JP2649583B2 - Tie bar attachment / detachment mechanism - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a die casting machine and a tie bar attaching / detaching mechanism of an injection molding machine.

[Conventional technology]

A conventional mechanism for attaching and detaching a tie bar to and from a fixed die plate will be described with reference to FIGS. 3 and 4.
The half nut mechanism 40 that is screwed to the 16
16 is screwed around the left and right, half nut right
It is divided into 32 and half nut left 34. The two half nuts 32 and 34 are rotatably connected to each other by a pin 37, and open from side to side from the nut tightened state shown in FIG. 3 (b) to the open state shown in FIG. I have.

The half nut left 34 is rotatably connected via a pin 35 at one corner A of the substantially triangular link 30, and the other corner B of the link 30 is rotatably connected to the hydraulic cylinder 39. When the piston rod 38 of the hydraulic cylinder 39 moves leftward in the drawing from the state shown in FIG. 3 (b), the left half nut 34 is rotated about the pin 37 so as to open as shown in FIG. It has become.

On the other hand, the right half nut 32 is rotatably mounted at one end of a link 31 via a pin 33, and the other end of the link 31 is rotatably mounted at another angle C of the link 30 by a pin 36. When the piston rod 38 of the hydraulic cylinder 39 moves leftward from the state shown in FIG. 3 (b), the link 31 rotates about the pin 33 at one end, and the other end stands up as shown in FIG. At the same time, the right half nut 32 rotates about the pin 37, and is opened as shown in FIG.

Therefore, when tightening the tie bar screw 16 with the half nuts 32 and 34, the piston rod 38 of the hydraulic cylinder 39 is moved rightward in the drawing from the state shown in FIG.
When the piston rod 38 is further advanced rightward as shown in the figure, the half nuts 32 and 34 are rotated in the tightening direction, and the tie bar 31 is pulled rightward in the figure to give a preload.

[Problems to be solved by the invention]

However, in the conventional coupling mechanism between the tie bar and the fixed die plate, the half nut mechanism is closed with the hydraulic cylinder, and then the nut is turned in the tightening direction to tighten the tie bar screw. A high sliding surface pressure acts on the pressing contact surface D, and the sliding surface is seized or damaged by abrasion.
There was a need for forced lubrication.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate a wear accident caused by attaching and detaching a tie bar screw in a conventional half nut mechanism, and to provide a mechanism for attaching and detaching a fixed die plate and a tie bar having a simple structure.

[Means for solving the problem]

To achieve the above object, a tie bar attaching / detaching mechanism of a die casting machine and an injection molding machine according to the present invention includes one or more annular grooves provided on one side of a fixed die plate side of a tie bar, and the plurality of divided collars. An actuator that moves forward and backward and moves into and out of the annular groove, and is radially split into the annular groove and fitted into the annular groove from outside, and is moved between the fixed die plate and a guide block for guiding to move forward and backward. A tie bar attachment / detachment mechanism having a collar, comprising: a hydraulic cylinder on one side of the tie bar, which presses the end face in the axial direction, and loads a compression preload, wherein the hydraulic cylinder is retracted by a piston of the hydraulic cylinder. In this case, the tip of the piston acts as a stopper for the tie bar end face to accurately position the tie bar end face. It is characterized by being also used as a stopper.

In the tie bar attaching / detaching mechanism, a screw groove provided on one side of the fixed die plate side of the tie bar, a nut screwed into the screw groove, and attached to one side of the tie bar,
It is characterized by comprising a fluid pressure cylinder which presses the same end face and loads a compression preload.

(Operation)

According to the present invention, at the time of coupling the tie bar to the fixed die plate, the collar is provided on one side of the fixed die plate side of the tie bar by the actuator attached to each of the plurality of divided collars. After engaging with the groove, one end face of the tie bar was pressed with a fluid cylinder to couple the tie bar to the fixed die plate, and when removing the fixed die plate and the tie bar, the fluid cylinder was retracted from the tie bar end face. Thereafter, the actuator disengages the tie bar from the fixed die plate by engaging the collar from the tie bar groove.

When using a nut instead of a split collar, screw the nut into the thread groove provided on one side of the fixed die plate side of the tie bar, then operate the fluid pressure cylinder to press one end surface of the tie bar. Attach the tie bar to the fixed die plate, and when removing the fixed die plate and tie bar,
After the fluid cylinder is retracted from the tie bar end face, the nut is unscrewed from the tie bar screw groove to release the connection between the fixed die plate and the tie bar.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIG.

In the following description, the same components as those in the above-described conventional example are denoted by the same reference numerals, description thereof will be omitted, and only newly added members will be described.

