JPH0248325B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to peripheral walls such as those used in architectural structural materials such as window sashes of buildings and industrial machine parts such as cylinder barrel materials of rodless cylinders. The present invention relates to an extrusion die for producing extruded shapes of aluminum, plastic, etc., which has a tongue portion (opening) along the longitudinal direction in a part thereof, and particularly relates to an extrusion die for extruding shapes having a high tongue ratio.

2. Description of the Related Art Extruded shapes having tongue portions as described above are generally manufactured by extrusion molding using a porthole die consisting of a combination of a female die and a male die. Conventionally, such porthole dies for manufacturing extruded shapes have been designed to fill part of the annular molding gap formed between the male and female bearing parts with small protrusions protruding from the male bearing part. As a closure, the small protrusions form a tongue portion on a part of the peripheral wall of the hollow profile that is molded in accordance with the molding gap.

Problems to be Solved by the Invention However, the above-mentioned porthole die is particularly suited for extruded sections with a high tongue ratio, that is, the ratio of the internal hollow part of the section to the tongue section, in other words, extruded sections with a relatively small tongue section. When manufacturing shaped materials, the male die tends to bend due to extrusion of material under high pressure, or the small protrusions of the male die that form the tongue portions in the extruded material tend to bend or deform. Due to this, repeated use may create a slight gap between the small protrusion and the inner surface of the female mold with which it is supposed to be in close contact. For this reason, the extruded material gets into the gap, causing thin protruding scratches called burrs on the side edges of the tongue part of the extruded shape, which not only deteriorates molding accuracy but also There were some drawbacks such as the need for finishing work to remove the burrs mentioned above.

In addition, the above-mentioned porthole die, which has small protrusions that close part of the molding gap, requires a high degree of processing precision, especially since the small protrusions must be able to come into close contact with the female die. However, the drawback was that it was difficult to manufacture. Furthermore, if the small protrusion and the female die were placed too tightly together, the pressure during extrusion would cause undue stress to be applied between them, which could lead to breakage.

On the other hand, in order to reduce or eliminate the above-mentioned drawbacks related to dies and make it possible to manufacture a profile with a high tongue ratio, it is possible to extrude the profile once into a profile with a small tongue ratio and then convert this profile into a regular shape. Some methods include shaping the material, or simultaneously integrally molding an imitation part through a temporary joint at the site where the tongue part is to be formed, and then cutting off the temporary joint after extrusion to form the tongue part. Both required processing after extrusion and were inferior in productivity.
Moreover, when an imitation part is provided, there is also the problem that burrs are likely to occur at the separated part of the temporary joint part.

The present invention solves the above-mentioned drawbacks, and makes it possible to efficiently produce a semi-hollow extruded shape having a high tongue ratio as a high-quality, high-precision product without burrs, and it also has the same high precision as the conventional method. The object of the present invention is to provide a die that does not require extensive processing and has a low risk of breakage.

Means for Solving the Problems In order to achieve the above object, the die for extruding a profile having a high tongue ratio according to the present invention basically uses a porthole die consisting of a combination of male and female types as in the past. Referring to the reference numerals in the drawings, this die is for extruding a profile having a tongue part b extending along the length of a part of the peripheral wall a, and is a female porthole die 1 and the same male type. 2, the female die 1 is integrally provided with a protruding piece 17 for forming a tongue portion having a wall thickness smaller than the width of the molding convex portion 21 of the male die 2, while the male die 2 is A notch-like recess 24 is provided at the tongue part forming position of the molding convex part 21, and the protruding piece 17 of the female die 1 is disposed with its tip part fitted into the recess 24 of the male die.
The projecting piece 17 is arranged in such a manner that it traverses the annular molding gap 3 formed between the bearing parts 15 and 23 of the male and female molds 1 and 2, and closes a part of the molding gap with the middle part of the protruding piece 17 in the height direction. Furthermore, a gap 4 having a length (l) of 1.0 mm or less is formed between the opposing surfaces 17a and 24a of the protruding piece 17 of the female die 1 and the recess 24 of the male die 2 in the extrusion direction. It is characterized by the fact that

