JP3741996B2 - Extrusion die apparatus, die holding die member used in the apparatus, and die holding method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an extrusion die apparatus used for extrusion molding of aluminum or the like, a die member for die holding used in the apparatus, and a die holding method.
[0002]
[Prior art]
Generally, in an extrusion die apparatus, a structure in which, for example, a flat die is fitted and held in a die hold hole formed in a shaft core of a die hold die member is employed. Since a high extrusion pressure by a high-temperature molding material is energized, it is necessary to take measures to prevent distortion deformation in the die.
[0003]
In general, die holding deformation can be controlled by increasing the outer diameter of the die-holding die member and the thickness in the extrusion direction, or by supporting the outer periphery of the die-holding die member with a special jig. Although it has been devised to hold down on the mold member side, there is a problem that the whole is enlarged or a special jig has to be prepared.
[0004]
For this reason, recently, as shown in FIG. 9, the die 102 is fastened and fixed to the die hold hole 103 of the die holding die member 101 by shrink fitting or the die hold as shown in FIG. The inner peripheral surface 103a of the hole 103 and the outer peripheral surface 102a of the die 102 are configured with inclined surfaces that increase in diameter as they reach the downstream side in the extrusion direction, and the die 102 is press-fitted from the downstream side of the die hold hole 101a. Fixing technology has been developed.
[0005]
[Problems to be solved by the invention]
However, in such a conventional technique, high accuracy is required for the fitting dimensions of the die hold hole 101a and the die 102, and it is difficult to remove the die 102, which makes maintenance difficult. In particular, due to the difference in heating temperature between the die 102 and the die-holding mold member 101 during molding, the difference in thermal expansion between the two dies 102 and 102 is large. Since it is difficult to absorb the holding mold 101 sufficiently, the distortion deformation of the die 102 cannot be effectively suppressed.
[0006]
The present invention has been made in view of the above circumstances, and provides an extrusion die apparatus that can suppress distortion deformation of a die as much as possible and that is excellent in maintainability, a die member for a die hold used in the apparatus, and a die holding method. The issue is to provide.
[0007]
[Means for Solving the Problems]
The above-mentioned problem is provided with a die-holding die member in which a die-hold hole penetrating in the extrusion direction of the molding material is formed in the shaft core, and a die fitted and held in the die-hold hole. This is solved by an extrusion die apparatus characterized in that a recess filled with a molding material is formed on the inner peripheral surface of the hole continuously or intermittently around the entire axis.
[0008]
According to this extrusion die apparatus, a die is fitted into a die hold hole of a die hold die member, and the molding material is filled in the recess as the molding is carried out. It is in a state of being substantially surrounded by
[0009]
For this reason, the temperature on the die holding die member side rises to the same as the heating temperature on the die side by the molding material filled in the recess, and the difference in thermal expansion between the die and the die holding die member is small. In addition, the pressure outward in the radial direction of the die due to thermal expansion is absorbed by the molding material of the recess. Accordingly, it is not necessary to strictly require the fitting accuracy between the die and the die hold hole, and the distortion deformation of the die is effectively suppressed, and the quality of the molded product can be improved.
[0010]
Further, after the molding, the die can be removed immediately from the die hold hole, so that maintenance can be easily performed.
[0011]
In addition, in the die-holding die member in which the die-holding hole penetrating in the extrusion direction of the molding material is formed in the shaft core, the above-described problem is a recess in which the molding material is filled on the inner peripheral surface of the die-holding hole. Is also solved by a die-holding die member characterized in that it is formed continuously or intermittently around the entire axis.
[0012]
In this die-holding die member, when various types of dies are fitted into the die-holding holes, the molding material is filled in the recesses, and the temperature difference from the dies is reduced, resulting in the thermal expansion of the dies. The pressure is absorbed by the molding material in the recess, and the deformation of the die is suppressed.
[0013]
And a step of continuously or partially forming a recess filled with the molding material on the inner peripheral surface of the die hold hole formed in the shaft core of the die hold die member around the shaft core. And a die holding method comprising: a step of fitting a die into the die hold hole; and a step of filling the concave portion with a molding material in a state where the die is fitted into the die hold hole. Solved.
[0014]
In this die holding method, if molding is performed in the normal procedure, the molding material is filled in the concave portion, the heating temperature difference between the die and the die for holding the die is reduced, and deformation of the die during molding is suppressed. Therefore, proper molding can be performed.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0016]
In the embodiment described below, a solid material to be subjected to extrusion processing is a bar N having a circular cross section made of aluminum as shown in FIG.
[0017]
Note that the bar N to be extruded by the extrusion die apparatus is not limited to the cross-sectional shape and application, and the material of the bar N is not limited to aluminum, and is suitable for other extrusion molding. Various metals may be used. Also, the die is not limited to the single extrusion type, and may be a multiple extrusion type.
