CN110640074A - Hot forging method and device for composite clutch gear shape part for vehicle - Google Patents
Hot forging method and device for composite clutch gear shape part for vehicle Download PDFInfo
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- CN110640074A CN110640074A CN201810839566.1A CN201810839566A CN110640074A CN 110640074 A CN110640074 A CN 110640074A CN 201810839566 A CN201810839566 A CN 201810839566A CN 110640074 A CN110640074 A CN 110640074A
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- 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
- B21K1/30—Making machine elements wheels; discs with gear-teeth
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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
- B21J5/002—Hybrid process, e.g. forging following casting
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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
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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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- 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
- B21J5/12—Forming profiles on internal or external surfaces
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The present invention relates to a method and an apparatus for hot forging a tooth profile of a composite clutch gear for a vehicle, and more particularly, to a method and an apparatus for hot forging a tooth profile of a composite clutch gear for a vehicle, which can realize the shape of the tooth profile of a molding material more precisely and maintain dimensional accuracy uniformly and stably by a hot coining process without an additional process so as not to affect a production process at all.
Description
Technical Field
The present invention relates to a method and an apparatus for hot forging a tooth profile of a composite clutch gear for a vehicle, and more particularly, to a method and an apparatus for hot forging a tooth profile of a composite clutch gear for a vehicle, which can improve the accuracy of the incomplete dimension and shape of the tooth profile of a clutch gear in a hot forging process and prevent the occurrence of defects in a final formed product by improving the hot forging process.
Background
Generally, the driving force required for the vehicle running varies greatly depending on the running environment.
Therefore, in order to correspond to this, a transmission that changes torque between an engine and drive wheels is mounted on a vehicle.
The transmission is classified into a manual transmission and an automatic transmission, and the manual transmission is provided with a clutch gear having a transmission function as a synchronizing member that engages with a Sleeve (Sleeve) to regulate the power of an engine as needed and to change the speed of a vehicle.
Also, the clutch gear is composed of a main body portion and a tooth-shaped portion which are separately manufactured from each other by cutting or the like and then joined by a joining method such as welding or the like.
That is, as disclosed in korean laid-open patent No. 10-2011-.
In the conventional technology, since it is very difficult to form the tooth profile of the clutch gear, the main body and the tooth profile are separately manufactured and then integrally formed with each other by welding, which causes problems of reduced work efficiency and waste of material cost. Further, when the main body portion and the tooth-shaped portion are joined by welding, there is a problem that the durability of the joined portion is lowered.
As shown in fig. 1 to 3, in recent years, in forging a clutch gear, a composite clutch gear in which a main body portion and a tooth-shaped portion are integrally molded instead of separately forged is intended to ensure a function as a finished product excluding machining by a molding method of a Near-net shape (Near-net shape) in combination of hot forging and cold forging, thereby reducing manufacturing processes and manufacturing costs as compared with a conventional separate clutch gear.
Preliminary tooth forging by hot forging performed before a cold coining (cold sizing) process in a subsequent process has a great influence on the quality of cold forging in the subsequent process, and thus, more accurate shape and dimensional accuracy are required.
However, in the hot forging process, the tooth forming portion of the die for forming the tooth profile portion of the composite clutch gear is worn out early, and an incomplete unformed portion is formed at the lower portion of the tooth flank surface of the tooth profile portion of the composite clutch gear, which causes a problem, and accordingly, it is necessary to replace the die or perform an operation for improving the tooth forming portion of the die, and thus, the time consumed for processing the tooth profile portion is relatively increased, thereby not only increasing the processing cost but also increasing the material loss.
Documents of the prior art
Patent document
Korean laid-open patent publication No. 2011-0058483 (2011.06.01)
Disclosure of Invention
Problems to be solved
Accordingly, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method and an apparatus for hot forging a tooth profile of a composite clutch gear for a vehicle, in which an incomplete unformed portion of the tooth profile of a molded product, which is generated by abrasion of a tooth forming portion of a first lower die of the composite clutch gear through a finish forging process in a hot forging process, can be corrected by a hot coining process of the tooth forming portion of a second lower die when a piercing process for removing forging dust of an inner diameter portion is performed.
