JPH06154989A - Die clamping device for forming machine - Google Patents

Abstract

PURPOSE:To provide a die clamping device for forming machine having structure which can execute opening/closing of a nut piece in a lock nut in a comparatively simple structure and also can not open the die even if the force in the opening direction is acted to the nut piece in the case of closing the nut piece for die-clamping. CONSTITUTION:A tie rod 5 is projectingly arranged to a fixing plate to move and guide a shifting plate, and in this tie rod 5, an engaging groove of a screw, etc., is arranged on the outer peripheral surface of the part projecting to the reverse fixing plate side from the shifting plate in the condition of closing the die. Further, a split type lock member which can engage/release with/from the tie rod 5 through this engaging groove, is freely slidably arranged. On the other hand, in the slit type lock members 12a, 12b fitted to the tie rods at the left and the right sides, the nut pieces 13b, 13c inside and the nut pieces 14c, 14b outside are connected with the connecting rods 21, 22, respectively. Further, the inside nuts 13b, 13c at the left and the right sides are connected to a cylinder 24 for opening/closing arranged between the tie rods at the left and the right sides through the link.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold clamping device for a molding machine such as a die casting machine or an injection molding machine. More specifically, the mold opening and closing and the mold clamping are performed by separate cylinders and the mold clamping reaction force is applied. The present invention relates to a mold clamping device of a molding machine that also uses a tie rod that receives the same as a guide of a movable platen.

[0002]

2. Description of the Related Art A mold clamping device for a molding machine, in which a mold is opened and closed and a mold is clamped by different cylinders, and a tie rod that receives a mold clamping reaction force is also used as a guide for a moving plate, has been developed by the present applicant. There is one disclosed in Japanese Patent Publication No. 61-54574.

The mold clamping device of the molding machine described in the above publication will be described with reference to FIGS. 3 to 5.

The mold clamping device of the illustrated molding machine comprises a fixed plate 1, a fixed mold 2 attached to the fixed plate 1, and a plurality of vertically projecting pieces on the fixed plate 1 (normally four, only two in the figure). ), A moving platen 3 penetrating the tie rod 5 and moving up and down along the tie rod 5, a moving die 4 attached to the moving plate 3, and the moving plate 3 on the tie rod 5 as described above. An opening / closing cylinder 9 for vertically moving along the molds 2 and 4 to open and close the dies 2, a single-acting type mounted on the upper surface of the moving platen 3 and fitted to the tie rods 5 so as to move integrally with the moving platen 3. Mold clamping cylinder 10, piston of mold clamping cylinder 10
10a A lock nut that has a pair of nut pieces 13 and 14 that are fixed to the upper surface and that can be combined and separated, and that is fitted onto the tie rod 5.
12 and the opening / closing operation cylinder 16 for coupling and separating the nut pieces 13 and 14 of the lock nut 12, and the inner surfaces of the nut pieces 13 and 14 have female threads 13a and 14a. While the tie rod 5 is provided with
A male screw 5a is provided on the outer peripheral surface of the intermediate portion protruding above the movable platen 3 in the mold closed state shown in FIG.

The state before the mold clamping of the above apparatus is shown by the imaginary line in FIG. 3, and the movable platen 3 is at the mold opening position where the molds 2 and 4 are opened. Also, at this time, the nut piece 1 of the lock nut 12
3 and 14 are also open. From this state, the mold clamping work is performed according to the following procedure.

First, in a state where the nut pieces 13 and 14 of the lock nut 12 are opened, the movable platen 3 is lowered by the mold opening / closing cylinder 9 to bring the molds 2 and 4 into contact with each other (positions shown by solid lines in FIG. 3). . Next, in this state, the opening / closing operation cylinder 16 is operated to close the nut pieces 13 and 14, and the male screw 5a of the tie rod 5 is meshed with the female threads 13a and 14a of the nut pieces 13 and 14, and the tie rod 5 and the nut piece 13 are engaged. , 14 are integrally connected, and then four mold clamping cylinders 10 are fitted to the four tie rods 5.
Supply pressure oil to. As a result, a mold clamping force is generated between the molds 2 and 4.

In the above state, the pressure is increased in the molds 2 and 4 to perform molding. The mold opening after molding is performed in the reverse order of the mold clamping. After releasing the pressure oil of the mold clamping cylinder 10 to reduce the pressure, the nut pieces 13 and 14 of the lock nut 12 are opened and released from the tie rod 5, When the movable platen 3 is lifted by the open / close cylinder 9, the movable platen 3 is returned to the imaginary line position in FIG. 3 and the molds 2 and 4 are opened.

