JP3562297B2 - Forging die equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a forging die device used in a step of forming a metal part into a predetermined shape by forging.
[0002]
[Prior art]
2. Description of the Related Art Among metal products such as gears used for a power transmission system of an automobile, those manufactured by forging are known. In this type of metal product, a material such as steel is formed into a shape close to a final product by forging, and then unnecessary portions such as an outer peripheral portion and an inner peripheral portion are finished by machining such as cutting.
[0003]
For example, a forged product W for a ring gear shown in FIG. 5 is formed into an annular shape by a forging apparatus 1 as shown in FIG. The forged product W is completed as a gear after the outer peripheral portion, the inner peripheral portion, and the like are cut to a finished contour shape indicated by a two-dot chain line F by machining, and are subjected to processes such as toothing and heat treatment.
[0004]
The forging apparatus 1 shown in FIG. 6 includes, in order from the left, upper and lower mold units 2 and 3 for the first step, upper and lower mold units 4 and 5 for the second step, and upper and lower mold units 6 and 7 for the third step. And upper and lower mold units 8 and 9 for the fourth step. The upper units 2, 4, 6, 8 are provided on a common upper base 10, and the lower units 3, 5, 7, 9 are provided on a lower base 11. By lowering the upper die base 10 along the guide post 12 by a press machine (not shown), the material W1 is interposed between the upper die units 2, 4, 6, 8 and the lower die units 3, 5, 7, 9. It is designed to be pressed. The material W1 is stepwise transferred by the transfer chuck 13 from the mold units 2 and 3 for the first process to the mold units 6 and 7 for the third process via the mold units 4 and 5 for the second process. The forging proceeds, and deburring is performed in the mold units 8 and 9 in the fourth step.
[0005]
In the first step described above, conventionally, the material W1 is pressed by the upper die 15 and the lower die 16 having the concave portions 15a and 16a as shown in FIG. Had been molded. Then, this material W1 is set in the lower mold 21 of the mold apparatus 20 as shown in FIG. 8 in the second step. At the center of the lower mold 21, there is provided a concave portion 25 into which the convex portion ω of the material W1 can be fitted. By fitting the convex portion ω of the material W1 into the concave portion 25, After the positioning of the raw material W1, the upper die 22 is lowered to the bottom dead center of the press as shown in FIG. 9, whereby the forged product W is roughly formed.
[0006]
[Problems to be solved by the invention]
In order to fit the material W1 having the convex portion ω formed by the conventional upper die 15 and lower die 16 for the first process into the concave portion 25 of the lower die 21 for the second process, the material W1 is conveyed by the transfer chuck 13. It is necessary to drop the raw material W1 into the concave portion 25 in a state where the raw material W1 is accurately positioned right above the lower mold 21. For this reason, a high positioning accuracy is required for the transfer chuck 13 and the like.
[0007]
However, due to a limit on the accuracy of the transfer chuck 13, wear of the lower die 21, or the like, the material W1 may get on an eccentric position with respect to the concave portion 25. If the upper die 22 descends and the raw material W1 is pressed in such an eccentric state, the forged product W may be chipped or have an abnormal shape, or a mold trouble may occur.
[0008]
Also, since the conventional upper mold 15 and lower mold 16 are fixed, the mold height cannot be adjusted. For this reason, it is necessary to adjust the height of the transfer chuck 13 every time the setup of the mold is changed, which is a factor that takes time to change the setup. In addition, the conventional upper mold 15 and lower mold 16 need to perform overlaying correction such as welding in order to provide the concave portions 15a and 16a in accordance with the product shape of the material W1. I needed it.
[0009]
Accordingly, it is an object of the present invention to provide a forging die apparatus that can easily form a material into a predetermined shape, facilitate setting of a die, and reduce problems such as die troubles and molding defects. .
