Extrusion dies for molding patterned products

Abstract

To provide an extrusion die for molding of a patterned product which prevents a product member from getting caught at the pattern molding tool side when an uneven pattern is molded on a surface of the product member to achieve improvement of productivity.SOLUTION: An extrusion die for molding of a patterned product includes: an upper die 10 configured to introduce a thermoplastic member; a lower die 20 supporting the upper die 10; and a pattern molding tool 30 which rotates in conjunction with movement of a product member 50 to mold an uneven pattern on a surface of the product member 50. The upper die 10 has a bearing part 13 which molds the thermoplastic member into a shape of the product member 50. A rear surface side molding surface of the product member 50 in the bearing part 13 is provided with a projection molding part 14 for molding a projection 54 which hooks on the projection molding part 14 to prevent the product member 50 from getting caught in the pattern molding tool 30.SELECTED DRAWING: Figure 3

Description

Technical Field

[0004]

[0001] This invention relates to an extrusion die for forming a patterned product by forming a predetermined pattern on the surface of a member for a product formed of, for example, an aluminum alloy as a thermoplastic material.

Background Art

[0002] Generally, aluminum alloys and the like are suitable for extrusion processing because they have excellent workability and can be expected to have a high degree of freedom in cross-sectional shape, and various shapes can be obtained, and are currently widely adopted. For example, it is also possible to form concavo-convex patterns such as a rack shape or a wave shape on the surface by extrusion processing of an aluminum alloy, or concavo-convex patterns formed continuously in the longitudinal direction of the surface and the width direction orthogonal to the longitudinal direction. Examples of products with concavo-convex patterns formed on the surface include joint covers for buildings, floor materials having a slope or anti-slip function, and the like.

[0003] Conventionally, as a technique for extrusion molding a product with a concavo-convex pattern, an extrusion die for forming a pattern on the surface of a member for a product formed of a thermoplastic member continuously extruded from a material supply side is known (see, for example, Patent Documents 1 and 2).

[0004] According to the extrusion die for forming a patterned product described in Patent Documents 1 and 2, a metal made of an aluminum alloy, which is a thermoplastic member continuously extruded with a softness similar to that of substantially clay, is formed into a member for a product at a bearing portion, and a concavo-convex pattern is formed on the surface of the member for a product by a pattern forming tool having a concavo-convex pattern forming portion on the surface that rotates as the metal is extruded. That is, when a concavo-convex pattern is formed on the surface of the member for a product, the convex portion of the concavo-convex pattern forming portion provided on the surface of the pattern forming tool bites into the surface of the member for a product to form the pattern. In the extrusion die for forming a patterned product described in Patent Document 2, a concavo-convex pattern is formed on the surface of a member for a product having a bent portion orthogonal to the surface portion at one end in the width direction of the flat surface portion in the same manner as described above.

Prior Art Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2020-146697 [Patent Document 2] Japanese Patent Publication No. 2022-22816 [Overview of the project] [Problems that the invention aims to solve]

[0006] However, if the surface of the product component has deep indentations or if the indentations of the pattern forming part on the surface of the pattern forming tool are continuous in the width direction of the product component, the contact area between the product component and the pattern forming tool increases, and the bending load from the pattern forming tool increases, raising concerns that the product component may get caught in the pattern forming tool. When the product component gets caught in the pattern forming tool, the surface of the product component deforms as if it has been crushed, and the back side is pulled, resulting in a defective product. As a result, the defective product has to be discarded, leading to waste of material and work time, and raising concerns about a decrease in productivity.

[0007] This invention has been made in view of the above circumstances, and aims to provide an extrusion die for forming patterned products that prevents the product component from getting caught in the pattern forming tool when forming an uneven pattern on the surface of the product component, thereby improving productivity. [Means for solving the problem]

[0008] To achieve the above objectives, the present invention provides an extrusion die for forming a patterned product, which forms a pattern on the surface of a product component formed from a thermoplastic material continuously extruded from a material supply side, comprising: an upper die into which the thermoplastic material is introduced; a lower die supporting the upper die; and a pattern forming tool that rotates with the movement of the product component to form the pattern on the surface of the product component, wherein the upper die has a bearing portion for forming the thermoplastic material into the shape of the product component, and a projection forming portion is provided on the back side molding surface of the product component in the bearing portion for forming a projection that prevents the product component from being caught in the pattern forming tool by a latch (Claim 1). In this case, it is preferable that the projection forming portion is formed in a concave shape that bulges out from the back side molding surface of the bearing portion toward the tip (Claim 2).

