KR101668379B1 - Parking gear having invonlute spline for transmission forging method and apparatus - Google Patents
Parking gear having invonlute spline for transmission forging method and apparatus Download PDFInfo
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- KR101668379B1 KR101668379B1 KR1020150163307A KR20150163307A KR101668379B1 KR 101668379 B1 KR101668379 B1 KR 101668379B1 KR 1020150163307 A KR1020150163307 A KR 1020150163307A KR 20150163307 A KR20150163307 A KR 20150163307A KR 101668379 B1 KR101668379 B1 KR 101668379B1
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- mold
- spline
- preform
- involute spline
- molded product
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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
- 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
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/02—Special design or construction
- B21J9/022—Special design or construction multi-stage forging presses
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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
Abstract
The present invention relates to a method of forging a parking gear for a transmission having an involute spline, and more particularly to a method of forging a parking gear for a transmission having an involute spline, in which a plurality of first involute splines spaced apart along the outer circumferential surface are formed by a hot forging process The preform is molded and the preform is pressed by a cold forging process to form a final molded product of a parking gear in which a more elaborate second involute spline is formed along the outer circumferential surface to form an involute spline value without tooth cutting, To a method of forging a parking gear for a transmission having an involute spline in which precision of dimensions is improved by forming a final molded product by a cold forging process and preventing the lowering of the strength of the spline teeth.
Description
The present invention relates to a method of forging a parking gear for a transmission having an involute spline, and more particularly to a method of forging a parking gear for a transmission having an involute spline, in which a plurality of first involute splines spaced apart along the outer circumferential surface are formed by a hot forging process The preform is molded and the preform is pressed by a cold forging process to form a final molded product of a parking gear in which a more elaborate second involute spline is formed along the outer circumferential surface to form an involute spline value without tooth cutting, To a method of forging a parking gear for a transmission having an involute spline in which precision of dimensions is improved by forming a final molded product by a cold forging process and preventing the lowering of the strength of the spline teeth.
The transmission is a device that reciprocates between a parking mode in which the vehicle is parked, a reverse mode, and a neutral mode and an auto driving mode. Generally, in an automotive transmission, in a parking structure for parking, when the driver places the conversion lever in the parking mode position, the lever on the transmission side is moved to fix the
The
The present invention relates to a method of manufacturing a parking gear, and more particularly, to a method of manufacturing a parking gear, in which a preliminary assembly gear, which is a preliminary gear of the assembly gear at the time of performing a warm forging process, The present invention relates to a method of manufacturing a parking gear in which tooth surfaces of corner portions and parking gear teeth facing the parking gear teeth are smooth and tooth surface shapes and dimensions of the corner portions and the parking gear teeth of each parking gear tooth are uniform.
However, since the above-mentioned patent passes through a warm-forging step after one warm forging process, the above-mentioned flow of the metal material is cut off, and the problem of the lowering of the tooth strength and the problem of the precision of the tooth are inevitable.
Therefore, it is possible to maintain the tooth strength without preforming the final forming by cutting the flow of the metal material, and forming the involute spline by other processes than the turning process. Thus, the transmission for the transmission having the involute spline There is a need to provide a gear forging method and apparatus therefor.
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems,
There is provided a method of forging a parking gear for a transmission having an involute spline for producing a parking gear having an improved accuracy of a second involute spline formed on the outer circumferential surface by forming a final formed product by a cold forging process, It has its purpose.
The present invention also relates to a method for forming a preformed product by a hot forging process and forming a final formed product by a cold forging process to prevent a decrease in the strength of the second involute spline due to a change in physical properties due to flow- And an object of the present invention is to provide a method of forging a parking gear for a transmission having an involute spline capable of preventing an increase in maintenance cost and thus an increase in maintenance cost.
The present invention also relates to a method for forming a preformed article by a hot forging process and molding a final formed article by a cold forging process, thereby preventing an increase in consumption time due to tooth cutting, And an object thereof is to provide a parking gear forging method for a transmission having an involute spline and an apparatus therefor.
