CN109433988B - Continuous stamping and forging forming process and die for conical counter bore - Google Patents
Continuous stamping and forging forming process and die for conical counter bore Download PDFInfo
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- CN109433988B CN109433988B CN201811279224.5A CN201811279224A CN109433988B CN 109433988 B CN109433988 B CN 109433988B CN 201811279224 A CN201811279224 A CN 201811279224A CN 109433988 B CN109433988 B CN 109433988B
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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
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
- B21J5/025—Closed die forging
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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
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/10—Piercing billets
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Abstract
The invention discloses a conical counter bore continuous stamping and forging forming process and a die, which comprise a female die, wherein four stations are arranged on the female die; at a first station: punching a through hole with a quincunx shape; at a second station: pressing a conical hole with an angle slightly smaller than the final conical surface angle; at a third station: flattening in the reverse direction; at a fourth station: and (6) trimming the hole. The invention adopts the progressive die, the strip material is automatically fed and continuously stamped and formed, and the forming efficiency is high; the problems of hole bursting, large change of the external dimension and the like in the traditional conical counter bore punching and forging forming can be prevented; the precision of the finished piece is improved, the rejection rate is reduced, and the manufacturing cost is reduced.
Description
Technical Field
The invention belongs to the technical field of stamping and forging forming, and particularly relates to a conical counter bore stamping and forging forming process and a die.
Background
The conical counter bore is commonly used for installing bolts or other connecting parts, and has the function of enabling the bolt head to be embedded into a part without exceeding parts, so that the use performances such as appearance, rotation and the like are not influenced.
The traditional conical counter bore is generally machined, has the problems of low production efficiency and high cost, and is very passive when facing mass production.
The metal plate is stamped and formed, for example, several processes of bottom hole punching, counter sink pressing, hole punching, bottom hole punching, counter sink pressing, center hole trimming and the like can be used for producing a shallow conical counter sink, but when the method is used for producing a conical counter sink on a medium-thickness plate, the problems of hole spalling, overlarge change of the external dimension of a workpiece, size overproof and the like caused by excessive outward flowing of materials when the counter sink is pressed are easily caused.
Disclosure of Invention
The invention aims to provide a continuous stamping and forging forming process and a continuous stamping and forging forming die for a conical counter bore, so as to solve the technical problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
A conical counter bore continuous stamping and forging forming die comprises a female die, wherein four stations are arranged on the female die;
At a first station: a first station of the female die is provided with a punching die hole, and a first male die is correspondingly arranged on the punching die hole; the first station is also provided with a plate-shaped first blank holder for pressing the blank; a first through hole with the aperture larger than that of the first male die is formed in the center of the first blank holder, so that the first male die can penetrate through the first through hole;
At a second station: a second station of the female die is provided with a press prefabricated conical counter sink die hole, and a second male die with a circular truncated cone at the front end is correspondingly arranged on the press prefabricated conical counter sink die hole; a second plate-shaped blank holder for pressing the blank is arranged on the second station; a second through hole with the diameter larger than that of the second male die is formed in the center of the second blank holder, so that the second male die can penetrate through the second through hole;
At a third station: the third station of the female die is a plane; a powerful pressing plate is arranged above the third station of the female die, and a circular truncated cone is arranged at the lower part of the powerful pressing plate; the conical surface angles of the circular truncated cone and the final conical countersunk hole are the same;
At a fourth station: a fourth station of the female die is provided with a hole repairing die hole; a cylindrical hole trimming male die and a third blank holder are arranged above the fourth station; the bottom of the third blank holder is provided with a boss, and the third blank holder is provided with a third through hole through which a hole repairing male die can pass; the third through hole penetrates through the center of the boss.
Furthermore, the first male die is matched with the punching die hole, so that the aperture of a pre-hole obtained by punching the blank is larger than the small-opening diameter of the final conical counter sink and smaller than the large-opening diameter of the final conical counter sink.
Furthermore, the cross sections of the first male die and the punching die hole are both in a quincunx shape, and the cross section of the pre-hole is similar to the quincunx shape, so that the material can flow towards the center when the conical surface is pressed in the subsequent process.