[0009] With this configuration, the thermoplastic material is extruded and passes through the bearing section, thereby forming the shape of the product material, and a projection to prevent it from getting caught is formed on the back side of the product material. A pressing force from the pattern forming tool is applied to the surface of the thermoplastic material, forming an uneven pattern on the surface of the product material. At this time, a bending force is applied to the product material due to the bending load from the pattern forming tool, but the projection formed on the back side of the product material in the bearing section is engaged with the projection forming section, and an opposing force is applied to the bending force, thus preventing the product material from getting caught on the pattern forming tool side. In addition, since a projection is formed along the longitudinal direction on the back side of the product material, the projection can be given a reinforcing function.

[0010] In this invention, it is preferable that the projection molding portion is provided in the center of the back side molding surface of the bearing portion (Claim 3).

[0011] By configuring it in this way, the projection formed in the center of the back side of the product component is engaged with the projection forming part provided in the center of the back side molding surface of the bearing part, thereby preventing the product component from being caught on the pattern forming tool side.

[0012] Furthermore, in this invention, it is preferable that the projection molding portion is provided at the central part of the back side molding surface of the bearing portion and at both ends of the back side molding surface (Claim 4).

[0013] By configuring it in this way, the protrusions formed in the center of the back side of the product component and at both ends of the back side are engaged with the central part of the back side molding surface of the bearing component and with the protrusions formed at both ends of the back side molding surface, thereby preventing the product component from being caught on the pattern molding tool side.

[0014] Furthermore, in this invention, it is preferable that the protruding molded portion is provided at both ends or near both ends on the molded surface on the back side of the bearing portion (Claim 5).

[0015] By configuring it in this way, the protrusions formed at or near both ends on the back side of the product component are engaged with the protrusion-forming portions provided at or near both ends on the back side molding surface of the bearing portion, thereby preventing the product component from being caught on the pattern molding tool side.

[0016] In addition, in this invention, it is preferable that the pattern forming tool is rotatably disposed below the bearing portion in the upper die and adjustable in pressure toward the product member side (Claim 6).

[0017] By configuring it in this way, the pattern forming tool can be positioned closer to the bottom of the bearing section, thus shortening the distance between the point of application of the bending load by the pattern forming tool on the product component and the projection forming section on the bearing section. This further ensures that the product component is not caught in the pattern forming tool. [Effects of the Invention]

[0018] According to the present invention, since it is configured as described above, when forming an uneven pattern on the surface of a product member, the protrusion formed on the back surface side of the product member in the bearing portion is hooked by the protrusion forming portion, thereby preventing the product member from being卷入 into the pattern forming tool side. As a result, waste of materials and waste of working time can be saved, and productivity can be improved. In addition, since the protrusion formed along the longitudinal direction on the back surface side of the product member can have a reinforcing function, the strength of the product member can be improved.

