JPH0741392B2 - Pressure casting equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure casting apparatus used in a pressure casting method such as die casting (pressure die casting) and molten metal forging, and more specifically, a higher gate block and a lower pressure plunger. The molten metal in the molten metal storage space is temporarily stored in the molten metal storage space by supplying hot water to the space in the mold formed between the molten metal and the molten metal in the molten metal storage space by closing the molten metal in the molten metal storage space. The present invention relates to a pressure casting device that is pressure-filled in a product part space (cavity).

[0002]

2. Description of the Related Art FIG. 6 shows a conventional pressure casting apparatus of this type.
There is a structure shown in. FIG. 6 shows an upper mold 101 and a lower mold 10.
2 and 2 are butted against each other on the parting surface 103 and clamped, and the upper and lower molds 101 and 102 form a product part space (cavity) R.
The upper mold 101 and the lower mold 102 are provided with sleeves 104 and 105 located on the same axis,
On the sleeve 104 on the upper die 101 side, a hot water supply runner portion 106 is formed so as to extend obliquely upward.

Then, the sleeve 10 on the side of the upper die 101.
4, a gate closing plunger 107 is inserted in the lower mold 102 side sleeve 105, and a pressure plunger 108 is inserted in the sleeve 105 so as to be vertically movable.
Numeral 7 is adapted to slide vertically in the sleeve 104 or 105 by the function of the gate closing cylinder 109 and the pressure plunger 108 by the function of the pressure cylinder 110, respectively.

Therefore, in the mold clamping state shown in FIG. 6, the pressurizing plunger 108 is held at a position so as to close the gate portion 111 communicating with the product space R, while the gate closing plunger 107 is connected to the sleeve 104. It is held at a position that allows communication with the hot water supply runner part 106, and hot water is supplied from the upper opening of the hot water supply runner part 106 using a ladle 112. As a result, the molten metal M is temporarily stored in the space C formed between the pressure plunger 108 and the gate closing plunger 107.

When a predetermined amount of molten metal M is supplied onto the pressure plunger 108, the spout closing plunger 1
07 is lowered, and the sleeve 104 and the hot water supply runner part 10
Cut off communication with 6. Further, the pressure plunger 1
08 and the spout closing plunger 107 pressurize the molten metal M while lowering these plungers 107 and 108 in synchronization with each other. When the pressure plunger 108 is lowered to the position where the gate portion 111 is opened, the pressure plunger 108 is stopped, and thereafter, the molten metal M is pressure-filled in the product space R only by the downward movement of the gate closing plunger 107.

In the pressure casting apparatus shown in FIG. 6, a local pressure cylinder 113 is provided on the upper die 101 side and the ejector plate 1 is attached to the lower die 102.
An ejector mechanism 116 including 14 and an ejector pin 115 is provided. The local pressing cylinder 113 operates after the molten metal M is filled in the product space R to locally press a part of the molten metal M, while the cast product is opened. Later ejector mechanism 1
16 is projected above the lower mold 102.

[0007]

In the conventional pressure casting apparatus as described above, the pressure plunger 108 inserted in the sleeve 104 or 105 and the gate closing plunger 107 face each other, and both of them. Since the pressurizing forces oppose each other, the upper and lower plungers 107, 10
Not only is it difficult to adjust the operating balance of No. 8, it is necessary to incorporate a spout closing mechanism centered on a spout closing plunger 107 for cutting off the communication between the sleeve 104 and the hot water supply runner 106 into the mold.

As a result, as shown in FIG.
There is a problem that the structure of No. 1 becomes complicated, and the degree of freedom of the casting plan centering on the layout of the product space R is significantly restricted.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a pressure casting apparatus in which the structure of the mold itself is simplified.

