JPH0572404U - Molding structure of wood base material without terminal burr - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] We propose a mold structure for wood-based substrates that can eliminate manual flash finishing. [Constitution] In a molding die 1 for stamping a wooden base material by a lower mold 7 and an upper mold 2 to part a surplus material of the same wooden base material, a molding convex portion 4 is formed on the lower surface of the upper mold 2. The lower die 7 is formed with an opening 9 that fits into the molding projection 4, and a molding recess 8 is formed in an undercut shape continuously from the peripheral edge of the opening 9. With the convex portion 10 forming the upper opening and the molding convex portion 4 of the upper mold 2, the surplus material of the wood-based material can be parted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a mold for a wood-based material, and more particularly to the structure of a mold that does not form so-called burrs at the ends.

[0002]

[Prior Art]

 In order to mold a wood-based material into a relatively flat shape, usually, a quantity of wood-based material in excess of the required amount is pressed and molded with a heated mold. In this case, it is molded by a molding die as shown in FIGS. In such a molding die, the wooden base material is pushed into the molding recess of the lower mold, and the surplus material is provided in the upper mold and separated into the end treatment recess. Then, this separation (parting) is performed between the mating surfaces of the upper mold and the lower mold for forming the molding space.

If the mating surfaces (so-called parting surfaces) are in close contact with each other during molding, the surplus material and the molded body can be completely separated, but the mold is thermally expanded by the heating of the molding die. Complete separation of the body and the extra material was technically very difficult. Therefore, at present, there is only a molding method involving a separation end (so-called burr) as shown in FIGS. 4 and 5.

In the molding method using the molding die 21 shown in FIG. 4, a molding space is constituted by the molding recess 23 formed in the lower mold 22 and the pressing surface 25 of the upper mold 24. Therefore, the parting portion 26 for separating the end material and the molded body is formed by the parting surface 23a on the outer periphery of the molding recess 23 and the parting surface 25a on the outer periphery of the pressing surface 25 of the upper mold 24. Therefore, the burr 26 was formed on the entire circumference of the molded body in the outward direction.

Further, in the molding method using the molding die 27 of FIG. 5, the molding concave portion 28 is formed deeper than the shape of the molded body, and the pressing surface of the pressing portion protruding downward from the upper mold on the upper side of the molding concave portion 28. The position of 29 forms a molding space. Therefore, in the parting part, the parting surface of the lower mold is the inner peripheral surface above the molding recess, and the partitioning surface of the upper mold is formed by the outer peripheral surface of the pressing part. As a result, the burr 26 was formed upward on the entire circumference of the molded body.

[0006]

[Problems to be solved by the device]

 However, since the burrs 26, 30 formed by the above-described molding method are located on the outer peripheral end of the molded body, when the PVC skin material or the fabric skin material is wrapped around the wood molding base material by vacuum molding or adhesion, It had a rough terminal and looked bad. For this reason, the burr around the entire circumference of the molded body must be manually processed with a file or a paper, which takes time and labor.

Therefore, an object of the present invention is to propose a structure of a wood-based molding die capable of eliminating manual burr finishing.

[0008]

[Means for Solving the Problems]

 In the present invention, as a means for solving the above technical problems, in a molding die for stamping a wooden base material with a lower die and an upper die to part the surplus material of the same wooden base material, A molding projection is formed on the lower surface of the upper mold, an opening is formed in the lower mold to fit the molding projection, and a molding recess is formed in an undercut shape continuously from the periphery of the opening. A mold for forming a wood-based base material without terminal burrs, which is formed so that the residual material of the wood-based base material can be parted by the projection forming the upper opening of the molding recess and the molding projection of the upper mold. Created the structure.

[0009]

[Action]

 According to the above structure, the lower die has an opening portion that fits into the upper mold forming convex portion, and an undercut-shaped forming concave portion is formed below the opening portion, so that the opening portion is formed into the forming concave portion. Will be formed to be slightly smaller than the outer circumference. For this reason, the molding space is formed by the lower part of the molding concave part and the lower part of the convex part of the upper mold, which have an undercut part and wrap around upward, and form the outer peripheral surface and the opening part of the molding convex part. The surplus material of the wood-based base material is parted by the inner peripheral surface of the convex portion. This part of the partition is located inside the outer peripheral edge of the molding space. Therefore, the burr (combined burr) formed along the direction of the parting surface at the parting portion is always formed inside the outer peripheral end of the molded body.