Brief Description of the Drawings

[0019] [Figure 1] It is a cross-sectional view showing the use state of an extrusion die for forming a patterned product according to this invention. [Figure 2] It is a cross-sectional view showing the main part of FIG. 1. [Figure 3] It is a cross-sectional perspective view showing the use state of the extrusion die for forming a patterned product. [Figure 4] It is a schematic side view (a) showing the state of preventing entrainment during pattern forming by a pattern forming tool in this invention and a schematic plan view (b) showing the state of preventing entrainment by a protrusion forming portion in this invention. [Figure 5] It is a plan view (a) of an upper die in this invention and an enlarged plan view (b) showing a bearing portion. [Figure 5A] It is a plan view (a) of another upper die in this invention and an enlarged plan view (b) showing a bearing portion. [Figure 6] It shows another embodiment of the protrusion forming portion in this invention, and (a) shows the state provided at the central portion, (b) shows the state provided at the central portion and both end portions, (c) shows the state provided at both end portions, and (d) shows the state provided at positions near both end portions, which are enlarged plan views. [Figure 6A] It is a schematic plan view showing the state of preventing entrainment according to another embodiment shown in FIG. 6 of the protrusion forming portion in this invention. [Figure 6B] It is an enlarged plan view showing the main part of still another embodiment of the protrusion forming portion in this invention. [Figure 7]This diagram illustrates the position adjustment mechanism for the pattern forming tool in this invention. (a) shows the pattern forming tool in its maximum embedded state in the product component, and (b) is a plan view showing a cross-section of a portion of the pattern forming tool in its slightly embedded state in the product component. [Figure 8] This is a cross-sectional view along line II in Figure 7(b). [Figure 9] This is a perspective view showing an example of a patterned product formed by the extrusion die for forming patterned products according to this invention. [Figure 10] This is a perspective view (a) and a partially enlarged plan view (b) of another example of a patterned product formed by the extrusion die for forming patterned products according to this invention. [Modes for carrying out the invention]

[0020] The embodiments for carrying out this invention will be described in detail below with reference to the attached drawings.

[0021] The extrusion die 1 for forming patterned products according to this invention (hereinafter simply referred to as "extrusion die 1") is configured to form a product member 50 of a desired shape by continuously supplying a thermoplastic material such as an aluminum alloy metal M to the extrusion die 1 via a ram, stem, etc. (not shown) in the bearing portion 13 of the extrusion die 1.

[0022] As shown in Figure 9, the product component 50 is a long, plate-shaped material, with a continuous pattern of ridges and depressions 53 on its surface 51, and projections 54 for preventing entanglement are provided along the longitudinal direction on its back surface 52.

[0023] The extrusion die 1 comprises an upper die 10 into which metal M pressed from a container 40 is introduced, a lower die 20 that supports the upper die 10, and a pattern forming tool 30 that rotates with the movement of the product member 50 to form a pattern 53 on the surface of the product member 50. The upper die 10 and the lower die 20 are connected, for example, by a connecting bolt (not shown) inserted from the back surface of the lower die 20, with a recess 11 formed on one side of the upper die 10 and a protrusion 21 formed on one side of the lower die 20 fitted together.

[0024] As shown in Figure 1, the container 40 is placed on the upper surface of the upper die 10 and is configured to contain the metal M and maintain the temperature of the metal M at 400-500°C.

[0025] As shown in Figures 1 and 3, the upper die 10 is formed with a slight recess in the central part for placing the container 40, and a metal introduction recess 12 is formed in the center of the recess. A bearing portion 13 is formed at the bottom of the metal introduction recess 12 for shaping the metal M into the shape of the product component 50.

[0026] On the back side molding surface 13a of the product member 50 in the bearing section 13, there is a projection molding section 14 that forms a projection 54 that prevents the product member 50 from getting caught in the pattern molding tool 30 when an uneven pattern is formed on the surface of the product member 50 by the pattern molding tool 30. In this case, as shown in Figures 4 and 5, the protruding molded portion 14 is provided in the center of the back side molded surface 13a of the bearing portion 13, and is formed in a substantially trapezoidal concave shape with both sides bulging in an inclined manner toward the tip from the back side molded surface 13a. In other words, the protruding molded portion 14 is formed in a substantially trapezoidal shape having inclined portions 14b that widen toward the tip from both sides of the opening 14a provided in the back side molded surface 13a.

[0027] Furthermore, as shown in Figure 2, an upper guide portion 15 is formed below the bearing portion 13, and is continuous with the bearing portion 13. One side of the upper guide portion 15 is provided with a space 16 for arranging a pattern forming tool 30, which will be described later. A relief portion 15a is formed on the side of the upper guide portion 15 that faces the space 16.

