CN213162898U - One-step shrinkage rod die for bolt cold heading forming processing - Google Patents
One-step shrinkage rod die for bolt cold heading forming processing Download PDFInfo
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- CN213162898U CN213162898U CN202021534297.7U CN202021534297U CN213162898U CN 213162898 U CN213162898 U CN 213162898U CN 202021534297 U CN202021534297 U CN 202021534297U CN 213162898 U CN213162898 U CN 213162898U
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Abstract
The utility model belongs to the technical field of machining, and relates to a first-order shrinkage rod die for bolt cold heading forming machining, which comprises a first-order straight-through die, a first-order shrinkage rod die and a first-order shrinkage rod die lower section, wherein the first-order straight-through die, the first-order shrinkage rod die and the first-order shrinkage rod die lower section are sequentially matched and connected from top to bottom and are positioned on the same central axis; the die sleeve of the first-order straight die, the die sleeve of the first-order rod-contracting die and the die sleeve of the lower section of the first-order rod-contracting die form a die cavity, the die cavity comprises a straight-through die cavity and a rod-contracting die cavity, the diameter of the straight-through die cavity is larger than that of the rod-contracting die cavity, the length of the straight-through die cavity is equal to that of the rod-contracting die cavity, and the length of the straight-through die cavity is 1/2 of the length of the; the length of the screw rod of the bolt is more than 70 mm; the first-order rod-reducing die also comprises a first-order upper stamping die; the sequence upper punching die is arranged above and aligned with the sequence straight-through die. The utility model has the advantages that the rod is contracted once, the resistance of the rod can be reduced, the bolt is prevented from bending, and the yield is improved; the requirement on raw materials is low, and the processing cost can be reduced.
Description
Technical Field
The utility model belongs to the technical field of machining, a preface draw back pole mould that is used for bolt cold-heading shaping to process is related to.
Background
For the full-thread products of M12 and M10, a large-caliber open-end reducing rod process (as shown in figure 1) is currently adopted, and the processing process comprises four steps of primary die punching, secondary reducing rod + head preforming, head forming and edge cutting. The first-order over-mold is a straight-through mold (shown in figure 2), raw materials only pass through the mold and are not deformed; however, in actual processing, when the length of the screw blank is greater than 70mm, the following problems occur if the surface of the raw material is poorly phosphated: because the length of the shrinkage rod is longer, the resistance of the shrinkage rod is large, the freely deformed part can be bent when the length of the screw blank is less than the processing length, normal processing cannot be realized, and defective products are easy to appear; to solve this problem, a method of improving the quality of raw material phosphating is generally adopted, but the material cost is high.
SUMMERY OF THE UTILITY MODEL
Aiming at the technical problems in the bolt processing, the utility model provides a one-step shrinkage rod die for the cold heading forming processing of the bolt, which performs one-step shrinkage rod, wherein the shrinkage rod is 1/2 of the length of the finished bolt screw; secondly, the rod is contracted; the resistance of the telescopic rod can be reduced, the bending of the bolt is avoided, and the yield is improved; the requirement on raw materials is low, and the processing cost can be reduced.
In order to realize the purpose, the utility model discloses a technical scheme is:
a first-order shrinkage rod die for cold heading forming machining of a bolt comprises a first-order straight-through die, a first-order shrinkage rod die and a first-order shrinkage rod die lower section, wherein the first-order straight-through die, the first-order shrinkage rod die and the first-order shrinkage rod die lower section are sequentially matched and connected from top to bottom and are positioned on the same central axis; the die sleeve of the first-order straight die, the die sleeve of the first-order rod-reducing die and the die sleeve of the lower section of the first-order rod-reducing die form a die cavity, the die cavity comprises a straight die cavity and a rod-reducing die cavity, and the diameter of the straight die cavity is larger than that of the rod-reducing die cavity.
Further, the length of the straight-through die cavity is equal to that of the shrinkage cavity.
Further, the length of the shrinkage cavity is 1/2 of the length of the bolt rod part.
Further, the length of the screw rod of the bolt is larger than 70 mm.
Furthermore, the first-order rod-reducing die also comprises a first-order upper stamping die; the sequence upper punching die is arranged above and aligned with the sequence straight-through die.
Further, the inner die cavities of the upper die in the sequence are aligned with the inner die cavities of the straight die in the sequence.
The utility model has the advantages that: the utility model adopts a first-order rod-contracting mould, and a first-order semi-closed rod, wherein the length of the first-order rod-contracting mould is 1/2 of the length of a finished bolt screw; the resistance of the telescopic rod can be effectively reduced, the free deformation part is prevented from bending, and the yield is increased; meanwhile, the requirement on the quality of raw materials is reduced, and the cost is reduced.