Further, the angle of the circular truncated cone of the second male die is 100-200 smaller than the angle of the conical surface of the finally obtained conical counter sink.
Furthermore, the diameter of the die hole for pressing the prefabricated conical counter sink is larger than the maximum diameter of the die hole for punching, but smaller than the diameter of the large opening of the conical surface of the prefabricated conical counter sink, and the orifice of the die hole for pressing the prefabricated conical counter sink is provided with a fillet, so that the material can conveniently flow into the die hole for pressing the prefabricated conical counter sink.
Further, the diameter of the hole trimming male die is the same as the diameter of the small end of the final conical counter sink.
Furthermore, a hole trimming die hole on a fourth station of the female die is in tolerance fit with the male die.
Furthermore, the lower part of the powerful pressing plate is provided with a circular truncated cone, the center of the circular truncated cone is provided with a fourth through hole, and the bottom of the circular truncated cone is a cambered surface, so that materials can smoothly flow to the center when the bulge of the working procedure piece obtained at the second station is reversely pressed.
A continuous punching forging forming process for a conical counter bore comprises the following steps:
And 4, repairing a center hole: and (3) pressing the process piece obtained in the step (3) on a fourth station of the female die by using a third blank holder, punching a central hole of the blank by using a cylindrical hole trimming male die, and removing redundant metal materials in the center of the central hole to obtain a final conical counter sink.
Compared with the prior art, the invention has the following beneficial effects:
1. The continuous die is adopted, the strip materials are automatically fed and continuously stamped and forged, and the forming efficiency is high.
2. The problems of hole bursting, large change of the external dimension and the like in the traditional conical counter bore punching and forging forming process can be prevented.
3. The precision of the finished piece is improved, the rejection rate is reduced, and the manufacturing cost is reduced.
Drawings
FIG. 1 is a schematic structural view of a first station of a continuous punch forging forming die for a conical counter bore according to the invention;
FIG. 2 is a cross-sectional shape of a pre-hole of the present invention;
FIG. 3 is a schematic structural view of a second station of the continuous punch forging forming die for the conical counter bore according to the invention;
FIG. 4 is a schematic structural view of a third station of the continuous punch forging forming die for the conical counter bore according to the invention;
FIG. 5 is an enlarged fragmentary view of a third station of the present invention;
FIG. 6 is a schematic structural view of a fourth station of the continuous punch forging forming die for a conical counter bore according to the present invention;
Fig. 7 is a schematic structural view of the blank of the present invention after being formed through steps 1 to 4.
Detailed Description
The invention relates to a conical counter bore continuous forging forming die which comprises a female die 2, wherein four stations are arranged on the female die 2;
Referring to fig. 1, at the first station: a punching die hole 21 is formed in a first station of the female die 2, and a first male die 1 is correspondingly arranged on the punching die hole 21; the first station is also provided with a plate-shaped first blank holder 3 for pressing the blank 10; the center of the first blank holder 3 is provided with a first through hole with the aperture larger than that of the first male die so as to allow the first male die 1 to pass through. The first male die 1 is matched with the punching die hole 21 to ensure that the aperture of the pre-hole 101 obtained by punching the blank 10 is larger than the small hole diameter of the final conical counter sink and smaller than the large opening diameter of the final conical counter sink. The cross-sectional shape of the pre-hole 101 is a quincunx shape as shown in fig. 2.
Referring to fig. 3, at the second station: a second station of the female die 2 is provided with a press prefabricated conical counter sink die hole 22, and the press prefabricated conical counter sink die hole 22 is correspondingly provided with a second male die 11 with a circular truncated cone at the front end; a plate-shaped second blank holder 31 for pressing the blank 10 is also arranged on the second station; the center of the second blank holder 31 is provided with a second through hole with a diameter larger than that of the second male die 11, so that the second male die 11 can pass through the second through hole. The angle of the circular truncated cone of the second male die 11 is 10-20 degrees smaller than the angle of the conical surface of the finally obtained conical countersunk hole. The diameter of the press-prefabricating conical counter-bore die hole 22 of the second station of the female die 2 is larger than the maximum diameter of the punching die hole 21 but smaller than the diameter of the large conical surface of the prefabricated conical counter-bore die hole, and the orifice of the press-prefabricating conical counter-bore die hole 22 is provided with a small round angle, so that the material can flow into the press-prefabricating conical counter-bore die hole 22 conveniently.