An annular groove 14 is provided on one side of the fixed die plate 12 of the tie bar 11.
The collar 15 divided into a plurality of pieces in the radial direction is slidably moved in and out along the end face E of the fixed die plate 12 in the annular groove 14. The collar 15 is provided with a piston rod 9 of an actuator 16 which is a hydraulic cylinder, so that the collar 15 can move forward and backward.

The upper half of the center line of the tie bar 11 is shown with the collar 15 removed from the annular groove 14 by the actuator 16.

The lower half of the center line of the tie bar 11 is shown in a state where the collar 15 is fitted into the annular groove 14 by the actuator 16.

The collar 15 has a guide block 17 and a fixed die plate.
It is slidably guided between 12 and pinched. The guide block 17 is fixed to the fixed die plate 12 with bolts 18 together with the fluid pressure cylinder 19. This hydraulic cylinder
A freely slidable piston 20 is inserted into the inner diameter of 19, and the piston 20 has a sufficient pressing force to apply a compression preload to the tie bar 11 on the fixed die plate 12.

At the retreat limit of the piston 20 (the right limit in the figure), the tip 21 of the piston rod acts as a stopper for positioning the end face 22 of the tie bar, and the positioning of the collar 15 in the annular groove 14 is reliably performed.

Supply and discharge of hydraulic oil to and from the hydraulic cylinder 19 are performed by hydraulic ports 7 and 8 connected to a solenoid valve 23.

On the other side of the tie bar 11, a piston rod of a tie bar pull-out cylinder 25 attached to the link housing 13 is attached.When pulling out the tie bar 11, the tie bar 11 is pulled out to the left in the drawing, and the pull-out cylinder 25 is pulled out. At the retreat limit (right limit in the figure), the tie bar 11 is positioned at the upper half of the center line of the tie bar 11 in FIG. It is supposed to. Therefore, the attachment of the tie bar 11 to the fixed die plate 12
After the positioning of the tie bar 121 is performed, the actuator 16 is actuated to fit the collar 15 into the annular groove 14, and then the operating oil is supplied to the hydraulic port 7 of the hydraulic cylinder 19 to press the piston 20, and As shown in the lower half of the center line of the tie bar in FIG.
The collar 15 is pressed against the fixed die plate 12 via the shoulder surface 24 of the annular groove 14 to securely fix the tie bar 11 to the fixed die plate 12.

Another embodiment of the present invention will be described with reference to FIG.
A screw 28 is provided on one side of the tie bar 26, and a tie bar nut is provided.
27 is screwed. As shown in the upper half of the center line of the tie bar 26 in this figure, the end surface 22 of the tie bar abuts on the tip 21 of the piston rod 20 of the fluid pressure cylinder 19, and the insertion position of the tie bar 26 is positioned. Next, the tie bar nut 27 is tightened to the fixed die plate 12, hydraulic oil is supplied to the hydraulic port 7, and the piston 20 is pressed to compress the tie bar 26 as shown in the lower half of the tie bar center line. , And the shoulder surface F of the tie bar nut 27 is pressed against the fixed die plate 12 to securely fix the tie bar 26 to the fixed die plate 12.

〔The invention's effect〕

As described above, according to the present invention, it is possible to eliminate a wear accident occurring when a preload is applied by tightening at the time of attaching and detaching a tie bar screw in a conventional half nut mechanism, and a tie bar to a fixed die plate having a simple structure. There is an effect that a detachable mechanism can be provided.

In the above embodiment, the case where the groove of the tie bar into which the split collar is fitted is described as one, but the number of the groove is not limited to one, and a plurality of grooves can be provided, and the load is dispersed compared to the case of one. More effective.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of one embodiment of the present invention, FIG. 2 is a partial cross-sectional view of another embodiment of the present invention, FIG. (B) is a front view showing a state where the split nut is closed, and FIG. 4 is a front view showing a state where the split nut is open. 12 ... fixed die plate, 14 ... annular groove, 15 ... collar, 16 ... actuator, 17 ... guide block, 19
…… Fluid cylinder, 20… Piston, 27… Tie bar nut, 28 …… Tie bar screw.

Claims (1)

(57) [Claims] An annular groove provided on one side of the fixed die plate side of the tie bar; and a plurality of radial grooves which are fitted into the annular groove from an outer diameter direction and are divided into a plurality of grooves. A tie bar attachment / detachment mechanism having a collar which is sandwiched between the guide blocks and which moves forward and backward, and an actuator which advances and retreats the collar and moves the collar into and out of the annular groove. And press
A hydraulic cylinder for loading a compression preload, wherein the hydraulic cylinder also serves as a stopper for accurately positioning the tie-bar end surface, with the tip of the piston acting as a stopper for the tie-bar end surface at the retreat limit of the piston of the hydraulic cylinder. A tie bar attachment / detachment mechanism characterized by the following.