JP4655732B2 - Molded part manufacturing method, molded part manufacturing apparatus, and molded part - Google Patents

Description

  The present invention relates to a press molding technique for parts such as a carrier of a planetary gear mechanism in which legs are refracted on a sheet metal material. More specifically, the outer R dimension of the base of the legs is a desired dimension. More particularly, the present invention relates to a technique for setting to a minimum outer R dimension.

Conventionally, a technique for manufacturing parts such as a carrier of a planetary gear mechanism in which a leg portion is refracted on a sheet metal material by press molding is well known, and there is a document disclosing this technique (for example, , See Patent Document 1).
Patent Document 1 relates to a technique in which a leg portion (flange portion) is bent substantially upright at the end portion of a sheet metal material, and the tip end portion of the flange portion is locally thickened in the plate thickness direction. In the conventional upsetting method, that is, the method in which the tip of the flange portion is compressed in the sheet metal material direction and the tip is thickened in the plate thickness direction, so-called folding defects occur. We are proposing a technology that can increase the amount of increase in wall thickness without it.

In the press molding of the leg portion, as shown in FIG. 10, when the sheet metal material 52 is pushed into the die 51 by the punch 53, the leg portion 54 is refracted. At this time, the outer side of the root portion 54n of the leg portion 54 is formed in an R shape.
JP 7-155888 A

In the conventional press molding method shown in FIG. 10, the leg portion 54 is refracted at a substantially right angle to the sheet metal material 52, and the outer R dimension 55 of the root portion 54n is the sheet metal material before being refracted. 52 and the thickness t of the leg portion 54 are determined. For this reason, the outer R dimension 55 is set in association with the wall thickness t, and the outer R dimension 55 cannot be set to a desired value unrelated to the wall thickness t.
Regarding the setting of the outer R dimension 55, the outer R dimension 55 is desired by applying a load to the upper end surface 54 g of the leg portion 54 and bringing the material of the leg portion 54 toward the root portion 54 n by the above-described upsetting method. (In this case, it is possible to minimize the outer R dimension 55), but in this case, there arises a problem that the folding defect occurs.
On the other hand, by making it possible to set the outer R dimension 55 to a desired value, the design freedom of the root portion 54n can be expanded, and an increase in the design flexibility is required.

  Therefore, the present invention relates to press molding of a leg portion of a sheet metal material, and proposes a novel technique that enables the outer R dimension of the base portion of the leg portion to be set to a desired value.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, as described in claim 1, by pressing the portion of the main body of the sheet metal material provided with a plurality of tongue-shaped leg portions on the plate-shaped main body with a punch into the main body insertion hole of the die, A method of manufacturing a molded part in which a leg is refracted, wherein the die has a leg receiving groove that receives the leg between the die and the outer peripheral surface of the punch when the leg is refracted. The depth of the leg receiving groove is set to be substantially the same as the thickness of the leg, and the circumferential length of the leg receiving groove becomes narrower as it becomes deeper in the press-fitting direction of the punch. As the sheet metal material is pressed into the die by the punch, both side surfaces of the leg are compressed, and the material of the leg is brought to the base of the leg. Is.

According to a second aspect of the present invention, a portion of the main body of a sheet metal material provided with a punch and a die into which the punch is inserted, and having a plurality of tongue-like leg portions on a plate-shaped main body, the die An apparatus for manufacturing a molded part, in which the leg is refractively molded by press-fitting into the body insertion hole of the body, and the die has an outer peripheral surface of the punch at the time of refracting the leg. Between the leg portions, and the depth of the leg portion receiving groove is set to be substantially the same as the thickness of the leg portion. The circumferential length is set to become narrower as it becomes deeper in the press-fitting direction of the punch, and with the progress of press-fitting of the sheet metal material into the die by the punch, both side surfaces of the leg are compressed, not with the material of the legs asked to root portion of the leg portion .

  According to a third aspect of the present invention, in the leg receiving groove, a range of a predetermined depth from the upper surface of the die has a first groove side surface that forms a predetermined gradient in a side view, and The range deeper than the depth has a second groove side surface that is substantially linear in a side view, and the leg receiving groove has a substantially “Y” shape in a side view by the first and second groove side surfaces. It is assumed that it is configured.

In the first aspect of the present invention, as the press-fitting of the punch proceeds, the material is brought to the root portion of the leg portion, and the minimization of the outer R dimension of the root portion can be advanced. . In this way, a material shift occurs at the base of the component, and the outer R dimension can be set to a desired value (minimization).

