CN108787979A - The big chamfering cold upsetting die of car of bolt and technique - Google Patents
The big chamfering cold upsetting die of car of bolt and technique Download PDFInfo
- Publication number
- CN108787979A CN108787979A CN201810975452.XA CN201810975452A CN108787979A CN 108787979 A CN108787979 A CN 108787979A CN 201810975452 A CN201810975452 A CN 201810975452A CN 108787979 A CN108787979 A CN 108787979A
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- bolt
- chamfered section
- main mould
- chamfering
- internal diameter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/08—Accessories for handling work or tools
- B21J13/14—Ejecting devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention discloses the big chamfering cold upsetting die of car of bolt and techniques, including main mould A and main mould B, the process of the main mould A is respectively equipped with through-hole, the through-hole includes the mandril accommodating cavity positioned at the forming cavity of front side and positioned at rear side before main mould B in the middle part of the main mould A and main mould B；It is equipped with the first chamfered section between the forming cavity and mandril accommodating cavity of the main mould A, the second chamfered section is equipped between the forming cavity and mandril accommodating cavity of the main mould B；The mold internal diameter of second chamfered section end is not less than the 50% of bolt diameter, and the mold internal diameter of first chamfered section end is the 40%-50% of the sum of second chamfered section end internal diameter and bolt diameter.The present invention realizes big chamfering structure by two-part chamfering, can remove turning process from, avoid bolt shank length from changing, avoid burn failure, save time and production cost.
Description
Technical field
The invention belongs to technical field of bolt processing, and in particular to a kind of big chamfering cold upsetting die of car of bolt and technique.
Background technology
Standard bolt screw thread chamfer is all according to the requirement of GB/T 2, and screw thread chamfer is all smaller, can be by cold
Upsetting one-pass molding.With the development of technology, it is oriented to for the ease of component assembly and preferably, needs the end of thread for increasing bolt
Chamfering, by end of thread chamfer design at the big chamfering of original at least 2 times or more (generally can be 3 times or so).In the prior art
The big chamfering of the end of thread is realized by secondary turning processing after generally use bolt cold-heading, however can additionally increase process in this way,
Improve time and the production cost of bolt processing.If not using turnery processing, if directly carrying out big chamfering to bolt
Also can encounter many problems, for example, can because chamfering is excessive be more than due to fail, be also likely to cause bolt shank length shorten and
Length differs, and the shape at chamfering is also more ugly irregular, or even is also possible to lead to burn failure.
Invention content
For the deficiency in the presence of the prior art, the present invention provides one kind realizing big chamfering knot by two-part chamfering
Structure can remove turning process from, bolt shank length is avoided to be abnormal variation, avoid burn failure, save the time and be produced into
This big chamfering cold upsetting die of car of bolt and technique.
The big chamfering cold upsetting die of car of bolt, including main mould A and main mould B, the process of the main mould A is before main mould B, the master
Through-hole is respectively equipped in the middle part of mould A and main mould B, the through-hole includes that the forming cavity positioned at front side and the mandril positioned at rear side are accommodating
Chamber；The first chamfered section is equipped between the forming cavity and mandril accommodating cavity of the main mould A, the forming cavity and mandril of the main mould B hold
It sets and is equipped with the second chamfered section between chamber；The mold internal diameter of second chamfered section end is not less than the 50% of bolt diameter,
The difference of the bolt diameter and the mold internal diameter of the first chamfered section end is the bolt diameter and the second chamfered section
The 50%-80% of the difference of the mold internal diameter of end.
Further, the difference of the bolt diameter and the mold internal diameter of the first chamfered section end is the bolt nominal
The 60%-70% of the difference of diameter and the mold internal diameter of the second chamfered section end.
Further, the chamfer angle of first chamfered section is 30 ° -60 °, and the chamfer angle of second chamfered section is
22.5 ° -45 °, the chamfer angle of first chamfered section is not less than the chamfer angle of the second chamfered section.
Further, the chamfer angle of first chamfered section is more than the chamfer angle of the second chamfered section.