[0008]

In the above-described mold clamping device, the nut pieces 13 and 14 of the lock nut 12 are opened and closed by the operating force of the opening and closing operation cylinder 16 directly attached to the nut pieces 13 and 14. Therefore, when the mold clamping reaction force is large at the time of mold clamping, and the opening force more than the closing force of the nut pieces 13 and 14 acts, the nut pieces 13 and 14 easily open, Male screw 5a of tie rod 5 and nut pieces 13, 14
Since the meshing of the female screws 13a and 14a becomes poor and the load condition of the screw portion becomes severe, problems such as damage to these screw portions occur. Further, in order to prevent such a problem, it is conceivable to employ the opening / closing operation cylinder 16 having a large capacity, but it is not preferable because the opening / closing operation cylinder 16 becomes large and the hydraulic system must endure it.

The present invention has been made to solve the above problems, and its purpose is to open and close a nut piece of a lock nut with a relatively simple structure and to clamp a mold. (EN) A mold clamping device of a molding machine having a structure in which when a nut piece is closed, the nut piece does not open even when a force in the opening direction is applied.

[0010]

In order to achieve the above object, a mold clamping device of a molding machine according to the present invention comprises a movable platen for supporting a movable mold, and a fixed plate for supporting a fixed mold by an opening / closing cylinder. In a mold clamping device of a molding machine configured to move in a direction of approaching and separating from a board to open and close the mold, and to perform mold clamping with a mold clamping cylinder in a mold closed state, to guide the movement of the movable plate. A tie rod is projected on the fixed plate, and this tie rod is provided with an engagement groove such as a screw on the outer peripheral surface of the portion projecting from the movable plate to the side opposite to the fixed plate in the mold closed state, and the engagement groove is formed. While a split-type lock member that can be engaged and disengaged with the tie rod is provided slidably in the tie-rod axial direction, among the split-type lock members attached to the left and right tie rods, the inner lock member and the outer lock member are Connect with connecting rods Together, the left and right inner locking member is made by connecting by interposing a link opening and closing cylinder disposed between the left and right tie rods.

Further, instead of the split-type lock members attached to the left and right tie rods, split-type lock members attached to the upper and lower tie rods are connected to the inner lock member and the outer lock member by connecting rods, respectively. In addition, the upper and lower inner lock members may be connected to the opening / closing operation cylinder provided between the upper and lower tie rods by interposing a link.

[0012]

According to the present invention, the lock member is provided on the upper surface of the movable plate so that the lock member can be engaged with and disengaged from the tie rod, and the inner lock member and the outer lock member of the split type lock members attached to the left and right tie rods are provided. In addition to connecting with the connecting rods, the left and right inner lock members are connected to the opening and closing operation cylinder provided between the left and right tie rods with the link interposed, so that the opening and closing operation cylinder is operated and the links are aligned. The lock member is not opened unless the opening / closing cylinder is returned to its original position. As a result, the engagement between the male screw of the tie rod and the female screw of the nut piece does not deteriorate, and problems such as damage to the threaded portion are improved.

Further, since it functions as described above, the opening / closing operation cylinder may be a pneumatic cylinder, and in this case, the mechanism is extremely simple as compared with the hydraulic mechanism.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a partial cross-sectional side view of a mold clamping device of a molding machine according to the present invention, and FIG. 2 is an enlarged cross-sectional view of a main portion XX of FIG. In the figure, the same parts as those of the conventional device described in the related art are designated by the same reference numerals.

Reference numeral 1 is a fixed plate, 2 is a fixed mold attached to the fixed plate 1, 3 is a movable plate, and 4 is a movable mold attached to the movable plate 3. A plurality of (normally four, only two are shown in the figure) tie rods 5 penetrating the movable platen 3 are vertically projected on the fixed platen 1, and the movable platen 3 is vertically moved by the tie rods 5, that is, fixed. It is configured to guide the movement in a direction of approaching and separating from the board 1.

6 is a bush provided in the tie rod penetrating portion of the movable platen 3, 7 is the bush holder, 8 is a support plate for supporting the upper end of the tie rod 5, and 9 is the movable platen 3 along the tie rod 5 as described above. Move up and down to move the mold 2,
An opening / closing cylinder for opening / closing the cylinder 4. The cylinder 9 is provided between the fixed platen 1 and the movable platen 3.

