JPH06297468A - Molding die - Google Patents

Abstract

PURPOSE:To simplify the structure of a mold without using die set, use some part of the mold for mold releasing and facilitate air ejection. CONSTITUTION:The lower outer periphery of an upper mold 30 and the upper hole of a lower mold 40 are made so as to have tapered surfaces 34 and 44 respectively and the lower part of a core 50 and the lower part of the lower hole of the lower mold 40 are also made so as to have tapered surfaces 41 and 51 respectively so as to allow to position their centers. Further, by limiting the amount of the upward movement of the lower mold 40 develops by the restoring force of a packing 58 inserted in the packing groove 57 of the fixed side mounting plate 52, by means of blocks 60, which are provided at the proper positions of a fixed side mounting plate 52 along the outer periphery of the mounting part 59 of the lower mold 40, a molded article is lifted from the core 50 through the movement (rising) of the lower mold 40 and ejected by means of air supplied through air holes 54 and 55.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold suitable for molding a synthetic resin container, and more particularly to an improvement of a mold for molding a container such as a lunch box or a heavy box.

[0002]

2. Description of the Related Art Containers made of synthetic resin have been applied to bowls, bento boxes or heavy boxes in place of wooden lacquer ware containers, and have recently become prosperous with the development of paints replacing lacquer. .

Even if the lunch box or the heavy box is covered with a lid, it cannot be fixed in a liquid-tight manner with the conventional one because it is easily removed. Therefore, the applicant of the present application has proposed and implemented a container in Japanese Patent Application No. 4-60889, in which the lid is firmly fixed and the shape of the container facilitates release from the mold.

That is, the outline of the shape will be described with reference to FIGS. 2 and 3. The locking portion 2 is formed on the side portion of the container 1 on the side of the bottom portion 11 over the entire circumference and is formed of a thick portion protruding outward.
And an outer portion 5 which rises from the upper step portion 3 of the locking portion 2 and whose outer peripheral side is gently inclined inward toward the upper side,
An outer edge portion 7 which rises from the outer portion 5 and whose outer peripheral side inclines outward in an upward direction is provided, and the engaging portion 2, the outer portion 5 and the outer edge portion 7 are continuously formed, and the engaging portion 2 is provided. The outer edge portion 7 is configured such that the wall thickness gradually decreases from the upper step portion 3 toward the upper edge 8 of the outer edge portion 7, and the lid 1 (not shown) is removed to open the container 1 in the open state. The outer periphery of the upper edge 8 is located inward from the rising start point 4a of the outer circumference of the outer side portion 5, and the outside portion 5 from the rising start point 4a to the starting point 6a has a draft in the drawing direction from the lower mold, The outer edge portion 7 from the starting point 6a to the upper edge 8 is provided with a gradient that is opposite to the drawing direction of the lower mold on the outer circumference of the container 1.

FIG. 3 shows a case where the outer shape is a half moon shape in a plan view, but there are almost square and other polygonal shapes.

Then, the rigidity of the thick portion on the outer periphery of the bottom portion 11,
The elasticity due to the thin portion around the outer edge portion 7 and the upper edge portion 8 and the contraction due to the cooling during the molding of the synthetic resin are used to allow the air to be projected.

The air ejection method is shown in FIG. 5 for the product "bucket" as an example. (Published by Shoichiro Ishikawa, January 7, 1983, the first edition, 10 prints, author: Junichiro Ishikawa, Nikkan Kogyo Shimbun, Inc.
Page 194 Figure 9 ・ 11 Explain by strip ring and air protrusion) 2) Molded product (bucket here)
8 is a state in which the mold cavity is filled with molten synthetic resin material, clamped and compressed, and cooled, and then the upper die (not shown) is lifted to open the die. When the ejector pin 22 (not shown) is advanced in the direction of the arrow by an actuator, the ejector pin 24 fixed to the ejector plate 23 pushes up the strip ring 20, so that the bucket 28 is separated from the core 21 and the ejector pin 22 advances. Since the bucket 28 is lifted by the amount of operation, a gap 26 is formed between the tapered inner diameter portion of the bucket 28 and the tapered outer diameter portion of the core 21, and compressed air (hereinafter, also simply referred to as air) from the air hole 25. ) Is supplied so as to project.

