CN112548022A - Method and device for machining oil groove bolt with large pan head - Google Patents
Method and device for machining oil groove bolt with large pan head Download PDFInfo
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- CN112548022A CN112548022A CN202011401159.6A CN202011401159A CN112548022A CN 112548022 A CN112548022 A CN 112548022A CN 202011401159 A CN202011401159 A CN 202011401159A CN 112548022 A CN112548022 A CN 112548022A
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- die
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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
- B21K1/46—Making machine elements bolts, studs, or the like with heads
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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
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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
- B21J9/00—Forging presses
- B21J9/02—Special design or construction
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Abstract
The invention discloses a method for processing a bolt with a large pan head oil groove, which comprises the following steps: selecting raw materials for processing bolts; putting the raw material into a cold header, and using the cold header to header a rod part of the raw material; upsetting the head of the raw material by using a cold header, and upsetting a chamfer at the bottom of the rod part; upsetting a head flange of a raw material by using a cold header, and upsetting a polish rod between the head flange and a rod part; and upsetting an oil groove at the lower part of the head flange by using a cold header. This application is through using the cold heading machine, utilizing the cold heading technology to come out with the oil groove cold heading of the pole portion of bolt, head flange, the chamfer of pole portion bottom, polished rod between head flange and the pole portion and head flange lower part, improves the mould life-span by a wide margin, and oil groove size uniformity is good, has improved production efficiency, has shortened manufacturing cycle, practices thrift the cost, improves the profit to guarantee the stable production of large batch bolt.
Description
Technical Field
The invention relates to the technical field of fastener production, in particular to a method and a device for machining a bolt with a large pan head oil groove.
Background
The oil groove bolt with the large pan head is widely applied to the field of automobile fasteners, is a fastener with wide application, and mainly considers the fact that the R angle under the bolt head interferes with the aperture of the opponent part to cause the interference of a bolt supporting surface and the plane of the opponent part, so that the possibility of loosening and separation of the bolt is caused subsequently, and the R angle under the bolt head is adopted to effectively solve the problem of non-fitting of the opponent part in an oil groove mode.
The difficulty of the products is that the oil grooves are very fine, and the bosses of the forming die are also very fine due to the fine oil grooves, so that the die is easy to collapse, the polished rod of the die is easy to crack, the service life of the die is short, the cost is high, the production efficiency is low, the product quality is poor, and the consistency is poor.
In summary, how to improve the service life of the mold, improve the production efficiency, and improve the product quality is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for processing a large pan head oil groove bolt, wherein a mold in the method and the apparatus for processing a large pan head oil groove bolt has a long service life, a high efficiency of producing the large pan head oil groove bolt, a strong product consistency, and an improved product quality.
In order to achieve the above purpose, the invention provides the following technical scheme:
a machining method for a large pan head oil groove bolt comprises the following steps:
selecting raw materials for processing bolts;
placing the raw material into a cold header, and using the cold header to roughly header a rod part of the raw material;
roughly upsetting the head of the raw material by using the cold header, finely upsetting the rod and upsetting a chamfer at the bottom of the rod;
using the cold header to finish upsetting the head into a head flange, finish upsetting the rod and upsetting a polish rod between the head flange and the rod;
and using the cold header to upset an oil groove at the lower part of the head flange.
Preferably, the step of placing the raw material into a cold header and using the cold header to rough-upset the rod portion of the raw material comprises:
and putting the raw material into a first female die of the cold header, and roughly upsetting the raw material into a first rod part by using a first extruding part.
Preferably, the first extrusion part comprises a first die and a first die ejector pin protruding out of the first die, a first groove is formed in the first die, a first through hole is formed at the bottom of the first groove, and a first die ejector pin is movably arranged in the first through hole; utilizing first extrusion portion to upset out the pole portion includes:
and utilizing the first die, the first die ejector pin, the first die and the first die ejector pin to roughly upset the raw material in the first groove to form the first rod part.
Preferably, said using said cold header to rough-upset the head of said stock material and to fine-upset said stem, upsetting the chamfer of said stem bottom, comprises:
and (3) roughly upsetting out the raw material behind the rod part, putting the raw material into a second female die of the cold header, upsetting out the head of the raw material by utilizing a second extrusion part and the second female die, and finely upsetting the first rod part into the second rod part and upsetting the bottom of the rod part into a first chamfer.
Preferably, a second groove is formed in the second female die, a first round table surface used for upsetting the first chamfer is arranged on the inner wall of the bottom of the second groove, a second through hole is formed in the bottom of the second groove, a second female die ejector pin is movably arranged in the second through hole, and the front end of the second female die ejector pin and the front end of the second through hole are located on the same vertical plane; the front end of the second punch die is provided with a first gradually-expanding opening, the front end of the second groove is provided with a second gradually-expanding opening, and the first gradually-expanding opening is opposite to the large-diameter end of the second gradually-expanding opening; utilize the second extrusion portion with the second die will the head of raw and other materials is upset out, and will first pole portion fine upsetting be the second pole portion, will the pole portion bottom is upset out first chamfer, include:
the head of the raw material is upset by the second punch die, the first gradually-expanding opening, the second gradually-expanding opening and the second die, and the first rod part is precisely upset into the second rod part and the bottom of the second rod part is upset into a first chamfer by the second punch die, the second groove, the first circular table surface and the second die thimble.
Preferably, said using said cold header to finish-upset said head into a head flange, finish-upset said stem, and upset out said head flange and polish rod between said stems, includes:
will the smart upset go out the second pole portion, upset head and upset are in the head behind the first chamfer raw and other materials are put into in the third die of cold heading machine, utilize the third extrusion portion with the third die will the head smart of raw and other materials is the head flange, and will the smart upset of second pole portion is the third pole portion, will first chamfer smart upset is the second chamfer, is upset out the head flange with polished rod between the pole portion.