Means for solving the problems
In order to achieve the above object, the present invention provides a hot forging method for a tooth profile of a composite clutch gear for a vehicle, which is used for press-forming a tooth profile of a molding material by using a tooth forming portion of a first lower die in a finish forging process in a series of hot forging processes, and which includes a piercing step and a hot coining step. The piercing step is for removing a forging scrap of the inner diameter portion of the center hole of the molding material subjected to the finish forging step; and a hot coining step of pressing the tooth-shaped portion of the molding material with a tooth-shaped portion of a second lower die, so as to grind an unformed portion remaining in the tooth bone surface, which remains in the finish forging step, and finish the precise tooth-shaped portion according to the size, simultaneously with the piercing step.
According to an embodiment of the present invention, in the hot coining step, the molding material is press-molded by the second upper die while the molding material is kept in a raised state, which is raised by an amount corresponding to a height of the unmolded portion, above the second lower die, wherein the unmolded portion remains on a tooth bone surface of the tooth-shaped portion of the molding material.
The present invention provides a hot forging device for a tooth profile portion of a composite clutch gear for a vehicle, including a first hot forging device and a second hot forging device, wherein the first hot forging device uses a first tooth forming portion of a first lower die in a finish forging step in a series of hot forging processes to press-form the tooth profile portion of a molding material, and the second hot forging device includes: a second lower forging die; a second upper die that moves up and down while being arranged to face the second lower die; a center jig supporting a peripheral surface of an inner lower portion of the tooth-shaped portion adjacent to a center portion of the molding material; an outer jig supported on a peripheral surface of an outer lower portion of the tooth portion of the molding material; a second upper die provided to be slidable in a vertical direction by the second upper die, and configured to press an upper portion of the molding material; a second lower die having a second tooth-shaped portion for meshing with the tooth-shaped portion and pressing the tooth-shaped portion so as to grind an unformed portion remaining on the tooth bone surface of the molding material in the finish forging step, thereby completing a precise tooth-shaped portion in accordance with the size; a center punch portion provided at the second upper forging die and adapted to be inserted into an inner diameter portion of a center hole of the molding material to remove a forging dust; and an elastic pin portion elastically supporting the molding material and providing a restoring force to return the molding material to an original position.
According to an embodiment of the present invention, the molding material is press-molded by the second upper die while the second lower die is kept in a raised state in which the molding material is raised by an amount corresponding to a height of the unmolded portion, which remains on a tooth bone surface of the tooth-shaped portion of the molding material.
According to an embodiment of the present invention, the center punch portion and the second upper die are configured to be able to work simultaneously.
According to an embodiment of the present invention, the second tooth forming portion of the second lower die is formed to be smaller in size than the tooth-shaped portion of the molding material.
Effects of the invention
According to the hot forging method and apparatus for the tooth profile of the composite clutch gear for a vehicle of the present invention having the above features, the shape of the tooth profile of the molding material is more precisely realized and the dimensional accuracy can be uniformly and stably maintained by the hot coining process without an additional process in order to completely not affect the production process.
Further, the thermal coining process can be performed simultaneously with the piercing process for removing the inner diameter forging scrap of the incomplete part of the product tooth profile shape due to the wear of the first tooth forming part of the first lower die of the composite clutch gear, so that the tooth profile shape of the molding material can be precisely realized by the second lower die in the thermal coining process even if some premature wear occurs in the first tooth forming part of the first lower die, along with precisely maintaining the shape of the tooth profile of the molding material, and therefore, the life of the first lower die can be increased.
Further, since the hot coining process which can be performed simultaneously is carried out in combination with the piercing process for removing the bore forging dust of the molding material, an additional process is not required, and the entire production process is not affected.
