JPH07137077A - Reactive injection molding apparatus - Google Patents

Abstract

PURPOSE:To provide an RIM apparatus capable of easily making the attaching posture of a mold proper and capable of obtaining sufficient mold clamping force and easily performing the feed-out work of a resin molded product. CONSTITUTION:A fixed plate 25 and a movable plate 27 are arranged on a base 23 in mutually opposed relationship. The movable plate 27 can be driven in the direction coming close to and separating from the fixed plate 25. A turntable 29 capable of being rotated while holding a mold K is provided to the fixed plate 27. Moving mold clamping and relaxing devices 77, 79, 81, 83 having protruding arms 99 are provided to both side surfaces of the movable plate 27 and fixed mold clamping and relaxing devices 47, 49, 51, 53 having recessed arms 59 are provided to both side surfaces of the fixed plate 25. The protruding arms 99 and the recessed arms 59 are driven in an A-B direction to be connected.

Description

Detailed Description of the Invention

[0001]

The present invention relates to reaction injection molding (reaction injection molding) applicable to rigid polyurethane, semi-rigid polyurethane foam, reinforced polyurethane foam, dicyclopentadiene (DCPD) and the like.
The present invention relates to a RIM device for performing molding (hereinafter abbreviated as RIM).

[0002]

2. Description of the Related Art FIG. 9 shows a RIM device 1 according to a conventional example. In the figure, reference numeral 3 indicates a base, and this base 3
A fixed plate 5 is fixedly provided on the upper side. Further, a movable base 7 is provided on the base 3 so as to face the fixed plate 5, and the movable plate 7 can move in a direction in which the movable plate 7 approaches and separates from the fixed plate 5. One end of four tie bars 9 is fixed to the four corners of the fixing plate 5. The other end of the tie bar 9 is inserted into holes formed at the four corners of the movable plate 7 so that the movable plate 7 can slide. One end of a drive rod 11 is attached to the back surface of the movable plate 7.

A die K, which is divided into a female Ka and a male Kb, is attached to the fixed plate 5. The mold K is in such a posture that the liquid resin material injected into the mold K can be reliably and easily injected, and the gas generated when the resin material reacts smoothly escapes from the gas vent hole of the mold K. It is attached. After the mold K is attached to the fixed plate 5, the drive rod 11 is driven by hydraulic pressure to move the moving plate 7 in a direction in which the moving plate 7 approaches the fixed plate 5 (hereinafter referred to as A direction), and the moving plate 7 is moved to the female mold Ka. To fix.

Then, the moving plate 7 is driven in the A direction,
The mold K is pressed against the mold K to perform mold clamping, and the resin material is injected into the mold K. The resin material reacts and solidifies in the mold K to form a resin molded product such as an automobile handle or bumper.
Next, the drive rod 11 is driven by hydraulic pressure to move the moving plate 7 in a direction away from the fixed plate 5 (hereinafter referred to as B direction), and the resin molded product is removed from the mold K and carried out.

[0005]

However, since the mold K is considerably heavy, the resin material can be reliably and easily injected into the mold K, and the mold K is fixed in a posture in which the gas smoothly escapes from the gas vent hole. The work to attach to 5 is
It takes a lot of work. Moreover, since the proper mounting posture differs for each mold, the mold must be mounted in a different posture every time the mold is replaced, and there is a problem that a laborious and complicated work must be repeated. Further, since the RIM device 1 performs the mold clamping only by the driving force of the drive rod 11, the mold clamping force becomes insufficient at the end of the mold K, and it may not be possible to obtain a highly accurate resin molded product. There is also.

Further, since the RIM apparatus 1 is also provided with four tie bars 9, there is also a drawback that it is difficult to remove the resin molded product from the mold K and carry it out, because the tie bar 9 is an obstacle. The present invention has been made by paying attention to the above-mentioned conventional problems, and it is possible to easily make an appropriate mounting posture of a mold and obtain a sufficient mold clamping force. It is an object of the present invention to provide a RIM device that is easy to carry out.

[0007]

According to a first aspect of the present invention, there is provided a base, a fixed plate which is fixed on the base and holds one of the divided dies, and the fixed plate which faces the fixed plate. A moving plate movably provided in a direction of moving closer to and away from the plate, a moving plate drive device driving the moving plate in a direction of moving closer to and away from the fixed plate, and a resin injection device for injecting resin into a mold. A reaction injection molding apparatus having a rotary table that holds the other of the divided molds and can rotate the fixed plate at a desired position. .

According to a second aspect of the present invention, in the first aspect, when the movable plate is separated from the fixed plate by a certain amount or more, the movable plate side and the fixed plate side are separated, and when the movable plate approaches the fixed plate by a certain amount or more. The reaction injection molding apparatus is characterized by comprising a mold clamping / releasing device which is connected and drives the moving plate in the direction of approaching and separating from the fixed plate.

