JPH022524Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an injection device support structure for supporting the injection device on the fixed platen side in a horizontal mold clamping, vertical casting type injection molding device.

[Conventional technology]

Traditionally, many injection molding machines, such as die casting machines and plastic injection molding machines, had the mold clamping direction and the injection direction in the same direction, but in recent years, injection molding machines such as molds that have been clamped horizontally into the cavity from below have been used. A horizontal clamping, vertical injection type injection molding apparatus for injecting molten metal or resin has been developed by the present applicant, and is disclosed in, for example, Japanese Patent Publication No. 58-55859.

FIG. 5 is a side sectional view of a die casting machine as a conventional injection molding device of this type, taken near the injection device and looking at the stationary platen side. A fixed platen 2 and another fixed platen (not shown) are erected facing each other on a machine base 1 extending toward the machine base 1, and the four corners of these fixed platens are connected by columns 3.
The injection device, designated as a whole by reference numeral 4, includes upper and lower fixed plates 6 and 7 connected by four columns 5, and an injection cylinder 8 is sandwiched between both fixed plates 6 and 7. Fixed. On the fixed plate 6,
A block 10 that supports the casting sleeve 9 is supported via a ram 11 so as to be able to rise and fall freely, and a plunger (not shown) that moves vertically up and down by the hydraulic pressure of the injection cylinder 8 is pivotally supported on the casting sleeve 9. has been done. The entire injection device 4 configured as described above has a pair of support beams 13 attached to the lower end portions of a pair of tie bars 12 fixed to a pair of lower columns and suspended from a nut 1.
4, and the fixed platen 6 is rotatably supported by this support beam 13. On the other hand, a fixed mold 15 and a movable mold are respectively attached to the fixed platen 2 and a movable platen (not shown) on this side thereof, and the movable mold moves together with the movable platen and clamps the mold in the horizontal direction. A cavity and a fixed sleeve are formed on the joint surface between the fixed mold 15 and the fixed mold 15.

After pouring the metal into the casting sleeve 9, the block 10 is raised by the ram 11 and the casting sleeve 9 and the fixed sleeve are joined, and the plunger is raised by the hydraulic pressure of the injection cylinder 8, Casting is performed by injecting the molten metal in the filling sleeve 9 into the cavity via the fixed sleeve.

Such horizontal clamping, vertical injection type injection molding equipment has the advantage that the length of the molten metal in the casting sleeve 9 is short, so the temperature of the molten metal does not drop much, and the contact area between the molten metal and air is small, making it easier to cast. It has many advantages, such as a small amount of cavities caused by the gas in the sleeve 9, and the fact that the injection plunger faces the cavity when filling is completed, so pressure is effectively transmitted. However, there was a problem with the support structure of the injection device 4.

[Problem that the invention attempts to solve]

That is, in the conventional injection molding apparatus, the entire injection apparatus 4 is supported by the tie bar 12 which is fixed at its base end to the column 3 and hangs down.
The column 3 is deflected by the weight of the injection device 4, and when the casting sleeve 9 and the fixed sleeve on the mold 14 side are joined, a gap is created at the joint surface, causing burrs to occur in the cast product or molten metal to spout out. There was a risk that it would happen. In addition, since the mounting portion at the upper end of the tie bar 12 occupies space, the mounting space for the mold becomes narrow, or the tie bar 12
Due to the hanging structure, the width of the machine in the direction shown in the figure becomes wide, which is an obstacle to downsizing the machine.

[Means for solving problems]

In order to solve the above problems, in the present invention, the fixed plate is integrally formed with a vertical member and a horizontal member extending from the lower end toward the movable plate, and the injection device is supported by a support member hanging from the horizontal member. I let it happen.

[Effect]

Because the horizontal member has such rigidity that it does not bend, the sleeves of the mold and the injection device are joined together without any gaps, the upper end of the injection device support member does not occupy space, and the support member The droop interval becomes narrower.

