CN114643335A - Reverse upsetting method for automobile steering knuckle - Google Patents
Reverse upsetting method for automobile steering knuckle Download PDFInfo
- Publication number
- CN114643335A CN114643335A CN202210259627.3A CN202210259627A CN114643335A CN 114643335 A CN114643335 A CN 114643335A CN 202210259627 A CN202210259627 A CN 202210259627A CN 114643335 A CN114643335 A CN 114643335A
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- CN
- China
- Prior art keywords
- upsetting
- die
- cavity
- bar stock
- bar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 11
- 238000005242 forging Methods 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 3
- 210000000078 claw Anatomy 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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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
- B21J5/08—Upsetting
-
- 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
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/08—Accessories for handling work or tools
- B21J13/14—Ejecting devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
- B21K1/762—Coupling members for conveying mechanical motion, e.g. universal joints
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention relates to the technical field of steering knuckles, in particular to a reverse upsetting method of an automobile steering knuckle, which comprises the steps of heating a round bar, vertically placing the heated round bar into a lower upsetting die, wherein the lower upsetting die is provided with a lower upsetting cavity, the depth of the lower upsetting cavity is 4-10% of the length of the bar, downwards sleeving an upper upsetting die on the upper part of the bar to limit upsetting and then continuously downwards moving the bar, so that the bar is partially upset between the lower upsetting die and the upper upsetting die, the upper upsetting die is provided with an upper upsetting cavity, the depth of the upper upsetting cavity is 40-60% of the length of the bar, and the method is opposite to the mode of lower end guiding and upper upsetting in the prior art, and the problems that a workpiece is easy to incline and side after the lower die is abraded, the demoulding is difficult, the processing time is long and the like are solved by adopting upper end guiding and lower end upsetting.
Description
Technical Field
The invention relates to the technical field of steering knuckles, in particular to a reverse upsetting method of an automobile steering knuckle.
Background
When the knuckle is processed, the bar stock is upset firstly, and then the bar stock is processed by subsequent processing such as extrusion, pre-forging, finish forging and the like, and some processing needs local upsetting. In local upsetting, the prior art uses a die cavity to limit round steel at the upper part and the lower part of a large end to be upset. This leads to the following problems: 1. a straight line segment is required to be arranged on the lower die for guiding and limiting the round steel, the part is easy to wear, the local part of a die cavity at the position is not round after the part is worn, a workpiece is easy to incline, and further the dislocation is caused during upsetting; 2. because the lower die has a certain depth, the workpiece and the lower die are difficult to demould after upsetting, so that the workpiece is difficult to be firmly grabbed by a mechanical claw and the clamping is unreliable; 3. the upsetting is hot upsetting, the contact time of the workpiece and the lower die is long, on one hand, the temperature of the die is high, on the other hand, the workpiece is cooled quickly, and the subsequent forging is not facilitated.
Disclosure of Invention
The invention aims to provide a reverse upsetting method for an automobile steering knuckle, which is opposite to the lower end guiding and upper part upsetting modes in the prior art, adopts upper end guiding and lower part upsetting and solves the problems of easiness in side deflection, difficulty in demoulding, long processing time and the like of a workpiece after a lower die is worn.
The technical scheme adopted by the invention for solving the technical problems is as follows: a reverse upsetting method for an automobile steering knuckle comprises the steps of heating a round bar stock, vertically placing the round bar stock into a lower upsetting die, arranging a lower upsetting cavity on the lower upsetting die, enabling the bottom of the lower upsetting cavity to be a plane, the plane is transited to the upper surface of the lower upsetting die through a continuous arc chamfer, the depth of the lower upsetting cavity is 4-10% of the length of the bar stock, the upper upsetting die is sleeved on the upper part of the bar stock in a descending way to limit the upsetting and then continuously descends, so that the part of the bar stock between the lower upsetting die and the upper upsetting die is upset, the upper upsetting die is provided with an upper upsetting cavity, the depth of the upper upsetting cavity is 40-60% of the length of the bar stock, the lower edge of the upper upsetting cavity is provided with a chamfer, the cross sectional area of the upper upsetting cavity is gradually reduced from bottom to top, the top of the upper upsetting cavity is a plane, and the plane is in smooth transition with the side surface through the chamfer.