As shown in FIG. 5, a die set is generally used as a die, and a guide pin 27 is fixed to one side of the die, and the other side (here, the upper die side, It is guided by a guide post (not shown) so that the centers of the upper die and the lower die coincide with each other.

In these mold releasing operations, it is effective to shorten the stroke length for operating the strip ring 20 as much as possible because the molded product 28 is not buckled.

In forming the bucket 28, since the shape is simple and the draft is in one direction, the strip ring 20 can be of a sufficient size and the upper die can be manufactured as one die. . Therefore, the upper die can be lifted up by the stroke of the molding machine and the strip ring 20 can be operated sufficiently. However, as described with reference to FIGS. 2 and 3, when the outer portion 5 and the outer edge portion 7 have opposite draft angles in opposite directions, the upper die needs to be a split die. Come out. When this split type is used, the parting line P
Becomes important.

Therefore, the upper mold is the parting line Pa in FIG. 2, the upper mold is on the bottom 5 side, and the lower mold is the locking portion 2.
The outer portion 5, the outer edge portion 7, and the upper edge 8 can be molded from the above, and a strip ring formed with a plate thickness approximately the same width as the upper edge 8 of the molded container 1 is used, and the lifting stroke of the strip ring is 0. It was set to 0.5 mm, and the container 1 was released from the core mold. However, since the plate thickness of the upper edge 8 is as thin as about 3 mm, and since the strip ring has the same thickness, the outer edge of the upper edge 8 can be locally damaged and the stop ring can be quickly removed. It began to transform into the need for replacement.

That is, the life of the strip ring lowers the productivity and raises the production cost, and since the die set type is adopted as explained in FIG. 5, the number of parts constituting the die is reduced. However, since the precision of each of the parts is required, the mold itself becomes expensive, which is also a factor of increasing the production cost.

[0013]

As described above, the container 1
Has an engaging portion 2 on the outer peripheral side thereof, and has an outer side portion 5 and an outer edge portion 7.
When the draft and the draft exist in opposite directions, the strip ring cannot be effectively used. However, it is possible to take out the molded product by further dividing the lower die. However, in addition to the fact that the divided die has the same number of parts as the die set die and the operation method of the divided die becomes complicated. As a result, the divided parting line is left on the outer peripheral side of the container 1 after molding, which lowers the commercial value and necessitates manual finishing, which is not preferable.

Therefore, the inside of the die is a core (male type),
The outer bottom 11 and the bottom edge (thread edge) 12 are used as upper molds, and the parting line P is set as the lower part of the locking part 2 (upper part in the lower mold of the mold), and the upper edge 8 is higher than the parting line P.
To form a lower mold, the lower mold is configured to be movable, and the container 1 is moved to move the lower mold to separate the molded product from the core, thereby simplifying the mold and stripping the lower mold. It also has the function of a ring.

[0015]

According to the present invention, an upper die, a lower die, and a core constitute a set of molding dies, the upper die being fixed to a movable side mounting plate, and the core being fixed side. While fixing to the mounting plate, the lower mold is fixed to the core,
In a die in which the upper die is joined to the lower die to form a cavity with the core by closing the die, the fixed side mounting plate (52) is centered on the core (50) and the core (50 ) The packing groove (5
7) is provided, the side of the fixed side mounting plate (52) is close to the outer peripheral side of the core (50), and the packing groove (5) is provided.
7) air holes (54, 55) penetrating inward from the core, and the lower die (40) is provided on the lower outer periphery of the core (50).
The lower parts of the lower mold are fitted with tapered surfaces (41, 51) respectively, and the packing (58) inserted into the packing groove (57) and the air hole (55) are fitted on the bottom surface of the lower mold (40). ) And the blocks (60) are fixed to the fixed side mounting plate (52) at a plurality of positions to pack (58).
The lower mold (40) is attached so as to have a crushing allowance, and a taper hole (44) is provided above the lower mold (40) to be positionally locked by being joined to the upper mold (30). ,
A tapered surface (3
4) is formed so as to fit into the tapered hole (44) of the lower mold (40), and the upper mold (30) is formed by the operation of the movable plate.
Comes into contact with the lower mold (40) and is closed and clamped,
The packing (58) is crushed to move the lower mold (40) downward so that the bottom surface is brought into close contact with the upper surface of the fixed side mounting plate (52),
The first feature is that the core (50) and the lower mold (40) are in contact with each other at the tapered surfaces (41, 51), and the lower mold (40) is positioned.