〔Example〕

This embodiment shows an example in which the injection device support structure according to the present invention is implemented in a horizontal mold clamping type and vertical casting type die casting machine. FIG. 1 is a sectional view taken along the line AA in FIG. In the figure, a die casting machine 21 is equipped with a horizontal mold clamping unit 22 and a vertical casting unit 23.
4 is fixed on top. That is, a fixed platen 25 is fixed on the periphery of an opening provided at the rear end of the upper end plane of the machine base 24. This stationary platen 25 is integrally formed in an L-shape with a substantially square vertical member 25a and a horizontal member 25b extending horizontally from the lower end toward a movable platen 28 (described later), and is fixed to the machine base 24. horizontal member 25
b is formed to be slightly narrower than the vertical member 25a. A fixed plate (not shown) is fixed to the other end of the machine base 24 so as to be movable and adjustable, facing a fixed plate 25. The fixed plate 25 and the fixed plate (not shown) are connected to columns fixed with nuts 26. 27 connects the four corners. 28 is fixed plate 25
It is a movable plate fitted on the column 27 facing the fixed plate 25, and is formed to be movable in the direction of distance from and near the fixed plate 25. A toggle mechanism 29 is used to connect it to a mold clamping cylinder on the fixed plate side (not shown). are connected together. 30 is a fixed mold mounted on the fixed plate 25 and whose movement in the vertical direction is regulated by the key 31; 32 is a fixed mold mounted on the movable plate 28 and the key 3
3, which is a movable mold whose movement in the vertical direction is regulated by the dividing surface 34.
It is joined horizontally so that it can be opened and closed. Both molds 30 and 32 have a cavity 35,
A constricted portion 36 below the constricted portion 36 and a vertical hole 37 that opens downward following the constricted portion 36 are provided separated by the dividing surface 34. is fitted. 39 is a product extrusion device that extrudes the cast product from inside the cavity 35.

On the other hand, the vertical casting unit 23 is equipped with four tie rods 40 as supporting members that are screwed into screw holes in the horizontal member 25b of the fixed platen 25 and suspended, and the interval between them is greater than the interval between the columns 27. It is narrowly formed. The tie rod 40 penetrates the machine base 24 and is inserted into a pit 41 under the floor surface, and the four corners of a support beam 42, which is formed in a U-shape in plan view, are fitted into the threaded portion at the lower end of the tie rod 40. It is inserted and fixed with a nut 43. An injection device, generally designated 44, is rotatably supported by a support beam 42. That is, the injection device 44 includes an upper fixed plate 45 and a lower fixed plate 46 that are formed in a rectangular shape.
6 are connected and fixed by inserting four tie rods 47 screwed into the upper fixed plate 45 into holes in the lower fixed plate 46 and screwing nuts 48 into the threaded portions. The upper fixed plate 45 is provided with pins 49 protruding from both sides of the central portion on its longitudinal side, and the pins 49 are fitted into holes provided in the center portions of both legs of the U-shaped support beam 42 and held between the legs. The entire injection device 44 is rotatably supported by the support beam 42. 50 is the upper and lower fixed plate 4
The piston rod 51 extends upwardly through the upper fixed plate 45, and has a plunger 52 at its projecting end. They are connected via a coupling ring 53. 54 is an oil supply port opened in the lower fixed plate 46. Reference numeral 55 is a block supported by fitting a pair of rams 56 installed in the upper fixed platen 45 into ram holes, and the lower end step is engaged with a coupling 53. The block 55 is moved up and down by the pressure oil introduced into the provided cylinder 57 and the lowering of the piston rod 51. A cast sleeve 58 formed in a cylindrical shape and having the same center and diameter as the fixed sleeve 38 is fixed to the upper end of the block 55, and when the piston rod 51 is in the raised position, the block 55 is raised by the hydraulic pressure of the cylinder 57. The casting sleeve 58 and the fixed sleeve 38 are concentrically pressed together, and when the block 55 is lowered, the sleeves 58, 38 are separated. Reference numeral 59 denotes a tilting cylinder fixed to the upper stationary plate 45, and the working end of the piston rod 60 is pivotally connected to the tie rod 47. By retracting the piston rod 60 from the position shown in the figure, the entire injection device 44 is moved to the pin position. 49 as the center, and is configured to be able to pour into the casting sleeve 58.

The operation of the die casting machine configured as above will be explained. As shown in the figure, with the plunger 52 inserted into the casting sleeve 58, the tilting cylinder 59 is operated to tilt the entire injection device 44 around the pin 49, and the casting sleeve 58 is
After pouring the molten metal into 8, the tilting cylinder 59 is operated in the opposite direction to make the injection device 44 stand upright. Next, oil is simultaneously supplied to the cylinder 57 and the injection cylinder 50 to raise the casting sleeve 58 and the plunger 52 as shown in the figure, thereby pressing the casting sleeve 58 against the lower end surface of the fixed sleeve 38. At this time, on the one hand, the toggle mechanism 2 is operated by the mold clamping cylinder.
9 and the movable mold 32 moves via the movable platen 28,
Since both molds 30 and 32 have been clamped,
After the pressing of the casting sleeve 58 is completed, the injection cylinder 5
When the pressure oil is introduced to 0, the plunger 52 rises, and the molten metal is injected into the cavity 34 through the sleeves 58, 38 and the constriction 36. After the injection is completed and the product has finished cooling, the casting sleeve 58 is inserted into the mold 3.
0, 32, operate the mold clamping cylinder to open the mold, and then take out the product from the molds 30, 32 using the product extrusion device 39.
Cycle ends.