Preferably, a third groove is formed in the third female die, a second round table surface for fine upsetting the first chamfer into the second chamfer is arranged on the inner wall of the bottom of the third groove, a third through hole is formed in the bottom of the third groove, a third female die ejector pin is movably arranged in the third through hole, the front end of the third female die ejector pin and the front end of the third through hole are located on the same vertical surface, a first annular groove with the inner diameter larger than that of the third groove is formed in the front end of the third groove, the third extrusion part comprises a third stamping die and a first arc-shaped groove arranged at the end part of the third stamping die, and a protruding part is arranged in the middle of the first arc-shaped groove; utilize the third extrusion portion with the third die will raw and other materials head fine upsetting is the head flange, and will second pole portion fine upsetting is third pole portion, will first chamfer fine upsetting is the second chamfer, includes:
utilize the third die the first arc recess the bellying the third die will the head of raw and other materials is the head flange, utilizes the third die reaches the ring channel is upset out the polished rod, utilizes the third die with the third recess will the second pole portion is the third pole portion, and the benefit will first chamfer is the second chamfer to the precision-upsetting.
Preferably, the upsetting out the oil groove of the lower portion of the head flange using the cold header includes:
and putting the raw material upsetting out of the head flange, the third rod part, the second chamfer and the polished rod into a fourth female die of the cold header, and upsetting out the oil groove by utilizing a fourth extrusion part and the fourth female die.
Preferably, the fourth pressing portion includes a fourth die, a second arc-shaped groove for accommodating the head flange is arranged at the front end of the fourth die, a fourth groove is arranged in the fourth die, a fourth through hole is arranged at the bottom of the fourth groove, a fourth die ejector pin is movably arranged in the fourth through hole, a second annular groove for accommodating the polish rod is arranged at the front end of the fourth groove, an annular protrusion is arranged on the outer end surface of the second annular groove, and the inner diameter of the annular protrusion is consistent with the inner diameter of the front end of the fourth groove; utilize the fourth extrusion portion with the fourth die is upset out the oil groove includes:
and upsetting the oil groove by utilizing the fourth stamping die, the second arc-shaped groove, the fourth concave die and the annular bulge.
A machining device for a large pan head oil groove bolt comprises: fuselage, control system, be used for the first cold heading portion of thick heading raw and other materials pole portion, be used for thick heading out the head of raw and other materials to the fine heading the pole portion, upset out the second cold heading portion of the chamfer of pole portion bottom, be used for with the head fine heading is head flange, fine heading the pole portion, and upset out the head flange with the third cold heading portion of polished rod between the pole portion, be used for upsetting out the fourth cold heading portion of the oil groove of head flange lower part and be used for taking out and putting into the raw and other materials in the first cold heading portion the access mechanism of second cold heading portion, access mechanism still is used for taking out and putting into the raw and other materials in the second cold heading portion the third cold heading portion, will raw and other materials in the third cold heading portion take out and put into in the fourth cold heading portion, first cold heading portion, second cold heading portion the third cold heading portion and fourth cold heading portion all set up in the fuselage, access mechanism is mobilizable set up in the fuselage, first cold heading portion second cold heading portion third cold heading portion fourth cold heading portion reaches access mechanism all with control system signal connection.
This application is through using the cold heading machine, utilizing the cold heading technology to come out with the oil groove cold heading of the pole portion of bolt, head flange, the chamfer of pole portion bottom, polished rod between head flange and the pole portion and head flange lower part, improves the mould life-span by a wide margin, and oil groove size uniformity is good, has improved production efficiency, has shortened manufacturing cycle, practices thrift the cost, improves the profit to guarantee the stable production of large batch bolt.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a method for machining a large pan head oil groove bolt provided by the invention;
FIG. 2 is a schematic view of a first pressing part and a first female die provided in the present invention;
FIG. 3 is a schematic view of a second extrusion and a second die provided in the present invention;
FIG. 4 is a schematic view of a third extrusion and a third cavity die provided in the present invention;
FIG. 5 is a schematic view of a fourth extrusion and a fourth die provided in the present invention;
FIG. 6 is an enlarged view at X in FIG. 5;
FIG. 7 is a bolt after a station process;
FIG. 8 is a bolt after two-station machining;
FIG. 9 is a three-station machined bolt;
FIG. 10 is a bolt after four-station machining;
fig. 11 is an enlarged view at Y in fig. 10.
In FIGS. 1-11:
1-first punch die, 2-first punch die thimble, 3-first die, 4-first groove, 5-first die thimble, 6-second punch die, 7-second punch die thimble, 8-second die, 9-second groove, 10-second die thimble, 11-first gradually-expanding opening, 12-second gradually-expanding opening, 13-third punch die, 14-first arc groove, 15-first ring groove, 16-third groove, 17-third die, 18-third die thimble, 19-bulge, 20-fourth punch die, 21-second arc groove, 22-die shell, 23-die core, 24-fourth die thimble, 25-second ring groove, 26-annular bulge, 27-fourth groove, 28-first rod part, 29-second rod part, 30-head flange, 31-polish rod, 32-third rod part and 33-oil groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide a method and a device for processing the large pan head oil groove bolt, wherein the die in the method and the device for processing the large pan head oil groove bolt has long service life, high efficiency of producing the large pan head oil groove bolt and strong product consistency, and improves the product quality.
Referring to fig. 1 to 11, fig. 1 is a flowchart illustrating a method for machining a large pan head oil groove bolt according to the present invention; FIG. 2 is a schematic view of a first pressing part and a first female die provided in the present invention; FIG. 3 is a schematic view of a second extrusion and a second die provided in the present invention; FIG. 4 is a schematic view of a third extrusion and a third cavity die provided in the present invention; FIG. 5 is a schematic view of a fourth extrusion and a fourth die provided in the present invention; FIG. 6 is an enlarged view at X in FIG. 5; FIG. 7 is a bolt after a station process; FIG. 8 is a bolt after two-station machining; FIG. 9 is a three-station machined bolt; FIG. 10 is a bolt after four-station machining; fig. 11 is an enlarged view at Y in fig. 10.
A machining method for a large pan head oil groove bolt comprises the following steps:
s1: selecting raw materials for processing bolts;
s2: putting the raw material into a cold header, and using the cold header to header a rod part of the raw material;
s3: upsetting the head of the raw material by using a cold header, and upsetting a chamfer at the bottom of the rod part;
s4: upsetting a head flange 30 of a raw material by using a cold header, and upsetting a polish rod 31 between the head flange 30 and a rod part;
s5: an oil groove 33 at the lower portion of the head flange 30 is upset using a cold heading machine.
