CN111014563A - Lower knurling process of extrusion molding screw product head and main die structure - Google Patents
Lower knurling process of extrusion molding screw product head and main die structure Download PDFInfo
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- CN111014563A CN111014563A CN201911373482.4A CN201911373482A CN111014563A CN 111014563 A CN111014563 A CN 111014563A CN 201911373482 A CN201911373482 A CN 201911373482A CN 111014563 A CN111014563 A CN 111014563A
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- main die
- tungsten steel
- mould shell
- screw product
- knurling
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- 238000001125 extrusion Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 22
- 239000010937 tungsten Substances 0.000 claims abstract description 22
- 238000005516 engineering process Methods 0.000 claims abstract description 4
- 238000010008 shearing Methods 0.000 claims description 7
- 238000010009 beating Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000012545 processing Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- 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
- B21K1/50—Trimming or shearing formed heads, e.g. working with dies
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The utility model provides a knurling technology under extrusion screw product head and fundamental mode structure which characterized in that: the first tungsten steel main die sleeve piece (1) and the second tungsten steel main die sleeve piece (2) are vertically overlapped and embedded into a slotted hole (301) in the upper end of a main die mould shell (3) in an interference fit mode, the tungsten steel main die core (4) is embedded into an inner hole groove (401) of the main die (4) in an interference fit mode, the main die (4) is embedded into a hole groove I (302) in the bottom of the main die mould shell (3) in a clearance fit mode, and one end of the second tungsten steel main die sleeve piece (2) is exposed out of a hole groove II (303) in the upper end of the main die mould shell (3). According to the lower knurling process of the extrusion forming screw product head and the main die structure, the die structure with long service life is adopted, the cold heading process of knurling can be directly formed in the cold heading machine in an extrusion forming mode, the production efficiency is improved, and the processing cost is reduced.
Description
Technical Field
The invention belongs to the technical field of metal material forming, and particularly relates to a lower knurling process of an extrusion forming screw product head and a main die structure.
Background
In the mechanical industry, various hardware parts are generally used for machining and mounting, and a fastener is a common hardware part and is a general term for a type of mechanical parts adopted when two or more parts or components are fastened and connected into a whole. The bar pin is one of the fasteners, which is often used for positioning, as well as for connecting and locking elements, and also as an overload shearing element in safety devices. The bar pin is further divided into a cylindrical pin, a conical pin and a cotter pin. A cylindrical pin is fixed in a hole by interference fit and is not suitable to be disassembled more, so that the rod pin can be pressed in place at one time in the assembling process of the rod pin and the hole, which is very important. Automatic production lines are subject to extensive use and the force of insertion is set at each assembly, in which case the dimensional tolerances of the rods and holes and the way of surface treatment need to be controlled strictly to ensure that each assembly is in place.
The automobile fastener is used as an indispensable connecting piece of automobile parts, namely, the automobile is guaranteed to run stably, and the important role of automobile safety is also born. Knurling shaping is the forming mode commonly used of automotive fastener, and the forming mode of knurling under current extrusion screw product head is accomplished through the technology of "cold-heading + knurling", accomplishes processing through twice process, and the work piece needs material loading many times, unloading, waste time, and the manufacturing cost is high, consumes the manpower many, and production efficiency is low.
Disclosure of Invention
The invention aims to provide a lower knurling process of an extrusion molding screw product head and a main die structure aiming at the technical defects of the existing lower knurling molding of the extrusion molding screw product head, and the cold heading process of the extrusion molding screw product head knurling can be directly carried out by a cold heading machine by adopting a die structure with long service life, so that the production efficiency is improved, and the processing cost is reduced.
Technical scheme
In order to achieve the technical purpose, the invention provides a knurling process under the head of an extrusion molding screw product, which is characterized by comprising the following steps of:
(1) selecting a proper diameter of the disc round blank through simulation calculation, and shearing the blank through a shearing device of a cold header;
(2) completing the rod shrinking of the lower end rod part, and simultaneously performing the head part in advance;
(3) necking down the rod part at the lower end again, forming a step at the upper part and pre-upsetting the head part to prepare for forming the flange at the next step;
(4) beating a flange to form a knurled blank;
(5) and forming the knurled blank.
The utility model provides a knurling technology uses fundamental mode structure under extrusion screw product head which characterized in that: the first tungsten steel main die sleeve piece and the second tungsten steel main die sleeve piece are vertically overlapped and embedded into a slotted hole in the upper end of a main die mould shell in an interference fit mode, a tungsten steel main die core is embedded into an inner hole groove of a main die in an interference fit mode, the main die is embedded into a first hole groove in the bottom of the main die mould shell in a clearance fit mode, and the two outer end surfaces of the tungsten steel main die sleeve pieces are not flush with the upper end surface of the main die mould shell, so that a gap is reserved between the end surface of the main die and the end surface of the main die mould shell.
