JPS61181618A - Resin material feeding apparatus in compression molding - Google Patents

Abstract

PURPOSE:To make a feeding system linear and shorter, by feeding a resin material to a bottom force by the relative movement of an extrusion die and an extruder. CONSTITUTION:A prescribed amount of a fluidized resin material is stored in an accumulator 4. A supply port 20 is moved forward by a moving means 30 to a supply starting point of a bottom force 7, and the width of the opening is matched to the width of the molding surface of the bottom force 7 by opening/closing rods 23, 23 of a configuration changing means 21. An on-off valve 40 is opened to bring an extruder 3 and an extrusion die 5 near together by a displacing means 39. An extrusion pipe 16 is moved forward in the accumulator 4 to supply the resin material to the bottom force 7. A truck 29 is retracted by the moving means 36 to retract the supply port 20. The opening/closing rods 23, 23 are retracted to change the opening in accordance with the width of the intended item that is moved, and the resin material having a crosssectional shape corresponding to the intended item is supplied to the bottom force 7. Accordingly, the system of feeding the resin material from the extruder can be made linear and shorter.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a resin material supply device for full contraction molding.

(Prior art) Regarding a device for supplying resin material to the lower die of a compression molding machine that performs compression molding of resin material with an upper die and a lower die, Japanese Patent Publication Sho, 59
-/7ri No. 3/ Publication discloses an extruder for extruding a fluid plastic material, a measuring cylinder for storing resin material from the extruder, and an injection device for injecting the resin material from the measuring cylinder into a lower mold. Those with the following are listed. In this resin material supply device, the extruder is basically fixed, the measuring cylinder and the injection device are integrated and can be moved vertically and horizontally, and the extruder and the measuring cylinder are connected by a conduit. ing.

In this prior art, the resin material is supplied from the metering cylinder to the injection device by moving a plunger connected to a piston rod of an operating cylinder. Therefore, the movement of the injection device and the supply of resin material to the lower mold must be performed by completely separate operating means. Also,
In order to allow full movement of the injection device over the lower mold, the conduit connecting the extruder and metering cylinder must be a bent tube with a joint in the middle, and the system for feeding the resin material from the extruder As the path becomes longer, the heat insulating device that prevents the resin material from cooling and hardening becomes troublesome, and the flow path resistance when feeding the resin material becomes high (which makes it difficult to use low-flowability resin materials).

(Object of the Invention) The present invention involves, when moving a resin material supply port on a lower die, relatively moving an extrusion die with the resin material supply port and a resin material extruder, and controlling this relative movement. By using this method to supply the resin material to the lower mold, the resin material feeding path can be made straight and short.

(Structure of the Invention) In the resin material supply device of the present invention, a cylindrical accumulator for storing resin material is fixedly provided to a resin material extrusion die having a resin material supply port facing above the lower mold, A resin material extruder that extrudes a resin material into the accumulator is provided with an extrusion pipe fixedly fitted into the accumulator so as to be movable in a forward and backward manner. Then, displacing means for changing the relative position between the resin material extrusion die and the resin material extruder is provided, and by changing the relative position when moving the supply port on the lower die, the extrusion pipe is moved into the accumulator. The resin material is supplied to the lower mold as the supply port moves.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a resin material supply device 1 in relation to a compression molding machine 2. As shown in FIG. In this resin material supply device 1, 3 is an extruder that heats and fluidizes the resin material and extrudes it, 4 is an accumulator that measures and stores a predetermined amount of the resin material from the extruder 3, and 5 is the resin material from the accumulator 4. This is a resin material extrusion die that supplies the material to compression molding [2]. The compression molding machine 2 compresses and molds a resin material using a lower mold 7 attached to a bed B and an upper mold 10 attached to a ram 9 that is raised and lowered by a cylinder device 8 to obtain a molded product 11 shown in FIG. It is.

Specifically, the extruder 3 includes a heating cylinder 13 into which an extrusion screw 12 is inserted, and a hopper 14 attached to the heating cylinder 13. The resin material is heated to become fluidized and then extruded. At the tip of the extruder 6, an extrusion pipe 16 for guiding the fluidized resin material to the accumulator 4 is provided coaxially and integrally fixed with the extrusion screw 12, and a check valve is installed at the tip of the extrusion pipe 16. 17 are provided. Moreover, this extruder 3 has a first cart 18
It is supported so that it can be raised and lowered by an elevator 19.