Preferably, the top of the upper upsetting cavity is provided with a material returning ejector rod, the lower end of the material returning ejector rod penetrates through the upper upsetting die, the upper end of the material returning ejector rod is connected with the upper die plate through a nitrogen spring, and the upper upsetting die is fixedly connected with the upper die plate through a connecting plate.
Preferably, the diameter of the bar stock is 100-140mm, the length is 400-550mm, and the length after upsetting is 240-300 mm.
Preferably, the diameter of the lower bottom surface of the upper upsetting cavity is 260mm, and the diameter of the upper top surface of the lower upsetting cavity is 275 mm.
Preferably, after upsetting, the forging is circumferentially clamped from above the lower upsetting die by a clamp and taken out of the lower upsetting die.
The beneficial effects of the invention are: the reverse upsetting method for the automobile steering knuckle comprises the steps of vertically and horizontally placing a bar, guiding the upper end of the bar and upsetting the lower portion of the bar, limiting metal flow at the lower end and the upper end of a workpiece to be finally formed by utilizing chamfers of a lower upsetting cavity and an upper upsetting cavity during upsetting, righting the bar in the forming process, enabling the bar not to incline, and avoiding the upper end and the lower end of the bar from being folded in the mode.
Secondly, because the lower upsetting cavity is deep in depth in the prior art, the workpiece is tightly attached to the lower upsetting cavity, so that the demolding resistance is large, the demolding is difficult, the demolding time is long, and the mechanical claw is not firmly grabbed when grabbing the workpiece easily (incomplete demolding is realized, and the demolding resistance has influence on grabbing the workpiece). In the scheme, the workpiece and the lower upsetting cavity do not need to be demolded, the downward shrinkage arc formed by the lower part of the bar under the action of the lower upsetting cavity is convenient for the mechanical claw to grab the workpiece, and the clamping is firm and reliable.
Thirdly, the demoulding speed is high, the workpiece and the upper upsetting die are demoulded by utilizing the gravity of the workpiece and the material returning ejector rod in the ascending process of the upper upsetting die, and after the upper upsetting die ascends, the mechanical claw can directly extend into the upper upsetting die to grab the workpiece, so that the demoulding time in the prior art is reduced, and the fault is not easy to occur, and the contact time between the workpiece and the die is short. And prior art work piece and mould contact time are long, and the process is consuming time longer, about 25s, lead to the mould temperature higher, and the work piece cooling is fast, has influenced forging quality and mould life, and the work piece is short with the mould contact time after improving, and stability is good, and the production beat is fast, and this process is consuming time within about 10s for the mould temperature is lower, and the work piece cooling is slow.
Fourthly, in the prior art, a straight line section is required to be arranged in a lower upsetting die cavity, the part is easy to wear, the part is not round after being worn, a workpiece is easy to incline, and dislocation is caused during upsetting. The upsetting die on the scheme can be free of straight line segments, automatic guiding is achieved in the advancing process, abrasion is not prone to occurring, and even if abrasion occurs, the influence on the upsetting die is small.
Drawings
FIG. 1 is a schematic structural view of an upsetting die used in a reverse upsetting method of an automobile steering knuckle according to the present invention.
FIG. 2 is a schematic structural diagram of a bar stock processed by the automobile steering knuckle reverse upsetting method before and after upsetting.
Description of reference numerals:
1-lower upsetting die 2-upper upsetting die
3-material returning ejector rod 4-nitrogen spring
And 5, upper template.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific examples, which are not intended to limit the scope of the invention.