Drawings
Fig. 1 is a perspective view showing a conventional general compound clutch gear.
Fig. 2a and 2b are a plan view and a sectional view showing the composite clutch gear of fig. 1.
Fig. 3 is a front view showing a tooth profile of a conventional general compound clutch gear.
Fig. 4 is a sectional view showing the first hot forging apparatus of the finish forging forming process according to the present invention.
Fig. 5 is a perspective view illustrating a first lower die of the first hot forging apparatus according to the finish forging forming process of the present invention.
Fig. 6a and 6b are a plan view and a sectional view showing the first lower mold of fig. 5.
Fig. 7 is a side view illustrating a tooth profile of a composite clutch gear in a finish forging process according to the present invention.
Fig. 8 is a sectional view showing a second hot forging apparatus of the hot coining process according to the present invention.
Fig. 9 is a perspective view illustrating a second lower die of the second hot forging apparatus according to the hot coining process of the present invention.
Fig. 10a and 10b are a plan view and a sectional view showing the second lower mold of fig. 9.
Description of the reference numerals
100: first hot forging apparatus 110: first upper forging die
120 first lower forging die 130 first upper die
140: first lower mold 200: second hot forging apparatus
210: second upper forging die 220: second lower forging die
230: the outer clamp 240: center clamp
250: second upper mold 260: second lower mold
270: center punch portion 280: elastic pin part
Detailed Description
The present invention may be variously modified and may have various shapes, and embodiments are described in detail herein. However, the present invention is not limited to the specific forms disclosed, and it should be understood that the present invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention. Like reference numerals are used for like features while describing the various figures.
The terms are only used to distinguish one feature element from another. The terminology used in the description presented herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 4 is a sectional view showing the first hot forging apparatus according to the finish forging process of the present invention, fig. 5 is a perspective view showing the first lower die of the first hot forging apparatus according to the finish forging process of the present invention, fig. 6a and 6b are a plan view and a sectional view showing the first lower die of fig. 5, and fig. 7 is a side view showing the tooth profile of the composite clutch gear in the finish forging process according to the present invention.
In the hot forging of the composite clutch gear 10 for a vehicle, the conventional method is adopted in the steps of raw material heating and upsetting, pre-forging (blocker) forming, and finish-forging (finish) forming.
In addition, in the piercing (piercing) step of removing the forging chips s from the inner diameter portion 11 of the composite clutch gear 10, a hot-coining step of forming the fine bone surface 13 along the tooth profile portion 12 is performed by pressing the molding material m forming the linear spline teeth at the same time (see fig. 3).
In the above-described series of hot forging steps, after the molding material m that has completed the upsetting step is preferentially subjected to the preforging, the finish forging step is sequentially performed.
As a means for forming the rough shape of the tooth-shaped portion 12 on the outer peripheral surface of the molding material m in the composite clutch gear 10, the first hot forging apparatus 100 used in the finish forging step is configured to form the rough shape of the tooth-shaped portion 12 on the outer peripheral surface of the molding material m when the finish forging step is performed on the molding material m by the first hot forging apparatus 100 having the shape shown in fig. 4.
As shown, in the first hot forging apparatus 100, the first upper die 110 and the first lower die 120 are disposed at positions spaced apart by a predetermined interval up and down, and such first upper die 110 and first lower die 120 are generally elastically supported by an elastic stay (not shown).
The molding material m having completed the preforging step is pressurized at a vertical position by providing a first upper die 130 in the first upper die 110 and a first lower die 140 in the first lower die 120. At this time, the molding material m placed on the first lower mold 140 is placed in an upside-down state of upside down.
As shown in the drawing, the first lower die 140 is provided with a molding material m having completed a preliminary forging step. A first tooth forming portion 141 for forming the rough tooth portion 12 on the outer peripheral surface of the molding material m is provided at the center of the first lower die 140.
