JP3146487U - Forging machine - Google Patents

Abstract

An object of the present invention is to prevent seizure by cooling a punch and radiating a cooling liquid onto a blank end face while forming a molded product having a highly accurate hole with a matching axis.
A punch guiding taper portion 4b is formed at the entrance of a forming hole 4a of a die 4. The punch 6 includes a center punch 61 fixed to the punch case 7, and a cylindrical guide body 62 that is slidably fitted on the outer periphery of the punch 6 and has a tapered portion that fits into the tapered portion 4b at the tip of the cylindrical guide body 62. 62a is provided. The first extrusion means 8 for urging the cylindrical guide body 62 to the die side with a predetermined fluid pressure, and after forging, the cylindrical guide body 62 is pushed to the die side by the extrusion rod 13 to form a molded product when the punch is retracted. And a second extrusion means 10 for keeping the inside of the die. A coolant guide recess 62 c for cooling the center punch 61 is provided in the cylindrical guide body 62. A discharge hole 62d for discharging the coolant in the housing recess 62c toward the end surface of the blank A is formed at the tip of the cylindrical guide body 62. The punch case 7 is provided with a cooling liquid supply device 14 for sending the cooling liquid to the housing recess 62c.
[Selection] Figure 2

Description

  The present invention provides a molded product of a predetermined shape by forging a blank between a die provided on a machine base and a punch attached to a front surface of a ram via a punch case so as to face the die. The present invention relates to a compacting machine for molding.

  Conventionally, in this type of forging machine, for example, when forging a bottomed cylindrical molded product having a hole formed in the center from a columnar blank, a punch having a smaller diameter than that of the blank is used, and the punch is used for chucking. Is pressed into a die having a molding hole of substantially the same diameter as the blank, thereby forging a bottomed cylindrical molded product having a hole formed in the center. .

  However, according to the above-described forging machine, when the blank sandwiched between the chucks by pressing the punch into the die is press-fitted into the die forming hole, the die forming hole is held only by the tip of the punch. Since the structure is formed by press-fitting into the punch, it is difficult to hold the blank only with the tip of the punch, and there is a problem that the blank is likely to fluctuate against the punch. Also, the punch and die when the punch is pressed into the die As for the concentricity, the axis of the molded product and the axial center of the hole portion are difficult to mold.

  In addition, there is a problem that the punch becomes hot due to frictional heat generated when the punch press-fits the blank into the die forming hole, and seizure occurs between the tip of the punch and the molded product.

  Therefore, the present invention can form a molded product having a highly accurate hole with the same axial center, but effectively performs seizure by simultaneously cooling the punch and radiating the cooling liquid to the blank end face. An object of the present invention is to provide a forging machine that can be prevented.

  In order to solve the above-mentioned problem, the present invention is forging a blank between a die provided on a machine base and a punch attached to a front surface of a ram via a punch case so as to face the die. A center punch for forming a molded product of a predetermined shape, wherein a taper portion for guiding the punch is formed at the inlet side tip of the die forming hole, and the punch is fixedly attached to the punch case And a cylindrical guide body that is slidably fitted on the outer periphery of the center punch, a tapered portion that is fitted to the tapered portion of the die is formed at the tip of the cylindrical guide body, and the punch case A first pushing means is provided on the back side to urge the cylindrical guide body to the die side at all times by a predetermined fluid pressure, and after forging, the cylindrical guide body is forcibly pushed to the die side by the push rod. Move While the second extrusion means for holding the molded product in the die when the punch is retracted is provided, an accommodation recess for cooling the center punch by accommodating the cooling liquid is formed on the inner surface of the cylindrical guide body, A discharge hole for discharging the coolant in the receiving recess toward the blank end surface is formed at the tip of the cylindrical guide body, and the coolant is supplied to the punch case when the cylindrical guide body is advanced to the die side. A cooling liquid supply device that feeds into the housing recess is provided.

