CN112496249A - Processing technology of high-temperature-resistant anti-loosening bolt - Google Patents
Processing technology of high-temperature-resistant anti-loosening bolt Download PDFInfo
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- CN112496249A CN112496249A CN202011254744.8A CN202011254744A CN112496249A CN 112496249 A CN112496249 A CN 112496249A CN 202011254744 A CN202011254744 A CN 202011254744A CN 112496249 A CN112496249 A CN 112496249A
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- 238000012545 processing Methods 0.000 title claims abstract description 29
- 238000005516 engineering process Methods 0.000 title claims abstract description 27
- 230000032683 aging Effects 0.000 claims abstract description 19
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 239000006104 solid solution Substances 0.000 claims abstract description 7
- 239000000243 solution Substances 0.000 claims description 22
- 238000005096 rolling process Methods 0.000 claims description 12
- 238000012360 testing method Methods 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 5
- 230000002238 attenuated effect Effects 0.000 abstract description 4
- 238000012797 qualification Methods 0.000 abstract description 3
- 239000011295 pitch Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/44—Making machine elements bolts, studs, or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
- B21H3/06—Making by means of profiled members other than rolls, e.g. reciprocating flat dies or jaws, moved longitudinally or curvilinearly with respect to each other
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0093—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for screws; for bolts
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a processing technology of a high-temperature-resistant anti-loosening bolt, which comprises the following steps: s1, selecting austenitic stainless steel as a raw material, and manufacturing a corresponding blank according to the product specification; s2, cold heading four sections of blanks with different sizes, namely a head, a first thread section, a connecting section and a second thread section; and S3, upsetting the head of the blank into a hexagonal shape. The invention has the advantages that the standard thread and the anti-loosening thread are twisted out at one time, the processing technology is simple, and the qualification rate of the finished product is high; austenitic stainless steel is adopted as a raw material, and the hardness and the mechanical property reach 10.9 grades through solid solution and aging treatment; meanwhile, the tooth shape of the anti-loosening thread is not easy to deform, the torque performance cannot be greatly attenuated, and the anti-loosening thread can be repeatedly used for many times; the self-locking oblique angle is increased, the locking of only one side surface of the traditional thread is changed, and the effect of locking both the bottom and the side surface of the external thread is achieved; the reliability of tightening torque and clamping force is increased, and loosening can be effectively prevented.
Description
Technical Field
The invention relates to the technical field of bolt processing, in particular to a processing technology of a high-temperature-resistant anti-loosening bolt.
Background
The bolt is used for fastening parts with through holes, is widely applied to various industries, and has different requirements on the bolt in different application scenes, such as extremely small bolts which need to be used for cameras, glasses, clocks, electronics and the like; large bolts are used for engineering, buildings and bridges; in addition, in transportation equipment, airplanes, electric trains, automobiles, and the like, bolts of large and small sizes are used in combination, and thus the bolts have an industrially important task.
In the existing fastener assembling structure, the most of the existing fastener assembling structures adopt a standard internal thread self-locking structure, however, in the process of processing and forming a bolt, the following problems still exist:
1. excessive gaps exist in the standard thread matching, and the fastener is easy to loosen when vibrated and thermally expanded;
2. after the nut is formed, the limited self-locking effect can be generated only by pressing and deforming the threads, and the vibration and high-temperature use occasions can not be satisfied reliably.
3. The bolt tightening torque is small and cannot be repeated for many times.
Based on the situation, the invention provides a processing technology of a high-temperature-resistant anti-loosening bolt, which can effectively solve the problems.
Disclosure of Invention
The invention aims to provide a processing technology of a high-temperature-resistant anti-loosening bolt. The invention has the advantages that the standard thread and the anti-loosening thread are twisted out at one time, the processing technology is simple, and the qualification rate of the finished product is high; austenitic stainless steel is adopted as a raw material, and the hardness and the mechanical property reach 10.9 grades through solid solution and aging treatment; meanwhile, the tooth shape of the anti-loosening thread is not easy to deform, the torque performance cannot be greatly attenuated, and the anti-loosening thread can be repeatedly used for many times; the self-locking oblique angle is increased, the locking of only one side surface of the traditional thread is changed, and the effect of locking both the bottom and the side surface of the external thread is achieved; the reliability of tightening torque and clamping force is increased, and loosening can be effectively prevented.