Therefore, the first upper die 110 moves downward while the first upper die 130 and the first lower die 140 are spaced apart from each other by a predetermined distance in the vertical direction. In this process, the substantially tooth-shaped portion 12 is formed on the outer peripheral surface of the lower end of the molding material m by the first tooth forming portion 141 formed on the first lower die 140.
When the finish forging step is performed, the first upper die 130 is lowered toward the first tooth forming portion 141 formed in the first lower die 140 and the molding material m is repeatedly pressurized, so that tooth forming is performed on the outer peripheral surface of the molding material m, and the tooth portion 12 is formed.
After the finish forging process is performed by the hot forging process, the first tooth forming portion 141 of the first lower die 140 completes the shape of the tooth profile 12 having the straight spline teeth shown in fig. 3 on the outer peripheral surface of the molding material m shown in fig. 1 to 2 b.
In the finish forging step, when a pressing force is applied to the molding material m while the first upper die 130 is lowered, the first tooth forming portion 141 formed in the first lower die 140 is deformed by wear due to the repeated pressing force of the molding material m. That is, as shown in fig. 5, when the tooth forming surface 141a of the upper portion of the first tooth forming portion 141 of the first lower mold 140 exceeds the replacement life and reaches the wear limit during the repeated forming of the first lower mold 140 (see the enlarged view), an incomplete unmolded portion 12a is generated below the tooth bone surface 13 of the tooth-shaped portion 12 of the molding material m (see fig. 7).
In the finish forging step of hot forging, the molding material m cannot be precisely machined to a desired size due to wear of the first tooth molding portion 141 provided in the first lower die 140, and defects occur. In addition to solving the defects of the tooth profile 12 of the molding material m caused by the above, and improving the work of replacing a die or improving the tooth profile, which results in loss of processing time, processing cost, and the like, in the present invention, a hot coining process is separately performed after the finish forging forming process, the hot coining process is performed by pressurizing the molding material m forming the linear spline teeth, and the precise tooth bone surface 13 is formed according to the size of the tooth profile 12.
In addition, as shown in fig. 6b, an exhaust hole 142 that allows air in the space between the first lower mold 140 and the molding material m to be exhausted to the outside is formed at the first lower mold 140.
The air vent 142 is formed to allow air to flow between the space between the first lower mold 140 and the molding material m and the outside. The vent 142 may be fabricated using a variety of methods. That is, a method such as drilling (drilling) of a die may be used, but the vent hole 142 may be formed on the first lower die 140 by a wire cut (wire cut) manner in the present invention. Preferably, the vent hole 142 formed by the wire cutting method may minimize the size thereof and may reduce the manufacturing cost of the entire mold. Preferably, the exhaust hole 142 is formed with a diameter as small as possible when air can flow.
Fig. 8 is a sectional view showing the second hot forging apparatus according to the hot coining process of the present invention, fig. 9 is a perspective view showing a second lower die of the second hot forging apparatus according to the hot coining process of the present invention, and fig. 10a and 10b are a plan view and a sectional view showing the second lower die of fig. 9.
In the present invention, a rough tooth profile 12 is formed on the outer peripheral surface of a molding material m by using the first hot forging apparatus, and then a second hot forging apparatus 200 is provided on the tooth profile 12 of the molding material m through a hot coining process that can be performed simultaneously with the piercing process, the second hot forging apparatus 200 performing a precise tooth profile process on the tooth profile 12 in accordance with a desired dimension.
The second tooth forming portion 263 of the second lower mold 260 has a lower wear than the first tooth forming portion 141 of the first lower mold 140, so that the second tooth forming portion 263 has an advantage of longer service life even when the first tooth forming portion 141 exceeds the wear limit and reaches the replacement life.
Fig. 8 shows a cross-sectional view of features of a second hot forging apparatus according to the hot coining process of the present invention.