[0009]

According to the first aspect of the invention, the mold is attached to and held by the rotary table in a posture that facilitates the work. Then, by rotating the rotary table, the liquid resin material injected into the mold can be reliably and easily injected, and the gas generated when the resin material reacts smoothly escapes from the gas vent hole of the mold. Then, fix the turntable.
Then, the resin is injected into the mold by the resin injection device and reacted in the mold to form a resin molded product.

According to the second aspect of the present invention, when the movable plate is separated from the fixed plate by a certain amount or more, the mold clamping device is separated into the movable plate side and the fixed plate side, and when the movable plate is brought closer to the fixed plate by a certain amount or more. Be connected.
Then, with this mold clamping device, the molds held by the moving plate and the rotary table are tightened and loosened,
Moving plate is driven

[0011]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a RIM device 21 according to an embodiment of the present invention. In the figure, reference numeral 23 indicates a base, and a fixed plate 25 and a movable plate 27 are provided on the base 23. The fixed plate 25 and the movable plate 27 are arranged to face each other.

A detailed structure of the fixed plate 25 side will be described. The fixed plate 25 is provided on a plate base 26, and the plate base 26 is fixedly provided on the base 23. As shown in detail in FIGS. 3 to 6, a fixed platen 28 is fixed to the fixed plate 25.
8 is opposed to the moving plate 27.

Reference numeral 29 indicates a rotary table, and a large number of screw holes (not shown) are formed on the rotary table 29. Further, the rotary table 29 has four arc-shaped elongated holes 33.
It is formed in several places. Bolts 35, 37, and 39 are respectively inserted from these four long holes 33 and attached to the screw holes formed in the fixed platen 28, and the rotary table 29 is fixed to the fixed platen 2.
Fix at 8. The screw hole of the fixed platen 28 is the rotary table 2
They are arranged at regular intervals on the track of the elongated hole 33 when 9 is rotated.

As shown in detail in FIG. 5, the rotary table 2
9 is fixed to the tip of a rotary shaft 31, and the rotary shaft 31 is rotatably supported by a fixed plate 25.
The rear end of the rotary shaft 31 is connected to the piston rod 43 via the crank mechanism 41. The piston rod 43 is connected to a piston housed in a hydraulic cylinder 45, and the rotary table 29 can rotate within an angle range of 45 degrees.

Fixed side mold clamping / loosening devices 47, 49, 51, 53 are provided on both sides of the fixed plate 25. Since the fixed side mold clamping and loosening devices 47, 49, 51 and 53 have the same structure, the fixed side mold clamping and loosening device 47 will be described as a typical example. 49,
Reference numerals 51 and 53 are given the same reference numerals as those of the constituent members of the stationary mold clamping and loosening device 47, and the description thereof is omitted.

Reference numeral 55 represents an arm holder, which is attached to the side surface of the fixed frame 25. This arm holder 55 has an arm shaft 57.
Is held movably in the AB direction, and a concave arm 59 is fixed to the tip of the arm shaft 57. The arm shaft 57 and the concave arm 59 can be hydraulically driven in the AB direction.

Lock holes 61, 63 are formed in the concave arm 59 so as to penetrate therethrough in the vertical direction. Also a concave arm 5
9 is provided with a pin holder 65.
A lock pin 67 is held in the table so as to be able to move back and forth. A hydraulic cylinder 69 is attached to the pin holder 65, and the lock pin 67 is moved forward and backward by hydraulic pressure.

Next, the detailed structure of the moving plate 27 will be described. The moving plate 27 is provided on the plate base 71. The plate base 71 is slidably supported by rails 68 provided on the base 23. One end of a moving shaft 72 is fixed to the lower surface of the plate base 71. The moving shaft 72 is inserted into a moving hydraulic cylinder 73, and is driven in the AB direction by hydraulic pressure so that the plate base 71 drives together with the moving plate 27.

On both sides of the moving plate 27, moving side mold clamping and loosening devices 77, 79, 81 and 83 are provided. Since all of the moving side mold clamping devices 77, 79, 81, 83 have the same structure, the moving side mold clamping device 77 will be described as a typical example. 79,
Reference numerals 81 and 83 have the same reference numerals as those of the constituent members of the moving-side mold clamping device 77, and the description thereof will be omitted.

Reference numeral 85 indicates an arm holder, which is attached to the side surface of the moving frame 27. This arm holder 85 has an arm shaft 8
7. Auxiliary shafts 89 and 91 are movably held in the AB direction. A convex arm 99 is fixed to the tips of the arm shaft 87 and the auxiliary shafts 89 and 91. The convex arm 99 can be driven in the AB direction by hydraulic pressure and can be fixed at a desired position. Further, the convex arm 99 has a lock hole 100 penetrating vertically.
Are formed.

