WO2003061874A1

WO2003061874A1 - Seal structure of metal mold

Info

Publication number: WO2003061874A1
Application number: PCT/JP2003/000361
Authority: WO
Inventors: Masashi Ito; Shouji Kobayashi; Mamoru Murakami
Original assignee: Ryobi Ltd.
Priority date: 2002-01-22
Filing date: 2003-01-17
Publication date: 2003-07-31
Also published as: JP2003211261A; JP3984836B2

Abstract

A seal structure of a metal mold capable of performing an excellent vacuum casting by sufficiently sealing the metal mold with a simple structure, wherein a sloped surface (28a) is provided on a contact part (28) provided on the upper surface (25) of a fixed mold (20), a seal member (45) is installed continuously all around the flat surface (42a) and the sloped surface (42b) of the contact member (42) of a slide core (40), and when a movable mold (30) is moved forward after the slide core (40) is clamped in the movable mold (30), the sloped surface (42b) of the slide core (40) is pressed against the sloped surface (28a) of the fixed mold (20), whereby, since the sloped surfaces (28a, 42b) are tilted at a same angle relative to the forward moving direction of the movable mold (30), the seal member (45) installed on the sloped surface (28a) is not slidably moved on the sloped surface (42b) during the forward movement of the movable mold (30), and the seal member (45) can be prevented from being worn and cut off by the sliding.

Description

Description Mold seal structure Technical field

The present invention relates to a mold sealing structure, and more particularly, to a mold sealing structure that can prevent wear of a sealing member with a particularly simple structure. Background art

2. Description of the Related Art Conventionally, a die-casting die structure including a fixed die, a movable die, and a slide core has been known. When manufacturing using such a mold, first slide the slide core to the movable mold, set the slide core to the movable core, and crimp the movable mold and the slide core to the fixed mold. Close the mold. Here, in order to suppress the entrainment of air in the molten metal and improve the manufacturing quality, all the contact surfaces between the dies are sealed with a sealing member, and the cavities in the dies are evacuated by vacuuming. There is a need.

However, for example, when such a seal member is provided on the contact surface between the slide core and the movable mold, a problem has occurred in that the seal member is worn and cut off by the slide of the slide core, and a sufficient seal is not performed. .

Therefore, Japanese Patent Application Laid-Open No. H07-474757 proposes to provide a seal ring which can be moved forward and backward inside a movable die driven by a cylinder. Here, first, the seal ring is retracted so that it does not hit the slide core, and the slide core is slid with respect to the movable type, and the slide core is set to the movable type. Next, the seal ring is advanced, and the tip surface is pressed against the slide core to seal between the slide core and the seal ring. In this way, the seal ring is rubbed by the slide of the slide core. It is not worn or cut.

However, in such a seal structure, it is necessary to arrange the seal ring inside the movable mold, and it is necessary to arrange a cylinder for moving the seal ring back and forth, which makes the mold configuration extremely complicated. . Disclosure of the invention

Therefore, the present invention provides a mold that can sufficiently seal a mold, prevent abrasion and cutting of a seal member due to a slide, and can perform a good vacuum structure while having a simple configuration. It is intended to provide a seal structure.

In order to achieve the above object, the present invention provides a fixed type (20) having a first inclined surface (28) at an end and a flat end surface (35). The movable mold (30) is moved forward and backward with respect to the movable mold (30), and a slide core (40) is moved in a direction intersecting the moving direction of the movable mold (30). The child (40) has a second inclined surface (42b) in contact with the first inclined surface (28) and a flat surface (42a) in contact with the flat end surface (35). A sealing member (45) that continuously makes a round on the second inclined surface (42b) and the flat surface (42a) is provided, and the first inclined surface (28) is provided. ) And the second inclined surface (42b) provide a mold sealing structure which is inclined at the same angle with respect to the moving direction of the movable mold (30).

In such a seal structure, the slide core (40) is moved in a direction intersecting with the moving direction (30) of the movable mold (30) and the slide core (40) is set to the movable mold (30). To At this time, the flat surface (42a) of the slide core (40) is pressed against the flat end surface (35) of the movable die (30). Since the seal member (45) is provided on the flat surface (42a) of the slide core (40), the seal member (45) has a flat surface (42a) and a flat end surface. (3 5) compressed between Thus, a seal can be created between the slide core (40) and the movable die (30).

