JPH0629759U - Die casting mold equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a simple and inexpensive die casting mold device in which a core pin can be inserted and arranged in a cavity at the same time as mold clamping. [Structure] A cavity 3 is formed on a mating surface of a fixed mold 1 and a movable mold 2, and core pins 4 ₁ and 4 ₂ which are inserted into the cavity 3 and a tip of which abuts on one movable mold 2, and the core pin 4 Pistons 10 ₁ , 10 abutting on the base ends of ₁ , 4 _2
2 and the other fixed mold 1 are slidably fitted to partition the liquid chambers 11 ₁ and 11 ₂ on the side opposite to the core pins 4 ₁ and 4 ₂ sides of the pistons 10 ₁ and 10 _2. Liquid chamber 11 ₁ , 11 ₂
The pressure liquid supply device 12 was connected to the via a relief valve 14.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a die device used for producing a product with holes by a die casting method.

[0002]

[Prior art]

 Conventionally, as a die casting die apparatus of this type, there is one described in Japanese Patent Application Laid-Open No. 2-121761. In this mold device, as shown in FIG. 2, a cavity 22 is formed on the mating surface of the fixed mold 20 and the movable mold 21, and the core pin 23 that is inserted into the cavity 22 and abuts against the movable mold 21 is fixed. On the other hand, the fixed die 20 is provided with a drive device 24 for slidingly fitting the core pin 23 in and out of the cavity 22. The driving device 24 has a cylinder 26 provided in a recess 20a formed on the side opposite to the movable mold 21 side of the fixed mold 20 via a support base 25, and a rod 26a of the cylinder 26 is provided with a base of the core pin 23. While connecting the plate 27 holding the ends, a guide pin 29 is installed between the back plate 28 provided in the opening of the recess 20a and the bottom of the recess 20a, and the plate 27 is slid on the guide pin 29. It is fitted so that it can move freely. When the mold is clamped by the cylinder 26, the core pin 23 is projected from the fixed mold 20 into the cavity 22 and held in contact with the movable mold 21, and after the molten metal is injected and solidified in such a state, the core pin 23 is opened before the mold is opened. 23 is retractable from the cavity 22 into the fixed mold 20.

[0003]

[Problems to be solved by the device]

 However, in the conventional die-casting mold apparatus described above, in addition to the drive unit 24 including the cylinder 26, the plate 27, the guide pin 29, etc., the core pin 23 is inserted into and removed from the fixed mold 20 by the drive unit 24. Since it is necessary to accommodate a detection mechanism (not shown) for detecting, the mold becomes large and complicated, and the number of components increases. Moreover, since there are many moving parts, it takes time to adjust and assemble. Further, in order to move the core pin 23 in and out according to the molding cycle, not only an electric controller or the like for controlling the cylinder 26 is required, but also the cycle time increases and the molding efficiency decreases.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a simple and inexpensive die casting die device in which the core pin can be inserted and arranged in the cavity at the same time as the die clamping. .

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the die casting mold apparatus of the present invention forms a cavity on a mating surface of a fixed die and a movable die, and is inserted into the cavity to insert one of the fixed die and the movable die. A core pin, the tip of which abuts on the mold, and a piston, which abuts on the base end of the core pin, are slidably fitted to the other mold to define a liquid chamber on the side opposite to the core pin side of the piston. A pressure liquid supply device is connected to the liquid chamber via a relief valve.

[0006]

[Action]

 According to the above configuration, the core pin is pushed by one of the fixed mold and the movable mold during mold clamping and enters the other mold. Therefore, simultaneously with the mold clamping, the cavity into which the core pin is inserted is formed on the mating surface of the fixed mold and the movable mold.

The piston is retracted by the core pin and the volume of the liquid chamber is reduced, so that the fluid pressure in the liquid chamber rises to the set pressure of the relief valve. Therefore, the contact force set by the relief valve is urged to the core pin via the piston, so that the tip of the core pin and the one die contact each other without a gap.

