JP3935461B2 - Vertical injection molding machine - Google Patents

Description

  The present invention relates to a vertical injection molding machine, and more particularly, a slide plate that slides in a horizontal direction when a mold is placed on a vertical injection molding machine and when a molded product is taken out or when the mold is replaced. It relates to the improvement of the mechanism.

Conventionally, in a vertical injection molding machine, one mold is attached to the fixed platen side, the other mold is attached to the movable platen side, and the mold attached to the movable platen side is matched with the fixed platen side, for example, The mold was clamped by increasing the pressure, and then the desired molten material was filled into the mold cavity from the injection device to form a molded product having a desired shape.
The vertical injection molding machine requires about half the installation area of the horizontal injection molding machine, and the productivity per floor area is approximately doubled. In addition, since the mold weight is supported by a horizontal mold plate and the mold is clamped and opened, the mold can be tilted forward by the weight of the horizontal mold when the mold is opened and closed. Has advantages.

In the case of such a vertical injection molding machine, it is known to employ a mechanism that slides the mold forward in consideration of convenience when taking out the molded product, exchanging the mold, and washing the mold. For example, there is one provided with a slide plate that can slide back and forth horizontally on a movable platen.
Conventionally, such a slide plate is generally applied with a lubricant such as grease between the slide plate and the movable platen, and the slide plate is slid directly on the movable platen (hereinafter referred to as this platen). The seed type is also called the direct sliding type.)

However, in such a type in which the slide plate slides directly on the movable plate, the metals slide in contact with each other. Therefore, foreign matter (dust, dust, etc.) on the sliding surface (the back surface of the slide surface and the surface of the movable plate). Etc.) may be galling. In addition, wear is caused by long-term use.
In such a vertical injection molding machine, by raising the movable platen, the mold attached to the movable platen side is raised toward the mold on the fixed platen side, and the molds are aligned and added together. Although pressure (clamping) is performed, the parallelism when the pressure is applied is important.
In other words, since the slide plate exists between the movable plate and the mold that are lifted when the mold clamping pressure is increased, the sliding surface of the slide plate and the movable plate is galvanized and wears. There is a risk that the parallelism of pressure during mold clamping pressure increase is lost.
In particular, when the grease as the lubricant is reduced by the frequency of use, the movable plate and the slide plate are conspicuously worn and damaged, and there is a possibility that the expensive movable plate and slide plate may be replaced.
In order to solve the above-mentioned problem in such a direct sliding type, it is necessary to select an expensive material in order to prevent galling of both the movable plate and the slide plate, resulting in an increase in the cost of the entire injection molding machine.
Furthermore, since the entire area of the movable platen surface and the back surface of the slide plate slides in contact with each other, the contact area is large and the sliding resistance is large.

Therefore, as shown in FIG. 6, when the slide plate 100 is slid, a gap L is formed between the back surface 101 of the slide plate 100 and the front surface 201 of the movable platen 200. A slider that avoids contact sliding between the slide plate 100 and the movable platen 200 using a linear guide 300 including a (slider) 301 and a guide rail 302 that slide-guides the bearing 301 is known.
Specifically, bearings (sliders) 301 are fixed to both ends of the back surface 101 of the slide plate 100, and guide rails 302 are fixed to both ends of the surface 201 of the movable platen 200 facing each other. Accordingly, the slide plate 100 can be slid in the horizontal direction (front-rear direction of the apparatus). A coil spring 400 biased in the vertical direction of the apparatus is interposed between the bearing 301 and the slide plate back surface 101, and resists the spring force during pressurization (clamping operation). When the slide plate 100 and the movable plate 200 come into contact with each other and no pressure is applied (when the slide plate 100 moves in the horizontal direction), the slide plate 100 is pushed up by a spring force, and a gap L is formed between the slide plate 100 and the movable plate 200. Therefore, the slide plate 100 can float and move horizontally above the movable platen 200 in a non-contact state (Non-Patent Document 1).
Mitomo Industry Co., Ltd. “Rubber Injection Molding Machine (STI)” [onlin] “Search September 12, 2003” Internet [URL: http://www.sanyu-group.com/industry/index_j.htm]

  However, as described above, the vertical injection molding machine in which the linear guide 300 is incorporated in the sliding operation of the slide plate 100 has the following problems.

