JPH0539742U - Vertical pressure casting equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] A single device can reliably prevent the molten metal from flowing back into the hot water supply pipe at the time of pressure filling, and can adjust the required molten metal filling amount in the cavity to supply hot water. A mold pressure casting device is provided. [Structure] A hot water supply pipe 3 is attached to a plunger sleeve 1 installed in a vertical direction with a straight upward inclination, and inside the hot water supply pipe 3 is a molten metal outlet 5 opened in the plunger sleeve 1 of the hot water supply pipe 3. The hot water supply tip 4 for closing the above was inserted so as to be able to move forward and backward.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vertical pressure casting apparatus for pressurizing and filling molten metal into the cavity of a mold by solidification under high pressure by vertically moving a plunger tip in a plunger sleeve.

[0002]

[Prior Art]

 Conventionally, a vertical pressure casting device has a plunger sleeve that can be vertically moved in the vertical direction directly below the mold and can be tilted between a position directly below and a lateral position, and a plunger sleeve in the vertical direction. It is known that the hot water supply pipe is installed obliquely in the middle of this plunger sleeve.

In the former vertical pressure casting apparatus, at the time of hot water supply, the plunger sleeve is pulled out from the guide at the bottom of the mold and tilted to the side position, and then the molten metal is poured into the plunger sleeve opened by the ladle. Then, after returning the plunger sleeve to the position directly below the original mold and fitting it in the guide at the bottom of the mold, move the plunger tip upward in the plunger sleeve to move the poured molten metal into the mold cavity. The molten metal is pressure-filled from below.

However, in this vertical pressure casting device, not only the pressure cylinder that moves the plunger tip up and down in the plunger sleeve but also the plunger sleeve in which the plunger tip is inserted and the pressure cylinder is tilted. Since a large tilting cylinder is required, and moreover, accurate position control of the tilting cylinder is required to stop the plunger sleeve at a predetermined position just below the mold, the equipment becomes large and expensive. In addition, since the fitting part of both parts is worn because the plunger sleeve is inserted into and removed from the guide under the mold, appropriate maintenance is required.

Further, in the latter vertical pressure casting apparatus, after the molten metal is supplied into the plunger sleeve through the hot water supply pipe, the plunger tip is moved up in the plunger sleeve to add the molten metal into the cavity of the mold. Since the pressure filling is performed and the plunger sleeve is not tilted, there is no inconvenience that the former vertical pressure casting device has.

However, in this vertical pressure casting device, when the mold is located below the connection position of the hot water supply pipe, the molten metal is supplied into the plunger sleeve, and then the sub-plunger tip is moved downward to move the hot water supply pipe. After closing the opening, the plunger tip and sub-plunger tip work together to compress the melt in the plunger sleeve and pressurize the melt in the cavity of the mold. If it is above, the sub-plunger tip that closes the opening of the hot water supply pipe cannot be provided inside the plunger sleeve, so when the plunger tip is moved up, part of the molten metal that has been supplied to the inside of the plunger sleeve inside the hot water supply pipe. Backflow, the actual molten metal filling amount in the cavity was less than the required molten metal filling amount, and good molding could not be performed. There was a risk of becoming.

Therefore, in order to eliminate the above-mentioned inconvenience of the vertical pressure casting device in which the mold is provided at a position above the hot water supply pipe of the plunger sleeve installed in the vertical direction, It is divided into a movable sleeve and an outer fixed sleeve, and a hot water supply pipe is installed obliquely on the fixed sleeve, and a plunger tip is slidably provided inside the movable sleeve, and the movable sleeve is moved downward to move the hot water supply pipe inside the fixed sleeve The molten metal is supplied in a state where the opening is opened, and then the movable sleeve is moved up together with the plunger tip to a position where it overlaps with the original fixed sleeve, and then the plunger tip is moved up in the movable sleeve to move the hot water supply pipe by the movable sleeve. It has been disclosed that the molten metal is charged under pressure into the cavity of the mold while the opening of the mold is closed (JP-A-55-106667). (See the official gazette).