[0010]

According to the present invention, the space formed between the upper gate closing block and the lower pressure plunger is supplied with hot water from the hot water supply passage to temporarily store the molten metal. a molten metal of the molten metal storage space in terms of closing the hot water supply runner section a pressure casting apparatus that is pressure filled into the product portion space, the upper mold and allowed dynamic platen fixed to the fixed platen A product part space formed between a fixed lower mold and a spout part of the upper mold that opens on the upper surface of the upper mold, and a lower mold that are vertically movable and the opening of the spout part is closed. After that, a pressure plunger that moves up and pressurizes and fills the molten metal in the molten metal storage space into the product part space, and a vertical sleeve supported by the fixed platen and connected to the opening part of the sprue part, Formed on the fixed platen,
A hot water supply runner part connected to the sleeve at a position above the opening of the sprue part of the sleeve, and an opening part of the sprue part and a hot water supply runner inserted into the sleeve through the sleeve. Gate opening block that allows communication with the gate and a gate closing block that slides up and down between the gate opening and the gate closing position that cuts off the communication between the hot water supply channel and the fixed platen. Is provided above the gate closing block at the gate closing position, and moves forward and backward into the sleeve from a direction orthogonal to the sliding direction of the gate closing block, and at the forward position, the upper surface side of the gate closing block And a backup block that abuts on the gate to restrain the gate closing block at the gate closing position.

[0011]

According to this structure, hot water is supplied from the hot water supply spout portion while the hot water spout blocking block allows the hot water supply runner and the spout to communicate with each other. As a result, the molten metal is temporarily stored in the space sandwiched by the pressure plunger and the gate closing block.

After the hot water is supplied, the gate closing block is lowered to cut off the communication between the hot water supply passage and the gate, and the backup block is further advanced to abut the upper surface of the gate closing block.

After that, by raising the pressurizing plunger alone, the molten metal previously stored in the molten metal storage space is pressurized and filled in the product part space. At this time, the pressing force applied to the molten metal is also applied to the sprue block as it is, but since the spout block itself is substantially locked by the backup block, the spout block sufficiently opposes the molten metal pressure. be able to.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 2 and 3 are structural explanatory views showing an embodiment of the present invention, in which an upper die 4 having a sprue portion 3 formed on a lower surface of a stationary platen 2 forming a part of a frame 1 . Is fixed to the movable platen 7 that is vertically moved along the rail 6 by being vertically moved by the mold clamping cylinder 5 and the lower mold 8
Is fixed. Then, the upper die 4 and the lower die 8 are clamped to form a product space (cavity) 9 therebetween.

The lower die 8 is provided with a pressure plunger 11 which is driven to move up and down by a pressure cylinder 10. The pressure plunger 11 is located on the same axis as the gate 3 and will be described later. A molten metal storage space C communicating with the product space 9 is formed together with the sprue block block 15.

On the other hand, a sleeve 12 located on the same axis as the pressurizing plunger 11 is inserted into the fixed platen 2 so as to be connected to the sprue part 3 and is arranged adjacent to the sleeve 12. A hot water supply runner 13 is formed, and a hopper 14 is connected to the hot water supply runner 13. The hot water supply runner portion 13 is connected to the sleeve 12 so as to communicate with the sleeve 12 at a position above the opening of the sprue portion 3 of the sleeve 12.

The sleeve 12 has a sprue block 1
5 is inserted, and the gate closing block 15 is moved up and down according to the expansion and contraction operation of the gate closing cylinder 16 provided on the fixed platen 2. That is, the gate closing block 15 allows the gate opening position P ₁ (FIGS. 2 and 3) that allows the opening of the gate 3 and the hot water supply passage 13 to communicate with each other.
Position), and a gate closing position P ₂ (FIGS. 1, 4) that blocks the communication between the opening of the gate part 3 and the hot water supply runner part 13.
(The position shown in FIG. 5) and slides vertically.

