JPS5942151A - Die fixing device of warm heading machine - Google Patents

Abstract

PURPOSE:To fix a die concentrically to the fitting hole even when the outer diameter of the die is not uniform by pressing the outer periphery of the die by thermal expansion and fixing it to the fitting hole. CONSTITUTION:Mutually corresponding two and four pieces of fitting grooves 8 are formed and spaced at 90 deg.. Spacers 9 made of metals having different coefficient of thermal expansion are fitted to the fitting grooves 8, and a heater 10 and a temperature sensor are fixed into each spacer. The die 6 is made slightly to have a smaller diameter than the inner diameter of the fitting hole 7 and inserted loosely into the hole, and the spacers 9 are heated by conducting heaters 10. Distance between the spacers 9 is narrowed by thermal expansion, and the die 6 is pressed toward the center and fixed firmly.

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.

(In heading machines such as 1c, headers, and homers, a device hole is formed in a die block fixed to a frame opposite to a reciprocating ram, and a die with a forming hole of a shape corresponding to the product to be forged is used. 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 the - side. , it may not match the axis of the punch, reducing machining accuracy, or it may break due to a lateral load acting on the shaft when pressing the spherical head of element A2 with a punch for forming a cross. It is necessary to precisely match the outer diameter of the die to the device hole, but it is difficult to machine the outer diameter of many dies to a constant size, and Structurally, it is impossible to press from one direction with a screw or the like to align and fix.

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 FM attached to a mounting 7F+) 3 formed on the frame 2 facing the reciprocating ram 1, and a shearing die 5 is fitted on the negative side thereof, and a heading die 6 is fitted on the other side. There is.

Four pairs of fitting grooves 8 are formed at 90 degree intervals, and each fitting groove 8
A spacer 9 made of a metal having a high coefficient of thermal expansion, such as copper, is fitted almost tightly into the spacer 9, and a cartridge-type heater 10 and a temperature sensor (not shown) are embedded in each spacer 9. It is connected to a temperature control device (not shown) by a lead wire 12 passed through a pore 11 formed in the pore 11 .

Then, after forming the die 6 to be slightly smaller than the inner diameter of the device hole 7 and loosely fitting it into the die 6, when electricity is applied to the heater 10 and the spacer 9 is heated, the V spacers 9 correspond to each other due to thermal expansion. The interval is narrowed and the dice 6 are 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 heading machine, it is also possible to control the temperature of the heater 10 using a temperature control device for heating the material.

Furthermore, an ejection 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 the material is cut into a certain length by a cutter (not shown) in the shearing die 5. When the ram 1 is transferred to the front side of the forging die 6, it is pushed into the forming hole 13 by the punch 15 attached to its tip by reversing the ram 1, and after being subjected to heading forming, the ejector pin 14 advances. The finished product a is ejected from 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, and fixes the die 6 concentrically within the device hole 7. , there is an advantage that even if the die 6 is made thin, no distortion occurs.

As specifically explained in the above embodiment, the die fixing device for a heading machine of the present invention has a device hole formed in a die block fixed to a frame opposite to a reciprocating ram, and a At the same time, a spacer made of a material with a large coefficient of thermal expansion is inserted between the outer periphery of the die and the inner periphery of the device hole, and a heater is attached to each Nubesa. The heater heats the pair of spacers, and the thermal expansion presses the outer periphery of one of the dies and fixes them in the device hole. There are no movable fasteners, such as those that have no parts, making it extremely easy to remove and fix the die, and by arranging multiple spacers around the die, it is possible to prevent irregularities in the outer diameter of the die. can always be fixed in a concentric position, which has the effect of preventing punch breakage accidents and improving heading accuracy.

[Brief explanation of the drawing]

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: Spacer 10: Heater 15:
punch

Claims (1)

[Claims] A device hole is formed in the die block fixed to the frame facing the reciprocating ram, and a die facing the punch attached to the ram is fitted into the device hole.
, a Nuveza made of a material with a large coefficient of thermal expansion is interposed between the outer circumference of the die and the inner circumference of the device hole, a heater is embedded in each Nuveza, and the Nuveza is heated by the peak to cause its thermal expansion. (From iii) A tie fixing device for a pressed material, characterized in that it has a 111,7 structure that presses the outer periphery of the die and fixes it in the device hole C, n11.ff'7