[0008]

[Problems to be solved by the device]

 However, in the vertical pressure casting device, since the plunger sleeve is a double sleeve for opening and closing the opening of the hot water supply pipe, the structure is complicated and a vertical moving device for the movable sleeve is required. For example, for a plunger sleeve with the same outer diameter, the plunger tip must be made smaller despite the disadvantage in pressure filling. Further, there is a disadvantage that a hot water supply device needs to be separately provided on the hot water supply pipe side in order to supply a required amount of molten metal filled in the cavity of the mold.

The present invention has been made to solve the above-mentioned problems, and it is possible to surely prevent the molten metal from flowing back into the hot water supply pipe at the time of pressurizing and filling with one device, and to reduce the necessary amount of molten metal to be filled in the cavity. It is an object of the present invention to provide a vertical pressure casting device capable of adjusting and supplying hot water.

[0010]

[Means for Solving the Problems]

 In this invention, molten metal is supplied from a hot water supply pipe connected to the plunger sleeve onto the plunger tip in the plunger sleeve installed in the vertical direction, and the plunger chip is moved up through the plunger sleeve into the cavity of the mold. In a vertical pressure casting device that pressurizes and fills the molten metal, a hot water supply pipe is attached to the plunger sleeve in a linearly inclined manner, and the molten metal outlet that is open in the plunger sleeve of the hot water supply pipe is closed in the hot water supply pipe. The hot water supply tip is slidably inserted.

[0011]

[Action]

 When the hot water supply tip is moved upward from the retracted position in the hot water supply pipe during hot water supply, the molten metal in the molten metal pool formed between the front part of the hot water supply tip and the molten metal outlet of the hot water supply pipe is pushed by the hot water supply tip. Through the molten metal outlet and fall into the plunger sleeve.

When the hot water supply tip has advanced to the molten metal outlet of the hot water supply pipe and the hot water supply is completed, the molten metal outlet of the hot water supply pipe is blocked at the front part of the hot water supply tip. For this reason, when the plunger tip is moved up in the next pressurizing and filling process, the molten metal in the spillage pool formed on the plunger tip in the plunger sleeve does not escape to the hot water supply pipe side and enters the mold cavity. It is filled under pressure. At that time, the hot water supply tip that has blocked the molten metal outlet of the hot water supply pipe does not interfere with the upward movement of the plunger tip.

[0013]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional view showing an outline of the apparatus, and FIG. 2 is a plan view showing a molten metal tip.

In FIG. 1, reference numeral 1 denotes a plunger sleeve installed in the vertical direction, and a plunger tip 2 is vertically slidably fitted in the plunger sleeve 1.

Reference numeral 3 denotes a hot water supply pipe, which is attached to the plunger sleeve 1 in a linearly inclined manner.

A hot water supply tip 4 is slidably fitted in the hot water supply pipe 3.

At the forward end position, the hot water supply tip 4 closes the molten metal outlet port 5 that is opened in the plunger sleeve 1 of the hot water supply pipe 3, and at the retracted end position a molten metal pool portion 6 is formed between the molten metal outlet port 5 and the molten metal reservoir portion 6. Form.

A hot water supply port 7 is provided at a predetermined position above the hot water supply pipe 3 so as to face the molten metal pool portion 5, and a band heater 8 is provided on the outer surface of the upper end of the hot water supply pipe 3.

At the front portion of the hot water supply tip 4, there is provided an extrusion front surface portion 9 (in the embodiment, a circular arc concave portion) continuous with the inner surface of the plunger sleeve 1 at the forward end position.

Reference numeral 10 denotes a spillage pool, which is formed between the melt spillage gate 6 of the hot water supply pipe 3 and the upper portion of the plunger tip 2 at the lower limit position.

Next, the operation of the vertical pressure casting device configured as described above will be described.