The present invention also provides a method for forging a parking gear for a transmission having an involute spline having a further improved precision by further finely machining a first involute spline formed on an outer circumferential surface of a preform by a cold forging process with a second involute spline And an object thereof is to provide such a device.
Further, the present invention is characterized in that the groove forming portion protruding surface defining the second involute spline groove forming portion by the upper second spline groove forming portion and the lower second spline groove forming portion is formed, and the upper second spline groove forming portion When the molded part is worn out, the third lower mold is released from the body part and then inserted again to fix the lower groove forming part to the upper side by changing the upper and lower parts to relatively increase the service life of the third lower mold, And an object of the present invention is to provide a parking gear forging method for a transmission having an involute spline capable of preventing an overvoltage.
The present invention is also directed to a method of manufacturing a molded product, comprising the steps of: after completion of final molding by pressurization of a third upper mold through a first lower knockout having a cylindrical through-hole formed in a hollow portion of the lower through- And an involute spline capable of easily taking out the molded article from the third lower mold by being lifted up, and an object thereof is to provide a method for forging a parking gear for a transmission.
Further, according to the present invention, a spring device positioned below the first lower knockout supports the lower knockout, a space is formed between the third upper and lower molds and the third preform, the volume of the molded product moves toward the space, And an object of the present invention is to provide a method of forging a parking gear for a transmission having an involute spline for preventing the breakage of the mold.
The present invention also provides a parking gear forging method for a transmission having an involute spline for securing a spring device by a fixing portion formed at one side of a bottom surface of a first lower knockout to prevent lateral movement of the spring device, And the like.
In order to achieve the above object, the present invention is implemented by the following embodiments.
According to one embodiment of the present invention, a parking gear forging method for a transmission having involunt splines according to the present invention includes positioning a third preform having a first involute spline along an outer circumferential surface thereof on a first lower knockout surface of a body portion The third upper mold is lowered toward the third lower mold fixed to the upper side of the body portion so that the fourth pressing surface of the first upper punch presses and lowers the third preliminarily molded article to form the through holes of the third lower mold, And a final forming step of forming a final involute spline having a second involute spline spaced apart from the circumferential surface by a second involute spline forming part spaced at regular intervals in the circumferential direction and spaced apart at regular intervals along the outer circumferential surface, And a cold forging process capable of increasing the accuracy of the tooth profile of the first involute spline The.
According to another embodiment of the present invention, there is provided a method for forging a parking gear for a transmission having an involute spline according to the present invention, wherein in the final molding step, a spring device is located in the lower fixed portion of the lower knockout, A space is formed between the three preliminarily molded products to move the volume of the third preliminarily molded product toward the space to prevent twisting phenomenon and thus damage of the mold.
According to another embodiment of the present invention, a method of forging a parking gear for a transmission having involunt splines according to the present invention is characterized in that the final forming step is a step in which the spring device pushes up the first lower knockout Accordingly, the first lower knockout pushes up the final molded product, so that the operator can easily take out the molded product from the third lower mold.
According to another embodiment of the present invention, in the method for forging a parking gear for a transmission having involunt splines according to the present invention, in the final molding step, the third upper mold is lowered and inserted into the hollow portions of the lower through- The first guide portion is inserted into the upper through-hole of the first upper punch so as to guide the downward movement of the third base metal mold.
According to another embodiment of the present invention, in the parking gear forging method for a transmission having involunt splines according to the present invention, in the cold forging process, when the upper second spline groove forming portion is worn by the repeated final process, Further comprising a mold resetting step of interrupting the operation of the third lower mold, separating the lower mold from the body part, and changing the vertical direction so that the lower second spline groove forming part is fixed to the upper side of the body part, Can be relatively extended to prevent the cost increase and waste of resources.
According to another embodiment of the present invention, a parking gear forging method for a transmission having involunt splines according to the present invention is characterized in that the parking gear forging method includes a step of positioning a first preform between a second upper mold and a second lower mold The second upper mold is lowered to form a first involute spline which is spaced apart at regular intervals along one side of the second preform by the second upper pressing surface and the first involute spline forming portion, A second preliminary step of forming a second preliminarily molded product by the third recessed part and the third recessed part, and a third preliminary step of cutting the third protruded surface of the second preliminarily molded product to form a third preliminary molded product, A hot forging step including a third preliminary step of forming a molded article is further carried out so that the metal flow of the molded article can be maintained while increasing the tooth strength And that is characterized.