[0008]

【Example】

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

FIG. 1 is a sectional view showing a die casting mold device. In this figure, 1 is a fixed type, 2 is a movable type, 3 is a cavity, 4 ₁ and 4 ₂ are core pins.

The stationary die 1 is composed of a die plate 1A and a die body 1B, and the die body 1B is mounted on a stationary platen (not shown) via the die plate 1A. The movable die 2 is composed of a die plate 2A and a die body 2B, and the die body 2B is attached to a movable platen (not shown) via the die plate 2A. Then, the movable platen is moved forward and backward with respect to the fixed platen by a mold clamping device (not shown) so that the fixed mold 1 and the movable mold 2 can be opened and closed. A cavity 3 is formed on the surface.

The die body 1B on the stationary die 1 side is provided with two pin holes 5 in which a large diameter portion 5b is continuously provided at one end of a small diameter portion 5a and a stopper surface 5c is formed at the inner surface continuously provided portion. The opening of the large diameter portion 5b of the pin hole 5 is covered with a die plate 1A.

The shaft portion 4a of the core pin 4 ₁ is slidably fitted in the small diameter portion 5a of the one pin hole 5, and the head portion 4b provided at the base end of the shaft portion 4a has the pin hole 5a. It is housed in the large-diameter portion 5b and is movable by C in the axial direction of the shaft portion 4a. Further, the small diameter portion 5a of the other pin hole 5 the shaft portion 4a of the core pin 4 ₂ is slidably fitted in the head 4b provided on the proximal end of the shaft portion 4 a of the pin holes 5 It is housed in the large-diameter portion 5b and is movable by C in the axial direction of the shaft portion 4a. Reference numeral 6 denotes a core pin projecting from a portion of the die body 2B on the movable die 2 side facing the core pin 4 ₂ .

In the die plate 1A, a large diameter portion 7b is continuously provided at one end of the small diameter portion 7a, and two pin holes 7 having a stopper surface 7c are formed at the inner continuous portions thereof. The opening of the large diameter portion 7b of the pin hole 7 is sealed and closed by a screw plug 8.

[0014] which the piston rod 9 ₁ in the small-diameter portion 7a of one of the pin holes 7 slidably fitted a piston 10 ₁ provided on the piston rod 9 ₁ of the base end large diameter of the pin hole 7 It is housed in the part 7b. Further, the small-diameter portion 7a of the other pin hole 7 Pisutonro head 9 ₂ is slidably fitted in the piston 10 ₂ provided at the proximal end of the piston rod 9 ₂ diameter of the pin hole 7 It is housed in the portion 7b.

A liquid chamber 11 ₁ is defined on the opposite side of the piston 10 _{1 from} the core pin 4 ₁ side (between the piston 10 ₁ and the screw plug 8), and the opposite side of the piston 10 _{2 from} the core pin 4 ₂ side ( A liquid chamber 11 ₂ is defined between the piston 10 ₂ and the screw plug 8 and the discharge side of the hydraulic pump 12 which constitutes the pressurized liquid supply device is connected to the liquid chambers 11 ₁ and 11 _2. The valve 15 is connected to the flow path 15 via a counter balance valve composed of a relief valve 14 and a relief valve 14.

The piston rod 9 ₁ is urged by the hydraulic pressure in the liquid chamber 11 ₁ via the piston 10 ₁ and presses the head portion 4 b of the core pin 4 ₁ , which causes the tip portion of the shaft portion 4 a to move. The protrusions are C longer than the facing distance between the die surfaces 1a and 2a of the die bodies 1B and 2B when the die is clamped. Further, the piston rod 9 ₂ is urged by the fluid pressure in the piston 10 ₂ the liquid chamber 1 1 in ₂ through pressing the core pin 4 ₂ of the head 4b, thereby at tip clamping shank 4a C is projected longer than the facing distance between the die surface 1a of the die body 1B and the tip end surface of the core pin 6.

