CN108421947B - Closed forging and pressing die - Google Patents
Closed forging and pressing die Download PDFInfo
- Publication number
- CN108421947B CN108421947B CN201810389070.9A CN201810389070A CN108421947B CN 108421947 B CN108421947 B CN 108421947B CN 201810389070 A CN201810389070 A CN 201810389070A CN 108421947 B CN108421947 B CN 108421947B
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- China
- Prior art keywords
- punch
- hole
- die
- counter bore
- guide hole
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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
-
- 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
Abstract
The invention provides a closed forging die which comprises an upper die, an upper die pressure block, an upper punch, a lower die pressure block, a lower punch and a return spring. The upper die is provided with an upper counter bore, an upper guide hole and an upper die cavity. The upper die pressure block is accommodated in the upper counter bore, and a first through hole is formed in the upper die pressure block. The upper punch comprises an upper punch rod part and an upper punch root, and the upper punch rod part sequentially penetrates through the first through hole and the upper guide hole. The lower counter bore, the lower guide hole and the lower die cavity are formed on the lower die. The lower die pressure block is accommodated in the sunken hole, a second through hole is formed in the upper portion of the lower die pressure block, and a return counter bore is formed in the lower portion of the lower die pressure block. The lower punch comprises a lower punch rod part and a lower punch root part, and the lower punch rod part penetrates through the return counter bore, the second through hole and the lower guide hole in sequence. The spring is sleeved on the root of the lower punch, and the outer diameter of the return spring is larger than the aperture of the return counter bore. The closed forging die provided by the invention can ensure the smooth return of the lower punch.
Description
Technical Field
The invention relates to the field of forging dies, in particular to a closed forging die.
Background
The closed forging and pressing die is a common forging and forming die and can realize extrusion forming of automobile parts such as a constant-speed bearing frame, die cavities are formed in an upper die and a lower die of the closed forging and pressing die, and after die assembly is completed, the upper die cavity and the lower die cavity surround to form a complete die cavity with a preset shape. In the forging process, the upper punch in the upper die and the lower punch in the lower die simultaneously extrude the upper end surface and the lower end surface of the workpiece, so that the material of the workpiece flows in the die cavity to realize final extrusion forming.
The closed forging and pressing die in the prior art has the following remarkable defects: when the mold closing pressure is too large or the mold closing pressure is too frequent, the lower punch is upset due to the too large pressure, so that the static friction force between the lower punch and the inner hole wall of the lower die is increased, and the lower punch is difficult to return downwards after the forging is finished.
Disclosure of Invention
In order to solve the technical problems, the invention provides a closed forging die,
the specific technical scheme is as follows:
a closed forging die, comprising:
the upper die comprises an upper die, wherein an upper counter bore which is recessed inwards is formed in the upper end face of the upper die, an upper guide hole is connected below the upper counter bore, the lower end of the upper guide hole expands outwards to form an upper die cavity, and the aperture of the upper counter bore is larger than that of the upper guide hole;
the upper die pressure block is accommodated in the upper counter bore, a first through hole is formed in the upper die pressure block, and the first through hole is communicated with the upper guide hole and is coaxially arranged;
the upper punch comprises a thin upper punch rod part and a thick upper punch root part formed at the upper end of the upper punch rod part, the upper punch rod part sequentially penetrates through the first through hole and the upper guide hole from top to bottom, the diameter of the upper punch root part is larger than the aperture of the first through hole, and when the upper punch moves downwards, the lower end of the upper punch rod part can enter the upper die cavity;
the lower die comprises a lower die, wherein a sunken hole which is recessed inwards is formed in the lower end face of the lower die, a lower guide hole is connected above the lower counter hole, the upper end of the lower guide hole expands outwards to form a lower die cavity, and the aperture of the lower counter hole is larger than that of the lower guide hole;
the lower die pressure block is accommodated in the sunken hole, a second through hole is formed in the upper part of the lower die pressure block, a return counter bore which is coaxial and communicated with the second through hole is formed in the lower part of the lower die pressure block, the aperture of the return counter bore is larger than that of the second through hole, and the second through hole is communicated with the lower guide hole and is coaxially arranged;
the lower punch comprises a thin lower punch rod part and a thick lower punch root part formed at the lower end of the lower punch rod part, the lower punch rod part sequentially penetrates through the return counter bore, the second through hole and the lower guide hole from bottom to top, the diameter of the lower punch root part is smaller than the aperture of the return counter bore, when the lower punch moves upwards, the upper end of the lower punch rod part can enter the lower die cavity, and the upper end of the lower punch root part can enter the return counter bore;
the spring is sleeved on the root of the lower punch, and the outer diameter of the return spring is larger than the aperture of the return counter bore.