Function The molding material in the extruder container is extruded from the annular molding gap 3 formed between the bearing parts 15 and 23 of the male and female dies 1 and 2, but a part of the molding material crosses the molding gap. Since the protruding piece 17 of the female mold 1 is arranged in a closed state, the extruded shape member X having the tongue portion b on a part of the peripheral wall is continuously molded. During this extrusion, the protruding piece 17 is subjected to extrusion pressure, but the tip of the protruding piece is disposed in a fitted state in the recess 24 of the male die 2, and its tip face is connected to the male bearing part 2.
3, since they protrude relatively in the axial direction of the die, a gap may occur between the male bearing part 23 and the tip surface of the female protrusion piece 17 even after repeated use. Therefore, the occurrence of burrs on the shape material is suppressed. Furthermore, the protruding piece 1
Not only does it become unnecessary to bring the tip end surface of the protruding piece 1 into close contact with the male bearing part 23, but also the protruding piece 1
Opposing surface 17 between 7 and the recess 24 in the extrusion direction
Coupled with the fact that the gap 4 is provided between a and 24a, high precision die machining is not required. Moreover, due to the existence of this gap 4, even if pressure in the extrusion direction is applied to the molding convex part 21 of the male mold during extrusion, the molding convex part 21 and the female mold protruding piece 17 come into contact, causing unreasonable stress and causing the protruding piece There is no danger of damage to the 17th mag. However, if the gap 4 is too wide, the molding material will enter this gap during extrusion, and the molding material will be transferred to the sides and bottom of the protruding piece 17 and the recess 24.
There is a danger that it will be pushed out through the gap with the wall and become a burr. Therefore, the length (l) of the gap 4 is specified to be 1.0 mm or less, thereby suppressing the molding material from entering the gap 4, and thereby reliably preventing the occurrence of burrs.

Embodiments Next, the configuration of the present invention will be explained based on illustrated embodiments.

The die A shown in FIGS. 1 to 5 has a tongue part b in a part of the peripheral wall a along the length direction, as shown in FIG. This is for manufacturing an extruded section X having a cross-section having a high ratio of .

The die A is composed of a female porthole die 1 and a male porthole die 2, as shown in FIG.

The female mold 1 has a protruding edge 12 for positioning on the periphery of the joint surface 11, has a concave inflow portion 13 into which the molding material flows in the center of the joint surface 11, and further has a concave inflow portion 13 at the center of the joint surface 11, into which the molding material flows. It has an extrusion hole 14 having a rectangular cross section that passes through the female die in the thickness direction.
The circumferential surface on the inlet side of the extrusion hole 14 serves as a bearing portion 15, and the circumferential surface on the outlet side serves as a relief portion 16 continuing from the bearing portion 15. Furthermore, in the female mold 1, on the inner circumferential surface of the extrusion hole 14, a thin protrusion piece 17 for forming a tongue part having a length ranging from a longitudinally intermediate position of the bearing part 15 to an intermediate position of the relief part 16 is provided. It is integrally formed to protrude in the axial direction. This protruding piece 17
The wall thickness is smaller than the width of the molding convex portion 21 of the male die 2, and is set equal to the length of the tongue portion b of the extruded section X as expected.

On the other hand, the male mold 2 has the molding convex portion 21 having a rectangular cross section in the center thereof, and the convex portion 21
It has a plurality of introduction holes 22 for introducing molding material at positions around the . and the molded convex portion 2
The bearing part 15 of the female mold 2 is disposed on the circumferential surface of the distal end of the mold 1.
A bearing portion 23 is formed to face each other on the inside. Furthermore, on the upper edge of the tip of the molding convex part 21, a notch-shaped narrow recess 24 of a predetermined depth that is fitted with the protruding piece 17 of the female die 1 is provided at a position corresponding to the tongue part in the middle part in the width direction. It is formed over the length from the end surface of 21 to the middle of bearing part 23.

