JP2883240B2 - Injection molding machine with a guide mechanism for loading and unloading molds - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for transferring a mold between a fixed platen and a movable platen of an injection molding machine (hereinafter collectively referred to as a base plate) in a horizontal direction or discharging the die from between the base plates. The present invention relates to an injection molding machine having a guide mechanism for guiding a mold.

[0002]

2. Description of the Related Art As shown in FIG. 3, a fixed die 9 is transferred on a plurality of receiving rollers 30 rotatably supported by a shaft 40 on a fixed plate 2 and a movable plate 4 via bearings 50, respectively. A mechanism for guiding the opposing inner surfaces of the mold mounting plates 9A and 10A of the movable mold 10 by a plurality of guide rollers 60, 60 prevents contact between the mold 8 and the base. However, according to such a guide mechanism, when the movable platen 4 stops before reaching the predetermined position, for example, when the mold 8 is carried in, the movable platen plate 10A interferes with the guide roller 60 on the movable platen side. When the loading of the mold 8 is blocked or the fixed mold 9 and the movable mold 10 are opened, or when the movable platen 4 stops at a position beyond a predetermined position,
A malfunction or an accident occurs such that the guide 8 cannot be guided by the guide rollers 60 and the regulated mold 8 comes into contact with the base plate. That is, such a guide mechanism requires strict stopping accuracy of the movable platen in order to sufficiently exhibit its performance.

[0003]

SUMMARY OF THE INVENTION The present invention is capable of guiding a mold in a fixed position and avoiding contact with a base plate without requiring strict stop accuracy of a movable platen when the mold is carried in and out. It is an object to obtain an injection molding machine having a guide mechanism.

[0004]

A circular outer peripheral portion having a predetermined width with which the lower surface of the fixed die mounting plate of the mold can abut, and both end edges of the circular outer peripheral portion are respectively formed at predetermined positions below the fixed platen. A guide roller formed with a flange portion having a predetermined inclination angle toward the outside as a part, in a state in which a resilient urging member constantly receives a repulsive urging force from the fixed plate side toward the movable platen side,
A position rotatable in a direction parallel to a mold mounting surface of the fixed plate, and a position where the base portion of the flange portion on the fixed plate is a predetermined distance outward from the mold mounting surface of the fixed plate and a position where the base is retracted and retracted inward. Between the shaft and the shaft at the time of movement, and provided at a plurality of locations movably supported via a bearing having a friction coefficient of μf. A receiving roller having a predetermined width capable of contacting and having a friction coefficient μv between itself and the lower surface of the movable mounting plate larger than the friction coefficient μf is rotated in a direction parallel to the mold mounting surface of the movable plate. An injection molding machine provided with a guide mechanism for loading and unloading a mold, which is provided at a plurality of positions so as to be freely and axially supported without allowing movement in the axial direction.

[0005]

When the mold is carried in and out, the mold is guided by the urging force of the resilient member between the flanges of the guide rollers spaced a predetermined distance from the mold mounting surface of the fixed plate while guiding the fixed mold mounting plate. Transfer. Since the guide of the mold is securely performed on the fixed mounting plate side, the guide on the movable mounting plate side is not required, and therefore, strict stopping accuracy of the movable plate is not required. At the time of pressing the mold, the fixed mold mounting plate of the mold to be pressed presses the base of the flange on the fixing plate side of the guide roller, and overcomes the elastic urging force of the elastic urging member. Since the base of the flange on the fixed plate side of the guide roller is retracted into the fixed plate and retracted,
The guide roller is of course not damaged.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS.