The invention is realized by the following technical scheme:
the processing technology of the high-temperature-resistant anti-loosening bolt is characterized by comprising the following steps of: the method comprises the following steps:
s1, selecting austenitic stainless steel as a raw material, and manufacturing a corresponding blank according to the product specification;
s2, cold heading four sections of blanks with different sizes, namely a head, a first thread section, a connecting section and a second thread section;
s3, upsetting the head of the blank into a hexagonal shape;
s4, cleaning and removing surface dirt generated by cold heading;
s5, carrying out solution treatment on the blank;
s6, aging the blank;
s7, adopting a thread rolling machine to roll standard threads and anti-loosening threads on the first thread section and the second thread section at one time;
s8, carrying out special effective torque numerical test on the bolt after thread rolling;
and S9, coating the surface according to the customer specification.
By adopting the technical scheme; austenitic stainless steel is adopted as a raw material, and the hardness and the mechanical property reach 10.9 grades through solid solution and aging treatment; meanwhile, the tooth shape of the anti-loosening thread is not easy to deform, the torque performance cannot be greatly attenuated, and the anti-loosening thread can be repeatedly used for many times;
according to the above technical solution, as a further preferable technical solution of the above technical solution, the anti-loosening thread is provided with a self-locking bevel.
By adopting the technical scheme, the self-locking oblique angle is increased, the locking of only one side surface of the traditional thread is changed, and the effect of locking both the bottom and the side surface of the external thread is achieved; the reliability of tightening torque and clamping force is increased, and loosening can be effectively prevented.
According to the technical scheme, as a further preferable technical scheme of the technical scheme, an included angle a between the self-locking oblique angle and the horizontal direction is 6-8 degrees.
Through adopting above-mentioned technical scheme, the contained angle of auto-lock oblique angle and horizontal direction is 6-8, has further increased the reliability of screwing up moment and clamp force, prevents more effectively not hard up.
According to the above technical means, as a further preferable technical means of the above technical means, the thread height of the standard thread is 0.864-0.870 mm; the thread height of the anti-loosening thread is 0.523-0.528 mm.
Through adopting above-mentioned technical scheme, the thread height of locking screw thread that takes off is less than the thread height of standard screw thread for the tooth form non-deformable of locking screw thread that takes off, the moment of torsion performance can not attenuate by a wide margin, can use repeatedly many times.
According to the above technical solution, as a further preferable technical solution of the above technical solution, the thread pitches of the standard thread and the anti-loosening thread are both the same.
According to the above technical solution, as a further preferable technical solution of the above technical solution, in step S5, the solid solution temperature is controlled to 890-.
By adopting the technical scheme, the stress of the blank is eliminated, and the proper grain size is obtained, so that the high-temperature creep resistance is ensured.
According to the technical scheme, as a further preferable technical scheme of the technical scheme, in the step S6, the aging temperature is controlled to be 700-770 ℃, and the heat preservation is carried out for 12 h.
By adopting the technical scheme, the internal stress of the blank is eliminated, the structure and the size are stabilized, and the hardness of the blank is improved.
Compared with the prior art, the invention has the following advantages and beneficial effects: the invention has the advantages that the standard thread and the anti-loosening thread are twisted out at one time, the processing technology is simple, and the qualification rate of the finished product is high; austenitic stainless steel is adopted as a raw material, and the hardness and the mechanical property reach 10.9 grades through solid solution and aging treatment; meanwhile, the tooth shape of the anti-loosening thread is not easy to deform, the torque performance cannot be greatly attenuated, and the anti-loosening thread can be repeatedly used for many times; the self-locking oblique angle is increased, the locking of only one side surface of the traditional thread is changed, and the effect of locking both the bottom and the side surface of the external thread is achieved; the reliability of tightening torque and clamping force is increased, and loosening can be effectively prevented.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the assembled structure of the present invention;
fig. 3 is a partially enlarged view of a portion a of fig. 2.
Reference numerals: 1. a head portion; 2. a first thread section; 3. a connecting section; 4. a second thread section; 5. standard threads; 6. anti-loosening threads; 7. self-locking the bevel angle.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in conjunction with specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The treatment processes of solution treatment and aging treatment, etc., are obtained from conventional commercial sources or prepared by conventional methods if no special description is given, and the specific structure, the working principle, the control mode and the spatial arrangement mode which can be involved adopt the conventional selection in the field, which should not be regarded as the innovation point of the invention, and the invention is not further detailed in detail.
Example 1:
a processing technology of a high-temperature-resistant anti-loosening bolt comprises the following steps:
s1, selecting austenitic stainless steel as a raw material, and manufacturing a corresponding blank according to the product specification;
s2, cold heading four sections of blanks with different sizes, namely a head 1, a first thread section 2, a connecting section 3 and a second thread section 4;
s3, upsetting the head 1 of the blank into a hexagonal shape;
s4, cleaning and removing surface dirt generated by cold heading;
s5, carrying out solution treatment on the blank;
s6, aging the blank;
s7, uniformly twisting standard threads 5 and anti-loosening threads 6 on the first thread section 2 and the second thread section 4 by using a thread rolling machine;
s8, carrying out special effective torque numerical test on the bolt after thread rolling;
and S9, coating the surface according to the customer specification.