Reference numeral 10 denotes a single-acting mold clamping cylinder, which is attached to the four corners of the upper surface of the moving platen 3 and is fitted to the tie rod 5 so as to be able to move integrally with the moving platen 3. Reference numeral 11 is a compression coil spring for returning the mold clamping cylinder 10.

Reference numeral 12 denotes a lock nut as a lock member, which is formed in a split mold shape composed of a pair of nut pieces 13 and 14 which can be coupled and separated with internal threads 13a and 14a on the inner surface. The tie rod 5 is externally fitted in the bracket 15 fixed to the upper surface of the piston 10a of the tightening cylinder 10, while the left and right lock nuts 12a and 12b are provided with nut pieces 13b and 14 respectively.
Inner nut piece 13b of lock nut 12a among b, 13c and 14c
And the outer nut piece 14c of the lock nut 12b, and the outer nut piece 14b of the lock nut 12a and the lock nut 12b.
The inner nut pieces 13c are connected to each other by connecting rods 19 and 20, and links 21a and 21b are rotatably attached to the inner side surfaces of the inner nut pieces 13b and 13c (see FIG. 2). On the other hand, the tie rod 5 is provided with a male screw 5a on the outer peripheral surface of the intermediate portion protruding above the moving platen 3 in the mold closed state shown in FIG.
When the lock nut 12 is brought into a closed state in which both nut pieces 13 and 14 are combined, the lock nut 12 and the tie rod 5 are engaged with each other via the screws 13a, 14a and 5a, and become an integrated state in the axial direction. Further, when the nut pieces 13 and 14 are separated and the lock nut is opened, the lock nut 12 can be moved up and down along the tie rod 5 together with the mold clamping cylinder 10 and the movable platen 3.

Reference numeral 22 denotes a cylinder for opening and closing the lock nut 12, which is mounted on the upper surface of the movable platen 3 with a mounting base 22a interposed, and the connecting metal fitting 24 mounted on the tip of the piston rod 23 has the above-mentioned structure. One ends of the links 21a and 21b are rotatably pin-coupled. Thus, if the opening / closing cylinder 22 is extended until the links 21a, 21b are aligned, both nut pieces 13b, 14b and 13c, 14c move simultaneously in the direction of close proximity, and the lock nuts 12a, 12b close. ,Also,
If the cylinder 22 is contracted, both nut pieces 13b, 14b
And 13c and 14c move in the direction in which they are separated from each other, so that the lock nut 12 is opened. Therefore, after the opening / closing cylinder 22 is extended and the lock nuts 12a and 12b are closed, unless the cylinder 22 is contracted, even if a force in the opening direction is applied to the lock nuts 12a and 12b, the links 21a and 21b.
Does not open because it is aligned (see Figure 2b).

The state before the mold clamping of the mold clamping device having the above-mentioned structure is shown by the phantom line in FIG. 1, and the movable platen 3 is at the mold releasing position where the molds 2 and 4 are opened. At this time, the nut pieces 13 and 14 of the lock nut 12 are also open. From this state, the mold clamping work is performed according to the following procedure.

The movable platen 3 is lowered by the opening / closing cylinder 9 from the mold open position shown by the phantom line in FIG. 1, the molds 2 and 4 are closed as shown by the solid line, and pressure oil is supplied to the mold clamping cylinder 10 in this state. . At this time, at the same time or prior to the mold clamping cylinder 10, pressure oil is also supplied to the extension side of the lock nut operating cylinder 22. As a result, the mold clamping cylinder 10 extends and the movable platen 3 rises, the lock nut 12 closes, and the lock nut 12 and the tie rod 5 are screwed with each other by screws 13a, 14a,
When 5a coincides with each other, they are engaged with each other to be in an axially integrated state. Therefore, the mold clamping reaction force due to the expansion of the mold clamping cylinder 10 is received by the tie rod 5 via the lock nut 12, and the molds 2, 4
Is clamped with a great force.

In this state, the pressure inside the molds 2 and 4 is increased to perform molding. To open the molds 2 and 4 after molding, the procedure opposite to the mold clamping is performed, and the pressure oil is released from the mold clamping cylinder 10 and at the same time, the lock nut operating cylinder 22 is operated toward the contracting side. With this, the mold clamping force is released, and at the same time, the lock nut 12 is opened and separated from the tie rod 5. If the movable platen 3 is raised by the open / close cylinder 9 in this state, the mold clamping cylinder 10 and the lock nut 12 are guided together with the movable platen 3 by the tie rods 5 to be raised and returned to the phantom line position in FIG. 4 opens.