When the movable die (30) is moved in the forward direction with the slide core (40) set, the slide core (40) and the movable die (30) become fixed (20). It is crimped and molded. At this time, when the second inclined surface (42b) of the slide core (40) is pressed onto the first inclined surface (28) of the fixed mold (30), the second inclined surface (42) is pressed. The seal member (45) provided in 42b) is compressed for the first time between the first and second inclined surfaces, and seals the slide core (40) and the fixed mold (20). The first inclined surface (28) and the second inclined surface (42b) are formed by the movable mold (30) and the slide core (40) being clamped to the fixed mold (20). Since the first contact is made, the second inclined surface (42b) does not slide on the first inclined surface (28) when the movable die (30) moves. Therefore, the seal member (45) provided on the second inclined surface (42b) is not worn or cut by the slide, and a seal structure having high sealability and durability can be provided. Since the seal member (45) is provided continuously around the flat surface (42a) and the inclined surface (42b) of the slide core (40), the seal member (45) is provided with the slide member (45). It is possible to completely seal between the core (40) and the movable type (30) and the fixed type (20).

Furthermore, the seal between the slide core (40) and the movable die (30) can be realized only by crimping the slide core (40) to the movable die (30). ) And the fixed type (20) can be sealed by simply pressing the slide core (40) to the fixed type (20). For example, it is necessary to separately provide a cylinder for moving the seal ring forward and backward. As a result, the configuration of the entire mold can be simplified, and the number of mold clamping steps can be minimized. The slide core (40) has a projection (41a) projecting in the reciprocating direction with the slide core (40) clamped to the movable mold (30). And a contact member (42) having the second inclined surface (42b) and the flat surface (42a). ) Preferably has a core accommodating portion (24) for accommodating the convex portion (41a). According to such a configuration, when the movable mold (30) and the slide core (40) are clamped to the fixed mold (20), the convex portion (41a) becomes the accommodating portion.

(24). That is, since the convex portion (41a) of the slide core (40) is housed in the housing portion (24) of the fixed mold (20), the mold is clamped. The core (40) can be prevented from moving. Therefore, when the mold is closed, the seal ring is kept in a static state, so that deterioration of the fatigue can be prevented. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an exploded perspective view of a mold to which a seal structure according to an embodiment of the present invention is applied. BEST MODE FOR CARRYING OUT THE INVENTION

A mold seal structure according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a perspective view showing a vacuum fabrication mold 10 having a mold seal structure of the present invention. As shown in FIG. 1, the mold according to the present embodiment has a fixed mold 20, a movable mold 30, and a slide core 40. The movable mold 30 can move forward and backward with respect to the fixed mold 1, and the slide core 40 can move in a direction crossing the moving direction of the movable mold 2.

The contact surface 22 of the fixed die 20 has a die storage portion 23 for storing a die (not shown) and a tapered core storage portion 24 communicating with the die storage portion 23. Is formed. Further, the upper surface 25 of the fixed die 20 is provided with a contact portion 28, and the contact portion 28 is provided with an inclined surface 28a which is inclined rearward and upward from the contact surface 22 side. Can be

The movable die 30 is installed at a position facing the contact surface 22 of the fixed die 20. The movable die 30 includes a contact surface 32 contacting the contact surface 22 and an upper surface 35 serving as a flat end surface. Have. The abutment surface 32 has a die storage section for storing dies (not shown).

A core accommodating portion 34 communicating with the die accommodating portion 33 is formed. Grooves 34b, 34b extending in the direction of movement of the slide core 40 are formed in the side surfaces 34a, 34a of the core receiving portion 34, and the core receiving portion 34, The upper ends of the extension grooves 34b, 34b are open to the upper surface 35. In addition, a seal member 36 is arranged on the contact surface 32 so as to surround the die housing portion 33 and the core housing portion 34.

The slide core 40 has a core body 41 and a contact member 42, and the contact member

4 2 is screwed to the core body 4 1. The core body 41 has a substantially L-shape having an upper part 41a. The outer periphery of the tip of the β portion 41 a is tapered, and is formed so as to fit in the tapered core housing portion 24. A core storage section (not shown) for storing a core (not shown) is formed on the bottom surface of the slide core 40. Further, slide keys 43, 43 for engaging with the grooves 34b, 34b are formed on the side surface opposite to the side surface 41b of the core body 41, not shown.

