CN112496220A - Closed forging process for flange plate of hub unit - Google Patents
Closed forging process for flange plate of hub unit Download PDFInfo
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- CN112496220A CN112496220A CN202011592625.3A CN202011592625A CN112496220A CN 112496220 A CN112496220 A CN 112496220A CN 202011592625 A CN202011592625 A CN 202011592625A CN 112496220 A CN112496220 A CN 112496220A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000008569 process Effects 0.000 title claims abstract description 29
- 238000005242 forging Methods 0.000 title claims abstract description 22
- 239000000047 product Substances 0.000 claims abstract description 58
- 238000001125 extrusion Methods 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 239000012467 final product Substances 0.000 claims abstract description 5
- 238000004080 punching Methods 0.000 claims abstract description 5
- 238000012545 processing Methods 0.000 claims abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 28
- 229910052757 nitrogen Inorganic materials 0.000 claims description 13
- 238000013461 design Methods 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 7
- 230000006872 improvement Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 9
- 238000009826 distribution Methods 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 description 5
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 238000012356 Product development Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 235000012438 extruded product Nutrition 0.000 description 1
- 238000003754 machining 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
- 239000002699 waste material Substances 0.000 description 1
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Classifications
-
- 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
- B21J5/002—Hybrid process, e.g. forging following casting
-
- 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
- B21K1/28—Making machine elements wheels; discs
- B21K1/32—Making machine elements wheels; discs discs, e.g. disc wheels
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention provides a closed forging process for a flange plate of a hub unit, which comprises the following steps: 1. reversely pushing the size of each station from the size of the final product; 2. the diameter of the upper end of the forward extrusion station is smaller than that of the upper end of the preforming station, and the diameter of the upper end of the preforming station is smaller than that of the upper end of the forming station; 3. designing a die drawing according to the determined size; 4. manufacturing a mould according to a mould drawing; and 5, sequentially carrying out upsetting, forward extrusion, preforming, forming and punching on the bar stock by using a punching die for pressure processing, and finishing the manufacture of the final product. The invention has the advantages that the material distribution is optimized in the plastic forming process of the blank through multi-station forming, the flowing direction of the material streamline is controllable, and the problem that the product is cut off due to streamline offset after being formed is solved.
Description
Technical Field
The invention relates to the field of metal hot forming, in particular to a closed forging process for a flange plate of a hub unit.
Background
The key parts of the hub bearing are important component parts in an automobile chassis, and the flange plate of the hub bearing belongs to the important class of the key parts of the hub bearing. Although a multi-station closed hot die forging process is used in the production of the hub bearing flange plate at present, the product shape is designed according to the original mode in the process step, so that the streamline state of the product is obviously deviated from the cutting surface and is different from the streamline of the traditional open die forging product. The problem of poor streamline of the product can cause the streamline to be cut off after the product is machined, so that the mechanical property of the product is greatly reduced. Therefore, how to reasonably design the product shape in each step to optimize the product streamline is an urgent problem to be solved in the product development process.
At present, a hub bearing flange plate forming process is produced by utilizing a closed multi-station hot die forging process (single multi-station equipment forming), the problems of waste of product materials and low dimensional precision are solved, however, the problem of optimization of product streamline is not realized due to the fact that the product shape of each step is designed according to the shape of the traditional forging process, and the product streamline is still cut off after machining.
Therefore, there is a need to provide a new solution.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention discloses a closed forging process for a flange plate of a hub unit, which has the following specific technical scheme:
the invention provides a closed forging process for a flange plate of a hub unit, which comprises the following steps:
(1) reversely designing the shape and size of products at each station from the size of a final target product, and sequentially recurrently obtaining the shape and size of the products at forming, preforming, forward extruding and upsetting stations, wherein the diameter and size of a front station recurrently in the reverse direction are smaller than those of a rear station;
(2) according to the design of the shape and the size of the products of the pre-forming station and the forward extrusion station, on the basis of following the step 1, the outer diameter of the upper end of the product of the pre-forming station is smaller than that of the upper end of the product of the forming station, and the outer diameter of the upper end of the product of the forward extrusion station is smaller than that of the upper end of the product of the pre-forming station;
(3) designing a die drawing according to the shape and the size of each station designed in the steps (1) and (2), wherein a nitrogen spring device is used during the design of the die drawing to realize the centering and pilot effect of a preformed product before forming;
(4) when the die part is manufactured according to the die drawing in the step (3), the die part is executed according to the requirement that the diameter of the outer diameter of the upper die is smaller than that of the inner cavity of the lower die, so that the guiding effect of the die of each station is realized, and the coaxiality precision improvement requirement of products of each station can be ensured;
(5) and during production, the heated bar stock is sequentially subjected to pressure processing through upsetting, forward extrusion, preforming, forming and punching dies, and the manufacture of a final product is finished.
