JP3643262B2 - Extrusion processing method using die shift and apparatus therefor - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a material flow control flexible extrusion technology for manufacturing a product having various shapes and dimensions under the optimal tool and processing conditions by controlling a processing machine by a computer, and in particular, provided at an extrusion port. The present invention relates to an extrusion processing method and apparatus capable of arranging a die in a plan view so as to be shifted back and forth in the extrusion direction and thereby bending the extrusion material such as resin or metal.
[0002]
[Prior art]
In recent years, in the manufacturing industry, as price competition has intensified, improvement of production technology or development of new technology for providing products at lower cost has been actively carried out. Under such circumstances, flexible processing, in which the processing machine is controlled by a computer and products with various shapes are manufactured under the optimal tools and processing conditions, reduces the number of manufacturing processes, reduces mold costs, It has many advantages such as reduction, and is attracting attention as an extremely powerful method for promoting cost reduction.
[0003]
Extrusion has been frequently used as a general-purpose technique for producing a long material having a uniform cross-sectional shape such as a resin or a metal material. There are a wide variety of products manufactured by extrusion, and it has also been applied to the manufacture of special products with uniform twist, such as drills. However, recently, from the viewpoint of reducing the weight of products or optimizing the product shape, there has been a movement to manufacture products with cross-sectional dimensions and shapes changed at each position in the longitudinal direction. The need for the development of processing technology has been strongly recognized.
[0004]
Normally, the extruded material is supplied without bending in the longitudinal direction of the product. However, a change in the cross-sectional shape in the longitudinal direction changes the material flow during extrusion, causing the product after extrusion to bend. The bending of the product is a major factor that lowers the product accuracy, and the development of a technology for solving it is an extremely important issue.
On the other hand, the member manufactured by extrusion is supplied to the user as a final product after secondary processing such as bending into an appropriate shape. If the shape to be applied to the member by secondary processing such as bending can be obtained immediately by the extrusion processing, the secondary processing applied to the member can be omitted, leading to a significant cost reduction. Conceivable.
[0005]
[Problems to be solved by the invention]
Therefore, in order to make the extrusion process flexible, it is indispensable to establish a technology to control the material flow and control the bending, and as a result of diligent research on the extrusion method, the present inventor has conducted research on the die placed at the extrusion port. Succeeded in developing technology related to the extrusion method that can freely control the bending applied to the extruded material depending on the arrangement.
The present invention has been made on the basis of the above knowledge, and is characterized in that the two dies forming the die hole are arranged so as to be shifted back and forth when viewed from the plane of the extrusion direction. It is an object of the present invention to provide an extrusion processing method using a die shift method capable of imparting bending and an apparatus therefor, and to solve the above problems.
[0006]
[Means for Solving the Problems]
For this reason, the technical means adopted by the present invention are:
A material passage is formed by the first member and the second member constituting the container, and dies are respectively attached to the first member and the second member of the extrusion port of the material passage so as to protrude into the extrusion port. The two dies are attached so that the opposite sides of the two dies are parallel to each other when viewed from the front of the extrusion port, and the two dies are shifted back and forth with respect to the extrusion direction in plan view of the extrusion port, and the material is removed from the extrusion port. It is an extrusion method using a die shift characterized in that bending is generated in the material by extrusion .
Further, the first member and the second member constituting the container, the material passage formed by the first member and the second member, and the extrusion passage opening of the material passage so as to protrude into the extrusion opening. A die is attached to the first member and the second member, and the dice are attached back and forth with respect to the extrusion direction in a plan view of the extrusion port so that opposing sides of the die are parallel when viewed from the front of the extrusion port. This is an extrusion processing apparatus using a die shift characterized by the above.
Further, the extrusion processing apparatus is characterized in that the front-rear shift of the die in the plan view can be freely controlled.
Further, in the front view, the extrusion processing apparatus is characterized in that a die protrusion amount with respect to the extrusion port can be freely controlled.
[0007]
Embodiment
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an extrusion device used for the die shift method according to the present embodiment, and FIG. FIG. 3 is a schematic configuration diagram of an extrusion machine using the apparatus.
In FIGS. 1 and 2, reference numeral 10 denotes a container constituting an extrusion device. The container 10 is adjacent to a first member 1 having a groove-like recess that forms a material extrusion passage 11, and the first member 1. And a second member 2 forming one side wall of the passage 11, and a material passage 11 is formed in the center of the container by these two members, and a material extrusion port 12 is formed at the end of the passage 11. Is formed. The first and second members 1 and 2 are detachably integrated by fixing means 8 such as bolts.
[0008]
As shown in the figure, the first member 1 and the second member 2 are arranged so as to be displaced from each other in the forward and backward directions with respect to the extrusion direction. In the above embodiment, the first and second members 1 and 2 are configured as separate members. For example, by combining other members having appropriate shapes, an extrusion passage and an extrusion port as shown in FIG. It is also possible to form. It should be noted that the displacement of the first and second members 1 and 2 before and after can be changed as necessary. In this case, an actuator or the like (not shown) can be used as a means for changing the displacement. .
