JPH0811154A - Injection molding machine - Google Patents

Abstract

PURPOSE:To easily hold mold registering accuracy while facilitating the replacement of a mold or the changeover remodeling between a usual molded product and a hollow molded product. CONSTITUTION:One female mold 63 is attached to the inside of the fixed plate 52 provided on a base stand 51 in such a state that the nozzle of an injection device 57 is brought into contact with the outside of the fixed plate 52 and other female mold 64 is attached to the movable plate 55 advancing and retreating with respect to the fixed plate 52 by a drive means 56 in opposed relation to the female mold 63 and a core plate 60 having the male molds 65, 66 corresponding to the female molds 63, 64 attached thereto back to back is provided so as not only to be inserted in and extracted from the space between both female molds 63, 64 but also to be moved in the directions parallel and vertical to the advance and retreat direction of the movable plate 55 by a drive means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention forms a pair of half-molded products by injecting a molten synthetic resin or the like into a cavity formed between a pair of half-mold female molds and a male mold. The present invention relates to an injection molding machine that joins and welds these to manufacture a hollow molded product.

[0002]

2. Description of the Related Art FIG. 4 shows a hollow molded article manufacturing means disclosed in Japanese Patent Publication No. 2-38377. As shown in FIG. 4 (A), the slide die 3 in which the male die 15 and the female die 16 are formed is attached to the fixed platen 2 so as to be vertically slidable by the slide cylinder 9. Movable mold 4 in which female mold 17 and male mold 18 corresponding to male mold 15 and female mold 16 are formed
Is attached to a movable platen 10 which is movable left and right in the figure. As shown in FIG. 4B, a cavity 19, which is formed between the slide die 3 and the movable die 4 through the sprue 12, the sub-sprue 13, and the runner 21, from the injection machine 11,
After injecting the molten resin into 20 and solidifying it, as shown in FIG. 4 (C), the movable die 4 is separated to the left in the figure, and the slide die 3 is pulled up to the position shown by the slide cylinder 9. As shown in FIG. 4D, the movable die 4 is pressed against the slide die 3, and the sprues 12, 14 and the runner 21 are pressed.
After that, the molten resin is injected and bonded around the joint of the half-molded product. In addition, Japanese Patent Application Laid-Open No. 4-91914 discloses a configuration in which a mold is rotated instead of being slid.

[0003]

Although the conventional injection molding machine is as described above, the mold is slid in the direction perpendicular to the mold clamping direction between the time of forming the half-cut product and the time of joining and welding the same. However, there is a problem in that it is necessary to keep in mind the precision of mold matching because the mold is rotated or rotated in the circumferential direction. Further, there is a problem that it is difficult to replace the mold or switch and modify the ordinary molded product and the hollow molded product.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to easily maintain the accuracy of mold matching between the time of forming a half-molded product and the time of joining and welding the same. It is an object of the present invention to obtain an injection molding machine which can be replaced with a mold or can be easily modified by switching between a normal molded product and a hollow molded product.

[0005]

In the injection molding machine according to the present invention, one female mold is attached to the inside of a fixed plate provided on the base with the nozzle of the injection device abutting on the outside, and this fixed type. A core plate, in which the other female die is attached to the one female die face-to-face and the male die corresponding to these female die is attached back to back, is attached to the movable disc that is moved back and forth by the drive means relative to the disc. It is provided so as to be moved by a driving means in a direction parallel to the advancing / retracting direction of the movable plate and a direction perpendicular to the advancing / retreating direction of the movable plate so as to be inserted / removed between the female molds. Further, in the injection molding machine according to the present invention, the movable plate is guided by a tie bar to move forward and backward, and the core plate is moved by being guided by the tie bar. Further, the injection molding machine according to the present invention includes a fixed plate fixedly installed on the base so as to face each other, a tie bar connecting both fixed plates, and an injection device provided outside one of the fixed plates. , A movable platen which is driven by a mold clamping cylinder fixedly mounted on the other fixed platen and is moved forward and backward by being guided by the tie bar, and is mounted on the inside of the movable platen and the inside of the one fixed plate to face each other. Inserted between the female mold and the female mold
A core plate that is guided by the tie bar so as to be pulled out and moved by a drive means in a direction parallel to the direction in which the movable plate moves forward and backward and a direction that is perpendicular to this direction. It consists of a male type attached to.