In a specific embodiment, the device further comprises a spring sleeve sleeved at the root of the lower punch, the outer diameter of the spring sleeve is smaller than the aperture of the return counter bore, and the spring sleeve is sleeved on the spring sleeve.
In one embodiment, the upper mold cavity and the lower mold cavity enclose an extrusion mold cavity having a predetermined shape after the upper mold and the lower mold are closed.
In one embodiment, the diameter of the upper punch stem matches the diameter of the upper guide hole, and the diameter of the lower punch stem matches the diameter of the lower guide hole.
According to the closed forging die provided by the invention, the reset spring is additionally arranged at the root part of the lower punch and can press the lower punch downwards, so that the lower punch can be successfully withdrawn after the forging is finished.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts. Wherein:
fig. 1 is a schematic structural view of a closed forging die provided by the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, in one embodiment, the closed forging die provided by the present invention comprises an upper die 1, an upper die pressure block 2, an upper punch 3, a lower die 4, a lower die pressure block 5, a lower punch 6, a spring housing 7, a return spring 8, and the like. Specifically, the method comprises the following steps:
an upper counter bore 11 which is recessed inwards is formed in the upper end face of the upper die 1, an upper guide hole 12 is connected below the upper counter bore 11, the lower end of the upper guide hole 12 expands outwards to form an upper die cavity 13, and the aperture of the upper counter bore 11 is larger than that of the upper guide hole 12. The upper counter bore 11 is arranged coaxially with the upper guide hole 12.
The upper die pressure block 2 is accommodated in the upper counterbore 11, in this embodiment, the outer diameter of the upper die pressure block 2 is substantially equal to the diameter of the upper counterbore 11, and therefore the upper die pressure block 2 is in interference fit in the upper counterbore 11. A first through hole is formed in the upper die pressure block 2, and the first through hole is communicated with the upper guide hole 12 up and down and is coaxially arranged.
The upper punch 3 comprises a thin upper punch rod part 31 and a thick upper punch root part 32 formed at the upper end of the upper punch rod part 31, the upper punch rod part 31 sequentially penetrates through the first through hole and the upper guide hole 12 from top to bottom, and the diameter of the upper punch root part 32 is slightly larger than that of the upper counter bore 11.
When the upper punch 3 moves downward, the lower end of the upper punch stem portion 31 can enter the upper die cavity 13 to press the workpiece 100 to be extruded from top to bottom. In this embodiment, the diameter of the upper punch stem 31 is slightly smaller than the diameter of the upper guide hole 12, so that after the lower end of the upper punch stem 31 enters the upper die cavity 13, there is substantially no clearance between the upper punch stem 31 and the wall of the upper guide hole 12, thereby preventing the material of the workpiece from flowing from the upper die cavity 13 into the upper guide hole 12 during the extrusion process.
An inward concave sunken hole 41 is formed in the lower end face of the lower die 4, a lower guide hole 42 is connected above the lower sunken hole 41, the upper end of the lower guide hole 42 expands outwards to form a lower die cavity 43, and the aperture of the lower sunken hole 41 is larger than that of the lower guide hole 42.
The lower die pressure block 5 is accommodated in the lower counterbore 41, and in this embodiment, the outer diameter of the lower die pressure block 5 is substantially equal to the diameter of the lower counterbore 41, so that the lower die pressure block 5 is in interference fit in the lower counterbore 41. A second through hole 52 is formed at the upper part of the lower die pressure block 5, and a return counter bore 51 which is coaxial with and communicated with the second through hole 52 is formed at the lower part of the lower die pressure block 52. The aperture of the return counter bore 51 is larger than that of the second through hole 52, and the second through hole 52 is communicated with the lower guide hole 42 up and down and is coaxially arranged.
The lower punch 6 includes a thin lower punch stem 61 and a thick lower punch root 62 formed at the lower end of the lower punch stem 61, and the lower punch stem 61 penetrates the return counter bore 51, the second through hole 52, and the lower guide hole 42 in this order downward and upward. The diameter of the lower punch root 62 is smaller than the diameter of the return counterbore 51.
