JPH07284903A - Metallic mold - Google Patents

Abstract

PURPOSE:To open/close a movable insert without providing a dedicated cylinder. CONSTITUTION:In a metallic mold, the movable inserts 7, 8 are connected so as to be rotatable by the rotating shafts 9 on each side part of one pair of openable/closable side molds 6, and the rotating force of the rotation of the opening side in the rotation around the rotating shafts 9 in the movable inserts 7, 8 is made to be friction force with the cast product. Further, at the outside of locuses of the movable inserts 7, 8, a movable insert regulating means for closing the movable inserts 7, 8 which are open toward the side mold 6 is arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold, and is used, for example, in a horizontal mold of a low pressure casting machine.

[0002]

2. Description of the Related Art Conventionally, in a low-pressure casting apparatus, a horizontal mold divided into a plurality of pieces in the circumferential direction is inserted between an upper mold and a lower mold, and a cavity is formed by the upper mold, the lower mold, and the horizontal mold. The product is taken out by pouring molten aluminum into it, solidifying it, and opening the mold. However, as shown in FIG. 9, when the horizontal mold 3'is a pair, the horizontal mold 3'is opened in the tangential direction with the product at the milling portion, so that the horizontal mold 3'is likely to cause galling. In order to prevent galling, conventionally, there is a horizontal milling portion provided with a draft 100 in the product tangential direction as shown in FIG. However, when a draft is applied, the product becomes useless and the cutting in the subsequent process becomes so difficult and the material is wasted. As measures against this, for example, Japanese Patent Laid-Open No. 1-2
As disclosed in Japanese Unexamined Patent Publication No. 37066, each horizontal mold is divided into three parts in the cavity circumferential direction into a main block and sub-blocks on both sides of the main block, and the sub-block corresponding to the millet part is manufactured along a dividing surface with the main block. A structure is provided that is slidable in the radial direction, and that a cylinder that forcibly moves the sub block with respect to the main block is provided between the main block and each sub block to forcibly open and close the sub block. Proposed.

[0003]

However, JP-A 1-2
When a dedicated cylinder for opening and closing the sub-block corresponding to the millet portion is provided in addition to the horizontal drive cylinder as in Japanese Patent No. 37066, the number of cylinders increases, the die apparatus becomes large, and the structure is complicated. And cost increase.
An object of the present invention is to divide a pair of horizontal molds into a plurality of parts without relying on a draft to take measures against a milling part, and to open and close a mold part corresponding to the milling part, for example, a nest, without providing a dedicated cylinder. The purpose is to do so.

[0004]

The above object can be achieved by the following mold of the present invention. (1) A pair of openable and closable horizontal molds and a rotary shaft that is rotatably connected to each side part of each horizontal mold. A mold equipped with a movable insert that is considered to be frictional force. (2) A pair of openable / closable horizontal molds and a rotary shaft that is rotatably connected to each side part of each horizontal mold. A metal insert including a movable insert having a frictional force, and a movable insert restricting unit provided for the movable insert and closing the movable insert when the pair of horizontal molds are opened. Type.

[0005]

In the die of the above (1), when the pair of horizontal dies are separated from each other to open the dies, the movable insert inserts into the horizontal die about the rotation axis due to the frictional force with the cast product solidified in the cavity. Relative to the casting, the movable insert, which is the milling portion, tries to separate from the casting in a direction inclined from the tangential direction. Therefore, it is possible to suppress the occurrence of galling in the perforation portion when the horizontal type is opened. With the mold of the above (2), in addition to the function of the mold of the above (1), the following function is further obtained. That is, if the movable insert is left open with respect to the horizontal mold when the horizontal mold is opened, when the horizontal mold is closed,
There is a risk that the corners of the movable inserts will hit and the corners of the movable inserts will wear out quickly, and the corners of one movable insert will lock against the sides of the other movable insert,
If the horizontal mold is further approached as it is, the other movable insert may receive a force in the direction perpendicular to the horizontal mold opening / closing direction from one movable insert, and the horizontal molds may be displaced in the direction perpendicular to the horizontal mold opening / closing direction. The problem arises. However, above (2)
In the mold, when the horizontal mold is opened, the movable nest restricting means closes the movable nest. Therefore, when the horizontal mold is closed, the above problem no longer occurs.