Referring to fig. 4 and 5, at the third station: the third station of the female die 2 is a plane; a strong pressing plate 4 is arranged above the third station of the female die 2, and a circular truncated cone 41 is arranged at the lower part of the strong pressing plate 4; the conical surface angles of the circular truncated cone 41 and the final conical countersunk hole are the same. The center of the circular truncated cone 41 is provided with a fourth through hole, the bottom of the circular truncated cone 41 is an arc surface, so that when the bulge 111 of the working procedure piece obtained at the second station is pressed reversely, the material can smoothly flow to the center, and a free flow space is always reserved.
Referring to fig. 6, at the fourth station: a hole trimming die hole 23 is formed in the fourth station of the female die 2; a cylindrical hole trimming male die 5 and a third blank holder 33 are arranged above the fourth station; the bottom of the third blank holder 33 is provided with a boss 330, and the third blank holder 33 is provided with a third through hole 3300 through which the hole repairing punch 5 can pass; the third through hole 3300 penetrates the center of the boss 330; the diameter of the hole trimming male die 5 is the same as that of the small end of the final conical counter sink, and a hole trimming die hole 23 on the fourth station of the female die 2 is in tolerance fit with the male die 5.
The invention relates to a continuous stamping and forging forming process of a conical counter bore, which comprises the following steps:
Referring to fig. 1, a blank 10 is pressed on a first station of a female die 2 by a first blank holder 3, a first male die 1 punches the blank 10 to obtain a process part with a pre-hole 101, and the size of the male die and the female die of the process ensures that the aperture of the obtained pre-hole 101 is larger than the small hole diameter of a final conical counter sink and smaller than the large opening diameter of the final conical counter sink.
The cross-sectional shape of the pre-hole 101 is a quincunx shape as shown in fig. 2.
Referring to FIG. 3, a pre-tapered counterbore 110 with a slightly smaller angle is then forged in step 2. Transferring the process piece with the pre-hole 101 obtained in the process 1 to a second station, wherein a die hole 22 for pressing and prefabricating a conical counter bore is formed in the second station of the female die 2; after the second blank holder 31 presses the working part, the second punch 11 with the circular truncated cone at the front end downwards presses a prefabricated conical counter sink 110, wherein the angle of the circular truncated cone of the second punch 11 is 10 smaller than that of the finally obtained conical counter sink 0-200. The diameter of the press-prefabricating conical counter-bore die hole 22 at the second station of the female die 2 is larger than the maximum bore diameter of the punching die hole 21 but smaller than the diameter of the large conical mouth of the press-prefabricating conical counter-bore die hole, and the orifice of the press-prefabricating conical counter-bore die hole 22 is provided with a small round angle.
The metal of the work piece is forced to flow as far down into the press preformed tapered counter-sunk die holes 22 to form the protrusions 111, or to flow centrally rather than outwardly resulting in hole spalling and excessive dimensional change.
Referring to fig. 4 and 5, the work piece obtained in step 2 is sent to a third station, and the protrusions 111 of the work piece finally obtained in step 2 are reversely flattened by the powerful flattening plate 4 and the conical surface of the preformed conical counter-sunk hole 110 is shaped. Because the conical surface with the angle of 10 degrees to 20 degrees smaller than that of the final conical counter sink is formed in the preorder, the flattening process adopts the powerful pressing plate 4, the powerful pressing plate 4 is provided with the circular truncated cone 41, the angle of the conical surface of the circular truncated cone 41 is the same as that of the conical surface of the final conical counter sink, the center of the circular truncated cone 41 is provided with a fourth through hole, the bottom of the circular truncated cone 41 is an arc surface, the circular truncated cone 41 firstly enters the prefabricated conical counter sink 110 formed in the preorder and flattens a workpiece, the bulge 111 on the process part is bent upwards in the reverse direction and then is attached to the die surface of the circular truncated cone 41 on the powerful pressing plate.
