JPH0741353B2 - Forging die core adjustment device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core adjusting device for a forging die.

[0002]

2. Description of the Related Art In recent years, in hot automatic forging presses,
It has become possible to manufacture complicated molded products by so-called multi-step work using three to seven sets of upper and lower molds.

[0003]

However, in order to improve the dimensional accuracy of a molded product when a complicated molded product is manufactured by the multi-step operation as described above, in order to improve the dimensional accuracy of the molded product, especially the left and right directions of a pair of upper and lower molds. Misalignment must be minimized, but the horizontal pitch of the lower and upper dies shifts due to the heat effects of mold preheating (at the start of work) and during forging work (during work), so-called misalignment There was a problem that occurs.

Therefore, the present invention solves the above-mentioned conventional problems, and can adjust the lateral misalignment of the forging die and can perform the adjustment in the space in the front direction of the die. An object is to provide a mold core adjusting device.

[0005]

In order to achieve the above object, according to the present invention, a part in the circumferential direction is cut out between one of the upper and lower molds and a holder for supporting the molds. An eccentric ring formed so that the extension lines of the notched both end surfaces are continuous with each other in a straight line when viewed from a plane, the outer peripheral surface of the eccentric ring is in sliding contact with the inner peripheral surface of the holder, and the inner peripheral surface is the outer peripheral surface of the mold. And the center of the inner diameter is eccentric from the center of the holder by a predetermined distance so that the mold is held. In addition, the tip surfaces of the eccentric wheel protruding from the front surface of the holder into the holder are in contact with both end surfaces of the eccentric wheel, and by moving either one forward and the other backward, the eccentric wheel is rotated to adjust the center of the inner diameter. The bolt is screwed through the holder so that it can move sideways.

[0006]

When one of the adjusting bolts is moved forward and the other is moved backward, the eccentric wheel rotates and the center of the inner diameter of the eccentric wheel shifts in the left-right direction. Accordingly, the center of the mold in which the inner peripheral surface and the outer peripheral surface of the eccentric wheel are in sliding contact with each other moves to the same position in the left-right direction, and the center of the mold in the left-right direction with respect to other molds that are paired up and down. Adjustments are made.

[0007]

EXAMPLE FIG. 1 shows an example of a hot automatic forging press which uses 5 sets of upper and lower forging dies and performs multi-step work. 1 is an upper die, 2 is a lower die, 3 and 4 are Holders for supporting these molds, 5, 6 are upper and lower die holders, 7 is a ram, 8 is a bed, and x ₁ , x ₂ , x ₄ , x ₅ are upper mold 1 and lower mold 2 Shows the amount of deviation in the left-right direction.

In this embodiment, the upper mold 1 adjusts the misalignment of the upper mold 1 and the lower mold 2 in the left-right direction. 2 is a front view in which the left half portion of the portion B in FIG. 1 is broken, and FIG. 3 is a line A in FIG.
It is a cross-sectional plan view along -A. In both figures, a plate ring 10 is fixed to the upper die holder 5. A hollow cylindrical holder 3 having an inward engaging flange 11 at the lower end is fixed to the plate ring 10. A cylindrical upper mold 1 having an engaging protrusion 12 on the outer periphery of the upper end in the holder 3 makes the upper surface of the engaging protrusion 12 abut against the lower surface of the upper die holder 5 from inside the plate ring 10 and lower end. The parts are arranged so as to project downward from the engaging collar part 11. An eccentric ring 13 is provided between the upper mold 1 and the holder 3, and the outer peripheral surface of the eccentric ring 13 is held by the holder 3
Slidably contact the inner peripheral surface of the upper die 1 and the inner peripheral surface slidably contact the outer peripheral surface of the upper die 1, and the center P of the inner diameter (also the center of the upper die 1)
Is eccentric from the center Q of the holder 3 by a predetermined distance e, and is fitted so as to hold the upper mold 1. The upper die 1 is supported by engaging the engaging projection 12 with the upper end surface of the eccentric wheel 13. The eccentric ring 13 is partially notched in the circumferential direction, and the extension lines of the notched end surfaces 14 and 15 are formed so as to be continuous with each other when viewed from the plane.

