JPH1034308A - Vertical die casting machine injection equipment - Google Patents

Abstract

(57) [Abstract] (With correction) [Problem] An injection device capable of easily and easily adjusting the relative height position of a plunger tip with respect to an injection sleeve in response to a change in a molten metal amount due to a mold change or the like. I will provide a. SOLUTION: This is an injection device for a die casting machine, in which a plunger tip fixedly mounted on an upper end portion of the plunger via a piston rod and a coupling is slidably fitted in an axial direction of the injection sleeve. After the hot water is supplied to the injection sleeve, the injection sleeve, the block, and the plunger tip are moved upward integrally together with the injection sleeve, and the upper end of the injection sleeve is docked to the lower part of the mold to thereby form the injection sleeve. In an injection apparatus of a die casting machine for injecting and filling a molten metal into a mold cavity by raising the plunger tip in an injection sleeve, a flange-like flange is provided outside an intermediate portion of the injection plunger, and an outer periphery of the injection plunger is provided. Between the flange and the coupling, both ends of which can abut the flange and the coupling, respectively. An elevating pipe that can move forward and backward in the direction is provided, and the block is provided with gripping means for gripping the elevating pipe at an arbitrary height on the outer periphery of the elevating pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection device for a vertical die casting machine, and more particularly, to an injection plunger that slides in an injection sleeve so that the amount of molten metal poured into the injection sleeve can be arbitrarily changed. The present invention relates to an injection device for a vertical die casting machine in which the relative position of a plunger tip connected to the top of a vertical die casting machine can be freely changed.

[0002]

2. Description of the Related Art In a die casting machine, whether or not a molten metal in a high temperature state can be cast (injection-filled) into a mold cavity while minimizing a decrease in temperature is extremely important for the quality of a molded product. Has an influence. The reason for this is that the viscosity of the molten metal increases as the temperature of the molten metal decreases, which causes poor running of the molten metal in the mold cavity. Therefore,
Since it is necessary to cast the molten metal into the mold cavity in the shortest possible time, a high injection speed is required for the die casting machine. However, as the injection speed is increased, the molten metal surface in the injection sleeve or the mold cavity is scattered and scattered, so that the gas of the atmosphere is involved and bubbles are included in the molten metal during the molding process. .
Therefore, in the molded product, voids other than the molten metal in the molten metal, that is, cavities are formed, and the strength, pressure resistance,
It often became a problem in terms of drip-proof (non-leakage).
As is clear from the above description, in order to obtain a good die-cast molded product, at a low speed without disturbing the molten metal surface, and
It turns out that it is important to minimize the time required for the molten metal in the injection sleeve to move into the mold cavity and cast the molten metal.

On the other hand, FIGS. 7 and 8 show an injection device 1 having a conventional structure.
The injection sleeve 4 is fitted to the upper end of the cylindrical block 6, and is vertically erected and integrated, and a plurality of cylinders 15 pierced at the lower end of the block 6. A ram 16 erected at the upper end of the injection cylinder 8 is slidably fitted in the upper and lower scents.
Supply the working oil via the injection cylinder 8
, The block 6 and the injection sleeve 4 are moved forward and backward. The piston rod 13 of the injection cylinder 8 is joined to an injection plunger (also called a plunger) 7 by a coupling 12, and the plunger tip 5 at the tip of the injection plunger 7 moves up and down in the injection sleeve 4. Horizontal rotary shafts 9 are provided on both side surfaces of the upper end of the injection cylinder 8, and the injection cylinder 8 is tilted integrally with the block 6 and the injection sleeve 4 around the rotary shaft 9 by rotation driving means (not shown). You. FIG.
8 shows the tilted state. After the molten metal 10 is injected into the tilted injection sleeve 4 by the ladle 11, the tilt is returned (returned from the tilted state to the original upright state) as shown in FIG. Then, when the hydraulic oil of the injection cylinder 8 is turned off-load (no load), the hydraulic oil is supplied from the port c into the cylinder 15 through the hydraulic oil injection hole of the ram 16, and the block 6 is raised. The upper surface of the flange-shaped engaging portion 14 horizontally projecting inward from the lower end of the block 6 pushes up the lower end surface of the coupling 12, so that the injection sleeve 4 and the plunger tip 5 are integrated with the block 6.
Rises, and the tip of the injection sleeve is docked in the lower mounting hole of the fixed mold 2.