FIG. 3 is a vertical sectional view of a die casting machine showing another embodiment of the present invention corresponding to FIG. 1, and FIG. 4 is a BB sectional view of FIG. 3. In this embodiment, the entire vertical casting unit can be moved and adjusted in the horizontal direction. Items with the same reference numerals as in Figs. Omitted. In the figure, the fixed platen 61 designated by the reference numeral 25 in the above embodiment has a vertical member 61a and a horizontal member 61.
The horizontal member 61b is integrally formed in an L-shape with the horizontal member 25b, which is the same as in the previous embodiment, but the horizontal member 61b is formed thicker than the horizontal member 25b and is inserted into the machine base 24. In the groove 61c formed at the lower end of the horizontal member 61b,
A protruding strip 62a of a support plate 62 formed in the shape of a rectangular plate is engaged, so that the support plate 62 is configured to be movable in a direction parallel to the mold clamping direction with respect to the horizontal member 61b. . A tie rod 63, which is shorter than the tie rod 40 of the previous embodiment, is screwed into the support plate 62 and hangs therefrom, and a support beam 42 is supported at the lower end of the tie rod 40. The structure of the support beam 42 and the injection device 44 as a whole, as well as the fact that the injection device 44 as a whole is pivotally supported by the support beam 42 and tilted by a tilting cylinder 59, are the same as in the previous embodiment. A pneumatic cylinder 64 is mounted on the back side of the upper plate of the machine base 24.
is supported via a bracket, and the working end of the piston rod 65 is pivotally connected to one end of the support plate 62. By doing this, when the piston rod 65 is moved forward and backward using pneumatic pressure, the entire vertical casting unit 23 is moved and adjusted in a direction parallel to the mold clamping direction, so that casting can be adjusted in response to dimensional changes in the molds 30 and 32. The sleeve 58 can be correctly opposed to the fixed sleeve 38 of the molds 30, 32. The casting operation is the same as in the previous embodiment.

In each of the above embodiments, the present invention has been applied to a die-casting machine, but it can be similarly applied to a horizontal clamping type or vertical injection type plastic injection molding machine.

[Effect of idea]

As is clear from the above explanation, according to the present invention, in the injection device support structure of the injection molding device,
A fixed plate for fixing a fixed mold is integrally formed with a vertical member and a horizontal member extending from the lower end toward the fixed plate, and the injection device is supported by a support member hanging from the horizontal member. Since the entire unit is supported by a strong movable platen, the injection device will not sink due to its weight, and this will prevent molten metal from gushing out from the gap between the casting sleeve and the mold, and from forming burrs on the joint surfaces. In addition, the upper end mounting portion of the injection device support member does not occupy a space, and the mounting space for the mold can be expanded.
Furthermore, since the spacing between the injection device support members can be made narrower than in the case of conventional column support, the width of the entire machine can be reduced and the machine can be made more compact.

[Brief explanation of drawings]

1 to 4 show an embodiment of the injection device support structure of an injection molding device according to the present invention, FIG. 1 is a vertical cross-sectional view of a die casting machine implementing this, and FIG. 3 is a vertical sectional view of a die casting machine showing another embodiment of the present invention corresponding to FIG. 1, FIG. 4 is a BB sectional view of FIG. 3, and FIG. 5 is a conventional injection device. FIG. 2 is a side sectional view of a die casting machine implementing a support structure. 21... Die casting machine, 24... Machine base, 25, 61... Fixed plate, 25a, 61a...
...Vertical member, 25b, 61b...Horizontal member, 4
0,63...Tie rod, 42...Support beam,
44... Injection device, 49... Pin.

Claims (1)

[Scope of utility model registration request] In a horizontal mold clamping, vertical injection type injection molding device, a fixed plate fixed on a machine base is integrally formed with a vertical member and a horizontal member extending from its lower end in the direction of the movable plate, and a fixed plate that hangs from the horizontal member. An injection device support structure for an injection molding device, characterized in that the injection device is supported by a support member.