When the mold is opened, that is, when the upper mold (30) is raised, the lower mold (40) is packed (58).
By the elasticity of the packing (58), the lower die (40) is supported by the bottom die (40) and the upper surface of the fixed side mounting plate (52) so as to have a predetermined gap (M). 40) is movable, and the movement is performed by the block (6
The second feature is that it is limited by 0).

The packing (58) is an O-ring, and when the lower mold (40) is raised, it serves as a sealing body in a space between the lower mold (40) and the fixed side mounting plate (52). At the same time, air is circulated through the open gap of the contact surface of the tapered surfaces (41, 51) between the lower mold (40) and the core (50) formed by the lower mold (40) rising, The third feature is that the molded product is projected by the supply of.

Further, when the lower mold (40) is raised,
The fourth characteristic is to release the adhesion state between the core (50) and the molded product (1).

[0019]

In the first aspect, the upper die (30) and the lower die (4)
0) in contact with the tapered surfaces (34, 44), and further, the lower mold (40) has a tapered surface (41, 41) of the core (50).
In 51), the centers are mutually positioned. The lower mold (0) has a packing (5
It moves downward and rises according to the crushing allowance in 8) to allow movement.

In the second aspect, the moving amount of the lower die (40) in the downward movement and the upward movement, that is, a predetermined amount (M).
Is restricted by a block for fixing the lower die (40) to prevent misalignment of the movable lower die (40).

Further, in claim 3, since the packing (58) is an O-ring, since the O-ring has a circular cross section, the restorability is good and the lower mold (40) is pressed. As the upper mold (30) rises, the lower mold (40) follows the rising of the upper mold (30) quickly.
Of the lower die (40) is stopped at the position where the movement is restricted, so that the gap (M) formed between the bottom surface of the lower die (40) and the upper surface of the fixed side attachment plate (52) is increased. ) Acts as a sealed body.

Further, in a fourth aspect, the lower die (4
0) rises, the inner part (1) of the molded product (1) molded so as to be fitted onto the core (50).
0) has a draft and the outer part (5) of the molded article (1)
Has a draft angle with respect to the upper direction of the lower mold (40), but the molded product (1) is held by the lower mold (40) when the lower mold (40) is raised. Ascend to the core (5
The bottom part (11) and the inner part (10) in 0) were released from the adhesive state (hereinafter referred to as release).

[0023]

EXAMPLES Hereinafter, a molding die according to the present invention will be described with reference to FIG.
A product molded by the mold will be described with reference to FIGS. 2, 3, and 4.

In the present description, the names of the respective parts in the cavity (cavity) C in FIG. 1 are the same as those in FIGS. 2, 3 and 4, and the reference numerals are omitted in FIG. 2 to FIG. 4 are given the same reference numerals and designations, and when differently explaining FIG. 2 and FIG. 4, they are denoted by a in FIG. 2 and b in FIG. 4, respectively. .

First, as shown in FIG. 1, the upper die 30 is fixed to the movable side mounting plate 31 by a fastener 33 such as a bolt and a washer, and a taper surface 34 is formed on the lower outer periphery of the upper die 30.
The lower part is a flat parting line P,
The movable side mounting plate 31 which is cut and assembled is fixed to a movable plate (not shown) so as to come into contact with a tapered surface (hole) 44 and a parting line P of a lower mold 40 which will be described later. .