Further, the anti-loosening thread 6 is provided with a self-locking bevel 7.
Furthermore, the included angle a between the self-locking bevel 7 and the horizontal direction is 6-8 degrees.
Further, the thread height of the standard thread 5 is 0.864-0.870 mm; the thread height of the anti-loosening thread 6 is 0.522-0.528 mm.
Further, the thread pitch of the standard thread 5 and the thread pitch of the anti-loosening thread 6 are both the same.
Further, in step S5, the solid solution temperature is controlled to 890-920 ℃, and the temperature is maintained for 1 h.
Further, in step S6, the aging temperature is controlled to 700-770 ℃, and the temperature is maintained for 12 h.
Example 2:
a processing technology of a high-temperature-resistant anti-loosening bolt comprises the following steps:
s1, selecting austenitic stainless steel as a raw material, and manufacturing a corresponding blank according to the product specification;
s2, cold heading four sections of blanks with different sizes, namely a head 1, a first thread section 2, a connecting section 3 and a second thread section 4;
s3, upsetting the head 1 of the blank into a hexagonal shape;
s4, cleaning and removing surface dirt generated by cold heading;
s5, carrying out solution treatment on the blank;
s6, aging the blank;
s7, uniformly twisting standard threads 5 and anti-loosening threads 6 on the first thread section 2 and the second thread section 4 by using a thread rolling machine;
s8, carrying out special effective torque numerical test on the bolt after thread rolling;
and S9, coating the surface according to the customer specification.
Further, the anti-loosening thread 6 is provided with a self-locking bevel 7.
Further, the included angle a between the self-locking bevel 7 and the horizontal direction is 7 degrees.
Further, the thread height of the standard thread 5 is 0.867 mm; the thread height of the anti-loosening thread 6 is 0.525 mm.
Further, the thread pitch of the standard thread 5 and the thread pitch of the anti-loosening thread 6 are both the same.
Further, in step S5, the solution temperature is controlled to 905 ℃ and maintained for 1 hour.
Further, in step S6, the aging temperature is controlled to 735 ℃ and the temperature is maintained for 12 hours.
Example 3:
a processing technology of a high-temperature-resistant anti-loosening bolt comprises the following steps:
s1, selecting austenitic stainless steel as a raw material, and manufacturing a corresponding blank according to the product specification;
s2, cold heading four sections of blanks with different sizes, namely a head 1, a first thread section 2, a connecting section 3 and a second thread section 4;
s3, upsetting the head 1 of the blank into a hexagonal shape;
s4, cleaning and removing surface dirt generated by cold heading;
s5, carrying out solution treatment on the blank;
s6, aging the blank;
s7, uniformly twisting standard threads 5 and anti-loosening threads 6 on the first thread section 2 and the second thread section 4 by using a thread rolling machine;
s8, carrying out special effective torque numerical test on the bolt after thread rolling;
and S9, coating the surface according to the customer specification.
Further, the anti-loosening thread 6 is provided with a self-locking bevel 7.
Further, the included angle a between the self-locking bevel 7 and the horizontal direction is 6 degrees.
Further, the thread height of the standard thread 5 is 0.864 mm; the thread height of the anti-loosening thread 6 is 0.522 mm.
Further, the thread pitch of the standard thread 5 and the thread pitch of the anti-loosening thread 6 are both the same.
Further, in step S5, the solution temperature is controlled to 890 ℃ and the temperature is maintained for 1 hour.
Further, in step S6, the aging temperature is controlled to 700 ℃ and the temperature is maintained for 12 h.
Example 4:
a processing technology of a high-temperature-resistant anti-loosening bolt comprises the following steps:
s1, selecting austenitic stainless steel as a raw material, and manufacturing a corresponding blank according to the product specification;
s2, cold heading four sections of blanks with different sizes, namely a head 1, a first thread section 2, a connecting section 3 and a second thread section 4;
s3, upsetting the head 1 of the blank into a hexagonal shape;
s4, cleaning and removing surface dirt generated by cold heading;
s5, carrying out solution treatment on the blank;
s6, aging the blank;
s7, uniformly twisting standard threads 5 and anti-loosening threads 6 on the first thread section 2 and the second thread section 4 by using a thread rolling machine;
s8, carrying out special effective torque numerical test on the bolt after thread rolling;
and S9, coating the surface according to the customer specification.
Further, the anti-loosening thread 6 is provided with a self-locking bevel 7.