Further, the diameter size of the front station which is reversely recurred in the step (1) is 0.5 mm/single side smaller than that of the rear station.
Further, the diameter of the upper end of the product at the pre-forming station in the step (2) is 1mm smaller than that of the product at the forming station, and the diameter of the upper end of the product at the forward extrusion station is 1mm smaller than that of the product at the pre-forming station.
Further, the diameter of the upper die in the step (4) is 0.15mm smaller than that of the lower die in terms of single side.
Further, still the design has the supplementary centering structure of mould to use with nitrogen gas spring assembly is supporting: before forming, the auxiliary centering structure of the die extends out of the upper die cavity of the forming die to be at the lowest point under the action of a nitrogen spring piston rod, so that the auxiliary centering structure surface of the die can be firstly contacted with a workpiece to finish auxiliary centering, and in the forming process, the nitrogen spring extends into the cylinder body under the action of load; after the forming is completed, the load force is released and applied to the mold auxiliary centering structure, so that the mold auxiliary centering structure returns to the lowest point position.
Furthermore, the mould auxiliary centering structure conducts a loading force through the connecting rod and the nitrogen spring piston rod to realize relative movement.
The invention has the following beneficial effects:
1. according to the closed forging process for the flange plate of the hub unit, disclosed by the invention, the material distribution is optimized in the plastic forming process of the blank through multi-station forming, so that the flow direction of a material streamline is controllable, and the problem that the product is cut off due to streamline offset after being formed is solved.
2. According to the closed forging process for the flange plate of the hub unit, the outer diameter of the upper end of a preformed product is smaller than that of the formed upper end, and the outer diameter of the upper end of a forward extruded product is smaller than that of the preformed upper end, so that the effect of restraining the transverse flow of a workpiece head material in the forming process is realized, and the streamline shape of the flange plate surface is optimized.
3. According to the closed forging process for the flange plate of the hub unit, the diameter of the outer shape of the upper forming die is 0.15 mm/single side smaller than that of the inner cavity of the corresponding lower forming die, so that the shape and structure in the forming process meet the requirements of auxiliary centering action and material flow restraining action before the product is formed.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow line before closed forging process optimization of a hub unit flange plate according to the present invention.
FIG. 2 shows the flow lines of the hub unit flange closed forging process of the present invention after optimization.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention provides a closed forging process for a flange plate of a hub unit, which comprises the following steps:
(1) reversely designing the shape and size of products at each station from the size of a final target product, and sequentially recurrently obtaining the shape and size of the products at forming, preforming, forward extruding and upsetting stations, wherein the diameter and size of a front station recurrently in the reverse direction are smaller than those of a rear station;
(2) according to the design of the shape and the size of the products of the pre-forming station and the forward extrusion station, on the basis of following the step 1, the outer diameter of the upper end of the product of the pre-forming station is smaller than that of the upper end of the product of the forming station, and the outer diameter of the upper end of the product of the forward extrusion station is smaller than that of the upper end of the product of the pre-forming station;
(3) designing a die drawing according to the shape and the size of each station designed in the steps (1) and (2), wherein a nitrogen spring device is used during the design of the die drawing to realize the centering and pilot effect of a preformed product before forming;
(4) when the die part is manufactured according to the die drawing in the step (3), the die part is executed according to the requirement that the diameter of the outer diameter of the upper die is smaller than that of the inner cavity of the lower die, so that the guiding effect of the die of each station is realized, and the coaxiality precision improvement requirement of products of each station can be ensured;
(5) and during production, the heated bar stock is sequentially subjected to pressure processing through upsetting, forward extrusion, preforming, forming and punching dies, and the manufacture of a final product is finished.
The diameter size of the front station reversely recurred in the step (1) is 0.5mm smaller/single side than that of the rear station.
And (3) in the step (2), the diameter of the outer shape of the upper end of the product at the pre-forming station is 1mm smaller than that of the outer shape of the upper end of the product at the forming station, and the diameter of the outer shape of the upper end of the product at the forward extrusion station is 1mm smaller than that of the outer shape of the upper end of the product at the pre-.
And (4) the diameter of the upper die outline is 0.15mm smaller than that of the lower die inner cavity per single side.
Still design in step (3) and have the supplementary centering structure of mould and use with nitrogen gas spring assembly is supporting: before forming, the auxiliary centering structure of the die extends out of the upper die cavity of the forming die to be at the lowest point under the action of a nitrogen spring piston rod, so that the auxiliary centering structure surface of the die can be firstly contacted with a workpiece to finish auxiliary centering, and in the forming process, the nitrogen spring extends into the cylinder body under the action of load; after the forming is completed, the load force is released and applied to the mold auxiliary centering structure, so that the mold auxiliary centering structure returns to the lowest point position.
The mould auxiliary centering structure realizes relative movement by transmitting a load force through the connecting rod and the nitrogen spring piston rod.
