CN112247049A - Anti-rotation seat and machining method thereof - Google Patents
Anti-rotation seat and machining method thereof Download PDFInfo
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- CN112247049A CN112247049A CN202011069081.2A CN202011069081A CN112247049A CN 112247049 A CN112247049 A CN 112247049A CN 202011069081 A CN202011069081 A CN 202011069081A CN 112247049 A CN112247049 A CN 112247049A
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- rotation
- metal material
- screw
- seat
- heating
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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
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
-
- 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
- B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
Abstract
The invention relates to an anti-rotation seat and a processing method thereof, wherein the processing method comprises the following steps: s1, shaping, namely cutting the columnar metal material to a fixed length to form a blank a; s2, heating, namely placing the blank a into a heating furnace to heat the workpiece to be above the recrystallization temperature of the metal material, wherein the metal material is original steel; heating at 500-700 ℃, S3, hot extrusion, and placing the heated workpiece into a hot extrusion die for extrusion forming; s4, cooling, namely cooling the extrusion-molded workpiece b; adopt hot extrusion moulding for the metal material plasticity after the heating is good, can realize one shot forming, will prevent one shot forming such as cassette, spacing groove, the hole of stepping down in the swivel mount, improve machining efficiency, practice thrift manufacturing procedure, improve machining efficiency, simultaneously, because metal material is in the change of its crystalline phase tissue of heating in-process, make the hardness of work piece also obtain promoting, further improve the torsional strength of product.
Description
Technical Field
The invention belongs to the technical field of standard parts, and relates to an anti-rotation seat and a processing method thereof.
Background
The anti-rotation seat is a common standard component, the anti-rotation seat is arranged at one end of the actuating piston rod, which is exposed out of the actuating cylinder barrel, the middle part of the anti-rotation seat is provided with a hole, one side of the anti-rotation seat is provided with a limit groove, and the head of the anti-rotation screw penetrates through the jack and is limited by the limit groove.
The existing anti-rotation seat is produced by adopting a cutting and die casting mode, the energy consumption is high in the processing and casting processes, the pollution is high, some cold extrusion processes are adopted, but the cold extrusion processes are high in metal hardness, so that products are easily scrapped, and the scrappage rate of the processes is high.
Disclosure of Invention
The invention aims to provide an anti-rotation seat and a processing method thereof aiming at the problems in the prior art.
The purpose of the invention can be realized by the following technical scheme: a processing method of an anti-rotation seat comprises the following steps:
s1, shaping, namely cutting the columnar metal material to a fixed length to form a blank;
s2, heating, namely placing the blank into a heating furnace to heat the workpiece to be above the recrystallization temperature of the metal material;
s3, hot extrusion, namely placing the heated workpiece into a hot extrusion die for extrusion forming;
and S4, cooling the extruded workpiece.
The processing method heats the blank to a temperature above the recrystallization temperature of the metal for extrusion before extrusion by virtue of the characteristic of good plasticity of the material at the hot forging temperature, so that the strength and the precision of the metal are improved, and the rejection rate of the product during processing is reduced.
In the above method for processing the anti-rotation seat, in step S4, after the normalizing cooling, i.e. the hot extrusion forming, the workpiece is taken out and cooled at room temperature. Adopt hot extrusion moulding for the metal material plasticity after the heating is good, can realize one shot forming, will prevent one shot forming such as cassette, spacing groove, the hole of stepping down in the swivel mount, improve machining efficiency, practice thrift manufacturing procedure, improve machining efficiency, simultaneously, because metal material is in the change of its crystalline phase tissue of heating in-process, make the hardness of work piece also obtain promoting, further improve the torsional strength of product.
In the machining method of the anti-rotation seat, the metal material is raw steel.
In the above processing method of the anti-rotation seat, the heating temperature is 500-700 ℃.
The utility model provides an prevent changeing seat, includes the shell, the both ends of shell be equipped with import and export respectively, the shell in be provided with and be used for preventing to prevent changeing screw pivoted cassette, cassette middle part open and to have the hole of stepping down that enables to prevent changeing screw head and pass through, the cassette be close to the distance between import one side and the import and be less than the cassette and be close to the distance between export one side and the export.
In the anti-rotation seat, the clamping seat comprises a clamping portion for clamping the screw head of the screw and a guide portion for guiding the screw head, and the guide portion is located on one side close to the inlet. When the anti-rotation screw enters the yielding hole, the anti-rotation screw can be guided.
