JP2007301783A - Injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a movable platen guide device for the purpose of improving the parallelism of the movable platen and fixed platen of an injection molding machine. <P>SOLUTION: In the injection molding machine 11 wherein the movable platen 17 is attached to the tie bar 16, which is arranged between the fixed platen 14 and a pressure receiving platen 15, in a freely movable manner, the movable platen guide device 22 for guiding the movable platen 17 in a direct-acting state is arranged between the part other than the upper surface of a bed 13 and the movable platen 17 separately from the tie bar 16, and the movable platen 17 is made movable in the state in which the improved parallelism to the fixed platen 14 is held. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to an injection molding machine, and more particularly to a movable plate guide device that is disposed in a mold clamping device of an injection molding machine and guides a movable plate linearly.

In the movable platen of the injection molding machine, a bush having a lubricant sealed therein is inserted into holes near the four corners, and a tie bar is slidably inserted into the bush. However, there is a slight clearance between the bush and the tie bar, which may cause a problem of parallelism between the movable platen and the fixed platen. There is also a problem that a load is applied to the tie bar downward due to the weight of the movable platen or movable mold. Therefore, as an injection molding machine corresponding to the above problem, the one shown in Patent Document 1 is known. In Patent Document 1, a linear guide device is disposed on the upper surface of the bed, and the lower surface of the movable plate is movably guided and held. However, this method requires that the dimensional accuracy of the bed upper surface, fixed platen, and movable platen be very accurate. And although the bed is generally made of steel plate, there is a problem that there is a slight warp on the bed upper surface made of steel plate, and it is very difficult to install the linear guide device completely parallel to the tie bar. was there. Therefore, in Patent Document 1, it is difficult to improve the parallelism between the movable platen and the fixed platen. In Patent Document 1, the bed below the moving part of the movable platen is usually not attached with a steel plate in order to pass the temperature control hose for temperature control of the mold. It is difficult to install the device.

Japanese Patent Laid-Open No. 9-262884 (Claim 1, FIG. 1, FIG. 3)

The present invention has been made in view of the above problems, and an object of the present invention is to provide a movable plate guide device for increasing the parallelism between a movable plate and a fixed plate of an injection molding machine. And in a horizontal injection molding machine, it aims at providing the movable board guide apparatus aiming at reducing the downward load concerning a tie bar. It is another object of the present invention to provide a movable plate guide device that can be easily and accurately attached later.

An injection molding machine according to claim 1 of the present invention is an injection molding machine in which a movable plate is movably attached to a tie bar disposed between a fixed plate and a pressure receiving plate, In addition to the tie bar, a movable plate guide device that guides the movable plate linearly is provided between the movable plate and the movable plate.

An injection molding machine according to claim 2 of the present invention is an injection molding machine in which a movable plate is movably attached to a tie bar disposed between a fixed platen and a pressure receiving plate. A mounting member mounted between the panels and between the movable plate and the pressure receiving plate, a horizontal member coupled between the mounting members and disposed in parallel to the tie bar, and a horizontal member and the movable plate. A movable plate guide device provided with a linear motion guide member that is disposed between and linearly guides the movable plate is provided.

The injection molding machine according to claim 3 of the present invention is the injection molding machine according to claim 2, wherein the housing of the linear motion guide member is disposed on the lower surface of the movable platen, and the housing of the linear motion guide member is disposed on the upper surface of the horizontal member. A rail is provided, and the horizontal member is provided in non-contact with the bed upper surface.

The injection molding machine of the present invention is an injection molding machine in which a movable plate is movably attached to a tie bar disposed between a fixed plate and a pressure receiving plate, and between the portion other than the upper surface of the bed and the movable plate. In addition to the tie bar, a movable plate guide device that linearly guides the movable plate is provided, so that the parallelism between the movable plate and the fixed plate can be increased, and thus the dimensional accuracy of the molded product can be improved. it can.

An injection molding machine according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a front view of an injection molding machine provided with the movable plate guide device of the present embodiment. 2 is a cross-sectional view taken along line AA in FIG. 3 is a cross-sectional view taken along line BB in FIG.

As shown in FIG. 1, in the mold clamping device 12 of the injection molding machine 11, a fixed platen 14 is erected and fixed on the upper surface of the substantially center of a bed 13. A pressure receiving plate 15 is disposed on the upper surface near one side of the bed 13 so as to face the fixed plate 14, and two upper and two lower tie bars 16 are provided between the fixed plate 14 and the pressure receiving plate 15. They are arranged in parallel and at equal intervals. Further, holes 17a are provided in the vicinity of the four corners of the movable platen 17, and bushes 17b in which a lubricant is sealed are inserted into the holes 17a. The tie bar 16 is inserted into the bush 17b of the movable platen 17, and both are slidable by a lubricating action. The bed 13 in the lower part of the position where the movable platen 17 is moved to open and close the mold is provided with an opening 13a at the center, and a temperature control hose (not shown) can be attached to the mold.