(1) In a vertical injection molding machine that molds a molded product made of rubber or a thermosetting resin, a hot platen 500 is set on the mold installation surface in order to heat the mold. A heat insulating plate 600 is interposed between the heat platen 500 and the slide plate 100 to prevent heat from being transmitted. However, even if the heat at the time of molding is through the heat insulating plate 600, the heat platen 500 starts to 100. Heat of not less than 0 ° C. is transmitted to the slide plate 100.
Thus, when heat is transmitted to the slide plate 100, the slide plate 100 may thermally expand.
However, in the pair of linear guides 300 incorporated between the back surface 101 of the slide plate 100 and the front surface 201 of the movable platen 200, the respective bearings 301 are fixed to both sides of the back surface 101 of the slide plate 100, and the respective guide rails 302 are provided. Is fixed to both sides of the movable platen surface 201, and there is no escape due to the thermal expansion of the slide plate 100. Therefore, the thermally expanded portion appears in the form of deformation of the slide plate 100, and the deformation of the slide plate 100 may cause galling with the movable platen 200. For this reason, there is a problem that accurate mold matching cannot be performed, and this causes the occurrence of burrs and the like.
(2) Since the linear guide 300 is incorporated, the central portion of the movable platen 200 must be raised in a convex shape by the height H, which increases the overall height of the injection molding machine. Originally, the vertical type injection molding machine has a high machine height and requires an installation space in the height direction, but the installation space in the height direction becomes severe due to the increase in height. Moreover, the above-mentioned convex part must be formed in the movable board 200, and it is considered that the cost rises.
(3) The cost of parts of the linear guide 300 itself is high, which increases the cost of the entire injection molding machine.

  The present invention has been made in view of such problems of the prior art, and the object of the present invention is to reduce the overall height of the injection molding machine while having the same sliding operation of the slide plate as in the prior art. It is an object of the present invention to provide a vertical injection molding machine that can perform accurate mold matching without change and is inexpensive.

A first aspect of the present invention that achieves the above object is a vertical injection molding machine that includes a slide plate that places a mold and slides horizontally on a movable platen or a fixed platen when no pressure is applied. Because
The slide plate includes an oil-free bearing that can slide in the horizontal direction on the movable platen or fixed platen, on the back surface facing the movable platen or fixed platen,
Between the back surface and the oil-free bearing, when compressed, the slide plate is compressed against its elasticity and the back surface of the slide plate abuts against the movable platen or fixed plate. When no pressure is applied, the slide plate is lifted by the elasticity. A vertical injection molding machine comprising an elastic member that forms a gap between the movable platen and the fixed platen.

  According to a second aspect of the present invention, in the first aspect of the present invention, a recess is provided on each side of the slide plate on the back side of the slide plate, and the recess is provided with an oil-free bearing and an elastic member. Alternatively, the elastic member is sandwiched between the anti-sliding surface of the oil-free bearing and the upper surface on the inner side of the recess while being fixed in the recess so as to face the surface of the fixed platen.

  A third invention is characterized in that, in any one of the first and second inventions, a plurality of oil-free bearings are provided dispersed on the back surface of the slide plate.

  A fourth invention is the oilless plate according to any one of the first to third inventions, wherein the oil-free bearing is fixed to the back surface of the slide plate by bringing the sliding surface into contact with the movable platen or the fixed platen. It is characterized by.

According to the present invention, an oil-free bearing is provided on the back surface of the slide plate, and the bearing only slides on the movable platen or the fixed platen. Therefore, heat from the heat plate is transmitted to the slide plate, and the slide plate is Even if it thermally expands, the escape of the thermally expanded slide plate is secured. Therefore, the conventional problem that the slide plate is deformed and galling occurs with the movable plate is also solved. Furthermore, since the problem of galling is solved, accurate mold alignment can be performed without any problems, and burrs and the like are eliminated.
Further, since the sliding contact portion is a narrow range of only the oil-free bearing portion sliding on the movable platen or fixed platen, the sliding resistance is extremely small.