It should be noted that, the above steps are respectively performed at different stations, and all materials are put into the cold header in a closed forward extrusion manner at different stations, so as to extrude the rod part at the lower part of the raw material, the head flange 30 at the top, the chamfer at the bottom of the rod part, the polish rod 31 between the head flange 30 and the rod part, and the oil groove 33 at the lower part of the head flange 30.
For preliminary cold-heading when using the cold heading machine to upset out the pole portion of raw and other materials, pole portion and off-the-shelf pole portion this moment have certain difference, later through many times cold-heading with the pole portion cold-heading for unanimous with off-the-shelf pole portion, the surplus portion that is used for processing the head is reserved to pole portion top this moment, the shape can be the bar, length direction is unanimous with the length direction of pole portion.
In cold heading the head of the raw material, the above-mentioned remaining portion may be cold headed into a shape closer to the head flange 30, for example, an ellipsoidal shape, and cold headed to a chamfer at the bottom of the rod portion, further cold heading the rod portion, making the shape of the rod portion closer to the finished product.
When the head flange 30 is subjected to cold heading, the head flange 30 is subjected to cold heading to be in the shape of a finished product, the rod part is further subjected to cold heading, the rod part is further close to the finished product or consistent with the finished product, the step shape required to be arranged on the rod part can be subjected to cold heading, and the polish rod 31 is subjected to cold heading.
Finally, the lower portion of the head flange 30 of the raw material having the polished rod 31 is cold headed to form the oil groove 33.
This application is through using the cold heading machine, utilizing the cold heading technology to come out with the chamfer of the pole portion of bolt, head flange 30, pole portion bottom, polished rod 31 between head flange 30 and the pole portion and the oil groove 33 cold heading of head flange 30 lower part, improves the mould life by a wide margin, and oil groove 33 size uniformity is good, has improved production efficiency, has shortened manufacturing cycle, practices thrift the cost, improves the profit to guarantee the stable production of large batch bolt.
On the basis of the above embodiment, as a further preferable aspect, the upsetting method of the stem portion of the raw material by the cold header by putting the raw material into the cold header includes:
the raw material is put into the first die 3 of the cold header, and the rod portion of the raw material is upset by the first extruding portion.
It should be noted that, the first female die 3 and the first extrusion part are arranged at a station, the first female die 3 is opposite to the first extrusion part, the first extrusion part can move towards or away from the first female die 3, when the first extrusion part moves towards the raw material in the first female die 3, the raw material is extruded by the first extrusion part and the first female die 3, the rod part of the lower part of the raw material is subjected to cold heading, then the first extrusion part moves away from the first female die 3, the raw material is taken out to be processed at the next station, and the first extrusion part is operated to move in the whole process, so that the operation is accurate and rapid.
On the basis of the above embodiment, as a further preferable mode, the first pressing section includes the first die 1 and the first die ejector pin 2 that projects out of the first die 1; upsetting out the stem with the first extrusion, comprising:
the raw material in the first die 3 is upset out of the stem portion by the first die 1 and the first die ejector pin 2.
The first die ejector pin 2 is disposed in the first die 1, a front end of the first die ejector pin 2 protrudes out of the first die 1, the front end of the first die 1 is opposite to a front end of the first die 3, the first die ejector pin 2 faces the raw material in the first die 3, and when the first die 1 moves toward the first die 3, the first die ejector pin 2 faces the raw material and applies an extrusion force to the raw material, so that a lower portion of the raw material is extruded in the first die 3 to form the rod portion. In the embodiment, the first die ejector pin 2 is adopted to apply extrusion force to the raw material, so that the extrusion force applied to the raw material can be increased, and the raw material is easier to mold.
On the basis of the above embodiment, as a further preferable mode, after the raw material is put into the first die 3 of the cold heading machine and the rod portion is headed by the first extruding portion, the method includes:
a first groove 4 is formed in the first female die 3, a first through hole is formed in the bottom of the first groove 4, a first female die ejector pin 5 is movably arranged in the first through hole, and raw materials upset out of the rod portion are ejected out of the first groove 4 through the first female die ejector pin 5.
It should be noted that the first groove 4 is substantially identical to the shape of the bolt to be processed, the bottom of the first groove is provided with a first through hole, during extrusion molding, the position of a first die ejector pin 5 arranged in the first through hole is fixed, the front end of the first die ejector pin 5 and the front end of the first through hole are located on the same vertical plane, during processing of the rod portion, the raw material forms the side surface of the rod portion on the side surface of the first groove 4, and the bottom surface is a plane attached to the front end surface of the first die ejector pin 5. And when the first die ejector pin 2 leaves the raw material, the raw material is ejected out by the first die ejector pin 5. In the embodiment, the first female die ejector pin 5 is used for ejecting the raw materials, so that the raw materials can be taken out conveniently, and the forming surface of the raw materials cannot be damaged.
On the basis of the above embodiment, as a further preferable aspect, the upsetting of the head portion of the raw material by the cold header and the upsetting of the rod portion, the upsetting of the chamfer of the bottom portion of the rod portion, includes:
and (3) putting the raw material subjected to the rough upsetting into a second female die 8 of the cold upsetting machine, upsetting the head of the raw material by using the second extrusion part and the second female die 8, upsetting the first rod part 28 into a second rod part 29, and upsetting the bottom of the rod part into a first chamfer.
It should be noted that the second female die 8 and the second extrusion portion are disposed at two stations, the second female die 8 is opposite to the second extrusion portion, the second extrusion portion can move towards or away from the second female die 8, when the second extrusion portion moves towards the raw material in the second female die 8, the raw material is extruded by the second extrusion portion and the second female die 8, the head of the top of the raw material is upset, the first rod portion 28 is precisely upset into the second rod portion 29, the bottom of the rod portion is upset into the first chamfer, the shape of the head, the shape and the size of the second rod portion 29 and the first chamfer can be set according to actual processing conditions, and then the second extrusion portion moves away from the second female die 8, and the raw material is taken out to be processed at a next station. The overall shape of the raw materials in the embodiment is closer to the shape of a finished product, and the whole process can be realized by operating the second extrusion part to move accurately and quickly.