[0010]
[Means for Solving the Problems]
The forging die apparatus of the present invention includes a first step die apparatus having an upper die unit and a lower die unit for a first step, and a second die apparatus having an upper die unit and a lower die unit for a second step. A mold device for a process, wherein at least one of the upper mold unit and the lower mold unit for the first process has a mounting base having a screw hole extending along a vertical direction, and a screw screwed into the screw hole. A jack adjustment table having a shaft and a height adjustable with respect to the mounting table, and the jack adjustment table includes an interchangeable upsetting die having a flat molding surface formed on a side in contact with the material. By crushing the cylindrical material flat in the axial direction by the mold device for the first step, so as to form a disk shape of a predetermined outer diameter according to the distance between the mold and the volume of the material, The lower die of the lower die unit for the second step is placed on the upper surface It has a concave portion having a circular inner peripheral surface, and the inner diameter of the concave portion is such that a disc-shaped material having a predetermined outer diameter formed by the mold device for the first step can enter therein. Is characterized in that its outer periphery is in contact with the inner peripheral surface of the recess. In the present invention, the height of the upsetting mold can be variably set by rotating the jack adjustment table provided in the mold unit for the first process around the screw axis. The molding surface of the upsetting die has a flat shape, and the material is crushed into a disk shape by the molding surface when the upper die unit is lowered to the bottom dead center of the press. When the molding surface is worn or damaged, the upsetting die is removed from the jack adjustment table and replaced with a new upsetting die.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
The mold apparatus 30 for the first step shown in FIGS. 1 and 2 includes an upper mold unit 31 and a lower mold unit 32.
[0012]
The upper unit 31 includes an upper mounting base 35 and an upper jack adjustment base 36. A screw hole 40 is formed in the center of the upper mounting base 35 along the vertical direction. On the inner peripheral surface of the screw hole 40, a thread having a predetermined pitch that forms a female screw is formed. The screw hole 40 is open on the lower surface side of the upper mounting base 35. The upper mounting base 35 is provided, for example, in a first process portion (a portion corresponding to the upper die unit 2) of the upper die base 10 as shown in FIG.
[0013]
The upper jack adjustment table 36 includes a disk-shaped main body 41, a flat upsetting die 42 provided on the lower surface side of the main body 41, and a mounting ring 43 for fixing the upsetting die 42 to the main body 41. And a fixing member 44 such as a bolt for fixing the mounting ring 43 to the main body 41, and a screw shaft 45 protruding above the main body 41.
[0014]
The screw shaft 45 extends vertically. On the outer peripheral surface of the screw shaft 45, a screw thread forming a male screw that can be screwed into the screw hole 40 is formed. With the screw shaft 45 screwed into the screw hole 40, the screw shaft 45 is rotated integrally with the main body 41, and the jack adjustment base 36 is moved in the axial direction of the screw shaft 45 (vertical direction) according to the amount of rotation. The height of the upset mold 42 can be adjusted by screwing it up. The screw hole 40 and the screw shaft 45 constitute a height adjusting mechanism 46 according to the present invention. A set screw 47 for fixing the screw shaft 45 to a desired position is provided on a side portion of the mounting base 35.
[0015]
The lower surface of the upsetting die 42, that is, the molding surface 48 facing the material W1 has a flat shape. The upsetting die 42 can be easily removed from the main body 41 by detaching the attachment ring 43 from the main body 41 by loosening the fixing member 44 or the like.
[0016]
On the other hand, the lower die unit 32 includes a lower mounting table 55 and a lower jack adjustment table 56. A screw hole 60 is formed in the center of the lower mounting base 55 along the vertical direction. On the inner peripheral surface of the screw hole 60, a thread having a predetermined pitch that forms a female screw is formed. The screw hole 60 is open on the upper surface side of the mounting table 55. The mounting table 55 is provided in a first process portion (a portion corresponding to the lower die unit 3) of the lower die base 11 shown in FIG.
[0017]
The lower jack adjusting base 56 includes a disk-shaped main body 61, a flat upsetting die 62 provided on the upper surface side of the main body 61, and a mounting ring 63 for fixing the upsetting die 62 to the main body 61. And a fixing member 64 such as a bolt for fixing the mounting ring 63 to the main body 61, and a screw shaft 65 protruding below the main body 61.
[0018]
The screw shaft 65 extends vertically. On the outer peripheral surface of the screw shaft 65, a screw thread forming a male screw that can be screwed into the screw hole 60 is formed. With the screw shaft 65 screwed into the screw hole 60, the screw shaft 65 is rotated integrally with the main body 61, and the jack adjustment base 56 is moved in the axial direction (vertical direction) of the screw shaft 65 according to the amount of rotation. The height adjustment of the upsetting die 62 is made possible by screwing it up. That is, the screw hole 60 and the screw shaft 65 constitute a height adjusting mechanism 66 according to the present invention. A set screw 67 for fixing the screw shaft 65 to a desired position is provided on a side portion of the mounting table 55.
