JPH0776022A - Mold for corner - Google Patents

Abstract

PURPOSE:To improve an operation considerably and to improve also the durability of a mold for a corner by fitting an auxiliary center core part to a thin plate part for a middle die so that it can be moved in the longitudinal direction of hollow extrusion molding parts which are inserted into a main center core. CONSTITUTION:An auxiliary center core part 30 is fitted to a thin plate part 41 for a middle die so that it can be moved only in the longitudinal direction of a main center core 42. While hollow extrusion molding parts 1a and 1b are joined to the opposite ends(respectively, therefore, the auxiliary center core part 30 is displaced upward together with a main center core part 40 after a top force is removed, and a product is extracted from a cavity part 11 of a bottom tool 20 and the parts 1a and 1b on the occasion when the product is released from a mold after an L-shaped corner part 11 is die-molded. The product being pulled, then, a main center core part 40 is extracted from the product and separated therefrom and then the product is displaced and extracted from an auxiliary center core 31 for molding the corner part. During this operation, the auxiliary center core is held on the thin plate part 41 for the middle die by bolts 35, 35 and need not be supported by hand.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for manufacturing weather strips for automobiles and the like, and is for corners in which hollow extruded parts are joined to both ends of the corner part and at the same time an L-shaped corner part is formed. It is about molds.

[0002]

2. Description of the Related Art A description will be given with reference to FIGS. In the figure, one of the median lines from the apex angle of the isosceles triangle is filled, but the filled side represents the molding part, and the non-filled side represents the extrusion molding part. . Conventionally, a slit for extracting a core from the hollow extruded parts 1a and 1b is used as a corner die used to join the hollow extruded parts to the left and right ends, and at the same time, to mold the L-shaped corner part. In the case where the core is not provided, the core divided in two is used in order to facilitate the extraction of the core. That is, 20 is a rectangular lower die as viewed from above, and the ends of the two hollow extruded parts 1a and 1b on the left and right are
The lower cavities 2a and 2b for the extrusion molding part, which are set so that the extension lines intersect with each other, are formed, and between the lower halves 2a and 2b of the cavities, the lower half cavities for the L-shaped corners are formed. 21 is formed.

Reference numeral 30 denotes an auxiliary core portion for forming a short columnar corner portion which is partially inserted into an end of one hollow extruded portion 1a and is arranged in the lower half portion 2a of the extruded portion. An auxiliary thin plate portion 32 is provided so as to project from the other end of the auxiliary core 31, and a handle 33 is attached to the base end of the auxiliary thin plate portion 32.

Reference numeral 40 denotes a main core portion to be combined with the auxiliary core portion 30, the base end of which is attached to the lower die 20 and a horizontal hinge shaft 50.
At the tip of the middle-sized thin plate portion 41 rotatably supported via, one end is inserted into the end of the other hollow extruded portion 1b, and the rest is placed in the corner cavity lower half portion 2b. Further, the other end is brought into contact with the back surface of the auxiliary core 31 and a portion corresponding to the auxiliary core 31 is missing, and an L-shaped main core 42 having a short side is joined.

Further, the lower die 20, the auxiliary core 30,
In the main core portion 40, the upper half portions 6a, 6b for the extrusion molding portion are provided.
And a rectangular upper mold 60 having an L-shaped corner upper half 61 for the corner and viewed from above.

However, when the hollow extruded parts are joined to the left and right ends of the mold and the L-shaped corners are molded at the same time when the product is released from the mold,
After removing the upper mold 60, the auxiliary core 30 is displaced upward together with the main core 40 to move the product 10 into the cavity 1 of the lower mold 20.
1, 1a, 1b, the auxiliary core 30 is pushed together with the product in the direction of arrow A in FIG. 2, the product is separated from the main core 40 as shown in FIG. 3 is displaced in the B direction so as to be pulled out from the product 10 as shown in FIG. 4, and during that time, the auxiliary center portion 30 needs to be operated by holding the handle 33 by hand, which is poor in workability. There is a problem.

[0007]

The problem to be solved is that in the above-mentioned conventional corner mold, the auxiliary center portion 30 needs to be operated by holding the handle 33 by hand when releasing the product. Yes, the workability is poor.