According to an embodiment of the present invention, a parking gear forging apparatus for a transmission having an involute spline according to the present invention comprises a cylindrical third upper body, a shaft having a reduced diameter at a bottom surface of the third upper body, And a third upper mold including a first upper punch having a through hole having a predetermined diameter on its bottom surface, a third lower body having a cylindrical shape, an outer peripheral surface of a lower through-hole formed on an upper surface of the third lower body, And a third lower mold including a second involute spline forming part having a projection shape spaced apart at regular intervals along a circumferential direction of the final molded product to form a second involute spline along an outer circumferential surface of the final molded product, .
According to another embodiment of the present invention, in the parking gear forging apparatus for a transmission having an involute spline according to the present invention, the second spline forming portion is formed by machining a first involute spline value of the preliminary molded product to form a more elaborate second spline tooth A second spline forming portion formed in a shape complementary to the second involute spline along the circumferential direction of the outer circumferential surface of the lower through hole; a second spline forming portion projecting outward along the circumferential direction of the outer circumferential surface of the lower through- And a second spline groove forming part formed in a shape complementary to the second involute spline groove so as to form a second spline groove between the involute spline teeth.
According to another embodiment of the present invention, in the parking gear forging apparatus for a transmission having involunt splines according to the present invention, the second spline forming portion is protruded outward from one side of the second spline groove forming portion, And a groove forming part protruding surface for defining the groove forming part as an upper groove forming part and a lower groove forming part. When the second spline groove forming part is worn, the third lower mold is separated from the body part, So that the third lower mold can be continuously used.
According to another embodiment of the present invention, the parking gear forging apparatus for a transmission having an involute spline according to the present invention further comprises a body portion for inserting and fixing the third lower mold on the upper side thereof, A first lower knockout for allowing the operator to easily take out the molded article from the third lower mold by pushing up the molded article after the final molded article is molded in a cylindrical shape having a through hole having a predetermined diameter; A space is formed between the third upper and lower molds and the preliminarily molded article by supporting the first lower knockout, and the volume of the molded article is moved toward the space to prevent twisting phenomenon and damage to the mold And a spring device roll.
According to another embodiment of the present invention, there is provided a parking gear forging apparatus for a transmission having an involute spline, wherein the first lower knockout includes a ring-shaped outer fixed ring having a predetermined height at one side of the bottom surface, And a ring-shaped inner fixed stationary ring having a predetermined height to fix the spring device in the space between the rings, thereby limiting lateral movement of the spring device.
According to still another embodiment of the present invention, there is provided a parking gear forging apparatus for a transmission having an involute spline, wherein the body is located in the hollow portion of the lower through-hole and the body portion, And a first guide portion inserted into the upper through-hole to guide the lowering of the first upper punch accurately.
According to another embodiment of the present invention, a parking gear forging apparatus for a transmission having involunt splines according to the present invention is characterized in that the parking gear forging apparatus comprises a cylindrical second upper body and a lower body formed on the lower surface of the second upper body A second lower mold having a cylindrical lower body and a second lower portion formed by being inserted into the upper surface of the second lower body and pressing the preliminarily molded article by hot forging molding, a second upper mold including an upper pressing surface for pressing the preliminarily molded article, And a second involute spline for forming a first involute spline having a predetermined shape on one side of the preform as the second upper mold is lowered to press the preform, And a hot forging mold including a forming part is additionally provided so that the preliminarily molded product is heated by hot forging before forging by the cold forging mold By type it is characterized in that to increase the strength values obtained by molding while keeping the metal flow of the molded article.
The present invention can obtain the following effects according to the above-described embodiment, the constitution described below, the combination and use relationship.
The present invention has the effect of producing a parking gear in which the precision of the second involute spline formed on the outer peripheral surface is improved by molding the final molded product by the cold forging process.