Further, the included angle a between the self-locking bevel 7 and the horizontal direction is 8 degrees.
Further, the thread height of the standard thread 5 is 0.870 mm; the thread height of the anti-loosening thread 6 is 0.528 mm.
Further, the thread pitch of the standard thread 5 and the thread pitch of the anti-loosening thread 6 are both the same.
Further, in step S5, the solution temperature is controlled to 920 ℃ and the temperature is maintained for 1 hour.
Further, in step S6, the aging temperature is controlled to 770 ℃, and the temperature is maintained for 12 h.
Comparative example 1
The difference from example 2 is that the solution treatment and the aging treatment were not performed, and the other steps are the same as example 2.
Comparative example 2
The difference from embodiment 2 is that no self-locking bevel is provided, and the other is the same as embodiment 2.
The finished bolts obtained in examples 2 to 4 of the present invention, comparative examples 1 to 2 and ordinary bolts made of stainless steel were subjected to performance tests, and the test results are shown in table 1:
TABLE 1
As can be seen from the above table, the high temperature resistant anti-loose bolt of the present invention has the following advantages: high hardness, large tightening torque, good high-temperature resistance and good anti-seismic and anti-loosening performance.
By comparing the example 2 with the comparative example 1, it can be seen from the above table analysis that the hardness of the bolt after the solution treatment and the aging treatment is significantly increased, and the high temperature resistance is improved.
By comparing the embodiment 2, the comparative example 2 and the common bolt, the above analysis shows that the bolt with the anti-loosening thread has good anti-vibration anti-loosening performance and large tightening torque compared with the common bolt; compared with the bolt without the anti-loosening thread with the self-locking oblique angle, the bolt with the anti-loosening thread with the self-locking oblique angle has good anti-seismic anti-loosening performance and large tightening torque.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (7)
1. The processing technology of the high-temperature-resistant anti-loosening bolt is characterized by comprising the following steps of: the method comprises the following steps:
s1, selecting austenitic stainless steel as a raw material, and manufacturing a corresponding blank according to the product specification;
s2, cold heading four sections of blanks with different sizes, namely a head, a first thread section, a connecting section and a second thread section;
s3, upsetting the head of the blank into a hexagonal shape;
s4, cleaning and removing surface dirt generated by cold heading;
s5, carrying out solution treatment on the blank;
s6, aging the blank;
s7, adopting a thread rolling machine to roll standard threads and anti-loosening threads on the first thread section and the second thread section at one time;
s8, carrying out special effective torque numerical test on the bolt after thread rolling;
and S9, coating the surface according to the customer specification.
2. The processing technology of the high-temperature-resistant anti-loosening bolt as claimed in claim 1, wherein the processing technology comprises the following steps: the anti-loosening thread is provided with a self-locking oblique angle.
3. The processing technology of the high-temperature-resistant anti-loosening bolt as claimed in claim 2, wherein the processing technology comprises the following steps: the included angle a between the self-locking oblique angle and the horizontal direction is 6-8 degrees.
4. The processing technology of the high-temperature-resistant anti-loosening bolt as claimed in claim 1, wherein the processing technology comprises the following steps: the thread height of the standard thread is 0.864-0.870 mm; the thread height of the anti-loosening thread is 0.523-0.528 mm.
5. The processing technology of the high-temperature-resistant anti-loosening bolt as claimed in claim 1, wherein the processing technology comprises the following steps: the thread pitch of the standard thread and the thread pitch of the anti-loosening thread are consistent.
6. The processing technology of the high-temperature-resistant anti-loosening bolt as claimed in claim 1, wherein the processing technology comprises the following steps: in step S5, the solid solution temperature is controlled to 890-920 ℃, and the temperature is maintained for 1 h.
7. The processing technology of the high-temperature-resistant anti-loosening bolt as claimed in claim 1, wherein the processing technology comprises the following steps: in step S6, the aging temperature is controlled to 700-770 ℃, and the temperature is kept for 12 h.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011254744.8A CN112496249A (en) | 2020-11-11 | 2020-11-11 | Processing technology of high-temperature-resistant anti-loosening bolt |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011254744.8A CN112496249A (en) | 2020-11-11 | 2020-11-11 | Processing technology of high-temperature-resistant anti-loosening bolt |
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| CN112496249A true CN112496249A (en) | 2021-03-16 |
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| CN202011254744.8A Pending CN112496249A (en) | 2020-11-11 | 2020-11-11 | Processing technology of high-temperature-resistant anti-loosening bolt |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116904724A (en) * | 2023-07-12 | 2023-10-20 | 舟山市7412工厂 | Bolt and heat treatment process thereof |
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Application publication date: 20210316 |