JPS5932224B2 - Heading machine die fixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a die fixing device in a heading machine such as a header or a former.

Conventionally, in heading machines such as headers and homers, a die block fixed to a frame facing a reciprocating ram has a device hole, and a die with a forming hole of a shape corresponding to the product to be forged is inserted into the die block. It is removably fitted into the device hole and fixed by pressing its outer periphery in one direction. If there is a gap between the die and the device hole, it will be fixed eccentrically to one side. This may cause misalignment with the axis of the punch, reducing processing accuracy, or breakage due to a lateral load acting on the shaft when pressing the spherical head of the material with a punch that press-forms a cross groove. Because of this,
It is necessary to precisely match the outside diameter of the die to the device hole, but it is difficult to process the outside diameter of a large number of dies to a constant size, and it is difficult to process the outside diameter of a large number of dies to a constant size. It is structurally impossible to fix while aligning the center.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate such drawbacks and provide a device that can be fixed concentrically to a device hole even if the outside diameter of the die is uneven.

Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.

A die block 4 is fitted into a mounting groove 3 formed in a frame 2 facing the reciprocating ram 1, and a shearing die 5 is fitted on one side of the die block 4, and a heading die 6 is fitted on the other side. .

In the device hole γ of the heading die 6, 2 pairs of 4 fitting grooves 8 corresponding to each other are formed at 90 degree intervals, and each fitting groove 8 is provided with a spacer made of a metal having a high coefficient of thermal expansion such as copper. 9 are fitted almost tightly, and a cartridge-type heater 10 and a temperature sensor (not shown) are embedded in each spacer 9, and a lead wire 12 passed through a small hole 11 formed at the rear of the die block 4 It is connected to a temperature control device (not shown).

Then, after forming the die 6 to be slightly smaller than the inner diameter of the device hole 1 and fitting it loosely therein, when electricity is applied to the heater 10 to heat the spacers 9, the corresponding spacing between the spacers 9 becomes narrower due to thermal expansion. The die 6 is pressed toward the center and firmly fixed.

In the above, the spacers 9 may be provided as only one pair of left and right or one pair of upper and lower sides that correspond to each other.

In addition, in a hot or warm opening type heading machine, it is also possible to control the temperature of the heater 10 using a temperature control device for heating the material.

Further, a protruding pin 14 passing through the frame 2 and back plate 16 is inserted from the back side into a forming hole 13 formed at the center of the die 6, and is cut into a fixed length by a cutter (not shown) in the shearing die 5. When the raw material is transferred to the front side of the heading die 6, the punch 15 attached to the tip of the ram 1 moves forward to push the material into the forming hole 13 and perform heading forming.
The product a is ejected from the die 6 by the advancement of the die 6.

In this embodiment, since a plurality of spacers 9 are arranged to surround the die 6, the expansion of the spacers 9 uniformly presses the die 6 over the entire circumference l and fixes it concentrically within the device hole γ. Additionally, there is an advantage that distortion is less likely to occur even if the die 6 is made thin.

As specifically explained in the above embodiment, the die fixing device of the heading machine of the present invention has a device hole formed in the die block fixed to the frame opposite to the reciprocating ram, and When the dies facing the punch attached to the ram are fitted, a pair of spacers made of a material with a large coefficient of thermal expansion are interposed between the outer periphery of the dies and the inner periphery of the device hole, and each spacer is The gist is that a heater is embedded, the pair of spacers are heated by the heater I, and the outer periphery of the die is pressed by the thermal expansion and fixed in the device hole, There are no movable parts for tightening screws, etc., making it extremely easy to attach, detach, and fix the die, and by arranging multiple spacers around the die, it is possible to eliminate irregularities in the outer diameter of the die. The punches can also be fixed in concentric positions at all times, which has the effect of preventing punch breakage accidents and improving heading accuracy.

[Brief explanation of drawings]

The accompanying drawings show an embodiment of the present invention, and FIG. 1 is a front view;
FIG. 2 is a sectional view taken along the line A--A in FIG. 1. 1: Ram, 2: Frame, 4: Dice block, 6: Dice, 7: Device hole, 9 Varnish spacer, 10: Heater, 15
:punch.

Claims (1)

[Claims] 1. Forming a device hole in a die block fixed to a frame facing the reciprocating ram, and fitting a die facing the punch attached to the ram into the device hole,
A spacer made of a material with a large coefficient of thermal expansion is interposed between the outer periphery of the die and the inner periphery of the device hole, and a heater is embedded in each spacer, and the spacer is heated by the heater and the spacer is heated by the thermal expansion. A die fixing device for a heading machine, characterized in that the die is fixed in the device hole by pressing the outer periphery of the die.