Next, a taper surface 41 extending from the starting point 6a at the same angle as the inclination of the outer edge portion 7 is formed inside the lower mold 40, and a gap M (here, a height M) of the jaw height H of the block 60 is formed. A mounting portion 59 having a height F lowered by a height corresponding to a gap formed between a top surface of a fixed side mounting plate 52 and a bottom surface of the lower mold 40, which will be described later, is provided outside the lower mold 40.

Below the core 50, a taper surface 51 is formed at an angle that coincides with the taper surface 41 extending from the starting point 6a of the lower die 40, and bolts are formed in bolt holes provided at appropriate positions of the fixed side mounting plate 52. It is attached by a fastener 53 such as a washer so as to be located almost at the center of the fixed side attachment plate 52.

An air hole 54 is formed at a proper position on the outer peripheral side surface of the fixed side mounting plate 52 in the center direction, and an air hole 55 is formed so as to penetrate near the outer periphery of the tapered surface 51 of the core 50. There is. A packing groove 57 is provided at a position slightly apart from the outer circumference of the tapered surface 51 of the core 50, and the width of the packing groove 57 is wider than the diameter of the O-ring used as the packing 58. Further, the groove depth is such that even if the lower die 40 moves upward by the gap M, the bottom surface of the lower die 40 is strongly pressed and the bottom surface is in close contact with the upper surface of the fixed side mounting plate 52. The O-ring 58 is formed to a depth that does not crush it. Therefore, although the gap M is inevitably determined and limited by the O-ring 58, the jaw height H is 0.5 m below the height F of the mounting portion 59.
It is regulated as m. The height H and the groove depth can be changed in consideration of the function of the O-ring 58.

The core 50 is fixed in the center of the fixed side mounting plate 52 as described above, and the packing groove 5
7, an O-ring 56 is inserted, the taper surface 41 of the lower die 40 and the taper surface 51 of the core 50 are covered, and the block 60 is bolted so as to face the outer peripheral mounting portion 59 of the lower die 40. Temporarily fix with a fastener 63 such as a washer. Further, the upper die 30 fixed to the movable side mounting plate 31 is brought into contact with each other at the parting line P by inserting the taper surface 34 of the upper die 30 and the taper surface 44 of the lower die 40 to each other. When the movable platen (not shown) is lowered in the downward D direction and the block 60 is tightened and fixed when the bottom dead center is reached, the block 60 is fixed.
And a mounting portion 59 is provided with a gap M of height difference = HF, and the upper part of the core 50 and the lower part of the upper mold 30 and the lower part of the upper mold 30 have their centers aligned with each other, and are formed by cutting. The cavity C is constituted by After this centering, the movable side mounting plate 31 is fixed to the movable plate and the fixed side mounting plate 52 is fixed to the fixed plate.

When the upper die 30 moves up in the ascending U direction of the movable plate, the lower die 40 ascends to follow the upward movement of the upper die 30 due to the restoring force of the O-ring 58. The height difference from the mounting portion 59 is limited to HF, and a gap M (0.5 mm in the embodiment) is formed between the bottom surface of the lower mold 40 and the upper surface of the fixed side mounting plate 52. Since the O-ring 58 in the packing groove 57 is in strong contact with the groove bottom and the bottom surface of the lower mold 40, the O-ring 58 maintains airtightness, and the tapered surfaces 41 that are in contact with each other as the lower mold 40 moves up. , 51 forms a slight gap, so that when air is supplied from an air supply pipe (not shown) connected to the screw portion of the air hole 54, the air moves from the slight gap toward the cavity C direction. Supply and distribute.

For the sake of easy understanding, the shapes of the containers (molded articles) 1a and 1b forming the inside of the cavity C will be described in detail with reference to FIG.
The container 1a is different from the container 1b of FIG. 4 in that the locking portion 2 and the upper step portion 3 are formed over the entire circumference in the lateral direction from the bottom portion 11.