[0010]

【Example】

 The structure of the mold 1 shown in FIG. 1 will be described below as an embodiment of the present invention. The molding die 1 comprises an upper die 2 and a lower die 7 as in the conventional case. The upper die 2 is arranged facing the lower die 7 and is vertically movable by a driving device (not shown). A terminal escape recess 3 is formed along the outer periphery of the lower surface 2a of the upper mold 2 so as to allow the surplus wood-based base material 17 to escape so as not to hinder the formation. A molding convex portion 4 having a predetermined shape is formed vertically downward from the escape concave portion 3 toward the center of the upper mold 2. The molding convex portion 4 projects below the lower surface 2a of the upper mold 2, and is fitted and set in the opening 9 of the lower mold 7 during molding. The lower surface of the molding convex portion 4 serves as a pressing surface 5.

The lower die 7 is placed on a base, and an opening 9 into which the molding convex portion 4 of the lower die 2 is fitted is formed on the upper surface of the lower die 7. Further, a molding recess 8 is formed so as to be continuously carved from the lower peripheral edge of the opening 9 in an undercut shape in the outer peripheral direction of the opening 9. As a result, the cross-sectional shape of the lower mold 7 is such that the upper opening 9 is narrowed and a space is formed by the molding recess 8 which is bulged downward.

The surface of the molding recess 8 is a molding surface 11. The molding surface 11 forms a gentle curved surface from the lower edge of the opening 9 and extends obliquely downward and is continuous with the bottom surface of the molding recess 8. .. Thus, the depth D of the undercut portion 11a from the lower end edge of the opening 9 is set to 2 to 3 mm. It should be noted that the undercut is not the entire circumference of the opening 9 but only a predetermined portion. That is, it is formed only on the outer periphery where burr is not desired to be formed.

Further, by forming the molding concave portion 8 in an undercut shape, the convex portion 10 is formed and the opening 9 is formed by the convex portion 10. In this embodiment, as a result, such convex portions 10 are formed in three directions.

By fitting the molding convex portion 4 of the upper mold 2 into the opening 9 of the lower mold 7 thus formed, the pressing surface 5 that is the lower surface of the molding convex portion 4 of the molding upper mold 2 is pressed. And the molding surface 11 that is formed by carving below the opening 9 forms a molding space 12 that matches the outer shape of the molded body 16. That is, since the molding surface 11 of the lower die 7 includes the undercut portion 11a, the molding surface 11 extends to the outer peripheral portion on the upper side of the molding 16 while the pressing surface 5 covers the entire upper surface of the molding space 12. It is not to cover, but only the outer peripheral part of the molding surface 11 of the lower mold 7 which has wrapped around upward is covered and pressed together. The parting of the extra material 17 is performed by the outer peripheral surface 6 of the molding convex portion 4 and the inner peripheral surface 10a of the convex portion 10. That is, the outer peripheral surface 6 and the inner peripheral surface 10a are parting surfaces, respectively.

Next, a process of molding a wood-based base material using the molding die 1 will be described. The wood-based base material may be mixed uniformly with a predetermined wood fiber or other additives, and may be mixed with the same amount by increasing the amount of wood fiber at a predetermined ratio. Consists of. In such two types of wood-based base material, a base material containing a large amount of a predetermined amount of wood fibers is arranged in the outer peripheral direction 15a corresponding to the position where the undercut portion 11a is formed, and the other parts are A mat-shaped wood-based base material 15 is loosely formed into a predetermined shape in a mat shape with a base material having a normal mixing ratio. The reason why it is formed into a mat is because the formability is taken into consideration. It should be noted that this amount increase is performed within a range in which a predetermined strength and moldability are maintained. Further, the wood-based base material is usually formed into a mat shape in a predetermined shape so as to be easily formed prior to forming.

The mat-like wood-based substrate 15 is placed and set on the upper surface of the lower mold 7 heated to a predetermined temperature so as to cover the opening 9. Then, after the molding convex portion 4 of the upper mold 2 is set above the lower mold 7 so that it can be fitted into the opening 9 of the lower mold 7, the upper mold 2 is lowered. The pressing surface 5 of the upper mold 2 comes into contact with the mat-like wood-based material 15 and is gradually pressed into the molding recess 8. Further, the extra mat-shaped wood-based base material 15 is separated by the outer peripheral surface 6 of the molding convex portion 4 and the inner peripheral surface 10a of the convex portion 10.

At this time, since the outer peripheral side 15a of the mat-like wooden base material 15 contains a large amount of wood fibers, the outer peripheral side 15a has high fluidity. Therefore, when the mat-like wood-based material 15 is separated by the partitioning surfaces 6 and 10a, the mat-like wood-based material 15 collapses and the wood is sufficiently formed in the undercut portion 11a below the lower edge of the protrusion 10. The system base material 15 can be spread.