On the basis of the above embodiment, as a further preferred option, a second groove 9 is arranged in the second die 8, a first round table surface for upsetting a first chamfer is arranged on the inner wall of the bottom of the second groove 9, a second through hole is arranged at the bottom of the second groove 9, a second die thimble 10 is movably arranged in the second through hole, and the front end of the second die thimble 10 and the front end of the second through hole are located on the same vertical plane; the front end of the second punch die 6 is provided with a first gradually-expanding opening 11, the front end of the second groove 9 is provided with a second gradually-expanding opening 12, and the first gradually-expanding opening 11 is opposite to the large-diameter end of the second gradually-expanding opening 12; utilize second extrusion portion and second die 8 to upset out the head of raw and other materials to upset first pole portion 28 for second pole portion 29, upset out first chamfer with the pole portion bottom, include:
the head of the raw material is upset by the second die 6, the first gradually expanding opening 11, the second gradually expanding opening 12, and the second die 8, the first rod part 28 is finish-upset into the second rod part 29 by the second die 6, the second die 8, the second groove 9, the first land, and the second die ejector pin 10, and the bottom of the second rod part 29 is upset into the first chamfer.
The second die 7 is provided with an ejector pin on the second die 6, the front end of the ejector pin of the second die 7 is recessed into the second die 6, the bottom surface of the first gradually expanding opening 11 is the front end surface of the ejector pin of the second die 7, the front end of the second die 6 is opposite to the front end of the second die 8, the ejector pin of the second die 7 faces the raw material in the second die 8, when the second die 6 moves toward the raw material in the second die 8, the first gradually expanding opening 11 moves toward the second gradually expanding opening 12, the first gradually expanding opening 11 faces the raw material in the second gradually expanding opening 12 and applies a pressing force to the raw material, so that the raw material forms a head portion between the first gradually expanding opening 11 and the second gradually expanding opening 12.
The rear end of the first round table surface is the front end of the second through hole, the front end of the first round table surface is connected with the side wall of the second groove 9, the diameter of the rear end of the first round table surface is smaller than the inner diameter of the front end, and raw materials can be attached to the first round table surface to form the round table surface when being extruded, namely, the first chamfer angle.
In the embodiment, the second die 7 is adopted to apply the extrusion force to the raw material by the thimble, so that the extrusion force applied to the raw material can be increased, and the raw material is easier to form.
During extrusion forming, the position of a second female die ejector pin 10 arranged in the second through hole is fixed, and the front end of the second female die ejector pin 10 and the front end of the second through hole are positioned on the same two vertical surfaces. When the second die 6 is separated from the raw material, the raw material is ejected by the second die ejector pin 10. In the embodiment, the second female die ejector pin 10 is used for ejecting the raw materials, so that the raw materials can be taken out conveniently, and the forming surface of the raw materials cannot be damaged.
On the basis of the above embodiment, as a further preferable aspect, the use of a cold header for finish-upsetting a head into a head flange 30, finish-upsetting a rod, and upsetting a polish rod 31 between the head flange 30 and the rod includes:
and placing the raw material subjected to fine upsetting to form the second rod part 29, upsetting to form the head part and upsetting to form the first chamfer into a third female die 17 of the cold header, performing fine upsetting to form the head part flange 30 from the head part of the raw material by using the third extrusion part and the third female die 17, and performing fine upsetting to form the second rod part 32 from the second rod part 29, forming the first chamfer into the second chamfer and upsetting to form the polish rod 31 between the head part flange 30 and the rod part.
It should be noted that the third die 17 and the third extrusion portion are disposed at three stations, the third die 17 is opposite to the third extrusion portion, the third extrusion portion can move towards or away from the third die 17, when the third extrusion portion moves towards the raw material in the third die 17, the raw material is extruded by the third extrusion portion and the third die 17, the head of the top of the raw material is cold-headed into the head flange 30, the second rod portion 29 is fine-headed into the third rod portion 32, the first chamfer is fine-headed into the second chamfer, the shape of the head flange 30, the shape and size of the third rod portion 32, and the second chamfer can be set according to actual processing conditions, and then the third extrusion portion moves away from the third die 17, and the raw material is taken out to the next station for processing. The overall shape of the raw materials in the embodiment is closer to the shape of a finished product, and the whole process can be realized by operating the third extrusion part to move accurately and quickly.
On the basis of the above embodiment, as a further preferable mode, a third groove 16 is provided in the third die 17, a second round table surface for upsetting the first chamfer into a second chamfer is provided on the inner wall of the bottom of the third groove 16, a third through hole is provided at the bottom of the third groove 16, a third die thimble 18 is movably provided in the third through hole, the front end of the third die thimble 18 and the front end of the third through hole are on the same vertical plane, a first annular groove 15 with an inner diameter larger than that of the third groove 16 is provided at the front end of the third groove 16, the third extrusion part includes a third die 13 and a first arc-shaped groove 14 provided at the end of the third die 13, and a convex part 19 is provided at the middle part of the first arc-shaped groove 14; utilize third extrusion portion and third die 17 to be the head flange 30 with raw and other materials head fine upsetting to second pole portion 29 is third pole portion 32, is the second chamfer fine upsetting to first chamfer, include:
the head of the raw material is finish-headed into a head flange 30 by the third die 13, the first arc-shaped groove 14, the boss 19, and the third die 17, the stem 31 is upset by the third die 13, the third die 17, and the annular groove, the second stem 29 is finish-headed into a third stem 32 by the third die 13, the third die 17, and the third groove 16, and the first chamfer is finish-headed into a second chamfer.
It should be noted that the front end of the first arc-shaped groove 14 is opposite to the front end of the third die 17, the convex portion 19 faces the raw material in the third die 17, the raw material fills the first arc-shaped groove 14 to form the head flange 30 when the third die 13 moves towards the raw material in the third die 17, the convex portion 19 presses into the head flange 30 to form a groove in the upper portion of the head flange 30, and the raw material is pressed in the first annular groove 15 to fill the first groove 4, so that the polished rod 31 is formed.
