioning hole and the through hole are communicated with one another, so that cold heading forming of parts is achieved, later machining forming is not needed, cost is reduced, and production efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of cold heading mold technology, and more specifically relates to an eccentric nut cold heading mold. Background Technology

[0002] like Figure 7 The part shown includes a base plate and an eccentric column on the base plate. The eccentric column is provided with a threaded hole that penetrates the base plate. The center of the eccentric column does not coincide with the center of the base plate. Conventional cold heading dies cannot effectively press out the part directly. The eccentric column can only be eccentrically achieved by machining the base plate with a machine tool later, which is costly and inefficient. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a cold heading die for eccentric nuts, which eliminates the need for post-forming machining after forming, thereby reducing costs and improving production efficiency.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an eccentric nut cold heading mold, comprising a cold heading base, wherein a plurality of cold heading stations are sequentially arranged on the cold heading base, and a mold base is arranged on the cold heading stations. Punches are arranged on both the front and rear sides of the mold base. The mold base is provided with a mold core hole and a fixing hole, with the mold core hole facing the punch. A mold core is arranged in the mold core hole, and a fixing seat is arranged in the fixing hole. The plurality of mold cores include a plurality of eccentric mold cores. A support block is arranged between the eccentric mold core and the fixing seat. The support block is located in the mold core hole. A bottom plate forming hole is provided on the eccentric mold core. The bottom plate forming hole and the surface of the support block form a bottom plate forming groove. The support block is provided with an eccentric positioning hole. A through hole corresponding to the punch is provided on the fixing seat. The bottom plate forming hole, the eccentric positioning hole and the through hole are interconnected.

[0005] Furthermore, the plurality of eccentric mold cores include a first eccentric mold core, a second eccentric mold core, and a third eccentric mold core, wherein the bottom plate forming holes on the first eccentric mold core, the second eccentric mold core, and the third eccentric mold core successively increase in size, and the thickness of the bottom plate forming holes successively decreases.

[0006] Furthermore, a mold core pad is provided inside the mold core hole where the third eccentric mold core is installed, and the mold core pad is located between the support block and the fixed seat.

[0007] Furthermore, the mold cores also include a first cylindrical mold core and a second cylindrical mold core. Both the first cylindrical mold core and the second cylindrical mold core are provided with cylindrical holes. The mold base for installing the first cylindrical mold core is located on the same side as the mold base for installing the first eccentric mold core, and the mold base for installing the second cylindrical mold core is located on the same side as the mold base for installing the third eccentric mold core. The cylindrical holes, eccentric positioning holes and through holes are interconnected.

[0008] Furthermore, the first cylindrical mold core includes two cylindrical mold cores of different lengths.

[0009] Furthermore, the core hole is a conical hole, and the core and the core hole are interference-fitted.

[0010] Furthermore, the fixing seat is threadedly connected to the fixing hole.

[0011] Compared with the prior art, the beneficial effects of this utility model are: firstly, the blank is stamped once through a cylindrical die core to make its diameter larger and its length smaller, and then it is stamped and formed in sequence in the eccentric die core, and finally the hole on the eccentric column is punched out to realize the cold heading forming of the part, without the need for subsequent machining, reducing costs and improving production efficiency. Attached Figure Description

[0012] Figures 1 to 5 These are schematic diagrams of the AE mold base in the eccentric nut cold heading mold of this utility model;

[0013] Figure 6 This is a schematic diagram illustrating the process of forming the eccentric nut cold heading die of this utility model;

[0014] Figure 7 This is a structural diagram of the part.

[0015] Reference numerals: 1. Mold base; 2. Mold core hole; 3. Fixing hole; 4. Fixing seat; 5. Support block; 6. Base plate forming hole; 7. Eccentric positioning hole; 8. Through hole; 9. First eccentric mold core; 10. Second eccentric mold core; 11. Third eccentric mold core; 12. Mold core pad; 13. First cylindrical mold core; 14. Second cylindrical mold core; 15. Cylindrical hole. Detailed Implementation

[0016] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0017] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0018] Reference Figures 1 to 7 The present invention will be further described below.