Reference numeral 1 denotes a base of an injection molding machine (not shown). Reference numeral 2 denotes a fixed plate attached on the base 1. Reference numeral 3 denotes a plurality of tie bars which are tensioned between a flange portion of a mold clamping cylinder (not shown) and the fixed platen 2. Reference numeral 4 denotes a movable plate attached to the tip of a mold clamping ram 5 inserted into the mold clamping cylinder. The movable plate 4 moves along the plurality of tie bars 3 based on the reciprocation of the mold clamping ram 5 with respect to the fixed plate 2. Move closer and further away. The surfaces of the fixed platen 2 and the movable platen 4 facing each other are a mold mounting surface 2A and a mold mounting surface 4A, respectively. Reference numeral 6 denotes a heating cylinder on the side of the injection device, and reference numeral 7 denotes a nozzle attached to the tip of the heating cylinder 6.

Reference numeral 8 denotes a mold including a pair of a fixed mold 9 and a movable mold 10. 9A is a fixed mounting plate and 10A is a movable mounting plate.

First, the configuration of the fixed board 2 will be described in detail. As is particularly clear from the enlarged sectional view of FIG.
Reference numeral 1 denotes a guide roller for guiding the fixed mounting plate 9A of the fixed die 9 when the die 8 is carried in and out of the base plate. The guide roller 11 has a circular outer peripheral portion 11A having a predetermined width with which the lower surface of the fixed die mounting plate 9A can abut, and a predetermined inclination toward the outside with both end edges of the circular outer peripheral portion 11A as base portions 11B. Flanges 11C, 11C with angles
Are formed. In the present embodiment, the circular outer peripheral portion 11 is used.
The width of A is a dimension obtained by adding 1 mm to the plate thickness of the fixed mounting plate 9A, that is, 26 mm when the plate thickness of the fixed mounting plate 9A is 25 mm, and the inclination angle of the flange portion is 15 degrees (therefore, the flange portion is inclined). Is 30 degrees). If the inclination angle is too large, the fixed mounting plate 9A will ride on the flange 11C during guiding, and if too small, the fixed mounting plate 9A and the flange 11C will interfere with each other during insertion. It is defined as around 15 degrees.

Reference numeral 12 denotes a shaft which passes through the centers of two recesses 13 and 14 formed in the mold mounting surface 2A and is attached to the fixed platen 2 by screwing. 15 is a snap ring 16,
The bearing is integrally fixed to the guide roller 11 by 16 and is fitted to the shaft 12 so as to be rotatable in the direction parallel to the mold mounting surface 2A of the fixed platen 2 and movable in the axial direction. The bearing 15 has a friction coefficient μf when moving in the axial direction.
In this embodiment, a commercially available stroke ball bearing is used in order to reduce the size of the ball. 17 is fixed board 2
And a coil spring as a resilient urging member which is fitted around the outer periphery of the shaft 12 and is fitted into the concave portion 14 of the shaft 12. Coil spring 17
Accordingly, the guide roller 11 is constantly provided with a resilient urging force from the fixed platen 2 side toward the head 12A side of the shaft 12, and accurate positioning is performed. This resilient biasing force is about 3 kg to 6 kg in a small injection molding machine, and is extremely small as compared with the mold clamping force. Reference numerals 18 and 18 denote lubricating alloy washers interposed between the coil spring 17 and the head 12A of the shaft 12 which are in sliding contact with both end surfaces of the bearing 15 of the guide roller 11 which rotates while receiving the elastic urging force. It is.

The guide roller 11, which receives the urging force of the coil spring 17, rotates the shaft 1 via a washer 18.
2, the base 11B of the flange of the guide roller 11 on the side of the fixed platen 2 is always at a predetermined distance from the mold mounting surface 2A, in this embodiment 2.5 m.
m, on the outside. Also, the guide roller 11
Is movable to a position where the base 11B of the flange on the fixed platen 2 side retracts and retracts inside the mold mounting surface 2A of the fixed platen 2 against the elastic biasing force of the coil spring 17. That is,
The compression allowance of the coil spring 17 is sufficiently matched, and in this embodiment, it is 4.5 mm.
Is larger than the outer diameter of the flange 11C of the guide roller 11.