The rear end of the second circular table surface is the front end of the third through hole, the front end of the second circular table surface is connected with the side wall of the third groove 16, the diameter of the rear end of the second circular table surface is smaller than the inner diameter of the front end, and raw materials can be attached to the second circular table surface to form the circular table surface when being extruded, namely, the second chamfer angle.
In the embodiment, the third punch 13 is adopted to apply the extrusion force to the raw material by the thimble, so that the extrusion force applied to the raw material can be increased, and the raw material is easier to form.
During extrusion forming, the position of a third female die ejector pin 18 arranged in the third through hole is fixed, and the front end of the third female die ejector pin 18 and the front end of the third through hole are positioned on the same vertical plane. When the third die 13 is away from the raw material, the raw material is ejected by the third die ejector pin 18. In the embodiment, the third female die ejector pin 18 is used for ejecting the raw materials, so that the raw materials are convenient to take out, and the forming surface of the raw materials cannot be damaged.
In addition to the above embodiments, as a further preferable aspect, the oil groove 33 formed at the lower portion of the head flange 30 by using the cold heading machine includes:
and placing the raw materials for upsetting the head flange 30, the third rod part 32, the second chamfer and the polish rod 31 into a fourth female die of the cold header, and upsetting an oil groove 33 by using a fourth extrusion part and the fourth female die.
It should be noted that the fourth female die and the fourth extrusion portion are arranged at four stations, the fourth female die is opposite to the fourth extrusion portion, the fourth extrusion portion can move towards or away from the fourth female die, and when the fourth extrusion portion moves towards the fourth female die, the raw material is extruded by the fourth extrusion portion and the fourth female die, and the oil groove 33 is upset. The whole shape of the raw materials in the embodiment is the shape of a finished product, and the whole process is accurate and quick only by operating the fourth extrusion part to move.
On the basis of the above embodiment, as a further preference, the fourth pressing portion includes a fourth die 20, a second arc-shaped groove 21 for accommodating the head flange 30 is provided at the front end of the fourth die 20, a fourth groove 27 is provided in the fourth die, a fourth through hole is provided at the bottom of the fourth groove 27, a fourth die thimble 24 is movably provided in the fourth through hole, a second annular groove 25 for accommodating the polish rod 31 is provided at the front end of the fourth groove 27, an annular protrusion 26 is provided on the outer end surface of the second annular groove 25, and the inner diameter of the annular protrusion 26 is consistent with the inner diameter of the front end of the fourth groove 27; utilize fourth extrusion portion and fourth die to upset out oil groove 33, include:
the oil groove 33 is upset by the fourth die 20, the second arc-shaped groove 21, the fourth concave die and the annular protrusion 26.
It should be noted that the front end of the second arc-shaped groove 21 is opposite to the front end of the third die 17, the boss 19 faces the raw material in the third die 17, the head flange 30 enters the second arc-shaped groove 21, the polish rod 31 enters the second annular groove 25 when the third die 13 moves toward the raw material in the third die 17, and the annular boss 26 19 is pressed into the lower portion of the head flange 30 to form the oil groove 33 in the lower portion of the head flange 30. The fourth concave die comprises a concave die shell 22 and a concave die core 23, and the fourth groove 27 and the fourth concave die thimble 24 are both arranged in the concave die core 23.
The present embodiment uses the annular protrusion 26 to apply a pressing force to the raw material, so as to increase the pressing force applied to the raw material, so that the raw material can be more easily molded.
During extrusion forming, the position of a fourth female die ejector pin 24 arranged in the fourth through hole is fixed, and the front end of the fourth female die ejector pin 24 and the front end of the fourth through hole are positioned on the same four vertical surfaces. When the fourth die 20 is moved away from the stock material, the stock material is ejected by a fourth die ejector pin 24. In the embodiment, the fourth female die ejector pin 24 is used for ejecting the raw materials, so that the raw materials can be taken out conveniently, and the forming surface of the raw materials cannot be damaged.
In addition to the method for processing the large pan head oil groove bolt, the invention also provides a device for processing the large pan head oil groove bolt, which comprises the following steps: the machine body, the control system, be used for the first cold heading portion of thick heading raw and other materials pole portion, be used for thick heading out the head of raw and other materials, and the smart heading pole portion, the second cold heading portion of the chamfer of upset pole portion bottom, be used for with the head smart heading for head flange 30, the smart heading pole portion, and the third cold heading portion of the polished rod 31 between head flange 30 and the pole portion, the fourth cold heading portion of oil groove 33 that is used for upsetting head flange 30 lower part, and the access mechanism that is used for taking out and putting into the second cold heading portion raw and other materials in the first cold heading portion, the access mechanism is still used for taking out and putting into the third cold heading portion raw and other materials in the second cold heading portion, take out and put into the fourth cold heading portion raw and other materials in the third cold heading portion, first cold heading portion, second cold heading portion, third cold heading portion and fourth cold heading portion all set up in the machine body, access mechanism's movably setting in the machine body, first cold heading portion, second cold heading portion, the head, And the third cold heading part, the fourth cold heading part and the access mechanism are in signal connection with the control system.
It should be noted that, control system control first cold-heading portion is preliminary cold-heading when upsetting out the pole portion of raw and other materials, and pole portion and the off-the-shelf pole portion at this moment have certain difference, and the surplus portion that is used for processing the head is reserved to pole portion top this moment, and the shape can be the bar, and length direction is unanimous with the length direction of pole portion, later through the finish-heading of second cold-heading portion and third cold-heading portion with the pole portion finish-heading for unanimous with off-the-shelf pole portion.
In cold heading the head of the raw material, the control system controls the second cold heading portion to cold-heading the above-mentioned remaining portion into a shape closer to the head flange 30, for example, an ellipsoidal shape, and cold-heading a chamfer at the bottom of the rod portion, further cold heading the rod portion, making the shape of the rod portion closer to the finished product.
When the head flange 30 is subjected to cold heading, the control system controls the third cold heading part to perform cold heading on the head flange 30 into a shape of a finished product, the rod part is further subjected to cold heading, the rod part is further close to the finished product or consistent with the finished product, the step shape required to be arranged on the rod part can be subjected to cold heading, and the polish rod 31 is subjected to cold heading.