[0006]

The core plate having the male mold of the injection molding machine according to the present invention attached back to back is inserted between both female molds, and the movable plate is propelled and tightened by the driving means, and the molten resin is transferred from the injection device to the female mold. When it is injected into the cavity between the male mold, a split product is formed. Next, after removing the core board,
Once again, the movable platen is propelled by the driving means and tightened, and the resin is injected from the injection device into the cavity around the halved divided product, and the periphery of the halved divided product is fused to form a hollow molded product. During this molding process, the core disc moves in the direction parallel to the direction of movement of the movable plate and in the direction perpendicular to it, and is inserted / removed between the female molds, which facilitates mold matching accuracy. Retained. Further, the mold can be easily replaced or the ordinary molded product and the hollow molded product can be easily modified. Further, when the movable plate and the core plate are guided by the tie bar, the mold matching accuracy can be maintained with a simple structure, and modification and the like can be facilitated.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 51 denotes a base of this injection molding machine. Fixed plates 52 and 53 are fixedly erected on the base 51, and the fixed plates 52 and 53 are four tie bars that bear a mold clamping reaction force. It is fixedly connected at 54. The movable plate 55 is a rail 9
The slider 91 is supported by a slider 91 that can slide on the surface 0, and is guided by a tie bar 54 so as to be movable left and right in the drawing. The mold clamping cylinder 56 that drives the movable platen 55 to move forward or backward in the left-right direction in the drawing is the fixed platen 53.
It is fixed to. The injection device 57 is installed on the base 51, and injects a predetermined amount of molten synthetic resin or the like from an injection port that is in communication with and in contact with a resin passage (sprue) of the fixed plate 52.

In FIG. 1, reference numeral 60 denotes a core disk, and the core disk 60 is fixedly supported by a core disk moving frame 58. The core disc moving frame 58 is supported by the tie bar 54 so as to be movable in the axial direction and rotatable about the axis.
Is driven forward and backward in the axial direction by a core disc advancing and retracting cylinder 59, and is rotationally driven around the axis of the tie bar 54 by a core disc rotating cylinder 61. The core board stopper 62 is
The core 60 is set at an accurate position in the molding state by being brought into contact with a stationary portion of the injection molding machine.

In FIG. 1, 63 is a female die attached to the fixed plate 52, 64 is a female die attached to the movable plate 55, and the female dies 63 and 64 are joint surfaces when the die is clamped. Are attached so as to face each other. Male dies 65 and 66 are attached back to back on both sides of the core 60 so as to correspond to the female dies 63 and 64, respectively.

FIG. 2A shows a state at the time of molding, in which the core 60 and the male dies 65, 66 are sandwiched and the female dies 63, 64 are clamped. FIG. 2B shows a state at the time of bonding,
As shown by the solid line in FIG. 1 (A) and the chain line in FIG. 1 (B), the male dies 65 and 66 together with the core 60 have escaped and retracted to the outside, and the female dies 63 and 64 are separated. It is in a state of directly abutting and closing the mold. As shown in FIG. 2, a resin passage 67 is opened in the fixed plate 52 so as to communicate with the injection port of the injection device 57. The female die 63 is provided with resin passages 68, 70 and 72 which communicate with the resin passage 67. The female die 63 is provided with an opening / closing valve 73 for opening / closing the resin passages 68 and 70 and an opening / closing valve 74 for opening / closing the resin passage 72. The resin passage 68 has a female die 63 and a male die 65.
Communicates with a cavity 76c formed between and.
The resin passage 70 is a resin passage 71 formed in the core 60.
Is in communication with. The resin passage 72 includes half-molded products 76 and 7.
It communicates with the peripheral portion of the joint with 7. The female die 64 is provided with a resin passage 69 which communicates with the resin passage 71 of the core 60 and a cavity 77c formed between the female die 64 and the male die 66.

Next, the operation of the injection molding machine shown in FIGS. 1 and 2 will be described. When forming a half-molded product,
As shown in FIG. 1B, the core disc rotating cylinder 61 is extended to lower the core disc 60 until the core disc stopper 62 comes into contact with the core disc, and the core disc 60 is set to the molding position indicated by the solid line. Next, FIG.
A female die attached to a fixed plate 52 on the right side of the drawing by shortening the core plate advancing and retracting cylinder 59 shown in (A) and guiding the core plate moving frame 58 integrated with the core plate 60 to the tie bar 54. 6
Send to 3 At the same time, when the movable plate 55 is propelled to the right in the drawing by the mold clamping cylinder 56, the movable plate 55 supported on the rail 90 via the slider 91 is moved by being guided by the tie bar 54, and the movable plate 55 is moved. As shown in FIG. 2A, the female die 64 attached to the
Male dies 66,6 mounted back to back on both sides of 0
Female mold 6 attached to the fixed platen 52 with 5 in between
Press on 3. Then, as shown in FIG. 2 (A), the female dies 63 and 64 are brought into contact with the peripheral portions of the male dies 65 and 66, respectively, and the cavity is provided between the female dies 63 and the male dies 65. 76c is formed, and a cavity 77c is formed between the female die 64 and the male die 66.