As shown in the drawing, the second hot forging apparatus 200 includes a second upper die 210, a second lower die 220, an outer clamp 230, a center clamp 240, a second upper die 250, a second lower die 260, a center punch (punch) 270, and a spring pin 280.
The second lower die 220 is fixedly provided below the second upper die 210 so as to face the second lower die. Therefore, when the second upper die 210 is lowered, the second lower die 220 supports the molding material m. Said outer gripper 230 and said center gripper 240 are disposed above such said second lower die 220.
Wherein the outer clamps 230 and the center clamp 240 are provided to support the molding materials m, respectively, in a radial shape from a center line. That is, the center jig 240 is supported on the peripheral surface of the inner lower portion of the tooth portion 12 adjacent to the center portion of the molding material m, and the outer jig 230 is supported on the peripheral surface of the outer lower portion of the tooth portion 12 of the molding material m. The center line shows a virtual line passing through the geometric center of the molding material m.
The outer side jig 230 and the center jig 240 stably support the molding material m so that the molding material m can be disposed above the second lower die 220, and thus, when the center punch 270 descends, the molding material m may be inserted into the center hole h of the molding material m, thereby removing the slug (slug).
To explain in more detail, the forging dust s may be removed as the center punch portion 270 descends in a state where the molding material m is seated on the outer jig 230 and the center jig 240 on the second lower die 220.
As shown in the drawing, a second lower mold 260 is provided between the outer jig 230 and the center jig 240, and a second tooth forming portion 263 is provided in the second lower mold 260, and the second tooth forming portion 263 is used to precisely form an unmolded portion 12a remaining under the tooth surface 13 of the tooth-shaped portion 12 of the molding material m in a state where the molding material m is engaged with the tooth-shaped portion 12. At this time, the molding material m seated on the second lower mold 260 is seated in an upside-down state with the upper and lower sides turned upside down.
As shown in fig. 9, the second lower mold 260 includes: a flange portion 261 formed with a pin insertion hole 261a for supporting the pin insertion hole of the outer clamp 230 by inserting the elastic pin portion 280 therethrough; and a tooth forming ring portion 262 along a peripheral surface of an inner side above the flange portion 261 and formed with a second tooth forming portion 263.
The tooth portion 12 of the molding material m is engaged with the second tooth molding portion 263 of the second lower mold 260 in the vertical direction and is slidably disposed. At this time, an incomplete unmolded portion 12a remains in the tooth-shaped portion 12 of the molding material m at the lower portion of the tooth bone surface 13, and the molding material m is in a stopped state while being kept in an elevated state by an amount corresponding to the height of the unmolded portion 12a, as shown in the portion 'a' of fig. 8, in the tooth-shaped portion 12 of the molding material m that is engaged with the second tooth-shaped portion 263 of the second lower die 260. That is, before the piercing step and the hot coining step, the molding material m is kept raised above the second lower mold 260 by a certain distance (height of the unmolded portion 12 a).
The second upper die 210 is vertically moved while being disposed upward so as to face the second lower die 220, and can remove the chips s of the inner diameter portion 11 of the molding material m disposed on the second lower die 220. That is, a driving means (not shown) such as a cylinder or an actuator is provided at the upper portion of the second upper die 210 to move the second upper die 210 in the vertical direction. The second upper forging die 210 is provided with a center punch 270 so as to move down in accordance with the operation of the driving means, and removes the forging chips s of the inner diameter portion 11 of the molding material m.
When the second upper forging die 210 is lowered in a state where the center punch 270 is disposed in the second upper forging die 210, the center punch 270 is lowered accordingly while removing the forging chips s generated from the inner diameter portion 11 of the through hole of the tooth forming ring 262 disposed on the molding material m.