[0019] An eccentric nut cold heading die includes a cold heading base (not shown in the attached drawing), on which a plurality of cold heading stations are arranged sequentially. A die base 1 is arranged on each of the cold heading stations. Punches (not shown in the attached drawing) are arranged on both the front and rear sides of the die base 1. The die base 1 is provided with a die core hole 2 and a fixing hole 3, with the die core hole 2 facing the punch. A die core is arranged in the die core hole 2. A fixing seat 4 is arranged in the fixing hole 3. The plurality of die cores include a plurality of eccentric die cores. A support block 5 is arranged between the eccentric die cores and the fixing seat 4. The support block 5 is located in the die core hole 2. A bottom plate forming hole 6 is provided on the eccentric die core. The bottom plate forming hole 6 and the surface of the support block 5 form a bottom plate forming groove. The support block 5 is provided with an eccentric positioning hole 7. A through hole 8 corresponding to the punch is provided on the fixing seat 4. The bottom plate forming hole 6, the eccentric positioning hole 7 and the through hole 8 are interconnected.

[0020] like Figures 2 to 4 As shown, in this example, preferably, the plurality of eccentric mold cores include a first eccentric mold core 9, a second eccentric mold core 10, and a third eccentric mold core 11. The bottom plate forming holes 6 on the first eccentric mold core 9, the second eccentric mold core 10, and the third eccentric mold core 11 increase in size sequentially, and the thickness of the bottom plate forming holes 6 decreases sequentially.

[0021] like Figure 4 As shown in this example, preferably, a mold core pad 12 is provided in the mold core hole 2 where the third eccentric mold core 11 is installed, and the mold core pad 12 is located between the support block 5 and the fixed seat 4.

[0022] like Figure 1 and Figure 5 As shown, in this preferred embodiment, the plurality of mold cores further include a first cylindrical mold core 13 and a second cylindrical mold core 14. Both the first cylindrical mold core 13 and the second cylindrical mold core 14 are provided with cylindrical holes 15. The mold base 1 for installing the first cylindrical mold core 13 is located on the same side as the mold base 1 for installing the first eccentric mold core 9, and the mold base 1 for installing the second cylindrical mold core 14 is located on the same side as the mold base 1 for installing the third eccentric mold core 11. The cylindrical holes 15, the eccentric positioning holes 7 and the through holes 8 are interconnected.

[0023] like Figure 1As shown in this example, preferably, the first cylindrical mold core 13 includes two cylindrical mold cores of different lengths.

[0024] In this example, preferably, the core hole 2 is a conical hole, and the core and the core hole 2 are interference-fitted.

[0025] like Figure 5 As shown, specifically, there is no support block between the second cylindrical mold core 14 and the fixed base 4, that is, the bottom surface of the second cylindrical mold core 14 directly contacts the fixed base 4, which facilitates the discharge of waste chips when punching the eccentric column.

[0026] like Figure 1 As shown in the example, in this preferred embodiment, the fixing seat 4 is threadedly connected to the fixing hole 3.

[0027] like Figures 1 to 5 As shown, A, B, and C represent the structures of the mold base 1 at different stages during the cold heading of different parts. Mold base 1 A contains the first cylindrical mold core 13, mold base 1 B contains the first eccentric mold core 9, mold base 1 C contains the second eccentric mold core 10, mold base 1 D contains the third eccentric mold core 11, and mold base 1 E contains the second cylindrical mold core 14.

[0028] The specific cold heading process is as follows: Figure 6 As shown:

[0029] The first step is to cut a section of blank a from the wire, and then put blank a into the first cylindrical mold core 13 of mold base A. The blank a in the first cylindrical mold core 13 is squeezed into blank b by the punches at both ends. Blank b becomes shorter and larger in diameter, and one end of it is used as the eccentric column of the part.