[0004]

However, the injection apparatus 100 of the vertical die casting machine having such a conventional structure as described above.
Then, the amount of molten metal to be injected into the injection sleeve is 10
The height of the plunger tip is set so that the liquid level of the molten metal is substantially near the upper end surface of the injection sleeve, and the length of the injection plunger is designed. However, in order to change the shape of the molded product due to production reasons, if the two dies 1 and 2 are changed and the amount of one molten injection filling is accordingly reduced, the molten metal 10 is not shown in FIGS. It becomes the molten metal 10A shown in 8,
The drop between the liquid surface of the molten metal and the upper end surface of the injection sleeve becomes large.
In order to shorten the moving time of the molten metal, the moving distance of the molten metal from the injection sleeve to the mold cavity may be minimized.However, depending on the shape of the molded product, the amount of molten metal corresponding to the volume is different. In the conventional injection device having a fixed injection plunger length, the relative position between the injection sleeve and the plunger tip is set to a single value.
In response to the change in the amount of molten metal, the liquid level after being injected into the injection sleeve cannot be close to the upper end surface of the injection sleeve. For example, as shown in FIG. Each time the injection filling is performed, a useless moving distance occurs. In addition, since the head is large, the surrounding air is easily entrained when the molten metal is injected, which causes deterioration in the quality of the molded product. As a countermeasure against this, in order to change the relative position of the plunger tip with respect to the injection sleeve in response to a single change in the amount of molten metal, the injection plunger must be replaced with a different length plunger or the amount of molten metal must be changed. There is a method in which a plurality of sets of injection plungers having different diameters (inner diameters) and plunger tips to be fitted thereto are easily prepared in advance according to the conditions, and each time the exchange is changed to an optimum one corresponding to the amount of molten metal. Since the cylinders need to be separated, the operation is very complicated, resulting in an increase in operation downtime, and the latter has a problem in that the equipment cost increases.

[0005]

In order to solve the above-mentioned problems, according to the present invention, a lower end portion is fitted to an upper end portion of a cylindrical block having a through hole in a direction perpendicular to an axis at an intermediate portion. In a vertically mounted injection sleeve which is supported and connected via a coupling to a piston rod of an injection cylinder which is disposed below the block so as to be able to move forward and backward with respect to the block and is tiltable about a horizontal axis. An injection device of a die-casting machine in which a plunger chip fixed to an upper end portion of the plunger is slidably fitted in an axial direction of the injection sleeve through a set injection plunger. After the hot water is supplied, the injection sleeve, the block, and the plunger tip are moved upward integrally together with the injection sleeve, and the upper end of the injection sleeve is docked to the lower part of the mold to cool the injection sleeve. In an injection device of a die casting machine for injecting and filling a molten metal into a mold cavity by raising the plunger tip in an ejection sleeve, a flange-like flange is provided outside an intermediate portion of the injection plunger, and an outer periphery of the injection plunger is provided. Between the flange and the coupling, a lift pipe whose both ends can abut the flange and the coupling, and which can move up and down in the vertical direction, is provided on the outer periphery of the lift pipe. The block is provided with a holding means for holding the tube at an arbitrary height.

[0006] In the second invention, the gripping means of the elevating pipe is an electromagnetic brake or an electromagnetic clutch. Further, in the third invention, the gripping means of the lifting pipe is a mechanical brake including a pair of left and right brake shoes which horizontally move back and forth via a link mechanism to a piston rod of a hydraulic cylinder. Further, in the fourth invention, the lifting pipe gripping means is a mechanical brake that applies tension to a steel band wound around the lifting pipe outer periphery via a lever lever connected to the piston rod of the fluid pressure cylinder. .