[0006]

1 to 7 show a mold according to a preferred embodiment of the present invention. 1 and 2 show a first embodiment of the present invention, FIGS. 3 and 4 show a second embodiment of the present invention, and FIGS. 5 and 6 show a third embodiment of the present invention. 7 is applicable to any of the embodiments of the present invention. Components common to all the embodiments are given the same reference numerals in all the embodiments. First, a configuration common to all the embodiments will be described with reference to FIGS. 1 and 7, for example. 1 and 7, the mold is, for example, a mold of a low-pressure casting device, for example, a low-pressure casting mold of an aluminum wheel (aluminum automobile wheel). Molds are upper mold 1 and lower mold 2.
And a pair of horizontal mold assemblies 3 provided between the upper mold and the lower mold. The upper mold 1, the lower mold 2, and the pair of horizontal mold assemblies 3 form a cavity 4 when the mold is closed. The cavity 4 has, for example, an annular shape, the outer peripheral side of the cavity 4 is bounded by the horizontal mold assembly 3, and the inner peripheral side of the cavity 4 is a protruding portion formed in the upper mold 1 or the lower mold 2 into the horizontal mold assembly. Be bound by. A molten aluminum (aluminum alloy) is poured into the cavity 4, the molten metal is solidified into a cast product, and the mold is opened and taken out from the mold. The shape of the cavity 4 changes according to the shape of the product to be cast, but the product is, for example, a light alloy (aluminum alloy) wheel for vehicles.

As shown in FIG. 1, the pair of horizontal assemblies 3 are arranged symmetrically with respect to the center of the cavity, are opened and closed in the horizontal direction A (horizontal direction), and are moved toward and away from each other. A state in which the pair of horizontal mold assemblies 3 are brought close to and in contact with each other corresponds to a mold closed state, and a separated state corresponds to a mold open state. The horizontal assembly 3 is in a mold closed state when pouring the molten metal, and is opened when the cast product is taken out. The horizontal assembly 3 is opened and closed by driving means, for example, a hydraulic cylinder 5. FIG. 1 shows a rod portion of the cylinder 5.

Each horizontal die assembly 3 includes a central horizontal die 6 and movable inserts 7, 8 on both sides of the horizontal die 6 in the circumferential direction of the cavity.
It is divided into three parts. The horizontal mold 6 of the one horizontal assembly 3 and the horizontal mold 6 of the other horizontal assembly 3 can be opened and closed linearly (in the direction A in FIG. 1) to the left and right with respect to the center of the cavity. 7, 8
Is relatively movable with respect to the horizontal mold 6 in a direction tilted from the horizontal mold movement direction (including B, B ′ directions and rotation directions in FIG. 1). As a result, it is possible to prevent or suppress galling of the cast product at the milling portion (horizontal assembly mating surfaces 12, 13 and the vicinity thereof) when the horizontal assembly 3 is opened. That is, when the milling portion moves tangentially to the cast product, galling occurs, but since it moves in a direction inclined with respect to the tangential direction, galling does not occur. Reference numerals 10 and 11 denote split surfaces of the horizontal die 6 and the movable inserts 7 and 8.

The movable insert 7 is provided on one side of the horizontal die 6, and the movable insert 8 is provided.
Are connected to the other side of the horizontal die 6 by a rotating shaft 9 so as to be horizontally rotatable. Therefore, the movable inserts 7 and 8 move forward and backward with respect to the horizontal mold 6 on the dividing surfaces 10 and 11, and do not slide. Of the rotations of the movable inserts 7 and 8 about the rotation axis 9, the rotational force for the rotation on the open side is the frictional force (including the adhesive force) between the movable inserts 7 and 8 and the cast product, and is closed. The turning power of the side rotation is a pressing force after the opposing movable telescopic nests hit each other when the opposing horizontal assemblies 3 approach each other. Therefore, the rotating force of the movable inserts 7 and 8 about the rotation axis 9 is not generated by a dedicated cylinder as in the conventional case, but a dedicated cylinder for opening and closing the movable inserts is installed between the horizontal die 6 and the movable inserts 7 and 8. Not not.

Regarding the opening / closing drive configuration of the horizontal type 6, the cylinder connecting plate 21 is fixed to the rod of the cylinder 5,
A connecting plate 20 is connected to the horizontal die 6, and by connecting the cylinder connecting plate 21 and the connecting plate 20, the opening / closing driving force of the cylinder 5 is transmitted to the horizontal die 6 to open / close the pair of horizontal die 6. Although FIG. 1 shows an example in which each horizontal mold 6 is driven by the rods of two cylinders 5, each horizontal mold 6 may be driven by the rod of one cylinder 5.

