JPS61147956A - Structure for supporting injection device of injection molding device - Google Patents

Abstract

PURPOSE:To support the entire part of an injection device with a secure stationary platen for supporting a stationary die and to improve safety by forming integrally said stationary platen of a vertical member and a horizontal member and supporting an injection device by a supporting member suspended from the horizontal member. CONSTITUTION:The stationary platen 25 of a horizontal clamping unit 22 is integrally formed of the approximately square vertical member 25a having substantial rigidity and the horizontal member 25b extending horizontally from the part excluding the part on right and left sliding plates 24c at the bottom end thereof. The bottom end of the member 25a is fixed to the plate 24c by means of plural bolts 26 and is fixed to a machine base 24. The horizontal member 25b of the platen 25 is formed slightly smaller than the space between the plates 24c and is not fixed to the machine base 24. The stationary plate is so constituted as to deflect downward to a slight extent by the exertion of external force.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an injection device support structure for supporting an injection device on a 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 clamping direction and the injection direction in the same direction, but in recent years, molten metal has been introduced from below into the cavity of a mold clamped horizontally. Alternatively, a horizontal mold clamping and vertical injection star injection molding apparatus for injecting resin has been developed by the present applicant and is disclosed in, for example, Japanese Patent Publication No. 58-55859.

FIG. 6 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, which is fixed on the floor and facing from the back side of the paper in the figure. A fixed platen 2 is placed on the machine space 1 extending toward
and a cylinder platen (not shown) are erected facing each other, and the four corners of the fixed platen 2 and the cylinder platen are connected by columns 3. , is equipped with a fixed platen 6 connected to the lower column 3 by four vertical swivel bars 12, and an injection cylinder 8 is fixed upward on the lower surface of the fixed platen 6.◇Fixed platen A block 10 that supports the casting sleeve 9 is supported above the casting sleeve 9 so as to be able to rise and fall freely through the 2mm 11. A plunger (not shown) is provided. The entire injection device 4 configured in this way is
A pair of tie bars 1 fixed to and hanging down from a pair of lower columns 3
A pair of support beams 13 are fixed to the lower ends of the plate 2 with nuts 14, and the fixed plate 6 is rotatably supported by the support beams 13.

On the other hand, a stationary metal plate 15 and a movable mold (not shown) are respectively attached to the fixed platen 2 and a movable platen (not shown) in front of the stationary platen 2, and move together with the movable platen to horizontally mold the mold. A cavity 5 and a fixed sleeve 7 are formed on the joint surface between the movable metal and the fixed metal 15 to be tightened. After pouring the metal into the casting sleeve 9, the block 10 is moved by the ram 11. When the casting sleeve 9 and the fixed sleeve T are joined together by rising, the plunger is raised by the hydraulic pressure of the injection cylinder 8, and the molten metal in the casting sleeve 8 is injected into the cavity through the fixed sleeve T. Casting is performed by.

Such horizontal clamping, vertical injection star injection molding equipment is characterized by the fact that the length of the molten metal in the casting sleeve 9 is short and the temperature drop of the molten metal is small, the contact area between the molten metal and air is small, and injection molding is Due to less mixing of molten metal and air), there are fewer cavities caused by gas in the casting sleeve 9, and the injection plunger faces the cavity when filling is completed, so the pressure is effectively applied. Although it has many advantages such as good transmission, there was a problem with the support structure of the injection device 4.

[Problem that the invention seeks to solve]

That is, in the conventional injection molding apparatus, the injection apparatus 4 as a whole is fixed to the column 3 at its proximal end and is supported by the hanging tie bars 12, so the column 3 is bent by the weight of the injection apparatus 40, and the casting sleeve is bent. When 9 and the fixing sleeve 7 made of gold 15@ were joined together, there was a risk that a gap would be created at the joint surface, causing a crack in the cast product or molten metal spouting out. In addition, the mounting space at the upper end of the tie bar 12 occupies space, which narrows the mounting space for the metal fittings, or the tie bar 12 is suspended from the widely spaced column 3, which increases the machine width in the direction shown. This has become an obstacle to downsizing machines.

[Means for solving problems]

In order to solve the above-mentioned problems, in the present invention, the lower end of the fixed plate that supports the fixed metal is fixed to the machine base side, and nine vertical members are connected from the lower end of this vertical member to the bottom of the mold. When the injection device is supported by the support member hanging from the horizontal member, the horizontal member is attached to both sides of the machine base in the machine width direction. It was installed so as not to hit the inside part of the slide member provided as a slide member, so that it was not fixed to the fund side.