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a vertically extending injection sleeve is supported by supporting a lower end portion of a cylindrical block having a through hole in a direction perpendicular to the axis at an intermediate portion, and having a lower end fitted thereto. An injection plunger is provided at the lower end of the block so as to be able to move forward and backward with respect to the block, and is tiltable about a horizontal axis. An injection device of a die-casting machine in which a fixed plunger tip is slidably fitted in an axial direction of the injection sleeve. After supplying hot water to the tilted injection sleeve, the injection device returns to tilt and returns to the injection sleeve. And the block and the plunger tip are moved upward together and the upper end of the injection sleeve is docked to the lower part of the mold to raise the plunger tip in the injection sleeve. In the injection device of a die casting machine for injecting and filling a molten metal into a mold cavity, a flange-like flange is provided outside an intermediate portion of the injection plunger, and the flange of the outer periphery of the injection plunger and the coupling are provided. Between the two ends, an elevating tube that can abut the flange and the coupling and that can move up and down in the vertical direction is disposed, and the elevating tube is gripped at an arbitrary height on the outer periphery of the elevating tube. Since the holding means is provided in the block, when the mold changes and the amount of molten metal changes, the height position of the elevating tube previously held by the holding means is changed to an appropriate height position. . In other words, when the amount of molten metal becomes smaller, the lift pipe is gripped at a lower position than before, and the upper end of the lift pipe and the flange contact portion of the injection sleeve are corrected and changed to a higher position than before. The height of the plunger tip with respect to the injection sleeve is increased.

In the second to fourth aspects of the present invention, the lifting pipe is provided with an electromagnetic brake (or electromagnetic clutch),
Since the mechanical brake by the link mechanism and the mechanical brake by the steel band are used for gripping, the block and the lifting pipe can be easily and detachably attached to the lifting pipe at an arbitrary height position.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 6 relate to an embodiment of the present invention, FIG. 1 is an overall longitudinal sectional view of an injection device, and FIG.
FIG. 3 is a cross-sectional plan view taken along line BB of FIG. 1, FIG. 4 is a cross-sectional plan view of gripping means (second embodiment) showing another embodiment, and FIG. 6 is a cross-sectional plan view of a gripping means (third embodiment) showing another embodiment, as viewed from the line C-C. The injection device 100A according to the present invention is shown in FIGS.
As shown in the figure, the lower end of the injection sleeve 4 is fitted to the upper end of the vertical cylindrical block 6 which is disposed immediately below the movable mold 1 and the fixed mold 2, and stands up. Immediately below, an injection cylinder 8 is disposed, and a ram protruding upward from the upper end surface of the injection cylinder 8 is provided in two vertical ram cylinders 15 each formed of a vertical cylindrical cavity provided in a lower portion of the block 6. The block 6 is fitted to the ram 16, and the hydraulic oil is guided through a hydraulic oil supply passage 16 a formed in the ram 16. The injection cylinder 8 and the block 6 can be integrally tilted by a tilting means (not shown) by supporting a horizontal rotating shaft 9 attached to both ends of the shaft 8 with a bearing 9a for bearing.