[0028] Furthermore, a projection 17 is provided on the lower side surface of the bearing section 13, above the portion where the pattern forming tool 30 is installed, projecting downstream. This projection 17 is formed to follow and cover a portion of the outer circumference of the upper side of the pattern forming tool 30. The surface of this projection 17 facing the metal M is formed to have a predetermined gap between it and the metal M, and this portion is configured to function as an upper guide section 15. In addition, the lower part of the side surface where the projection 17 is not formed is inclined so that the gap between it and the metal M increases as the metal M moves forward, and this inclined surface is configured to function as an upper guide section 15.

[0029] The space 16 in which the pattern forming tool 30 is placed has a substantially rectangular cross-section, and mounting holes 18 for mounting the mounting member 31 of the pattern forming tool 30 are formed on both sides along the length of the space 16. Figure 7 shows one of the mounting holes 18. This mounting hole 18 is provided along the longitudinal direction of the space 16, is rectangular in shape with a predetermined width, and is formed to a predetermined depth. The mounting member 31 is then inserted into the mounting hole 18.

[0030] Furthermore, through holes 19 communicating with the mounting member installation holes 18 are formed on the outer circumferential surface of the upper die 10 at positions along the extension lines of each mounting member installation hole 18. The inner diameter of these through holes 19 on the mounting member installation hole 18 side is smaller than the inner diameter on the outer circumferential side of the upper die 10, and female threads are formed in the portion with the smaller inner diameter. Position adjustment bolts 32, which constitute the position adjustment mechanism of the pattern forming tool 30 described later, are screwed into these female threads. Two of these female threads are formed to press against the upper and lower sides of the mounting member 31.

[0031] The lower die 20 has a lower guide portion 22 that guides the metal M. This lower guide portion 22 has a larger opening area than the opening area at the lower end of the upper guide portion 15 and is formed along the axial direction of the lower die 20.

[0032] The pattern forming tool 30 forms a pattern 53 with continuous ridges and depressions in the longitudinal direction on the surface of the metal M, and is formed by a roller with peaks and valleys on its outer surface at appropriate intervals. As a result, the pattern 53 formed on the surface of the product component 50 has recesses 53a and protrusions 53b corresponding to the peaks and valleys of the pattern forming tool 30, and is formed by sandwiching the surface of the metal M between the pattern forming tool 30 and the relief portion 15a.

[0033] Next, the pattern forming tool 30 and the mounting structure of the pattern forming tool 30 will be described. As mentioned above, the pattern forming tool 30 is positioned opposite the relief portion 15a. Also, as shown in Figure 8, a bearing 33 is fitted into the mounting member 31, and a shaft portion 34 for supporting the pattern forming tool 30 is fitted into the bearing 33. As shown in Figure 8, this mounting member 31 is inserted into the mounting member installation hole 18 and is slidably fitted into the metal M side. As shown in Figure 2, the pattern forming tool 30 and the shaft portion 34 are connected by a key 35.

[0034] Next, the structure of the position adjustment mechanism will be described with reference to Figure 7. The position adjustment mechanism consists of a position adjustment bolt 32 that abuts against one end of the mounting member 31 in the longitudinal direction, and an adjustment spacer 36 that is detachably provided in the mounting member installation hole 18.

[0035] The position adjustment bolts 32 are configured to be screwed into the female threads formed on the outer circumference of the upper die 10 toward the side of the mounting member 31, so that the tip of each position adjustment bolt 32 abuts against one end of the mounting member 31 in the longitudinal direction.

[0036] For example, as shown in Figure 7(a), when the position adjustment bolt 32 is screwed into the female thread, the mounting member 31 slides in the direction of arrow Y within the mounting member installation hole 18, thereby adjusting the amount by which the top of the pattern forming tool 30 bites into a predetermined surface of the metal M, that is, adjusting the distance between the pattern forming tool 30 and the surface. Note that Figure 7(a) shows the position adjustment bolt 32 screwed in to its maximum extent, and at this time, the other side surface of the mounting member 31 is in contact with the end of the mounting member installation hole 18. Also, there is a predetermined gap L between one side surface of the mounting member 31 and one side surface of the mounting member installation hole 18.