[Effect]

Before the molten metal is injected, the horizontal members of the stationary plate are rigid enough not to bend, so that the sleeves of the mold and the injection device are joined without any gaps, and when the molten metal is injected, the reaction force of the injection pressure The horizontal part of the fixed plate that does not touch the machine base will bend slightly in the direction away from the metal, but
Since this direction is opposite to the injection direction, there will be no scratches on the metal dividing surface.In addition, the lower end of the vertical part of the fixed plate is directly fixed on the machine base, and the fixed plate Since the horizontal member part of the fixed plate bends and escapes, the vertical part of the fixed plate hardly bends.

〔Example〕

This embodiment shows an example in which the injection device support structure according to the present invention is implemented in a vertical casting type die-casting machine with horizontal tightening. Fig. 1 is a longitudinal sectional view of the die-casting machine in which this is implemented, and Fig. 2 FIG. 1 is a partially cutaway front view from A, FIG. 3 is a side view of the stationary platen and machine space, FIG. 4 is a plan view, and FIG. 5 is a partially cutaway front view of the injection cylinder. In the figure, a die casting machine 21 includes a horizontal mold clamping unit 22 and a vertical casting unit 23, and the horizontal mold clamping unit 22 as a whole is fixed on a floor surface and fixed on a north machine base 24. This machine pace 24 is integrally formed with a pair of left and right support members 24 extending in the length direction of the machine base, and a connecting member 24b (the one at one end is not shown) connecting both ends thereof. A pair of left and right slide plates 24e, each of which has a flat rectangular cross section and is a nine-long slide member, are integrally formed in parallel with each other on the upper ends of the left and right support members 24m. The fixed platen 25 of the horizontal mold clamping unit 22 is a square vertical member 25 m having sufficient rigidity;
It is integrally formed with a horizontal member 25b extending in the horizontal direction from the lower end of the left and right slide plates 24e except for the upper parts, and the lower end of the vertical member 25& is attached to the slide plate 24e with a plurality of bolts 26. It is fixed to the machine pace 24 by fixing. The horizontal member 25b of the stationary platen 25 has a width indicated by the symbol W in FIG. ), a cylinder platen (not shown) faces a fixed platen 25 and is movable and adjustable at the other end of the machine base 24, which is configured to bend downward, albeit slightly, when an external force is applied in the vertical direction. The identification plate 25 and the cylinder platen are connected to the column 2 which is fixed with a nut 26.
7 connects the four corners. A movable plate 28 faces the identification plate 25 and is fitted with a movable plate 2A27, and is formed so as to be movable in the distance direction with respect to the fixed plate 25 on the slide plate 24c. The space between them is connected by a trouble mechanism 29.

30 is restricted from vertical movement by a key 31 provided horizontally on the fixed plate 2S, and is positioned perpendicularly to the plane of the paper by a key 31m provided vertically in the center of the fixed plate 25. Fixed mold Ashi, Maku, 3
2 is made of movable metal and is mounted on a movable plate 28 with its movement in the vertical direction restricted by a key 33.
0.32 are joined so that they can be opened and closed in the horizontal direction with the dividing surface 34 as a boundary. Here, on the center line of the machine, a vertical key 3 is placed between the fixed platen 25 and the fixed mold 30.
The 1 m is provided for the casting sleeve 5B (described later) of the vertical casting unit 23 provided below the mating surfaces of the fixed mold 30 and the movable mold 320 on the center line of the machine.
In order to easily align the horizontal center of the fixing metal ff13G, the 0-ryokai ff130.32 has a cavity 35, a constricted part 36 below it, and a downwardly opening opening following the constricted part 36, and a vertical The hole 37 is divided 7ilr34
The vertical hole 37 is provided with a half-shaped fixing sleeve 38 fitted therein. 39 is a product extrusion device that extrudes the cast product from inside the cavity 35.

On the other hand, the horizontal casting unit 23 is connected to the horizontal member 2 of the fixed platen 25.
The tie rods 40 are provided with four tie rods 40 whose upper ends are screwed into the screw holes provided in the machine space 24 and which hang down, and these tie rods 40 pass between both support members 24 & of the machine pace 24, and are attached to bits provided under the floor surface. 41. 42 is a pair of supporting members 42m, and a connecting member 42b connecting both ends of the supporting members 42m,
42c, and two tie rods 40 are inserted into each support member 42 and the threaded portions of the lower ends thereof are inserted into each support member 42.
By screwing together and tightening a pair of upper and lower nuts 43 and 44, the frame 42 is firmly supported in a horizontal state.The injection device 45, the details of which are shown in FIG. freely supported.