Drawings
FIG. 1 is a schematic view of a conventional cold heading process for a bolt;
FIG. 2 is a schematic view of a conventional rod-shrinking mold;
FIG. 3 is a schematic view of a first-order rod-retracting mold provided by the present invention;
fig. 4 is a schematic view of the first-order upper punch 1 of the present invention;
FIG. 5 is a schematic view of a two-stage rod-retracting mold;
FIG. 6 is a schematic view of the bolt cold heading process provided by the present invention;
wherein:
1-punching die in sequence; 2-a sequence of transition die upper section; 3-a first-order transition mold middle section; 4-a sequence of transition die lower section; 5-secondary upper punching die; 6-two-step rod shrinking die; 7-a sequence of through dies; 8-a rod shrinking die; 9-one-step shrinkage of the lower section of the rod die.
Detailed Description
The present invention will now be described in detail with reference to the accompanying drawings and examples.
Referring to fig. 1, the existing bolt cold heading forming process includes four steps, which are sequentially from left to right: a first step: performing overmoulding; the raw material passes through the die, and the bolt blank does not deform at all; a second step: shrinking a rod and preforming the head; the rod part is formed by one-time shrinkage rod, and the length of the shrinkage rod is equal to the length of the dry part of the final product bolt; simultaneously preforming the head of the bolt; a third step: forming a head; upsetting the preformed bolt head, and then engraving the thickness of the bolt head on the head mark; a fourth step: trimming; and (4) trimming the head of the bolt to finish the processing of the sizes of the opposite side and the opposite angle, so as to obtain the product bolt.
Referring to fig. 2, the conventional first-process through mold includes a first-process transition mold upper section 2, a first-process transition mold middle section 3, and a first-process transition mold lower section 4, which are coaxial and in transition fit with each other from left to right; three die sections of the first-order transition die upper section 2, the first-order transition die middle section 3 and the first-order transition die lower section 4 form a transition die cavity, a bolt blank is placed in the transition die cavity and directly passes through the die, raw materials are not deformed, and the diameter of a screw is not changed.
The existing process adopts one-time shrinkage rod, the length of the shrinkage rod is large, the resistance of the shrinkage rod is large, and the free deformation part is easy to bend; high requirements on raw materials and high cost.
Examples
Referring to fig. 3, the first-order shrinkage rod mold provided in this embodiment includes a first-order through mold 7, a first-order shrinkage rod mold 8, and a first-order shrinkage rod mold lower section 9, which are sequentially connected in a matching manner from top to bottom, and an inner mold cavity of the first-order through mold 7, an inner mold cavity of the first-order shrinkage rod mold 8, and an inner mold cavity of the first-order shrinkage rod mold lower section 9 form a semi-closed cavity. And the first-order straight-through die 7, the first-order rod-reducing die 8 and the first-order rod-reducing die lower section 9 are positioned on the same central axis; the die sleeve of the first-order straight die 7, the die sleeve of the first-order rod-reducing die 8 and the die sleeve of the lower section 9 of the first-order rod-reducing die form a die cavity, the die cavity comprises a straight die cavity and a rod-reducing die cavity, and the diameter of the straight die cavity is larger than that of the rod-reducing die cavity. The length of the straight-through die cavity is equal to that of the shrinkage rod die cavity; and are each 1/2 the length of the shank of the bolt. In one sequence, 1/2 lengths of screw were retracted through a rod-retracting cavity. And in the second sequence, the residual 1/2 length of the screw rod is contracted, the rod is contracted twice, the resistance is reduced, the requirement on raw materials is reduced, the head deformation stability is good, the defects are not easy to occur, the quality is ensured, the yield is improved, and the raw material cost is reduced.
Referring to fig. 4, the first-order rod-reducing die further includes a first-order upper punch 1; the upper punch 1 is placed above a sequence of through dies 7 and aligned with a sequence of through dies 7. The internal cavity of the upper punch 1 is aligned with the internal cavity of a series of through dies 7.
Referring to fig. 5, the second-step pin-reducing die includes a second-step upper punch 5 and a second-step pin-reducing die 6; the inner film cavity of the second-order upper punch die 5 is aligned and coaxial with the inner film cavity of the second-order rod-contracting die 6. When in use, the second-order upper punching die 5 moves downwards to push the blank to enter the second-order rod contracting die 6 for rod contracting; when the length of the blank telescopic rod reaches the length of the finished screw rod, the lower end surface of the blank is limited by a lower limiting thimble; and the upper punch 5 continues to descend in the second sequence, and upsetting is carried out on the head, so that the head preforming is completed.