That is, the inner portion 10 is formed upright around the bottom portion 11 of the container 1a, and the inner portion 10 has a draft with respect to the core 50.
The upper portion of the inner portion 10 is an outer edge portion 7 which is open outward and has a smaller wall thickness than the lower portion. And the bottom 1
A locking portion 2 and an upper step portion 3 are formed so as to project outward from the outer peripheral side portion of 1 to increase the wall thickness. Then, the rising start point 4a outside part 5 of the upper step part 3 is connected to the start point 6a,
The outer edge portion 7 is inclined outward from the starting point 6a to the upper edge 8,
The outer edge portion 7 is opposite to the drawing direction of the lower mold 40, and the outer portion 5 has a draft angle.

As can be seen from the appearance of FIG. 2, the bottom part 1
The outer peripheral side of No. 1 has a large thickness, the upper edge 8 side has a small thickness, and the interval V of the outer edge of the upper edge 8 is smaller than the interval W of the rising start point 4a by R. More specifically, the draft of the outer portion 5 from the rising start point 4a is 5 °,
The angle of the outer edge portion 7 from the starting point 6a is 4 ° to 8 °.
Since the length from a to the upper end of the upper edge 8 is 7 to 5 mm, it is inevitable, but the interval V is smaller than the interval W by R. Then, when the angle of the outer edge portion 7 is made larger than 8 °, the interval V becomes larger than the interval W, so that the inner diameter (shape) of the starting point 6a in the lower mold 40 becomes the smallest portion, and when the container 1 is pulled out. However, there is a possibility that the peripheral edge of the upper edge 8 which becomes the minimum becomes larger than the elastic limit of the material of the container 1 and breaks. Further, the outer edge portion 7 has a reverse draft with respect to the lower die 40, but by shortening the length up to the upper edge 8, the starting point 6a in the die can be passed early and the wall thickness can be increased. Space (cavity) in the outer part 5
It is possible to escape to the C side. In this container 1a, the parting line Pa is used as the locking portion 2, so that the lower die 40 has a large diameter (shape) in the product drawing direction. 12 is a bottom edge (thread bottom).

The container 1b shown in FIG. 4 is the container 1 described above.
With respect to a, it is a case where the locking portion 2 and the upper step portion 3 are not formed from the bottom portion 11 to the outer peripheral side portion of the portion. The outer peripheral side portion of the bottom portion 11 is made thicker, and the end point of the curved portion outside the bottom outer periphery of the bottom portion 11 is a rising start point 4b, and the rising start point 4b is also the starting point of the parting line Pb. The upper die 30 and the lower die 40 are formed with the parting line Pb as a boundary. From the rising start point 4b to the outer side portion 5, the start point 6
b, the outer edge portion 7 and the upper edge 8 and the inner portion 11 extending upward from the bottom portion 11 form a container 1b, and the outer portion 5, the outer edge portion 7 and the inner portion 10 are the same as those of the container 1a. Therefore, the description is omitted.

The common points of the above-mentioned containers 1a and 1b are that the interval V at the upper end of the upper edge 8 is smaller than the interval W at the rising start point 4 by R and that the lower mold 40 is removed at the start point 6 as a boundary. There is an outer portion 5 that is a draft with respect to the direction, and an outer edge portion 7 that is in the opposite direction to the draft, and the inner portion 10 has a draft and an upper edge 8 side with respect to the core 50. Is a larger draft, which means that the thickness is thicker on the outer side portion of the bottom portion 11 and thinner on the upper edge 8 side.

Upper mold 30 and lower mold 4 constituting the cavity C
0 and the core 50 are formed by assembling by cutting and grinding the outer shape and the inner shape of the container 1 described in FIGS. 2 and 4, respectively. The inner portion 10 has a sufficient draft for the core 50. Further, at least the starting point 6 is provided for the lower mold 40, and the outer side portion 5 upward from the starting point 6 is provided.
Has a draft. Therefore, the molded container 1
When the upper die 30 rises in the ascending U direction after the completion of molding, the lower die 40 rapidly rises so as to follow the upper die 30 by the elasticity of the O-ring 58, and at this time, the starting point 6
Is a minimum diameter (outer shape) portion, and the outer portion 5 has a draft, so that the lower die 4 is opposed to the draft.
Since 0 rises, the container 1 is released from the core 50 as if it was held by the lower mold 40.