The big chamfering cold heading technique of bolt, including the big chamfering cold upsetting die of car of aforementioned any bolt, when technological process proceeds to
When the process of main mould A, first is carried out while the forming cavity that bolt enters main mould A is molded under the action of the first chamfered section
Bolt ejection is entered next process after the process by secondary chamfering by the mandril in mandril accommodating cavity；When technique stream
When journey proceeds to the process of main mould B, while the forming cavity that bolt enters main mould B is molded under the action of the second chamfered section
Second of chamfering is carried out, is ejected bolt by the mandril in mandril accommodating cavity after the process.
Compared with the prior art, the present invention has the advantages that：
1, by using the operation of two-part chamfering is added in three sequences, four sequence, big chamfering is resolved into chamfering operation twice,
Turning process can not only be exempted, save time and production cost, moreover it is possible to bar portion length caused by the directly big chamfering of solution is possible
It shortens and problem that chamfer shape is irregular, can also further prevent burn failure.
2, it is not less than the angle of second of chamfering by using the angle of first time chamfering, when can further promote chamfering
Stability, significantly reduce bolt shank and be abnormal the probability of deformation, effectively extend the service life of mold.
Description of the drawings
Fig. 1 is the comparison diagram of existing process and process of the present invention；
Fig. 2 is main mould A structural schematic diagrams of the present invention；
Fig. 3 is the mold structure diagram of the prior art corresponding with the main mould A in Fig. 2；
Fig. 4 is main mould B structure schematic diagram of the present invention；
Fig. 5 is the mold structure diagram of the prior art corresponding with the main mould B in Fig. 4；
Wherein, 1 main mould A, 2 main mould B, 3 forming cavities, 4 mandril accommodating cavities, 5 first chamfered sections, 6 second chamfered sections.
Specific implementation mode
In order to which the technical means, creative features, achievable purpose and effectiveness for making invention realize are easy to understand, with reference to
It is specifically illustrating, the present invention is further explained.
The big chamfering cold upsetting die of car of bolt, including main mould A1 and main mould B2, the process of the main mould A1 is before main mould B2, institute
It states and is respectively equipped with through-hole in the middle part of main mould A1 and main mould B2, the through-hole includes positioned at the forming cavity 3 of front side and positioned at rear side
Mandril accommodating cavity 4；The first chamfered section 5 is equipped between the forming cavity 3 and mandril accommodating cavity 4 of the main mould A1, the main mould B2's
The second chamfered section is equipped between forming cavity 3 and mandril accommodating cavity 4.
It is summarized according to many experiments result, in order to reach preferable big chamfering molding effect, institute by chamfering twice
The 50% of bolt diameter should be not less than by stating the mold internal diameter of the second chamfered section end, and the bolt diameter falls with first
The difference of the mold internal diameter of 5 end of corner is the difference of the mold internal diameter of 6 end of the bolt diameter and the second chamfered section
50%-80%, within the scope of this, the two-part chamfering can effectively avoid bolt shank length be abnormal variation with
And prevent burn failure.The chamfered section end refers to the position that chamfered section is connected with mandril accommodating cavity.Preferably, the spiral shell
The difference of bolt nominal diameter and the mold internal diameter of the first chamfered section end is the bolt diameter and the second chamfered section end
The 60%-70% of the difference of mold internal diameter.It is the value range of the optimization of experimental summary within the scope of this.
The effect that the setting of the mold inner diameter size of first chamfered section end synthesizes chamfering twice big chamfering plays weight
It acts on, if the mold internal diameter of the first chamfered section end is too small, when first time chamfering easily goes wrong；If the first chamfering
The mold internal diameter of portion end is excessive, then easily goes wrong when second of chamfering, could be simultaneous only in suitable range above-mentioned
The molding effect of Gu Qianhou chamferings twice.
The big chamfering cold heading technique of bolt, including the big chamfering cold upsetting die of car of aforementioned bolt, when technological process proceeds to main mould A's
When process, first time chamfering is carried out while the forming cavity that bolt enters main mould A is molded under the action of the first chamfered section,
Bolt ejection is entered into next process by the mandril in mandril accommodating cavity after the process；When technological process proceeds to
When the process of main mould B, second is carried out while the forming cavity that bolt enters main mould B is molded under the action of the second chamfered section
Secondary chamfering is ejected bolt by the mandril in mandril accommodating cavity after the process.