While the molten metal temperature is prevented from lowering by the band heater 8, the molten metal M is poured from the ladle 11 into the molten metal pool portion 6 through the molten metal inlet 7, and then the hot water supplying tip 4 is moved upward by a cylinder (not shown). The molten metal M in the molten metal pool portion 6 is pushed by the molten metal feed tip 4 and falls through the molten metal drainage port 5 of the molten metal feed pipe 3 into the molten metal pool portion 10 in the plunger sleeve 1.

In the state where the hot water supply tip 4 has advanced to the molten metal outlet 5 of the hot water supply pipe 3 to complete the hot water supply, the molten metal outlet 5 of the hot water supply pipe 3 is blocked at the front part of the hot water supply tip 4. . Therefore, when the plunger tip 2 is moved upward in the next pressurizing and filling step, the molten metal M in the falling water pool portion 10 formed on the plunger tip 2 in the plunger sleeve 1 does not escape to the hot water supply pipe 3 side. It is filled under pressure in the cavity of the mold. At this time, since the extruding front surface portion 9 formed on the front portion of the hot water supply tip 4 is formed so as to be continuous with the inner surface of the plunger sleeve 1, the hot water supply chip 4 that blocks the molten metal outlet 5 of the hot water supply pipe 3 Does not interfere with the movement of the plunger tip 2.

Further, when the hot water supply tip 4 is in the position shown in the drawing, for example, the amount V of molten metal in the molten metal reservoir 6 is: V = V0 + A × L V0; Amount of molten metal stored in front A: Cross-sectional area in the hot water supply pipe 3 L: It is expressed by the distance that the hot water supply tip 4 retracts from the position shown, and V0 is also determined by the mounting angle of the hot water supply pipe 3 with respect to the plunger sleeve 1. In combination with the fact that the molten metal M is prevented from escaping, it is possible to adjust the position of the hot water supply tip 4 to prepare a necessary molten metal filling amount in the cavity.

[0026]

[Effect of the device]

 As described above, according to the present invention, the hot water supply pipe is attached to the plunger sleeve by inclining linearly upward, and the hot water supply tip for closing the molten metal outlet opening in the plunger sleeve of the hot water supply pipe is slid in the hot water supply pipe. When the plunger tip is moved in the next pressurizing and filling process, the molten metal in the spillage pool can be plugged in at the front of the hot water supply tip when the hot water supply is completed. Does not escape to the hot water supply pipe side. Also, the hot water supply tip can be easily made into a structure that does not interfere with the upward movement of the plunger tip by devising the front shape. In addition, because the molten metal in the spillage pool does not escape to the hot water supply pipe side, the required amount of molten metal to be filled in the cavity can be reliably prepared by adjusting the position of the hot water supply tip. Therefore, it is possible to pressurize and fill the required amount of molten metal in the cavity of the mold by the upward movement of the plunger tip, so that the moldability and yield can be improved, and the required molten metal in the cavity in the hot water supply pipe can be achieved. Since the filling amount of the hot water can be adjusted easily and surely, it becomes possible to easily cope with the mold change. In addition, the equipment is simple and inexpensive because only one device is required.

[Brief description of drawings]

FIG. 1 is a vertical sectional view schematically showing an embodiment of the present invention.

FIG. 2 is a plan view showing a molten metal tip.

[Explanation of symbols]

 1 Plunger sleeve 2 Plunger tip 3 Hot water supply pipe 4 Hot water supply tip 5 Molten metal outlet 7 Hot water inlet 9 Extrusion front part M Molten metal

Claims (1)

[Scope of utility model registration request] 1. The molten metal is supplied from a hot water supply pipe connected to the plunger sleeve onto the plunger tip in the plunger sleeve installed in the vertical direction, and the upward movement of the plunger tip causes the molten metal to pass through the plunger sleeve into the cavity of the mold. In a vertical pressure casting device that pressurizes and fills the molten metal, a hot water supply pipe is attached to the plunger sleeve in a linearly inclined manner, and a molten metal outlet opening in the plunger sleeve of the hot water supply pipe is closed in the hot water supply pipe. A vertical pressure casting device having a hot water supply tip slidably fitted therein.