Referring to fig. 6, when a bolt with a screw rod length of 80mm is to be machined, the first-order shrinkage rod die provided by the embodiment is adopted, so that the bolt cold heading forming process sequentially comprises the following steps from left to right:
1) one-step telescopic rod
By adopting the first-order shrinkage rod die provided by the embodiment, the first-order shrinkage rod is performed on the screw blank rod to be processed in the semi-closed cavity;
2) two-sequence shrinkage rod and head preforming
Performing secondary rod shrinkage on the unprocessed screw blank rod by adopting an opening rod shrinkage; simultaneously preforming the head of the screw blank rod to be processed of the first-order shrinkage rod to obtain a second-order shrinkage rod bolt with the preformed head;
3) head shaping
Further processing and molding the head of the two-sequence shrinkage rod bolt with the preformed head to obtain a preformed bolt;
4) edge cutting
And performing edge cutting treatment on the head of the preformed bolt to obtain the finished bolt.
In the embodiment, after the first-order rod shrinkage, the second-order rod shrinkage and the head pre-forming are completed by adopting the rod shrinkage and the head pre-forming; the head is formed by upsetting, and the upsetting ratio is 2.5; and finally, finishing trimming by adopting trimming treatment.
In the embodiment, the length of the screw rod of the bolt is 80mm, the length of the first-order shrinkage rod is 1/2 of the length of the screw rod of the finished bolt, namely 40mm, and the shrinkage rod is 40mm from the bottom of the screw rod to the head of the screw rod; and in the second step, an opening shrinkage rod is adopted, the length of the shrinkage rod in the second step is 1/2 (namely 40 mm) of the length of the finished bolt screw, and the shrinkage rod is continuously shrunk to the bolt head by 40mm from the position after the shrinkage rod in the first step.
In the embodiment, when the method of the embodiment is adopted for processing, the minimum upsetting ratio can reach 2.3, bending is not easy to occur during upsetting, an interlayer is not easy to occur on the head of a bolt, and the quality of the bolt is good.
According to the die provided by the embodiment, two-sequence shrinkage rods are adopted in the machining process, a semi-closed shrinkage rod is adopted in the first sequence, the length of the first-sequence shrinkage rod is 1/2 of the length of a finished bolt screw, and the first-sequence shrinkage rod shrinks from the bottom of a bolt to the head; secondly, opening shrinkage rods are adopted, the length of the second shrinkage rods is 1/2 of the length of the finished bolt screw, and the part of the first shrinkage rods, which is the shrinkage rods, continues to shrink the rods towards the head of the bolt; the rods are contracted twice, the resistance of each rod contraction is small, and the requirement on the quality of raw materials is low; the head deformation stability is good, the defects are not easy to occur, the quality is ensured, the yield is improved, and the raw material cost is reduced.
Claims (6)
1. An order shrinkage rod die for cold heading forming processing of a bolt is characterized by comprising an order straight-through die (7), an order shrinkage rod die (8) and an order shrinkage rod die lower section (9), wherein the order straight-through die, the order shrinkage rod die and the order shrinkage rod die lower section are sequentially matched and connected from top to bottom and are positioned on the same central axis; the die sleeve of the first-order straight die (7), the die sleeve of the first-order rod-reducing die (8) and the die sleeve of the lower section (9) of the first-order rod-reducing die form a die cavity, the die cavity comprises a straight-through die cavity and a rod-reducing die cavity, and the diameter of the straight-through die cavity is larger than that of the rod-reducing die cavity.
2. A progressive cavity die for cold heading forming of bolts as claimed in claim 1 wherein said through cavity has a length equal to the length of the cavity.
3. A progressive cavity die for cold heading forming of bolts as claimed in claim 2 wherein said cavity die has a length of 1/2 mm of the length of the shank of the bolt.
4. A progressive cavity die for cold heading forming of bolts as claimed in claim 3 wherein the length of the shank of said bolt is greater than 70 mm.
5. The progressive reduction die for cold heading forming of a bolt according to claim 4, further comprising a progressive upper punch (1); the first-order upper punch die (1) is arranged above the first-order straight-through die (7) and is aligned with the first-order straight-through die (7).
6. A set of shrinkage cavity dies for cold heading forming of bolts according to claim 5, wherein the internal cavity of the upper punch die (1) is aligned with the internal cavity of the through die (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021534297.7U CN213162898U (en) | 2020-07-29 | 2020-07-29 | One-step shrinkage rod die for bolt cold heading forming processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021534297.7U CN213162898U (en) | 2020-07-29 | 2020-07-29 | One-step shrinkage rod die for bolt cold heading forming processing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213162898U true CN213162898U (en) | 2021-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021534297.7U Active CN213162898U (en) | 2020-07-29 | 2020-07-29 | One-step shrinkage rod die for bolt cold heading forming processing |
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|---|---|
| CN (1) | CN213162898U (en) |
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2020
- 2020-07-29 CN CN202021534297.7U patent/CN213162898U/en active Active
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