To describe in more detail, when the center punch 270 moves in response to the lowering of the second upper die 210, the molding material m held in a raised state above the second tooth molding portion 263 of the second lower die 260 is lowered with a space therebetween when the second upper die 250 is pressed in contact with the upper portion of the molding material m in accordance with the movement of the center punch 270. The unformed part 12a, which is generated by forming the tooth-shaped part 12 of the molding material m that has not been completely formed by the worn part of the first tooth forming part 141 of the first lower die 140 in the finish forging step as a preceding step, can be molded more accurately and precisely by the hot coining process. That is, the molding material m is pressed by the second tooth molding portion 263 of the second lower mold 260, and the unmolded portion 12a remaining on the tooth flank 13 due to the compressive stress is ground while being depressed, thereby forming the precise tooth-shaped portion 12.
At the same time, the center punch 270 may remove the forging chips s generated at the inner diameter portion 11 of the through hole of the molding material m.
As such, the center punch 270 is provided at the second upper die 210 in correspondence with the center jig 240, so that when the second upper die 210 descends, the molding material m is pressurized while being moved accordingly, and the forging scrap s of the inner diameter portion 11 of the molding material m can be removed.
Wherein the center punch portion 270 is provided to be slidable in the up-down direction together with the second upper die 250 by the second upper die 210. Here, since the lower end of the center punch 270 is maintained in contact with the forging chips s of the inner diameter portion 11 and the lower end of the second upper die 250 is maintained in contact with the upper surface of the molding material m, the forging chips s of the inner diameter portion 11 are removed and the tooth profile 12 of the molding material m can be corrected while the second upper die 210 is lowered.
The elastic pin portion 280 elastically supports the outer clamp 230 supporting the molding material m in a state of being inserted into the pin insertion hole 261a of the flange portion 261 of the second lower mold 260. That is, the elastic pin 280 continuously supports the molding material m even in the hot coining process of controlling the shape of the precise tooth portion 12 of the molding material m while removing the forging chips s generated in the inner diameter portion 11 of the through hole of the molding material m by the lowering of the second upper forging die 210.
After the outer jig 230 elastically supports the molding material m, and the piercing process and the hot coining process are performed by the lowering of the second upper die 210, when the second upper die 210 is raised again, the outer jig 230 is raised by an amount corresponding to the restoring force of the elastic pin portion 280, and the molding material m is also returned to the original position.
Preferably, in the present invention, the first tooth forming portion 141 and the second tooth forming portion 263 of the first lower mold 140 and the second lower mold 260 are formed to be smaller than the size of the tooth-shaped portion 12 of the molded article m, so that the first tooth forming portion 141 and the second tooth forming portion 263 enter the tooth-shaped portion 12 at an early stage.
As shown below, the hot coining operation of the composite clutch gear tooth form portion 12 for a vehicle according to the embodiment of the invention is described below.
First, the molding material m is placed and arranged on the second lower die 220 of the second hot forging apparatus 200. That is, the outer supporting surface of the molding material m is supported by the outer clamp 230 while the inner supporting surface of the molding material m is supported by the center clamp 240.
Thereafter, the second upper die 210 is lowered and moved while the center punch 270 is in contact with the upper surface of the molding material m above the forging chips s of the inner diameter portion 11 of the molding material m, and the second upper die 250 is in contact with the upper surface of the molding material m. At this time, the molding material m is kept in a state of being raised above the second lower die 260 by an amount corresponding to the height of the unmolded portion 12a, which is left as an unmolded portion 12a due to the wear of the first tooth forming portion 141 of the first lower die 140 in the finish forging step. Among them, the second tooth forming portion 263 of the second lower mold 260 employed has a low degree of wear compared to the first tooth forming portion 141 of the first lower mold 140 of the first hot forging apparatus 100.
When the molding material m is pressed by the second upper die 250 and the center punch 270 and is lowered, the center punch 270 removes the forging chips s of the inner diameter portion 11 of the molding material m.
At the same time, the second upper mold 250 applies a pressing force to the molding material m, so that the first tooth forming portion 141 of the second lower mold 260 meshes with the tooth-shaped portion 12 of the molding material m, and the unmolded portion 12a of the tooth flank 13 is precisely formed.