On the other hand, in the cavity inside the block 6, the upper end of the piston rod 13 of the injection cylinder 8 is connected to the lower end of the injection plunger 7 via the coupling 12.
In the present invention, a flange-like flange 7f is fixedly provided at an intermediate portion of the injection plunger 7, and an elevating tube 20 having a flange at an upper end is provided between the flange 7f of the injection plunger 7 and the coupling 12 to form the injection plunger 7. It is fitted on the outside as a double pipe, and is arranged to be able to move up and down in the vertical direction. On the other hand, a holding means 30 for holding the outer periphery of the elevating tube 20 at an appropriate height within the vertical movement range of the elevating tube 20 is fixedly provided inside the block 6. In the first embodiment shown in FIGS. 1 to 3, the gripping means 30 is an electromagnetic brake 30A (or an electromagnetic clutch).
After setting the elevating tube 20 at an arbitrary height, the lifting tube 20 can be gripped. The electromagnetic brake 30A or the electromagnetic clutch 30A is for holding the lifting pipe at a certain position by an excited electromagnetic force and releasing its grip by demagnetization, and is an electromagnetic friction type in which the lifting pipe outer peripheral surface is pressurized by an electromagnetic force. Or an electromagnetic tooth type in which teeth provided on the driving side and the driven side are engaged with each other, and a hysteresis clutch / brake and an induction clutch which transmit torque in a non-contact manner instead of a frictional force are used. .

The operation of the injection device 100A of the vertical die casting machine according to the present invention will be described. From the state in which the injection sleeve 4, the block 6, and the injection cylinder 8 are upright as shown in FIG. 1, the tilting means (not shown) is tilted about the rotary shaft 9 by about 10 to 20 degrees and stopped. Then, the molten metal is poured into the injection sleeve 4 by the ladle 11. After this work is completed, the work returns to the original upright state (the state shown in FIG. 1) after returning to the tilting state. The height position of the elevating pipe 20 is adjusted in advance so that the liquid level of the molten metal supplied into the injection sleeve 4 is close to the upper end surface of the injection sleeve 4, for example, as shown in FIG. Keep it. Next, the rod side chamber e of the injection cylinder 8
In addition, the hydraulic oil pressure in the head side chamber d is set to an off-load (no load) state, and the hydraulic oil is slowly guided to the ram cylinder 15 via the port c and the hydraulic oil passage 16a of the ram 16, so that the block 6 is quietly moved. To raise. At this time, since the block 6 is gripping the lifting pipe via the gripping means 30 (specifically, the electromagnetic brake 30A or the like), the lifting pipe 20 is also raised together with the block 6, and the flange at the upper end of the lifting pipe 20 is provided. As a result, the plunger tip 5 in the injection sleeve 4 rises integrally with the injection sleeve 4 without changing the relative position with respect to the injection sleeve 4, so that the molten metal in the injection sleeve 4 Also rises together at the same time. In this manner, the upper end of the injection sleeve 4 is brought into close contact with the mounting portion formed on the lower surface of the fixed mold 2 to complete the docking operation.
Thereafter, the injection cylinder 8 is operated to inject and fill the molten metal in the injection sleeve 4 into the mold cavity 3.

By the way, for some reason in production,
If the amount of molten metal changes greatly after the mold is replaced, the relative position between the injection sleeve 4 and the plunger tip 5 may overflow at the time of injection of the injection sleeve (when the amount of molten metal increases), or the injection may occur. The liquid level of the molten metal after the injection of the sleeve is considerably lower than the upper end face of the injection sleeve (when the amount of the molten metal is reduced), and the above-described problem occurs, so that the plunger tip height needs to be adjusted. . Therefore, in order to adjust the height position of the plunger tip 5, first, the injection cylinder 8 is operated to slowly move the piston until the upper surface of the coupling 12 gently contacts the lower end of the elevating tube 20 gripped by the gripping means 30. Raise the rod 13,
After the contact, the gripping force of the gripping means 30 is released (in the case of the electromagnetic brake 30A, demagnetize), and then the piston rod 13 is moved up and down by a required height to adjust the height position of the elevating tube 20. . After the positioning is completed, the lifting pipe 20 is gripped by the gripping means 30 again. After being adjusted to the predetermined height in this way, the flange 20a at the upper end of the elevating pipe 20 and the flange 7f of the injection plunger 7 abut, and the height position of the plunger tip 5 is increased (or Lower), the molten metal 10A poured into the injection sleeve 4
Is near the upper end surface of the injection sleeve 4 (or away from the upper end surface). As described above, after the docking operation, the liquid is rapidly introduced into the mold cavity 3 without causing unnecessary transfer in the injection sleeve. Injection filling. In the present invention, since the height of the elevating pipe 20 is adjusted by operating the injection cylinder 8 according to the above-described procedure, the advance and retreat of the piston rod 13 of the injection cylinder 8 is performed to facilitate the height adjustment. It is desirable to have a position sensor for measuring the moving distance. As these position sensors, for example, a magnetic scale, a linear encoder, an ultrasonic displacement sensor or a laser beam displacement sensor can be adopted.