Next, the structure peculiar to each embodiment of the present invention will be described. In the first embodiment, as shown in FIGS. 1 and 2, the movable inserts 7 and 8 have a cavity 4 on the inner circumference.
Has surfaces 7a and 8a that define a part of the
In the portions 7b and 8b which are separated from a in the radial direction of the cavity,
It is supported rotatably around a rotary shaft 9 fixed to the horizontal die 6. In the illustrated example, the movable inserts 7 and 8 have surfaces 7a and 8a.
To the connecting portions 7b, 8b in a direction orthogonal to the horizontal mold opening / closing direction A, outwardly, bent substantially at right angles to the horizontal mold opening / closing direction A, and away from the facing movable insert. Surfaces 7a and 8a and cavity 6 of horizontal mold 6
The intersections 14 and 15 with a (the same as the intersections between the dividing surfaces 10 and 11 and the cavity defining surface 3a) are on the line connecting the axis of the rotating shaft 9 and the center of the cavity, or in the vicinity thereof. , 8 are rotated about the rotation axis 9, the intersections 14 and 15 are prevented from rotating in the tangential direction of the cast product and biting into the cast product. A stopper 22 is provided between the movable inserts 7 and 8 and the horizontal die 6. One end of the stopper 22 is a horizontal type 6 by the rotating shaft 23.
The other end of the stopper 22 is slidably connected via a shaft 24 to an oblique elongated hole 25 formed in the movable inserts 7 and 8. The movable inserts 7 and 8 are shaped and shaped such that the elongated holes 25 are stopped by the stoppers 22 when the movable inserts 7 and 8 rotate about the rotation axis 9 by a predetermined angle, for example, 10 °. The rotation range of the movable inserts 7 and 8 is set to the above-described predetermined angle, for example, 10 °, as an opening degree at which the mold release is completed and the resistance when the mold is closed is minimized.

In the second embodiment, as shown in FIGS. 3 and 4, the split faces 10, 1 of the movable inserts 7, 8 and the horizontal die 6 are divided.
No. 1 is oriented so that its extension line passes through the center of the cavity when the horizontal mold is closed. The movable inserts 7 and 8 have an outer surface 7c which is aligned with the outer surfaces 6b and 6c of the horizontal mold 6 when the movable inserts 7 and 8 come into close contact with the horizontal mold 6 at the dividing surfaces 10 and 11.
8c. Further, when the horizontal die 6 is in the most open position, it is located outside the outer surfaces 7c, 8c of the movable inserts 7, 8, or on the outer surface 7c of the movable insert during the opening of the horizontal die 6,
A movable nest restricting means 26 for closing the movable nests 7 and 8 in the opened state is provided at a position where 8c passes, but at a position where the horizontal mold 6 does not interfere with the movable nest 6 when the mold 6 is at the closed position. There is. The movable nest regulation means 26 is a stationary member, and is fixed to the lower mold 2, for example. The movable nest restricting means 26 is in sliding contact with the movable nests 7 and 8, and the movable nest 7,
The reaction force from 8 is used to close the movable inserts 7, 8. A slight gap may be provided between the movable nest restricting means 26 and the movable nests 7 and 8.

In the third embodiment, as shown in FIGS. 5 and 6, the split faces 10, 1 of the movable inserts 7, 8 and the horizontal mold 6 are divided.
No. 1 is oriented so that its extension line passes through the center of the cavity when the horizontal mold is closed. The movable inserts 7 and 8 have recesses 28 that open to the split surfaces 10 and 11, and the horizontal mold 6 has recesses 29 that open to the split surfaces 10 and 11. Pins 30 are provided in the recesses 28. And the pin 3 is provided in the recess 29.
1 is provided, and a tension spring 27 is provided between the pin 30 and the pin 31. The tension spring 27 is the third
In the embodiment, the movable insert restricting means 26 is configured to close the movable inserts 7 and 8 with respect to the horizontal mold 6 when the horizontal mold 6 is opened and in the fully open position. However, the strength of the tension spring 27 is
When the horizontal mold 6 starts to open from the closed state, the movable inserts 7 and 8 must be able to open from the horizontal mold 6 against the tension spring 27 by the frictional force with the cast product.

