JP5635380B2 - Extrusion die apparatus and extrusion processing method - Google Patents

Description

  The present invention relates to an extrusion die apparatus and an extrusion method suitable for use in extruding flat multi-hole tubes and the like used for various aluminum heat exchangers, for example.

In producing various types of aluminum heat exchange tubes used in heat exchangers such as evaporators, condensers, and radiators, the extrusion method is widely used because the melting point of aluminum as a raw material is low.
For example, as shown in FIG. 8, an aluminum material (billet) 103 is inserted into a hole of a container 102 having a die 101 fixed to the tip, and the billet 103 in the container 102 is pressed into a pressure plate. (Stem) 104 is pressed toward the opening 105 formed in the die 101, and the aluminum material 103 is extruded from a gap (mold hole 105a) having a constant cross-sectional shape formed in the opening 105. The material is extruded into an extruded part having a constant cross-sectional shape. According to this extrusion processing method, by applying a compressive force to the billet 103 inserted into the container 102, it is possible to obtain an extruded part having a very complicated shape by one step of deformation.

FIG. 9 shows an example of a flat multi-hole tube 106 for an aluminum heat exchanger formed by such an aluminum extrusion method. The tube 106 includes a flat tube-shaped peripheral wall 106a having a width M and a plurality of partition walls 106b that divide the peripheral wall 106a into a plurality of flow paths h. As an extrusion die apparatus suitable for manufacturing the extruded flat multi-hole tube 106, an insert-type die described in Patent Document 1 below has been conventionally known.
FIG. 10 and FIG. 11 show an example of a conventional insert-type die apparatus described in Patent Document 1. The die 100 of this example extrudes an extruded flat multi-hole tube 106 made of aluminum shown in FIG. A pair of thick disk block-shaped female dies 111 and male dies 112 that can be inserted into and removed from a plurality of through holes H formed in the disk-shaped die holder D shown in FIG. It is composed of

  In FIG. 10, the female die 111 has an annular female-side spigot 113 formed on the outer periphery of the end surface facing the male die 112, and a concave portion 115 is formed on the center-side end surface 114 of the spigot 113. A slit-shaped hole 116 that penetrates from one end to the other end along the central axis of the female die 111 is formed at the center of the recess 115. In addition, two screw holes 119 and two pin holes 120 are formed at positions symmetrical around the recess 115.

  In FIG. 10, the male die 112 has a male side spigot part 122 formed on the end surface facing the female die 111. A comb-like projection 123 consisting of a plurality of projection pieces is formed at the center of the male die 112. The protrusion 123 is for defining a gap (mold hole) that is shaped into a product with the hole 116 by being inserted into the hole 116 of the female die 111. The male die 112 is formed with through holes 124 and 124 that are open on both end surfaces of the male die 112 along both sides of the protrusion 123. In the male die 112, two screw holes 125 and two pins 126 are formed on the peripheral side of the previous through holes 124, 124.

  Then, the male die 112 and the female die 111 having the above-described configuration are fitted into the inlay portions 113 and 122 of each other, and the pin 126 is fitted into the pin hole 120 so that they are integrated into a cylindrical shape, thereby forming the die 100. By attaching four dies 100 to a disk-shaped die holder D shown in FIG. 11 and attaching the whole to a container 102 shown in FIG. Further, when one die 100 in the die holder D becomes defective in the die 100 having this configuration, the extrusion process can be resumed by replacing only one corresponding die 100, or only the corresponding female die 111 or male die 112. Since it is possible, it has advantages such as being economical compared to the integrated die.

In addition, the applicant of the present application has applied for a patent on a die configured so that the protruding portion constituting the mold hole for extrusion can be individually replaced with another portion of the male die as a core member. (See Patent Document 2)
According to the technique described in Patent Document 2, a male die is configured from a core member provided with a protrusion and a core case on which the core member is mounted. By making it from die steel, the life of the die is extended, and when wear or damage occurs in part, replace only the core member or the core case and use the other part again. It has the feature that the interchangeability of such as can be improved.

JP-A-7-124634 Japanese Patent Laid-Open No. 2002-45913

FIG. 12 is an enlarged view of the comb-shaped protrusion 123 of the male die 112, and FIG. 13 is an enlarged view of the tip of the protrusion 123. The protrusion 123 is formed on the tip side of the substrate body 130. A plurality of elongated columnar protrusions 131 are arranged at equal intervals in a line, each head 131 has a head neck portion 132 at the tip, and a gap 133 is formed between adjacent protrusions 131. Has been.
In recent years, when the flat multi-hole tube 106 is manufactured, even if the width dimension M of the tube 106 is the same, the number of holes H tends to increase, for example, from four to ten or twenty. This is because the heat exchange efficiency tends to increase as the number of holes H increases, and there is a demand to increase the heat exchange efficiency of the tube 106 as much as possible.

