JPH0639960Y2 - Mold clamping device such as injection molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a mold clamping device such as an injection molding machine equipped with a support device for supporting the weight of a movable mold plate and a mold fixed to the movable mold plate. It is about.

(Prior Art) FIGS. 7 and 8 show a mold clamping device of a conventional injection molding machine. Generally, when a very heavy die is used or the opening / closing stroke of the die 14 is long, the movable die platen 2 is guided by the weight of the movable die platen 2 or the die 14 fixed to the die die plate. There is a problem that the tie bar 3 is largely bent, the cores of the core mold 12 and the cavity mold 13 of the mold 14 are misaligned, and the bush 4 of the movable mold plate 2 is worn in a short period of time. In order to avoid this, conventionally, a sliding block 1 or a rolling block (not shown) is provided between the movable mold platen 2 and the mold clamping device base plate 10.

FIGS. 7 and 8 show an example in which the sliding block 1 disclosed in Japanese Utility Model Publication No. 63-37225 is used, and shows the lower main part of the movable mold platen 2 and the whole mold clamping device. In FIG. 8, the tie bar 3 penetrates a bush 4 provided on the movable mold platen 2 to guide the horizontal movement of the movable mold platen 2. An inclined plate 5 is fixed to the lower part of the movable mold plate 2 by a method such as a screw (not shown). A wedge 6 which is a sliding body is in contact with the inclined surface of the inclined plate 5, and the wedge 6 is an adjusting screw. It is attached to the movable mold platen 2 by 7 and a lock nut 8. The wedge 6
Has a sliding piece 9 on its lower surface, and usually two pieces are mounted on the movable mold platen 2 as a set. In addition, on the lower surface of the sliding piece 9, there is a strip steel 11 stretched by applying tension to the upper surface of the base 10, but this is abolished and the sliding surface is directly processed on the upper surface of the base 10. Sometimes.

(Problems to be Solved by the Invention) In such a structure, the total weight of the movable mold platen 2 and the mold 14 fixed to the movable mold platen 2 is supported by the base plate 10 via the wedges 6. Therefore, there is little deviation of the core of the mold 14, and the tie bar 3
There is also no wear of the bush 4. However, since a heavy load is applied, it is necessary to use an expensive material having high wear resistance for the sliding piece 9, which increases the manufacturing cost of the supporting device.

According to the present invention, the tie bar is allowed to bend due to the weight of the movable mold platen or the weight of a mold or the like fixed to the movable mold platen, and the cost is reduced in terms of the material of the supporting device as a compensation. Reduce the amount of wear of the sliding pieces used in the support device,
The purpose is to reduce maintenance costs.

(Means for Solving the Problem) Therefore, in the present invention, the fixed mold plate and the mold clamping cylinder, or the toggle end plate are connected by two or more tie bars,
For supporting a movable mold plate that slides on a sliding surface provided in parallel with the tie bar in a mold clamping device that slides the movable mold plate in a substantially horizontal direction with a tie bar as a guide with respect to the fixed mold plate cylinder. The block and the movable mold plate are provided so as to be vertically movable in the vertical direction and separated from each other by a gap δ corresponding to the amount of eccentricity allowed in the mold, and are guided by the movable mold plate in the sliding direction. The present invention comprises a movable mold plate support device which is movably connected to the moving surface, and is used as a means for solving the problem.

(Operation) A guide bar (pin) is projected from the lower surface of the movable mold plate in a substantially vertical direction, and can be moved vertically along the guide bar, and the guide bar allows the movable mold plate to move on the base plate together with the movable mold plate. Fit the block for supporting the movable mold plate that slides horizontally. A predetermined amount of gap is provided between the sliding block and the lower surface of the movable mold plate. Here, when the movable platen moves horizontally,
The projecting guide bar pulls and moves the entire movable platen support device.

In a movable mold platen support device having a gap between the lower surface of the movable mold platen and the sliding block, which is allowed for misalignment of the mold, the movable mold platen has a tie bar larger than this allowable value. It does not bend. That is, even if the movable mold platen comes to a position where the bending exceeds the allowable value, the lower surface of the movable mold platen comes into contact with the sliding block, which reduces the load of the bush as much as the sliding block takes charge. Become.

Further, the load applied to the sliding piece on the lower surface of the sliding block is not the total weight of the movable mold plate, but a part thereof is reduced by the spring force due to the bending of the tie bar. As described above, since the bush and the sliding piece share the load with each other, the wear rate is also slowed.

(Embodiment) The present invention will be described below with reference to embodiments of the drawings, and FIGS. 1 to 6 show an embodiment of the present invention. In addition, the first of FIG.
The difference between the embodiment and the second embodiment shown in FIG. 6 is that the sliding piece 9 is used for supporting in FIG. 1, while the rolling bearing 17 is used in FIG.
All are the same except that they are supported by the rolling block 17 having a and the like. Further, in the figure, 2 is a movable die plate, 3 is a tie bar, 4 is a bush, 10 is a base plate, and 14 is a mold, and these are the same as the conventional ones shown in FIGS. 7 and 8.