  In the second and third aspects of the invention, as the press-fitting of the punch proceeds, the material is brought to the base of the leg, and the outside R dimension of the base is minimized. Can do. In this way, a material shift occurs at the base of the component, and the outer R dimension can be set to a desired value (minimization).

Embodiments of the present invention will be described with reference to the drawings.
The present invention relates to a method for manufacturing a molded part in which a leg portion is refractively formed on a sheet metal material. In the following embodiments, an example of manufacturing a carrier of a planetary gear mechanism will be described.

As shown in FIG. 1, a sheet metal material 1 a provided with a plurality of tongue-shaped leg portions 3, 3, 3 on a disk-shaped carrier body 2 is prepared, and the portion of the carrier body 2 of the sheet metal material 1 a is The punch 10 is press-fitted into the body insertion hole 11 of the die 10. The punch 20 is operated by an actuator such as a hydraulic device (not shown).
As shown in FIG. 2, when the punch 20 is press-fitted, the legs 3, 3 and 3 are bent approximately 90 degrees to form the carrier 1. Further, grooves 3a, 3a, and 3a are formed inside the leg portions 3, 3, and 3, respectively.

  And in this example, as shown in FIGS. 3 to 5, before the refraction molding of the leg part 3, on the surface 1m (back surface) opposite to the refraction direction of the leg part 3 of the sheet metal material 1a, A bulging portion 3m that bulges from the surface 1m in a direction opposite to the refraction direction of the leg portion 3 is provided at a position that becomes the base portion 3n of the leg portion 3 after refraction molding of the leg portion 3. The shape of the bulging portion 3m is set in accordance with the outer R dimension required for the bulging portion 3m after the refraction molding of the leg portion 3.

That is, by forming the bulging portion 3m at a position that becomes the root portion 3n of the leg portion 3 before the refraction molding of the leg portion 3, the bulging portion 3m is formed after the refraction molding of the leg portion 3. , The outermost dimension of the bulging portion 3m of the leg portion 3 after refraction molding is determined by the shape of the bulging portion 3m of the leg portion 3 before refraction molding. 31 is set.
In this case, the outer R dimension 32 of the base portion 3n other than the bulging part 3m is configured to be larger than the outer R dimension 31.

  Further, as described above, the shape of the bulged portion 3m before refraction molding of the leg portion 3 (shape before deformation) is the same as the shape of the bulged portion 3m after refraction molding of the leg portion 3 (shape after deformation). For example, if it is desired to set the outer R dimension 31 to a smaller value, the bulging height H (see FIG. 4) of the bulging portion 3m is set higher. You can do it.

  Further, as shown in FIG. 5, if the vertical surface 3f is formed in the shape of the bulging portion 3m (the shape after deformation) after the refraction molding of the leg portion 3, the vertical surface 3f can stabilize other members. It can also be used as an installation surface when fixed. Further, a configuration may be adopted in which a drill hole 3h is processed in the lateral direction from the vertical surface 3f, a part of the other member is fed into the drill hole 3h, and the other member is fixed. In addition, since the vertical surface 3f is also formed when the drill hole 3h is processed, it is possible to easily and accurately perform the hole processing with a general drilling device.

  3 to 5, the bulging portions 3m, 3m, and 3m are provided at positions corresponding to the grooves 3a, 3a, and 3a provided in the leg portions 3, 3, and 3, respectively. -After the refraction molding of 3, the root portion 3n · 3n · 3n is provided with a portion (minimum R portion) composed of the outer R dimension 31, the shape of the bulging portion 3m · 3m · 3m, The arrangement is not limited to this example. For example, by providing the annular bulging portion 3e, it is possible to configure the minimum R portion constituted by the outer R dimension 31 in the entire range of the root portion 3n.

  Further, as shown in FIG. 4, the bulging portion 3m described above is formed in advance on the sheet metal material 1a before the leg portion 3 is bent. The bulging portion 3m is formed by, for example, applying a load in the plate thickness direction to the upper surface 1d of the sheet metal material 1a to bring the material in the direction opposite to the refraction direction of the leg portion 3 (downward), It can be formed by a so-called crushing process that bulges from the lower surface 1m (back surface) of the sheet metal material 1a.