When the lower punch 6 moves upward, the upper end of the lower punch rod portion 61 can enter the lower die cavity 43 to press the workpiece 100 to be extruded from bottom to top. In this embodiment, the diameter of the lower punch rod portion 61 is slightly smaller than the diameter of the lower guide hole 42, so that after the upper end of the lower punch rod portion 61 enters the lower die cavity 43, there is substantially no gap between the lower punch rod portion 61 and the hole wall of the lower guide hole 42, thereby preventing the material of the workpiece from flowing from the lower die cavity 43 into the lower guide hole 42 during the pressing process.
With continued reference to fig. 1, after the upper mold 1 and the lower mold 4 are closed, the upper mold cavity 13 and the lower mold cavity 43 enclose a mold cavity matching the target shape of the workpiece 100 to be extruded.
The spring sleeve 7 is sleeved on the lower punch root 62 and can slide up and down along the punch root 62, the outer diameter of the spring sleeve 7 is smaller than the aperture of the return counter bore 51, and the lower end of the spring sleeve 7 is turned outwards to form a horizontal supporting portion 71. The return spring 8 is sleeved on the spring sleeve 7 and extends up and down along the spring sleeve 7, and the outer diameter of the return spring 8 is larger than the aperture of the return counter bore 51. The lower end of the return spring 8 is supported on the supporting portion 71, and the upper end of the return spring 8 is abutted against the lower end surface of the lower die pressure block 5.
With continued reference to FIG. 1, the closed forging die of the present invention operates generally as follows:
step one, placing a workpiece 100 to be extruded into a lower die cavity;
step two, the control system controls the upper die 1 to move downwards until the upper die 1 and the lower die 4 are matched;
and step three, the control system controls the upper punch 3 and the lower punch 6 to respectively extrude the workpiece 100 downwards and upwards so as to realize extrusion forming of the workpiece 100. At this time, the top of the lower punch stem 61 enters into the lower die cavity, synchronously: the upper end of the lower punch root 62 and the upper end of the spring sleeve 7 both extend into the return counter bore 51, and the return spring 8 is compressed;
and step four, after the extrusion forming is completed, the upper die 1 moves upwards for a return stroke. The control system controls the lower punch 6 to move downwards for retraction. Synchronously, the reset spring 8 generates downward resilience force which can press the lower punch 6 downwards, so that the lower punch 6 can obtain additional return power, and the lower punch 6 can be smoothly returned.
The invention has been described above with a certain degree of particularity. It will be understood by those of ordinary skill in the art that the description of the embodiments is merely exemplary and that all changes that come within the true spirit and scope of the invention are desired to be protected. The scope of the invention is defined by the appended claims rather than by the foregoing description of the embodiments.
Claims (3)
1. A closed forging die, comprising:
the upper die comprises an upper die, wherein an upper counter bore which is recessed inwards is formed in the upper end face of the upper die, an upper guide hole is connected below the upper counter bore, the lower end of the upper guide hole expands outwards to form an upper die cavity, and the aperture of the upper counter bore is larger than that of the upper guide hole;
the upper die pressure block is accommodated in the upper counter bore, a first through hole is formed in the upper die pressure block, and the first through hole is communicated with the upper guide hole and is coaxially arranged;
the upper punch comprises a thin upper punch rod part and a thick upper punch root part formed at the upper end of the upper punch rod part, the upper punch rod part sequentially penetrates through the first through hole and the upper guide hole from top to bottom, the diameter of the upper punch root part is larger than the aperture of the first through hole, and when the upper punch moves downwards, the lower end of the upper punch rod part can enter the upper die cavity;
the lower die comprises a lower die, wherein a sunken hole which is recessed inwards is formed in the lower end face of the lower die, a lower guide hole is connected above the lower counter hole, the upper end of the lower guide hole expands outwards to form a lower die cavity, and the aperture of the lower counter hole is larger than that of the lower guide hole;
the lower die pressure block is accommodated in the sunken hole, a second through hole is formed in the upper part of the lower die pressure block, a return counter bore which is coaxial and communicated with the second through hole is formed in the lower part of the lower die pressure block, the aperture of the return counter bore is larger than that of the second through hole, and the second through hole is communicated with the lower guide hole and is coaxially arranged;
the lower punch comprises a thin lower punch rod part and a thick lower punch root part formed at the lower end of the lower punch rod part, the lower punch rod part sequentially penetrates through the return counter bore, the second through hole and the lower guide hole from bottom to top, the diameter of the lower punch root part is smaller than the aperture of the return counter bore, when the lower punch moves upwards, the upper end of the lower punch rod part can enter the lower die cavity, and the upper end of the lower punch root part can enter the return counter bore;
the spring is sleeved on the root part of the lower punch, and the outer diameter of the return spring is larger than the aperture of the return counter bore;
the lower punch is characterized by further comprising a spring sleeve, the spring sleeve is sleeved on the root of the lower punch and can slide up and down along the root of the lower punch, the outer diameter of the spring sleeve is smaller than the aperture of the return counter bore, the lower end of the spring sleeve is turned outwards to form a horizontal supporting portion, the return spring sleeve is arranged on the spring sleeve and can stretch up and down along the spring sleeve, the outer diameter of the return spring is larger than the aperture of the return counter bore, the lower end of the return spring is supported on the supporting portion, and the upper end of the return spring is abutted to the lower end face of the lower die pressure block.