[0019]
The upper surface of the upsetting die 62, that is, the forming surface 68 on which the material W1 rides is parallel and flat with the upper forming surface 48. The upsetting die 62 can be easily removed from the main body 61 by removing the attachment ring 63 from the main body 61 by loosening the fixing member 64 or the like.
[0020]
The mold device 70 for the second step shown in FIGS. 3 and 4 includes an upper mold unit 71 and a lower mold unit 72. The upper die unit 71 includes an upper mount 73, a pressure receiving plate 74, an upper die 75 including an inner die 75a and an outer die 75b, a ring 76 for holding the upper die 75, a knockout pin 77, and the like. The upper mounting base 73 is provided in a second process portion (a portion corresponding to the upper die unit 4) of the upper die base 10 shown in FIG.
[0021]
The lower die unit 72 includes a lower mounting base 80, a pressure receiving plate 81, a lower die 82 including an inner die 82a and an outer die 82b, a knockout pin 83, and the like. On the upper surface (molding surface) side of the lower die 82, a concave portion 84 having a circular inner peripheral surface 84a as viewed from above is formed. The inner diameter d of the concave portion 84 is a dimension that the disk-shaped material W1 having a predetermined outer diameter D can just enter. The lower mounting base 80 is provided in a second process portion (a portion corresponding to the lower die unit 5) of the lower die base 11 shown in FIG.
[0022]
Next, the operation and the like of the mold devices 30 and 70 of the embodiment will be described.
As shown in FIG. 1, the heated columnar material W1 is placed on the upsetting die 62 in a posture in which the axis C is vertically set. Then, as shown in FIG. 2, the upper die unit 31 is lowered to the bottom dead center of the press. By doing so, the material W1 is crushed flat in the axial direction, so that the outer diameter of the material W1 is increased. The material W1 is formed into a disk shape having a desired outer diameter D in accordance with the distance H between the molds and the volume of the material W1 that have been adjusted in advance.
[0023]
In order to adjust the mold height and the inter-mold distance H of the upset dies 42 and 62, the jack adjustment bases 36 and 56 are rotated around the screw shafts 45 and 65 with the set screws 47 and 67 loosened. Good. If the molding surfaces 48, 68 are worn, damaged or deformed, the upset dies 42, 62 are removed from the main bodies 41, 61 and replaced with new ones.
[0024]
The disc-shaped material W1 (shown in FIG. 2) formed in the first step is conveyed to the mold apparatus 70 for the second step shown in FIG. 3 by the transfer chuck 13 (shown in FIG. 6). In the second step, when the upper die unit 71 and the lower die unit 72 are open to each other, the disc-shaped material W1 is put into the concave portion 84 of the lower die 82 by the transfer chuck 13. At this time, when the outer periphery of the material W1 contacts the inner peripheral surface 84a of the concave portion 84, the center position of the material W1 with respect to the lower mold 82 is matched. Since the material W1 is formed into a disk shape so as to have a predetermined outer diameter D in the first step, the outer periphery of the material W1 can reliably contact the inner peripheral surface 84a of the concave portion 84.
[0025]
Therefore, according to these mold apparatuses 30 and 70, the transfer of the material W1 by the transfer chuck 13 is different from the conventional mold center setting method which required severe adjustment, in the first step, on the upsetting mold 62. Since it suffices to simply place the material W1, the center of the material W1 and the center of the upsetting mold 62 may be shifted from each other. Further, in the second step, since the outer diameter D of the raw material W1 matches the inner diameter d of the concave portion 84 simply by dropping the raw material W1 into the concave portion 84 of the lower die 82, the raw die W1 is naturally positioned by the lower die 82. Become. Therefore, the positioning failure in the second step is eliminated, and troubles such as prevention of eccentricity of the material W1 and abnormal stop of the transport mechanism are reduced.