At the time of this mold release, the raised lower mold 40 dissociates the mutually tapered surfaces 41 and 51 with the core 50 in contact with each other to form a slight void. Then, a gap M limited by the jaw height H of the block 60 is formed between the bottom surface of the lower mold 40 and the upper surface of the fixed-side mounting plate 52. The airtightness of the gap M is maintained in the outward direction, and the air supplied from the air hole 54 passes through the air hole 55 through a slight space in the tapered surfaces 41 and 51 and is blown up from the inner portion 10 to the bottom portion 11. At this time, the outer edge portion 7 is inclined outward, and the inner portion 10 of the outer edge portion 7 has a greater inclination than the draft on the bottom portion 11 side of the inner portion 10, so that air flows through the inner portion. It is easy for the air to flow into the bottom portion 10, so that the air flows to the bottom portion 11 in a concentrated manner. By this air, the thickness of the bottom portion 11 is thick and has rigidity, and the thickness becomes thinner toward the upper edge 8 to have elasticity, so that the outer edge portion 7 is momentarily deformed so as to be deformed. Even if a part of the edge on the upper edge 8 side is made to escape so that the starting point 6 of the lower mold 40 slides into the cavity C in the direction of the outer portion 5, the molded container 1 is projected so that the entire container 1 suddenly pops out. That is, the outer portion 5 has a draft with respect to the lower mold 40, and the draft of the inner portion 10 thereof increases the wall thickness on the bottom 11 side and widens the cavity in the cavity C. Can easily escape from the side space between the core 50 and the lower mold 40. During molding, the molten resin material is compression-molded from the side of the bottom portion 11 toward the upper edge 8 and, therefore, may leak from the upper edge 8 to a slight gap where the tapered surfaces 41 and 51 come into contact with each other. There is a case where it is taken out and burr is taken out, but when the container 1 escapes, the starting point 6
No burrs are left on the outer peripheral edge of the upper edge 8 of the outer edge portion 7 of the container 1 that has been ejected, since the burrs are treated to remove burrs.

Further, since the lower mold 40 is movable by a small amount of the gap M, the conventional strip ring and ejector for separating the container 1 from the core 50 by the starting point 6 which is engaged when the lower mold 40 is raised. It has the function of. Further, when the upper die 30 descends and comes into contact with the parting line P surface of the lower die 40, the tapered surfaces 34 and 44 lock each other to hold the center, and the lower die 40 has the tapered surface 41 of the core 50. 51 and 51 are in contact with each other so that their centers coincide with each other. Further, as the upper die 30 moves upward, the O-ring 58 supports the lower die 40 by a restoring force and moves the upper die 40 upward to release the contact with the tapered surfaces 41 and 51, and to move between the tapered surfaces 41 and 51. To form air circulation voids.

Since the container 1a has the locking portion 2 and the upper step portion 3, when the lower die 40 is raised, the locking portion 2
Also, the container 1a can be supported by supporting the upper portion 3 and the entire container 1a can be lifted. Further, in the container 1b, since the starting point 4b having a larger diameter (shape) than the starting point 6b is used as the parting line Pb, the container 1b can be lifted in the draft direction.

Since the container 1 is formed of synthetic resin, it has a shrinkage ratio peculiar to the synthetic resin as it cools and solidifies. It becomes easy to release the mold.

Further, the thermosetting resin in which the sprue is not provided in the mold has been described, but it is possible to form the thermoplastic resin to be molded by providing the upper mold or the core with the sprue communicating with the cavity. Even if used, it is sufficiently effective. The effect will be described below.

[0042]

According to the first aspect of the present invention, the upper die and the lower die are locked by the tapered surfaces, and the lower die and the core are also in contact with each other by the tapered surfaces to position and hold the center of the lower die. The lower mold can move up and down in the vertical direction according to the operation of the upper mold by the restoring force of the packing, and as with the conventional die set mold, the relationship between the upper mold, the lower mold of the mold and the core is guaranteed. Precisely hold the molding cavity of.

