JPS5927967Y2 - Die set for hot press forging machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a die set for a hot press forging machine.

Conventional die sets for hot press forging machines have cylindrical guide posts on both left and right sides or four corners of the lower die holder, and guide bushes on the upper die holder to receive these guide posts. Generally speaking, when the mold and mold holder are exposed to high temperatures, this heat causes distortion in the upper mold holder and lower mold holder, and the dimensions between the guide posts and guide bushes change. For this reason, it is necessary to provide a fairly large gap between the guide post and the guide bush to absorb this distortion, and the original function of the die set, which is to precisely align the upper and lower dies, must be provided. There was a drawback that it could not be used to its full potential.

The present invention was completed with the aim of creating a die set for a hot press forging machine that does not have the above-mentioned drawbacks.The present invention will be explained in detail below with reference to the illustrated embodiments.

In the figure, 1 is an upper mold holder attached to a ram (not shown); 2
is a lower mold holder attached to a bolster so as to face the upper mold holder 1, and a guide step 3 is protruded from one side of the lower surface of the upper mold holder 1 by bolts 4, 4. Furthermore, a guide step 5 is provided on the upper surface of the lower die holder 2 at a position opposite to the guide step 3 by a bolt 6.6.

Reference numerals 7, 8, and 9 are three elongated protuberances provided on the upper surface of the guide step 5, and the central elongate protuberance 7 is the center portion of the guide step 5, that is, the left and right elongate protrusions 8 and 9, which will be described later. The left and right elongated protuberances 8.9 extend perpendicularly to the central elongated protrusion 7, that is, in the longitudinal direction of the guide step 5.

On the other hand, the lower surface of the guide step 3 of the upper die holder 1 is provided with three positioning grooves 10, 11, 12 into which the elongated protuberances 7, 8.9 fit. The elongated raised portion 7.8.9 and the grooves 10, 11.12 are the upper mold holder 1.
When the mold holders descend toward the lower mold holder 2, they fit into each other like a dowel as shown in Fig. 1, and the upper mold holder 1 and the lower mold holder 2
Perform mutual alignment with.

As shown in the figure, bushes 13 and 14 are provided on the outer surface of each elongated raised portion and the inner surface of each groove, and
The upper part of the bushing 13 is chamfered so that it can be smoothly inserted into the bushing 14.

A mold mounting plate 15 is attached to the center of the lower surface of the upper mold holder 1, and one end of the mold mounting plate 15 is connected to a locking portion 17 formed at the base of the guide step 3 of the upper mold holder 1. At the same time, the other end 18 is clamped by a U-shaped clamp member 20 driven by a cylinder 19 and attached to the upper mold holder 1, and an upper mold 21 is fixed to the lower surface of this mold mounting plate 15. It is fixed by a tool 22.

Further, a mold mounting plate 23 is attached to the center of the upper surface of the lower mold holder 2 by a clamp member 24 driven by a cylinder, and a lower mold 25 is fixed to the upper surface of the clamp member 24 .

The method for attaching the upper mold 21 and the lower mold 25 is to operate the cylinder to move the clamp members 20 and 24 back and forth.
It has the advantage that the lower mold 25 and the lower mold 25 can be easily attached and detached together with the mold mounting plate 15.23, but the upper mold 21. The method of attaching the lower die 25 to the upper die holder 1 and the lower die holder 2 is not limited to this, and any attachment method may be employed.

With this structure, if the upper die holder 1 attached to the ram of the hot press forging machine is lowered toward the lower die holder 2 attached to the bolster, the guide stage of the lower die holder 2 can be removed. The elongated raised portion 7 and the elongated raised portions 8 and 9 provided on the upper surface of the portion 5 fit into the alignment groove 10 and the grooved grooves 11 and 12 provided on the lower surface of the guide stepped portion 3 of the upper mold holder 1. , the central elongated raised portion 7 and the groove 10 are the mold holder 1,
Since the direction is provided at the center of the mold holder 1,
2, that is, in the left-right direction in FIG. 2, there is no positional shift between the upper mold holder 1 and the lower mold holder 2. 1
, 2 in the longitudinal direction, the upper mold holder 1 and the lower mold holder 2 will not be misaligned in the vertical direction in FIG.

Therefore, the upper mold holder 1 and the lower mold holder 2 are aligned in the X-Y direction, but what should be noted here is that the alignment by the elongated ridges and grooves is In some cases, they should be free to escape in the longitudinal direction.

As a result, for example, in a conventional die set that uses two guide posts on the left and right, it is necessary to provide a gap between the guide posts and the guide bushings that is equivalent to the distance between the guide posts multiplied by the coefficient of thermal expansion. On the other hand, in the case of the present invention, the thermal expansion in the longitudinal direction of the elongated protrusions 7, 8, 9 can be ignored, and only the thermal expansion in the width direction needs to be considered.

In other words, thermal expansion in the left-right direction in FIG. 2 does not pose a problem for the elongated protuberances 8 and 9 on both sides, and only the central elongated protrusion 7 is distorted by the value obtained by multiplying its width by the coefficient of thermal expansion. However, since the width of the elongated protruding portion 7 is only several tens of millimeters, the distortion is so small that it can be ignored, and there is no need to provide a gap to accommodate thermal distortion in the groove 10 into which the elongated protruding portion 7 fits. In this direction, the upper die holder 1 and the lower die holder 2 can be aligned extremely accurately.

Further, thermal expansion in the vertical direction shown in FIG. Since it is formed on a straight line on one side of the lower die holder 2, it is only distorted by the value obtained by multiplying its width by the coefficient of thermal expansion, and a gap is provided in the grooves 11 and 12 for this purpose for thermal distortion. Since this is not necessary, extremely accurate positioning can be achieved in this direction as well.

In this way, the upper mold holder 1 and the lower mold holder 2 are
Since the alignment is extremely accurate in the Y direction, precise hot pressing can be performed.

In the above embodiment, the elongated protrusion was provided on the lower die holder 2 side and the groove was provided on the upper die holder 1 side. It is also possible to provide a section.

As is clear from the description of the embodiments, the present invention has an upper mold holder and a lower mold holder, each of which has an elongated ridge extending in the longitudinal direction of the upper mold holder or the lower mold holder, and a slender ridge extending in a direction perpendicular thereto. On the other hand, the lower die holder or the upper die holder is provided with a groove for positioning into which these elongated protrusions fit, so that even when there is thermal expansion due to hot pressing, This allows extremely accurate positioning in the X-Y directions, and since the positioning is done on the side surfaces of the elongated ridge and groove, the sliding surface is wider and the length is longer than that of a conventional guide post. There is no fear of wear even after long periods of use, and it has great practical value as it eliminates the drawbacks of conventional die sets for hot press forging machines.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway side view showing an embodiment of the present invention, and FIG. 2 is a partially cutaway plan view. 1: Upper mold holder, 2: Lower mold holder, 3 step part for guide,
5 step part for guide, 7, 8.9: elongated raised part, 10,
11°12: Concave groove.

Claims (1)

[Scope of utility model registration request] Guide stepped portion 3 facing upper mold holder 1 and lower mold holder 2
and a guide step 5 are provided in a protruding manner, and elongated raised portions 8 and 9 extending in the longitudinal direction are provided on one of the guide stepped portions, and an elongated raised portion 7 is provided between the elongated raised portions 8 and 9 and extends in a direction perpendicular thereto. At the same time, the other guide step has the elongated protuberance 7,
A die set for a hot press forging machine, characterized in that grooves 10, 11, and 12 for positioning are inserted into which 8.9 is inserted.