The female mold 1 and the male mold 2 are oriented so that the protruding piece 17 of the female mold and the recess 24 of the male mold match, and a positioning tool is provided on the periphery of the joint surface 25 of the male mold 2. The stepped portion 26 is fitted into the edge portion 12 of the female die 1 to form a die. In such a combination state, the male type 2
The tip of the molding convex part 21 faces the extrusion hole 14 of the female mold 1, and the male and female bearing parts 15, 23 are arranged oppositely through the annular molding gap 3,
The tip of the male die side of the protruding piece 17 of the female die 1 is positioned to fit into the recess 24 of the male die 2, so that the protruding piece 17 crosses the molding gap 3 and extends in the height direction. A part of the molding gap 3 is closed at the intermediate portion. Further, the protruding piece 17 of the female die 1 is arranged in a non-contact state in the recess 24 of the male die 2, and a gap is formed between the protruding piece 17 and the wall surface of the recess 24. There is. The reason why the gap is provided in this way is that the formed convex part 21 is deformed in the extrusion direction due to the existence of the gap 4 (shown in FIG. 5) between the protrusion piece 17 and the recess 24 in the extrusion direction. This is to prevent damage by preventing direct contact between the male mold and the protruding piece. Furthermore, since a gap is provided, there is no need to intentionally process the die with high precision. By forming the gap 4, the molding material such as aluminum enters the gap during extrusion and is pushed out in the extrusion direction from the gap between the side and bottom surfaces of the protruding piece 17 and the recess 24, thereby preventing burrs from forming on the shape. There was a concern that this would be more likely to occur, but it has been found that there is no problem at all if the length (l) of the gap 4 is 1.0 mm or less, and that this problem will occur if (l) exceeds 1.0 mm. . Therefore, the length (l) of the gap 4 must be set to a maximum of 1.0 mm.

In the die A, a metal molding material such as an aluminum billet or a plastic molding material heated in the container of the extruder flows into the introduction hole 22 of the male mold 2 under extrusion pressure. The molding material that has flowed into the introduction hole 22 passes through the inflow part 13 of the female mold 1 and once merges there, and is then extruded from the molding gap 3 between the bearing parts 15 and 23 of the male and female molds 1 and 2. However, since a part of the gap 3 is closed by the protruding piece 17,
It is molded into a semi-hollow extruded section X having a cross-section having a tongue portion b as shown in FIG. In this extrusion process, the protruding piece 17 of the female die 1 is subjected to extrusion pressure, but the tip of the protruding piece is disposed in a fitted state in the recess 24 of the male die 2, so that its tip surface is connected to the male bearing part. Since the projecting piece 17 relatively protrudes in the axial direction of the die beyond , no gap is generated between the male bearing part 23 and the tip end surface of the female protrusion piece 17.