[0026]
After the material W1 is set on the lower mold 82, the upper mold unit 71 descends to the bottom dead center of the press as shown in FIG. 4, thereby closing the upper mold 75 and the lower mold 82, and pressing the material W1. As a result, a forged product W having a shape close to the final product is obtained.
[0027]
In the mold apparatus 30 of the above-described embodiment, the jack adjusters 36 and 56 capable of adjusting the height are provided on both the upper mold unit 31 and the lower mold unit 32, but one of these mold units 31 and 32 is provided. A jack adjustment table may be provided. For example, the jack adjustment table 36 may be provided only in the upper mold unit 31 and the lower mold unit 32 may be a simple flat type.
[0028]
【The invention's effect】
According to the mold apparatus according to the first aspect, a columnar material is desired according to the distance H between the mold and the volume of the material that has been adjusted in advance by the jack adjustment table of the mold apparatus for the first process. Can be formed into a disk shape having an outer diameter of That is , the material is formed into a disk shape by the upsetting die having a flat forming surface. By dropping the disc-shaped material into the recess of the lower mold unit of the lower mold unit for the second step, the outer periphery of the disc-shaped material is in contact with the inner peripheral surface of the recess. This can be easily performed, and positioning failure in the second step can be eliminated.
[0029]
Further, according to the mold apparatus of the present invention, the distance between the upper and lower molds can be adjusted easily and in a short time by the simple height adjusting mechanism, so that the outer diameter of the material after molding becomes a desired value. Thus, the distance between the dies can be finely adjusted. In addition, since the height of the mold can be easily variably set by the height adjusting mechanism, it is not necessary to adjust the height of the transfer chuck at the time of changing the setup, and the setup can be changed quickly.
[0030]
And since the mold apparatus of the present invention uses an upsetting die having a simple shape that can be replaced, when a problem such as wear or surface roughness occurs on the molding surface, the upsetting die can be easily replaced as necessary. can do. This upright mold is easy to manufacture, and can significantly reduce the material cost, processing cost, heat treatment cost, surface treatment cost, and the like required for the mold.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a mold apparatus according to an embodiment of the present invention when the mold is opened.
FIG. 2 is a longitudinal sectional view of the die apparatus shown in FIG. 1 at the time of bottom dead center of press.
FIG. 3 is a vertical cross-sectional view of the mold apparatus for a second step when the mold is opened.
FIG. 4 is a sectional view of the mold apparatus shown in FIG. 3 at the time of bottom dead center of the press.
FIG. 5 is a sectional view showing an example of a forged product.
FIG. 6 is a perspective view schematically showing an outline of a forging apparatus.
FIG. 7 is a longitudinal sectional view showing a part of a conventional first step mold apparatus.
FIG. 8 is a longitudinal sectional view showing a part of a conventional second step mold apparatus.
FIG. 9 is a cross-sectional view of the die apparatus shown in FIG. 8 at the time of the bottom dead center of the press.
[Explanation of symbols]
Reference Signs List 30 forging die apparatus 31 upper die unit 32 lower die unit 35, 55 mounting bases 36, 56 jack adjustment bases 40, 60 screw holes 42, 62 fixed dies 45, 65 screw shaft 46 , 66 ... Height adjustment mechanism

Claims (1)

A mold device for the first step having an upper unit and a lower unit for the first step,
A mold device for the second step having an upper unit and a lower unit for the second step;
Equipped with a forging die device for forging a material,
At least one of the upper mold unit and the lower mold unit for the first step ,
A mounting base having screw holes along the vertical direction,
A jack adjustment table having a screw shaft screwed into the screw hole and having a height adjustable with respect to the mounting table, wherein the jack adjustment table has a flat molding surface formed on a side in contact with the material. By providing a possible upsetting die, the columnar material is flattened in the axial direction by the mold device for the first step, so that a circle having a predetermined outer diameter is formed according to the distance between the molds and the volume of the material. Make it into a plate shape,
The lower die of the lower die unit for the second step has a concave portion having a circular inner peripheral surface when viewed from above on the upper surface, and the inner diameter of the concave portion is formed by the die device for the first step. A forging die apparatus, wherein the disc-shaped material having a predetermined outer diameter can enter therein and the outer periphery of the material is in contact with the inner peripheral surface of the concave portion .

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