That is, the injection device 45 is equipped with a rod-side pushpiece 46 having a plunger hole, and a head cover is attached to the lower end screw portion of the tie head 47 which is screwed into the screw holes at the four corners of the lower surface and hangs down. 48 is fitted, and a nut 49 is screwed together. A cylindrical cylinder tube 50 is interposed between the upper and lower rod side blocks 46 and the rod cover 48. It is firmly fixed by tightening. Here, the four-side pulley 46° tie rod 47. Head cover 48. The nut 49° cylinder tube 50 and the like form an injection cylinder 55.

A tilting wheel 51 with seven flange is centered and protruded from both sides of the rond side block 460), and by supporting this tilting shaft 51 in the shaft hole of the frame 42,
The entire injection device 45 is rotatably supported by the frame 42. Reference numeral 52 denotes a pair of docking bars that stand upright with their lower flat parts fixed to both sides of the head block 46 with keys and bolts.The main part is formed in the shape of a round bar. The cylinder holes 53& are slidably fitted. The sleeve frame 53 has a U-shaped coupling receiving portion 53b at the lower end.
The cylinder hole 53 is integrally formed with a cylinder portion 53e that extends upward from both sides thereof, and a sleeve support portion 53d that connects the cylinder portions 53e on both sides at the upper end.
It is configured to rise from the position shown in the figure by introducing pressure oil into m. In FIG. 2, 54A is a stopper fixed to the stationary platen 25 to restrict the upper limit of the sleeve frame 53, and 54B is a stopper fixed to the frame 42 to restrict the lower limit of the sleeve frame 53.

The injection cylinder 55, which has the cylinder tube 50 as its main part, is provided with a piston rod 56 that moves up and down by introducing pressure oil into the cylinder tube 50. The upper end portion is pivotally supported by ground metals 5 and 7 which penetrate through the frame 46 and are fixed to the frame 46. 58 is formed into a cylindrical shape n
Sleeve support portion 53d at the upper end of sleeve frame 53
A plunger 59 is pivotally supported on this sleeve so as to be able to move up and down, and the lower end of the plunger 59 is concentrically connected to the piston rod 56 by a coupling 60. The outer circumferential surface of the lower end of the coupling 60 is in contact with the inside of the upper surface of the coupling receiving portion 53b of the sleeve frame 530, and can be moved away from the sleeve 7.
It slides into liner 61 attached to both sides of the frame 53 to move up and down. As the sleeve frame 53 rises, the casting sleeve 58 is fitted into the vertical hole 3T shown in FIG. It is configured to rise into the inner hole of the sleeve 38. A centering ring 62 is fixed to the horizontal member 25b of the fixed platen 25 and guides the casting sleeve 58.

Next, a tilting device for tilting the entire injection device 45 for pouring will be described. The four-side block 46 and the head cover 48 are vertically connected on one side by a pair of connecting plates 63, and a pair of brackets 64 are fixed to the connecting member 42b of the frame 42 and extend diagonally downward. It is installed protruding into. 65 is a bearing 66 on the bracket 64
A tilting cylinder rotatably supported via the
The working end of the piston rod 6T is pivotally connected to the connecting plate 63 by a pin 68, and by moving the piston rod 6T forward and backward using pressure oil, the entire injection device 45 is
It is configured to stand upright and tilt between the solid line position and the chain line position in the figure. Further, a striker 69 is fixed to the shaft end of the tilting shaft 51 that rotates integrally with the injection device 45, and a pair of upper and lower limits are provided on the frame 42 corresponding to the working end of the striker 69. switch 70.71
are fixed, and the structure is such that the rising and tilting operations of the injection device 45 are stopped by their contact.

The operation of the die casting machine configured as above will be explained. When the sleeve frame 53 and the plunger 59 are lowered as shown in the figure and the injection device 45 is upright, when pressure oil is introduced to the long end side of the tilting cylinder 65 and the piston rod 67 is retreated, the injection device 45 as a whole is tilted around the tilting axis 51 to the chain line position,
It is stopped by contact between the striker 69 and the limit switch TO. Therefore, the casting sleeve 5 was installed at the side of the water heater.
After injecting the molten metal into a, when pressure oil is introduced to the head end side of the tilting cylinder 65 and the injection device 45 is rotated, due to the contact between the striker 69 and the limit device T1,
The injection device 45 stops in an upright position. Prior to this, on the other hand, the movable platen 28 is advanced by the mold clamping cylinder via the trouble mechanism 29, and since the mold clamping of both sides 1130.32 is completed, the cylinder hole 53m and the injection cylinder 55 are moved forward. By simultaneously supplying oil, the sleeve frame 53 rises leaving the dotting ram 52 at t\ in the molten metal holding state when the plunger 59 is lowered within the casting sleeve 58, and the casting sleeve 58 moves into the vertical hole 3T. When oil is further supplied to the injection cylinder 55 after the oil enters and is pressed against the lower end surface of the fixed sleeve 38, the plunger 59 rises and the molten metal flows into the cavity 35 through both sleeves 58, 38 and the constriction 36. is ejected.