The present invention also relates to a method for forming a preformed product by a hot forging process and forming a final formed product by a cold forging process to prevent a decrease in the strength of the second involute spline due to a change in physical properties due to flow- And an increase in maintenance cost can be prevented.
The present invention also relates to a method for forming a preformed article by a hot forging process and molding a final formed article by a cold forging process, thereby preventing an increase in consumption time due to tooth cutting, It is effective.
Further, according to the present invention, the first involute spline formed on the outer circumferential surface of the preliminarily molded article by the cold forging process is further finely processed by the second involute spline, so that the accuracy of the precision can be further improved.
Further, the present invention is characterized in that the groove forming portion protruding surface defining the second involute spline groove forming portion by the upper second spline groove forming portion and the lower second spline groove forming portion is formed, and the upper second spline groove forming portion When the molded part is worn out, the third lower mold is released from the body part, and the lower groove forming part is inserted again to be fixed on the upper side by changing the upper and lower parts to relatively increase the service life of the third lower mold, Can be prevented.
The present invention is also directed to a method of manufacturing a molded product, comprising the steps of: after completion of final molding by pressurization of a third upper mold through a first lower knockout having a cylindrical through-hole formed in a hollow portion of the lower through- So that the worker can easily take out the molded article from the third lower mold.
Further, according to the present invention, a spring device positioned below the first lower knockout supports the lower knockout, a space is formed between the third upper and lower molds and the third preform, the volume of the molded product moves toward the space, There is an effect that it is possible to prevent the breakage of the mold caused thereby.
Further, the present invention has the effect of preventing lateral movement of the spring device by fixing the spring device by the fixing part formed at one side of the bottom surface of the first lower knockout.
1 is an exploded perspective view of a first mold used in a first preliminary process according to an embodiment of the present invention;
2 is a cross-sectional view showing a state before molding of the first upper mold and the first lower mold according to the present invention
3 is a cross-sectional view showing a state in which the first preformed article of the first upper mold and the first lower mold according to the present invention is hot forged;
4 is a cross-sectional view showing a state after molding of the first upper mold and the first lower mold according to the present invention
Fig. 5 is a perspective view of the first pre-
6 is an exploded perspective view of a second mold used in a second preliminary process according to an embodiment of the present invention.
7 is a cross-sectional view showing a state before molding of the second upper mold and the second lower mold according to the present invention
8 is a cross-sectional view showing a state in which the first preformed article of the second upper mold and the second lower mold according to the present invention is hot forged;
9 is a cross-sectional view showing a state after molding of the second upper mold and the second lower mold according to the present invention
10 is a perspective view of a second preform
11 is a perspective view of the third preliminarily molded article
12 is an exploded perspective view of a third mold used in the final molding process according to an embodiment of the present invention.
13 is a cross-sectional view showing the state before molding of the third upper mold and the third lower mold according to the present invention
14 is a cross-sectional view showing a state in which a final molded product of a third upper mold and a third lower mold according to the present invention is subjected to cold forging molding
15 is a cross-sectional view showing a state after molding of the third upper mold and the third lower mold according to the present invention
16 is an enlarged view of a second involute spline forming portion of a third lower mold according to the present invention
17 is a perspective view of a final molded product
18 is a comparative reference diagram of Involute splines of the third preform and the final molded article
19 is a block diagram of a parking gear forging method for a transmission having an involute spline according to an embodiment of the present invention
Fig. 20 is a block diagram of a hot forging process according to Fig. 19
Fig. 21 is a block diagram of a cold forging process according to Fig. 19
Hereinafter, a method for forging a parking gear for a transmission having an involute spline according to the present invention and its apparatus will be described in detail with reference to the accompanying drawings. It is to be noted that the same elements among the drawings are denoted by the same reference numerals whenever possible. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Unless defined otherwise, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs and, if conflict with the meaning of the terms used herein, It follows the definition used in the specification.