In foretell prevent changeing the seat, joint portion be two and central symmetry set up in the shell, it has spacing draw-in groove to open in the joint portion, spacing draw-in groove symmetry each other just the both sides of the separated hole of stepping down. The head of the anti-rotation screw penetrates through the clamping portion through the abdicating hole, and the screw heads of the head are clamped in the limiting clamping groove after the head is rotated.
In foretell prevent changeing the seat, joint portion include first spacing portion and the spacing portion of second, first spacing portion height be higher than the spacing portion of second, spacing draw-in groove be located between first spacing portion and the spacing portion of second, the first spacing portion of two joint portions sets up along the axle center central symmetry of shell. The second limiting part is lower than the first limiting part in height, so that the anti-rotation screw can be detached only by reaching the height of the second limiting part when the anti-rotation screw is detached; the first limiting parts of the two clamping parts are symmetrically arranged along the center of the axis of the shell, so that two ends of the screw head of the anti-rotation screw are respectively close to the first limiting parts when the anti-rotation screw rotates, and the anti-rotation screw is convenient to detach.
In the anti-rotation seat, the end of the second limiting part is arc-shaped. When the anti-rotation screw is required to be separated from the limiting clamping groove, the anti-rotation screw rotates towards one side of the second limiting portion, the arc-shaped surface of the second limiting portion can play a role in guiding, and the anti-rotation screw can be taken down by workers easily.
In the anti-rotation seat, the depth of the limiting clamping groove is larger than the thickness of the head of the anti-rotation screw, and the thickness between the second limiting part and the outlet is larger than the thickness of the head of the anti-rotation screw. Due to the arrangement, the anti-rotation screw is effectively prevented from falling off; when the anti-rotation seat is matched with other components, an outlet of the anti-rotation seat is required to be welded on other components, the thickness between the second limiting part and the outlet is larger than the thickness of the head of the anti-rotation bolt, so that the anti-rotation bolt can be conveniently installed and disassembled, after the anti-rotation seat is welded with other components, the anti-rotation bolt cannot be installed or the anti-rotation bolt is installed in advance and then welded, and the anti-rotation bolt cannot be disassembled.
Compared with the prior art, the hot extrusion processing method has the advantages that the blank is heated to a temperature above the recrystallization temperature of the metal for extrusion before extrusion by virtue of the characteristic of good plasticity of the material at the hot forging temperature, so that the strength and the precision of the metal are improved, and the rejection rate of the product during processing is reduced; adopt hot extrusion moulding for the metal material plasticity after the heating is good, can realize one shot forming, will prevent one shot forming such as cassette, spacing groove, the hole of stepping down in the swivel mount, improve machining efficiency, practice thrift manufacturing procedure, improve machining efficiency, simultaneously, because metal material is in the change of its crystalline phase tissue of heating in-process, make the hardness of work piece also obtain promoting, further improve the torsional strength of product.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a side view of the present invention;
fig. 3 is a top view of the present invention.
FIG. 4 is a schematic view of the structure of a workpiece after steps in the manufacturing process of the present invention.
In the figure, 1, a housing; 2. an inlet; 3. an outlet; 4. a card holder; 41. a clamping part; 411. a first limiting part; 412. a second limiting part; 42. a guide portion; 5. a hole of abdication; 6. a limiting clamping groove; a. a blank; b. and (3) extruding and forming the workpiece.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1 to 3, an anti-rotation seat comprises a shell 1, an inlet 2 and an outlet 3 are respectively arranged at two ends of the shell 1, a seat 4 for preventing rotation of an anti-rotation screw is arranged in the shell 1, a yielding hole 5 enabling the head of the anti-rotation screw to pass through is formed in the middle of the seat 4, the distance between one side of the seat 4 close to the inlet 2 and the inlet 2 is smaller than the distance between one side of the seat 4 close to the outlet 3 and the outlet 3, and the anti-rotation screw can accurately enter the yielding hole 5.
The clamping seat 4 comprises a clamping part 41 for clamping the screw head of the screw and a guide part 42 for guiding the screw head, and the guide part 42 is positioned on one side close to the inlet 2. When the anti-rotation screw enters the abdicating hole 5, the anti-rotation screw can be guided.
The depth of the limiting clamping groove 6 is larger than the thickness of the head of the anti-rotation screw. So set up, effectively prevent deviating from of commentaries on classics screw.