Further, the fixed platen 2 is provided with a backup block 17 which is slidable in the horizontal direction, and the backup block 17 is slid by the action of a cylinder 18. Further, since the window portion 19 through which the backup block 17 can be inserted is formed in the sleeve 12, the gate closing block 15 is located at the gate closing position P ₂ (shown in FIGS. 1, 4 and 5) as described later. When the backup block 17 is in the (position), the backup block 17 enters the sleeve 12 and contacts the upper surface of the gate closing block 15.

An air blow hole 20 is formed in the gate closing block 15. An opening 20a at one end of the air blow hole 20 is directed toward the inner peripheral surface side of the sleeve 12, while the other end of the air blow hole 20 is formed. Is the air supply pipe 21
Is connected to an air supply source (not shown) via. The opening 20a of the air blow hole 20 is set so as to point to the opening on the sleeve 12 side of the hot water supply passage 13 when the gate closing block 15 is located at the gate closing position P _2. There is.

Further, a shaft 32 is integrally keyed to the boss portion 31 of the frame 1, and the boss portion 31 itself is rotatably supported by a support member 34 via a bearing 33, while the shaft 32 is rotatably supported. A pulley 35 is fixed to 32. Further, Ji between the the support 34 side is motor 36 is provided, the frame 1 side of the pulley 35 fixed pulley 38 and the output shaft 37 of the motor 36
Chain 39 is wrapped around. Then, by starting the motor 36, the frame 1 can be rotated to an arbitrary position.

In the pressure casting apparatus configured as described above, as shown in FIGS. 2 and 3, the frame 1 is erected so that the hopper 14 is directly above, and then the upper and lower molds 4, 8 are provided. Is clamped, and with the gate closing block 15 positioned at the gate opening position P ₁ , hot water is supplied from the hopper 14 using the ladle 22. At this time, the backup block 17 is retracted so as not to project into the sleeve 12. Then, the molten metal M supplied from the hopper 14
Is temporarily stored in the upper space of the pressure plunger 11, that is, the space C formed by the pressure plunger 11 and the gate closing block 15 from the hot water supply runner part 13 through the gate part 3.

When a predetermined amount of the molten metal M is stored in the molten metal storage space C, the spout block 1 as shown in FIG.
5 is moved down to the gate closing position P ₂ to cut off the communication between the gate 3 and the hot water supply passage 13. In addition, the hot water supply runner portion 13 is coated beforehand with an inner peripheral surface in order to suppress the temperature decrease of the molten metal M passing therethrough as much as possible.

Further, as shown in FIG. 5, the backup block 17 is advanced so as to enter the sleeve 12, and the inclined surface 17a at the tip of the backup block 17 and the inclined surface 15a at the upper surface of the spout closing block 15 are brought into contact with each other. Contact. As a result, the gate closing block 15 is locked at the gate closing position P ₂ while being backed up by the backup block 17.

At this time, the gate closing block 15
Is positioned a few millimeters below the normal gate closing position P _{2 in} advance, and after the backup block 17 advances, the gate closing block 15 is pulled up again so that the inclined surfaces 17a, 15a of both are brought into contact with each other. To
By doing so, it is possible to prevent the advancing force of the backup block 17 from exerting an excessive force on the gate closing block 15.

When the gate closing block 15 is backed up by the backup block 17 as described above, the pressure plunger 11 is moved up by the operation of the pressure cylinder 10 as shown in FIG. As a result, the molten metal M stored in the molten metal storage space C passes through the gate portion 23 and is pressurized and filled in the product portion space 9. Simultaneously with the above pressure filling, the air blow hole 20 of the gate closing block 15
By blowing air from the hot water supply runner part 13 toward the hot water supply runner part 13, the molten metal slag adhering to the inner peripheral surface of the hot water supply runner part 13 is removed.

Here, at the time of the above-mentioned pressure filling, the pressure of the molten metal M applied by the pressure plunger 11 is applied to the gate closing block 15 as it is, but the gate closing block 15 itself is provided by the backup block 17. Since it is backed up, it is possible to sufficiently oppose the above pressing force. Therefore, even if the pressure receiving area of the gate closing block 15 is smaller than the pressure receiving area of the pressure plunger 11, there is no particular problem.