FIG. 1 is an exploded perspective view of a first mold used in a first preliminary process according to an embodiment of the present invention, FIG. 2 is a sectional view showing a state before molding of a first upper mold and a first lower mold according to the present invention And FIG. 3 is a cross-sectional view illustrating a state in which the first preform of the first upper mold and the first lower mold according to the present invention is hot forged, FIG. 4 is a cross-sectional view of the first upper mold and the first lower mold according to the present invention, 5 is a perspective view of the first preform, FIG. 6 is an exploded perspective view of a second mold used in a second preliminary process according to an embodiment of the present invention, and FIG. 7 is a cross- 8 is a view illustrating a state where a first preform of a second upper mold and a second lower mold according to the present invention is hot forged; FIG. 8 is a view showing a state in which a first preform of a second upper mold and a second lower mold according to the present invention are hot forged; Sectional view, and Fig. 9 FIG. 10 is a perspective view of the second preform, FIG. 11 is a perspective view of the third preform, and FIG. 12 is a perspective view of the second preform according to the present invention. 13 is an exploded perspective view of a third mold used in a final forming process according to an embodiment, FIG. 13 is a sectional view showing a state before molding of a third upper mold and a third lower mold according to the present invention, and FIG. 14 is a cross- FIG. 15 is a cross-sectional view showing a state after molding of the third upper mold and the third lower mold according to the present invention, and FIG. 15 is a cross-sectional view showing a state after molding of the third upper mold and the third lower mold according to the present invention. 16 is an enlarged view of the second involute spline forming portion of the third lower mold according to the present invention, FIG. 17 is a perspective view of the final molded product, and FIG. 18 is a cross sectional view of the involute spline of the third preform and the final molded product A bridge note.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, preferred embodiments of a hot forging apparatus and a cold forging apparatus used in respective steps of a parking gear forging method for a transmission having involunt splines according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. It is obvious that the parking gear according to the present invention can be used not only for an automatic transmission but also for a manual transmission.
1 to 4, in a parking gear forging apparatus for a transmission having involunt splines according to an embodiment of the present invention, in a hot forging step (S1) of a parking gear forging method for a transmission having involute splines The hot forging die used in the first preliminary process S11 includes a
The first
The first
The first upper pressing
The first
The first
The first
The
The first recessed
The second recessed
Referring to FIG. 5, the
6 to 9, in a parking gear forging apparatus for a transmission having involunt splines according to an embodiment of the present invention, in a method for forging a parking gear for a transmission having involute splines, a hot forging step (S1) The hot forging die used in the second preliminary process S13 includes the
The second
The second
The second
The first
The second
The third
The second
The second
The second
The first
The second
The third
The second
The second
The second
The
The first
The first involute
The first involute spline
The third
The fourth recessed
Referring to FIG. 10, the
11, in the parking gear forging apparatus for a transmission having involunt splines according to an embodiment of the present invention, in the third preliminary step (S15) in the hot forging step (S1), the second preliminary molded
As described above, in order to perform the cold forging of the
12 to 16, in the parking gear forging apparatus for a transmission having involunt splines according to an embodiment of the present invention, the cold forging mold used in the cold forging step S2 is formed of a
The third
The third
The first
The fourth
The first upper through
The third
The third
The lower through-
The second involute
The second involute
The second involute spline
The groove forming
The
The
The first
The fixing
The
Referring to FIG. 17, in the parking gear forging apparatus for a transmission having involunt splines according to an embodiment of the present invention, a final molded
After the final molded
19 is a block diagram of a method for forging a parking gear for a transmission having an involute spline according to an embodiment of the present invention, Fig. 20 is a block diagram of a hot forging process according to Fig. 19, Fig. 21 is a cross- Fig.
Hereinafter, with reference to Figs. 19 to 21, a method for forging the
In the first preliminary process S11, the
In the second preliminary process (S13), the first preliminarily molded product (11) is positioned between the second upper mold (31) and the second lower mold (33). The second
In the third preliminary process S15, the first
The cold forging step (S2) includes a final forming step (S21) and a mold resetting step (S23), the details of which will be described below.
The
When the upper second spline
As described above, in order to perform the cold forging of the
The high-frequency heat treatment step S3 is a step of subjecting the final molded
The broaching step S4 is a step of forming a
The method for forging a
While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Should be interpreted as falling within the scope of.
