CN108907050B - Knuckle arm end cold-coining moulding process - Google Patents
Knuckle arm end cold-coining moulding process Download PDFInfo
- Publication number
- CN108907050B CN108907050B CN201810597108.1A CN201810597108A CN108907050B CN 108907050 B CN108907050 B CN 108907050B CN 201810597108 A CN201810597108 A CN 201810597108A CN 108907050 B CN108907050 B CN 108907050B
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- China
- Prior art keywords
- taper hole
- knuckle arm
- hole end
- thickness
- extruding
- 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.)
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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
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
- B21J5/022—Open die forging
-
- 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 present invention relates to knuckle arm technical fields, more particularly to a kind of knuckle arm end cold-coining moulding process, the present invention is by knuckle arm forging molding and after cooling down, taper hole end is put into extrusion die, use two planes up and down at the mode machine-shaping taper hole end of precise extrusion, upper and lower end faces of the forging at taper hole end before precise extrusion are respectively formed a predeformation groove for being less than taper hole, extrusion die is open type pressing mold, to cancel the processing of taper hole end top and bottom, it improves efficiency, reduce cost, in addition, in order to be conducive to extrusion forming and guarantee extruding quality, it avoids cracking, the thickness when present invention is to taper hole end forging molding, thickness when extruding makes improvement, the structure design of forging taper hole lower planes predeformation groove when forging molding, after guaranteeing extruding, the size of product, quality etc. meets product requirement.
Description
Technical field
The present invention relates to knuckle arm technical fields, more particularly to a kind of knuckle arm end cold-coining moulding process.
Background technique
Knuckle arm is called tie rod arm, is the afterbody force transferring part of steering transmission linkage, and knuckle arm is mounted on a left side
On right turn section, other end ball pin is connected with drag link, which is provided with a bellmouth, to guarantee installation accuracy, such as
Attached knuckle arm shown in FIG. 1 is to the two sides processing request of the bellmouth, with a thickness of 34mm, the upper deviation+0.3, lower deviation-
0.3, the surface roughness, flatness, the depth of parallelism of taper hole upper and lower end face also there are certain requirements.The prior art is generally to the taper
The upper and lower surface in hole carries out the machining such as milling face, and it is more that this allows for procedure of processing, improves production cost.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to and provide a kind of knuckle arm end cold-coining molding work
Skill, methodological science, using the upper and lower surface at precise extrusion molding knuckle arm taper hole end, so that processing step be greatly reduced
Suddenly, production efficiency is improved.
The technical solution adopted by the present invention to solve the technical problems is: a kind of cold-coining of knuckle arm end forms work
Skill, by knuckle arm forging molding and after cooling down, taper hole end is put into extrusion die, the thickness direction extrusion forming along taper hole end,
When forging, the thickness at knuckle arm taper hole end is bigger by 2.3%~3.5% than taper hole end after extruding thickness, in the taper hole of knuckle arm
The upper and lower end faces at end are respectively formed a predeformation groove for being less than taper hole, and the depth of the predeformation groove is taper hole end thickness
1%~2%, when extruding, the small 0.5%-1% of the cavity closed thickness of extrusion die thickness more after molding than taper hole end, extrusion die is to open
Formula pressing mold, the taper hole end outside diameter increase for squeezing rear steering joint arm are no more than 1%.
The extrusion die and predeformation groove corresponding position are plane, and metal is to taper hole end outer circle and pre- in extrusion process
Deform the flowing of groove internal diameter direction.
After extruding, the taper hole at taper hole end is processed, taper hole end lower planes are without machining.
When extruding, the press machine used is 1000T fly press, and the material of extrusion die is H13 or 3Cr2W8V, hardness
For HRC48-54.
Knuckle arm is first heat-treated before extrusion, is down to room temperature and clears up surface.
The beneficial effects of the present invention are: a kind of knuckle arm end cold-coining moulding process, the present invention forge knuckle arm
After causing type and cooling down, taper hole end is put into extrusion die, uses two up and down of the mode machine-shaping taper hole end of precise extrusion
Plane, upper and lower end faces of the forging at taper hole end before precise extrusion are respectively formed a predeformation groove for being less than taper hole, squeeze
Mould is that open type pressing mold improves efficiency to cancel the processing of taper hole end top and bottom, cost is reduced, in addition, in order to be conducive to squeeze
Molding and guarantee extruding quality, avoid cracking, the thickness when present invention is to taper hole end forging molding, thickness when squeezing are done
The structure of forging taper hole lower planes predeformation groove designs when improvement, forging molding out, thus after guaranteeing extruding, the ruler of product
Very little, quality etc. meets product requirement.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the knuckle arm of processing of the invention.