1 to 5, the difference from the conventional one will be described. In FIG. 1, a movable mold platen is formed by connecting a fixed mold platen 21 and a mold clamping cylinder or toggle end plate with two or more tie bars 3. In a mold clamping device in which a mold opening / closing cylinder 22 slides in a substantially horizontal direction with a tie bar 3 as a guide with respect to a fixed mold plate 21, a support device 18 is provided on the lower surface of the movable mold plate 2, Movable platen 2 when 14 is open
Is shown by a solid line, and the movable mold platen 2 when the mold 14 is closed is shown by a chain double-dashed line.

The mounting state of the supporting device 18 on the movable mold plate 2 is shown in FIGS.
It is shown in detail in the figures, in which the mold 14 is shown in the open and in the closed state.

First, FIGS. 2 and 3 show a state in which the mold 14 is opened, and a guide bar (pin) 15 is driven into the mounting portion of the support device 18 on the lower surface of the movable mold plate 2 in a substantially vertical direction. The remaining portion of the movable platen 2 that is fixed by the support device 18 is
It is slidable against. The supporting device 18 is composed of a sliding block 16, a guide bar retainer 19 and a sliding piece 9. The sliding piece 9 is fixed to the sliding block 16 by fastening means (not shown). It is fixed laterally to the sliding block 16 by two screws 20. In addition, guide bar presser
19 is provided so that the sliding block 16 can be pulled out in the lateral direction by removing the two screws 20 when the supporting device 18 is to be removed from the movable mold plate 2. Therefore, maintenance and inspection are easy. The purpose is to

A bush 4 is driven into the movable mold platen 2, and the movable mold platen 2 is guided by the tie bar 3 through the bush 4 so that the movable mold platen 2 can move in the horizontal direction. Furthermore, between the lower surface of the movable mold platen 2 and the upper surface of the sliding block 16, as shown in FIG.

The guide bar (pin) 15 is designed to enter the space formed by the sliding block 16 and the guide bar retainer 19, and when the movable mold platen 2 moves in the horizontal direction, it is supported by the protruding guide bar (pin) 15. The whole 18 is pulled so that it can move. When the movable die plate 2 moves to the position indicated by the chain double-dashed line, the tie bar 3 bends downward, and the movable die plate 2 also descends. The guide rod (pin) 15 can also descend in the space.

Further, in FIGS. 4 and 5, the sliding block 16 and the movable mold platen 2 are shown.
The gap with is gone. This is because the tie bar 3 is bent due to the weight of the movable die plate 2, but this bending does not exceed δ.

(Effects of the Invention) The present invention is configured as described above in detail, and the weight of the movable mold platen and the mold fixed to the mold platen is shared by the tie bar and the movable mold platen support device. Therefore, it is possible to slow down the degree of progress of wear of the sliding pieces of the supporting device, which can reduce the cost of maintenance and inspection. Moreover, since the load on the sliding piece can be reduced, an inexpensive material having a low load capacity can be used.

[Brief description of drawings]

FIG. 1 is a front view of a mold clamping device equipped with a mold plate support device showing an embodiment of the present invention, FIG. 2 is a detailed sectional view of a B portion of FIG. 1, and FIG. 3 is a side sectional view of FIG. FIG. 4 is a detailed sectional view of a portion C of FIG. 1, FIG. 5 is a side sectional view of FIG. 3, and FIG. 6 is a front sectional view of a movable platen supporting device showing another embodiment of the present invention. FIG. 7 is a front view of a mold clamping device equipped with a conventional mold plate supporting device, and FIG.
The drawing is a detailed cross-sectional view of the portion A in FIG. Description of main parts of the figure 2 ... Movable platen, 3 ... Tie bar 4 ... Bushing, 9 ... Sliding piece 10 ... Stand, 14 ... Mold 15 ... Guide rod (pin), 16 ... … Sliding block 17 …… Rolling block, 18 …… Supporting device 19 …… Guide bar retainer, 21 …… Fixed block

Claims (1)

[Scope of utility model registration request] 1. A fixed mold plate and a mold clamping cylinder, or toggle end plates are connected by two or more tie bars, a movable mold plate is a cylinder for opening and closing a mold, and the tie bar is a guide to the fixed mold plate in a substantially horizontal direction. In the mold clamping device that slides on the mold, the movable mold plate supporting block that slides on the sliding surface provided in parallel with the tie bar and the movable mold plate are allowed to move vertically in the mold. A movable mold platen support device which is provided with a gap δ corresponding to the amount of eccentricity and is coupled so as to be guided to the movable mold platen in the sliding direction so as to move the sliding surface. A mold clamping device such as an injection molding machine.