1: Parking gear
11: First preform
111: first protruding surface
12: Second preform
121: first outer surface 122: first involute spline
122a: first
123: second protruding surface 124: third protruding surface
13: Third preform
131:
14: Finished product
141: 2nd involute spline
141a: second
142:
15: Finished product
151: hole 152:
2: first mold
21: first upper mold
211: first upper body 213: first upper pressing surface
23: a first lower mold
231: first lower body 233: first lower seating surface
233a:
3: second mold
31: second upper mold
311: second upper body 313: second upper pressing surface
313a: first pressing
33: second lower mold
331: second lower body 333: second lower seating surface
333a:
333b-1: First involute spline value forming section
333b-2: First involute spline groove forming part
333c:
4: Third mold
41: third upper mold
411: third upper body 413: first upper punch
413a: fourth pressing
43: third lower mold
431: third lower body 433: lower through hole
435: second involute spline forming part
435a: second involute spline tooth forming section
435b: second involute spline groove forming part
435b-1: upper second involute spline groove forming part
435b-2: Lower second involute spline groove forming part
435c: projecting surface of the groove forming part
45:
451: first guide portion
453: First lower knockout
453a:
453a-1: outer fixed
455: Spring device
S1: Hot forging process
S11: First preliminary process S13: Second preliminary process S15: Third preliminary process
S2: Cold forging process
S21: final forming step S23: mold resetting step
S3: High-frequency heat treatment process
S4: Broaching process
Claims (13)
When the upper second spline groove forming part is worn out by the repeated final molding step, the operation of the final molding step is stopped, the lower mold is separated from the body part, and the lower second spline groove forming part is rotated in the vertical direction, And a mold re-setting step of re-inserting the mold so as to be fixed on the upper side. The forging gear for forgings according to any one of the preceding claims,
In the final molding step, a spring device is positioned in the lower fixed portion of the first lower knockout, and a space is formed between the third upper and lower molds and the third preform to move the volume of the third preform toward the space, Thereby preventing the occurrence of breakage of the mold and the occurrence of breakage of the mold.
The final molding process is such that the spring device pushes up the first lower knockout after the final molded article has been molded so that the lower knock pushes up the finished molded article so that the operator can easily remove the molded article from the third lower mold Wherein the method comprises the steps of:
The third forming step includes a first lowering step of lowering the third upper mold and a first guide part inserted into the hollow part of the lower through-hole and the body part into the first upper through-hole of the first upper punch, Wherein the guiding member is guided by the spline.
The method of forging the parking gear according to the present invention is characterized in that after the first preliminarily molded article is positioned between the second upper mold and the second lower mold, the second upper mold is lowered, and the second upper pressurizing surface and the first involute spline- 1 molding a first involute spline spaced apart at regular intervals along one side of a preform and forming a second preform having a ring-shaped second protruding surface on one side by the second pressing surface and the third recess, A second preliminary process for carrying out the preliminary process,
And a third preliminary step of cutting a third projecting surface of the second preliminarily molded product to form a third preliminarily molded product having a penetrating portion formed at the center thereof, wherein the third preliminary step further comprises a hot forging step involving the involute spline A method for forging a parking gear.
And a second involute spline forming part having a protruding shape spaced apart at regular intervals along the circumferential direction of the outer circumferential surface of the lower through-hole formed on the upper surface of the third lower body, Including a mold,
The second spline forming portion is formed in a shape complementary to the second involute spline along the circumferential direction of the outer circumferential surface of the lower through hole to form a more elaborate second spline tooth by machining the first involute spline of the third pre- The second involute spline groove is formed to protrude outward along the circumferential direction of the outer circumferential surface of the lower through hole and to be spaced apart at regular intervals to form a second spline groove between the involute spline teeth. A second spline groove forming part protruding outward from one side of the second spline groove forming part and defining the second spline groove forming part as an upper groove forming part and a lower groove forming part, When the second spline groove forming part including the protruding surface is worn, the third After separation of the mold from the upper and lower body portion to change the transmission parking gear forging apparatus having an involute spline, characterized in that that the re-inserted into the body portion continues to be the third lower die.