Fig. 2 is the enlarged drawing of taper hole end cross-sectional view at A-A in Fig. 1.
1 --- taper hole end 2 --- predeformation groove
3 --- positive stop lug boss.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments, is not reality of the invention
Scope limitation is applied in this.
As shown in Figure 1 and Figure 2, the knuckle arm end cold-coining moulding process of the present embodiment, knuckle arm is forged into
Type and after cooling down, taper hole end is put into extrusion die, the thickness direction extrusion forming along taper hole end, when forging, knuckle arm taper hole
End with a thickness of 35mm, upper and lower ends at the taper hole end of knuckle arm bigger by 2.3%~3.5% than taper hole end after extruding thickness
Face is respectively formed a predeformation groove for being less than taper hole, and the depth of the predeformation groove is the 1%~2% of taper hole end thickness, squeezes
When pressure, the cavity closed of extrusion die is with a thickness of 33.6mm, thickness small 0.5%-1% more after molding than taper hole end, after extruding, knuckle
Arm thickness direction springs back about 0.5mm, taper hole end 34 ± 0.3mm of thickness after molding, and extrusion die is open type pressing mold, part after extruding
Excess metal is filled to taper hole top and bottom predeformation groove, to reduce the amount of flow of excess metal circular direction to outside taper hole, is protected
The taper hole end outside diameter increase that card squeezes rear steering joint arm is no more than 1%, knuckle arm taper hole end when forging in the present embodiment
Thickness takes 35mm, 1mm bigger than taper hole end after extruding thickness or so, is to accurately control pressure-sizing surplus, pressure is very when extruding
Greatly, as surplus is too small, cause roughness unqualified, and the thickness that surplus not only results in greatly taper hole lower planes is unstable
The fixed, depth of parallelism and flatness are overproof, also result in excess metal and flow to taper hole circumferencial direction, make taper hole circle diameter beyond ruler
Very little requirement, while will cause and be cracked on the outside of taper hole.Knuckle arm is integrally put into extrusion die and squeezes by the present invention, main
Will in the way of precise extrusion machine-shaping taper hole end two planes up and down, to improve efficiency, in addition, forging when forging
Predeformation groove structure in taper hole plane convenient for extrusion forming and guarantees extruding quality, avoids cracking, the present invention is to cone
Thickness when nose end forging molding, thickness when squeezing make improvements, so that size, quality of product etc. are after guaranteeing extruding
Meet product requirement.
With the development of precise extrusion technology, a large amount of components more and more use pressure-sizing technique in the industry, still
For the knuckle arm of the technical program, its pressure-sizing technique how is designed, determines forging hair especially in accordance with design feature
Shape, the shape of taper hole face predeformation groove structure, extrusion die profile of base are a technologies to guarantee pressure-sizing quality
Difficult point, therefore, the prior art be all by Milling Process knuckle arm taper hole upper and lower end face, and the application pass through this technology side
Case processes knuckle arm taper hole upper and lower end face, the thickness tolerance of taper hole top and bottom, rough surface by cold-coining technique
Degree, the depth of parallelism, flatness etc. can satisfy design requirement, not need to add taper hole top and bottom according to the prior art
Work improves production efficiency, reduces cost to optimize procedure of processing.
The extrusion die and predeformation groove corresponding position are plane, in extrusion process, extrusion die and predeformation groove
Between be hollow deformation cavity, metal is flowed to taper hole end outer circle and predeformation groove internal diameter direction.The present embodiment is turning to
Predeformation groove is formed in joint arm, and groove is the cavity not being pressurized when pressure-sizing, there are several effects, on the one hand, the groove is small
In taper hole size, subsequent machining is not influenced；Secondly, metal can be flowed to predeformation groove internal diameter direction when pressure-sizing, reduce
Distortional stress；Third is that the groove can accommodate the metal of a part deformation, taper hole outer profile increases unobvious；Fourth is that the groove knot
Structure reduces the extruding area of plane of extrusion forming process, reduces extruding force；Fifth is that prevention extrusion process in, taper hole end metal to
Outer flow volume is excessive, and outer circle swells excessively, causes taper hole end stress to concentrate and generates cracking.
Before extruding, the outline diameter at the taper hole end of knuckle arm is about 57mm, after extruding, the wheel at the taper hole end of knuckle arm
Wide diameter is about 57.5mm.