Conventionally, the height of the entire injection molding machine has been increased by incorporating the linear guide, and the installation space restriction in the height direction has become stricter. The height is not different from the conventional direct sliding type, and there is no problem with the installation space limitation in the height direction.
Further, by partially disposing the oil-free bearing, the cost of the entire injection molding machine can be prevented from increasing.

  Hereinafter, an embodiment of the present invention will be described. Note that the embodiment described below is merely one embodiment of the present invention, and the present invention is not construed as being limited thereto. The design can be changed as appropriate within the scope of the present invention.

As shown in FIG. 1, a vertical injection molding machine A according to the present invention is provided with a stationary platen 1 to which one mold is attached, and opposed to the stationary platen 1, and is attached with the other die. A movable platen 2 which can be clamped by moving in the vertical direction (vertical direction), a slide plate 3 which is arranged on the movable platen 2 and can be moved in the horizontal direction (front-rear direction), and on the slide plate 3 A heat insulating plate 11 disposed on the movable platen 2 side, a heat platen 12 for heating the mold disposed on the movable platen 2 side, and a contact plate 13 disposed between the heat insulating plate 11 and the heat platen 12. Along with each component, the small mold of the upper mold plate fixed and lower mold plate movable mold clamping system composed of injection device (not shown), mold (upper mold / lower mold), mold clamping mechanism etc. An example of a vertical injection molding machine is shown.
Needless to say, the vertical injection molding machine to which the present invention can be applied is not limited to a small one as in the present embodiment, but can also be applied to medium-sized and large-sized injection molding machines.
The present invention can also be applied to a lower mold plate fixing and upper mold plate movable clamping method in which the lower plate is a fixed plate and the upper plate is a movable plate and the movable plate is lowered and clamped. In this case, a slide plate is disposed on the stationary platen.
Since the present invention has a feature in the slide plate configuration in such a vertical injection molding machine, only the description of this slide plate configuration will be given below, and there is no particular limitation on other machine configurations. Description is omitted.

As shown in FIG. 1, the slide plate 3 is provided on the surface 2a of the movable platen 2 along the diver 14 erected at the four corners and arranged to be vertically moved by a mold clamping mechanism (not shown). The plate portion 4 having a desired shape, an oilless bearing 6 attached to the back surface 4a of the plate portion 4, and an elastic member 8 disposed between the oilless bearing 6 and the plate portion back surface 4a. Yes.
The slide plate 3 is configured such that a horizontal (front / rear) slide mechanism 9 such as a hydraulic cylinder shown in FIG. 3 is connected to the rear end 4b of the plate portion, and is slidable in the front / rear direction by the horizontal slide mechanism 9. Yes. The horizontal slide mechanism 9 is not limited to the illustrated example, and the design can be changed within the scope of the present invention.
1 are guide members provided in the entire slide area on both the left and right sides of the slide plate 3 in the sliding direction. The guide member 15 is made of a material having good slidability or a surface treatment, or a sliding mechanism provided with a plurality of rolling elements (balls, rollers, etc.) on the surface facing the side surface of the slide plate 3 so as to be freely rollable. It is preferable to employ one having

  The oil-free bearing 6 is a sliding bearing that can be used without oil that exhibits wear resistance and seizure resistance. For example, the sliding surface 6a is a sintered layer, and a solid lubricant is dispersed and sintered in a special copper alloy. Furthermore, solid lubrication is applied to the desired location of the sliding surface of the desired oil-impregnated plate (for example, a sintered plate such as Oiles # 2000 manufactured by Oiles Kogyo Co., Ltd.) or a plate member made of cast iron or high strength brass alloy. Plate (eg, OILES # 500F made by OILES Co., Ltd.), high strength brass type such as OILES # 500SP Examples include oilless plates such as plates, oilless wear plates, etc., but are not particularly limited and are subject to various conditions such as allowable load and use limit temperature. It shall be selected within the scope of the present invention.