  However, when the number of the holes H increases in this way, the gap Na between the individual head enlarged portions 132... Of the protrusion 131 becomes small as shown in FIG. 13, and the gap Nb between the protrusions 131 also increases. Since it becomes small, it becomes the tendency for an aluminum raw material to become difficult to flow through these clearance gaps. As a result, the flat multi-hole tube 106 as a product to be extruded may have a defect such that the partition 106b is insufficient in thickness, or the partition 106b is partially missing.

By the way, in the die apparatus configured to perform extrusion by attaching the die 100 to the die holder D described above, the stem 104 presses the aluminum material 103 against the die 100, and the die 100 side of the die 100 is utilized by utilizing the fluidity of the aluminum material. Extrusion is performed while flowing from the through-holes 124, 124 to the hole 116 on the female die 111 side through the protrusion 123. However, when the flat multi-hole tube 106 is a small and thin type, the protrusion 123 and the hole 116 are formed. Since the high pressure acts when the aluminum material is flowed and extruded, the shape of the mold hole for extrusion formed by the projection 123 of the male die 112 and the hole 116 of the female die 111 is determined. It is important to arrange. However, there is no established theory as to whether or not the state of the mold hole is controlled to be advantageous for extrusion molding.
Further, in the situation where the flat multi-hole tube 106 described above is thinned and miniaturized, the state of the mold hole affects the wear state of the protrusion 123 of the male die 112 and the hole 116 of the female die 11. In order to extend the life of a die device composed of a male die 112 and a female die 111, or to prevent damage and breakage of the die during extrusion, it is desired to grasp a desirable form of the mold hole.

  The present invention was devised in view of the above-mentioned problems, and even if the extruded product has a complicated shape, the material smoothly flows into the mold hole formed by the gap between the male die projection and the female die hole. Therefore, an object of the present invention is to provide an extrusion die apparatus that is capable of producing a good extruded product with few defects.

In order to solve the above-mentioned problems, the present invention comprises a die holder and an assembly die inserted into a support hole formed in the die holder and incorporated in the die holder, and a material billet is passed through the assembly die. In the die device that can be extruded by passing the mold hole of the assembly die by pressing the female die, the assembly die has a male die having a comb-blade projection and a female die having a hole into which the projection is inserted. The projection of the male die is desired in the hole of the female die, the mold hole is defined between them, and the fitting depth of the projection of the male die with respect to the opening of the hole is defined as d. , if the thickness of the extruded material obtained by extruding was t, Rutotomoni satisfy the relation 1.0 ≦ d / t ≦ 3, than the fitting depth of the projecting tip Characterized in that to increase the depth of the opening of the hole.

  In the present invention, the female die includes a body having a central hole and a plate member attached to the center of one end surface side of the body and having the hole, and the male die has the comb blade-like protrusion. A core member having a portion, a core case for inserting and holding the core member therein, and a cap member for partially covering the core member held by the core case and attached to the core case. The core case including the core member and the cap member is attached to the body of the female die so that the tip of the protruding portion of the core member is inserted into the hole of the plate member of the female die. it can.

  In the present invention, an insertion hole is formed on one end surface side of the body, the plate member is fitted into the insertion hole to position the hole of the female die, and the plate member is positioned on the one end surface side of the body. Protruding portions located on both sides are formed, fitting groove portions are formed in these protruding portions, and both ends of the core case of the male die are fitted into these fitting groove portions so that the protruding portion tips of the core member are It can be set as the structure formed by positioning in the hole part of a female die.

The extrusion method of the present invention comprises a die holder and an assembly die inserted into a support hole formed in the die holder and incorporated in the die holder, and presses a material billet so as to pass the assembly die. In the extrusion molding method of forming by passing through the mold hole of the assembly die, the assembly die includes a male die having a comb blade-like projection and a female die having a hole for inserting the projection. Protruding portions are desired in the holes of the female die, the mold holes are defined between them, and the fitting depth of the tip of the protruding portion of the male die with respect to the opening of the hole is d, and obtained by extrusion. If the thickness of the extruded material was t, with the relation of 1.0 ≦ d / t ≦ 3, than the fitting depth of the projecting tip, the depth of the opening of the hole large Comb characterized by extrusion.

As described above, according to the present invention, when the protrusion tip of the male die is fitted into the hole opening of the female die, d is the fitting depth, and t is the thickness of the extruded material, 1.0 ≦ Satisfactory extrusion moldability can be ensured by satisfying the relationship of d / t ≦ 3.
As a result, even if the extruded material as a product is thin, it is possible to produce an extruded material of good quality with high dimensional accuracy without variation in thickness. In addition, when manufacturing high-quality extruded materials with high dimensional accuracy, it is possible to achieve manufacturing at the proper extrusion pressure, reducing wear on the projections of male dies and holes on female dies, resulting in a long life as a die unit. Can be prevented from becoming shorter than necessary.