The accumulator 4 is cylindrical and has an inner diameter corresponding to the outer diameter of the extrusion pipe 16, and is fixed to the flange at the rear end of the resin material extrusion die 5 at the flange at the tip thereof, and communicates with the resin material extrusion die 5. are doing. Further, the accumulator 4 is coaxial with the extrusion pipe 16, and the extrusion pipe 16 is fitted into the cylinder so as to be movable forward and backward.

The resin material extrusion die 5 is equipped with a shape changing means 21 at its tip for changing the opening shape of the supply port 2°. Specifically, as shown in FIG. 3, the opening shape changing portion of the resin material extrusion die 5 is formed with through holes 22 and 22 that penetrate inside and outside of both side walls. Opening/closing rods 23 and 23 are respectively inserted into the supply port 20 so that they can move forward and backward into the supply port 20. In this case, the maximum medium W of the supply port 20 when both opening and closing rods 23, 23 are retreated to both sides is comparable to the maximum medium W of the molded product 11 shown in FIG. Also,
The diameter φ of the opening/closing rod 23 is larger than the opening height H of the supply port 20, and the opening width of the supply port 20 changes as the opening/closing rods 23.23 move back and forth, and when the opening/closing rods 23.23 come into contact, the supply stops. Mouth 2
0 is closed.

A rack guide groove 24 is formed in the width direction on the upper surface of the tip end of the resin material extrusion die 5, and the opening/closing rod 23, 23 is connected to the connecting tool 2 in the rack guide groove 24, respectively.
A rack 26.26 connected through the resin material extrusion die 5 is movably fitted, and a pinion 28.28 that is rotatably driven by motors 27, 27 fixed to the resin material extrusion die 5 is attached to both ranks 26.26, respectively. They mesh together.

The accumulator 4 and the resin material extrusion die 5 are supported on the second truck 29 so that they can be raised and lowered by an elevator 60, and a support wall 31 and a motor housing 32 are provided on the floor with an interval in front and back. This supporting wall 31
and the motor housing 32 between the first and 'th! trolley 1
A guide rod 33 is installed to guide the tube 8.29 in the longitudinal direction of the cylinder of the accumulator 4.

The extruder 3 is operated by a first motor 34 provided in a motor housing 32 and a first cart 1 which is rotated by the first motor 34 provided in a motor housing 32.
The accumulator 4 can be moved in the cylindrical length direction by means of a moving means 36 consisting of a threaded shaft 35 of 94/ which moves the accumulator 8 forward and backward. Further, the accumulator 4 and the resin material extrusion die 5 are connected to a second motor 37 attached to the second carriage 29 and a second screw type motor 37 which is rotated by the second motor 37 and moves the second carriage 29 relative to the first carriage 18. The positional relationship with respect to the extruder 3 can be changed in the cylindrical length direction of the accumulator 4 by means of a displacement means 69 consisting of the shaft 38. In addition, the resin material extrusion die 5
An opening/closing valve 40 for opening and closing the passage is provided at the base end of the passage.

Next, the supply of resin material and compression molding in the above embodiment will be explained in order.

b) The resin material extruder 3, accumulator 4 and extrusion die 5 are moved to the supply port 20 by the operation of the elevator 19.30.
Its height is set so that it can face above the lower mold 7.

The tip of the extrusion pipe 16 is positioned at the base end of the accumulator 4 by changing the relative positions of the extruder 3 and the resin material extrusion die 5 away from each other using the displacement means 69.

c) Pellet-like resin material is transferred from the hopper 14 to the heating cylinder 13.
is supplied to the accumulator 4 using the extrusion screw 12 while being heated and fluidized with the on-off valve 40 closed.
A predetermined amount of resin material is stored in a fluidized state.

