JPS595446Y2 - Dies for aluminum extrusion - Google Patents

Description

[Detailed description of the invention] Conventional extrusion dies were discarded when the thickness of the extruded product became thick due to wear, especially at the bearing part.

Specifically, it was customary to discard the die when the wall thickness tolerance or the weight of the extruded product exceeded the allowable weight.

On the other hand, the cost of making an extrusion die is relatively high, and the number of days required for production is not short.As a die for regularly used shapes, it may reach the scrap limit or break during operation. At present, it is necessary to always have several dice on hand to take into consideration possible occurrences.

As mentioned above, the main purpose of this invention is to improve extrusion dies, which have traditionally had many problems in terms of cost and management. It provides dice that allow you to play.

Next, an embodiment of this invention shown in the drawings will be described.

FIG. 1 is a cross-sectional view showing an example in which this invention is applied to a flat die, which is a typical extrusion die. The billet 6 extruded by the tooth disk 5 reciprocating therethrough passes through the hole 9 containing the bearing section 8 of the diamond, and is extruded as a profile 12 toward the platen 11 containing the pressure ring 10. However, at this time, the diamond and the back die 13 behind it
are collectively supported by a die ring 14, and this die ring 14, as well as a bolster 15 and a dummy bolster 16 which are sequentially provided behind the back die 13, are supported by a die slide 17.

In this invention, a relatively narrow space 19 is formed in the joint surface 18 between the diamond and the back die 13 within a range including the hole 9 of the diamond and its surrounding area. For example, as a forming means of
, l), which is obtained by cutting the face 20 of the diamond with a width l and a depth d.

Further, in the case shown in FIGS. 3A and 3L, the surface 21 on the side of the back die 13 is cut with the width l and the depth d.

Next, what is shown in FIG. 4 a, l) is the face 20 of the diamond.
By welding two half-moon-shaped plates 22 and 23 to each other, a cavity 19 in the joint surface 18 is formed. In FIG. 5 a, l), the plates 22 and
23) An example of welding 24.25 is shown.

By using the die in which the cavity 19 is formed as described above, when the billet 6 is pressed against the bearing part 8 of the die during product (formation) extrusion, the die is initially placed in the hole part 9 including the bearing part 8. The billet 6 is deflected and deformed from the state shown by the solid line in FIG. 6 to the state shown by the imaginary line, and this deformation occurs in the direction in which the billet 6 is easily press-fitted into the bearing part 8, and this direction corresponds to the direction in which the product wall thickness becomes thinner. It is extremely effective in practice if the hole 9 is designed taking these points into consideration.

Moreover, if the void 19 is formed on the side of the back die 13, the P section (Fig. 7) will be crushed due to continued use, and the deformation of the diamond will further progress. Because the material is stretched by plastic deformation, the deformation caused by the use of the die always causes the product wall thickness to be on the negative side, thereby extending the life of the die.

In carrying out this invention, instead of forming the cavity 19 from the beginning, at the stage when the bearing part 8 has worn out to some extent, by means as shown in FIGS. 2 to 5, By forming the void space 19, it is possible to reuse the die that has been disposed of due to wear, so this embodiment can also significantly extend the life of the die compared to the conventional method. It is.

[Brief explanation of the drawing]

Figure 1 is a side sectional view showing this invention applied to a flat die, and Figures a and b in Figures 2 to 5, respectively.
6 are enlarged partial end views and side sectional views of four embodiments of this invention, and FIGS. 6 to 8 are enlarged sectional views showing the usage of the die of this invention. In the figure, 7...die, 8...
Bearing part, 9... Hole part, 13...
Back die, 18... Joint surface, 19...
...It's a blank space.

Claims (1)

[Scope of utility model registration request] 1. At the joint surface between the extrusion die and the back die provided in contact with the back of the die, a relatively narrow cavity is formed over an area including the hole of the die and its surrounding area, and this cavity is An aluminum extrusion die that is hollowed to form a relief to cause deflection in the extrusion direction mainly in the bearing part of the die when extruding a profile. 2. The die for aluminum extrusion according to claim 1, wherein the cavity is formed by a shallow groove formed in the surface of the die at the joint surface. 3. The die for aluminum extrusion according to claim 2, wherein the shallow groove provided on the surface of the die to form the void space is formed by cutting the surface of the die. 4. The die for aluminum extrusion according to claim 1, wherein the void space is formed by a shallow groove formed on the surface of the back die at the joint surface. 5. Aluminum extrusion according to claim 4, wherein the shallow groove provided on the surface of the back die to form the void space is formed by cutting force against the surface of the back die. dice. 6. A request for registration of a utility model in which the front cavity is formed by welding a plate to the surface of the die on the joining surface side, except for the area including the hole of the die and its surrounding area. The aluminum extrusion die according to item 1. 7. The die for aluminum extrusion according to claim 6, wherein the plate welded to the face of the die to form the cavity is formed by two half-moon shaped plates. 8. A claim for registration of a utility model in which the void space is formed by welding a plate to the back die surface on the joint surface side, except for the area including the hole portion of the die and its surrounding area. The aluminum extrusion die according to item 1. 9. The die for aluminum extrusion according to claim 8, wherein the plate welded to the surface of the back die to form the void space is formed by two half-moon shaped plates.