Thereafter, when the second upper die 210 moves upward, the outer clamp 230 moves upward while supporting the molding material m due to the elastic restoring force of the elastic pin 280, and returns to the original position.
In this way, when the second upper die 250 is pressed by lowering the second upper die 210 for precision forming of the tooth portion 12 while removing the forging s of the inner diameter portion 11 of the molding material m, the outer jig 230 elastically supported by the elastic pin 280 is correspondingly moved downward, and then when the second upper die 210 is raised, the molding material m set in the outer jig 230 is moved to the original position by the elastic restoring force of the elastic pin 280, and thus the accumulation of the forging s of the molding material m and the unformed portion 12a can be prevented.
The molding material m returned to the original position by the elastic restoring force of the elastic pin portion 280 is taken out of the second hot forging apparatus 200 and moved to the heat treatment step of the next step.
The second hot forging apparatus 200 shown in fig. 8 performs the hot coining process for forming the incomplete unformed part 12a of the tooth portion 12 of the molding material m in combination with the piercing process for removing the forging chips s of the inner diameter portion 11 of the molding material m, and thus the hot coining process is not an additional process and is performed simultaneously with the piercing process, and thus does not affect the production process at all.
Therefore, according to the hot forging method of the tooth profile 12 of the composite clutch gear for a vehicle of the present invention, in the hot forging step, the tooth profile 12 of the molding material m that has not been precisely molded in the finish forging step is subjected to a pressing process to complete the final molded product of the composite clutch gear 10 in which the fine tooth bone surface 13 is formed from the tooth profile 12 by removing the forging chips s of the inner diameter portion 11 of the molding material m in the piercing step that is a subsequent step and forming the linear spline teeth.
Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications made by persons having ordinary knowledge in the art to which the present invention pertains without departing from the claims of the present invention should be construed as falling within the scope of the present invention.
Claims (6)
1. A hot forging method for a tooth profile of a composite clutch gear for a vehicle, which is used for press-forming a tooth profile of a molding material by using a tooth forming portion of a first lower die in a finish forging step in a series of hot forging steps, the hot forging method comprising:
a piercing step of removing a forging scrap of the inner diameter portion of the center hole of the molding material subjected to the finish forging step; and
and a hot coining step of pressing the tooth-shaped portion of the molding material with a tooth-shaped portion of a second lower die simultaneously with the piercing step to grind an unformed portion remaining on the tooth bone surface in the finish forging step, thereby finishing a precise tooth-shaped portion in a size.
2. The hot forging method of a tooth profile portion of a composite clutch gear for a vehicle according to claim 1,
in the hot coining step, the molding material is press-molded by the second upper die while the molding material is kept in an elevated state above the second lower die by an amount corresponding to a height of the unmolded portion remaining on a tooth bone surface of the tooth-shaped portion of the molding material.
3. A hot forging device for a tooth profile of a composite clutch gear for a vehicle,
comprises a first hot forging device and a second hot forging device,
the first hot forging apparatus is configured to press-mold the tooth-shaped portion of the molding material by using the first tooth-shaped portion of the first lower die in the finish forging step in a series of hot forging steps,
the second hot forging apparatus includes:
a second lower forging die;
a second upper die that moves up and down while being arranged to face the second lower die;
a center jig supported on a peripheral surface of an inner lower portion of the tooth-shaped portion adjacent to a center portion of the molding material;
an outer jig supported on a peripheral surface of an outer lower portion of the tooth portion of the molding material;
a second upper die provided to be slidable in a vertical direction by the second upper die, and configured to press an upper portion of the molding material;
a second lower die having a second tooth-shaped portion for meshing with the tooth-shaped portion and pressing the tooth-shaped portion so as to grind an unformed portion remaining on the tooth bone surface of the molding material in the finish forging step, thereby completing a precise tooth-shaped portion in accordance with the size;
a center punch portion provided at the second upper forging die and adapted to be inserted into an inner diameter portion of a center hole of the molding material to remove a forging dust; and
and the elastic pin part elastically supports the molding material and provides restoring force to return the molding material to the original position.