In the second aspect, since it is possible to limit the amount of upward movement of the lower mold by the block, the restoring force of the packing causes the lower mold to follow the upward movement of the upper mold to form a molded container. Buckling is not induced because the container is held in the lower mold and gently lifted, and the molded container is lifted in contact with the starting point and the outside.

Further, in claim 3, a space is formed between the bottom surface of the lower die and the upper surface of the fixed side mounting plate in association with the upward movement of the lower die in claim 2, but the O-ring is A sealing body is formed between the bottom surface and the bottom surface of the packing groove, and since the contact portion between the lower die and the core is a tapered surface, even if the lower die moves upward, a space is left in the tapered surface. The air gap is formed to form an air circulation gap, and the air is easily circulated to the inside and bottom of the container. Therefore, the air is concentrated in the bottom direction and the molded product is quickly projected between the lower mold and the core.

According to a fourth aspect of the present invention, with the movement of the lower mold of the second aspect, the lower mold has a function as a strip ring, and the core and the molded product are separated from each other in advance.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a molding die of the present invention.

FIG. 2 is a half cross-sectional side view of a molded product molded with the mold of the present invention.

FIG. 3 is a top view showing an example of a molded product of the present invention.

FIG. 4 is a half cross-sectional side view in which a part of a molded product molded by the mold of the present invention is modified.

FIG. 5 is a schematic cross-sectional view illustrating a conventional molding die and a protrusion.

[Explanation of symbols]

 1 Container (Molded Product) 30 Upper Die 31 Movable Side Mounting Plate 34 Tapered Surface 40 Lower Die 41 Tapered Surface 44 Tapered Surface (Hole) 50 Core 52 Fixed Side Mounting Plate 54 Air Hole 55 Air Hole 57 Packing Groove 58 Packing (O Ring) ) 59 Mounting part 60 Block C Cavity F Height (of mounting part 59) H (Block 60 jaw) Height M Gap P Parting line

Claims (4)

[Claims] 1. An upper die, a lower die, and a core constitute a set of molding dies, the upper die is fixed to a movable side mounting plate, and the core is fixed to the fixed side mounting plate. A mold in which the lower mold is fixed to the core, and the upper mold is joined to the lower mold to form a cavity with the core when the mold is closed. As a core, a packing groove is provided at a position slightly apart from the outer solid of the core, and an air hole penetrating from the side portion of the fixed side mounting plate to the outer peripheral side of the core and inward from the packing groove, The lower die of the lower die is fitted with a tapered surface on the lower outer periphery of the core, and the packing inserted into the packing groove and the air hole are located on the bottom of the lower die. Then, fix the blocks to multiple places on the fixed side mounting plate and pack. The lower mold is attached so as to have a crushing allowance, and a taper hole is provided above the lower mold to be positioned and locked by being joined to the upper mold, and a taper surface is provided on the outer periphery of the lower surface of the upper mold. Is formed so as to fit into the tapered hole of the lower mold, and the upper mold comes into contact with the lower mold by the operation of the movable plate to close / clamp the mold, and the packing is crushed to close the lower mold. And a bottom surface which is moved downward so that the bottom surface is in close contact with the top surface of the fixed-side mounting plate, the core and the lower mold are in contact with each other by tapered surfaces, and the lower mold is positioned. . 2. In the mold open state, the lower mold is elastically deformed by a packing so that a predetermined amount of clearance is provided between a bottom surface of the lower mold supported by packing and an upper surface of the fixed side mounting plate. The molding die according to claim 1, wherein the lower die is movable, and the movement is limited by the block. 3. The O-ring is used as the packing, and when the lower mold is lifted, a sealing body is formed in a space between the lower mold and the fixed side mounting plate, and at the same time, the lower mold is lifted. The molding die according to claim 1 or 2, characterized in that air is circulated in an open gap of a contact surface of a tapered surface between the lower mold and the core, and a molded product is projected by the supply of the air. . 4. The molding die according to any one of claims 1, 2 and 3, characterized in that when the lower mold rises, the adhesive state between the core and the molded product is released.