As described above, in the present embodiment, the guide roller 11 can be moved along the shaft 12 at four predetermined positions below the fixed platen 2.

Reference numeral 19 denotes an insertion guide roller unit fixed to the side surface of the fixed platen 2 and attached to the outside of the injection molding machine. The insertion guide roller unit 19 includes a guide roller 11 on a bracket 20 fixed to the fixed platen 2, and a base portion 11 </ b> B of four guide rollers 11 movable in the axial direction 12 on the fixed platen 2 side having a mold mounting surface 2 </ b> A. From 2.5mm
According to the present embodiment, two parts are mounted in a state in which they are rotatable and do not allow movement in the axial direction according to the position on the outside. The insertion guide roller unit 19 is for a so-called me between the mold conveying conveyor (not shown) or the like outside the injection molding machine and the inside of the base plate.

Next, the structure of the movable platen 4 will be described. Reference numeral 21 denotes a receiving roller with which the lower surface of the movable mold mounting plate 10A comes into contact when the mold 8 is transferred. The receiving roller 21 is connected to the mold mounting surface 4A via a bearing 23 by a shaft 22 which is attached to the movable platen 4 at a right angle by screwing. It is rotatably supported in a parallel direction and does not allow axial movement. The width of the receiving roller 21 is
Since the fixed mounting plate 9A is guided by the guide rollers 11 on the fixed platen 2 side, when the movable platen 4 stops before reaching the predetermined position, the movable mounting plate 10A does not come off the receiving roller 21 and is movable. When the board 4 stops after passing a predetermined position, the dimension can be determined as a dimension in which the movable mounting plate 10A does not contact the movable board 4. That is, it can be determined as a dimension corresponding to the stopping accuracy of the movable platen 4. The friction coefficient μv between the receiving roller 21 and the movable mounting plate 10A is calculated from the friction coefficient μf between the shaft 12 and the bearing 15 formed of a stroke ball bearing in the moving direction of the guide roller 11 on the fixed platen 2 side. Naturally, it is a big one. The receiving rollers 21 are provided at four positions at predetermined positions below the movable platen 4.

Reference numeral 24 denotes an insertion receiving roller unit fixedly mounted on the side surface of the movable platen 4 corresponding to the insertion guide roller 19 on the fixed platen 2 side. Insertion roller unit 24
In FIG. 2, two receiving rollers 21 are rotatably supported by a shaft 22 via a bearing 23 on a bracket 25 fixed to the movable platen 4.

Next, the operation will be described. The selector switch of the control device (not shown) is switched from the normal operation to the mold change, and the carry-in start switch is pressed. The movable platen 4 is moved forward by the mold clamping ram 5 and stops at a predetermined position based on the mold thickness input to the control device in advance. On a die conveyor, for example, outside the injection molding machine, the die 8 is positioned at a position where it can be inserted into the guide roller 11 of the insertion guide roller unit 19 and is on standby. At this time, the four guide rollers 11 provided on the fixed platen 2
7, the base 11B of the flange on the side of the fixed platen 2 is pushed out from the mold mounting surface 2A by a distance of 2.5 mm. By means of a pusher or the like, the distance between the mold mounting surface 2A of the fixed platen 2 and the fixed mold mounting plate 9A is a minimum of 2.5.
mm to 3.5 mm, and between the mold mounting surface 4A of the movable platen 4 and the movable die mounting plate 10A, a gap that does not interfere with each other even if there is a variation in the stop position of the movable platen 4. While being carried between the platforms. Although not shown,
When it is confirmed by the position confirmation means such as the proximity switch and the limit switch that the die 8 has been carried into the predetermined position in the base plate, the mold clamping ram 5 and the movable plate 4 are moved based on the confirmation signal. Moving forward, mold clamping is performed. Fixed type mounting plate 9
A is a flange 11C on the fixed platen 2 side of the four guide rollers 11
Is pressed at its base 11B, and the four flanges 11C are retracted into the recess 13 of the fixed platen 2 against the urging force of the coil spring 17. In the case of an injection molding machine provided with a mold clamp cylinder, the mold clamp cylinder clamps the mold 8 at the positions of the fixed mold mounting plate 9A and the movable mold mounting plate 10A. In the case of an injection molding machine having no mold clamp cylinder, the operator fastens the mold 8 to the base using bolts or the like.