The pressure receiving plate 15 is provided with a mold clamping cylinder 18 which is a mold clamping drive mechanism, and a rod 18 a is fixed to the movable plate 17. The mold clamping mechanism may be an electric toggle system, a mold clamping servo motor may be provided on the pressure receiving plate, and a toggle mechanism may be provided between the pressure receiving plate and the movable plate. When the fixed mold 19 is mounted on the mold mounting surface 14a of the fixed platen 14, the movable mold 20 is mounted on the mold mounting surface 17c of the movable platen 17, and both the molds 19 and 20 are closed. A cavity not shown in the figure is formed. An injection device 21 is disposed on the top surface of the fixed platen 14 on the side opposite to the movable platen side and closer to the other side of the bed 13.

Next, the movable platen guide device 22 will be described. The lower two tie bars 16 are attached with mounting members 23 and 25, a horizontal member 26, a rail 28 of a linear guide way 27, etc., which constitute one of the movable plate guide devices 22 in parallel with the tie bars 16, respectively. ing. Further, a housing 24 of a linear guide way 27 constituting the other side of the movable plate guide device 22 is attached to the movable plate 17. The movable plate guide device 22 is constituted by both. Therefore, as shown in FIGS. 2 and 3, the injection molding machine 11 has two movable plate guide devices 22, 22 attached along the tie bars 16, 16.

The details of the movable platen guide device 22 will be further described. As shown in FIG. 2, the portion between the fixed platen 14 and the movable platen 17 in the lower tie bar 16 is formed on the mold mounting surface 14 a of the fixed platen 14. An attachment member 23 on the fixed platen side (the other side) is provided facing downward so as to substantially abut. The mounting member 23 includes an upper mounting member 23a having a semicircular tie bar abutting surface that follows the peripheral surface of the tie bar 16, and a lower mounting member 23b having a semicircular tie bar abutting surface and having a predetermined length. It is made up of. Then, the side of the tie bar abutting surfaces of the upper mounting member 23a and the lower mounting member 23b is sandwiched with respect to the peripheral surface of the tie bar 16, and engaged and fixed to the tie bar 16 with mounting bolts (not shown). Note that the position at which the fixed plate-side mounting member 23 is attached to the tie bar 16 is not necessarily in contact with the fixed platen 14, but when the movable platen 17 is clamped, the movable platen 17, the movable mold 20, and the temperature control. It is engaged with the hose and the linear guide way 27 and attached to a position where the end of the housing 24 of the movable platen 17 does not get in the way.

A mounting member 25 on the pressure receiving plate side (one side) is provided facing downward at a position near the pressure receiving plate 15 between the pressure receiving plate 15 and the movable plate 17 in the lower tie bar 16. The shape of the attachment member 25 is the same as that of the attachment member 23 on the fixed platen side, so that a cross-sectional view is omitted, but the upper attachment member 25a having a semicircular tie bar contact surface that follows the peripheral surface of the tie bar 16 is also semicircular. The lower mounting member 25b has a predetermined length. The tie bar contact surfaces of the upper mounting member 25a and the lower mounting member 25b are sandwiched between the peripheral surfaces of the tie bar 16, and engaged and fixed to the tie bar 16 with mounting bolts (not shown). The mounting position of the mounting member 25 on the pressure platen side to the tie bar 16 is preferably a position near the pressure platen 15 so that it is fixed to the movable platen 17 and the movable platen 17 when the movable platen 17 is opened. The end portion of the housing 24 and the mold clamping mechanism are attached at positions where they do not get in the way.

Further, as shown in FIG. 1, in the movable plate guide device 22, the horizontal member 26 is parallel to the tie bar 16 (horizontal) so as to connect the lower end of the lower mounting member 23b and the lower end of the lower mounting member 25b. Direction). Therefore, the mounting members 23 and 25 and the horizontal member 26 are fixed at right angles. The horizontal member 26 is a steel material having a plate thickness having a predetermined strength (at least 25 mm or more with an injection molding machine having a mold clamping force of 400 KN), and having an upper surface planarized. Further, adjustment means such as shims can be inserted between the upper mounting members 23a and 25a and the lower mounting members 23b and 25b of the movable plate guide device 22 and between the lower mounting members 23b and 25b and the horizontal member 26. The parallelism between the horizontal member 26 and the tie bar 16 can be finely adjusted. Further, although not shown, a connecting plate may be attached between the horizontal member 26 and the horizontal member 26.

As shown in FIGS. 1 and 3, a linear rail 28 of a linear guide way 27 that is a linear guide member that linearly guides the movable platen 17 is directed on the upper surface of the horizontal member 26 in the mold opening / closing direction. Arranged. The rail 28 is provided at a length and a position where the housing 24 can move to a retreat limit position when the movable platen 17 is opened and a advance limit position when the mold is closed. Since the linear guide way 27 is a known mechanism and will not be described in detail, a groove 28 a is formed on the side surface of the rail 28 so that the ball 24 b disposed on the slider 24 a of the housing 24 contacts. Further, the lower surface of the horizontal member 26 is provided in non-contact with the upper surface of the bed 13. Therefore, even if there is a slight deflection on the upper surface of the bed 13, it is not affected.