Therefore, the material can flow to the center, and a free flowing space is always available, so that the problems of orifice cracking, overlarge change of the external dimension of a workpiece and the like caused by excessive outflow of the material are prevented.
And 4, repairing a center hole:
Referring to fig. 6, the third blank holder 33 presses the process piece obtained in step 3 on the fourth station of the female die 2, the cylindrical hole trimming male die 5 punches the central hole of the blank 10, and the excess metal material in the center of the central hole is removed to obtain the final tapered counter sink 200; the diameter of the hole trimming male die 5 in the working procedure is the same as that of the small end of the final conical counter sink, and a hole trimming die hole 23 on the fourth station of the female die 2 is in tolerance fit with the male die 5.
The process is mainly used for trimming the center hole to obtain the conical counter sink with smooth surface and accurate size of the center hole.
Claims (10)
1. The continuous punching forging forming process of the conical counter bore is characterized by comprising the following steps of:
Step 1, punching: the first blank holder (3) presses the blank (10) on a first station of the female die (2), and the first male die (1) punches the blank (10) to obtain a process part with a pilot hole (101);
Step 2, pressing the prefabricated conical counter bored hole: transferring the process piece with the pre-hole (101) obtained in the step 1 to a second station; after the second blank holder (31) presses the working piece, a second punch (11) with a circular truncated cone at the front end downwards presses a prefabricated conical counter sink (110), and part of metal of the working piece downwards flows into a die hole (22) for pressing the prefabricated conical counter sink to form a protrusion (111); the cone angle of the prefabricated conical counter sink (110) is smaller than that of the final conical counter sink;
Step 3, flattening: conveying the process piece obtained in the step 2 to a third station, reversely flattening the bulge (111) of the process piece finally obtained in the step 2 by adopting a strong pressing plate (4), and shaping the prefabricated conical counter sink (110);
And 4, repairing a center hole: and (3) pressing the process piece obtained in the step (3) on a fourth station of the female die (2) by using a third blank holder (33), punching the central hole of the blank (10) by using a cylindrical hole trimming male die (5), and removing redundant metal materials in the center of the central hole to obtain the final conical counter sink (200).
2. The continuous stamping and forging forming process of the conical countersunk hole as claimed in claim 1, wherein the continuous stamping and forging forming die of the conical countersunk hole is adopted to carry out continuous stamping and forging forming on the blank to obtain the final conical countersunk hole (200); the continuous punching and forging forming die for the conical counter bore comprises:
The device comprises a female die (2), wherein four stations are arranged on the female die (2);
At a first station: a punching die hole (21) is formed in a first station of the female die (2), and a first male die (1) is correspondingly arranged on the punching die hole (21); the first station is also provided with a plate-shaped first blank holder (3) for pressing the blank (10); a first through hole with the aperture larger than that of the first male die (1) is formed in the center of the first blank holder (3) so that the first male die (1) can penetrate through the first through hole;
At a second station: a second station of the female die (2) is provided with a prefabricated conical counter sink die hole (22), and a second male die (11) with a circular truncated cone at the front end is correspondingly arranged on the prefabricated conical counter sink die hole (22); a second plate-shaped blank holder (31) for pressing the blank (10) is arranged on the second station; a second through hole with the diameter larger than that of the second male die (11) is formed in the center of the second blank holder (31) so that the second male die (11) can penetrate through the second through hole;
At a third station: the third station of the female die (2) is a plane; a powerful pressing plate (4) is arranged above the third station of the female die (2), and a circular truncated cone (41) is arranged at the lower part of the powerful pressing plate (4); the conical surface angle of the circular truncated cone (41) is the same as that of the final conical countersunk hole;
At a fourth station: a hole trimming die hole (23) is arranged on the fourth station of the female die (2); a cylindrical hole trimming male die (5) and a third blank holder (33) are arranged above the fourth station; a boss (330) is arranged at the bottom of the third blank holder (33), and a third through hole (3300) through which the hole repairing punch (5) can pass is arranged on the third blank holder (33); the third through hole (3300) penetrates through the center of the boss (330).