In this embodiment, as shown in FIG. 1 to FIG. 4, recesses 5 are provided at four locations on the both sides in the sliding direction (two locations on one side) of the back surface 4 a of the plate portion 4, respectively. A thin and thin plate-like oil-free bearing 6 is suspended and supported via front and rear bolts 10. The oil-free bearing 6 is fixed in the recess 5 with its sliding surface 6 a facing the surface 2 a of the movable plate 2. ing.
The illustrated oil-free bearing 6 in the form of a plate is merely an example, and the overall shape, length, thickness, width, and the like can be changed depending on the size of the plate portion 4, the allowable load, and the like.
Further, in this embodiment, as described above, according to a small vertical injection molding machine, each of the four recesses 5 on the back surface 4a of the plate portion is provided. For example, in a medium vertical injection molding machine Is preferably provided at a total of six locations on three sides, and the number of arrangements can be changed as appropriate according to the size of the target vertical injection molding machine.

In the present embodiment, for example, as shown in FIG. 2, the elastic member 8 is configured by overlapping three disc springs, and through which the front and rear bolts 10 for fixing the plate portion are inserted, the anti-sliding bearing 6 is rubbed. It is sandwiched between the abutting member 7 provided on the moving surface 6 b and the concave inner surface 5 a of the plate portion 4.
When the pressure is applied (when the mold is clamped), the oil-free bearing 6 is pushed into the recess 5 against the spring force, and the elastic member 8 is not pressed (when the slide plate 3 is slid. In other than tightening, the oil-free bearing 6 slightly protrudes from the back surface (movable plate contact surface) 4a of the plate portion 4 even when a load is applied to the mold, the hot platen 12, the plate portion 4, etc. It is assumed that the spring force is such that 4a can be kept floating from the movable platen surface 2a.
Although the present embodiment has been described with a plurality of disc springs, the elastic member 8 is not limited to this, and is compressed against its elasticity when pressed during mold clamping, such as a compression spring. When no pressure is applied, the oil-free bearing 6 slightly protrudes from the back surface (movable plate contact surface) 4a of the plate portion 4 and can maintain the plate portion back surface 4a floating from the movable plate surface 2a. A rubber material having a certain degree of elasticity may be used and is arbitrary.

According to the vertical injection molding machine of the present embodiment, first, one mold (not shown) is mounted on the heating platen 12 on the movable platen 2 side, and the other mold is mounted on the fixed platen 1 side and set. Thereafter, the mold clamping mechanism is operated to raise the movable platen 2. As the movable platen 2 rises, the slide plate 3, the heat insulating plate 11, the contact plate 13, the heating platen 12 and the mold (not shown) are directed toward the mold (not shown) attached to the fixed platen 1 side. Rise together.
In this state, since it is still in a non-pressurized state, as shown in FIGS. 1 to 4, a load such as a mold is applied to the elastic member 8, but a pressing force is applied during mold clamping. Therefore, a clearance L as shown is formed between the back surface (movable plate contact surface) 4a of the plate portion 4 of the slide plate 3 and the movable plate surface 2a so as to float from the movable plate surface 2a.
When the mold on the movable platen 2 side is combined with the mold on the fixed platen 1 side and pressurized by the mold clamping mechanism, the oilless bearing 6 is pushed up by the movable platen surface 2a, and the elastic member 8 is moved by the pressure. Compressed against elasticity, the movable platen surface 2a comes into contact with the back surface (movable platen contact surface) 4a of the plate part 4. That is, the clearance L described above is eliminated.
The molten mold cavity is filled with a molten material, and after molding, the mold clamping mechanism is lowered to open the mold.

Then, when the molding process is completed and the molded product is removed, the slide plate 3 is slid forward through the horizontal slide mechanism 9.
At this time, the back surface (movable plate contact surface) 4a of the plate portion 4 of the slide plate 3 returns to a state where the elastic member 8 compressed against the elasticity at the time of pressurization is not applied with a compressive force. A desired clearance L is formed by floating from the surface 2a.
Accordingly, the oil-free bearing 6 can slide on the movable plate 2 in such a state that the back surface (movable plate contact surface) 4a of the slide plate 3 is lifted from the movable plate surface 2a.
Thus, the sliding contact between the sliding plate 3 and the movable platen 2 is eliminated during the sliding operation of the sliding plate 3, and only the sliding surface 6a of the oil-free bearing 6 is in sliding contact with the movable platen 2.

  In this embodiment, the vertical injection molding machine A according to the first embodiment is an example in which the air blowing portion 16 is provided with the blowing port 16a facing the plate portion rear surface 4a side of the slide plate 3. Since the present embodiment is the same as the first embodiment except that the air blowing portion 16 is provided, the description other than the air blowing portion 16 is omitted.