Further, a housing 24 of a linear guide way 27 that is a linear guide member that linearly guides the movable platen 17 is inserted into a lower surface 17d that is one side surface of the movable platen 17 so as to correspond to the rails 28 and tie bars 16 and 16 are inserted. Are respectively attached to the lower positions. Sliders 24 a and 24 a having a groove portion with a substantially concave cross section facing downward are attached to the housing 24 along the direction of the rail 28 so as to straddle the rails 28. Balls 24b, which are rolling members, are arranged in a row on the side wall surface in the groove of the slider 24a. The ball 24b is rolled along the groove 28a of the rail 28.

The linear guide member is not limited to the linear guide way 27, and may be an LM guide (registered trademark) having the same structure. The balls 24b that are rolling members may be of a retainer type. Moreover, as a rolling member, the thing using a roller and a wheel may be used. Further, as the linear motion guide member, a rolling member is not used but a low friction material such as a Turkite (registered trademark) plate or an oil lubrication member may be used, and may be configured to slide between these members. . Alternatively, the horizontal member may be a cylindrical member such as a tie bar, and may be inserted into a bush formed on a bracket extending below the movable platen.

Next, the opening / closing movement of the movable platen 17 and the effects of the movable plate guide device 22 will be described. According to the present embodiment, when the movable platen 17 is opened and closed, the tie bar 16 is not only held in a sliding state with respect to the bushes 17b near the four corners of the movable platen 17, but is also a linear motion guide separately from the tie bar 16. The rail 28 and the housing 24 of the linear guide way 27 as members guide the movement of the movable platen 17. Therefore, the movable plate guide device 22 receives part of the weight of the movable plate 17 and the movable mold 20 through the linear guide way 27. Since the movable plate guide device 22 is attached to the fixed plate side (the other side) and the pressure receiving plate side (one side) of the tie bar 16, it is advantageous in terms of stress on the tie bar 16, and the weight of the movable plate 17 etc. Accordingly, the problem that the middle portion of the tie bar 16 is bent downward is also solved. The movable platen 17 is supported by the linear guide way 27 and can be smoothly moved while maintaining a parallel state with respect to the fixed platen 14. Therefore, by using the present invention for a molding method in which injection is performed from an injection apparatus without completely clamping the mold such as injection compression molding or injection press, and the molten resin in the cavity is compressed, the movable mold for the fixed mold 19 is obtained. The parallelism of the mold 20 can be improved, and a molded product with better dimensional accuracy than the conventional one can be formed. And as a kind of molded article, the present invention works effectively in a molded article in which parallelism is strictly required, such as a separator for a fuel cell, a light guide plate, an optical disk, and a lens.

The present invention includes the following application examples. The movable plate guide device may be any device that can be attached to at least one side surface of the movable mold. For example, the movable plate guide device may be attached to the side surface of the movable plate. The movable platen guide device may be attached to an upper tie bar. Further, the other end of the movable plate guide device may be directly fixed to the fixed plate, not the tie bar. Furthermore, a movable plate guide device may be provided in which brackets are provided at two locations on the upper surface of the bed and a horizontal member is provided between the brackets. In that case, the upper surface of the bed is not in direct contact with the horizontal member. Further, the movable plate guide device may be attached in parallel to a tie bar provided in the vertical direction of the vertical injection molding machine. In the case of a vertical injection molding machine, it is preferable to attach the movable plate guide device in at least two opposite directions. In addition to vertical injection molding machines and horizontal injection molding machines, when injection is performed with the nozzle abutting from the parting surface side of the mold, this device is placed on the opposite side to counter the nozzle touch force. It may be provided.

The present invention is not enumerated one by one, but is not limited to the one in the above-described embodiment, and it goes without saying that the present invention is applied to those modified by a person skilled in the art based on the gist of the present invention. It is.

It is a front view of the injection molding machine provided with the movable board guide apparatus of this embodiment. It is sectional drawing of the AA in FIG. It is sectional drawing of the BB line in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Injection molding machine 12 Clamping device 13 Bed 14 Fixed platen 15 Pressure receiving plate 16 Tie bar 17 Movable platen 18 Clamping cylinder 22 Movable platen guide device 23,25 Mounting member 24 Housing 24a Slider 26 Horizontal member 27 Linear guideway 28 Rail

Claims (3)

In an injection molding machine in which a movable plate is movably attached to a tie bar arranged between a fixed plate and a pressure plate,
An injection molding machine characterized in that a movable plate guide device for linearly guiding the movable plate is disposed between the portion other than the upper surface of the bed and the movable plate, in addition to the tie bar. In an injection molding machine in which a movable plate is movably attached to a tie bar arranged between a fixed plate and a pressure plate,
An attachment member attached between the fixed plate and the movable plate and between the movable plate and the pressure receiving plate in the tie bar,
A horizontal member coupled between the mounting members and arranged parallel to the tie bar;
An injection molding machine comprising: a movable plate guide device provided between the horizontal member and the movable plate, and a linear guide member that linearly guides the movable plate. A housing for the linear motion guide member is disposed on the lower surface of the movable platen, and a rail for the linear motion guide member is disposed on the housing on the upper surface of the horizontal member.
The injection molding machine according to claim 2, wherein the horizontal member is provided in non-contact with the upper surface of the bed.

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