  According to the present invention, the blank can be press-fitted into the die without wobbling while the blank is held by the center punch and the cylindrical guide body, and at the tip of the die inlet tip and the cylindrical guide body. Since the taper portion of the same angle is formed, the concentricity of the die and the cylindrical guide body by fitting the taper portion of the cylindrical guide body to the taper portion of the die, and consequently the die and the center punch. Concentricity is obtained, and the center punch can be press-fitted into the blank and molded in this fitted state, so that a molded product having a highly accurate hole with a matching axial center can be formed. In addition, a housing recess is formed on the inner surface of the cylindrical guide body to store the coolant and cool the center punch, and the coolant in the storage recess is discharged toward the blank end surface at the tip of the cylindrical guide body. The punch hole is provided with a cooling liquid supply device that feeds the cooling liquid from the outside to the housing recess when the cylindrical guide body is advanced to the die side. It is possible to effectively prevent seizure between the center punch and the molded product by performing cooling and radiation of the cooling liquid to the blank end face.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a schematic plan view of a forging machine according to the present invention. In this forging machine 1, a die block 3 fixed to a predetermined position of a machine base 2 is provided with a plurality of dies 4. A ram 5 that moves forward and backward with respect to the die block 3 is provided, and the same number of punches 6 as the die 4 are disposed on the front surface of the ram 5 via punch cases 7 respectively. In this case, a plurality of forging stations are constituted by the die 4 and the punch 6, and the die 4 and the punch 6 are associated with the forward and backward movement of the punch with respect to the die 4 and the material transfer between the forging stations by the chuck transfer means. The blank B supplied is sequentially sent to each forging station by the chuck transfer means, and is formed into a molded product B having a desired shape step by step. Of course, the forging machine 1 may be a single-stage type as well as a multi-stage type as shown in the figure.

  As shown in FIG. 2, for example, a tapered portion 4 b that guides the punch 6 is formed at the inlet tip portion of the forming hole 4 a of the final stage die 4. On the other hand, the punch 6 includes a center punch 61 that is fixed to the punch case 7, and a cylindrical guide body 62 that is slidably fitted on the outer periphery of the center punch 61. Is formed with a taper portion 62 a that fits into the taper portion 4 b of the die 4. Further, on the back side of the punch case 7, there is provided a first pushing means 8 that constantly urges the cylindrical guide body 62 toward the die side by a predetermined fluid pressure, and after the forging forming, the cylindrical guide body 62. Is pushed by the extrusion rod 9 toward the die side, and second extrusion means 10 is provided to keep the molded product B in the die 4 when the punch 6 is retracted.

  As the first pushing means 8, an air cylinder chamber 7a is formed in the sliding passage of the cylindrical guide body 62 in the punch case 7, and at the rear end of the cylindrical guide body 62 on the inner surface of the air cylinder chamber 7a. A flange portion 62b is formed so as to be fitted along, and the cylindrical guide body 62 is moved to the front side of the punch case 7 by a piston action by supplying air to the air cylinder chamber 7a. An air supply device 81 is connected to the air cylinder chamber 7a via an air supply passage 7b. In addition, as the 1st extrusion means 8 of the cylindrical guide body 62, you may use fluid extrusion mechanisms, such as a hydraulic cylinder mechanism other than an air cylinder mechanism, for example.

  Further, as the second pushing means 10, the pressure receiving member 11 provided at the rear end portion of the center punch 61 and a plurality of pushing rods 13 penetrating the fixing member 12 of the center punch 61 are used to move the rear of the flange portion 62b of the cylindrical guide body 62. The end is pushed out. The extrusion rod 13 normally stands by in the vicinity of the air supply passage 7b of the air cylinder chamber 7a. After the blank A is formed by the center punch 61, the extrusion rod 13 is appropriately extruded at the timing when the center pin 61 moves backward. (Not shown) is pushed to the cylindrical guide body 62 side by the moving shaft 10a, and the rear end of the flange portion 62a of the cylindrical guide body 62 is pushed to the die side to prevent the molded product B from coming out of the die 4. Has been made. In addition, as an extrusion mechanism, you may employ | adopt a drive mechanism, such as a cam mechanism linked with the drive system of a forging machine, or a cylinder, for example.

  As shown in FIGS. 2 and 3, the inner surface of the cylindrical guide body 62 is formed with an accommodating recess 62c for accommodating a cooling liquid such as oil coolant and cooling the center punch 61, and is cylindrical. A large number of discharge holes 62d for discharging the coolant in the housing recess 62c toward the end surface of the blank A are formed at the front end portion of the guide body 62, while the punch case 7 advances toward the die side of the cylindrical guide body 62. A supply passage 7c that communicates with the through-hole 62e provided in the housing recess 62c in the radial direction at a position and feeds the coolant from the outside to the housing recess 62c is provided. The coolant supply device 14 is provided in the supply passage 7c. It is connected.