2) Move the supply port 20 forward to the supply start point of the lower mold 7 using the moving means 36, and open/close the opening/closing rods 23, 23 of the shape changing means 21.
As a result of this operation, the opening width of the supply port 20 is adapted to the width of the molded product at the supply start point (the width of the molded product of the lower die 7).

e) Open the on-off valve 40, change the relative position of the extruder 43 and the resin material extrusion die 5 to the adjacent side using the displacement means 39, and move the extrusion pipe 16 forward within the accumulator 4, thereby transferring the resin material into the accumulator. 4 to the lower mold 7 through the supply port 20, the second cart 29 is moved backward by the moving means 66, thereby moving the supply port 20 backward from the supply start point to the supply end point of the lower mold 7. urge

At the same time, the opening shape of the supply port 20 is changed according to the width of the molded product at the position corresponding to the movement position of the supply port 20 by moving the opening/closing rods 23, 23 of the shape changing means 21 back and forth. As a result, a plate-shaped resin material having a cross-sectional shape corresponding to the shape of the molded product is supplied from the supply port 20 to the lower mold 7 .

f) When the supply port 20 moves to the supply end point of the lower mold 7, the above-mentioned opening/closing contacts 26 and 23 are brought into contact with each other and the supply port 20
is closed, and the resin material is cut off from this supply port 20.

g) The resin material extrusion die 5 is moved outside the lower mold 7 by the moving means 36, the upper mold 10 is lowered, and the resin material on the lower mold 7 is compression molded to obtain a molded product 11.

The above-mentioned operations (a) and (c) are performed when the resin material previously supplied to the lower mold 7 is being compression-molded.

In the above operation e), the amount of resin material extruded from the akinimulator 4 is determined by the change in the relative position (C speed) between the extruder 3 and the resin material extrusion die 5 by the displacement means 39, and The moving speed on the lower mold 7 is the sum of the above relative position change speed and the moving speed of the extruder 3 by the moving means 36. Also, when extruding the resin material, the check valve 17 acts to There is no return of materials.

With the above operation, the opening/closing contacts 23 and 23 move forward and backward independently of each other depending on the shape of the molded product, and the moving speed of the supply port 2o is adjusted by the moving means 66 and the displacement means 39 to lower the resin material. The amount of supply to each part of the mold 7, that is, the thickness of the plate-shaped resin is adjusted. In addition, if the molding surface of the lower die 7 has large irregularities in the vertical direction, the height of the supply port 20 is adjusted appropriately using the elevator 19.30, so that the supply port 20 follows the irregularities of the molding surface. It may also be moved by

In this embodiment, the resin material is supplied while moving the supply port 20 backward on the lower die 7, but the supply may be carried out while moving the supply port 20 forward by the moving means 36. In this case, the moving speed of the supply port 20 is the moving speed of the extruder 3 by the moving means 66 minus the displacement speed by the displacement means 39.

In addition, the resin material is provided with a heat-retaining heater (not shown) in the extrusion pipe 16, the accumulator 4, and the resin material extrusion die 5.
By providing this, cooling hardening in the middle of the yarn feeding path is prevented.

Therefore, in the case of the above embodiment, by simply moving the supply port 2o in one direction on the lower mold 7, it is possible to supply a plate-shaped resin having a width that corresponds to the shape of the molded product in a short time. The occurrence of flash is extremely reduced, and since there is little flow of the resin material within the mold, 70-marks are less likely to occur.

Further, since there is almost no time lag in the progress of curing of the supplied plate-shaped resin in each part, a high-quality molded product that is less likely to generate charge marks can be obtained. In addition, the supply path of the resin material from the extruder 3 is straight and short, and the material supply time to the lower die 7 is short, and the supplied resin material is a plate-shaped body that is integrated without any gaps. Therefore, it is possible to use a resin with low fluidity, and the physical properties of the molded article 11 can be improved.

Next, another embodiment regarding the displacement means will be described based on FIG. 7.

That is, in this embodiment, a support base 43 is supported by a first cart 42 that is moved forward and backward by a moving means 41 so as to be movable up and down by an elevator 44, and the extruder 3 is fixed to this support base 46. On the stand 43, an accumulator 4 fixed to a second cart 45 (this is fixed to the resin material extrusion die as in the previous embodiment) can change its relative position with the extruder 3 by a displacement means 46. It is supported as such. Therefore, this example basically has the same effect as the previous example, and furthermore, the extruder 3 and the accumulator 4 (resin material extrusion die) are supported by a single support stand 43. Therefore, it becomes easy to control the elevation when adjusting the height of the supply port.