2. The closed forging die of claim 1, wherein the upper die cavity and the lower die cavity enclose an extrusion die cavity having a predetermined shape when the upper die and the lower die are closed.
3. The closed forging die of claim 1, wherein the diameter of the upper punch shank matches the diameter of the upper pilot hole and the diameter of the lower punch shank matches the diameter of the lower pilot hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810389070.9A CN108421947B (en) | 2018-04-27 | 2018-04-27 | Closed forging and pressing die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810389070.9A CN108421947B (en) | 2018-04-27 | 2018-04-27 | Closed forging and pressing die |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108421947A CN108421947A (en) | 2018-08-21 |
| CN108421947B true CN108421947B (en) | 2020-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810389070.9A Active CN108421947B (en) | 2018-04-27 | 2018-04-27 | Closed forging and pressing die |
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Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2774674Y (en) * | 2004-11-18 | 2006-04-26 | 华中科技大学 | Special hydraulic form frame |
| CN100574926C (en) * | 2008-05-21 | 2009-12-30 | 华中科技大学 | Gear-box planetary gear shaping die |
| CN201815618U (en) * | 2009-09-05 | 2011-05-04 | 杨其融 | Precision forging die capable of forging tooth form of straight toothed spur gear |
| CN203292405U (en) * | 2013-03-14 | 2013-11-20 | 江苏森威集团飞达股份有限公司 | Closed internal extrusion forming device |
| CN203091447U (en) * | 2013-03-20 | 2013-07-31 | 龙西新 | Metal plastic forming device with bidirectional extrusion function |
| CN103419002B (en) * | 2013-07-31 | 2016-03-02 | 霍山汇能汽车零部件制造有限公司 | The warm cold precision forming method of large modulus high boss bevel gear |
| CN203853391U (en) * | 2014-05-20 | 2014-10-01 | 江苏森威精锻有限公司 | Bidirectional blocking die rack |
| CN103978058B (en) * | 2014-05-20 | 2015-12-09 | 江苏森威精锻有限公司 | A kind of both-way block mould bases and using method thereof |
| CN204135096U (en) * | 2014-09-11 | 2015-02-04 | 浙江三维大通冷挤压有限公司 | Oil injector body obliterated extrusion mould |
| CN104226707B (en) * | 2014-09-11 | 2017-11-28 | 浙江三维大通精锻科技有限公司 | Oil injector body obliterated extrusion mould |
| CN205763604U (en) * | 2016-07-13 | 2016-12-07 | 霍山汇能汽车零部件制造有限公司 | Cake class part enclosed temperature precision forging mould |
| CN107234203B (en) * | 2017-06-13 | 2020-02-21 | 江苏森威精锻有限公司 | Zero-load forging device for upper punch before block forming |
| CN208245722U (en) * | 2018-04-27 | 2018-12-18 | 江苏大洋精锻有限公司 | A kind of enclosed forge die |
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2018
- 2018-04-27 CN CN201810389070.9A patent/CN108421947B/en active Active
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| CN108421947A (en) | 2018-08-21 |
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