[0009]
The dies 5 and 6 are attached to the extrusion port 12 made of the first member and the second member by a fixing means 7 such as a bolt. In the present embodiment, these dies 5 and 6 are arranged so as to be shifted back and forth by h in a plan view as shown in FIG. Further, the dies 5 and 6 are arranged with a predetermined protrusion amount W with respect to the extrusion port. However, the protrusion amount W (see FIG. 1) can be automatically controlled by means such as an actuator (not shown). Further, depending on the product shape, the left and right protrusion amounts can be different.
[0010]
As shown in FIG. 3, the extrusion device (container) 10 is fixed on a table 21, 21 installed on a bed 20, and a punch 22 for extruding a material (billet) 9 thrown into the extrusion device 10. Is prepared, and the punch 22 can be pushed downward through the cross head 23 in the figure.
[0011]
A method of processing a bent product using the extrusion device (container) 10 configured as described above will be described.
The extrusion device 10 is assembled as shown in FIG. 1 and installed in the extrusion machine as described above. When the material (billet) 9 is extruded from the extrusion device 10 using the punch 22, the material 9 includes As shown in FIG. 2, bending is given by the action of the dies 5 and 6 that are displaced back and forth in the extrusion direction, and a bent product can be easily obtained. In addition, it becomes possible to manufacture various types of bent products by freely adjusting the protruding amount W of the displaced dies 5 and 6 with respect to the extrusion opening and the front and rear displacement amount h as necessary. Further, a lubricant is appropriately applied to the contact surface between the container and the die and the material.
[0012]
FIG. 4 shows the relationship between the curvature and the shift amount (step), and FIG. 5 shows the relationship between the curvature and the extrusion ratio. From these figures, it can be seen that a predetermined curvature can be generated by shifting the two dies 5 and 6 back and forth, and that the curvature increases as each extrusion ratio increases. The materials used in this experiment, the dimensions of the passages, etc. are as follows.
Material: Plasticine (often used as an experimental model)
Passage dimension: 18 x 18 (mm)
Die thickness: 3 (mm)
Lubrication method: Apply soapy water to the container and the contact surface between the die and the material.
As described above, in the extrusion processing method and apparatus of the present invention, the product can be bent by a simple method of shifting the die back and forth with respect to the extrusion direction at the extrusion port, and the protrusion amount of the die and the deviation of the die can be provided. Various bending states can be controlled by controlling the amount (step) or the like. In the above example, the amount of die displacement is kept constant during extrusion, but the bending state can be controlled by changing the amount of die displacement and protrusion using an actuator during product processing. It is. In addition, the present invention can be implemented in any other form without departing from the spirit or main features thereof. Therefore, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner.
[0014]
【The invention's effect】
As described in detail above, according to the present invention, a predetermined bend is applied to the extruded material at the time of extrusion by an extremely simple device in which two dies forming a die hole are arranged to be shifted back and forth with respect to the extrusion direction. Can be granted. Further, the bent state can be easily controlled, and a final product that does not require secondary processing can be obtained. In addition, since the secondary processing can be omitted, the cost of the product can be significantly reduced. Furthermore, the die shift method can exhibit excellent effects such as being effective for a method of controlling the lateral bending in the thickness direction.
[Brief description of the drawings]
FIG. 1 is a perspective view of an extrusion device used in a die shift method according to an embodiment.
FIGS. 2A and 2B are a plan view and a front view showing a state in which a material is extruded by the extrusion device.
FIG. 3 is a schematic explanatory view of an extrusion machine using the extrusion apparatus according to the present embodiment.
FIG. 4 is a graph showing the relationship between curvature and deviation (step).
FIG. 5 is a graph showing the relationship between curvature and extrusion ratio.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st member 2 2nd member 5, 6 Dies 7, 8 Fixing means 9 Material (billet)
10 Container (Extruder)
11 Passage 12 Extrusion port

Claims (4)

A material passage is formed by the first member and the second member constituting the container, and dies are respectively attached to the first member and the second member of the extrusion port of the material passage so as to protrude into the extrusion port. The two dies are mounted so that the opposite sides of the two dies are parallel to each other when viewed from the front of the extrusion port, and the two dies are shifted back and forth with respect to the extrusion direction in plan view of the extrusion port, and the material is removed from the extrusion port. Extrusion method using a die shift, characterized by bending the material by extruding. The first member and the second member constituting the container, the material passage formed by the first member and the second member, and the first passage so as to protrude into the extrusion port at the extrusion port of the material passage. A die is attached to the member and the second member, and the dice are attached back and forth so that the opposing sides of the die are parallel to each other when viewed from the front of the extrusion port, and in the plan view of the extrusion port. Extrusion processing equipment using a die shift characterized by The extrusion processing apparatus according to claim 2, wherein a front-rear shift of the die in the plan view can be freely controlled. The extrusion processing apparatus according to claim 2 or 3, wherein a die protrusion amount with respect to the extrusion port can be freely controlled in the front view.

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