The clamping portion 41 comprises a first limiting portion 411 and a second limiting portion 412, the height of the first limiting portion 411 is higher than that of the second limiting portion 412, the limiting clamping groove 6 is located between the first limiting portion 411 and the second limiting portion 412, and the first limiting portions 411 of the two clamping portions 41 are symmetrically arranged along the center of the axis of the shell 1. The second limiting portion 412 is lower than the first limiting portion 411, so that the anti-rotation screw can be detached only by reaching the height of the second limiting portion 412 when the anti-rotation screw is detached; the first spacing portions 411 of the two clamping portions 41 are symmetrically arranged along the center of the axis of the shell 1, so that two ends of the screw head of the anti-rotation screw are respectively close to the first spacing portions 411 when the anti-rotation screw rotates, and the anti-rotation screw is convenient to detach.
The end of the second position-limiting portion 412 is arc-shaped. When the anti-rotation screw needs to be separated from the limiting clamping groove 6, the anti-rotation screw rotates towards one side of the second limiting portion 412, and the arc-shaped surface of the second limiting portion 412 can play a role in guiding, so that workers can take the anti-rotation screw down easily.
The thickness between the second limiting part 412 and the outlet 3 is larger than the thickness of the head of the anti-rotation bolt. Because should prevent changeing the seat and need will prevent the export 3 welding of transposition on other subassemblies when other subassemblies cooperate, with the thickness that is greater than the anti-rotation bolt head between spacing portion 412 of second and the export 3, be convenient for prevent changeing the installation and the dismantlement of screw, avoid changeing seat and other subassemblies and weld the back earlier, prevent changeing the unable installation of bolt or install in advance and prevent changeing the screw and weld the back again, prevent changeing the unable dismantlement of screw.
As shown in fig. 4, a method for processing an anti-rotation seat includes the following steps:
s1, shaping, namely cutting the columnar metal material to a fixed length to form a blank a;
s2, heating, namely placing the blank a into a heating furnace to heat the workpiece to be above the recrystallization temperature of the metal material, wherein the metal material is original steel; the heating temperature is 500-700 ℃.
S3, hot extrusion, namely placing the heated workpiece into a hot extrusion die for extrusion forming;
and S4, cooling the extrusion-molded workpiece b.
In step S4, the workpiece is taken out after being cooled by normalizing, i.e., hot extrusion molding, and cooled at room temperature. Adopt hot extrusion moulding for the metal material plasticity after the heating is good, can realize one shot forming, will prevent cassette 4 in the swivel mount, spacing draw-in groove 6, let one shot forming such as hole 5, improve machining efficiency, practice thrift manufacturing procedure, improve machining efficiency, simultaneously, because metal material is in the change of its crystalline phase tissue of heating in-process, make the hardness of work piece also obtain promoting, further improve the torsional strength of product.
Compared with the prior art, the processing method has the advantages that the blank is heated to a temperature higher than the recrystallization temperature of metal for extrusion before extrusion by virtue of the characteristic of good plasticity of the material at the hot forging temperature, so that the strength and the precision of the metal are improved, and the rejection rate of the product during processing is reduced; adopt hot extrusion moulding for the metal material plasticity after the heating is good, can realize one shot forming, will prevent one shot forming such as cassette, spacing groove, the hole of stepping down in the swivel mount, improve machining efficiency, practice thrift manufacturing procedure, improve machining efficiency, simultaneously, because metal material is in the change of its crystalline phase tissue of heating in-process, make the hardness of work piece also obtain promoting, further improve the torsional strength of product.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. The machining method of the anti-rotation seat is characterized by comprising the following steps of:
s1, shaping, namely cutting the columnar metal material to a fixed length to form a blank (a);
s2, heating, namely placing the blank (a) into a heating furnace to heat the workpiece to be higher than the recrystallization temperature of the metal material;
s3, hot extrusion, namely placing the heated workpiece into a hot extrusion die for extrusion forming;
and S4, cooling the extrusion-molded workpiece (b).
2. The machining method of the anti-rotation seat according to claim 1, characterized in that: in step S4, after the normalizing cooling, i.e., the hot extrusion molding, is performed, the workpiece is taken out and cooled at room temperature.
3. The machining method of the anti-rotation seat according to claim 1, characterized in that: the metal material is raw steel.
4. The machining method of the anti-rotation seat according to claim 1, characterized in that: the heating temperature is 500-700 ℃.
5. The anti-rotation seat according to any one of the application claims 1 to 3, comprising a housing (1), wherein an inlet (2) and an outlet (3) are respectively arranged at two ends of the housing (1), a seat (4) for preventing the anti-rotation screw from rotating is arranged in the housing (1), an abdicating hole (5) for allowing the head of the anti-rotation screw to pass is formed in the middle of the seat (4), and the distance between one side of the seat (4) close to the inlet (2) and the inlet (2) is smaller than the distance between one side of the seat (4) close to the outlet (3) and the outlet (3).