As shown in fig. 1 and fig. 2, in the reverse upsetting method for the automobile steering knuckle of the embodiment, a round bar stock is heated and then vertically placed into a lower upsetting die 1, the lower upsetting die 1 is provided with a lower upsetting cavity, the bottom of the lower upsetting cavity is a plane, the plane is transited to the upper surface of the lower upsetting die through a continuous arc-shaped chamfer, the depth of the lower upsetting cavity is 4% -10% of the length of the bar stock, an upper upsetting die 2 is sleeved on the upper portion of the bar stock downwards to limit upsetting and then continuously descends, so that the bar stock is partially upset between the lower upsetting die 1 and the upper upsetting die 2, the upper upsetting die 2 is provided with an upper upsetting cavity, the depth of the upper upsetting cavity is 40% -60%, the lower edge of the upper upsetting cavity is provided with a chamfer, the cross-sectional area of the upper upsetting cavity is gradually reduced from bottom to top, and the top of the upper upsetting cavity is a plane, the plane is in smooth transition with the side surface through a chamfer. As shown in figures 1 and 2, the lower upsetting die cavity is shaped like a plate, a bar is directly and vertically placed on the lower upsetting die in the initial state, the bottom of the bar is formed along the arc-shaped chamfer of the lower upsetting die during upsetting, and only part of the lower end of the bar is contacted with the lower upsetting die after forming. The upper upsetting cavity is bell-shaped. The upsetting process is open forging, the upper upsetting die descends to the lowest point in figure 1, and the bar is mainly upset at the position between the upper upsetting die 2 and the lower upsetting die 1 and partially extends to the chamfer angle of the upper upsetting cavity and the lower upsetting cavity.
Furthermore, a material returning ejector rod 3 is arranged at the top of the upper upsetting cavity, the lower end of the material returning ejector rod 3 penetrates through the upper upsetting die 2, the upper end of the material returning ejector rod 3 is connected with an upper die plate 5 through a nitrogen spring 4, and the upper upsetting die 2 is fixedly connected with the upper die plate 5 through a connecting plate.
Further, the diameter of the bar stock of the embodiment is 125mm, the length is 520mm, and the length after upsetting is 260 mm.
Further, the diameter of the lower bottom surface of the upper upsetting cavity is 260mm, and the diameter of the upper top surface of the lower upsetting cavity is 275 mm.
Further, after the upsetting, the forging is circumferentially held from above the lower upsetting die 1 by a jig and taken out from the lower upsetting die 1.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (5)
1. The reverse upsetting method of the automobile steering knuckle is characterized by comprising the following steps: heating a round bar stock, vertically placing the round bar stock into a lower upsetting die (1), wherein the lower upsetting die (1) is provided with a lower upsetting cavity, the bottom of the lower upsetting cavity is a plane, the plane is transited to the upper surface of a lower upsetting die through a continuous arc chamfer, the depth of the lower upsetting cavity is 4-10% of the length of the bar stock, an upper upsetting die (2) is sleeved on the upper part of the bar stock downwards to limit upsetting and then continuously downwards, so that the part of the bar stock between the lower upsetting die (1) and the upper upsetting die (2) is upset, the upper upsetting die (2) is provided with an upper upsetting cavity, the depth of the upper upsetting cavity is 40-60% of the length of the bar stock, the lower edge of the upper upsetting cavity is provided with a chamfer, the cross sectional area of the upper upsetting cavity is gradually reduced from bottom to top, the top of the upper upsetting cavity is a plane, and the plane is in smooth transition with the side surface through the chamfer.
2. The method for reverse upsetting of an automotive knuckle as recited in claim 1, wherein: the top of the upper upsetting cavity is provided with a material returning ejector rod (3), the lower end of the material returning ejector rod (3) penetrates through the upper upsetting die (2), the upper end of the material returning ejector rod (3) is connected with an upper die plate (5) through a nitrogen spring (4), and the upper upsetting die (2) is fixedly connected with the upper die plate (5) through a connecting plate.