The big chamfering cold heading technique of bolt, by taking hexagon flange bolt as an example, as shown in Figure 1, being passed through in traditional processing technology
Cross that blank, head be preforming, light rushes circumscribed circle molding, the processes such as turret head, upsetting squeeze turret head flange face are squeezed in bar portion undergauge, contracting,
Big chamfering is carried out by secondary turning processing again.And a kind of big chamfer angle technique of new bolt provided by the invention, it is rushed with three moulds four
For technique, it can be carried out at the same time first time chamfering during three sequences (i.e. bar portion undergauge and contracting in Fig. 1 squeeze turret head process),
And second of chamfering is carried out during four sequences (i.e. upsetting squeeze turret head flange face process in Fig. 1).
It so, can without secondary turning manufacturing procedure and direct cold-heading molding big chamfering.Due to pass through two
A main mould realizes two-part chamfering, therefore the big chamfer angle technique of the bolt needs in the technique including two or more main mould
It is improved.In the case of more than two main mould, the chamfered section for carrying out chamfering twice is not limited to be arranged in specific main mould
On, can flexibly be arranged as the case may be, as long as process where ensureing first time chamfering where second of chamfering process it
Before.It illustrates how to carry out chamfering twice by taking specific bolt as an example below.
Embodiment 1：
By taking M12 hexagon flange bolts as an example, when first time chamfering in three sequences, used main mould is (such as Fig. 2 institutes
Show) compared with the main mould (as shown in Figure 3) used in three sequences of traditional processing technology, first is increased after undergauge press section falls
The chamfer angle in corner, first chamfered section is 45 °, and the mold internal diameter of the first chamfered section end is 9mm.
When second of chamfering in four sequences, four sequence institutes of used main mould (as shown in Figure 4) and traditional processing technology
Main mould (as shown in Figure 5) is compared, and the second chamfered section, the chamfer angle of second chamfered section are increased after press section
It it is 45 °, the mold internal diameter of the second chamfered section end is 7mm.After the mold internal diameter of second chamfered section end is molded with bolt
End of thread end face diameter it is corresponding.The difference of the bolt diameter and the mold internal diameter of the first chamfered section end is the spiral shell
The difference of bolt nominal diameter and the mold internal diameter of the second chamfered section end is 60%.
Embodiment 2：
By taking M12 hexagon flange bolts as an example, when first time chamfering in three sequences, used main mould is (such as Fig. 2 institutes
Show) compared with the main mould (as shown in Figure 3) used in three sequences of traditional processing technology, first is increased after undergauge press section falls
The chamfer angle in corner, first chamfered section is 60 °, and the mold internal diameter of the first chamfered section end is 8.5mm.
When second of chamfering in four sequences, four sequence institutes of used main mould (as shown in Figure 4) and traditional processing technology
Main mould (as shown in Figure 5) is compared, and the second chamfered section, the chamfer angle of second chamfered section are increased after press section
It it is 45 °, the mold internal diameter of the second chamfered section end is 7mm.After the mold internal diameter of second chamfered section end is molded with bolt
End of thread end face diameter it is corresponding.The difference of the bolt diameter and the mold internal diameter of the first chamfered section end is the spiral shell
The difference of bolt nominal diameter and the mold internal diameter of the second chamfered section end is 70%.
Embodiment 3：
By taking M12 hexagon flange bolts as an example, when first time chamfering in three sequences, used main mould is (such as Fig. 2 institutes
Show) compared with the main mould (as shown in Figure 3) used in three sequences of traditional processing technology, first is increased after undergauge press section falls
The chamfer angle in corner, first chamfered section is 45 °, and the mold internal diameter of the first chamfered section end is 9.5mm.
When second of chamfering in four sequences, four sequence institutes of used main mould (as shown in Figure 4) and traditional processing technology
Main mould (as shown in Figure 5) is compared, and the second chamfered section, the chamfer angle of second chamfered section are increased after press section
It it is 45 °, the mold internal diameter of the second chamfered section end is 7mm.After the mold internal diameter of second chamfered section end is molded with bolt
End of thread end face diameter it is corresponding.The difference of the bolt diameter and the mold internal diameter of the first chamfered section end is the spiral shell
The difference of bolt nominal diameter and the mold internal diameter of the second chamfered section end is 50%.