The third mold further includes a body for inserting and fixing the third lower mold on the upper side,
A first lower knockout for allowing a worker to easily take out a molded product from a third lower mold by pushing up the final molded product after the final molded product is molded in a cylindrical shape having a through hole having a predetermined diameter,
A space is formed between the third upper and lower molds and the third preform to support the lower knockout, and the volume of the third preform is moved toward the space, thereby generating a twist phenomenon, And a spring device for preventing breakage of the mold caused by the impact spline.
And a second involute spline forming unit having a cylindrical third lower body and a protrusion shape spaced apart from the outer circumferential surface of the lower through-hole formed on the upper surface of the third lower body at regular intervals along the circumferential direction, A third lower mold for forming a second involute spline along the outer peripheral surface,
And a body portion for inserting and fixing the third lower mold on an upper side thereof,
A first lower knockout for allowing the operator to easily take out the final molded product from the third lower mold by pushing up the final molded product after the final molded product is molded in a cylindrical shape having a through hole having a predetermined diameter; A space is formed between the third upper and lower molds and the third preform to support the lower knockout, and the volume of the third preform is moved toward the space to generate a twist phenomenon, And a spring device for preventing breakage of the spring,
The first lower knockout includes a ring-shaped outer fixed ring having a predetermined height on one side of the bottom surface and a ring-shaped inner fixed ring having a predetermined height on the other side to fix the spring device in the space between the rings Wherein the spring device is capable of restricting lateral movement of the spring device.
Wherein the body portion further includes a first guide portion that is positioned in the hollow portion of the lower through hole and the body portion and is inserted into the upper through hole as the upper punch descends to guide the lowering of the upper punch accurately. Fork gear for a transmission.
The parking gear forging apparatus includes a cylindrical second upper body, a second upper mold formed on a bottom surface of the second upper body and including an upper pressing surface for pressing the preform,
And a second lower seating surface formed on the upper surface of the second lower body for hot forging by pressing the preliminarily molded article,
Wherein the second lower seating surface comprises a first involute spline forming unit for forming a first involute spline having a predetermined shape on one side of the pre-molded product as the second upper mold descends to press the pre- 2 < / RTI > further comprises a mold.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150163307A KR101668379B1 (en) | 2015-11-20 | 2015-11-20 | Parking gear having invonlute spline for transmission forging method and apparatus |
| KR1020160096156A KR102371769B1 (en) | 2015-11-20 | 2016-07-28 | Parking gear having invonlute spline for transmission forging method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150163307A KR101668379B1 (en) | 2015-11-20 | 2015-11-20 | Parking gear having invonlute spline for transmission forging method and apparatus |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020160096156A Division KR102371769B1 (en) | 2015-11-20 | 2016-07-28 | Parking gear having invonlute spline for transmission forging method and apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR101668379B1 true KR101668379B1 (en) | 2016-10-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020150163307A KR101668379B1 (en) | 2015-11-20 | 2015-11-20 | Parking gear having invonlute spline for transmission forging method and apparatus |
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| Country | Link |
|---|---|
| KR (1) | KR101668379B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112404914A (en) * | 2020-10-29 | 2021-02-26 | 四川众友机械有限责任公司 | Forging processing technology of parking gear |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100808647B1 (en) * | 2007-07-03 | 2008-03-03 | 유림산업 주식회사 | Cold forging method and device thereof for automatic transmission shaft plant carrier with involute spline |
| KR100996515B1 (en) * | 2009-03-23 | 2010-11-25 | 임기현 | A Close Type Cold Forging Method and the Device thereof for a Sidegear of Differential Limitation Equipment |
-
2015
- 2015-11-20 KR KR1020150163307A patent/KR101668379B1/en active IP Right Grant
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100808647B1 (en) * | 2007-07-03 | 2008-03-03 | 유림산업 주식회사 | Cold forging method and device thereof for automatic transmission shaft plant carrier with involute spline |
| KR100996515B1 (en) * | 2009-03-23 | 2010-11-25 | 임기현 | A Close Type Cold Forging Method and the Device thereof for a Sidegear of Differential Limitation Equipment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112404914A (en) * | 2020-10-29 | 2021-02-26 | 四川众友机械有限责任公司 | Forging processing technology of parking gear |
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