FIGS. 4 and 5 show an injection device 100B in which the gripping means 30 shows another embodiment (second embodiment), and employs a mechanical brake 30B. Explaining only the points different from the injection device 100A of FIGS. 1 to 3, the mechanical brake 30B is a hydraulic cylinder (which may be a hydraulic cylinder or an air cylinder) 40 that is horizontally installed through the block 6 by a link mechanism 31. Lift pipe 2
0, a pair of left and right brake shoes 32, 3 facing each other
2 can be freely moved toward and away from the lifting pipe 20 to
The link mechanism 31 pivots links 31a and 31d, which are respectively pin-joined to two mounting seats 6a and 6a inside the block 6, via links 31b and 31c. Link 31a, Link 31
The structure is such that the brake shoes 32, 32 attached to the intermediate portion of d move forward and backward. In this case, the method of adjusting the relative height position of the plunger tip 5 with respect to the injection sleeve 4 is also performed in the same manner as in the injection device 100A shown in FIGS.

FIG. 6 shows another embodiment (third embodiment) of the gripping means 30, which is provided with a mechanical brake 30C using a steel band. In the injection device 100C provided with the mechanical brake 30C, an intermediate part of a lever (lever) 34 in which both ends of a steel band band 35 wound around the elevating pipe 20 are fastened to one end is provided inside the block 6. Seat 6
The hydraulic cylinder (which may be a hydraulic cylinder or an air cylinder) 40 is pin-joined to the tip of the piston rod with the other end passing through the block 6. The lifting band 20 is gripped by applying tension to the band band 35. Adjustment of the relative height position of the plunger tip 5 with respect to the injection sleeve 4 in the case of the injection device 100C is performed in the same manner as in the injection device 100A of FIGS. 1 to 3 and the injection device 100B of FIGS.

The injection device 100 constructed as described above
B and the operation of the injection device 100C are the same as those of the injection device 10 described above.
Similarly to the operation at 0A, after pouring into the injection sleeve, the upper surface of the flange 20a is brought into contact with the lower surface of the flange 7f to integrally move the block 6, the elevating tube 20, and the plunger tip 5 to inject. When the upper end of the sleeve 4 is docked to the fixed mold cavity 2 and then the injection cylinder 8 is driven forward, the injection plunger 7 moves freely upward in the elevating tube 20 without any restraint, and the mold cavity is moved. 3 is filled with molten metal by injection.

As described above, in the present invention,
Since the height position of the plunger tip 5 with respect to the injection sleeve 4 can be arbitrarily and easily adjusted, the required amount of molten metal can be adjusted in the mold cavity in the shortest time without performing unnecessary movement. Since it is possible to perform injection filling, the productivity is improved, and there is no casting defect, and the quality of the molded product is remarkably improved. In addition, there is no need for a separate power unit for vertically moving the lifting pipe when adjusting the height of the lifting pipe 20, and the existing power (injection cylinder) is used.

[0017]

As described above, in the injection device of the vertical die casting machine according to the present invention, the height position of the plunger tip can be adjusted appropriately in accordance with the amount of hot water by an extremely simple and easy operation. Since the liquid level of the molten metal in the sleeve can be held near the upper end surface of the injection sleeve, there is no useless movement distance, so that cooling and solidification during filling of the molten metal can be prevented, and an optimal injection state can be secured. In addition, once the height position of the plunger tip with respect to the injection sleeve is adjusted, there is no need to change it if the amount of molten metal does not change, so that the driving operation is easy. Therefore, high-quality molding excellent in strength, pressure resistance and liquid resistance can be prevented as much as possible, while preventing poor running of the metal in the mold cavity due to a decrease in the temperature of the hot water supply and an increase in the viscosity of the molten metal. The product can be obtained easily and reliably.