[0008]

A means for solving the problems will be described with reference to FIGS. The present invention relates to a mold used to mold hollow L-shaped corner portions 11 at the same time as joining the hollow extruded molding portions 1a and 1b to the left and right ends, respectively.
Lower mold 20 having an L-shaped corner cavity lower half portion 21 between extrusion molding portion cavity lower half portions 2a and 2b for setting the ends of the extrusion molding portions 1a and 1b, one hollow at one end Auxiliary thin plate portion 32 protruding from the other end of a short pillar-shaped corner molding auxiliary core 31 which is inserted into the end of the extrusion molding section 1a and is arranged in the lower half 2a of the extrusion molding section. The middle core portion 30 and the lower die 20 are inserted into the free end of the thin plate portion 41 for the middle die, which is rotatably attached via the horizontal hinge shaft 50, to the end portion of the other hollow extruded portion 1b, and the remaining portion is left. A main core 4 which is arranged in the lower half 2b of the cavity for a corner portion and lacks a portion corresponding to the auxiliary core 31.
In a mold provided with a main core portion 40 in which 2 are joined,
The auxiliary core portion 30 is attached to the middle-sized thin plate portion 41 so as to be movable in the longitudinal direction of the hollow extruded portion 1b into which the main core 42 is inserted.

[0009]

EXAMPLE An example will be described. At the same time when the hollow extruded parts 1a and 1b are joined to the left and right ends, respectively,
The mold of the present invention used for molding the character-shaped corner portion 11 is configured as follows. Reference numeral 20 denotes a rectangular lower mold as viewed from above, and the lower half of the hollow portion for the extrusion molding portion is provided to set the ends of the two hollow extrusion molding portions 1a and 1b on the left and right sides so that the extension lines intersect each other. 2a and 2b are formed, and between the cavity lower half portions 2a and 2b,
When viewed from above, the cavity lower half portion 21 for the L-shaped corner portion that forms the L-shaped corner portion 11 is formed. Reference numeral 30 denotes an auxiliary core portion, one end of which is one hollow extrusion molding portion 1a.
The lower half 2a of the cavity for extrusion molding while being inserted into the end of the
An auxiliary thin plate portion 32 is projectingly provided on the other end of the auxiliary pillar 31 for forming a corner portion having a short columnar shape. Reference numeral 40 denotes a main center portion to be combined with the auxiliary center portion 30, and the base end is connected to the lower die 20 via a horizontal hinge shaft 50 so as to be undulated, and the one end is the other end. Is inserted into the end of the hollow extruded part 1b, the rest is placed in the lower cavity half 21 for the corner, and the other end is inserted into the auxiliary core 3
1 Auxiliary core 3 which is formed so as to contact the back surface
1 L-shaped main center core 42 with one side short, with one part missing
Are combined.

In the present invention, in particular, the auxiliary core portion 30 is bolted to the auxiliary thin plate portion 32 so as to be movable in the longitudinal direction of the hollow extruded portion 1b into which one end of the auxiliary core 31 is not inserted. 35, 35 through the middle-sized thin plate portion 4
It is attached to 1. This will be described in more detail. On the side of the middle thin plate portion 41 of the auxiliary thin plate portion 32, a groove 36 having a width that allows the screw rod 38 portion of the bolts 35, 35 but not the head portion 39 to pass is formed outside the groove 36. A groove 37 through which the head 39 is passed is provided in the.

Further, the upper half portions 6a and 6b for the extrusion molding portion and the upper half portion 61 for the L-shaped corner portion are formed on the lower die 20, the auxiliary core portion 30, and the main core portion 40, respectively. Stack the rectangular upper mold 60 as viewed from above.