Reference numerals 17 and 18 denote a pair of adjusting bolts which penetrate the holder 3 from the front surface thereof and are screwed so as to be able to move forward and backward, and project into the holder 3 at both end surfaces 14 and 15 of the eccentric wheel 13. The eccentric wheel 13 can be rotated by abutting the aforesaid tip surfaces and advancing one of them and retracting the other. 19 and 20 are lock nuts. 21 in Figure 2
Is a key groove formed between the outer peripheral surface of the engaging protrusion 12 of the upper mold 1 and the inner peripheral surface of the plate ring 10, and 22 is a rotation stopping key of the upper mold 1 fitted in the key groove 21, The keyway 21 of this key 22
The clearance between and is set to a value larger than the maximum value of the moving distance of the upper mold 1 in the front-rear direction at the time of adjustment, for example, about 0.05 mm. Reference numeral 23 is an upper die KO pin, 24 is a spring, 25 is an upper KO pin attached to the ram 7, and 26 is an insertion hole for a bolt (not shown) for fixing the holder 3 to the plate ring 10.

The operation of the above embodiment will be described with reference to FIG.
After releasing the lock nuts 19 and 20, one adjustment bolt 17
When the eccentric ring 13 is rotated counterclockwise as shown by the arrow when the adjustment bolt 18 is moved forward and tightened by tightening the other adjustment bolt 18, the eccentric ring 13 is rotated rightward as shown by the chain line. Moving. Along with this, the upper die 1 also moves as shown by the chain line, and its center P has a distance x in the right direction and a distance y in the rear direction.
Is shifted to Pa at. When the rotation angle θ is small, for example, 3 ° to 5 °, the distance y becomes 1/38 and 1/23 of the distance x, for example, when e is 12 mm,
The distance x is 0.63 mm and 1.05 mm, and the distance y is 0.016 mm and 0.046 mm, respectively, which are small moving distances that can be ignored in the misalignment adjustment of the mold. In FIG. 3, the rotation angle θ is increased to about 35 ° for easy understanding. As described above, the center adjustment in the left-right direction with respect to the lower mold 2 of the upper mold 1 is performed.

In this embodiment, since the lower die 2 has a die lubrication device and the like and is narrow, the upper die 1 is provided with a device for core adjustment, but the lower die 2 may be provided. Of course. Further, the shape of the eccentric wheel 13 and the like are merely preferable examples, and various modifications can be made without changing the gist.

[0012]

Since the present invention has the above-described structure, the eccentric ring can be rotated by adjusting the adjusting bolt, and the misalignment in the left-right direction of the forging die for multi-step work can be easily adjusted. Moreover, there is an excellent effect that the adjustment can be performed in the space in the front direction of the mold with a sufficient space, which is extremely practical.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a hot automatic forging press that performs multi-step work by using five sets of upper and lower forging dies.

FIG. 2 is a front view in which a left half portion of a portion B in FIG. 1 is cut away.

3 is a cross-sectional plan view taken along the line AA of FIG.

FIG. 4 is an operation explanatory view.

[Explanation of symbols] 1 Upper mold 2 Lower mold 3 Holder 5 Upper die holder 10 Ring plate 13 Eccentric ring 14,15 End surface 17,18 Adjustment bolt

Claims (1)

[Claims] 1. A forging die for a hot automatic forging press having a plurality of cylindrical upper and lower dies supported by a hollow cylindrical holder in the left-right direction, and one of the upper and lower dies and the die. An eccentric ring formed by cutting out a part in the circumferential direction between the holder and a holder supporting the mold, and extending the cutout end surfaces so that they extend in a substantially straight line when viewed from a plane. The holder is slidably contacted with the inner peripheral surface of the holder, the inner peripheral surface is slidably contacted with the outer peripheral surface of the mold, and the center of the inner diameter of the holder is eccentric from the center of the holder by a predetermined distance to fit the mold. , The end faces protruding into the holder from the front face of the holder are in contact with the both end faces of the eccentric wheel,
A core of a forging die characterized in that an eccentric wheel is rotated by moving one of them forward and the other backward to adjust an inner diameter center of the eccentric wheel through a holder so that the bolt can be moved sideways. Adjustment device.