(Embodiment 2) FIG. 3 is a partial sectional side view of a mold clamping device of a molding machine according to another embodiment of the present invention. In the figure, the same parts as those of the mold clamping device of the first embodiment are designated by the same reference numerals.

Reference numeral 1 is a fixed platen, 2 is a fixed mold attached to the fixed platen 1, 3 is a movable platen, which is composed of upper and lower movable plates 3a and 3b. Reference numeral 4 is a moving die attached to the lower moving platen 3b.
A plurality of fixed plates (usually 4
Tie rods 5 (only two are shown in the drawing) are provided so as to vertically project, and the tie rods 5 are configured to move and guide the movable platen 3, that is, to move and guide the movable platen 3 toward and away from the fixed plate 1. There is.

Reference numeral 25 is a bush provided in the tie rod penetrating portion of the upper moving platen 3a, 26 is a bush provided in the tie rod penetrating portion of the lower moving platen 3b, 8 is a support plate for supporting the upper end of the tie rod 5, and 9 is a moving platen. Tie rod 5 as described above
It is an opening / closing cylinder for moving the molds 2, 4 up and down along the axis to open and close the dies 2, 4. The cylinder 9 is laid between the fixed platen 1 and the movable platen 3.

Numeral 27 is a double-acting type clamping cylinder, which is an upper moving platen 3a.
A piston 27a is inserted into a downward hole 28 formed in the central portion of the piston 27a, and the lower end of the piston 27a is fixed to the central upper surface of the lower moving platen 3b.

Reference numeral 12 is a lock nut as a lock member, which is formed in a split mold shape consisting of a pair of nut pieces 13 and 14 which can be coupled and separated with internal threads 13a and 14a on the inner surface. In the bracket 15 fixed to the upper surface of the movable platen 3a, the tie rod 5 is externally fitted to the bracket 15, while the left and right lock nuts 12a and 12b have nut pieces 13b, 14b, 13c and 14c.
Inner nut piece 13b of lock nut 12a and lock nut 12
the outer nut piece 14c of b and the outer nut piece 14b of the lock nut 12a and the inner nut piece 13c of the lock nut 12b.
And are connected by connecting rods 19 and 20, respectively,
Links 21a, 21b are rotatably attached to the inner side surfaces of the inner nut pieces 13b, 13c (see FIG. 2). On the other hand, the tie rod 5 is provided with a male screw 5a on the outer peripheral surface of the intermediate portion projecting above the moving platen 3 in the mold closed state shown in FIG. Nut 12,
When the nut pieces 13 and 14 are brought into a closed state in which the nut pieces 13 and 14 are connected to each other, the lock nut 12 and the tie rod 5 are engaged with each other via the screws 13a, 14a and 5a to be integrally formed in the axial direction. Also, both nut pieces
When the lock nuts 13 and 14 are separated and opened, the lock nut 12 locks the mold clamping cylinder 27 and the movable platen 3.
At the same time, it can be moved up and down along the tie rods 5.

Reference numeral 22 denotes a cylinder for opening and closing the lock nut 12, which is attached to the upper surface of the movable platen 3 and has a connecting fitting 24 attached to the tip of its piston rod 23, which has one end of the above-mentioned links 21a and 21b. Is rotatably pin-coupled. Then, the opening / closing operation cylinder 22 is linked to the links 21a, 21b.
If the nuts 13b, 14b and 13c, 14c move in the direction in which they approach each other at the same time, the lock nuts 12a, 12b close, and if the cylinder 22 is contracted, The lock nuts 12 are configured to open by moving the nut pieces 13b, 14b and 13c, 14c in a direction in which they are separated from each other. Therefore, after the opening / closing operation cylinder 22 is extended to close the lock nuts 12a and 12b, the links 21a and 21b are aligned even if a force in the opening direction is applied to the lock nuts 12a and 12b unless the cylinder 22 is contracted. It does not open because it is marked (see Figure 2b).

The state before the mold clamping of the above-described mold clamping device is shown by the imaginary line in FIG. 3, and the movable platen 3 is at the mold opening position where the molds 2 and 4 are opened. At this time, the nut pieces 13 and 14 of the lock nut 12 are also open. From this state, the mold clamping work is performed according to the following procedure.