In addition, by configuring the female die from the body and plate member and the male die from the core member, core case, and cap member, even if part of the female die or male die is worn or damaged during extrusion, only that part Since it can be produced again by exchanging, the load at the time of parts replacement can be reduced and the production efficiency can be improved as compared with the conventional product in which the female die and the male die are integrated.
Since both ends of the male die core case are fitted into the fitting grooves provided in the protrusion of the female die body, and the protrusion of the core member attached to the core case is aligned with the hole of the female die, the male die core member It is possible to accurately position the projections of the female die and the hole of the plate member of the female die, and when the tip of the projection of the core member is fitted into the hole opening of the plate member in that state, the fitting depth is set to d When the thickness of the extruded material is t, by satisfying the relationship of 1.0 ≦ d / t ≦ 3, it is possible to produce a good quality extruded material with high dimensional accuracy without variation in the thickness. it can.

  According to the method for producing an extruded material of the present invention, when the protrusion tip of the male die is fitted into the hole opening of the female die, the insertion depth is d, and the thickness of the extruded material is t. Satisfying the relationship of ≦ d / t ≦ 3 The extruded material can be produced from the material billet with less resistance by smoothly flowing the material billet through the mold hole. Therefore, since it can extrude in the state where there is little wear in the projection part of a male die of a dice device, and the circumference, it becomes possible to lengthen the life of a dice device.

FIG. 1 is a cross-sectional view showing an example of an extrusion apparatus having a basic structure of an extrusion die apparatus according to the present invention. FIG. 2 is a simplified view showing the die device and the extruded part. FIG. 3 is a plan view of a die holder provided in the same die apparatus. FIG. 4 shows an example of an assembly die applied to the present invention. FIG. 4 (A) is an assembly view of a body, a nesting member, a core case, a core member, and a cap member, and FIG. FIG. 4C is a front view of the nesting member, FIG. 4D is a front view of the core case, FIG. 4E is a front view of the core member, and FIG. 4F is a front view of the cap member. . FIG. 5 shows an example of a body provided in an assembly die applied to the present invention. FIG. 5 (A) is a plan view, FIG. 5 (B) is a right side view, and FIG. 5 (C) is a front view. . 6A and 6B show an example of a cap member provided in the assembly die. FIG. 6A is a front view, FIG. 6B is a right side view, and FIG. 6C is a plan view. FIG. 7 is an enlarged view showing the positional relationship between the protrusion of the core member and the hole of the female die for forming the mold hole provided in the die device. FIG. 8 is a sectional view showing an example of a conventional extrusion apparatus. FIG. 9 is a perspective view showing an example of a flat multi-hole tube for a heat exchanger manufactured by an extrusion apparatus. FIG. 10 is an exploded perspective view showing an example of an assembly die apparatus applied to a conventional extrusion apparatus. FIG. 11 is a perspective view showing an example of a die holder to which an example of the assembly die apparatus is attached. FIG. 12 is an enlarged view of a protrusion in a core member of a male die provided in a conventional die device. FIG. 13 is a partially enlarged perspective view of a protrusion in the dice apparatus shown in FIG.

A first embodiment of an extrusion die apparatus according to the present invention will be described below.
FIG. 1 is a cross-sectional view showing an example of an extrusion apparatus equipped with the extrusion die apparatus according to the first embodiment of the present invention, FIG. 2 is a simplified view of the extrusion apparatus, and FIG. 3 is a rear view of the die holder. 4 is an exploded view showing an example of an assembly die attached to the die holder, FIG. 5 is a detailed view of a body portion of the assembly die, FIG. 6 is a detailed view of a cap portion of the assembly die, and FIG. 7 is a projection of a male die and a female die. It is sectional drawing which expands and shows the mold hole which consists of this hole part.
An extrusion apparatus A according to the embodiment shown in FIG. 1 includes a container 2 that is a thick-walled cylindrical container provided with a housing portion 1 that houses a material billet B made of aluminum or an aluminum alloy, and one side of the container 2. A stem (pressurizing means) 3 provided so as to be able to extrude the material billet B of the accommodating portion 1, a die holder 5, a back plate 6, and a bolster 7 provided on the container 2 on the side opposite to the installation side of the stem 3. And the main constituent.

In the structure of the embodiment shown in FIG. 1, a thick disc-shaped die holder 5 and a back plate 6 are inserted and integrated inside the die ring 8.
Four support holes 9 are formed in the die holder 5 at symmetrical positions around its central axis, and assembly dies 10 having the structure shown in FIG.
As shown in FIG. 4, the assembly die 10 of this example includes a hollow cylindrical body 11, a thick plate member (nested member) 12 having a race track shape mounted in the center of the body 11, A core case 13 mounted on the body 11 so as to overlap the body 11 above the plate member 12, a core member 15 inserted into the core case 13, and the core case 13 and the body 11 partially covering the core member 15 And a cap member 16 attached to the main body. When an aluminum alloy is assumed as the material billet B, these members are preferably composed of high-speed steel, die steel, or cemented carbide, but particularly for members that have many portions in contact with the high-pressure material billet B. It is desirable to form it from cemented carbide.