  As shown in FIG. 5, in this embodiment, the air blowing portions 16 are provided at three locations on the back surface 4a side near the plate portion rear end 4b with a space from the adjacent blowing ports 16a. It is configured to blow out air having a desired blowing pressure from 16a. The air supply mechanism is not particularly limited and can be arbitrarily selected. FIG. 5A is a schematic plan view partially showing a state in which the slide plate 3 slides on the movable platen 2, and FIG. 5B is a schematic side view showing a partial cross section.

Such an air blowing portion 16 is configured such that when the slide plate 3 is slid forward (the two-dot chain line in FIG. 5 indicates the slide plate 3 slid in the left direction in the drawing), the movable platen surface 2a is Since it may be exposed and dust, dust, etc. may adhere to the movable platen surface 2a, foreign matter such as dust, dust, etc. adhering to the movable platen surface 2a is removed from the movable platen surface 2a by air blowing pressure. Have the role of That is, when the slide plate 3 slides forward and the slide plate 3 slides again on the movable platen surface 2a after cleaning the mold or replacing the die, foreign matter such as dust or dust on the movable platen surface 2a. If the material remains attached, these foreign substances may invade between the plate part back surface 4a of the slide plate 3 and the movable platen surface 2a to cause galling or the like. Therefore, when the slide plate 3 returns to the movable platen surface 2a, it is possible to eliminate foreign matters and prevent galling by sliding while blowing air of a desired pressure from the air blowing portion 16 to the movable platen surface 2a. I can do it.
The air blowing portion 16 may be provided at least at one place on the plate portion back surface 4a of the slide plate 3. However, the present invention is not limited to this, and a configuration in which the air blowing portion is provided on the front surface 2a of the movable platen 2 is described. It is also possible to adopt within the range. Further, it is possible to adopt a configuration in which an air blowing portion is provided on both the plate portion back surface 4a of the slide plate 3 and the front surface 2a of the movable platen 2.

The front view of the non-pressurization state which shows a part of this invention vertical injection apparatus. The enlarged view which expands and shows the principal part of FIG. The side view of the injection molding machine of FIG. The enlarged view which expands and shows the principal part of FIG. FIG. 6 is a plan view schematically showing the second embodiment, where (a) is a schematic plan view showing a part of a slide plate slidingly on a movable plate, and (b) is a schematic side view showing a part of a cross section. . The expanded sectional view which shows the conventional slide apparatus part.

Explanation of symbols

A Vertical injection molding machine 1 Fixed platen 2 Movable platen 3 Slide plate 4 Plate part 4a Back surface 5 Recess 6 Oil-free bearing (oilless plate)
8 Elastic member 11 Heat insulation board 12 Heating board

Claims (4)

A vertical injection molding machine having a slide plate that places a mold and slides horizontally on a movable platen or a fixed platen when no pressure is applied,
The slide plate includes an oil-free bearing that can slide in the horizontal direction on the movable platen or fixed platen, on the back surface facing the movable platen or fixed platen,
Between the back surface and the oil-free bearing, when compressed, the slide plate is compressed against its elasticity and the back surface of the slide plate abuts against the movable platen or fixed plate. When no pressure is applied, the slide plate is lifted by the elasticity. A vertical injection molding machine comprising an elastic member that forms a gap between the movable platen and the fixed platen .   Concave portions are provided on both sides in the sliding direction on the back of the slide plate, and oil-free bearings and elastic members are provided in the concave portions. The oil-free bearings are located in the concave portions with their sliding surfaces facing the surface of the movable platen or fixed platen. 2. The vertical injection molding machine according to claim 1, wherein the elastic member is clamped between the anti-sliding surface of the oil-free bearing and the upper surface of the concave portion while being fixed.   The vertical injection molding machine according to claim 1, wherein a plurality of oil-free bearings are provided dispersed on the back surface of the slide plate. The vertical injection molding according to any one of claims 1 to 3, wherein the oil-free bearing is an oilless plate that is fixed to the back surface of the slide plate with the sliding surface in contact with the movable platen or fixed platen. Machine.

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