The movable platen 3 is lowered by the opening / closing cylinder 9 from the mold open position shown by the phantom line in FIG. 3, the molds 2 and 4 are closed as shown by the solid line, and pressure oil is supplied to the mold clamping cylinder 27 in this state. . At this time, at the same time or prior to the mold clamping cylinder 27, pressure oil is also supplied to the extension side of the lock nut operating cylinder 22. As a result, the mold clamping cylinder 27 extends and the upper moving platen 3a rises, the lock nut 12 closes, and the lock nut 12 and the tie rod 5 are mutually screwed with the screws 13a, 14a.
When a and 5a coincide with each other, they are engaged with each other to be in an axially integrated state. Therefore, the mold clamping reaction force due to the expansion of the mold clamping cylinder 27 is received by the tie rod 5 via the lock nut 12, and the molds 2 and 4 are clamped with a strong force.

In this state, the pressure in the molds 2 and 4 is increased to perform molding. To open the molds 2 and 4 after molding, the procedure opposite to the mold clamping is performed, and the pressure oil is released from the mold clamping cylinder 27, and at the same time, the lock nut operating cylinder 22 is operated to the contracting side. With this, the mold clamping force is released, and at the same time, the lock nut 12 is opened and separated from the tie rod 5. When the movable platen 3 is raised by the opening / closing cylinder 9 in this state, the mold clamping cylinder 27 and the lock nut 12 are guided together with the movable platen 3 by the tie rods 5 to be raised, and returned to the phantom line position in FIG. 4 opens.

In the above description, the vertical molding machine is taken as an example, but the present invention is not limited to this example.
The same applies to a horizontal molding machine.

[0034]

As described above, in the mold clamping device of the molding machine according to the present invention, the left and right or upper and lower lock members are connected to the opening / closing cylinder through the link, so that they are relatively simple. Due to the structure, the nut piece of the lock nut can be opened and closed, and the left and right or upper and lower lock members can be closed by operating the opening / closing cylinder and operating the links in a straight line. The release of the lock member is restricted and the lock member is not released unless the opening / closing cylinder is returned to its original position. Therefore, the engagement between the male screw of the tie rod and the female screw of the nut piece does not deteriorate, and problems such as damage to the screw portion are improved.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view of a mold clamping device of a molding machine of the present invention.

FIG. 2 is an enlarged cross-sectional view of the main part of XX in FIG. 1, where a is an explanatory view when the lock member is open and b is an explanatory view when the lock member is closed.

FIG. 3 is a partial sectional side view of a mold clamping device of a molding machine according to another embodiment of the present invention.

FIG. 4 is a partial cross-sectional side view of a mold clamping device of a conventional molding machine.

5 is an enlarged sectional view taken along line AA of FIG.

6 is an enlarged sectional view taken along line BB of FIG.

[Explanation of symbols]

1: Fixed plate 2: Fixed mold
3: Moving board 3a: Upper moving board 3b: Lower moving board
4: Moving mold 5: Tie rod 5a: Male screw
6: Bush 7: Bush holder 8: Support plate
9: Open / close cylinder 10: Mold clamping cylinder 11: Compression coil spring 1
2: Lock nut 13, 14, 13b, 14b, 13c, 14c: Nut piece 13
a, 14a: Female thread 15: Bracket 19, 20: Connecting rod 21
a, 21b: Link 22: Lock nut opening / closing cylinder 22
a: Mounting base 23: Piston rod 24: Connecting bracket 2
5, 26: Bush 27: Mold clamping cylinder 27a: Piston 2
8: Downward hole

Claims (2)

[Claims] 1. A movable platen for supporting a movable mold is moved by an opening / closing cylinder in a direction in which the movable platen comes in and out of contact with a fixed plate supporting a fixed mold to open and close the mold, and the mold is closed. In a mold clamping device of a molding machine configured to perform mold clamping by a clamping cylinder, a tie rod is projected from a fixed plate to guide the movement of the movable plate, and the tie rod is mounted on the movable plate while the mold is closed. An engaging groove such as a screw is provided on the outer peripheral surface of the portion projecting to the fixed plate side, and a split-type lock member that can be engaged with and disengaged from the tie rod through the engaging groove is provided slidably in the tie rod axial direction. Among the split type lock members attached to the left and right tie rods, the inner lock member and the outer lock member are connected by connecting rods, respectively, and the left and right inner lock members are opened and closed provided between the left and right tie rods. operation A mold clamping device for a molding machine, characterized in that it is connected to a working cylinder via a link. 2. The split lock members attached to the upper and lower tie rods, instead of the split lock members attached to the left and right tie rods, are connected to the inner lock member and the outer lock member by connecting rods, respectively. The mold clamping device for a molding machine according to claim 1, wherein the upper and lower inner lock members are connected to an opening / closing operation cylinder provided between the upper and lower tie rods with a link interposed.