JPS60170Y2 - Die block for indirect extrusion - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tie-floc for indirect extrusion of metal billets such as aluminum.

Conventionally, indirect extrusion of metal billets differs from direct extrusion in that there is no friction between the metal billet and the billet loading hole in the container that holds it, so the extrusion process, especially the generation of frictional heat, has been made easier. Moreover, there is no risk of creating a confusing flow of metal within the billet, and the pressing force is not related to the length of the billet, so it has the advantage of being able to extrude a large billet with a small force. Therefore, it is widely used.

However, on the other hand, there is a risk that oxides, segregation layers, and other impurities in the billet skin may be extruded onto the surface of the shape as part of the product, or they may be rolled into the product, reducing the quality of the product. have shortcomings.

Measures to prevent this include, for example, cutting and removing the skin of the billet by machining before extrusion molding, or attaching the skin of the billet to the inner wall surface of the billet loading hole of the container during extrusion molding. Let me,
A method has been proposed for extruding high-quality partial bamboo products.

However, the former must be machined;
The latter method removes the billet skin attached to the inner wall of the billet loading hole by inserting a clean-out disk with the same diameter as the billet loading hole after extrusion and before feeding the billet into the billet loading hole. Both methods require a special step in the extrusion process and have the disadvantage of poor operating rates.

Furthermore, in the latter method, the removed billet skin wraps around the clean-out disk in a cylindrical shape, and it takes time and effort to remove it from the clean-out disk.

Therefore, there is a proposal to divide the billet skin part within the clean-out disk using dividing protrusions provided on the surface of the clean-out disk, making it easier to remove the billet skin (1973-
19866), this method still requires the above-mentioned special step of inserting a disk in the extrusion step.

In view of the above problems, when extruding a billet into a predetermined shape, a clearance is created between the die block and the inner wall of the container due to the pressure during extrusion, the billet skin is left on the inner wall of the container, and after extrusion is completed, A die block has been developed in which the billet skin remaining on the inner wall of the container is scraped out by a ridge provided on the outer periphery of the tip of the tie block when the die block returns to the container. It is characterized in that one or more grooves are formed at the corner of the rear surface of the protruding ridge of the die block.

That is, in the present invention, when scraping out the billet skin that has adhered to the inner wall of the container using the ridge of the dive recess, the billet skin at the end and inner part of the groove provided in the ridge is removed, as will be described later. The billet skin is divided into a plurality of plate shapes by utilizing the time difference in contact with the die block, which facilitates their removal from the die block.

To explain the present invention in more detail with reference to the drawings, FIG. 1 shows an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA, and FIG. 3 is a sectional view taken along line BB. 1 is attached to the tip of a hollow stem 2, and holds a die 3, a tie backer 4, and a bolster 5 inside.

A protruding ridge 6 is provided around the circumference at the tip of the die block 1, and four grooves 7 are formed at the corners of the rear surface of the protruding ridge 6.

The number of grooves 7 can be increased or decreased as appropriate depending on the size of the billet.

Fig. 4 and Fig. 5 are explanatory diagrams of the state of use.
The figure shows the extrusion process, where billet B (
(indicated by the dashed line), and insert the hollow stem 2 described above into this.
The tie block 1 at the tip is applied, the container 8 is moved in the direction of the arrow, and the die 3 forms the mold material ~1.

At this time, due to the pressure during extrusion, a clearance is created between the outer periphery of the ridge 6 of the tie block 1 and the inner wall of the container 8, and the billet skin 9 is left there in the form of a thin skin.

Figure 5 shows a state in which the container 8 is moving in the direction of the arrow to charge the next billet B after extrusion has finished, but at this time, high pressure is not built up as during extrusion. The outer periphery of the protruding ridge 6 and the inner wall of the container 8 are in close contact with each other, and the billet skin part 9 adhering to the inner wall of the container 8 is scraped out using the protruding ridge 6.

At this time, as shown in FIG.
When the billet skin part 9 is scraped out, the groove 7
There is a time difference in the way of contact between the end X and the inner part Y of state, and eventually split into four.

Therefore, removal of the billet skin portion 9 from the surface of the die block 1 becomes extremely easy.

The present invention is as described above, and allows the removal of the skin portion of a billet to be carried out in a normal extrusion molding process and to be carried out extremely easily, which is useful for improving productivity.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the present invention; Fig. 2 is a sectional view taken along line AA; Fig. 3 is a sectional view taken along line BB; FIG. 5 similarly shows the billet insertion process, and FIG. 6 shows an explanatory view of its operation. 1...Dive hook, 2...Hollow stem, 3...Die, 4...Tie packer
5... Bolster 6... Ridge, 7...
... Groove, 8 ... Container 9 ... Billet skin part, B ----- Billet, M ...
・Form material.

Claims (1)

[Scope of utility model registration request] When extruding the billet into a predetermined shape, a clearance is created between the die lock and the inner wall of the container due to the pressure during extrusion, the billet skin remains on the inner wall of the container, and after extrusion is completed, the billet is returned to the die block or inside the container. In this case, in a die block that scrapes out the billet skin remaining on the inner wall of the container by a protruding ridge provided on the outer periphery of the tip of the die block, one or more pieces are attached to the rear corner of the ridge. A dive jig for indirect extrusion, characterized by having grooves formed therein.