JP2017144469A - Manufacturing method of recess processing product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of manufacturing a recess processing product at low cost, by simply and easily forming a recess of straddling an inclined part from a flat part of the recess processing product by half-extraction processing by a press.SOLUTION: When manufacturing a press molding product 28 being a recess processing product by press-processing a product raw material 12 by using a punch 16 having a cross-sectional shape corresponding to an opening shape of a recess 10 and a die 18 having an opening part coincident with the cross-sectional shape of the punch 16 and having a die hole 20 for receiving a material extruded by the punch 16, an inner wall surface 22 of the die hole 20 of the die 18 is formed as a taper surface of inclining at an angle of 5°-15° inward, and an opening edge part of the die hole 20 positioned on the inclined plane 18a-side of the die 18, is also formed as a curved surface 24 having a radius of curvature of 0.3 mm or more.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a method for manufacturing a recess-processed product, and in particular, a method in which a predetermined recess is advantageously formed by half punching with a press, and the desired recess-processed product can be manufactured economically advantageously. It is about.

  Conventionally, a product in which a recess is formed by a predetermined processing has been used as one of components of a machine / device in various applications. For example, an automatic transmission disclosed in Japanese Patent Laid-Open No. 2006-132632 is disclosed. It has been used as a mission component such as a balancer in a piston for a machine, and as a piston member in a friction engagement device for an automatic transmission disclosed in Japanese Patent Application Laid-Open No. 2004-36651.

  By the way, a mission component used as a balancer or the like which is such a recess processed product is attached to a rotating shaft at the central portion thereof and is rotated. For example, FIG. 1 to FIG. In this way, it is assumed that it has an annular shape in plan view. Specifically, the balancer 2 includes a flat portion 4 having an annular flat surface with a predetermined width, a flange portion 6 with a predetermined height integrally provided on the outer periphery thereof, and the flat portion 4. A plurality of recesses having a truncated cone-shaped inclined portion 8 rising from the inner peripheral edge portion, and the flat portion 4 and the inclined portion 8 in plan view along the circular continuous portion. Reference numeral 10 denotes a structure in which the bottomed circular holes are arranged close to each other. In addition, many recesses 10 arranged in a circular hole shape in the balancer 2 are used as a seating surface of the coil spring and are assembled to the transmission.

  Then, when such a recess processed product used as the balancer 2 is manufactured by pressing, the recess 10 is formed by half punching (half punching) using a punch and a die. Then, the formation site of the recess 10 is applied to the inclined portion 8, and the punch bites deeply into the inclined portion 8, and reaches half or more of the plate thickness. X), there is a problem that material breakage is caused in the portion of the recess 10 on the inclined portion 8 side. For this reason, the recess 10 is formed by cutting at present. there were.

  However, it is very time-consuming to perform such a recess forming operation on all of the many recesses by cutting, which results in inferior productivity and manufacturing cost. There was a problem such as an increase in.

JP 2006-132632 A JP 2004-36651 A

  Here, the present invention has been made against the background of such circumstances, and the problem to be solved is that the intended recess extends from the flat portion to the inclined portion of the recess processed product. An object of the present invention is to provide a technique that can be formed easily and easily by half punching by a press and can manufacture such a recess processed product at a low cost.

  In the present invention, in order to solve such problems, the flat portion having a flat surface and the inclined portion rising from the flat portion are inclined, and the flat portion and the inclined portion are straddled. A punch having a cross-sectional shape corresponding to an opening shape of the recess in the recess processed product, and a method of manufacturing a recess processed product in which the bottomed recess is processed so as to be positioned Half punching by pressing using a die having an opening that matches the cross-sectional shape of the punch and having a die hole for receiving the material extruded by the punch, the inner wall surface of the die hole of the die is And a curved surface having a radius of curvature of 0.3 mm or more at the opening edge of the die hole located on the inclined portion side of the die. In the formed form The manufacturing method of the recess processed product characterized in that the recess is formed by carrying out the above is the basic configuration.

  According to one preferred embodiment of the method for manufacturing a recess processed product according to the present invention, the recess processed product is connected to an annular flat portion and an inner peripheral edge or an outer peripheral edge of the flat portion. And a plurality of the recesses having a circular hole shape along the flat connecting portion and the circular connecting portion of the inclined portion. They are arranged at a predetermined interval.