6. An anti-rotation seat according to claim 4, characterized in that: the clamping seat (4) comprises a clamping portion (41) used for clamping a screw head of a screw and a guide portion (42) used for guiding the screw head, and the guide portion (42) is located on one side close to the inlet (2).
7. An anti-rotation mount according to claim 5, characterized in that: joint portion (41) be two and central symmetry set up in shell (1), it has spacing draw-in groove (6) to open on joint portion (41), spacing draw-in groove (6) symmetry each other and the both sides of separated position hole (5).
8. An anti-rotation mount according to claim 5, characterized in that: joint portion (41) include first spacing portion (411) and second spacing portion (412), first spacing portion (411) highly be higher than second spacing portion (412), spacing draw-in groove (6) be located between first spacing portion (411) and second spacing portion (412), the first spacing portion (411) of two joint portions (41) set up along the axle center central symmetry of shell (1).
9. An anti-rotation mount according to claim 8, characterized in that: the end part of the second limiting part (412) is arc-shaped.
10. An anti-rotation mount according to claim 8, characterized in that: the depth of the limiting clamping groove (6) is larger than the thickness of the head of the anti-rotating screw, and the thickness between the second limiting part (412) and the outlet (3) is larger than the thickness of the head of the anti-rotating screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011069081.2A CN112247049B (en) | 2020-09-30 | 2020-09-30 | Anti-rotation seat and machining method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011069081.2A CN112247049B (en) | 2020-09-30 | 2020-09-30 | Anti-rotation seat and machining method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112247049A true CN112247049A (en) | 2021-01-22 |
| CN112247049B CN112247049B (en) | 2023-03-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011069081.2A Active CN112247049B (en) | 2020-09-30 | 2020-09-30 | Anti-rotation seat and machining method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114559210A (en) * | 2021-11-08 | 2022-05-31 | 南阳红阳远大重工有限公司 | Manufacturing process of upper bushing of drill rod guide piece for hydraulic breaker |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104889184A (en) * | 2015-05-26 | 2015-09-09 | 山东招金金银精炼有限公司 | Machining technology of high-relief gold and silver ingots |
| CN207417165U (en) * | 2017-10-18 | 2018-05-29 | 河北天启通宇航空器材科技发展有限公司 | The ventilation and heat window of gyroplane rear shell |
| CN108838622A (en) * | 2018-06-25 | 2018-11-20 | 常州市胜彪标准件模具有限公司 | A kind of cold extruding processing method of anti-rotary seat |
| CN208619507U (en) * | 2018-06-25 | 2019-03-19 | 常州市胜彪标准件模具有限公司 | A kind of anti-rotation seat mechanism |
| CN210769782U (en) * | 2019-07-15 | 2020-06-16 | 中航光电科技股份有限公司 | Novel bolt anti-loosening sealing assembly |
-
2020
- 2020-09-30 CN CN202011069081.2A patent/CN112247049B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104889184A (en) * | 2015-05-26 | 2015-09-09 | 山东招金金银精炼有限公司 | Machining technology of high-relief gold and silver ingots |
| CN207417165U (en) * | 2017-10-18 | 2018-05-29 | 河北天启通宇航空器材科技发展有限公司 | The ventilation and heat window of gyroplane rear shell |
| CN108838622A (en) * | 2018-06-25 | 2018-11-20 | 常州市胜彪标准件模具有限公司 | A kind of cold extruding processing method of anti-rotary seat |
| CN208619507U (en) * | 2018-06-25 | 2019-03-19 | 常州市胜彪标准件模具有限公司 | A kind of anti-rotation seat mechanism |
| CN210769782U (en) * | 2019-07-15 | 2020-06-16 | 中航光电科技股份有限公司 | Novel bolt anti-loosening sealing assembly |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114559210A (en) * | 2021-11-08 | 2022-05-31 | 南阳红阳远大重工有限公司 | Manufacturing process of upper bushing of drill rod guide piece for hydraulic breaker |
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| Publication number | Publication date |
|---|---|
| CN112247049B (en) | 2023-03-21 |
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Denomination of invention: An anti rotation seat and its processing method Effective date of registration: 20230504 Granted publication date: 20230321 Pledgee: Zhejiang Zhuji Rural Commercial Bank Co.,Ltd. Fengqiao sub branch Pledgor: Zhejiang shuangxiang Auto Parts Manufacturing Co.,Ltd. Registration number: Y2023980039566 |
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