  As described above, the present embodiment is a method of manufacturing a molded part in which a leg portion is refractively formed on a sheet metal material, and the leg on the surface 1m opposite to the refraction direction of the leg portion 3 of the sheet metal material 1a. A first bulging portion 3m that bulges from the surface 1m in a direction opposite to the refraction direction of the leg portion 3 is formed at a position that becomes the root portion 3n of the leg portion 3 after the refraction molding of the portion 3. The manufacturing method includes a process and a second process in which the leg portion 3 is refractively formed after the bulging portion 3m is formed.

  According to this manufacturing method, the outer R dimension 31 of the bulging portion 3m after the refraction molding of the leg portion 3 can be set by the shape of the bulging portion 3m before the refraction molding of the leg portion 3. The outer R dimension 31 of the root portion 3n (the bulging portion 3m) can be set to a desired value regardless of the wall thickness t (see FIG. 4) of the leg portion 3. Further, as described above, in the present embodiment, the minimum R portion having the outer R dimension 31 can be formed. Moreover, since the minimum R portion can be formed without using the upsetting method, there is no problem of occurrence of a folding defect.

In this embodiment, as shown in FIGS. 1 and 6 to 9, this embodiment is a sheet metal in which a plurality of tongue-shaped legs 3, 3, 3 are provided on a disk-shaped body (carrier body 2). The leg portion 3 is refractively formed on the sheet metal material 1a by press-fitting the body portion of the material 1a into the body insertion hole 11 of the die 10 with a punch 20 to refract the leg portion 3. In the method of manufacturing a part to be manufactured, the dies 10 are legs that respectively accommodate the legs 3, 3, and 3 with the outer peripheral surface 20A of the punch 20 when the legs 3 are bent. Part receiving grooves 12, 12, 12 are provided, and the depth D of the leg receiving grooves 12, 12, 12 is set to be substantially the same as the thickness t of the legs 3, 3, 3, As the circumferential length W (circumferential width) of the leg receiving grooves 12, 12, 12 becomes deeper in the press-fitting direction of the punch 20, It is configured to be set in Kunar so.
The sheet metal material 1 a is press-fitted into the body insertion hole 11 of the die 10 by the punch 20 while the leg portions 3, 3, 3 are received in the leg receiving grooves 12, 12, 12. As the press-in of the punch 20 progresses, the material is brought closer to the base 3n of the legs 3, 3 and 3, and the minimization of the outer R dimension 41 (see FIG. 9) proceeds. .
As described above, in this embodiment, the shape of the leg receiving groove 12 causes a material shift in the root portion 3n, thereby minimizing the outer R dimension 41.

  As shown in FIG. 6, the range of the predetermined depth E from the upper surface 10a of the die 10 for the leg receiving groove 12 has first groove side surfaces 12a and 12a that form a predetermined gradient C in a side view. The range deeper than the predetermined depth E has second groove side faces 12b and 12b that are substantially linear in a side view, and the leg receiving groove 12 has the first and second groove side faces 12a. -By 12b, it is comprised by the substantially "Y" shape in the side view. Further, the range of the leg receiving grooves 12 in which the first groove side surfaces 12a and 12a are configured is the inner side surface 12A, and the range of the leg storing grooves 12 in which the second groove side surfaces 12b and 12b are configured. An inner surface 12B is configured.

  Further, as shown in FIGS. 6 and 7, the circumferential length W (the circumference between the first groove side surfaces 12a and 12a facing each other) of the upper end portion of the inner peripheral surface 12A (the portion opened to the upper surface 10a of the die 10). The length) is set to be substantially the same as the circumference of the leg 3 before refraction molding. The circumferential length 3W of the inner circumferential surface 12B (the circumferential length between the second groove side surfaces 12b and 12b facing each other) is set to be substantially the same as the circumferential length of the leg portion 3 after refraction molding. .

In the above configuration, as shown in FIG. 8, when the sheet metal material 1 a is press-fitted into the die 10 while the sheet metal material 1 a is sandwiched between the punch 20 and the presser-side punch 21, It is sandwiched between the first groove side surfaces 12a and 12a of the leg receiving groove 12, and is advanced into the die 10 while being compressed. By compression of both side surfaces of the leg portion 3 by the first groove side surfaces 12a and 12a, the material of the leg portion 3 is brought close to the root portion 3n of the leg portion 3, and the presser side punch 21, the root portion 3n, and the inner side surface The material is swelled into the space 40 constituted by 12A. That is, since there is no escape space for the material, the compressed material escapes into the space 40, and the deviation of the material proceeds.
Then, as the material advances into the space 40 in this way, the outer R dimension 41 is minimized as shown in FIG. In addition, the outer side R dimension 42 in a figure shows the shape of the root part 3n when not providing the gradient C in said 1st groove | channel side surface 12a * 12a.