In this way, with the sufficient amount of the wood-based base material 15 existing in the entire molding space 12, the pressing surface 5 of the upper mold 2 reaches a predetermined position, and the molding surface 11 of the lower mold 7 is formed. A predetermined molding space 12 is formed, pressed and molded. At this time, since a sufficient amount of the wood-based material 15 is also present in the undercut portion 11a, the partial pressure of the pressure of the upper mold 2 also acts on this portion. Therefore, this portion 11a can be molded into a predetermined shape and strength.

Since the undercut portion 11a is a part of the molding surface 11 of the lower mold 7, the portion where the molding surface 11 and the pressing surface 5 of the upper mold 2 are brought together is the upper end of the undercut portion 11a. In the department. For this reason, the parting portion 18 of the wood-based base material 15 by the upper and lower mold parting surfaces 6 and 10a is positioned slightly inside the upper surface of the molded body 16. That is, the parting portion 18 is always located inside the outermost portion of the molded body 16 by the depth D 1.

Further, since this parting portion 18 is formed by the two vertical parting surfaces 6 and 10a, the wood-based material 15 is directed upward to the upper convex portion of the undercut portion 11a on the upper surface of the molded body 16. Are separated 17 and burr 19 is formed.

Thereafter, the upper die 2 is moved upward and the molded body 16 is slightly bent to remove it from the undercut portion 11 a, and the upper die 2 is taken out from the lower die 7.

In the molded body 16 thus formed, unlike the conventional case, the burr 19 is not formed on the outer peripheral convex portion of the molded body 16. Therefore, when attaching the epidermis, it is possible to generate irregularities in a portion that cannot be seen from the surface. Further, the undercut portion 11a has the same strength as the conventional one, and a slight roundness appears on the outer peripheral side, but this does not pose any problem as a product. Further, even if the shape and size of the burr 19 are changed due to heat expansion of the mold, the position itself where the burr 19 is formed is not a problem for the attachment and appearance of the epidermis, which causes a serious problem on the work surface. Don't

The configuration of the molding space 12 is not limited to this embodiment, and as shown in FIG. 3, for example, the central portion of the pressing surface 5 may be extended slightly below the parting surface 6 to form a parting part. It is also possible to form a slope 5a between the surface 6 and the surface 6. Therefore, the pressure from the upper mold 2 is further divided into the undercut portion 11a. Further, the present invention is applied not only to the burr 19 on the outer peripheral end of the molded body 16 but also to the burr on the outer periphery of the hole penetrating one molded body by similarly forming the molding space. can do.

[0024]

[Effect of the device]

 According to this invention, an opening is formed in the lower mold for fitting the molding protrusion of the upper mold, and a molding recess is formed in an undercut shape from this opening to partition the surplus material of the wood-based substrate. Since the outer peripheral surface of the molding convex part and the inner peripheral surface of the convex part that forms the opening are performed, the burr is formed on the inner side only by the depth of the undercut part from the outermost part of the molded body. become. Therefore, one side (surface side) of the molded body is always smoothly molded. Therefore, it is possible to eliminate manual deburring prior to the work of attaching the epidermis, and it is possible to reduce the time and cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional view (a) in a state where a wood-based substrate is molded by a molding die and a cross-sectional view (b) of a molded body taken out from the molding die.

FIG. 2 is a cross-sectional view of the upper and lower molds and a mat-shaped wood-based substrate.

FIG. 3 is a cross-sectional view showing a molding state by an upper die in which the shape of the pressing surface of the pressing portion is changed.

FIG. 4 is a cross-sectional view showing a conventional molding die and molded body.

FIG. 5 is a cross-sectional view showing another conventional molding die and molded body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Mold 4 ... Mold convex part 2 ... Upper mold 7 ... Lower mold 8 ... Mold concave 9 ... Opening 10 ... Projection

Claims (1)

[Scope of utility model registration request] 1. A molding die for stamping a wood-based material with a lower mold and an upper mold to part a surplus material of the same wood-based material, wherein a molding convex portion is formed on a lower surface of the upper mold, An opening is formed in the lower mold so as to fit with the molding projection, and a molding recess is formed in an undercut shape continuously from the peripheral edge of the opening, and a projection forming an opening above the molding recess is formed. A terminal burr-free molding die structure of a wood-based material, which is configured so that the residual material of the wood-based material can be parted by the molding part and the molding convex portion of the upper mold.