[0030] The second step is to place the blank b into the first eccentric mold core 9 of the B mold base 1. One end of the blank b abuts against the support block 5, and the other end extends out of the first eccentric mold core 9 due to its length. Then, the blank b is squeezed by the punches at both ends, so that the other end of the blank b outside the first eccentric mold core 9 is squeezed and deformed to form a bottom plate shape that matches the bottom plate forming hole 6 on the first eccentric mold core 9, and is transformed into blank c, which initially has the shape of the finished part.

[0031] The third step is to place the blank c into the second eccentric mold core 10 of the C mold base 1. After the bottom plate of the blank c is squeezed again, its length and width become larger and its thickness decreases. In addition, the side of the bottom plate that is far from the side of the eccentric column is compressed to form an inclined surface, which becomes the blank d.

[0032] The fourth step is to place the blank d into the third eccentric mold core 11 of the D mold base 1. The length and width of the base plate are further increased, while the thickness of the base plate is further reduced, forming the final base plate. At this time, the eccentric column is solid and is the blank e.

[0033] The fifth step is to place the blank e into the second cylindrical mold core 14 of the E mold base 1, and the eccentric column into its cylindrical hole 15. The bottom plate is in direct contact with the end face of the second cylindrical mold core 14. At this time, the bottom plate of the blank e and the end face of the eccentric column both have the stamping grooves left by the punches in the previous times. Then, the punches are aligned with the grooves to punch holes on the eccentric column to form the blank f, thus completing the cold heading stamping of the part.

[0034] The above-mentioned multi-step stamping process achieves cold heading of parts, eliminating the need for subsequent machining, reducing costs and improving production efficiency.

[0035] Specifically, the blank is transferred between mold bases 1 by grippers set on the cold heading base. For example, when blank b is transferred to mold base B, blank c, which was originally formed in mold base B, is simultaneously transferred to mold base C.

[0036] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A cold heading die for an eccentric nut, comprising a cold heading base, wherein a plurality of cold heading stations are sequentially arranged on the cold heading base, and a die holder is arranged on each cold heading station, wherein punches are arranged on both 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, with the mold core hole facing the punch. A mold core is provided in the mold core hole, and a fixing seat is provided in the fixing hole. The mold cores include a number of eccentric mold cores. A support block is provided between the eccentric mold core and the fixing seat. The support block is located in the mold core hole. A bottom plate forming hole is provided on the eccentric mold core. The bottom plate forming hole and the surface of the support block form a bottom plate forming groove. The support block is provided with an eccentric positioning hole. A through hole corresponding to the punch is provided on the fixing seat. The bottom plate forming hole, the eccentric positioning hole and the through hole are interconnected.

2. The eccentric nut cold heading die according to claim 1, characterized in that: The plurality of eccentric mold cores include a first eccentric mold core, a second eccentric mold core and a third eccentric mold core, wherein the bottom plate forming holes on the first eccentric mold core, the second eccentric mold core and the third eccentric mold core increase in size sequentially and the thickness of the bottom plate forming holes decreases sequentially.

3. The eccentric nut cold heading die according to claim 2, characterized in that: A mold core pad is provided inside the mold core hole where the third eccentric mold core is installed, and the mold core pad is located between the support block and the fixed seat.

4. The eccentric nut cold heading die according to claim 1, characterized in that: The mold cores also include a first cylindrical mold core and a second cylindrical mold core. Both the first cylindrical mold core and the second cylindrical mold core are provided with cylindrical holes. The mold base for installing the first cylindrical mold core is located on the same side as the mold base for installing the first eccentric mold core, and the mold base for installing the second cylindrical mold core is located on the same side as the mold base for installing the third eccentric mold core. The cylindrical holes, eccentric positioning holes and through holes are interconnected.

5. The eccentric nut cold heading die according to claim 4, characterized in that: The first cylindrical mold core includes two cylindrical mold cores of different lengths.

6. The eccentric nut cold heading die according to claim 1, characterized in that: The core hole is a conical hole, and the core and the core hole are interference-fitted.

7. The eccentric nut cold heading die according to claim 1, characterized in that: The fixing seat is threadedly connected to the fixing hole.

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