The arm holder 85 is provided with a stopper device 111 shown in FIGS. In the figure, reference numeral 113 indicates a stopper holder, and this stopper holder 1
A hydraulic cylinder 115 is attached to 13. A piston 117 is housed in the hydraulic cylinder 115, and one end of a stopper rod 119 is connected to the piston 117.

Reference numeral 121 indicates a stopper, and the other end of the stopper rod 119 is connected to the stopper 121. A recess 123 having a shape corresponding to the arm shaft 87 is formed in the stopper 121, and the recess 123 faces the arm shaft 87. The other end of the stopper rod 119 is connected to the stopper 121, and the hydraulic pressure causes the stopper 121 to move back and forth to the positions indicated by the solid line and the alternate long and short dash line.

A contact member 125 is fixed to the arm shaft 87. The contact member 125 can change its fixed position. A member 127 to be detected is attached to the stopper 121. This detected member 1
The position of 27 is detected by the sensors 129 and 131,
It is detected whether the stopper 121 has advanced to face the contact member 125, or has retracted and has retracted from the position facing the contact member 125.

The RIM device 21 is provided with a resin injection device for injecting a liquid resin into the mold K. The stationary side mold clamping / loosening device 47, 49, 51, 53 and the moving side mold clamping / loosing device 77, 79, 81, 83 constitute a mold clamping / loosening device. The moving shaft 73 and the moving hydraulic cylinder 73 constitute a moving plate drive device.

Next, the operation of the RIM device 21 will be described. First, a posture in which the liquid resin material to be injected into the mold K can be reliably and easily injected into the mold K, and the gas generated when the resin material reacts smoothly escapes from the gas vent hole of the mold K. The work of attaching the device so that With the movable plate 27 separated from the fixed plate 25, the mold K in which the female mold Ka and the male mold Kb are combined is attached to the rotary table 29 as shown in FIG. At this time, attach the mold K in a posture that facilitates the attachment work.

Next, the moving shaft 72 is driven in the A direction to move the moving plate 27 in the A direction. In addition, the convex arms 99 of the moving-side mold clamping and loosening devices 77, 79, 81, and 83 are moved in the direction A, and the fixed-side mold clamping and loosening devices 47, 49, and 5 are connected.
The concave arms 59 of Nos. 1 and 53 are driven in the B direction, and the convex arms 99 are fitted into the concave arms 59. Further, the lock pin 67 is advanced to lock the lock hole 61 of the concave arm 59,
63 and the lock hole 100 of the convex arm 99 are penetrated to connect the convex arm 99 and the concave arm 59.

Then, the concave arm 59 is driven in the direction A to bring the moving plate 27 into pressure contact with the mold K to perform mold clamping. This clamping should be done at the lowest possible pressure. After the mold is clamped, the lock pin 67 is retracted, and the lock holes 61, 6
3 and the lock hole 100. Then moving plate 2
7 is driven in the B direction to be separated from the fixed plate 25.

Next, the bolts 35, 37, 39 are loosened, and further the bolt in the rotating direction of the rotary table 29 is removed. That is, when the rotary table 29 is rotated 45 degrees clockwise from the state shown in FIG. 4 to the state shown in FIG. 6, the bolts 35 and 37 are removed. Then, the turntable 29 is rotated. Mold K in the state shown in FIG.
The liquid resin material injected into the mold K can be surely and easily injected, and the gas generated when the resin material reacts smoothly escapes from the gas vent hole of the mold K.

Then, the mold is clamped again at a low pressure in the same manner as above. Next, attach bolts 35 and 37, and bolt 3
Tighten 5, 37 and 39 to fix the rotary table 29 to the fixed platen 2
Fix at 8. In addition, the male Kb of the mold K is moved to the moving plate 2
Secure to 7 with bolts. Next, the convex arm 99 is driven in the A direction and the concave arm 59 is driven in the B direction to drive the moving plate 27 in the B direction to separate the mold K into a female mold Ka and a male mold Kb. , The lock pin 67 is retracted, and the connection between the concave arm 59 and the convex arm 99 is released. Then, the convex arm 99 is driven in the B direction and the concave arm 59 is driven in the A direction. Then, the moving plate 27 is driven in the B direction to open the mold K, and the work of attaching the mold K is completed.

Next, the operation for molding the resin molded product will be described. The moving plate 27 is driven in the A direction, the convex arm 99 is driven in the A direction, and the concave arm 59 is driven in the B direction to match the female mold Ka and the male mold Kb. Then, the convex arm 99 is fitted to the concave arm 59, and the lock pin 6
7 is advanced to connect the convex arm 99 and the concave arm 59. Next, the concave arm 59 is driven in the A direction, and the mold K is clamped.