The big chamfering cold heading technique of screw thread, by taking hex bolts as an example, in traditional processing technology by blank, head it is preforming,
Light rushes circumscribed circle molding, cuts the processes such as turret head, then carries out big chamfering by secondary turning processing.And one kind provided by the invention
The big chamfer angle technique of new bolt, by taking three moulds three rush technique as an example, can during the sequence (i.e. head preforming operation) simultaneously into
Row first time chamfering, and second of chamfering is carried out during two sequences (i.e. light rushes circumscribed circle molding procedure).
In the case of more than two main mould, the chamfered section for carrying out chamfering twice is not limited to be arranged in specific main mould
On, can flexibly be arranged as the case may be, as long as process where ensureing first time chamfering where second of chamfering process it
Before.It illustrates how to carry out chamfering twice by taking specific bolt as an example below.
Embodiment 4：
By taking M10 hex bolts as an example, in a sequence when first time chamfering, the one of used main mould and traditional processing technology
Main mould used in sequence is compared, and the first chamfered section is increased after press section, and the chamfer angle of first chamfered section is 30 °,
The mold internal diameter of first chamfered section end is 7mm.
When second of chamfering in four sequences, the main mould phase used in two sequences of the used main mould with traditional processing technology
Than increasing the second chamfered section after press section, the chamfer angle of second chamfered section is 22.5 °, the second chamfered section end
The mold internal diameter at end is 5mm.The mold internal diameter of second chamfered section end and bolt end of thread end face diameter phase after molding
It is corresponding.The difference of the bolt diameter and the mold internal diameter of the first chamfered section end is that the bolt diameter and second falls
The difference of the mold internal diameter of corner end is 60%.
Embodiment 5：
By taking M10 hex bolts as an example, in a sequence when first time chamfering, the one of used main mould and traditional processing technology
Main mould used in sequence is compared, and the first chamfered section is increased after press section, and the chamfer angle of first chamfered section is 45 °,
The mold internal diameter of first chamfered section end is 6mm.
When second of chamfering in four sequences, the main mould phase used in four sequences of the used main mould with traditional processing technology
Than increasing the second chamfered section after press section, the chamfer angle of second chamfered section is 30 °, the first chamfered section end
Mold internal diameter be 5mm.The mold internal diameter of second chamfered section end is opposite with bolt end of thread end face diameter after molding
It answers.The difference of the bolt diameter and the mold internal diameter of the first chamfered section end is the bolt diameter and the second chamfering
The difference of the mold internal diameter of portion end is 80%.
Embodiment 6：
By taking M10 hex bolts as an example, in a sequence when first time chamfering, the one of used main mould and traditional processing technology
Main mould used in sequence is compared, and the first chamfered section is increased after press section, and the chamfer angle of first chamfered section is 30 °,
The mold internal diameter of first chamfered section end is 6.8mm.
When second of chamfering in four sequences, the main mould phase used in four sequences of the used main mould with traditional processing technology
Than increasing the second chamfered section after press section, the chamfer angle of second chamfered section is 30 °, the first chamfered section end
Mold internal diameter be 5mm.The mold internal diameter of second chamfered section end is opposite with bolt end of thread end face diameter after molding
It answers.The difference of the bolt diameter and the mold internal diameter of the first chamfered section end is the bolt diameter and the second chamfering
The difference of the mold internal diameter of portion end is 64%.
Although hexagon flange bolt and hex bolts that above-described embodiment uses, its conclusion can be generalized to other spiral shells
Bolt gets on.More specifically, big chamfering can also be decomposed into even more multiple chamfering operation three times, as long as ensureing to fall every time
All there are one independent main moulds to be responsible for (i.e. chamfering number is not more than main mould number) for angle operation.In the above-described embodiments first
Secondary chamfer angle is preferably between 30 ° -60 °, and for second of chamfer angle preferably between 22.5 ° -45 °, chamfer angle selects this
A range can improve the stability of chamfering.In addition, the angle of chamfering can be further not less than the angle of next chamfering every time
Stability when chamfering is promoted, the probability that bolt shank is abnormal deformation is significantly reduced, effectively extends the service life of mold.