[0037] Figure 7(b) shows an adjustment method for reducing the amount that the top of the pattern forming tool 30 bites into the surface of the metal M. In this case, turning the position adjustment bolt 32 in the reverse direction allows the mounting member 31 to slide freely within the mounting member installation hole 18. First, the position adjustment bolt 32 is turned in the reverse direction until the gap L of the predetermined dimension is eliminated.

[0038] Next, grasp the pattern forming tool 30 by hand and pull it towards the position adjustment bolt 32. Then, insert the adjustment spacer 36 into the gap L1 on the other side so that the top of the pattern forming tool 30 bites into the metal M as set, and screw in the position adjustment bolt 32 until it contacts the side of the mounting member 31. At this time, the combined dimension of the gap L1 between the mounting member 31 and the side of the mounting member installation hole 18, and the gap L2 between the mounting member 31 and the other side of the mounting member installation hole 18, is the same as the gap L (=L1+L2) in Figure 7(a) above.

[0039] Furthermore, the position adjustment bolts 32 can be operated by operating either one of the position adjustment bolts 32, or only one position adjustment bolt 32 may be provided.

[0040] As shown in Figure 8, the adjustment spacer 36 is formed from a plate finished to a predetermined thickness, and multiple types of plates with different thicknesses are prepared in advance so that the amount of biting into the metal M at the top of the pattern forming tool 30 can be adjusted. This adjustment spacer 36 is formed to have a length that is approximately the same as the thickness of the mounting member 31.

[0041] Furthermore, as shown in Figure 8, gripping portions 37 are formed at both ends in the width direction of the upper end of the adjustment spacer 36. These gripping portions 37 are formed to allow the adjustment spacer 36 to be inserted into the mounting hole 18 of the mounting member by being gripped with a predetermined clamping tool (jig).

[0042] Next, a method for forming a product component 50 using the extrusion die 1 configured as described above will be explained. Prior to the operation, a pattern forming tool 30 for forming a pattern 53 with a recessed shape on the surface of the metal M is set in the lower die 20. At this time, the position of the pattern forming tool 30 is set using a position adjustment bolt 32 in order to set the amount by which the top of the pattern forming tool 30 bites into the surface of the product component 50, that is, the height dimensions of the recessed part 53a and the convex part 53b to the desired dimensions.

[0043] Metal M is introduced from the container 40 into the upper die 10, and then pushed downstream via the metal introduction recess 12. As the metal M passes between the container 40 and the bearing portion 13, its outer shape is formed to match the outer shape of the product component 50, and a roughly trapezoidal projection 54 with a bulging tip is formed on the back surface of the metal M by the projection forming portion 14. The metal M is then pushed out towards the lower die 20 along the upper guide portion 15 of the upper die 10. Since the projection portion 17 is formed to cover the pattern forming tool 30 provided on the upper die 10, it is possible to prevent the tip portion of the metal M from coming into contact with the pattern forming tool 30, especially at the start of the extrusion, before it is caught between the pattern forming tool 30 and the relief portion 15a. In other words, the pressing force of the pattern forming tool 30 can be applied to the metal M at the intended position.

[0044] Then, as the metal M extruded into the upper guide portion 15 is pushed downward while being guided by the upper guide portion 15, a pattern forming tool 30 rotates in conjunction with the extrusion of the metal M, and a continuous pattern 53 with uneven surfaces is formed on it. In other words, the pattern forming tool 30 is configured to rotate using the load that presses the metal M against the extrusion die 1.