Then, the resin material is injected into the mold K by the resin injection device. Since the mold K has the posture described above, the resin material can be surely and easily injected into the mold K. The resin material injected into the mold K reacts and solidifies to form a resin molded product. Also in this case, the mold K
Since the above has the posture described above, the gas smoothly escapes from the gas vent hole of the mold K.

Further, since the concave arm 50 and the convex arm 99 are connected at four places to perform the mold clamping, a sufficient mold clamping force can be obtained even at the end of the mold K. Therefore, it becomes possible to obtain a highly accurate resin molded product. Next, the stopper 121 progresses from the state shown by the solid line in FIG.
1 stops at a position facing the contact member 125.

After a certain time has passed for cooling, the concave arm 59 is driven in the B direction and the movable plate 27 is driven in the B direction to separate the female mold Ka and the male mold Kb of the mold K from each other. Do the mold. At this time, even if the arm shaft 87 to which the concave arm 99 is fixed is pushed and moves in the B direction, the contact member 125 contacts the stopper 121, so that the arm shaft 87 is prevented from moving in the B direction. It will be. Therefore, the movable plate 27 is driven in the B direction, and the mold K
The female Ka and the male Kb can be separated.

Next, the lock pin 67 is retracted, and the stopper 121 is further retracted to the position shown by the solid line in FIG. Then, the concave arm 59 drives in the A direction and the convex arm 99 drives in the B direction. Further, move the moving plate 27 to B
Drive in the direction and stop. Next, the resin molded product is taken out of the mold K and carried out. RI according to the conventional example shown in FIG.
Unlike the M device 1, the RIM device 21 does not have a tie bar, so that the resin molded product can be easily carried out.

Although the embodiment of the present invention has been described in detail above, the specific structure is not limited to this embodiment, and the present invention is not limited to the case where the design is changed without departing from the scope of the present invention. Included in the invention. For example, RIM device 2
1 uses hydraulic pressure as a driving source for the moving plate 27, the rotary table 29, the concave arm 59, the convex arm 99, the lock pin 67, but the invention is not limited to this, and for example, a motor or the like may be used. . In the above embodiment, the rotary table 2
Although the rotation angle of 9 is 45 degrees, the rotation angle is not limited to this and may be larger or smaller than 45 degrees.

[0036]

As described above, according to the first and second aspects of the present invention, the mounting posture of the mold can be easily made appropriate. Further, in the invention of claim 2, a sufficient mold clamping force can be obtained, and a resin molded product with high precision can always be obtained. Further, unlike the conventional RIM device, since there is no tie bar, it is easy to carry out the resin molded product.

[Brief description of drawings]

FIG. 1 is a perspective view of a RIM device according to an embodiment of the present invention.

FIG. 2 is a side view of a movable plate side of the RIM device according to the exemplary embodiment of the present invention.

FIG. 3 is a side view of a fixed plate side of the RIM device according to the exemplary embodiment of the present invention.

FIG. 4 is a front view of a fixed plate side of the RIM device according to the embodiment of the present invention.

5 is a cross-sectional view taken along line YY of FIG.

FIG. 6 is a front view of the fixed plate side in a state where the rotary table is rotated from the state shown in the figure.

FIG. 7 is a diagram for explaining the configuration and operation of the stopper device mounted on the RIM device according to the embodiment of the present invention.

FIG. 8 is a diagram for explaining the configuration and operation of the stopper device mounted on the RIM device according to the embodiment of the present invention.

FIG. 9 is a perspective view of a RIM device according to a conventional example.

[Explanation of symbols]

 21 RIM device 23 Base 25 Fixed plate 27 Moving plate 29 Rotary table 47, 49, 51, 53 Fixed-side mold clamping / loosening device 77, 79, 81, 83 Moving-side mold clamping / loosening device 72 Moving shaft 73 Moving hydraulic pressure Cylinder K Mold

Claims (2)

[Claims] 1. A base, a fixed plate which is fixed on the base and holds one of divided molds, and a movable plate which opposes the fixed plate and is movable in a direction of approaching and separating from the fixed plate. In a reaction injection molding apparatus having a movable plate, a movable plate driving device that drives the movable plate in a direction of approaching and separating from the fixed plate, and a resin injection device that injects resin into a mold,
The fixed plate holds the other of the divided molds,
Moreover, the reaction injection molding apparatus is provided with a rotary table that can be rotated and fixed at a desired position. 2. The movable plate according to claim 1, wherein the movable plate is separated into a movable plate side and a fixed plate side when the movable plate is separated from the fixed plate by a certain amount or more, and the movable plate is connected when the movable plate approaches the fixed plate by a certain amount or more. A reaction injection molding apparatus comprising a mold clamping / loosening device for driving the mold toward and away from the fixed plate.