When the molten metal is injected, the molten metal pressure acts on the molds 30 and 32, and if the fixed platen 25 is completely fixed to the machine space 24, there is no place for the molten metal pressure to escape and the molds 30 and 32 try to open. However, in this device, the vertical part 2 of the fixed platen 25
5 has sufficient rigidity. On the other hand, since the horizontal member 25b of the stationary plate 25 is located between the sliding plates 24e of the machine space 24 and is not fixed, the reaction force of the molten metal pressure is directed downward against the horizontal member 25b. The horizontal member 25b is deflected by a minute amount. Therefore, the downward reaction force only causes the entire injection device 45 to swing by a small amount along with the tie rod 40 through the deflection of the horizontal member 25b, and the vertical member 25a does not deflect and the gold W 30° 32 does not open. .

Unfortunately, just before the end of injection, cavities 3 of molds 30 and 32
5, a large injection pressure acts on the horizontal member 25b of the fixed platen 25, causing it to bend slightly downward, causing the casting sleeve 58 to slightly separate from the fixed sleeve 38 below the molds 30, 32. However, at this time, a thin solidified layer is formed on the surface of the molten metal that is in contact with the inner surfaces of the fixed sleeve 38 and the casting sleeve 58, so that the molten metal flows from the mating surfaces of the fixed sleeve 38 and the casting sleeve 58. It does not blow out and does not interfere with the injection operation.

After injection is completed and the molten metal is assimilated and cooled, the cylinder hole 5
Pressure oil is removed from 3 m and sent to the long end side of the injection cylinder 55, and the sleeve frame 53 and plunger 59 are lowered together, and the casting sleeve 58 is inserted into the molds 30, 32.
After separating the product from the mold 30 and
32, one cycle is completed.

Although this embodiment shows an example in which the present invention is implemented in a die-casting machine, the present invention can be similarly implemented in a plastic injection molding apparatus for horizontal pruning and vertical injection molding.

〔Effect of the invention〕

As is clear from the above description, in an injection molding apparatus according to the present invention, a fixed plate supporting a fixed mold is connected to a vertical member whose lower end is fixed to the machine base side and a lower end of the vertical member. The injection device is integrally formed with a horizontal member that protrudes downward from the mold, and the injection device is supported by a support member that hangs down from the horizontal member. The entire injection device is supported by a strong fixed plate by providing it on the inside of the slide member provided so as not to damage it and not fixing it to the base side. The joint surfaces of the casting sleeve and fixed sleeve do not separate due to the weight of the injection device, unlike those supported by tie rods, and
Even if the reaction force due to the injection pressure acts on the fixed plate, the horizontal member will warp by a small amount and the entire injection device will swing by a small amount, so the metal part will open fcJ) Joining the cast sleeve and the fixed sleeve Since the surfaces are not spaced apart from each other, it is possible to prevent the molten metal from spouting out or from generating splatter, thereby improving work safety and the quality of the injection device. In addition, the upper end mounting portion of the injection device support member does not occupy space, making it possible to expand the mounting space for the mold, and making it possible to narrow the spacing between the injection device support members compared to conventional column support. This reduces the width of the entire machine and allows for smaller machines.

[Brief explanation of drawings]

1 to 5 show an embodiment of the injection device support structure of an injection molding device according to the present invention, and FIG. Fig. 2 is a partially cutaway A front view of Fig. 1, Fig. 3 is a side view of the stationary platen and machine space, Fig. 4 is a plan view, and Fig. 5 is a partially cutaway pressure surface view of the injection cylinder. Figure 6 is a side sectional view of a die casting machine with a conventional injection device support structure.
...Die-casting machine, 24...Machine pace, 24C...Sly)'[,25...Fixed plate,
25a...Vertical member, 25b...Horizontal member, 2
6...Pol), 30...Made of fixed gold, 32...
・Movable Venus, 40...Tie rod, 45...Injection device, W...Width of horizontal member, Wl...Distance between slide plates 0

Claims (1)

[Claims] In a horizontal mold clamping, vertical injection type injection molding device, a fixed plate supporting a stationary mold is integrally formed in an L-shape by a vertical member and a horizontal member protruding downward from the lower end of the mold. This is fixed to the upper surface of the machine base at the lower end of the vertical member, and the injection device is supported by the support member hanging down from the horizontal member, and the horizontal member is attached to both sides of the machine base in the machine width direction. An injection device support structure for an injection molding device, characterized in that it is provided so as not to hit the inner side of a slide member provided as a part of the base, and is not fixed to the machine base side.