3. The method for reverse upsetting of an automotive knuckle as recited in claim 1, wherein: the diameter of the bar stock is 140mm, the length of the bar stock is 550mm and 400 mm, and the length of the bar stock after upsetting is 300mm and 240 mm.
4. The method for reverse upsetting of an automotive knuckle as recited in claim 1, wherein: the diameter of the lower bottom surface of the upper upsetting cavity is 260mm, and the diameter of the upper top surface of the lower upsetting cavity is 275 mm.
5. The reverse upsetting method for the automobile steering knuckle according to claim 1, wherein: after upsetting, the forging is clamped by a clamp from the upper part of the lower upsetting die (1) along the circumferential direction and taken out of the lower upsetting die (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210259627.3A CN114643335B (en) | 2022-03-16 | 2022-03-16 | Reverse upsetting method for automobile steering knuckle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210259627.3A CN114643335B (en) | 2022-03-16 | 2022-03-16 | Reverse upsetting method for automobile steering knuckle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114643335A true CN114643335A (en) | 2022-06-21 |
| CN114643335B CN114643335B (en) | 2023-12-08 |
Family
ID=81994210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210259627.3A Active CN114643335B (en) | 2022-03-16 | 2022-03-16 | Reverse upsetting method for automobile steering knuckle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114643335B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2051001C1 (en) * | 1993-12-14 | 1995-12-27 | Акционерное общество открытого типа "ГАЗ" | Apparatus for deforming end of rod blank |
| CN201140262Y (en) * | 2007-12-17 | 2008-10-29 | 重庆市合川区渝生精加工厂 | Selective heating continuous upsetting enclosed simple mould for metal bar |
| CN101502866A (en) * | 2009-03-06 | 2009-08-12 | 重庆长征重工有限责任公司 | Method for forging goods train buffer thrust cone |
| CN107931496A (en) * | 2017-11-23 | 2018-04-20 | 湖南高致精工机械有限公司 | A kind of method and upset head mould for processing fixing card |
| CN207343695U (en) * | 2017-10-25 | 2018-05-11 | 重庆专一汽车配件有限公司 | Steel bar local heating jumping-up molding machine |
| CN110328315A (en) * | 2019-08-19 | 2019-10-15 | 中北大学 | Uniform method for upsetting without anisotropy magnesium alloy bar |
| CN113680939A (en) * | 2021-08-28 | 2021-11-23 | 湖北三环锻造有限公司 | T-arm sinking type upsetting die |
-
2022
- 2022-03-16 CN CN202210259627.3A patent/CN114643335B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2051001C1 (en) * | 1993-12-14 | 1995-12-27 | Акционерное общество открытого типа "ГАЗ" | Apparatus for deforming end of rod blank |
| CN201140262Y (en) * | 2007-12-17 | 2008-10-29 | 重庆市合川区渝生精加工厂 | Selective heating continuous upsetting enclosed simple mould for metal bar |
| CN101502866A (en) * | 2009-03-06 | 2009-08-12 | 重庆长征重工有限责任公司 | Method for forging goods train buffer thrust cone |
| CN207343695U (en) * | 2017-10-25 | 2018-05-11 | 重庆专一汽车配件有限公司 | Steel bar local heating jumping-up molding machine |
| CN107931496A (en) * | 2017-11-23 | 2018-04-20 | 湖南高致精工机械有限公司 | A kind of method and upset head mould for processing fixing card |
| CN110328315A (en) * | 2019-08-19 | 2019-10-15 | 中北大学 | Uniform method for upsetting without anisotropy magnesium alloy bar |
| CN113680939A (en) * | 2021-08-28 | 2021-11-23 | 湖北三环锻造有限公司 | T-arm sinking type upsetting die |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114643335B (en) | 2023-12-08 |
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