  Furthermore, according to one of the desirable aspects of the manufacturing method of the recessed product according to this invention, the opening edge part of the die hole located in the said inclination part side of the said die, and the die located in the said flat part side In the connection region with the opening edge of the hole, a curved surface is formed in which the radius of curvature gradually decreases from the former toward the latter.

  In addition, in another preferred embodiment of the method for manufacturing a recess processed product according to the present invention, the die hole is located on the inclined portion side from the tapered surface to the flat surface. The curved surface is formed at a connecting portion between the straight surface and the inclined surface of the inclined portion.

  Furthermore, in the present invention, after the half punching process using the punch and the die, a step of cutting a protrusion formed on the back corresponding to the recess of the obtained press-processed product is further performed. The configuration to be adopted is preferably adopted.

  Thus, according to the manufacturing method of the recess processed product according to the present invention, the die used for the half punching process by the press is an inner wall surface formed of a tapered surface inclined at a predetermined angle in the die hole form. In addition, a curved surface having a large radius of curvature is formed at the opening edge of the die hole located on the inclined portion side in the recessed portion processed product, so that a half punching process for forming a desired recessed portion is performed. In this case, the material pushed out by the punch is effectively guided into the die hole, and also when the inclined portion is pressed, the material is advantageously placed in the die hole due to the presence of the curved surface provided at the opening edge of the die hole. It can be made to flow, and the breakage at the part can be advantageously suppressed or prevented.

  Therefore, according to the present invention, since the intended recess processing product can be manufactured by half punching with a press using a punch and a die, compared with the conventional manufacturing method by cutting. This makes it possible to manufacture easily and easily with high productivity, and thus the manufacturing cost of such a recess processed product can be advantageously reduced.

It is an isometric view explanatory drawing which shows an example of the balancer of the mission components which is one of the recess processing products made into the object of this invention. FIG. 2 is an explanatory plan view of the balancer shown in FIG. 1. It is an AA cross-sectional enlarged view explanatory drawing in FIG. It is a BB cross-section enlarged partial explanatory view in FIG. It is a cross-sectional enlarged partial explanatory view equivalent to FIG. 3 which shows the form which formed the recess by normal press work. It is a section expansion explanatory view showing an example of a form which carries out half punching by a press according to the present invention. FIG. 7 is an enlarged explanatory view showing a Y portion in FIG. 6 in an exploded manner. It is explanatory drawing which expands further and shows the opening part vicinity of the die hole of the die | dye used in FIG. 6, (a) is an enlarged partial explanatory drawing in the cross-sectional form shown by FIG. 7, (b) is It is a plane form expansion explanatory drawing. It is an expanded sectional explanatory view showing the state of a punch, a material, and a die when carrying out a half punching process according to the present invention. It is an expanded section partial explanatory view showing the process of excising the projection part of a recess back part from the press work obtained by half punching according to the present invention.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, the recess processed product targeted in the present invention has a flat portion having a flat surface, and such a flat portion, specifically, an inclined portion rising from the flat surface. A bottomed recess is processed and formed so as to straddle the inclined portion. In particular, in the present invention, as shown in FIGS. The present invention is advantageously applied in the manufacture of a product such as a balancer, which is a mission component, in which the recesses of the two need to be arranged close to each other. Such a balancer 2 shown in FIG. 1 to FIG. 4 includes a continuous portion having a circular shape in a plan view of a flat portion 4 having an annular flat surface and a truncated cone-shaped inclined portion 8 rising from an inner peripheral edge thereof. A plurality of bottomed recesses 10 are arranged close to each other so as to straddle the flat part 4 and the inclined part 8 at the installation site, and are arranged in a circular shape in plan view. It is what has.

  And when manufacturing such a recess processing product, the predetermined metal plate material is subjected to a molding process such as press molding, and has a flat part 4 and an inclined part 8 rising from the flat part 4. After the product material having the product shape is formed, the product material is subjected to half punching using a punch and a die according to the present invention. In addition, as a metal plate material which gives such a product material, when it is a material which is relatively hard and poorly stretched, for example, a plate material made of a hot-rolled steel plate such as SPH590, the features of the present invention will be exhibited more advantageously. .

  That is, in the present invention, a product material having a predetermined shape obtained as described above is set in a predetermined press mold, and half-cutting by pressing is performed, an example of which is shown in FIG. It is shown. There, the product material 12 is pressed using a die 18 constituting a part of a press die 14 for holding the product material 12 and a punch 16 disposed so as to face the die 18. A half punching process (half punching process) is performed so as to stop at an intermediate portion of the thickness of the material 12.