[0018]
FIG. 1 is a cross-sectional view showing an entire extrusion die apparatus according to an embodiment of the present invention.
[0019]
In FIG. 1, 1 is a die, 2 is a die holding die member, 3 is a flow control die member, and 4 is a backer.
[0020]
The die 1 is for forming the rod-shaped material N, and is formed into a disk shape using a steel material or the like. The shaft core, which is the central portion in the radial direction, has a rear surface in the extrusion direction (arrow a direction). (Also referred to as the upstream side surface) 1a of a molding material extrusion path 11a formed in a tapered shape from the front, and a cylindrical shape extending to the downstream end of the molding material extrusion path 11a and reaching the front surface (also referred to as the downstream side surface) 1b A molding hole 11b is formed. An annular step 12 is formed on the outer peripheral edge of the rear surface 1a of the die 1.
[0021]
The die-holding die member 2 holds the die 1 and is formed in a disk shape using a steel material such as die steel. As shown in FIG. A die hold hole 21 having a circular cross-sectional shape penetrating in the direction is formed.
[0022]
An annular positioning step portion 22 protruding inward in the radial direction is integrally formed at the upstream opening end of the inner peripheral surface of the die hold hole 21, and the die 1 is inserted into the die hold hole 21 from the front. Then, the annular step portion 12 of the die 1 is brought into contact with the positioning step portion 22, and the die 1 is fitted and fixed in the positioning state in the die hold hole 21. By the contact between the step portions 22 and 12, a seal structure is established there, and leakage of the molding material (FIG. 5) M during extrusion is prevented.
[0023]
Further, as shown in FIG. 2, the inner peripheral surface of the die hold hole 21 is formed with a concave portion 23 that is opened inward in the radial direction in an annular shape around the axial center. If molding is performed in a state of being fitted in the hold hole 21, the molding material M is injected and filled.
[0024]
A plurality of injection holes 24 for injecting the molding material M into the recess 23 during extrusion are formed on the rear surface 2a of the die-holding mold member 2 corresponding to the recess 23, as shown in FIGS. Equally arranged in the circumferential direction. The injection hole 24 only needs to have a function of allowing the molding material M to easily enter the recess 23 during extrusion, and the number and shape thereof are arbitrary.
[0025]
In the hold state of the die 1, the front surface 1 b of the die 1 is set to be substantially flush with the front surface 2 b of the die holding mold member 2. An annular protrusion 25 is formed on the outer peripheral edge of the rear surface 2b of the die-holding mold member 2.
[0026]
The flow control mold member 3 is formed in a disc shape by a steel material such as die steel, and adjusts the flow of the molding material M supplied from a container (not shown) toward the molding hole 11b. As shown in FIG. 4, a material conduction hole 32 that distributes the molding material M on the upstream side of the die 1 is divided by a bridge 31 around the axis.
[0027]
An accommodation recess 31 corresponding to the rear surface 1a side of the die 1 is formed on the front surface 3b of the flow control mold member 3, and this flow control mold member 3 is connected to the die hold mold member 2. The rear surface 1a of the die 1 is positioned in a non-contact manner in a state of being combined on the upstream side.
[0028]
A fitting step 32 is formed on the outer peripheral edge of the front surface 3 a of the flow control mold member 3 over the entire circumference, and the front surface of the die holding mold member 2 is formed on the step 32. By fitting into the annular convex step portion 25 on the 2b side, both mold members 2 and 3 are coupled in a centered state.
[0029]
The backer 4 functions to support the combined body of the die 1 and the die-holding die member 2 from the front side while being in contact with the front surface of the holding-die member 2 by 2b. It is made of a steel material such as steel. The backer 4 is formed with a relief hole 41 that is larger in diameter than the molding hole 11b of the die 1 and increases in diameter toward the downstream side in the extrusion direction, concentrically with the molding hole 11b.
[0030]
The die 1 is positioned on the backer 4 by a knock pin 14 inserted into a knock pin insertion hole 13 formed on the front surface 1b side.
[0031]
In the die apparatus having the above-described configuration, the flow of the molding material M supplied from the container or the like with the start of molding is controlled by the flow control mold member 3, and then the material conduction in the flow control mold member 3 is performed. While being distributed by the holes 32, it is pushed into the die 1 and passes through the molding hole 11 b. Thereby, the solid material N according to the diameter of the forming hole 11b is formed.
[0032]
With the start of the molding, the high-temperature molding material M pushed from the upstream side of the die 1 is filled into the annular recess 23 through the injection hole 24 formed in the die 1 as shown in FIG. The entire circumference of the die 1 is surrounded by the molding material M.