[0045] As described above, when the top of the pattern forming tool 30 bites into the surface of the metal M extruded from the upper die 10, the pressing force is transmitted to the metal M, causing its surface to be pushed in the opposite direction from the pattern forming tool 30. At this time, as shown in Figure 4, a bending force P1 acts on the metal M due to the bending load from the pattern forming tool 30. However, the substantially trapezoidal projection 54 formed in the center of the back side of the metal M in the bearing portion 13 is hooked onto the inclined portion 14b of the projection forming portion 14, and a force P2 opposite to the bending load, i.e., the bending force P1, acts on it, thus preventing the metal M, i.e., the product member 50 with the pattern 53 formed on it, from being drawn towards the pattern forming tool 30. As shown in Figure 9, the product 50A formed in this way has a recessed pattern 53 formed on its surface, with recesses 53a and convex portions 53b continuing in the longitudinal direction, and a projection 54 formed along the longitudinal direction in the center of the back side. Therefore, the projection 54 can be given a reinforcing function, thus giving the product 50A strength.

[0046] If you want to change the amount of biting caused by the top of the pattern forming tool 30, for example, to reduce the amount of biting, rotate the position adjustment bolt 32 in the opposite direction to allow the mounting member 31 to slide within the mounting member installation hole 18. Next, pull the pattern forming tool 30 towards the position adjustment bolt 32, then insert a predetermined adjustment spacer 36 into the mounting member installation hole 18 so that the top of the pattern forming tool 30 has a predetermined amount of biting, and screw in the position adjustment bolt 32 until it contacts the side surface of the mounting member 31. In this state, as described above, operate the container 40 to supply the aluminum alloy to the extrusion die 1 and form an uneven pattern 53 on the surface of the metal M (product member 50) using the pattern forming tool 30.

[0047] In the above embodiment, the case in which an uneven pattern 53 is formed on the surface of a plate-shaped product member 50 has been described. However, the uneven pattern 53 can also be formed on the surface of a product member having a bent portion perpendicular to the surface at one end in the width direction of the flat surface portion, in the same manner as described above. In this case, as shown in Figure 5A, a bent molding portion 13b perpendicular to the surface portion is provided at one end in the width direction of the bearing portion 13. Furthermore, the shape of the projection molding portion 14 provided on the bearing portion 13 of the extrusion die 1 in the above embodiment is not limited to the above shape, as long as it is formed as a concave shape that bulges out from the back side molding surface 13a of the bearing portion 13 toward the tip, and may be as shown in Figures 6(a) to (d).

[0048] (a) A roughly T-shaped concave projection molding portion 14A is formed in the center of the back side molding surface 13a of the bearing portion 13, with both sides bulging horizontally from the back side molding surface 13a toward the tip (see Figure 6(a)). In other words, the projection molding portion 14A is formed in a roughly T shape with horizontal portions 14c that expand horizontally from both sides of the opening 14a provided in the back side molding surface 13a.

[0049] By forming it in this way, when the pattern 53 is formed on the surface of the product component 50, the roughly T-shaped projection 54A formed in the center of the back side molding surface 13a of the bearing portion 13 is hooked onto the horizontal portion 14c of the projection molding portion 14A, and an opposite force P2 acts against the bending force P1 caused by the bending load, thereby preventing the metal M (product component 50) from being caught on the pattern molding tool 30 side (see Figure 6A(a)).

[0050] (b) A roughly trapezoidal concave projection molding portion 14 is formed in the center of the back side molding surface 13a of the bearing portion 13, with both sides bulging in an inclined manner toward the tip from the back side molding surface 13a, and projection molding portions 14B are formed at both ends of the back side molding surface 13a, with the inner sides bulging in an inclined manner toward the tip from the back side molding surface 13a (see Figure 6(b)). In this case, the projection molding portion 14B is formed in a roughly trapezoidal shape having an inclined portion 14b that widens toward the tip from the inside of the opening 14a provided at both ends of the back side molding surface 13a.

[0051] By forming it in this way, when a pattern 53 is formed on the surface of the product component 50, the substantially trapezoidal projection 54 formed in the center of the back side molding surface 13a of the bearing portion 13, and the substantially trapezoidal projections 54B formed at both ends of the back side molding surface 13a, are hooked onto the inclined portion 14b of the projection molding portion 14 and the inclined portion 14b of the projection molding portion 14B. As a result, a force P2 acts in opposition to the bending force P1 caused by the bending load, preventing the metal M (product component 50) from being drawn into the pattern molding tool 30 (see Figure 6A(b)).