Further, the slotted hole is a taper hole.
Furthermore, the primary die mould shell of the first tungsten steel primary die sleeve sheet and the secondary tungsten steel primary die sleeve sheet is provided with an exhaust groove.
Advantageous effects
According to the lower knurling process of the extrusion forming screw product head and the main die structure, the die structure with long service life is adopted, the cold heading process of knurling can be directly formed in the cold heading machine in an extrusion forming mode, the production efficiency is improved, and the processing cost is reduced.
Drawings
FIG. 1 shows a main mold structure for knurling the lower end of an extruded screw product according to an embodiment of the invention.
Detailed Description
The invention is further explained below with reference to the figures and examples.
Examples
The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of respective portions and their mutual relationships. It should be noted that the drawings are not necessarily drawn to the same scale in order to clearly illustrate the structures of the various elements of the embodiments of the invention. Like reference numerals are used to denote like parts. Further, when the description is made with reference to the drawings, directional words such as "upper", "lower", "front", "rear", and the like are employed for convenience of description, and they do not constitute specific limitations on the structure of the features.
The embodiment designs a knurling process under the head of an extrusion molding screw product, which is characterized by comprising the following steps:
firstly, selecting a proper diameter of a disc round blank through simulation calculation, and shearing the blank through a shearing device of a cold header;
secondly, the rod shrinking of the rod part at the lower end is completed, and the head part is preformed at the same time;
thirdly, necking down the rod part at the lower end again, forming a step at the upper part and pre-upsetting the head part to prepare for forming the flange in the next step;
fourthly, beating a flange to form a knurled blank;
and fifthly, forming the knurled blank.
As shown in fig. 1, a main die structure for a knurling process under an extrusion molding screw product head, wherein a first tungsten steel main die sleeve 1 and a second tungsten steel main die sleeve 2 are vertically overlapped and embedded into a slot hole 301 at the upper end of a main die shell 3 in an interference fit manner, a tungsten steel main die core 4 is embedded into an inner hole groove 501 of a main die 5 in an interference fit manner, the main die 5 is embedded into a first hole groove 302 at the bottom of the main die shell 3 in a clearance fit manner, and the outer end surface of the second tungsten steel main die sleeve 2 is not level with the upper end surface of the main die shell 3, so that a gap is left between the end surface of the main die 5 and the end surface of the main die shell.
The slot 301 is a tapered hole.
According to the lower knurling process of the extrusion forming screw product head and the main die structure, the die structure with long service life is adopted, the cold heading process of knurling can be directly formed in the cold heading machine in an extrusion forming mode, the production efficiency is improved, and the processing cost is reduced.
The embodiment of the knurling process under the head of the extrusion molding screw product and the structure of the main mold of the invention is explained above. The specific features such as shape, size and position of the underhead knurling process and the primary die structure of an extruded screw product of the present invention can be specifically designed by the function of the above disclosed features, and such designs can be realized by those skilled in the art. Moreover, the technical features disclosed above are not limited to the combinations with other features disclosed, and other combinations between the technical features can be performed by those skilled in the art according to the purpose of the invention, so as to achieve the purpose of the invention.
Claims (4)
1. The lower knurling process of the head of an extrusion molding screw product is characterized by comprising the following steps of:
(1) selecting a proper diameter of the disc round blank through simulation calculation, and shearing the blank through a shearing device of a cold header;
(2) completing the rod shrinking of the lower end rod part, and simultaneously performing the head part in advance;
(3) necking down the rod part at the lower end again, forming a step at the upper part and pre-upsetting the head part to prepare for forming the flange at the next step;
(4) beating a flange to form a knurled blank;
(5) and forming the knurled blank.
2. The utility model provides a knurling technology uses fundamental mode structure under extrusion screw product head which characterized in that: the first tungsten steel main die sleeve piece (1) and the second tungsten steel main die sleeve piece (2) are vertically overlapped and embedded into a slotted hole (301) in the upper end of a main die mould shell (3) in an interference fit mode, the tungsten steel main die core (4) is embedded into an inner hole groove (501) in a main die (5) in an interference fit mode, the main die (5) is embedded into a hole groove I (302) in the bottom of the main die mould shell (3) in a clearance fit mode, and the outer end face of the second tungsten steel main die sleeve piece (2) is not parallel and level with the upper end face of the main die mould shell (3) to cause a gap to be reserved between the end face of the main die (5) and the end face of the main die mould shell (3).
3. The main die structure for the underhead knurling process of an extrusion molding screw product as claimed in claim 2, wherein: the slotted hole (301) is a taper hole.