[0033]
Since the high-temperature molding material M passes through the die 1, the die 1 heated to a temperature higher than that of the die-holding mold member 2 is thermally expanded to generate a radially outward pressure. However, when the concave portion 23 is filled with a high-temperature molding material M during molding, the molding material M in the concave portion 23 makes the temperature near the boundary with the die-holding mold member 2 equal to the temperature of the die 1. The difference in thermal expansion between the die 1 and the die-holding die member 2 is reduced. Further, the pressure outward in the radial direction of the die due to thermal expansion is absorbed by the molding material M surrounding the outer peripheral surface of the die 1.
[0034]
For this reason, it is not necessary to strictly manage the fitting accuracy between the die 1 and the die hold hole 21, and distortion deformation of the die 1 is effectively suppressed, and a molded product N having good shape quality can be obtained. In order to reduce the difference in thermal expansion, it is preferable to increase the length of the concave portion 23 in the axial direction as much as possible without impairing the mechanical strength of the die-holding mold member 2. Moreover, the cross-sectional shape and the like of the recess 23 can be arbitrarily changed.
[0035]
When the molding operation is completed, the die 1 is removed from the die-holding mold member 2 and both 1 and 2 are immersed in, for example, a caustic cleaning solution, thereby forming the molding hole 11b of the die 1 and the die-holding mold member. The molding material debris adhering to the recesses 23 and the like of 2 is removed, and it is possible to wait for reuse.
[0036]
After this molding, the molding material M is not present, and the die 1 can be removed from the die hold hole 21 immediately, so that the maintainability is excellent.
[0037]
The die is not limited to the flat extrusion die 1 of the above-described embodiment, but, for example, as shown in FIG. 7, a male die 5 having a mandrel 51 for forming a hollow portion of a hollow material (not shown), The present invention can be similarly applied to the port hole die 10 combined with the female die 6 having the molding hole 61 for loosely fitting the mandrel 51 with the molding gap G in order to mold the outer peripheral portion of the hollow material.
[0038]
That is, also in this case, the same effect as described above is exhibited by forming the recess 23 filled with the molding material M on the inner peripheral surface of the die hold hole 21 of the die hold die member 2.
[0039]
In each of the above-described embodiments, the concave portion 23 is described as an annular shape that continues to the entire circumference of the inner peripheral surface of the die hold hole 21 of the die hold die member 2. As shown, a plurality of recesses 23 may be provided at equal intervals in the circumferential direction.
[0040]
【The invention's effect】
As described above, according to the present invention, since the concave portion filled with the molding material is formed on the inner peripheral surface of the die hold hole in the die hold die member to which the die is fitted, the concave portion is formed in the concave portion during molding. The filled high-temperature molding material reduces the difference in thermal expansion between the die side and the die-holding die member side, and further, the pressure outward in the radial direction of the die due to thermal expansion is caused by the molding material in the recess. As a result of the absorption, high accuracy is not required for fitting between the die and the die hold hole, and distortion deformation of the die due to thermal influence can be effectively suppressed, and the molding quality can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an entire extrusion die apparatus according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view showing a die and a die holding die member in the same extrusion die apparatus.
FIG. 3 is a rear view showing a die holding die member.
FIG. 4 is a rear view showing a flow control mold member.
FIG. 5 is a cross-sectional view showing a main part during molding in the same extrusion die apparatus.
FIG. 6 is a cross-sectional view of a molded product.
FIG. 7 is a cross-sectional view showing an extrusion die apparatus using a port hole die.
FIG. 8 is a rear view of a die-holding mold member showing another example of forming a recess for filling a molding material.
FIG. 9 is an explanatory diagram of a conventional example.
FIG. 10 is an explanatory diagram of another conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,10 ... Die 2 ... Die-holding die member 21 ... Die-holding hole 23 ... Recess for filling molding material a ... Extrusion direction M ··· Molding material

Claims (3)

A die-holding die member in which a die-holding hole penetrating in the extrusion direction of the molding material is formed in the shaft core;
And a die fitted and held in the die hold hole,
An extrusion die apparatus, wherein a concave portion filled with a molding material is continuously or intermittently formed around the axis around the inner peripheral surface of the die hold hole. In a die-holding die member in which a die-holding hole penetrating in the extrusion direction of the molding material is formed in the shaft core,
A die-holding die member, wherein a concave portion filled with a molding material is continuously or intermittently formed on the inner peripheral surface of the die-holding hole all around the axis. A step of continuously or intermittently forming a recess filled with a molding material on the inner peripheral surface of the die hold hole formed in the axis of the die hold die member around the axis around the entire axis;
A step of fitting a die into the die hold hole;
Filling the concave portion with a molding material in a state in which a die is fitted into the die hold hole;
A die holding method characterized by comprising:

Images