[0052] (c) A pair of protruding molded portions 14C are formed at both ends of the back side molded surface 13a of the bearing portion 13, with the inner side surface bulging in an inclined manner from the back side molded surface 13a toward the tip (see Figure 6(c)). In other words, the protruding molded portions 14C are formed in a substantially trapezoidal shape, having inclined portions 14b that widen from the inside of the openings 14a provided at both ends of the back side molded surface 13a toward the tip.

[0053] By forming it in this way, when a pattern 53 is formed on the surface of the product component 50, the substantially trapezoidal protrusions 54C formed at both ends of the molding surface 13a on the back side of the bearing portion 13 are hooked onto the inclined portion 14b of the protrusion molding portion 14C, and an opposite force P2 acts against the bending force P1 caused by the bending load, thereby preventing the metal M (product component 50) from being caught on the pattern molding tool 30 side (see Figure 6A(c)).

[0054] (d) A pair of protruding molded portions 14D are formed near both ends of the back side molded surface 13a of the bearing portion 13, with both sides bulging in an inclined manner toward the tip from the back side molded surface 13a (see Figure 6(d)). In other words, the protruding molded portions 14D are formed in a substantially trapezoidal shape, having inclined portions 14b that widen toward the tip from both sides of the opening 14a provided near both ends of the back side molded surface 13a.

[0055] By forming it in this way, when a pattern 53 is formed on the surface of the product component 50, the substantially trapezoidal protrusions 54D formed near both ends on the back side molding surface 13a of the bearing portion 13 are hooked onto the inclined portion 14b of the protrusion molding portion 14D, and an opposite force P2 acts against the bending force P1 caused by the bending load, thereby preventing the metal M (product component 50) from being caught on the pattern molding tool 30 side (see Figure 6A(d)).

[0056] In the embodiments (b) and (d) described above, the case in which the protruding molded parts 14 and 14D are formed in a substantially trapezoidal shape was described, but the protruding molded parts 14 and 14D may also be formed in a substantially T-shape similar to the protruding molded part 14A. In addition, in embodiments (b) and (c), the case in which the protruding molded parts 14B and 14C are formed in a substantially trapezoidal shape having inclined parts 14b that expand from the inside of the openings 14a provided at both ends of the back side molded surface 13a toward the tip was described, but the protruding molded parts 14B and 14C may also be formed in a substantially L-shape having horizontal parts that expand horizontally from the inside of the openings 14a provided at both ends of the back side molded surface 13a toward the tip.

[0057] Furthermore, the shape of the protruding molded portion may be other than those described above. For example, as shown in Figure 6B(a), it may be a roughly J-shaped, so-called hook-shaped protruding molded portion 14E that bends outwards from the back side molded surface 13a toward the tip, or as shown in Figure 6B(b), it may be a protruding molded portion 14F whose sides bulge outwards from the back side molded surface 13a toward the tip in a finely uneven manner. Note that in Figures 6B(a) and (b), parts of the protruding molded portions 14E and 14F are shown in enlargement, but as described above, the protruding molded portions 14E and 14F are provided at the center, both ends, or any position on both ends of the back side molded surface 13a.

[0058] The roughly J-shaped (hook-shaped) protrusion 54E formed by the protrusion forming part 14E as described above, and the protrusion 54F having fine irregularities 54f on both sides formed by the protrusion forming part 14F, are caught on the protrusion forming parts 14E and 14F when a pattern is formed on the surface of the product member 50, thereby preventing the metal M (product member 50) from being caught on the pattern forming tool 30.

[0059] In the above embodiment, the case in which a recessed pattern 53 is formed on the surface of the product member 50, in which recesses 53a and protrusions 53b are continuous along the longitudinal direction, was described. However, by changing the pattern forming tool 30, it can also be applied to the case in which a continuous recessed diamond pattern 55 is formed on the surface of the product member 50, inclined with respect to the longitudinal direction, in both the longitudinal direction and the width direction perpendicular to the longitudinal direction, as shown in Figure 10. In this case, each diamond pattern 55 is a recess, and the space 56 between adjacent diamond patterns 55 is a protrusion. Furthermore, in the diamond shape of the diamond pattern 55, the longer of the two diagonals of the diamond is continuously arranged along the longitudinal direction of the surface.