Finally, the control system controls the fourth cold heading section to cold heading the lower portion of the head flange 30 of the raw material having the polished rod 31 to the oil sump 33.
This application passes through the first cold heading of control system control, the second cold heading, third cold heading and fourth cold heading are to raw and other materials cold heading, control access mechanism takes out the raw and other materials in the first cold heading and put into the second cold heading, take out the raw and other materials in the second cold heading and put into the third cold heading, take out the raw and other materials in the third cold heading and put into the fourth cold heading, utilize the cold heading technology with the pole portion of bolt, head flange 30, the chamfer of pole portion bottom, polish rod 31 between head flange 30 and the pole portion and the oil groove 33 cold heading of head flange 30 lower part come out, improve the mould life-span by a wide margin, oil groove 33 size uniformity is good, and the production efficiency is improved, the manufacturing cycle is shortened, the cost is saved, the profit is improved, and guarantee the stable production of large batch bolt.
On the basis of the above embodiment, as a further preferable mode, the first cold heading portion includes a first die 3 and a first die 1, the first die 1 is provided with a first die ejector pin 2, a front end of which protrudes out of a front end of the first die 1, a first groove 4 is provided in the first die 3, the first groove 4 is arranged opposite to the first die ejector pin 2, a first through hole is provided at a bottom of the first groove 4, and a first die ejector pin 5 is movably provided in the first through hole.
The first die ejector pin 2 is disposed in the first die 1, a front end of the first die ejector pin 2 protrudes out of the first die 1, the front end of the first die 1 is opposite to a front end of the first die 3, the first die ejector pin 2 faces the raw material in the first die 3, and when the first die 1 moves toward the first die 3, the first die ejector pin 2 faces the raw material and applies an extrusion force to the raw material, so that a lower portion of the raw material is extruded in the first die 3 to form the rod portion. In the embodiment, the first die ejector pin 2 is adopted to apply extrusion force to the raw material, so that the extrusion force applied to the raw material can be increased, and the raw material is easier to mold.
The first groove 4 is substantially consistent with the shape of a bolt to be processed, a first through hole is formed in the bottom of the first groove, a first female die ejector pin 5 arranged in the first through hole is fixed in position during extrusion forming, the front end of the first female die ejector pin 5 and the front end of the first through hole are located on the same vertical surface, when a rod portion is processed, raw materials form the side surface of the rod portion on the side surface of the first groove 4, and the bottom surface is a plane attached to the front end face of the first female die ejector pin 5. And when the first die ejector pin 2 leaves the raw material, the raw material is ejected out by the first die ejector pin 5. In the embodiment, the first female die ejector pin 5 is used for ejecting the raw materials, so that the raw materials can be taken out conveniently, and the forming surface of the raw materials cannot be damaged.
On the basis of the above embodiment, as a further preferable mode, the second cold heading portion includes a second die 8 and a second die 6, the second die 6 is provided with a second die ejector pin 7 whose front end is recessed into the front end of the second die 6, a second groove 9 is provided in the second die 8, the second groove 9 is arranged opposite to the second die ejector pin 7, the bottom of the second groove 9 is provided with a second through hole, a second die ejector pin 10 is movably provided in the second through hole, and the bottom inner wall of the second groove 9 is provided with a first circular table surface for upsetting out the first chamfer.
The second die ejector pin 7 is provided in the second die 6, the front end of the second die ejector pin 7 is recessed into the second die 6, the front end of the second die 6 is opposite to the front end of the second die 8, and the second die ejector pin 7 faces the raw material in the second die 8.
The rear end of the first round table surface is the front end of the second through hole, the front end of the first round table surface is connected with the side wall of the second groove 9, the diameter of the rear end of the first round table surface is smaller than the inner diameter of the front end, and raw materials can be attached to the first round table surface to form the round table surface when being extruded, namely, the first chamfer angle.
In the embodiment, the second die ejector pin 7 is adopted to apply the extrusion force to the raw material, so that the extrusion force applied to the raw material can be increased, and the raw material is easier to mold.
During extrusion forming, the position of a second female die ejector pin 10 arranged in the second through hole is fixed, and the front end of the second female die ejector pin 10 and the front end of the second through hole are positioned on the same two vertical surfaces. When the second die 6 is separated from the raw material, the raw material is ejected by the second die ejector pin 10. In the embodiment, the second female die ejector pin 10 is used for ejecting the raw materials, so that the raw materials can be taken out conveniently, and the forming surface of the raw materials cannot be damaged.
In addition to the above embodiments, as a further preferable mode, the front end of the second die 6 is provided with a first gradually expanding opening 11, the front end of the second groove 9 is provided with a second gradually expanding opening 12, and the first gradually expanding opening 11 is opposed to the large diameter end of the second gradually expanding opening 12.
It should be noted that the bottom surface of the first divergent opening 11 is the front end surface of the second die thimble 7, and when the second die 6 moves toward the raw material in the second groove 9, the first divergent opening 11 moves toward the second divergent opening 12, and the first divergent opening 11 faces the raw material in the second divergent opening 12 and applies a pressing force to the raw material, so that the raw material forms a head portion between the first divergent opening 11 and the second divergent opening 12. The head that forms in this embodiment is more close with the flange head shape of finished product, is favorable to in the subsequent handling with the head cold-heading for the flange head.
On the basis of the above embodiment, as a further preferable option, the third cold heading portion includes a third concave die 17 and a third die 13, a third groove 16 is disposed in the third concave die 17, the third groove 16 is disposed opposite to the third die 13, a third through hole is disposed at the bottom of the third groove 16, a third concave die thimble 18 is movably disposed in the third through hole, the front end of the third concave die thimble 18 and the front end of the third through hole are located on the same vertical plane, the front end of the third groove 16 is provided with a first annular groove 15 having an inner diameter larger than the inner diameter of the third groove 16 and used for processing the polish rod, the front end of the third die 13 is provided with a first arc-shaped groove 14 used for processing the head flange, a convex portion 19 is disposed in the middle of the first arc-shaped groove 14, and the inner wall of the bottom of the third groove 16 is provided with a second circular table surface used for cold heading the first chamfer into the second chamfer.