Referring to fig. 1 and 2, the streamlines before and after optimization are respectively, and the streamlines after optimization are more uniform.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by one skilled in the art.
While embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications and variations may be made therein by those of ordinary skill in the art within the scope of the present invention.
Claims (6)
1. A closed forging process for a flange plate of a hub unit is characterized by comprising the following steps:
(1) reversely designing the shape and size of products at each station from the size of a final target product, and sequentially recurrently obtaining the shape and size of the products at forming, preforming, forward extruding and upsetting stations, wherein the diameter and size of a front station recurrently in the reverse direction are smaller than those of a rear station;
(2) according to the design of the shape and the size of the products of the pre-forming station and the forward extrusion station, on the basis of following the step 1, the outer diameter of the upper end of the product of the pre-forming station is smaller than that of the upper end of the product of the forming station, and the outer diameter of the upper end of the product of the forward extrusion station is smaller than that of the upper end of the product of the pre-forming station;
(3) designing a die drawing according to the shape and the size of each station designed in the steps (1) and (2), wherein a nitrogen spring device is used during the design of the die drawing to realize the centering and pilot effect of a preformed product before forming;
(4) when the die part is manufactured according to the die drawing in the step (3), the die part is executed according to the requirement that the diameter of the outer diameter of the upper die is smaller than that of the inner cavity of the lower die, so that the guiding effect of the die of each station is realized, and the coaxiality precision improvement requirement of products of each station can be ensured;
(5) and during production, the heated bar stock is sequentially subjected to pressure processing through upsetting, forward extrusion, preforming, forming and punching dies, and the manufacture of a final product is finished.
2. The closed forging process for the flange plate of the hub unit according to claim 1, wherein the diameter size of the front station which is reversely recurred in the step (1) is 0.5 mm/single side smaller than that of the rear station.
3. The closed forging process for the flange plate of the hub unit according to claim 1, wherein in the step (2), the outer diameter of the upper end of the product of the pre-forming station is 1mm smaller than that of the upper end of the product of the forming station, and the outer diameter of the upper end of the product of the forward extrusion station is 1mm smaller than that of the upper end of the product of the pre-forming station.
4. The closed forging process for the flange plate of the hub unit according to claim 1, wherein the diameter of the outline of the upper die in the step (4) is 0.15mm smaller than that of the inner cavity of the lower die per single side.
5. The closed forging process for the flange plate of the hub unit according to claim 1, wherein a die auxiliary centering structure is further designed in the step (3) to be used with a nitrogen spring device: before forming, the auxiliary centering structure of the die extends out of the upper die cavity of the forming die to be at the lowest point under the action of a nitrogen spring piston rod, so that the auxiliary centering structure surface of the die can be firstly contacted with a workpiece to finish auxiliary centering, and in the forming process, the nitrogen spring extends into the cylinder body under the action of load; after the forming is completed, the load force is released and applied to the mold auxiliary centering structure, so that the mold auxiliary centering structure returns to the lowest point position.
6. The closed forging process for the flange plate of the hub unit according to claim 5, wherein the die auxiliary centering structure is used for realizing relative movement by transmitting a loading force through the connecting rod and the nitrogen spring piston rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011592625.3A CN112496220A (en) | 2020-12-29 | 2020-12-29 | Closed forging process for flange plate of hub unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011592625.3A CN112496220A (en) | 2020-12-29 | 2020-12-29 | Closed forging process for flange plate of hub unit |
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| Publication Number | Publication Date |
|---|---|
| CN112496220A true CN112496220A (en) | 2021-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011592625.3A Pending CN112496220A (en) | 2020-12-29 | 2020-12-29 | Closed forging process for flange plate of hub unit |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108311621A (en) * | 2018-02-28 | 2018-07-24 | 江苏森威精锻有限公司 | A kind of forging technology of Wheel hub unit flange |
| CN109746362A (en) * | 2019-03-20 | 2019-05-14 | 江苏森威精锻有限公司 | Hub bearing ring flange Multi-station precision forming technology and its realization device |
| CN109926532A (en) * | 2019-03-20 | 2019-06-25 | 江苏森威精锻有限公司 | Hub bearing outer ring Multi-station precision forming technology and its realization device |
-
2020
- 2020-12-29 CN CN202011592625.3A patent/CN112496220A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108311621A (en) * | 2018-02-28 | 2018-07-24 | 江苏森威精锻有限公司 | A kind of forging technology of Wheel hub unit flange |
| CN109746362A (en) * | 2019-03-20 | 2019-05-14 | 江苏森威精锻有限公司 | Hub bearing ring flange Multi-station precision forming technology and its realization device |
| CN109926532A (en) * | 2019-03-20 | 2019-06-25 | 江苏森威精锻有限公司 | Hub bearing outer ring Multi-station precision forming technology and its realization device |
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Application publication date: 20210316 |
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