  Further, in the above configuration, the circumferential length W · 3W, the predetermined depth D, and the predetermined gradient C are appropriately set according to the shape of the leg portion 3 after refraction molding, By setting the gradient C large, it is possible to generate a large amount of material misalignment (can increase the amount of deformation), and to increase the swelling of the material into the space 40. Further miniaturization of the outer R dimension 41 can be achieved.

  Further, a minimum gap is ensured between the outer peripheral surface 20A of the punch 20 and the inner peripheral surface 11A of the main body insertion hole 11 of the die 10, and the punch 20 slides in the main body insertion hole 11. The material is made to move so that the material of the leg 3 does not escape into the gap during the refraction molding of the leg 3. Further, by preventing the escape of the material to the gap between the punch 20 and the die 10 in this way, the leg portion 3 can be deformed only in the leg portion receiving groove 12, The escape of the material can proceed into the space 40. And according to this, the outside R dimension 41 can be minimized.

  Moreover, according to the manufacturing apparatus provided with the punch 20 configured as described above and the die 10 into which the punch 20 is inserted, a component having a minimum outer R dimension can be manufactured.

The figure shown about the structure of the punch and die which perform refractive shaping | molding of a leg part. The figure shown about the structure of the molded component shape | molded in Example 1. FIG. The figure shown about the structure of the back surface of the sheet metal raw material of Example 1. FIG. The figure shown about the refraction molding of a leg part and formation of the minimum R part in the AA line cross section of FIG. The figure shown about the structure of the base part of the leg part in Example 1. FIG. The figure shown about the shape of the leg part accommodation groove | channel of the die | dye in Example 2. FIG. The figure shown about the refractive shaping | molding of the leg part in Example 2. FIG. The figure shown about the process of the refractive shaping | molding of the leg part in Example 2. FIG. The figure shown about the structure of the base part of the leg part in Example 2. FIG. The figure shown about the refraction molding of the conventional leg part.

1a Sheet metal material 3 Leg 3m bulge 3n Root 31 Outside R dimension

Claims (3)

A part of a sheet metal material provided with a plurality of tongue-like leg portions on a plate-like main body is press-fitted into the body insertion hole of the die with a punch, thereby refraction-molding the leg portion. A manufacturing method comprising:
The die is provided with leg receiving grooves for receiving the leg portions between the outer peripheral surface of the punch and the outer peripheral surface of the punch during refraction molding of the leg portions,
The depth of the leg receiving groove is set to be substantially the same as the thickness of the leg,
The circumferential length of the leg portion receiving groove is set to become narrower as it becomes deeper in the press-fitting direction of the punch,
With the progress of press-fitting of the sheet metal material into the die by the punch, both side surfaces of the leg portion are compressed, and the material of the leg portion is brought close to the base portion of the leg portion.
Manufacturing method of molded parts. A punch and a die into which the punch is inserted;
Molding, wherein the leg portion is refractively molded by press-fitting the portion of the sheet metal material provided with a plurality of tongue-like leg portions on the plate-like body into the body insertion hole of the die with the punch. A device for manufacturing parts,
The die is provided with leg receiving grooves for receiving the leg portions between the outer peripheral surface of the punch and the outer peripheral surface of the punch during refraction molding of the leg portions,
The depth of the leg receiving groove is set to be substantially the same as the thickness of the leg,
The circumferential length of the leg portion receiving groove is set to become narrower as it becomes deeper in the press-fitting direction of the punch ,
With the progress of press-fitting of the sheet metal material into the die by the punch, both side surfaces of the leg portion are compressed, and the material of the leg portion is brought close to the base portion of the leg portion.
Molded part manufacturing equipment. In the leg receiving groove,
The range of the predetermined depth from the upper surface of the die is
Having a first groove side surface forming a predetermined gradient in a side view;
The range deeper than the predetermined depth is
A second groove side surface that is substantially linear in a side view;
The said leg part accommodation groove | channel is comprised by the said 1st and 2nd groove | channel side surface by the substantially "Y" shape in the side view, The manufacturing apparatus of the molded component of Claim 2 characterized by the above-mentioned. .

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