As shown in detail in FIG. 5, the body 11 has a cylindrical base portion 20 and a fitting portion that has an inclined surface 21 from the upper side of the base portion 20 and is slightly tapered. 22 and two projecting portions 23 projecting and formed at 180 ° intervals on both sides of the upper portion of the fitting portion 22. In addition, each projection 23 is divided into two at the central portion via the fitting groove 24, and the outer peripheral surface of each projection 23 is an inclined surface 23a having a tapered shape. ing. Further, on the upper surface side of the base portion 20, the portion between the left and right projections 23, 23 is wide and is slightly deeper than the previous fitting groove portion 24 and reaches the both end portions of the base portion 20. Is formed.
A slit-like oval central hole 25 penetrating the central portion of the base portion 20 is formed on the central side of the base portion 20, and a central hole 25 is formed on the upper center side of the base portion 20. A nesting insertion hole 26 that communicates is formed so as to open at the center of the concave groove 30, and the plate member (nesting member) 12 is fitted into the insertion hole 26. Further, on both sides of the base part 20, mounting holes 27 that pass through the base part 20 and the fitting part 21 and open to the center part of the fitting groove part 24 are formed. These mounting holes 27 are formed so that when a core case 13 and a cap member 16 described later are attached to the body 11, they can be aligned with mounting holes formed as described later on both ends thereof. .

  In the body 11, a refrigerant inflow passage 20 a and a refrigerant outflow passage 20 b that open on the bottom surface of the body 11 and the bottom surface of the insertion hole 26 are formed at positions sandwiching both sides of the slit-shaped central hole 25. A pair of refrigerant inflow passages 20a adjacent to each other are connected by a concave refrigerant passage 20b formed in the bottom surface of the insertion hole 26 to form a U-shaped refrigerant passage 20A.

  The plate member (nesting member) 12 has a slit-like oval hole 31 formed at the center thereof, and the hole 31 has substantially the same cross-sectional shape as the center hole 25 of the body 11. The plate member 12 is sized so as to be fitted into the insertion hole 26 of the body 11, and when the plate member 12 is fitted into the insertion hole 26, the hole portion 31 of the plate member 12 is formed in the concave groove portion 30 of the body 11. It is located at the center and is formed to communicate with the center hole 25 of the body 11.

  The core case 13 shown in FIG. 4 is formed in a horizontally long plate shape having a size that allows the left and right end portions 13a of the core case 13 to be fitted into the fitting groove portions 24 between the projecting portions 23 divided into two in the body 11. In the state where both end portions 13a of the core case 13 are fitted and joined to the fitting groove portion 24, both end portions of the core case 13 are arranged along the convex curved inclined surface 23a on the outer surface of the projection portion 23 of the body 11. A convex curved inclined surface 13b is formed on the outer surface of 13a.

The core case 13 includes a bottom surface 13c facing the groove bottom side of the fitting groove portion 24, the above-described inclined surfaces 13b disposed on both sides thereof, and a support surface 13d continuous with these inclined surfaces 13b, 13b and the bottom surface 13c, 13d and a support surface 13e facing the bottom surface 13c, and a slit-like fitting hole 35 for fitting a core member 15 to be described later penetrates the core case 13 in the center of the core case 13. The bottom surface 13c and the support surface 13e are formed so as to open at the center thereof, and protrusions 36 are formed on both sides of the opening of the fitting hole 35 in the bottom surface 13c.
Further, the both end portions 13a of the core case 13 are provided with insertion holes 37 for communicating with the mounting holes 27 of the body 11 in a state where the both end portions 13a of the core case 13 are fitted and joined to the fitting groove portions 24. Are formed so as to penetrate individually. Further, the protrusion length of the protrusion 36 from the bottom surface 13c is such that, as shown in FIG. 4 (A), the both ends 13a of the core case 13 are fitted into the fitting grooves 24 of the body 11 and joined. Is formed so as to face the plate member 12 in the body 11 with a slight gap.
Next, on the center side of the support surfaces 13d and 13d of the core case 13, it is located between the projections 36 and 36 along the extending direction of the previous fitting hole 35 from the upper side to the bottom side of the support surface 13d. A step portion 13g extending to the end is formed. These step portions 13g and 13g have an effect of facilitating the flow of the material billet that flows along the core case 13 during extrusion.

