JP2007167897A5

JP2007167897A5 -

Info

Publication number: JP2007167897A5
Application number: JP2005368922A
Authority: JP
Filing date: 2005-12-22
Publication date: 2009-02-05
Anticipated expiration: 2025-12-22

Claims

A fixed die plate for holding a fixed mold;
A movable die plate that holds a movable mold and is movable in a mold opening / closing direction with respect to the fixed die plate;
A coupled portion for coupling to either the fixed die plate or the movable die plate, and a piston for generating a mold clamping force housed in the other of the fixed die plate or the movable die plate; A tie bar with
A coupling portion provided on the one of the fixed die plate or the movable die plate, and coupled or releasable to the coupled portion of the tie bar;
A mold clamping cylinder provided on the other of the fixed die plate or the movable die plate and containing the piston;
A hydraulic pressure source for supplying hydraulic fluid of a predetermined pressure to the mold clamping cylinder;
A tank for storing the hydraulic fluid discharged from the mold clamping cylinder;
A liquid flow path circuit for controlling the flow of hydraulic fluid between the hydraulic pressure source , the tank and the clamping cylinder;
With
The mold clamping cylinder is
A large-diameter cylinder chamber;
A small-diameter cylinder chamber that communicates with the opposite side of the large-diameter cylinder chamber on the side opposite to the die plate, and has a smaller diameter than the large-diameter cylinder chamber;
Have
The piston is
The large diameter cylinder chamber is slidable in the large diameter cylinder chamber and divides the large diameter cylinder chamber into a first cylinder chamber opposite to the small diameter cylinder chamber and a second cylinder chamber on the small diameter cylinder chamber side. A piston part;
A small-diameter piston portion projecting from the end surface of the large-diameter piston portion on the small-diameter cylinder chamber side, and capable of sliding on the small-diameter cylinder chamber;
Have
The tie bar is
A first rod portion that protrudes from an end surface of the large-diameter piston portion on the die plate facing surface side, has a smaller diameter than the small-diameter piston portion, and closes an opening opening on the die plate facing surface side of the first cylinder chamber. When,
A second rod for closing the opening which is open on the side opposite to the projecting from an end face opposite to the dialog plate surface facing the small-diameter piston portion, the die plate surface facing the small-diameter cylinder chamber,
To have a mold clamping device.

The liquid channel circuit is
The first cylinder chamber and the second cylinder chamber can be connected or disconnected,
The supply destination of the hydraulic fluid from the hydraulic pressure source is selected as one of the first cylinder chamber and the small diameter cylinder chamber, and the discharge source of the hydraulic fluid to the tank is selected as the other of the first cylinder chamber and the small diameter cylinder chamber Allocatable,
The discharge of the hydraulic fluid from the second cylinder chamber to the tank can be allowed or prohibited,
Configured to
The mold clamping apparatus according to claim 1.

When the front SL coupled parts and the coupling portion is not bound, and connecting the second cylinder chamber and the first cylinder chamber, prohibits the discharge of the working fluid to the tank from the second cylinder chamber and in state, selectively supplying hydraulic fluid to move the tie bar the in and the coupling portion and the coupling portion can bind positioned in the first cylinder chamber or the small-diameter cylinder chamber, wherein the coupled parts And when the coupling portion is coupled, the first cylinder chamber and the second cylinder chamber are shut off, and the hydraulic fluid is allowed to be discharged from the second cylinder chamber to the tank. 3. The mold clamping apparatus according to claim 2 , further comprising first control means for controlling the liquid flow path circuit so as to perform mold clamping by supplying hydraulic fluid to the first cylinder chamber.

When the front SL coupled parts and the coupling portion are attached, cut off and the second cylinder chamber and the first cylinder chamber, allows the discharge of the working fluid to the tank from the second cylinder chamber In this state, the hydraulic fluid is supplied to the first cylinder chamber to perform mold clamping, and then the first cylinder chamber and the second cylinder chamber are connected to operate the tank from the second cylinder chamber to the tank. while prohibiting the discharge of liquid, according to claim 2 having a second control means for controlling the liquid flow path circuit so as to move the movable die plate by supplying hydraulic fluid to the small-diameter cylinder chamber die opening direction Or the mold clamping apparatus according to 3 .

A fixed die plate for holding a fixed mold;
A movable die plate that holds a movable mold and is movable in a mold opening / closing direction with respect to the fixed die plate;
A piston that generates a clamping force for clamping the stationary mold and the movable mold, and a clamping cylinder that houses the piston;
A hydraulic pressure source for supplying hydraulic fluid of a predetermined pressure to the mold clamping cylinder;
A tank for storing the hydraulic fluid discharged from the mold clamping cylinder;
A liquid flow path circuit for controlling the flow of hydraulic fluid between the hydraulic pressure source , the tank and the clamping cylinder;
With
The mold clamping cylinder is
A large-diameter cylinder chamber to which hydraulic fluid is supplied when the movable die plate is moved in the mold clamping direction;
A small-diameter cylinder chamber that communicates with the large-diameter cylinder chamber, has a smaller diameter than the large-diameter cylinder chamber, and is supplied with hydraulic fluid when moving the movable die plate in the mold opening direction;
Have
The piston is
The large diameter cylinder chamber is slidable in the large diameter cylinder chamber and divides the large diameter cylinder chamber into a first cylinder chamber opposite to the small diameter cylinder chamber and a second cylinder chamber on the small diameter cylinder chamber side. A piston part;
A small-diameter piston portion projecting from the end surface of the large-diameter piston portion on the small-diameter cylinder chamber side, and capable of sliding on the small-diameter cylinder chamber;
Have
From the end surface of the small-diameter cylinder chamber on the small-diameter cylinder chamber side, a rod portion that closes the opening that opens on the opposite side of the small-diameter cylinder chamber from the large-diameter cylinder chamber protrudes,
The pressure receiving area of the first cylinder chamber side of the large diameter piston portion and the second cylinder chamber side size have clamping devices than the pressure-receiving area of the.