JPH0666854U - Local pressure device in casting mold - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a molten metal local pressure device in a casting mold capable of installing a molten metal local pressure pin at a desired position regardless of the installation position of a core hydraulic cylinder. [Structure] A pressurizing cylinder 21 is installed inside the core 7, and a pressurizing pin 22 for locally pressurizing the molten metal in the cavity 40 is connected to the cylinder. In order to drive the pressurizing cylinder by hydraulic pressure, a forward hydraulic hose 25 and a reverse hydraulic hose 26 are connected to the pressurizing cylinder, and the hoses 25, 26 are connected to an external hydraulic device. [Effect] The molten metal can be pressurized at any desired position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a local pressurizing device in a casting mold, and more particularly to a local pressurizing device in a casting mold that can locally press a desired location of the molten metal filled in the mold cavity. .

[0002]

[Prior art]

 In casting such as die casting, in order to remove defects in the cast product, a piston provided slidably through the mold is pushed toward the mold cavity in the process of filling the melt, and the melt is localized. The technique of pressurizing the sheet has been conventionally practiced, and is described in, for example, JP-A-60-121058.

In the invention described in the publication, the core hydraulic cylinder is installed at substantially the center of one end side of the core holder (slide core holder), and in conjunction with the sliding movement of the core holder, A pressure pin (piston) penetratingly formed in the core holder reciprocates in the core die (slide core) facing the cavity to locally press a part of the molten metal in the cavity. Has been done.

Therefore, one end of a slide rod connected to a hydraulic cylinder is connected to a core holder, a guide bush fixed to the core holder is located on the outer peripheral surface of the slide rod, and the slide rod is a guide bush. It is provided slidably with respect to. Further, a slide plate having a piston fixed thereon is slidably provided on the outer peripheral surface of the guide bush, and a cam is provided between the slide plate and the slide rod. With this configuration, when the slide rod slides in the axial direction by the operation of the hydraulic cylinder, the slide plate moves in the cavity direction on the guide bush by the action of the cam, and the tip of the piston presses a part of the molten metal. .

[0005]

According to such a conventional molten metal local pressurizing mechanism, the core hydraulic cylinder 10 is installed at approximately the center of the core, and the pressurizing pin (piston) is at the center of the core. Since there is no choice but to install it in a position separated from the part, there is a drawback that the pressing position is limited only to the peripheral part of the cast product.

Further, when casting an undercut-shaped casting, it is necessary to incline the movable core mechanism according to the inclination angle, but it is necessary to provide the movable pin mechanism in close proximity to the desired pressing position of the pressing pin. If so, the movable core mechanism and the molten metal pressurizing mechanism interfere with each other, making it impossible to install the movable core device.

Further, in the conventional configuration, since the pressurizing mechanism is installed outside the slide core holder, the cam portion, the sliding portion between the guide bush and the slide plate, the sliding between the slide rod and the guide bush, and the like. Fine burrs generated in the casting process or powder such as graphite contained in the mold release agent may enter the part, resulting in frequent sliding failure.

In view of the above, the present invention overcomes the above-mentioned conventional problems and, regardless of the installation position of the hydraulic cylinder for the core, avoids mechanical buffering and allows the molten metal local pressing pin to be installed at a desired position. It is an object to provide a molten metal local pressurizing device in a mold.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides: (a) a pressurizing cylinder installed inside the core; and (b) one end of which can protrude into the cavity to pressurize the molten metal locally. A pressurizing pin connected to and driven by the pressurizing cylinder so as to be able to reciprocate inside the core; and (c) a hydraulic device provided at a position away from the core for driving the pressurizing cylinder. There is provided a molten metal local pressurizing device in a casting mold, which has a pressurizing hose connected to the pressurizing cylinder and connected to the pressurizing cylinder.

[0010]

With the local pressure device in the casting die of the present invention having the above-described structure, the molten metal local pressure device is actuated during the filling of the molten metal to locally press the molten metal in the cavity. That is, the hydraulic device is operated to apply hydraulic pressure to the hydraulic hose, and the pressurizing cylinder is operated to advance the pressurizing pin 22. Therefore, the tip of the pressurizing pin protrudes into the cavity and locally pressurizes the molten metal. After a lapse of a predetermined time, the hydraulic hose is operated to retract the pressure pin from the cavity surface.

[0011]

【Example】

 A molten metal local pressure device in a casting mold according to an embodiment of the present invention will be described with reference to FIG.

In FIG. 1, the movable mold 1 comprises a movable holder 2 and a movable die 3, and the movable holder 2 and the movable die 3 are fixed by a socket screw (not shown). Further, the fixed mold 4 comprises a fixed holder 5 and a fixed die 6, both of which are fixed by a socket screw (not shown). A core 7 is installed between the movable mold 1 and the fixed mold 4, and the core 7 is composed of a core holder 8 and a core die 9, both of which are fixed by a socket screw (not shown). A core hydraulic cylinder 10 for sliding the core 7 in the left-right direction in FIG. 1 is installed at one end of the core holder 8. A cavity 40 is defined by the movable die 3, the fixed die 6, and the core die 9.