It should be noted that the front end of the first arc-shaped groove 14 is opposite to the front end of the third concave die 17, the convex part 19 is opposite to the raw material in the third concave die 17, the raw material fills the first arc-shaped groove 14 when the third die 13 moves towards the raw material in the third concave die 17 to form the head flange, the convex part 19 is pressed into the head flange to form the groove on the upper part of the head flange, and the raw material is pressed in the first annular groove 15 to fill the first groove 4, so that the polished rod is formed.
The rear end of the second circular table surface is the front end of the third through hole, the front end of the second circular table surface is connected with the side wall of the third groove 16, the diameter of the rear end of the second circular table surface is smaller than the inner diameter of the front end, and raw materials can be attached to the second circular table surface to form the circular table surface when being extruded, namely, the second chamfer angle.
In the embodiment, the third punch 13 is adopted to apply the extrusion force to the raw material by the thimble, so that the extrusion force applied to the raw material can be increased, and the raw material is easier to form.
During extrusion forming, the position of a third female die ejector pin 18 arranged in the third through hole is fixed, and the front end of the third female die ejector pin 18 and the front end of the third through hole are positioned on the same vertical plane. When the third die 13 is away from the raw material, the raw material is ejected by the third die ejector pin 18. In the embodiment, the third female die ejector pin 18 is used for ejecting the raw materials, so that the raw materials are convenient to take out, and the forming surface of the raw materials cannot be damaged.
On the basis of the above embodiment, as a further preference, the inner wall of the third groove 16 at the front end of the second circular truncated cone surface is further provided with at least one annular step surface, all the annular step surfaces face the front end of the third groove 16, and all the annular step surfaces are arranged along the axial direction of the third groove 16.
The annular step surface is provided to machine an annular step on the outer periphery of the rod portion, so as to be suitable for an installation scene. The rod part is extruded in the third groove 16, and the side wall is attached to the annular step surface to form an annular step. Of course, other structures may be machined on the outer circumference of the rod portion according to the actual installation scenario.
On the basis of the above embodiment, as a further preferable mode, the fourth die comprises a fourth die 20, a second arc-shaped groove 21 for accommodating the head flange is arranged at the front end of the fourth die 20, a fourth groove 27 is arranged in the fourth die, a fourth through hole is arranged at the bottom of the fourth groove 27, a fourth die thimble 24 is movably arranged in the fourth through hole, a second annular groove 25 for accommodating the polish rod is arranged at the front end of the fourth groove 27, an annular protrusion 26 is arranged on the outer end surface of the second annular groove 25, and the inner diameter of the annular protrusion 26 is consistent with the inner diameter of the front end of the fourth groove 27.
It should be noted that the front end of the second arc-shaped groove 21 is opposite to the front end of the third die 17, the convex portion 19 faces the raw material in the third die 17, the head flange enters the second arc-shaped groove 21 when the third die 13 moves towards the raw material in the third die 17, the polish rod enters the second annular groove 25, and the annular convex portion 26 is pressed into the lower portion of the head flange to form an oil groove in the lower portion of the head flange.
The fourth concave die comprises a concave die shell 22 and a concave die core 23, and the fourth groove 27 and the fourth concave die thimble 24 are both arranged in the concave die core 23.
The present embodiment uses the annular protrusion 26 to apply a pressing force to the raw material, so as to increase the pressing force applied to the raw material, so that the raw material can be more easily molded.
During extrusion forming, the position of a fourth female die ejector pin 24 arranged in the fourth through hole is fixed, and the front end of the fourth female die ejector pin 24 and the front end of the fourth through hole are positioned on the same four vertical surfaces. When the fourth die 20 is moved away from the stock material, the stock material is ejected by a fourth die ejector pin 24. In the embodiment, the fourth female die ejector pin 24 is used for ejecting the raw materials, so that the raw materials can be taken out conveniently, and the forming surface of the raw materials cannot be damaged.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The method and the device for processing the large pan head oil groove bolt provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A machining method for a large pan head oil groove bolt is characterized by comprising the following steps:
selecting raw materials for processing bolts;
placing the raw material into a cold header, and using the cold header to roughly header a rod part of the raw material;
roughly upsetting the head of the raw material by using the cold header, finely upsetting the rod and upsetting a chamfer at the bottom of the rod;
using the cold header to finish-upset the head into a head flange (30), finish-upset the stem, and upset a polish rod (31) between the head flange (30) and the stem;
and upsetting an oil groove (33) at the lower part of the head flange (30) by using the cold header.
2. The method of claim 1, wherein the step of placing the stock material into a cold heading machine and using the cold heading machine to rough-upset a shank portion of the stock material comprises:
and putting the raw material into a first female die (3) of the cold header, and roughly upsetting the raw material into a first rod part (28) by using a first extruding part.
3. The machining method of the large pan head oil groove bolt according to claim 2, wherein the first extrusion part comprises a first stamping die (1) and a first stamping die thimble (2) protruding out of the first stamping die (1), a first groove (4) is formed in the first female die (3), a first through hole is formed at the bottom of the first groove (4), and a first female die thimble (5) is movably arranged in the first through hole; utilizing first extrusion portion to upset out the pole portion includes:
and roughly upsetting the raw material in the first groove (4) to form the first rod part (28) by using the first die (1), the first die ejector pin (2), the first die (3) and the first die ejector pin (5).
4. The method of claim 2, wherein said upsetting the head of the stock material and the rod and upsetting the chamfer at the bottom of the rod with the cold header comprises:
and (3) roughly upsetting out the raw material behind the rod part, putting the raw material into a second female die (8) of the cold header, upsetting out the head of the raw material by utilizing a second extrusion part and the second female die (8), and upsetting the first rod part (28) into the second rod part (29) and upsetting the bottom of the rod part to form a first chamfer.