[0060] Furthermore, the patterns formed on the product component 50 are not limited to the concave-concave pattern 53 or diamond pattern 55 in which the concave 53a and convex 53b are continuous, but may also be formed in other shapes, such as circular patterns, triangular patterns, square patterns, polygonal patterns, etc.

[0061] According to the extrusion die for forming patterned products configured as described above, when forming an uneven pattern on the surface of the product member 50, the protrusions 54, 54A, 54B, 54C, 54D, 54E, and 54F formed on the back side of the product member 50 in the bearing portion 13 are engaged with the protrusion forming portions 14, 14A, 14B, 14C, 14D, 14E, and 14F, thereby preventing the product member 50 from being caught on the pattern forming tool 30. As a result, material waste and wasted work time can be eliminated, and productivity can be improved. In addition, the protrusions 54 formed along the longitudinal direction on the back side of the product member 50 can be given a reinforcing function, thereby improving the strength of the product member 50.

[0062] In the above embodiment, the case where the product material is an aluminum alloy was described, but the product material is not limited to an aluminum alloy. It may also be a synthetic resin such as a general-purpose plastic like PP (polypropylene) or PE (polyethylene), or an engineering plastic like PA (polyamide). [Explanation of Symbols]

[0063] 1. Extrusion die (extrusion die for molding patterned products) 10 Upper die 12 Metal introduction recess 13 Bearing section 13a Reverse side molding surface 14,14A,14B,14C,14D,14E,14F Projection molding part 14a opening 14b Slope 14c horizontal section 15 Upper guide section 16 Space 18 Holes for mounting mounting components 19 Through hole 20 lower die 22 Lower guide section 30 Pattern forming tools 31 Mounting components 32 Position adjustment bolts 33 Bearings 34 Shaft section 36 Adjustment Spacers 50 Product Components 53. Textured pattern 54,54A,54B,54C,54D,54E,54F protrusion 55 Diamond pattern M Metal

Claims

1. An extrusion die for forming patterned products, which forms a pattern on the surface of a product component formed from a thermoplastic material continuously extruded from the material supply side, The apparatus comprises an upper die into which the thermoplastic material is introduced, a lower die that supports the upper die, and a pattern forming tool that rotates with the movement of the product material to form the pattern on the surface of the product material. The upper die described above has a bearing portion for molding the thermoplastic material into the shape of the product material, and a projection molding portion is provided on the back side molding surface of the product material in the bearing portion for forming a projection that prevents the product material from getting caught in the pattern molding tool by engaging. An extrusion die for molding patterned products, characterized by the following features.

2. An extrusion die for patterned products according to claim 1, The extrusion die for molding patterned products is characterized in that the above-mentioned protruding molding portion is formed in a concave shape that bulges out from the back side molding surface of the bearing portion toward the tip.

3. An extrusion die for forming patterned products according to claim 1, An extrusion die for molding patterned products, characterized in that the above-mentioned protruding molding portion is provided in the center of the back side molding surface of the bearing portion.

4. An extrusion die for forming patterned products according to claim 1, The extrusion die for molding patterned products is characterized in that the above-mentioned protruding molding portion is provided at the center of the back side molding surface of the bearing portion and at both ends of the back side molding surface.

5. An extrusion die for forming patterned products according to claim 1, The extrusion die for molding patterned products is characterized in that the above-mentioned protruding molding portion is provided at both ends or near both ends on the back side molding surface of the bearing portion.

6. An extrusion die for molding patterned products according to any one of claims 1 to 5, The pattern forming tool is disposed on the lower side of the bearing portion in the upper die so as to be rotatable and so as to be able to adjust the pressure toward the product component side, characterized in that it is an extrusion die for forming patterned products.

Images