  The core member 15 includes a flat head portion 15a having a size that can be inserted into the slit-like fitting hole 35 of the core case 13, and a comb blade-like protrusion portion 15b formed on the tip end side of the head portion 15a. It comprises a stopper piece 15d formed so as to protrude left and right on the rear end side of the head portion 15a, and a semicircular receiving portion is provided on the base end side of each stopper piece 15d on the left and right sides of the rear end portion of the head portion 15a. A portion 15e is formed. The core member 15 having this configuration inserts the head portion 15a into the fitting hole 35 of the core case 13, and at the same time, the stopper piece 15d comes into contact with the support surface 13e of the core case 13, thereby The part 15b is partially opposed to the oval hole 31 of the plate member 12, and a gap is formed between the opening of the hole 31 and the tip of the comb blade 15b. The gap is configured as a mold hole 10 </ b> A for extrusion molding in the assembly die 10.

The cap member 16 is a horizontally long plate-like member having a desired thickness that comes into contact with the support surface 13e of the core case 13, and a bottom surface 16a that comes into contact with the support surface 13e of the core case 13. It has left and right side surfaces 16b that are continuous with the bottom surface 16a, a main surface 16d that is the front surface or the back surface, and a top surface 16e that faces the bottom surface 16a.
Further, at the center of the main surface 16d of the cap member 16, when the cap member 16 and the core case 13 are joined and integrated, a step portion 16g continuous with the step portion 13g formed in the core case 13 described above is provided. Is formed. Even in the step portion 16g of the cap member 16, the flow of the material billet at the time of extrusion is made smooth as in the step portion of the core case 13 described above.

A concave portion 16f is formed at the center of the bottom surface portion 16a so that the stopper piece 15d of the core 15 can be fitted and covered, and the cap 16 is abutted against the support surface 13e of the core case 13 at both ends of the cap member 16. A screw hole 40 for communicating with the insertion hole 37 of the core case 13 in the contacted state is formed.
These screw holes 40 are formed in the insertion holes 37 of the core case 13 when the plate member 12, the core case 13, the core member 15, and the cap member 16 are attached to the body 11 as shown in FIG. And the stepped hole type mounting hole 27 of the body 11, and the body 11 and the plate member are formed by screwing a fastener such as a bolt into the screw hole 40 through the holes. 12, the core case 13, the core member 15, and the cap member 16 can be firmly integrated.

As shown in FIG. 4A, the plate member 12, the core case 13, the core member 15, and the cap member 16 are attached to the body 11 configured as described above, and the mounting hole 27 of the body 11 and the core case 13 are fixed. By screwing bolts into the screw holes 40 of the cap member 16 through the insertion holes 37, they can be integrated into the assembly die 10.
Four assembly dies 10 are prepared, and these are individually inserted into the four support holes 9 of the die holder 5 shown in FIG. 1 to complete the die holder 5.

  The support hole 9 of the die holder 5 has a contour bell shape that is slightly tapered toward the container 1 side of the container 2. In the support hole 9, the accommodating portion 1 side is an introduction port 9 a, and an assembly die 10 assembled as shown in FIG. 4A is formed in a holding hole 9 b formed so as to slightly expand from the introduction port 9 a portion. Inserted and fixed. A rod-shaped bridge portion 41 is formed at the introduction port 9a portion of the support hole 9 so as to pass through the central portion of the introduction port 9a. A step portion 42 is formed on the surface on the one side, and the opening of the introduction port 9a is expanded.

  In the present embodiment, the disk-shaped die holder 5 is provided with four support holes 9 at equal intervals surrounding the central portion thereof as shown in FIG. 3, and these four support holes 9 are provided in the respective inlets 9a. An example of the shape of the step 42 formed is shown in FIG. In the die holder 5, the four inlets 9 a appear to be divided into two at the bridge part 41 as shown in FIG. 3 when viewed from the housing part 1 side. Step portions 42a and 42b are formed vertically so as to be paired with each other.

  When the assembly die 10 is fitted to the support holes 9 and the assembly die 10 is attached to the die holder 5, the cap member 16 of the assembly die 10 is arranged so as to be adjacent to each other in the length direction of the bridge portion 41. Thereby, from the introduction ports 9 a and 9 a arranged on both sides of the bridge portion 41 on the inner side of the support hole 9, the space portions on both sides in the width direction of the cap member 16 and the space portions on both sides in the width direction of the core case 13 are arranged. A flow path of communicating billets can be defined. In addition, this flow path reaches the concave groove portion 30 of the body 11, and the internal space of the plate member 12 through the mold hole 10 </ b> A defined between the core member 15 of the assembly die 10 and the opening of the plate member 12. A series of flow paths that pass through and reach the central hole 25 of the body 11 are formed.