After extruding, the taper hole at taper hole end is processed, taper hole end lower planes are without machining.
When extruding, the press machine used is 1000T fly press, and the material of extrusion die is H13 or 3Cr2W8V, hardness
For HRC48-54.
Knuckle arm is first heat-treated before extrusion, is down to room temperature and clears up surface, then is squeezed.
As shown in Figure 1, in order to be limited when squeezing to knuckle arm, rapid alignment die cavity, in the another of knuckle arm
There are two positive stop lug boss 3 for one end setting, and positive stop lug boss 3 is to protrude from the small rotary table of workpiece surface.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than the present invention is protected
The limitation of range is protected, although explaining in detail referring to preferred embodiment to the present invention, those skilled in the art are answered
Work as understanding, it can be with modification or equivalent replacement of the technical solution of the present invention are made, without departing from the reality of technical solution of the present invention
Matter and range.
Claims (5)
1. knuckle arm end cold-coining moulding process, it is characterised in that: by knuckle arm forging molding and after cooling down, taper hole end
It is put into extrusion die, the thickness direction extrusion forming along taper hole end, when forging, the thickness at knuckle arm taper hole end is than after extruding
Taper hole end thickness is big by 2.3%~3.5%, and the upper and lower end faces at the taper hole end of knuckle arm are respectively formed a pre- change for being less than taper hole
Connected in star, the depth of the predeformation groove are the 1%~2% of taper hole end thickness, when extruding, the cavity closed thickness ratio of extrusion die
The taper hole end small 0.5%-1% of thickness after molding, extrusion die are open type pressing mold, and the taper hole end outside diameter for squeezing rear steering joint arm increases
It is big to be no more than 1%.
2. cold-coining moulding process in knuckle arm end according to claim 1, it is characterised in that: the extrusion die and forging
Predeformation groove corresponding position described in part is plane, and metal is to taper hole end outer circle and predeformation groove internal diameter direction stream in extrusion process
It is dynamic.
3. cold-coining moulding process in knuckle arm end according to claim 1, it is characterised in that: after extruding, processing cone
The taper hole of nose end, taper hole end lower planes are without machining.
4. cold-coining moulding process in knuckle arm end according to claim 1, it is characterised in that: when extruding, use
Press machine is 1000T fly press, and the material of extrusion die is H13 or 3Cr2W8V, hardness HRC48-54.
5. cold-coining moulding process in knuckle arm end according to claim 1, it is characterised in that: knuckle arm is squeezing
It is preceding to be first heat-treated, be down to room temperature and clear up surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810597108.1A CN108907050B (en) | 2018-06-12 | 2018-06-12 | Knuckle arm end cold-coining moulding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810597108.1A CN108907050B (en) | 2018-06-12 | 2018-06-12 | Knuckle arm end cold-coining moulding process |
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| Publication Number | Publication Date |
|---|---|
| CN108907050A CN108907050A (en) | 2018-11-30 |
| CN108907050B true CN108907050B (en) | 2019-10-18 |
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| CN201810597108.1A Active CN108907050B (en) | 2018-06-12 | 2018-06-12 | Knuckle arm end cold-coining moulding process |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110877091B (en) * | 2019-12-04 | 2021-10-15 | 湖北三环锻造有限公司 | Hot forging forming process method of steering knuckle arm |
| CN114682725B (en) * | 2022-03-15 | 2023-09-22 | 湖北三环锻造有限公司 | Three-jaw type anti-cracking forging cavity die for disc type steering knuckle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3717164B2 (en) * | 2003-01-30 | 2005-11-16 | 株式会社ケー・エフ・シー | Anchor sleeve for concrete and its manufacturing method |
| CN1520950A (en) * | 2003-02-11 | 2004-08-18 | 旭技术株式会社 | Method and apparatus for manufacturing forged piece |
| CN201366480Y (en) * | 2009-03-05 | 2009-12-23 | 芜湖三联锻造有限公司 | Semi-closed pre-forming forging and stamping mold |
| CN103128209B (en) * | 2011-11-28 | 2015-10-28 | 上海重型机器厂有限公司 | The semi-stamping method of argosy crank throw and device |
| TWI473674B (en) * | 2012-06-01 | 2015-02-21 | Thintech Materials Technology Co Ltd | Method for improvement of deformation homogeneity in flat upsetting process |
| CN104139144A (en) * | 2014-08-11 | 2014-11-12 | 贵州航天新力铸锻有限责任公司 | Device for forging forge piece with ellipsoidal shell |
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| CN108907050A (en) | 2018-11-30 |
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