Next, the operation of the first, second and third embodiments will be described. When the horizontal die assembly 3 is pulled by the rod of the cylinder 5 to open the die, the movable inserts 7 and 8 rotate relatively to the open die 6 with respect to the horizontal die 6 about the rotating shaft 9 due to the frictional force with the cast product. Therefore, the movable inserts 7 and 8 move in a direction inclined from the horizontal moving direction, and even if no draft is provided, galling of the cast product in the milling portion of the horizontal assembly 3 is prevented or suppressed. In addition, since the intersection of the dividing surfaces 10 and 11 and the cavity defining surface does not bite into the cast product during opening and closing, it is not necessary to add extra meat to the product, and the cutting in the post process is reduced or unnecessary. can do. When the movable inserts 7 and 8 are opened from the horizontal mold 6, the movable inserts 7 and 8 are automatically opened with respect to the horizontal mold 6 by receiving a frictional force with a casting product, and a dedicated cylinder is provided for opening and closing the movable inserts 7 and 8 with respect to the horizontal mold 6. No need. Therefore, the mold does not become large and the structure is simplified.

In particular, the second and third embodiments have the following effects. That is, if the movable inserts 7 and 8 remain open with respect to the horizontal mold 6 when the horizontal mold 6 is opened, when the horizontal mold 6 is closed, the corners of the movable inserts come into contact with each other. There is a risk that the corner portion of 8 will wear out early, and if the corner portion of one movable insert 7 or 8 hits the side surface of the other movable insert 7 or 8 facing it, it will lock and the horizontal type 6 When the other movable inserts 7 or 8 are moved closer to each other, the force in the direction perpendicular to the horizontal mold opening / closing direction is received from the one movable mold insert 7 or 8, and as shown in FIG. There is a possibility that a shift 110 may occur in the direction perpendicular to. However, in the molds of the second and third embodiments, when the horizontal mold 6 is opened, the movable nest restricting means 26 and 27 close the movable nests 7 and 8. Problem does not occur.

[0016]

According to the first aspect of the present invention, the movable insert is rotatably connected to each side of the horizontal die, and the friction between the movable insert and the casting product is utilized to move the movable insert with respect to the horizontal die. Since it is designed to open relatively, there is no need to provide a dedicated cylinder for opening and closing the movable insert, making the mold smaller, simpler, and more reliable in operation.
It is possible to reduce costs. According to the second aspect, since the movable insert restricting means is provided, when the horizontal mold is opened, the movable insert restricting means closes the movable insert, and the corner of the movable insert wears the movable insert. It is possible to prevent the generation of a step in

[Brief description of drawings]

FIG. 1 is a plan view of a mold according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of portion C in FIG.

FIG. 3 is a plan view of a mold according to a second embodiment of the present invention, which is in the process of opening.

FIG. 4 is a plan view of the mold according to the second embodiment of the present invention in a fully opened state.

FIG. 5 is a plan view of the mold according to the third embodiment of the present invention, which is in the process of opening.

FIG. 6 is a plan view of the mold according to the third embodiment of the present invention in a fully opened state.

FIG. 7 is a front view of a mold according to an embodiment of the present invention.

FIG. 8 is a plan view of a horizontal mold of a mold of a comparative example showing a state in which a step is formed in the cutout portion.

FIG. 9 is a plan view of a horizontal mold of a conventional mold.

10 is an enlarged view of part D in FIG.

[Explanation of symbols]

 1 Upper Die 2 Lower Die 3 Horizontal Type Assembly 4 Cavity 5 Cylinder 6 Horizontal Type 7 Movable Nest 8 Movable Nest 9 Rotating Axis 10 Dividing Face 11 Dividing Face 12 Mating Face 13 Mating Face 14 Intersection 15 Intersection 20 Coupling Plate 21 Cylinder Connecting Plate 26 Movable nest regulation means 27 Movable nest regulation means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takayuki Baba 1 Toyota-cho, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd. (72) Inventor Yukihiro Shibata 1-cho, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd. ( 72) Inventor Tsuyoshi Yoshikawa 2-1, Asahi-cho, Kariya city, Aichi Prefecture Aisin Seiki Co., Ltd.

Claims (2)

[Claims] 1. A pair of openable and closable horizontal dies, and rotatably connected to each side of each horizontal dies by a rotary shaft. Rotational power of the open side of the rotation around the rotary shaft is a cast product. A mold having a movable insert that is said to have a frictional force with the mold. 2. A pair of openable and closable horizontal molds, and rotatably connected to each side part of each horizontal mold by a rotary shaft, and the rotational force of the open side rotation of the rotary products about the rotary shafts is a casting product. A movable nest that is a frictional force with the movable nest, and a movable nest restricting unit that is provided for the movable nest and closes the movable nest when the pair of horizontal molds are opened. Mold to do.