  Specifically, as shown in FIG. 7, the punch 16 has a cross-sectional shape (here, a circular shape) corresponding to the opening shape of the recess 10 in the recess processed product (2). On the other hand, the die 18 has a die hole 20 at a site corresponding to the recess 10 formation site in the product material 12 to be set. The die hole 20 has an opening that matches the cross-sectional shape of the punch 16, and accepts a material extruded from the product material 12 by the pressing action of the punch 16. Moreover, as is apparent from FIGS. 7 and 8, such a die hole 20 is configured as a tapered surface whose inner wall surface 22 is inclined inward, and on the inclined portion 12 a side of the product material 12. A curved surface 24 having an outwardly convex shape is formed at the edge of the die hole opening. And the angle in the range of 5 degrees-15 degrees is employ | adopted as inclination-angle: (alpha) of the inner wall surface 22 of the die hole 20 in this dice | dies 18. FIG. In addition, if it deviates from this angle range, the flow of the material is not sufficient, and the action or effect of the present invention is difficult to be exhibited effectively.

  Further, as shown in FIG. 8, the curved surface 24 provided at the opening edge portion of the die hole 20 is, here, the die hole 20 located on the inclined surface 18 a of the die 18 that supports the inclined portion 12 a of the product material 12. In the connection region between the opening edge and the opening edge of the die hole 20 located on the flat surface 18b of the die 18 that supports the flat portion 12b of the product material 12, the flat surface 18b side from the portion located on the inclined surface 18a side. The curved surface has a radius of curvature that gradually decreases toward the portion located at the center, and is connected to a small curved surface at the opening edge of the die hole 20 located on the flat surface 18b, for example, a curved surface having a radius of curvature of about 0.1 mm. It has come to be. Here, the radius of curvature of the curved surface 24 located at the inclined surface 18a portion needs to be at least 0.3 mm or more, preferably 0.4 mm or more, and by doing so, 50% or more of the plate thickness. Even if half blanking is performed, the material breakage can be advantageously suppressed or prevented. Note that the upper limit of the radius of curvature of the curved surface 24 is generally about 1.0 mm, and adoption of an excessively large radius of curvature is disadvantageous in securing the accurate shape of the recess 10. It is.

  Furthermore, here, the part located on the inclined surface 18a side of the tapered inner wall surface 22 of the die hole 20 is from the same height as the flat surface 18b of the tapered inner wall surface 22 with respect to the flat surface 18b. It is formed as a straight surface 26 extending in a vertical direction, and an opening edge portion extending from the straight surface 26 to the inclined surface 18a is formed as the curved surface 24 having a large curvature radius as described above. Due to the presence of such a straight surface 26, it is possible to effectively suppress or prevent the thrust load from acting on the die 18 during the half punching process, and to advantageously avoid the occurrence of problems such as breakage of the die. It is like that.

  In the present invention, the punch 16 and the die 18 having the above-described configuration are used, with respect to a predetermined position straddling the inclined portion 12a and the flat portion 12b in the product material 12, as shown in FIGS. As shown in the drawing, a recess 10 corresponding to the shape of the punch 16 is formed by stopping the punch 16 in the middle of the thickness of the product material 12 without punching with the punch 16, in other words, without punching with the punch 16. At the same time, the part of the product material 12 opposite to the side where the recess 10 is formed is pushed into the die hole 20 of the die 18.

  In this way, in the present invention, in such a half punching process, the die hole 20 of the die 18 is a taper whose inner wall surface 22 is inclined inward at a predetermined angle, as is apparent from FIGS. The opening edge portion which is formed as a surface and is located on the inclined portion 12a side of the product material 12, in other words, located on the inclined surface 18a side of the die 18 supporting the inclined portion 12a has a relatively large radius of curvature. The material pushed out by the punch 16 from the portion formed as a curved surface having an effective flow into the die hole 20 due to the presence of the tapered surface (22) and the curved surface 24, Therefore, even if a half punching process exceeding 50% of the plate thickness is performed, problems such as the occurrence of breakage on the inclined portion 12a side can be advantageously avoided. As a result, the intended recessed portion processed product can be manufactured easily and easily with high productivity by pressing, and the manufacturing cost can be advantageously reduced.