3. The continuous punch forging process of the conical counter bore according to the claim 1, characterized in that the first punch (1) is matched with the punching die hole (21) to make the diameter of the pre-hole (101) obtained by punching the blank (10) larger than the small opening diameter of the final conical counter bore and smaller than the large opening diameter of the final conical counter bore; the angle of the circular truncated cone of the second punch (11) is 10-20 degrees smaller than the angle of the conical surface of the finally obtained conical countersunk hole; the diameter of the die hole (22) for pressing the prefabricated conical counter sink is larger than the maximum aperture of the punching die hole (21) but smaller than the diameter of the large opening of the conical surface of the prefabricated conical counter sink, and the orifice of the die hole for pressing the prefabricated conical counter sink die hole (22) is provided with a fillet, so that materials can conveniently flow into the die hole (22) for pressing the prefabricated conical counter sink die hole.
4. The continuous stamping and forging forming die for the conical counter bores is characterized by comprising a female die (2), wherein four stations are arranged on the female die (2);
At a first station: a punching die hole (21) is formed in a first station of the female die (2), and a first male die (1) is correspondingly arranged on the punching die hole (21); the first station is also provided with a plate-shaped first blank holder (3) for pressing the blank (10); a first through hole with the aperture larger than that of the first male die (1) is formed in the center of the first blank holder (3) so that the first male die (1) can penetrate through the first through hole;
At a second station: a second station of the female die (2) is provided with a prefabricated conical counter sink die hole (22), and a second male die (11) with a circular truncated cone at the front end is correspondingly arranged on the prefabricated conical counter sink die hole (22); a second plate-shaped blank holder (31) for pressing the blank (10) is arranged on the second station; a second through hole with the diameter larger than that of the second male die (11) is formed in the center of the second blank holder (31) so that the second male die (11) can penetrate through the second through hole;
At a third station: the third station of the female die (2) is a plane; a powerful pressing plate (4) is arranged above the third station of the female die (2), and a circular truncated cone (41) is arranged at the lower part of the powerful pressing plate (4); the conical surface angle of the circular truncated cone (41) is the same as that of the final conical countersunk hole;
At a fourth station: a hole trimming die hole (23) is arranged on the fourth station of the female die (2); a cylindrical hole trimming male die (5) and a third blank holder (33) are arranged above the fourth station; a boss (330) is arranged at the bottom of the third blank holder (33), and a third through hole (3300) through which the hole repairing punch (5) can pass is arranged on the third blank holder (33); the third through hole (3300) penetrates through the center of the boss (330).
5. The continuous punch forming die for the tapered counter bored according to claim 4, wherein the first punch (1) is fitted to the punch hole (21) so that the pilot hole (101) obtained by punching the blank (10) has a diameter larger than the minor diameter of the final tapered counter bored and smaller than the major diameter of the final tapered counter bored.
6. The continuous punch forging die for the tapered countersunk head as claimed in claim 4, wherein the angle of the truncated cone of the second punch (11) is 10 ° to 20 ° smaller than the angle of the tapered surface at which the tapered countersunk head is finally obtained.
7. The continuous press forging die for conical counter bored holes as claimed in claim 4, wherein the diameter of the press-prepared conical counter bored hole (22) is larger than the maximum diameter of the punch bored hole (21) but smaller than the diameter of the tapered opening of the press-prepared conical counter bored hole, and the opening of the press-prepared conical counter bored hole (22) is rounded to facilitate the flow of the material into the press-prepared conical counter bored hole (22).
8. The continuous punch forging die for the conical counter bore according to claim 4, wherein the diameter of the hole trimming punch (5) is the same as the diameter of the small end of the final conical counter bore.