  Next, the operation of the above-described embodiment will be described.

  First, as shown in FIG. 2, when the punch side is in the retracted position with respect to the die 4, air is supplied from the air supply device 81 to the air cylinder chamber 7 a, so that the cylindrical guide body 62 is attached to the center punch 61. Extruded to the tip side. Next, when the ram 5 moves forward, as shown in the upper half side of FIG. 4, the tip end portion of the cylindrical guide body 62 first hits the blank A held by the chuck 15 of the chuck transfer means, and comes into contact therewith. When the resistance acts, the cylindrical guide body 62 moves backward with respect to the center punch 61. Next, when the center punch 61 hits the blank A, the center punch 61 and the cylindrical guide body 62 hold the blank A together and push the blank A into the forming hole 4a of the die 4 without fluttering.

  Further, since the tapered tip portions 4b and 62a of the same angle are formed at the inlet tip portion of the forming hole 4a of the die 4 and the tip portion of the cylindrical guide body 62, the lower half portion side of FIG. 4 and FIG. As described above, the concentricity of the die 4 and the cylindrical guide body 62 due to the fitting of the tapered portion 62a of the cylindrical guide body 62 to the tapered portion 4b of the die 4 and thus the concentricity of the die 4 and the center punch 61. Will be obtained. Then, the center punch 61 is blank A while the taper portion 62a of the cylindrical guide body 62 is fitted to the taper portion 4b of the die 4 and the concentricity between the die 4 and the center punch 61 is obtained. Since a molded product is produced by being press-fitted into the molded product B, it is possible to mold the molded product B having a highly accurate hole portion with a matching axis.

  On the other hand, on the inner surface of the cylindrical guide body 62, an accommodation recess 62c for accommodating the coolant and cooling the center punch 61 is formed, and the coolant in the accommodation recess 62c is formed at the tip of the cylindrical guide body 62. 62d is formed in the punch case 7 so as to extend toward the die A side of the cylindrical guide body 62 and extend in the radial direction. Since the coolant supply device 14 that communicates with 62e and feeds coolant from the outside to the housing recess 62c is provided, the center punch 61 that is heated by frictional heat during molding can be cooled by the coolant in the housing recess 62c. At the same time, when the next blank A is formed, the above-described forging is performed after the coolant is radiated to the end face of the blank. Thereby, seizure between the center punch 61 and the molded product B can be effectively prevented.

  It is a schematic explanatory drawing of the forging machine based on this invention.   It is a longitudinal cross-sectional view of the principal part of the same forging machine.   It is a side view of the punch.   It is an expanded longitudinal cross-sectional view of the principal part explaining operation | movement of the same forging machine.   It is explanatory drawing of the press-fit state to the die | dye of the blank by the same forging machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Forging machine 2 Machine stand 4 Die 4b Tapered part 5 Ram 6 Punch 7 Punch case 8 1st extrusion means 10 2nd extrusion means 61 Center punch 62 Cylindrical guide body 62a Tapered part 62c Receiving recessed part 62d Release hole A Blank B Molding Goods

Claims (1)

  Forging molding that forms a molded product of a predetermined shape by forging a blank between a die provided on the machine base and a punch attached to the front surface of the ram via a punch case so as to face the die A taper portion that guides the punch is formed at the inlet side tip of the die forming hole, and the center punch that is fixedly attached to the punch case and the outer periphery of the center punch are slid A cylindrical guide body that is freely inserted and inserted, a tapered portion that fits into the tapered portion of the die is formed at the tip of the cylindrical guide body, and the cylindrical guide body is provided at the back side of the punch case. The first extrusion means is always provided to the die side due to the fluid pressure of the cylinder, and after forging, the cylindrical guide body is forcibly pushed to the die side by the extrusion rod, and the molded product is removed when the punch is retracted. Inside the die While the second push-out means for staying is provided, an accommodation recess for accommodating the coolant and cooling the center punch is formed on the inner surface of the cylindrical guide body, and the accommodation recess at the tip of the cylindrical guide body A cooling liquid supply device is formed in which a discharge hole for discharging the inner cooling liquid toward the blank end face is formed, and the cooling liquid is fed into the housing recess from the outside when the cylindrical guide body advances to the die side in the punch case. A forging machine characterized by being provided.

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