In the arrangement configuration of the step portions 42 in the die holder 5 shown in FIG. 3, in the region where the four introduction ports 9 a are arranged, the four step portions 42 a located from the inner side are semicircular in the opening portion of the introduction port 9 a. The other four step portions 42b that surround the portion and are formed in a rectangular shape that is slightly longer in the vertical and horizontal directions than the region where the four introduction ports 9a are arranged are located at the previous step portion. The bulging part 42c is formed and enlarged in the outer part from the outer side of the die holder 5 rather than 42a, and another part is formed in the magnitude | size equivalent to the step part 42a.
In FIG. 3, as an example, the stepped portion 42b is illustrated as a shape in which the bulging portions 42c are slightly bulged in the left and right directions and the vertical direction on the outer side thereof, but this bulging shape is only an example. In the present invention, the shape is not limited to the shape shown in FIG. 3, and when the four inlets 9 a are arranged at 90 ° intervals on the center side of the die holder 5, the four inlets 9 a are positioned outside the region occupied by the four inlets 9 a. It is only necessary to extend the end portion side of the stepped portion 42b only in a necessary width in any one of the upper, lower, left and right directions in FIG. Thus, by providing the bulging part 42b which expands a step part, the flow resistance at the time of extruding the raw material billet 3 mentioned later can be reduced.

  Next, through holes 6a communicating with the support holes 9 of the die holder 5 are formed in the back plate 6 provided on the back side of the die holder 5 in which the four support holes 9 are formed as described above. Further, a passage hole 7a is similarly formed in the bolster 7 provided on the back side of the bolster 7 so that the extruded part C extruded by the assembly die 10 can be moved. In the structure shown in FIG. 1, a push member P is further provided outside the bolster 7, but this member may be omitted.

In order to manufacture extruded parts such as flat multi-hole tubes for heat exchangers by the extrusion apparatus configured as described above, the assembly die 10 is mounted on the die holder 5 and set in the extrusion apparatus shown in FIG. A material billet B such as aluminum or aluminum alloy is accommodated in the accommodating portion 1, and pressure is applied to the material billet B by the stem 3.
By this operation, the material billet B flows into the introduction port 9a side of the die holder 5 from the housing portion 1 through the step portions 42a and 42b, and the space in the support hole on both sides in the width direction of the cap member 16 and the width of the core case 13. Passes through the inner space of the support hole on both sides in the direction, reaches the concave groove 30 side of the body 11, and passes through the mold hole 10 </ b> A defined between the core member 15 of the assembly die 10 and the opening of the plate member 12. Then, after being processed into the shape of the mold hole 10A, the extruded part C is obtained through the passage hole 6a of the back plate 6 and the passage hole 7a of the bolster 7.
In this embodiment, as shown in FIG. 4, a mold hole 10 </ b> A defined by a comb blade-shaped protrusion 15 b and a plate member 12 having an oval hole 31 has a cross-sectional shape schematically shown in FIG. 2. A flat multi-hole tube (extruded part) C is obtained. The flat multi-hole tube C has a flat cylindrical shape in which a plurality of partition walls 51 are formed in parallel at a predetermined interval inside a peripheral wall 50 having an elliptical cross section.

The mold hole 10A defined by the protrusion 15b of the core member 15 and the hole 31 of the plate member 12 shown in FIG. 4 is in a state shown in FIG.
That is, assuming that the fitting depth of the tip of the protrusion 15b with respect to the opening 31a of the hole 31 of the plate member 12 is d and the thickness of the extruded material obtained by the extrusion process is t, 1.0 ≦ d / T ≦ 3 is satisfied. Here, the thickness t of the extruded member corresponds to the thickness of the peripheral wall 50 or the thickness of the partition wall 51 in the flat multi-hole tube C shown in FIG. In the present embodiment, in the flat multi-hole tube C, the thickness of the peripheral wall 50 and the thickness of the partition wall 51 are set to the same value. When the thicknesses of both are different, the wall thickness of the peripheral wall 50 is set. This is because the effect of defining d / t has a greater influence on the peripheral wall 50 than the partition wall 51.

If the fitting depth d at the tip of the projection 15b is defined within the range of the above formula, an extruded part with high dimensional accuracy can be obtained with an appropriate extrusion pressure. That is, even if it is a small flat multi-hole tube C which is thin and has many partition walls, a flat multi-hole tube (extruded part) C having an accurate dimension without thickness fluctuation is produced with an appropriate extrusion pressure. be able to.
Here, in the relationship of 1.0 ≦ d / t ≦ 3, if the value of d / t is less than 1.0, the wall thickness is likely to fluctuate, the product shape does not come out correctly, and the value of d / t is If it exceeds 3, the extrusion pressure becomes too high and extrusion tends to be impossible.