A molten metal local pressure device 20 is provided inside the core 7. The pressurizing device 20 includes a pressurizing pin 22 for pressurizing the molten metal so that one end thereof can enter the cavity 40, and a pressurizing pin for operating the pressurizing pin 22 generally arranged in the core die 9. It has a cylinder 21, a pressurizing cylinder 21, a forward hydraulic hose 25, and a reverse hydraulic hose 26. The forward hydraulic hose 25 and the reverse hydraulic hose 26 are provided so as to pass through the inside of the core holder 8 and are connected to a hydraulic device (not shown). The pressurizing pin 22 and the pressurizing cylinder 21 are connected by a connecting part 23, and the connecting part 23 is screwed to the male screw on the rear part of the pressurizing pin 22 and to the tip of the pressurizing cylinder 21. It is configured by screwing with the female screw.

Inside the core 7, a movable core mechanism 30 for casting an inclined undercut shape is further arranged. The movable core mechanism 30 includes a casting pin 33 that moves through the core, a hydraulic cylinder 31 located outside the core 7 for reciprocally sliding the casting pin 33, and the casting core 33. It has a removal pin 33 and a rod 32 that connects the hydraulic cylinder 31.

Next, the operation of the pressurizing device 20 will be described together with the operation of the casting machine. The core 7 is moved forward by the core hydraulic cylinder 10, and the movable mold 1 is moved in the direction of the fixed mold 4 to perform mold clamping. Then, the molten metal is injected through an injection sleeve of a casting machine (not shown) to fill the cavity 40 with the molten metal. During the filling of the molten metal, the molten metal local pressure device 20 operates to locally press the molten metal in the cavity 40. That is, a hydraulic device (not shown) is operated to cause the forward hydraulic hose 25 to apply hydraulic pressure, and the pressurizing cylinder 21 is actuated to advance the pressurizing pin 22 to pressurize the molten metal.

After a lapse of a certain period of time, hydraulic pressure is applied to the hydraulic hose 26 for retreating, and the pressure pin 22 is retracted from the surface of the cavity 40. Then, the mold is opened after the molten metal is solidified, the hydraulic cylinder 31 of the movable core mechanism 30 is operated, and the casting pin 33 is retracted. Next, the core hydraulic cylinder 10 is operated to retract the core 7.

Next, the extruded pin (not shown) is operated to separate the cast product from the cavity 40, so that the cast product is taken out. Then, an extruding plate (not shown) supporting the extruding pins is retracted, the mold is cleaned, the release agent is applied, and the mold is clamped for the next step.

Next, a second embodiment of the molten metal local pressure device in the casting mold according to the present invention will be described with reference to FIG. The second embodiment relates to an improvement of the pressurizing cylinder part, in which the rear part of the pressurizing pin 122 is a piston part 122a in the pressurizing cylinder 121, and the piston part 122a which slides with respect to the cylinder 121. A ring groove 122b is formed on the outer peripheral surface side, and a piston ring 122c is mounted in the ring groove 122b.

A plug member 122 d is fitted on the tip side (pressure pin 122 side) of the pressure cylinder 121, and an O-ring 122 e is attached between the pressure pin 122 and the plug member 122 d. At the same time, an O-ring 122f is attached between the plug member 122d and the inner peripheral surface of the cylinder 121. The rear side of the piston 122a is connected to the forward hydraulic hose 25 through a passage 122g, and the front side of the piston 122a is connected to the reverse hydraulic hose 26 through a passage 122h.

The operation of the second embodiment is also similar to that of the first embodiment, and the description thereof is omitted. However, in the second embodiment, the pressurizing pin 122 and the cylinder 121 are integrally connected, and therefore, the operation of the second embodiment is further improved. The compact pressure device 20 can be configured.

The present invention is not limited to the above-described embodiments, and various modifications and improvements can be made within the technical matters described in the scope of claims for utility model registration.

[0022]

[Effect of device]

 According to the molten metal local pressure device in the casting die of the present invention described in detail above, it is possible to press the molten metal at any desired position by installing the pressure portion inside the core. Since the installation position of the pressurizing cylinder can be arbitrarily selected, the pressurizing unit can be installed inside the core die or the core holder even within the installation range of the core hydraulic cylinder 10, and the mechanical pressure can be increased. The pressurizing unit can be provided without interference.

In addition, even if the movable core mechanism is installed in the core and therefore the pressurizing cylinder cannot be installed behind the core due to the mold structure, the pressurizing cylinder is installed inside the core in the present invention. Since it is scraped, it is possible to pressurize a desired molten metal portion. In addition, since the pressurizing part is provided inside the core, burrs and powder of graphite or the like in the release agent do not invade into the pressurizing part, and the problem of sliding failure does not occur. Therefore, efficient casting work can be performed.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a part of a casting machine having a molten metal local pressure device in a casting mold according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing a molten metal local pressing device in a casting mold according to a second embodiment of the present invention.

[Explanation of symbols]

 7 core 8 core holder 9 core die 21 pressurizing cylinder 22 pressurizing pin 25 forward hydraulic hose 26 reverse hydraulic hose 40 cavity

Claims (1)

[Scope of utility model registration request] 1. A pressurizing cylinder installed inside a core, one end of which can project into the cavity for pressurizing a local portion of the molten metal, and is reciprocated in the core by being connected to and driven by the pressurizing cylinder. A pressurizing pin provided so as to be movable and a hydraulic device provided at a position separated from the core for driving the pressurizing cylinder are connected, and pass through the inside of the core to connect to the pressurizing cylinder. A molten metal local pressurizing device in a casting mold.