[Brief description of the drawings]

FIG. 1 is an overall vertical sectional view of an injection device according to an embodiment of the present invention.

FIG. 2 is an overall vertical sectional view taken along line AA of FIG.

FIG. 3 is a sectional plan view taken along line BB of FIG. 1;

FIG. 4 is a cross-sectional plan view of a gripper (second embodiment) according to another embodiment of the present invention.

FIG. 5 is a vertical sectional view of an essential part taken along line CC of FIG. 4;

FIG. 6 is a sectional plan view of a gripping device (third embodiment) according to another embodiment of the present invention.

FIG. 7 is an overall vertical sectional view of a conventional injection device (when tilted).

FIG. 8 is an overall vertical sectional view of a conventional injection device (when standing upright).

[Explanation of symbols]

Reference Signs List 1 movable mold 2 fixed mold 3 mold cavity 4 injection sleeve 5 plunger tip 6 block 6a through hole 6b mounting seat 7 injection plunger 7f flange 8 injection cylinder 9 rotating shaft 9a bearing 10 molten metal 10A molten metal 11 ladle 12 coupling 13 Piston rod 15 Ram cylinder 16 Ram 16a Hydraulic oil supply passage 20 Lifting pipe 20a Flange 30 Gripping means 30A Electromagnetic brake (or electromagnetic clutch) 30B Mechanical brake 30C Mechanical brake 30a Brake shoe 31 Link mechanism 31a, 31b, 31c, 31d Link 32 Brake shoe 33 Pin joint 34 Lever 35 Steel band 40 Fluid pressure cylinder 40a Piston rod 40b Fork end 100 Injection device (conventional structure) 100A, 100B, 100 C Injection device (structure of the present invention) a, b, c Port d Head side chamber e Rod side chamber

Claims (4)

[Claims] 1. A vertically extending injection sleeve having a lower end fitted and supported on an upper end of a cylindrical block having a through hole in a direction perpendicular to the axis of an intermediate portion, and a lower end of the block. A plunger tip fixed to the upper end of the plunger via an injection plunger connected via a coupling to a piston rod of an injection cylinder which is arranged to be able to move forward and backward with respect to the block and is tiltable about a horizontal axis. An injection device of a die casting machine fitted slidably in the axial direction of the injection sleeve, and after supplying hot water to the tilted injection sleeve, tilted and returned.
The injection sleeve, the block, and the plunger tip are integrally moved upward together, the upper end of the injection sleeve is docked to the lower part of the mold, and the plunger tip in the injection sleeve is raised to move the inside of the mold cavity. In an injection device of a die casting machine that injects and fills a molten metal, a flange-shaped flange is provided outside an intermediate portion of the injection plunger, and both ends are provided between the flange and the coupling on the outer periphery of the injection plunger. An elevating pipe capable of abutting on the flange and the coupling and movable up and down in the vertical direction is provided, and a gripping means for gripping the elevating pipe at an arbitrary height is provided on an outer periphery of the elevating pipe on the block. An injection device for a vertical die casting machine, comprising: 2. The injection device for a vertical die casting machine according to claim 1, wherein the holding means of the lifting pipe is an electromagnetic brake or an electromagnetic clutch. 3. The vertical die-casting machine according to claim 1, wherein the gripping means of the elevating pipe is a mechanical brake comprising a pair of left and right brake shoes which horizontally move back and forth to a piston rod of a fluid pressure cylinder via a link mechanism. Injection device. 4. A mechanical brake for applying tension to a steel band wound around an outer periphery of a hoisting pipe via a lever lever connected to a piston rod of a fluid pressure cylinder. An injection device for the vertical die casting machine according to 1.