To explain the operation, the auxiliary core portion 30 is arranged in the longitudinal direction of the main core 42 (direction of arrow C in FIG. 8).
Since it is attached to the middle die thin plate portion 41 so as to be movable only, the hollow extrusion molding portions 1a and 1b are joined to both ends, and at the same time, the product is released from the mold after the L-shaped corner portion 11 is molded. In doing so, after removing the upper mold 60, the main center core part 40 and the auxiliary center core part 30 are displaced upward, and the product 10
From the cavities 11, 1a, 1b of the lower mold 20, draw the product 10 in the direction of arrow C in FIG. 8 as shown in FIGS. 8 to 9, and remove the main center core 40 from the product 10 as shown in FIG. After the product is extracted and separated, the product is displaced as shown by an arrow D in FIG. 9 so as to be extracted from the auxiliary core 31 for forming the corner portion.
Since it is held by the middle-size thin plate portion 41 by 35, it is not necessary to support it by hand, and the workability is remarkably improved and the durability of the mold is also improved.

The present invention also provides a hollow extruded part 1a,
It is extremely useful for a multi-product or the like having no slits in 1b because it can be operated while holding both extrusion molding parts 1a and 1b by hand.

[0014]

Since the present invention is constructed as described above,
After joining the hollow extruded parts 1a and 1b to the left and right ends, respectively, and at the same time molding the L-shaped corner part 11, it is necessary to support the auxiliary core part 30 by hand when releasing the product from the mold. The workability is remarkably improved and the durability of the mold is also improved.

[Brief description of drawings]

FIG. 1 is a plan view of a conventional example.

FIG. 2 is a schematic view of a main part of FIG.

FIG. 3 is a state diagram in the middle of taking out a product from the state of FIG.

FIG. 4 is a state diagram in which product removal is completed from the state of FIG.

5 is a sectional view taken along line PP of FIG. 1 and SS of FIG.

6 is a cross-sectional view taken along the line QQ of FIG. 1 and the line TT of FIG. 7.

FIG. 7 is a plan view of the present invention.

FIG. 8 is a schematic view of a main part of FIG.

9 is a diagram showing a state in which a product is being taken out from the state shown in FIG.

FIG. 10 is a state diagram in which product removal is completed from the state of FIG. 9;

FIG. 11 is a side view of the present invention.

12 is a sectional view taken along line HH of FIG.

13 is a sectional view taken along line KK of FIG.

[Explanation of symbols]

1a, 1b Hollow extrusion molding part 2a, 2b Extrusion molding part cavity lower half part 6a, 6b Extrusion molding part cavity upper half part 10 Product 11 L-shaped corner part 13 Slit 20 Lower mold 21 For L-shaped corner part Lower half of the cavity 30 Auxiliary core 31 Auxiliary core for forming corners 32 Auxiliary thin plate part 33 Handle 35 Bolts 36, 37 Groove 38 Screw rod 39 Head 40 Main center core 41 Medium size thin plate part 42 Main center core 50 Horizontal Hinged shaft 60 Upper die 61 Cavity upper half part for corner A Direction of removing auxiliary core together with product from main core in conventional technology B Direction of removing auxiliary core from product in conventional technology C Mainly in the present invention Direction of taking out the auxiliary core from the core together with the product D Direction of taking out the product from the auxiliary core in the present invention

Claims (1)

[Claims] 1. A mold for use in molding an L-shaped corner portion (11) at the same time as joining hollow extruded portions (1a, 1b) to the left and right ends, respectively. , 1b) for setting the ends of the cavity for the extrusion molding part (2a, 2b) between the lower half of the cavity for the L-shaped corner (21).
0), one end is inserted into the end of one hollow extruded part (1a) and is placed in the lower half part (2a) of the extruded part, which is a short columnar corner auxiliary auxiliary core (31). Auxiliary core portion (30) having an auxiliary thin plate portion (32) protruding from the other end portion thereof, and a thin plate portion for a middle die (30) rotatably attached to a lower die (20) through a horizontal hinge shaft (50). 41) is inserted into the free end of the hollow extruded part (1b) on the other side and the rest is the lower half part (2b) of the cavity for the corner part.
A corner mold comprising a main core portion (40) arranged inside and having a main core portion (42) lacking a portion corresponding to the auxiliary core portion (31) connected to the auxiliary core portion (40). Three
0) is movable in the longitudinal direction of the hollow extruded part (1b) into which the main center core (42) is inserted, and the thin plate part (4) for medium dies is used.
Corner mold attached to 1).