9. The continuous punch forging forming die for the conical counter bore according to claim 4, wherein a circular truncated cone (41) is arranged at the lower part of the powerful pressing plate (4); a fourth through hole is formed in the center of the circular truncated cone (41); the bottom of the round table (41) is an arc surface.
10. The continuous punch forging die for the tapered counter bored hole as claimed in claim 5, wherein the cross-sectional shape of the pilot hole (101) is a quincunx shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811279224.5A CN109433988B (en) | 2018-10-30 | 2018-10-30 | Continuous stamping and forging forming process and die for conical counter bore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811279224.5A CN109433988B (en) | 2018-10-30 | 2018-10-30 | Continuous stamping and forging forming process and die for conical counter bore |
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| CN109433988A CN109433988A (en) | 2019-03-08 |
| CN109433988B true CN109433988B (en) | 2020-07-17 |
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| CN201811279224.5A Active CN109433988B (en) | 2018-10-30 | 2018-10-30 | Continuous stamping and forging forming process and die for conical counter bore |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110216163B (en) * | 2019-07-04 | 2020-10-27 | 西北工业大学 | Conical nozzle bushing plate integral impact extrusion composite forming die and forming method |
| CN114192670B (en) * | 2021-12-10 | 2023-10-20 | 西安建筑科技大学 | Continuous stamping forming process and die for step counter-sunk holes |
| CN114178402B (en) * | 2021-12-10 | 2024-03-15 | 西安建筑科技大学 | Process for reducing abrasion of continuous punching die of connecting plate and die |
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| SU454953A1 (en) * | 1972-07-11 | 1974-12-30 | Проектно-Технологический Научно-Исследовательский Институт Машиностроения И Электротехники | The method of obtaining a hole with a chamfer |
| US4072039A (en) * | 1976-04-30 | 1978-02-07 | Yoshitaka Nakanishi | Method for forming counter-sunk hole in a base material and an apparatus for carrying out the same |
| JPS60137529A (en) * | 1983-12-27 | 1985-07-22 | Amada Metoretsukusu:Kk | Method for forming countersink of platelike member |
| JPH11156457A (en) * | 1997-11-27 | 1999-06-15 | Nikon Corp | Method for forming tapered hole, and manufacture op optical element |
| CN106216489A (en) * | 2016-08-01 | 2016-12-14 | 钜祥精密模具（苏州）有限公司 | A kind of back of the body male counter sink moulding process |
| CN106862374A (en) * | 2017-03-31 | 2017-06-20 | 西安建筑科技大学 | A kind of counter sink press forming die and technique |
| CN108543856A (en) * | 2018-04-03 | 2018-09-18 | 广州华立科技股份有限公司 | A kind of numerical control drilling method of counterbore |
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2018
- 2018-10-30 CN CN201811279224.5A patent/CN109433988B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU454953A1 (en) * | 1972-07-11 | 1974-12-30 | Проектно-Технологический Научно-Исследовательский Институт Машиностроения И Электротехники | The method of obtaining a hole with a chamfer |
| US4072039A (en) * | 1976-04-30 | 1978-02-07 | Yoshitaka Nakanishi | Method for forming counter-sunk hole in a base material and an apparatus for carrying out the same |
| JPS60137529A (en) * | 1983-12-27 | 1985-07-22 | Amada Metoretsukusu:Kk | Method for forming countersink of platelike member |
| JPH11156457A (en) * | 1997-11-27 | 1999-06-15 | Nikon Corp | Method for forming tapered hole, and manufacture op optical element |
| CN106216489A (en) * | 2016-08-01 | 2016-12-14 | 钜祥精密模具（苏州）有限公司 | A kind of back of the body male counter sink moulding process |
| CN106862374A (en) * | 2017-03-31 | 2017-06-20 | 西安建筑科技大学 | A kind of counter sink press forming die and technique |
| CN108543856A (en) * | 2018-04-03 | 2018-09-18 | 广州华立科技股份有限公司 | A kind of numerical control drilling method of counterbore |
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| CN109433988A (en) | 2019-03-08 |
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