In addition, in the above embodiment, when moving the supply port on the lower die, both the moving means and the displacement means are controlled simultaneously, but the length of the accumulator is longer than the movement stroke required by the supply port. In such a case, both the movement of the supply port and the supply of the resin material may be performed only by operating the displacement means.

Further, regarding the supply port of the resin material extrusion die, although the opening shape is changed in the embodiment, the opening shape may be fixed depending on the shape of the molded product. and,
This supply port may also be directed downward.

In addition, if a means for changing the opening shape of the supply port is provided, the supply port portion of the resin material extrusion die may be made removable, and a shape changing means suitable for the high shape of molding may be attached. The operation may also be performed by a cylinder device.

Further, in the above embodiment, the opening width of the supply port is changed, but an opening/closing body that is movable in the vertical direction is provided at the supply port, and an operating means such as a rack and pinion type is attached to this opening/closing body to supply the supply port. By changing the opening height of the mouth, the thickness of the resin material can be changed with high precision.

Further, both the width and the wall thickness of the resin material may be changed simultaneously by using the opening width changing means and the opening height changing means in combination.
Furthermore, by providing an opening/closing body that is sandwiched between the supply port so as to be able to move up and down, and closing a part of the supply port by moving this opening/closing body up and down during the supply of the resin material, the resin material can be removed. It may be supplied to the lower die in a hollowed state.

Furthermore, in the present invention, not only thermoplastic materials but also thermosetting materials may be used as the resin material, and of course, resin materials mixed with reinforcing fibers or other fillers may also be used.

Furthermore, although the moving means 36.41 and the displacement means 39.4<S in each of the above embodiments each used a screw shaft rotated by a motor, a cylinder device may be used instead.

Furthermore, in each of the above embodiments, the extrusion die 5 was moved only forward and backward relative to the compression molding machine 2, but in addition to this, the carriage 18, 29, 42, support wall 31, motor housing 62, etc. When molding a wide molded product by moving the floor member in the lateral direction, the floor member is sequentially moved in the lateral direction several times, that is, the extruder 6 and extrusion die 5 are sequentially moved in the lateral direction several times, and the The resin material may be supplied onto the lower die 7 while moving the extrusion die 5 at each time.

(Effects of the Invention) According to the present invention, the extrusion pipe fixed to the extruder is inserted into the accumulator fixed to the resin material extrusion die to change the relative position between the extrusion die and the extruder.
It is possible to make the feeding thread path of the resin material from the extruder straight and short, which allows the resin material to flow easily, and allows changing the type of resin material, for example, the color, to be done easily and quickly. It becomes possible to apply fluid resin materials.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially sectional side view showing a resin material supply device in relation to a compression molding machine;
FIG. 2 is a perspective view showing an example of a molded product, FIG. 3 is a perspective view of a resin material extrusion die, and FIG. 3 is a side view showing another embodiment of the resin material supply device. 1... Resin material supply device, 2... Compression molding machine, 6... Extrusion fi, 4... Accumulator, 5... Resin Material extrusion die, 7.
... lower mold, 11 ... molded product, 16 ...
... Extruded pipe, 20 ... Supply port, 39.4
6...Displacement means Fig. 4

Claims (1)

[Claims] (1) A resin material extrusion device that supplies resin material to the lower die of a compression molding machine that performs compression molding of resin material with an upper die and a lower die, and has a resin material supply port facing above the lower die. a die, and fixedly provided to the resin material extrusion die,
An accumulator that stores resin material and an extrusion pipe that supplies resin material to the accumulator are fixed.
and a resin material extruder in which this extrusion pipe is inserted into an accumulator so as to be movable back and forth; and a displacement means for changing the relative position of the resin material extrusion die and the resin material extruder in the cylinder length direction of the accumulator. A resin material supply device for compression molding, characterized in that the resin material is supplied from a supply port to a lower mold by moving an extrusion pipe within an accumulator.