4. The hot forging apparatus of a tooth profile portion of a composite clutch gear for a vehicle according to claim 3,
and press-molding the molding material with the second upper mold while maintaining the molding material in an elevated state in which the molding material is elevated by an amount corresponding to a height of the unmolded portion remaining on the tooth bone surface of the tooth-shaped portion of the molding material.
5. The hot forging apparatus of a tooth profile portion of a composite clutch gear for a vehicle according to claim 3,
the central punch portion and the second upper die are configured to be able to work simultaneously.
6. The hot forging apparatus of a tooth profile portion of a composite clutch gear for a vehicle according to claim 3,
the second tooth forming portion of the second lower die is formed to be smaller in size than the tooth-shaped portion of the molding material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020180073471A KR102060751B1 (en) | 2018-06-26 | 2018-06-26 | Hot forging apparatus of complex clutch gear tooth for automobile |
| KR10-2018-0073471 | 2018-06-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110640074A true CN110640074A (en) | 2020-01-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810839566.1A Pending CN110640074A (en) | 2018-06-26 | 2018-07-27 | Hot forging method and device for composite clutch gear shape part for vehicle |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR102060751B1 (en) |
| CN (1) | CN110640074A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111687356B (en) * | 2020-05-24 | 2024-05-24 | 江苏飞船股份有限公司 | Warm forging precision forming die for straight bevel gear |
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|---|---|---|---|---|
| JPS61129252A (en) * | 1984-11-28 | 1986-06-17 | Fuji Heavy Ind Ltd | Phase setting method of body to be worked and metal die in cold plastic work |
| EP0949435A2 (en) * | 1998-04-08 | 1999-10-13 | Mitsubishi Steel MFG. CO., LTD. | Gear with integrated cluch spline and its forming method |
| JP2008105092A (en) * | 2006-10-27 | 2008-05-08 | Musashi Seimitsu Ind Co Ltd | Method for forming forged product |
| KR20170052916A (en) * | 2015-11-05 | 2017-05-15 | 한호산업(주) | Toothed forging device of dogclutch |
| CN106825345A (en) * | 2017-02-16 | 2017-06-13 | 上海汽车变速器有限公司 | The implementation method of the monoblock type combination gear based on enclosed warm forging |
| CN206316303U (en) * | 2016-12-19 | 2017-07-11 | 江苏太平洋齿轮传动有限公司 | The small gear ring radial direction wedge pressure mould of combination gear |
-
2018
- 2018-06-26 KR KR1020180073471A patent/KR102060751B1/en active IP Right Grant
- 2018-07-27 CN CN201810839566.1A patent/CN110640074A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61129252A (en) * | 1984-11-28 | 1986-06-17 | Fuji Heavy Ind Ltd | Phase setting method of body to be worked and metal die in cold plastic work |
| EP0949435A2 (en) * | 1998-04-08 | 1999-10-13 | Mitsubishi Steel MFG. CO., LTD. | Gear with integrated cluch spline and its forming method |
| JP2008105092A (en) * | 2006-10-27 | 2008-05-08 | Musashi Seimitsu Ind Co Ltd | Method for forming forged product |
| KR20170052916A (en) * | 2015-11-05 | 2017-05-15 | 한호산업(주) | Toothed forging device of dogclutch |
| CN206316303U (en) * | 2016-12-19 | 2017-07-11 | 江苏太平洋齿轮传动有限公司 | The small gear ring radial direction wedge pressure mould of combination gear |
| CN106825345A (en) * | 2017-02-16 | 2017-06-13 | 上海汽车变速器有限公司 | The implementation method of the monoblock type combination gear based on enclosed warm forging |
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| Publication number | Publication date |
|---|---|
| KR102060751B1 (en) | 2019-12-30 |
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