In the above configuration, the mold clamping is performed by advancing the movable mold 2 with respect to the fixed mold 1. At this time, core pin 4₁Four₂Is pushed by the die body 2B into the pin hole 5 of the die body 1B, and the core pin 4₁Four₂The distance between the head portion 4b, the pin hole 5, and the stopper surface 5c is C. Also, the piston 10₁10,₂Is the core pin 4 ₁ Four₂Pushed by the piston 10₁10,₂And the stopper surface 7c of the pin hole 7 is C + α.

With this, simultaneously with the mold clamping, the cavity 3 into which the core pins 4 ₁ and 4 ₂ are inserted is formed on the mating surface between the fixed mold 1 and the movable mold 2, and the volumes of the liquid chambers 11 ₁ and 11 ₂ are increased. Is reduced, and the liquid pressure in the liquid chambers 11 ₁ and 11 ₂ rises. When the liquid pressure reaches the set pressure of - relief valve 14, the relief valve 14 is opened, hydraulic fluid in the liquid chamber 11 _1, 1 1 in ₂ is returned to the tank 16. Therefore, the set pressure of the relief valve 14 is urged to the core pins 4 ₁ , 4 ₂ via the pistons 10 ₁ , 10 ₂ , so that the liquid pressure in the liquid chambers 11 ₁ , 11 ₂ and the mold clamping pressure cause core pin 4 to ₁ of the tip mold surface 2a of the die body 2B, the tip of the core pin 4 ₂ abuts without clearance each of the distal end surface of the core pin 6.

The product is taken out by solidifying the molten metal, retracting the movable mold 2 to open the mold, and then releasing the product attached to the fixed mold ₁ and removing it from the core pins 4 ₁ and 4 _2. .

[0020] The above type opening eliminates the pushing of the core pin 4 _1, 4 _2, to expand the volume of the liquid chamber 11 _1, 1 1 _2, the fluid pressure of the liquid chamber 11 _1, 11 in ₂ decreases, The check valve 13 is opened, and the hydraulic fluid is supplied from the hydraulic pump 12.

[0021]

[Effect of device]

 As described above, the present invention provides a core pin having a cavity formed on a mating surface of a fixed mold and a movable mold, the tip of which is inserted into the cavity and whose tip abuts on one of the fixed mold and the movable mold, and a base of the core pin. A piston that abuts on the end is slidably fitted to the other mold to define a liquid chamber on the side opposite to the core pin side of the piston, and a liquid pressure chamber is provided in the liquid chamber via a relief valve. Since the supply device is connected, by supplying hydraulic pressure into the liquid chamber by the pressurized liquid supply device, the tip of the core pin is pressed against the one mold without a gap by the liquid pressure in the liquid chamber set by the relief valve and the mold clamping pressure. It can be contacted at the same time as the mold clamping. Therefore, it is not necessary to insert the core pins into the cavity one by one during mold clamping according to the molding cycle, resulting in good molding efficiency, and the molten metal injected into the cavity between the tip of the core pin and the one mold. Since it is possible to reliably prevent the intrusion of burrs and reduce the deburring work, the productivity can be improved as compared with the conventional method.

Further, the liquid chamber is divided into the other mold through the piston, and the pressure liquid supply device is connected to the liquid chamber through the relief valve. Therefore, the mold is simple with few moving parts. Since it can be made small, the manufacturing cost of the mold can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a die casting die apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a die casting mold device that is a conventional example.

[Explanation of symbols]

1 Fixed type (other type) 2 Movable type (one type) 3 Cavity 4 ₁ , 4 ₂ Core pin 10 ₁ , 10 ₂ Piston 11 ₁ , 11 ₂ Liquid chamber 12 Liquid pressure pump (pressure liquid supply device) 14 Relief valve

Claims (1)

[Scope of utility model registration request] 1. A core pin having a cavity formed on a mating surface between a fixed die and a movable die, the tip of which is inserted into the cavity and whose tip abuts on one of the fixed die and the movable die, and a base end of the core pin. A piston that is in contact with the other mold is slidably fitted to the other mold to define a liquid chamber on the side opposite to the core pin side of the piston, and a pressure liquid supply device is provided in the liquid chamber via a relief valve. A die casting mold device characterized by being connected.