4. The main die structure for the underhead knurling process of an extrusion molding screw product as claimed in claim 2, wherein: exhaust grooves (101, 201, 303) are arranged on the main die mould shell (3) of the first tungsten steel main die sleeve sheet (1) and the second tungsten steel main die sleeve sheet (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911373482.4A CN111014563A (en) | 2019-12-27 | 2019-12-27 | Lower knurling process of extrusion molding screw product head and main die structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911373482.4A CN111014563A (en) | 2019-12-27 | 2019-12-27 | Lower knurling process of extrusion molding screw product head and main die structure |
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| Publication Number | Publication Date |
|---|---|
| CN111014563A true CN111014563A (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911373482.4A Pending CN111014563A (en) | 2019-12-27 | 2019-12-27 | Lower knurling process of extrusion molding screw product head and main die structure |
Country Status (1)
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| CN (1) | CN111014563A (en) |
Citations (11)
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|---|---|---|---|---|
| RU2265494C1 (en) * | 2004-07-19 | 2005-12-10 | Открытое акционерное общество "Белебеевский завод "Автонормаль" | Method for making flanged bolt with shaped head |
| RU2350424C1 (en) * | 2007-10-16 | 2009-03-27 | Открытое акционерное общество "Белебеевский завод "Автонормаль" | Production method of headed bolt allowing internal polyhedron and flange, on cold-upsetting automation |
| CN102601287A (en) * | 2012-03-13 | 2012-07-25 | 苏州新凌高强度紧固件有限公司 | Nest plate of die for hexagon socket cap screws |
| CN102615239A (en) * | 2012-04-17 | 2012-08-01 | 宁波金鹏高强度紧固件有限公司 | Processing process of wheel hub screw bolt for automobile |
| CN104368744A (en) * | 2014-12-01 | 2015-02-25 | 苏州工业园区新凯精密五金有限公司 | Cold heading forming technology of automobile door lock shaft and die structure for lock shaft forming |
| CN205165696U (en) * | 2015-11-05 | 2016-04-20 | 嘉善宝岛模具厂(普通合伙) | Advance return water cold -heading mould for bolt |
| CN207840015U (en) * | 2018-01-17 | 2018-09-11 | 宾科汽车紧固件（昆山）有限公司 | Hexagon flange bolt cold-heading device |
| CN208929116U (en) * | 2018-09-28 | 2019-06-04 | 浙江希安冀汽车零部件有限公司 | A kind of boss bolt cold upsetting die of car |
| CN110102699A (en) * | 2019-04-30 | 2019-08-09 | 山东九佳紧固件股份有限公司 | Head filler screw cold-heading molding processing mold and its processing technology |
| CN209334639U (en) * | 2018-10-26 | 2019-09-03 | 宾科汽车紧固件（昆山）有限公司 | For the molding cold-heading device of positioning bolt |
| CN212121573U (en) * | 2019-12-27 | 2020-12-11 | 上海鸿基金属制品有限公司 | Main die structure for knurling process under head of extrusion-molded screw product |
-
2019
- 2019-12-27 CN CN201911373482.4A patent/CN111014563A/en active Pending
Patent Citations (11)
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| RU2350424C1 (en) * | 2007-10-16 | 2009-03-27 | Открытое акционерное общество "Белебеевский завод "Автонормаль" | Production method of headed bolt allowing internal polyhedron and flange, on cold-upsetting automation |
| CN102601287A (en) * | 2012-03-13 | 2012-07-25 | 苏州新凌高强度紧固件有限公司 | Nest plate of die for hexagon socket cap screws |
| CN102615239A (en) * | 2012-04-17 | 2012-08-01 | 宁波金鹏高强度紧固件有限公司 | Processing process of wheel hub screw bolt for automobile |
| CN104368744A (en) * | 2014-12-01 | 2015-02-25 | 苏州工业园区新凯精密五金有限公司 | Cold heading forming technology of automobile door lock shaft and die structure for lock shaft forming |
| CN205165696U (en) * | 2015-11-05 | 2016-04-20 | 嘉善宝岛模具厂(普通合伙) | Advance return water cold -heading mould for bolt |
| CN207840015U (en) * | 2018-01-17 | 2018-09-11 | 宾科汽车紧固件（昆山）有限公司 | Hexagon flange bolt cold-heading device |
| CN208929116U (en) * | 2018-09-28 | 2019-06-04 | 浙江希安冀汽车零部件有限公司 | A kind of boss bolt cold upsetting die of car |
| CN209334639U (en) * | 2018-10-26 | 2019-09-03 | 宾科汽车紧固件（昆山）有限公司 | For the molding cold-heading device of positioning bolt |
| CN110102699A (en) * | 2019-04-30 | 2019-08-09 | 山东九佳紧固件股份有限公司 | Head filler screw cold-heading molding processing mold and its processing technology |
| CN212121573U (en) * | 2019-12-27 | 2020-12-11 | 上海鸿基金属制品有限公司 | Main die structure for knurling process under head of extrusion-molded screw product |
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