By the way, in the extrusion process described above, even if an attempt is made to apply the pressure evenly in the surface direction of the extrusion billet B to the raw billet B by the pressing force of the stem 3 and to extrude it to the four assembly dies 10 side, four introductions are made. The material billet B does not flow at a constant speed in any part of the entire area of the mouth 9a. That is, when the four inlets 9a are viewed as shown in FIG. 3, a comparison between a part of the inlet 9a near the center of the die holder 5 and a part of the inlet 9a near the outer periphery of the die holder 5 The flow velocity of the material flowing on the side closer to the center tends to be faster than the flow velocity of the material flowing on the side closer to the outer periphery.
Therefore, in the present embodiment, a bulging portion 42c is formed on the outer portion of the step portion 42 located in the region where the four introduction ports 9a are arranged to increase the area of the step portion so that the material can easily flow into the introduction port 9a. Therefore, as a result of making the flow state of the material billet B as uniform as possible in the entire cross-sectional area of the four inlets 9a, it is possible to apply an equal pressure to each part of the assembly die 10, and to each part of the assembly die 10 As a result of being able to apply an appropriate extrusion pressure, it is possible to manufacture a high-quality flat multi-hole tube C having a uniform wall thickness with no uneven thickness in the partition 51 portion.

  Further, in the dice apparatus of the present embodiment, by providing step portions 42a and 42b at the opening on the material billet B side of the introduction port 9a, the area at the introduction portion of the material billet B with respect to the introduction port 9a is expanded, Since the flow resistance at the time of introduction is reduced, the material flow can be made smoother than that of a conventional die apparatus not provided with a step portion, and the extrusion process can be performed with less resistance.

  Next, in the die apparatus according to the present embodiment, the bridge portion 41 of the die holder 5 is provided on the material billet B side of the cap member 16 of the assembly die 10, and the bridge portion 41 is configured to directly receive the pressure from the material billet B. Since the pressure from the material billet acting on the cap member 16 of the assembly die 10 existing behind the bridge portion 41 is reduced, the pressure at the time of extrusion directly acts on the cap member 16 of the assembly die 10 in particular. And the pressure on the cap member 16 can be reduced by the bridge portion 41. As a result, the pressure applied to other parts of the assembly die 10 can be reduced, and the assembly die 10 can be protected. The breakage and damage can be prevented or suppressed.

Next, in the dice apparatus of the previous embodiment, the step portion 16g is formed in the central portion of the main surfaces 16d and 16d of the cap member 16, so that the material billet B flows along the step portion 16g. Provides guidance and stabilizes the flow of material billets. Thereby, the fluidity of the material billet B is controlled to reduce the flow resistance.
The flow of the material billet B then reaches the stepped portion 13g of the core case 13, and the stepped portion 15b of the comb blade and the hole 31 of the plate member 12 while adjusting the fluidity of the material billet B also in the stepped portion 13g. And is extruded into a target shape through a mold hole 10A defined between the two. In the dice apparatus of this embodiment, the flow of the material billet B can be adjusted in both the cap member 16 and the core case 13 as described above, and the flow of the material billet B up to the mold hole 10A can be made smooth. In the extrusion process, it has a feature that it can be processed as smoothly as possible.

  Further, in this embodiment, when the assembly die 10 is fitted into the support hole 9, the inclined surface 23 a of the body 11 of the female die is aligned with the tapered inclined surface 9 c of the support hole 9. It is possible to prevent displacement of the die 10 in the radial direction and the long axis direction, and as a result, it is possible to manufacture an extruded part having no wall thickness variation. A high-quality flat multi-hole tube C having a uniform wall thickness can be produced.

  Furthermore, in this embodiment, when the assembly die 10 is fitted into the support hole 9, the inclined surfaces 13 b formed at both ends of the core case 13 match the tapered inner surface of the support hole 9, so As a result of the positioning of the core case 13 being sandwiched between the inner surfaces of the core 9 and the displacement of the core case 13 being suppressed, it is possible to manufacture an extruded part having no wall thickness variation. A high-quality flat multi-hole tube C having a uniform wall thickness with no uneven thickness can be produced.

Four assembly dies having the structure shown in FIG. 4 were incorporated into the die apparatus having the structure shown in FIG. 1, and extrusion processing was performed. In this assembly die, a plate member and a core member were formed from cemented carbide, and a body, a core case, and a cap member were formed from die steel, and were subjected to an extrusion test.
JIS 1050 alloy material aluminum is used. Extrusion conditions shown in Table 1 below. Extrusion multiholes with 21 holes, 16 mm overall width, 1.2 mm overall thickness, and 0.2 mm peripheral wall and partition wall thickness A tube was manufactured.
In the extrusion apparatus, the outer diameter of the body was 60 mm, and the shape of the hole of the plate member and the shape of the protrusion of the core member were the same as the size of the target extruded multi-hole tube that they defined. Extrusion was performed at an extrusion pressure of 74 kg / mm ² by a stem to produce a flat multi-hole tube. During extrusion, the temperature at the center of the die was constant at 500 ° C.