The foregoing is merely the preferred embodiment of the present invention, protection scope of the present invention is not limited in above-mentioned embodiment party
Formula, every technical solution for belonging to the principle of the invention all belong to the scope of protection of the present invention.For those skilled in the art
Speech, several improvement carried out without departing from the principles of the present invention, these improvement also should be regarded as the protection model of the present invention
It encloses.
Claims (5)
1. the big chamfering cold upsetting die of car of bolt, including main mould A and main mould B, before main mould B, feature exists the process of the main mould A
In：Through-hole is respectively equipped in the middle part of the main mould A and main mould B, the through-hole includes positioned at the forming cavity of front side and positioned at rear side
Mandril accommodating cavity；The first chamfered section, the molding of the main mould B are equipped between the forming cavity and mandril accommodating cavity of the main mould A
The second chamfered section is equipped between chamber and mandril accommodating cavity；The mold internal diameter of second chamfered section end is straight not less than bolt nominal
The difference of the mold internal diameter of the 50% of diameter, the bolt diameter and the first chamfered section end is the bolt diameter and the
The 50%-80% of the difference of the mold internal diameter of two chamfered section ends.
2. the big chamfering cold upsetting die of car of bolt according to claim 1, it is characterised in that：The bolt diameter and first
The difference of the mold internal diameter of chamfered section end is the difference of the bolt diameter and the mold internal diameter of the second chamfered section end
60%-70%.
3. the big chamfering cold upsetting die of car of bolt according to claim 1, it is characterised in that：The chamfering angle of first chamfered section
Degree is 30 ° -60 °, and the chamfer angle of second chamfered section is 22.5 ° -45 °, and the chamfer angle of first chamfered section is not small
In the chamfer angle of the second chamfered section.
4. the big chamfering cold upsetting die of car of bolt according to claim 3, it is characterised in that：The chamfering angle of first chamfered section
Chamfer angle of the degree more than the second chamfered section.
5. the big chamfering cold heading technique of bolt, including such as big chamfering cold upsetting die of car of Claims 1 to 4 any one of them bolt,
It is characterized in that：When technological process proceeds to the process of main mould A, while the forming cavity that bolt enters main mould A is molded
First time chamfering is carried out under the action of first chamfered section, by the mandril in mandril accommodating cavity by bolt top after the process
Go out to enter next process；When technological process proceeds to the process of main mould B, the forming cavity that bolt enters main mould B is molded
While second of chamfering is carried out under the action of the second chamfered section, by the mandril in mandril accommodating cavity after the process
Bolt is ejected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810975452.XA CN108787979B (en) | 2018-08-24 | 2018-08-24 | Bolt large-chamfer cold heading die and process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810975452.XA CN108787979B (en) | 2018-08-24 | 2018-08-24 | Bolt large-chamfer cold heading die and process |
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| Publication Number | Publication Date |
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| CN108787979A true CN108787979A (en) | 2018-11-13 |
| CN108787979B CN108787979B (en) | 2020-09-25 |
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| CN201810975452.XA Active CN108787979B (en) | 2018-08-24 | 2018-08-24 | Bolt large-chamfer cold heading die and process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110102684A (en) * | 2019-04-30 | 2019-08-09 | 温州科腾紧固件有限公司 | Square head bolt is without cutting pin moulding process |
| CN112808926A (en) * | 2020-12-31 | 2021-05-18 | 邯郸市燕赵紧固件制造有限公司 | Cold heading machine for bolt machining |
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| CN110102684A (en) * | 2019-04-30 | 2019-08-09 | 温州科腾紧固件有限公司 | Square head bolt is without cutting pin moulding process |
| CN112808926A (en) * | 2020-12-31 | 2021-05-18 | 邯郸市燕赵紧固件制造有限公司 | Cold heading machine for bolt machining |
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| Publication number | Publication date |
|---|---|
| CN108787979B (en) | 2020-09-25 |
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