When the mold 8 is carried out, first, the mold clamp cylinder is returned to the unclamped state, or after the fastening bolts and the like are removed, the movable platen 4 is retracted. At this time,
Coefficient of friction μv between receiving roller 21 and movable mounting plate 10A
A shaft 15 in the direction of movement of the guide roller 11 on the fixed platen 2 and a bearing 15 comprising a stroke ball bearing.
First, the four guide rollers 11 are attached to the head 12A of the shaft 12 because the friction coefficient μf is larger than the friction coefficient μf.
, Where the guide rollers 1
The base 11B of the flange on the side of the fixed platen 2 is the mold mounting surface 2A.
Up to 2.5mm from the mold mounting surface 2A
And only the fixed type mounting plate 9A is opened. Thereafter, that is, after the mold 8 is positioned with a predetermined gap kept between the mold 8 and the mold mounting surface 2A on the fixed platen 2 side, the mold 8 is positioned with respect to the lower surface of the movable mold mounting plate 10A on the movable platen 4 side. Rollers 21
Of the movable mold mounting plate 10A and the mold mounting surface 4A
The movable platen 4 stops with a proper gap kept between the movable platen 4 and the moving platen 4. Thereafter, the mold 8 is carried out of the injection molding machine by a puller or the like of a mold conveying conveyor.

[0018]

According to the present invention, when the mold is carried into or out of the board of the injection molding machine, the mold can be guided only on the fixed board, and the movable board can be guided on the movable board. Since the receiving roller does not require a guide, it is possible to prevent accidents such as contact between the base plate and the mold and dropping of the mold without requiring strict stopping accuracy of the movable plate.

[Brief description of the drawings]

FIG. 1 is a plan view of an essential part for explaining one embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken on line II-II in FIG.

FIG. 3 is a diagram showing a conventional example corresponding to FIG. 2;

[Description of Signs] 2 Fixed plate 2A Mold mounting surface 4 Movable plate 4A Mold mounting surface 8 Mold 9A Fixed type mounting plate 10A Movable mounting plate 11 Guide roller 11A Circular outer peripheral portion 11B Base portion 11C Collar portion 12 Shaft 12A Head 13 Concave part 15 Bearing 17 Coil spring (elastic biasing member) 21 Receiving roller 22 Shaft 23 Bearing

Claims (1)

(57) [Claims] 1. A circular outer peripheral portion having a predetermined width to which the lower surface of a fixed die mounting plate can be brought into contact with a fixed lower portion of a fixed platen, and both end edges of the circular outer peripheral portion as base portions. A guide roller having a flange portion having a predetermined inclination angle toward the movable platen is always subjected to a resilient urging force from the fixed platen toward the movable platen by the resilient urging member, and the mold of the fixed platen is formed. It is rotatable in the direction parallel to the mounting surface, and when the base portion of the flange portion on the fixed platen moves between a position outside the mold mounting surface of the fixed plate by a predetermined distance and a position retracted and retracted inside. A plurality of bearings are movably supported via a bearing having a friction coefficient of μf between the shaft and a predetermined position at a lower portion of the movable platen.
The movable platen has a predetermined width with which the lower surface of the movable mounting plate of the mold can abut, and the friction coefficient μv between the lower surface of the movable mounting plate and the friction coefficient μf is larger than the friction coefficient μf. An injection molding machine equipped with a mold loading / unloading guide mechanism, which is rotatably provided in a direction parallel to the mold mounting surface and is provided at a plurality of positions so as to be axially supported while not allowing movement in the axial direction.