Effects of the Invention As described above, in the die according to the present invention, the female die integrally includes a protruding piece for forming a tongue portion having a wall thickness smaller than the width of the molding convex portion of the male die;
The male die is provided with a notch-like recess at the position where the tongue portion of the molding convex portion is formed, and the protruding piece of the female die is disposed with its tip fitted into the recess of the male die, thereby making it possible to distinguish between male and female. The projecting piece is disposed in such a manner that it crosses an annular molding gap formed between the bearing parts of both types, and closes a part of the molding gap at the intermediate portion in the height direction of the projecting piece. Therefore, it is not only possible to manufacture an extruded shape having a tongue portion by simply extruding the molding material as it is through the die without requiring any subsequent processing, but also to produce a shape having a tongue portion in order to extrude a shape having a high tongue ratio. Even when the wall thickness of the piece is made relatively thin and used repeatedly, a gap is created between the male bearing part and the tip of the female protruding piece due to extrusion pressure, and the tongue part of the extruded shape is damaged. It is possible to avoid inconveniences such as those caused by burrs. As a result, it becomes possible to efficiently provide a high-precision, high-quality extruded shape having a high tongue ratio while eliminating the need for burr removal work. In addition, the thickness of the protruding piece is smaller than the width of the molded convex part, and the tip thereof is disposed in a fitted state in the male mold concave part.
The connecting edge in the width direction between the tip of the protruding piece and the molding convex part does not face the molding gap, so if the protruding piece and the molding convex part have the same width, one of them will be misaligned in the width direction during extrusion. As a result, the edges of protruding pieces and molding convex parts dig into the molding gap, reducing the thickness of the extruded material and reducing its strength, and causing unevenness on the inner surface of the extruded material, impairing its appearance quality. This will not cause any inconvenience. Furthermore, it is not necessary to bring the tip of the female protruding piece into close contact with the male bearing surface.
Moreover, since a gap is provided between the facing surfaces of the female protruding piece and the male concave part in the extrusion direction, the machining of the protruding piece tip and the concave part does not need to be performed with high precision, making it possible to manufacture dies. It is possible to simplify the process and reduce the manufacturing cost. Furthermore, the existence of the gap in the extrusion direction between the protruding piece and the recess means that even if a pressing force is applied to the male molded convex part in the extrusion direction and deforms it during extrusion, the deformation will not occur in the female mold protruding part. This has the effect of preventing or suppressing problems such as excessive stress occurring between the two and eventually causing breakage, and the die can be made with excellent durability. Furthermore, the length of the gap should be adjusted to prevent the molding material from entering the gap if the gap widens too much, and the risk of burrs being generated due to extrusion from the gap between the side or bottom of the protruding piece and the wall of the recess.
By regulating it to 1.0 mm or less, it can be reliably wiped out, making it possible to provide an extruded shape with a tongue part that does not generate burrs at all. Incidentally, using the dies shown in Figures 1 to 5, calculate the length (l) of the gap between the opposing surfaces of the female protruding piece and the male recess in the extrusion direction.
When A6063Al alloy was extruded into the shape shown in Figure 6 under the same dimensions and extrusion conditions except for the four types of 0.5 mm, 0.8 mm, 1.0 mm, and 1.2 mm, the gap was
While no burrs were observed with the 0.5, 0.8, and 1.0 mm dies, burrs were observed on the lower edge of the tongue of the extruded section with the 1.2 mm gap die.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing a female die and a male die separated; FIG. 2 is an enlarged perspective view showing a protruding piece of the female die and a recess of the male die separated; Fig. 3 is a vertical sectional view of the main part of the die, Fig. 4 is a sectional view along the line of Fig. 3, and Fig. 5 is an enlarged view of the main part of Fig. 3.
FIG. 6 is a sectional view of an extruded section having a tongue portion manufactured by the die shown in FIGS. 1 to 5. A...Dice, X...Extruded section, a...Peripheral wall, b...Tong part, 1...Female mold, 15...Bearing part, 17...
Projecting piece, 2...Male type, 23...Bearing part, 24...
Recessed portion, 3...molding gap, 4... gap.

Claims (1)

[Claims] 1. A die for extruding a profile having a tongue part b along the length direction in a part of the peripheral wall a, which is composed of a combination of a female porthole die 1 and a male porthole die 2, in which the female die 1 is integrally provided with a protruding piece 17 for forming a tongue portion having a wall thickness smaller than the width of the molding convex portion 21 of the male die 2, while the male die 2 has a notch-shaped cutout at the tongue portion forming position of the molding convex portion 21. The protruding piece 17 of the female die 1 is provided with a recess 24 and its tip is placed in the recess 24 of the male die, so that the bearing parts 15 and 23 of both the male and female dies 1 and 2 are fitted. The projecting piece 17 is arranged in such a manner that it crosses an annular molding gap 3 formed in the molding gap 3 and closes a part of the molding gap at the middle part in the height direction of the protruding piece 17. Piece 17
A shape having a high tongue ratio, characterized in that a gap 4 having a length (l) of 1.0 mm or less is formed between opposing surfaces 17a and 24a in the extrusion direction of the recess 24 of the male die 2. Dies for extruding materials.