For the obtained flat multi-hole tube, the value of the insertion depth d of the protrusion of the core member to the plate member on the die device side, the value of the thickness t of the flat multi-hole tube to be manufactured, and Table 1 shows the measurement results of the wall thickness variation and the extrusion pressure of the peripheral wall and the partition wall in the flat multi-hole tube.
Thickness fluctuation is the result of measuring the number of thin parts that are thinner than 10% of the target wall thickness on the partition wall or peripheral wall when 30 samples are manufactured. Indicates.

"Table 1"
Thickness (mm) d / t Number of occurrences of fluctuating thickness Extrusion pressure increase rate
0.2 0.5 7-
0.2 1.0 2 1.5%
0.2 1.5 1 2.0%
0.2 2.00 3.0%
0.2 2.5 0 3.2%
0.2 3.0 0 3.8%
0.2 3.5 3 4.5%

From the results shown in Table 1, by setting the d / t value in the range of 1.0 to 3, it is possible to produce a flat multi-hole tube with a high dimensional accuracy with a small number of wall thickness fluctuations generated by an appropriate extrusion pressure. It became clear.
In contrast, a flat multi-hole tube manufactured with a d / t value as small as 0.5 has a large variation in wall thickness, resulting in an extruded member with low dimensional accuracy. Moreover, in the flat multi-hole tube manufactured by increasing the value of d / t to 3.5, the extrusion pressure increased and a large load was applied to the extrusion apparatus. When the extrusion pressure is increased in this way, a large pressure acts on either the projection of the male die core member or the hole of the female die plate member, so that when the flat multi-hole tube is continuously manufactured, the core member can be produced in a short period of time. Or it may lead to the wear or damage of the plate member.
Therefore, from the above test results, when an assembly die having the structure shown in FIG. 4 is applied to the die apparatus shown in FIG. 1 to produce a flat multi-hole tube, the value of d / t is 1.0 to 3.0. It turned out to be important to be in range.

  A ... Extrusion device, B ... Material billet, C ... Flat multi-hole tube (extruded member), 1 ... Housing, 2 ... Container, 3 ... Stem, 5 ... Die holder, 6 ... Back plate, 7 ... Bolster, 8 ... Die ring, 9 ... support hole, 10 ... assembly die, 10A ... mold hole, 11 ... body, 12 ... plate member (nesting member), 13 ... core case, 13b ... inclined surface, 15 ... core member, 15b ... projection , 15f ... strut part, 15g ... head part, 15j ... neck part, 15k ... material introduction path, 15m ... material passage path, 15n ... material connection path, 15p ... Earl part, 16 ... cap member, 31 ... hole part,

Claims (4)

A die holder and an assembly die inserted into a support hole formed in the die holder and incorporated in the die holder are provided. The material billet is pressed so as to pass through the assembly die and passes through the mold hole of the assembly die In the die device that can be extruded,
The assembly die includes a male die having a comb blade-like protrusion and a female die having a hole for inserting the protrusion, and the protrusion of the male die is desired in the hole of the female die, and the Defining a mold cavity,
The fitting depth for the hole opening of the protrusion tip of the Osudaisu is d, if the thickness of the extruded material obtained by extruding was t, Ru satisfy the relation 1.0 ≦ d / t ≦ 3 In addition, the extrusion die apparatus is characterized in that the depth of the opening of the hole is made larger than the fitting depth at the tip of the protrusion . The female die comprises a body having a central hole, and a plate member attached to the center of one end surface side of the body and having the hole.
The male die has a core member provided with the comb blade-shaped protrusion, a core case for inserting and holding the core member therein, and a core partially covering the core member held by the core case. A cap member attached to the case,
The core case including the core member and the cap member is attached to the body of the female die, and the tip of the protruding portion of the core member is inserted into the hole of the plate member of the female die. A die apparatus for extrusion processing as described in 1.   An insertion hole is formed on one end surface side of the body, the plate member is fitted into the insertion hole to position the hole of the female die, and the one end surface side of the body is positioned on both sides of the plate member. Protrusions are formed, fitting grooves are formed in these protrusions, both ends of the core case of the male die are fitted into these fitting grooves, and the tips of the protrusions of the core member are inserted into the holes of the female die. The extrusion die apparatus according to claim 2, wherein the extrusion die apparatus is positioned at a position. A die holder and an assembly die inserted into a support hole formed in the die holder and incorporated in the die holder are provided, and the material billet is pressed so as to pass through the assembly die and passes through the mold hole of the assembly die. In the extrusion molding method of forming,
The assembly die includes a male die having a comb blade-like protrusion and a female die having a hole for inserting the protrusion, and the protrusion of the male die is desired in the hole of the female die, and the Defining a mold cavity,
When the fitting depth to the hole opening at the tip of the protrusion of the male die is d and the thickness of the extruded material obtained by extrusion is t, the relationship is 1.0 ≦ d / t ≦ 3 , The extrusion method is characterized in that the extrusion is performed by making the depth of the opening of the hole larger than the fitting depth at the tip of the protrusion .

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