The contact member 4 2 has a flat surface 4 2 a in contact with the upper surface 4 1 c of the core body 4 1, and an inclined surface 4 2 b formed continuously with the flat ′ surface 4 2 a, A sealing member 45 is provided continuously around the flat surface 42a and the inclined surface 42b. Actually, a groove (not shown) is formed continuously around the flat surface 42a and the inclined surface 42b, and the seal member 45 is fitted therein. The seal member 45 is formed of, for example, rubber or the like. The flat surface 42a is slightly larger than the upper surface 41c of the core body 41, and is formed so that the periphery of the flat surface 42a protrudes from the upper surface 41c. The seal member 45 is disposed around the flat surface 42 a so as to be located at the protruding portion, that is, outside the core body 41. The angle of inclination of the inclined surface 4 2 b with respect to the flat surface 42 a is set to be the same as the angle of inclination of the inclined surface 28 a of the contact portion 28 with the upper surface 35 of the movable die 30. It has been.

Next, the operation of the mold 10 in the present embodiment will be described. In the slide core 40, the contact member 42 is screwed to the core body 41 in advance. In addition, a pair of dies (not shown) on which the mold cavities are formed are fitted into the respective die storage portions 23 and 33. A core (not shown) is fitted into a core accommodating portion (not shown) of the slide core 40. Next, while sliding the slide keys 43, 43 into the grooves 34b, 34b, the slide core 40 is clamped to the movable die 30. At this time, the seal member 45 comes into contact with the upper surface 35 of the movable mold 30 at the seal member contact position indicated by a dotted line A in FIG. 1 and is compressed, so that the flat surface 4 2 a and the gap between the upper surface 35 Is done. As can be seen from FIG. 1, the seal member contact position A coincides with the upper end portion of the seal member 36, and the upper end of the seal member 36 abuts on the seal member 45.

Subsequently, the movable die 30 is advanced toward the fixed die 20, and the contact surface 32 of the movable die 30 becomes the contact surface 22 of the fixed die 20, and the inclined surface 4 of the slide core 40. 2b is pressed against the inclined surface 28a of the fixed mold 20 and clamped. Thus, the contact surfaces 32 and 22 are sealed by the seal member 36, and the inclined surfaces 42b and 28a are sealed by the seal member 45. The contact position of the sealing member 45 on the inclined surface 28a is shown by a dotted line B in FIG. The protrusion 41 a of the slide core 40 is housed and fixed in the core housing part 24. And da The product is manufactured by evacuating the inside of the mold cavity formed in the chair, pouring and solidifying the molten metal.

Here, since the inclined surfaces 28 a and 42 b are inclined at the same angle with respect to the forward direction of the movable mold 30, the inclined surfaces 28 a and 42 b are on the inclined surface 42 a during the forward movement of the movable mold 30. The movable member 30 and the fixed die 20 are not closed by sliding the sliding member 45 provided on the inclined surface 28 b on the inclined surface 28 b, and the inclined surface 28 a, 42 b Contact each other. As described above, since the inclined surfaces 28a and 42b are formed not as the slide surfaces but as the pressure-bonded surfaces, it is possible to prevent problems such as abrasion and cutting of the seal member 45 due to the slides. In addition, since a structure for moving the seal member forward and backward is not required, the configuration of the entire mold can be simplified, and a step of moving the seal member forward and backward is not required. Can be suppressed.

Further, since the convex portion 41a of the slide core 40 is accommodated in the core accommodating portion 24, the slide core 40 can be prevented from being moved by the applied pressure.

The seal structure of the mold according to the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims. For example, in the above embodiment, the abutment member 42 and the core body 41 are screwed together with bolts or the like, but the abutment member 42 and the core body 41 may be integrally formed. Good. Industrial applicability

As described above, the seal structure of the mold according to the present invention is useful as a seal structure of a mold used for die-casting, and can prevent abrasion and cutting of the seal member with a particularly simple structure, and provide a good vacuum This is extremely effective as a mold seal structure that can perform fabrication.

Claims

The scope of the claims

1. A fixed type (20) having a first inclined surface (28) formed at an end, and a movable type having a flat end surface (35) and moved forward and backward with respect to the fixed type (20). (30) and

A sliding core (40) that is moved in a direction intersecting with the moving direction of the movable mold (30).

The slide core (40) has a second inclined surface (42b) in contact with the first inclined surface (28) and a flat surface (42) in contact with the flat end surface (35). a) is provided, and a sealing member (45) is provided continuously around the second inclined surface (42b) and the flat surface (42a), and the first inclined surface (42) is provided. 28) and a mold sealing structure characterized in that the second inclined surface (42b) is inclined at the same angle with respect to the moving direction of the movable die (30).

2. The slide core (40) includes a projection (41a) that projects in the forward and backward direction in a state where the slide core (40) is clamped to the movable die (30). And a contact member (42) having the second inclined surface (42b) and the flat surface (42a). 2. The mold sealing structure according to claim 1, wherein a core accommodating portion (24) for accommodating said convex portion (41a) is formed in (1).