  It should be noted that such a half punching process is applied to the product material 12, and the obtained press-formed product 28 is opposite to the side on which the intended recess 10 is formed, as shown in FIG. The shape is such that the frustoconical protrusion 30 is formed on the side surface, that is, the back surface. However, such protrusion 30 is not suitable for assembly with other members. From the point of obstruction, a process of cutting it out by a normal cutting process or the like is preferably employed. However, if such a protrusion 30 does not interfere with the use of the press-processed product 26 as a recessed product, it can be used as it is without being cut off.

  As described above, according to the present invention, the intended recessed portion processed product can be advantageously manufactured by press working. In addition to the balancer, a piston member or the like in a transmission such as an automatic transmission can also be the target.

  Moreover, in embodiment shown by drawing, although the product raw material 12 is made into the form by which the truncated cone-shaped inclination part 12a is continuously provided in the inner peripheral part of the annular | circular shaped flat part 12b, Are also in the opposite form, that is, in the form in which the inverted frustoconical inclined part (12a) is connected to the outer peripheral edge of the annular flat part (12b). A recess 10 straddling the part can be formed according to the present invention.

  Furthermore, in the illustrated embodiment, the curvature radius of the curved surface 24 provided at the opening edge on the inclined surface 18a side of the die hole 20 is such that the flat surface 18b is connected to the opening edge on the flat surface 18b side. The opening edge of the die hole 20 located on the inclined surface 18a side is formed as a curved surface having the largest curvature radius at the highest position of the inclined surface 18a. On the other hand, as the height of the inclined surface 18a becomes lower, it can be configured as a curved surface with a gradually decreasing radius of curvature and connected to the opening edge of the die hole 20 on the flat surface 18b side.

  Furthermore, the length (size) in the depth direction of the die hole 20 is appropriately selected even on the straight surface 26 that connects the inner wall surface 22 formed of the tapered surface of the die hole 20 and the curved surface 24. In general, however, it is determined by the inclination angle of the inclined surface 18a of the die 18, the size of the die hole 20, the taper angle of the inner wall surface 22, and the like.

  In addition, although not listed one by one, the present invention can be implemented in a mode with various changes, modifications, improvements, and the like based on the knowledge of those skilled in the art, and such a mode of implementation is not limited to this. It goes without saying that any one of them falls within the scope of the present invention without departing from the spirit of the invention.

2 Balancer 4 Flat part 8 Inclined part 10 Recess 12 Product material 12a Inclined part 12b Flat part 14 Press die 16 Punch 18 Die 18a Inclined surface 18b Flat surface 20 Die hole 22 Inner wall surface 24 Curved surface 26 Straight surface 28 Press molded product 30 Protrusion

Claims (5)

While having a flat portion having a flat surface and an inclined portion rising from the flat portion, the bottomed recess is processed so as to be located across the flat portion and the inclined portion. To make a processed product,
A die having a punch having a cross-sectional shape corresponding to the opening shape of the recess in the recess processed product, and a die hole having an opening that matches the cross-sectional shape of the punch and receiving a material extruded by the punch. The die punching process using a press is used as a taper surface in which the inner wall surface of the die hole of the die is inclined at an angle of 5 ° to 15 ° inward, and is further positioned on the inclined portion side of the die. An opening edge of the die hole is formed in a form in which a curved surface having a radius of curvature of 0.3 mm or more is formed. Production method.   The recessed portion processed product has an annular flat portion and a truncated cone-shaped or inverted truncated cone-shaped inclined portion connected to the inner peripheral edge or the outer peripheral edge of the flat portion. The method of manufacturing a recess processed product according to claim 1, wherein a plurality of the recesses having a circular hole shape are disposed at predetermined intervals along a circular continuous portion of the flat portion and the inclined portion. .   In the connection region between the opening edge of the die hole located on the inclined portion side of the die and the opening edge of the die hole located on the flat portion side, a curved surface whose radius of curvature gradually decreases from the former toward the latter The manufacturing method of the recess processed product of Claim 2 currently formed.   The portion where the die hole is located on the inclined portion side has an inner wall surface composed of a straight surface extending in a direction perpendicular to the flat surface from the tapered surface, and the inclined surface of the straight surface and the inclined portion The manufacturing method of the recessed processed product of Claim 2 or Claim 3 in which the said curved surface is formed in the connection site | part. The process of cutting the protrusion part formed in the back part corresponding to the said recessed part of the press-processed product obtained after the half punching process using the said punch and die | dye is further implemented. The manufacturing method of the recess processed product of any one of Claims 1.

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