When the molten metal in the product space 9 is solidified, the motor 36 shown in FIG. 2 is started to rotate the frame 1 around the shaft 32 as a rotation center to an arbitrary position, and then the upper and lower molds 4 and 8 are rotated. Is opened, and the product is ejected from the lower mold 8 by an ejector mechanism (not shown). At this time, the gate closing block 15 is slightly projected to the lower mold 8 side in parallel with the mold opening operation, so that the product can be reliably released from the upper mold 4.

[0028]

As described above, according to the present invention, the gate closing block facing the pressure plunger is backed up by another backup block, and the gate closing block or the gate closing mechanism centering on the backup block is provided. By providing the fixed platen side, the following effects can be obtained.

(1) The pressure filling of the molten metal into the product space is
Since the gate closing block is kept in the gate closing position and the pressurizing operation is performed only by the pressure plunger, it is not necessary to adjust the operation balance between the pressure plunger and the gate closing block as in the conventional case.

(2) Since the gate closing block, backup block, sleeve, etc. are attached to the fixed platen side instead of the mold side, the structure of the mold, particularly the upper mold, can be simplified and the space of the product part can be arranged. The degree of freedom of the typical casting method can be secured.

(3) Since the gate closing block is backed up by the backup block, even if the pressure receiving area of the gate closing block is smaller than the pressure receiving area of the pressure plunger, it is possible to sufficiently oppose the molten metal pressure. The gate closing block can be made smaller than the pressure plunger.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of an essential part showing a state immediately before mold opening, which is a view showing an embodiment of the present invention.

FIG. 2 is a diagram showing an embodiment of the present invention and is an explanatory diagram of the configuration of the entire apparatus.

FIG. 3 is an enlarged cross-sectional view of a main part of FIG.

FIG. 4 is an enlarged sectional view of an essential part showing a state in which a gate closing block is lowered from the state of FIG.

5 is an enlarged sectional view of an essential part showing a state where the backup block is advanced from the state of FIG.

FIG. 6 is an explanatory sectional view showing an example of a conventional pressure casting device.

[Explanation of symbols]

2 ... Fixed platen 3 ... Gate part 4 ... Upper mold 7 ... Movable platen 8 ... Lower mold 9 ... Product space 11 ... Pressurized plunger 12 ... Sleeve 13 ... Hot water supply runner part 15 ... Gate block 17 ... Backup block 23 … Gate C… Molten metal storage space M… Molten metal P ₁ … Gate opening position P ₂ … Gate closing position

Claims (1)

[Claims] 1. A molten metal is temporarily stored by supplying hot water from a hot water supply passage to a space formed between an upper gate closing block and a lower pressure plunger, and the hot water supply passage is closed. a melt of the molten metal reservoir space above the product portion space a pressure casting apparatus that is pressure filled, between the lower mold fixed to the upper mold and allowed dynamic platen fixed to the fixed platen And a product part space formed on the upper surface of the upper mold, and the spout is provided in the lower mold so as to be movable up and down, and moves upward after the opening of the spout is closed. A pressure plunger for pressurizing and filling the molten metal in the molten metal storage space into the product space, a vertical sleeve supported by the fixed platen and connected to the opening of the sprue part, and formed on the fixed platen, Above the opening of the sprue part of the sleeve Hot water supply runner part connected to the sleeve at a position, and a sprue opening position which is inserted into the sleeve and allows communication between the opening part of the sprue part and the hot water supply runner part through the sleeve, A gate closing block that slides up and down between a gate closing position that blocks communication between the opening of the gate and the hot water supply passage, and a gate closing block of the fixed platen at the gate closing position. It is provided above and moves forward and backward in the sleeve from a direction orthogonal to the sliding direction of the sprue block, and at the forward position, contacts the upper surface side of the spout block to bring the spout block to the spout closed position. A pressure casting device comprising a restraining backup block.