5. The machining method for the large pan head oil groove bolt according to claim 4, characterized in that a second groove (9) is formed in the second female die (8), a first round table surface for upsetting the first chamfer is arranged on the inner wall of the bottom of the second groove (9), a second through hole is formed in the bottom of the second groove (9), a second female die thimble (10) is movably arranged in the second through hole, and the front end of the second female die thimble (10) and the front end of the second through hole are located on the same vertical plane; the front end of the second punch die (6) is provided with a first gradually-expanding opening (11), the front end of the second groove (9) is provided with a second gradually-expanding opening (12), and the first gradually-expanding opening (11) is opposite to the large-diameter end of the second gradually-expanding opening (12); utilize the second extrusion portion with second die (8) will the head of raw and other materials is upset out, and will first pole portion (28) fine upsetting be second pole portion (29), will the pole portion bottom is upset out first chamfer, includes:
utilize second die (6), first flaring shape opening (11), second flaring shape opening (12) with second die (8) will the head of raw and other materials is upset out, utilize second die (6) second die (8) second recess (9) first round platform face with second die thimble (10) will first pole portion (28) fine upsetting be second pole portion (29) and will the first chamfer of upsetting out of the bottom of second pole portion (29).
6. The method of machining large pan head sump bolts of claim 4, wherein said using said cold header to finish-upset said head into a head flange (30), finish-upset said shank, and upset out a polish rod (31) between said head flange (30) and said shank comprises:
will the smart heading play second pole portion (29), heading the head and heading out after the first chamfer raw and other materials are put into in third die (17) of cold heading machine, utilize the third extrusion portion with third die (17) will the head smart heading of raw and other materials does head flange (30), and will second pole portion (29) smart heading is third pole portion (32), will first chamfer smart heading is second chamfer, heading out head flange (30) with between the pole portion polished rod (31).
7. The method for machining a large pan head oil groove bolt according to claim 6, a third groove (16) is arranged in the third female die (17), a second round table surface for precisely upsetting the first chamfer into the second chamfer is arranged on the inner wall of the bottom of the third groove (16), a third through hole is arranged at the bottom of the third groove (16), a third concave die thimble (18) is movably arranged in the third through hole, the front end of the third female die thimble (18) and the front end of the third through hole are positioned on the same vertical surface, the front end of the third groove (16) is provided with a first annular groove (15) with the inner diameter larger than that of the third groove (16), the third extrusion part comprises a third stamping die (13) and a first arc-shaped groove (14) arranged at the end part of the third stamping die (13), and a convex part (19) is arranged in the middle of the first arc-shaped groove (14); utilize the third extrusion portion with third die (17) will raw and other materials head fine upsetting is head flange (30), and will second pole portion (29) fine upsetting is third pole portion (32), will first chamfer fine upsetting is the second chamfer, includes:
utilize third die (13) first arc recess (14) bellying (19) third die (17) will the head of raw and other materials is precisely upset to head flange (30), utilizes third die (13) third die (17) and the ring channel is upset polish rod (31), utilizes third die (13) third die (17) with third recess (16) will second pole portion (29) is precisely upset to third pole portion (32), and will the benefit first chamfer is precisely upset to the second chamfer.
8. The method of claim 6, wherein upsetting the oil groove (33) at the lower portion of the head flange (30) using the cold header comprises:
the head flange (30), the third rod part (32), the second chamfer and the polished rod (31) are upset, the raw materials are placed into a fourth concave die of the cold header, and a fourth extrusion part and the fourth concave die are utilized to upset the oil groove (33).
9. The machining method for the large pan head oil groove bolt according to claim 8, wherein the fourth extrusion part comprises a fourth punch die (20), a second arc-shaped groove (21) for accommodating the head flange (30) is arranged at the front end of the fourth punch die (20), a fourth groove (27) is arranged in the fourth die, a fourth through hole is arranged at the bottom of the fourth groove (27), a fourth die ejector pin (24) is movably arranged in the fourth through hole, a second annular groove (25) for accommodating the polish rod (31) is arranged at the front end of the fourth groove (27), an annular protrusion (26) is arranged on the outer end surface of the second annular groove (25), and the inner diameter of the annular protrusion (26) is consistent with the inner diameter of the front end of the fourth groove (27); utilize the fourth extrusion portion with the fourth die is upset out oil groove (33), include:
upsetting the oil groove (33) by using the fourth die (20), the second arc-shaped groove (21), the fourth concave die and the annular protrusion (26).
10. The utility model provides a processingequipment of big coiled hair oil groove bolt which characterized in that includes: fuselage, control system, be used for the first cold heading portion of thick heading raw and other materials pole portion, be used for thick heading play the head of raw and other materials, and the smart heading the pole portion, heading play the second cold heading portion of the chamfer of pole portion bottom, be used for with the head smart heading is head flange (30), smart heading pole portion and heading out head flange (30) with the third cold heading portion of polished rod (31) between the pole portion, be used for heading out the fourth cold heading portion of oil groove (33) of head flange (30) lower part and be used for with in the first cold heading portion raw and other materials take out and put into the access mechanism of second cold heading portion, access mechanism still be used for with in the second cold heading portion raw and other materials take out and put into the third cold heading portion, will in the third cold heading portion raw and other materials take out and put into in the fourth cold heading portion, first cold heading portion, The second cold heading portion third cold heading portion and fourth cold heading portion all set up in the fuselage, access mechanism mobilizable set up in the fuselage, first cold heading portion the second cold heading portion the third cold heading portion the fourth cold heading portion reaches access mechanism all with control system signal connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011401159.6A CN112548022A (en) | 2020-12-04 | 2020-12-04 | Method and device for machining oil groove bolt with large pan head |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011401159.6A CN112548022A (en) | 2020-12-04 | 2020-12-04 | Method and device for machining oil groove bolt with large pan head |
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| CN112548022A true CN112548022A (en) | 2021-03-26 |
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| CN202011401159.6A Pending CN112548022A (en) | 2020-12-04 | 2020-12-04 | Method and device for machining oil groove bolt with large pan head |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113560483A (en) * | 2021-07-28 | 2021-10-29 | 常熟市标准件厂有限公司 | Ultrashort-specification chamfering method |
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2020
- 2020-12-04 CN CN202011401159.6A patent/CN112548022A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113560483A (en) * | 2021-07-28 | 2021-10-29 | 常熟市标准件厂有限公司 | Ultrashort-specification chamfering method |
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