In this state, the movable platen 55 is squeezed to the right in the figure by the mold clamping cylinder 56 shown in FIG.
After the mold is clamped as shown in (A), the on-off valve 74 is closed,
When the on-off valve 73 is opened and the molten resin is injected from the injection device 57, the molten resin is injected into the cavity 76c from the resin passage 67 through the passage 68, and from the resin passage 70, which is a branch passage, to the passage 71 and It is injected into the cavity 77c through 69. The injection device 57 injects a predetermined amount of molten resin so as to completely fill the cavities 76c and 77c. Cavities 76c, 77
The molten resin filled in c is hardened or solidified by cooling or the like to form half-molded products 76, 77.

Next, as shown in FIG. 1A, the mold clamping cylinder 56 is shortened to retract the movable plate 55 and the female mold 64 to the left in the drawing, and the core disc advancing / retreating cylinder 59 is extended. The male dies 65, 66 attached to the core board 60 are moved to the positions shown by the chain lines, and then shown by the solid lines in FIG.
As shown by the chain line in (B), the core disc rotating cylinder 61 is shortened and the core disc 60 is flipped up outside the mold clamping position.
Hardened or solidified half-molded products 76 and 77 are attached in the molds of the female dies 63 and 64, respectively.

Next, again, the female die 64 is propelled to the right in FIG. 1 (A) by the die clamping cylinder 56, and the female die 64 is moved to the female die 63 as shown in FIG. 2 (B). When directly contacting with each other, the peripheral portions of the half-molded products 76 and 77 also directly contact with each other. A peripheral space portion 78 is formed on the outer periphery of the peripheral portions of the abutting half-molded products 76, 77 by the annular convex portions formed on the peripheral portions of the male dies 65, 66 during the above-described molding. Clamping is performed by the mold clamping cylinder 56 in a state where the half-molded products 76 and 77 are directly brought into contact with each other.
In (B), when the on-off valve 73 is closed, the on-off valve 74 is opened, and the molten resin is injected from the injection device 57, the molten resin is injected and filled from the resin passage 67 through the passage 72 into the peripheral space 78. , The joint between the half-molded products 76 and 77 is welded. When this is solidified by cooling or the like, the integrated hollow molded product can be taken out by separating the female mold 64 from the female mold 63.

Next, a second embodiment shown in FIG. 3 will be described. In the injection molding machine shown in FIG. 3, the fixed plate 5 is attached to the base 51.
2 are integrally erected, and the rail 90 on the base 51 is
Further, a movable plate 55 supported by a slider 91 and movable back and forth with respect to the fixed plate 52 is provided. A female mold 63 is attached to the fixed plate 52, and a female mold 64 is attached to the movable plate 55 so as to face each other. Four mold clamping tie bars 564 are horizontally fixed to the movable plate 55 toward the fixed plate 52, and the tip of the mold clamping tie bar 564 (the right part in the figure).
A screw-shaped unevenness 564s is formed on the. A through hole is formed in a portion of the fixed platen 52 to which the mold clamping tie bar 564 faces, and a cylinder is formed by the bushes 565 and 566, and a ram (piston) 562 that is slidable by hydraulic pressure is inserted into the cylinder. At the right end of the figure, a pair of half-threaded screw-like parts 568 that are opened and closed by hydraulic pressure are attached to the screw-shaped irregularities 564s of the mold clamping tie bar 564. With these components, the mold clamping tie bar 564 is hydraulically connected. A mold clamping cylinder 56 that draws the movable platen 55 through is configured. The core plate 60 is provided on the mold clamping tie bar 564 so as to be movable in the axial direction and rotatable in a plane perpendicular to the shaft, and the core plates 60 are fitted with male dies 65 and 66 back to back. .

Next, the operation of the injection molding machine shown in FIG. 3 will be described. First, when forming a half-molded product, the male dies 65 and 66 attached to the core 60 are lowered to a position between the female dies 63 and 64 as shown by a chain line, and a driving means (not shown) is used. The movable platen 55 is moved from the position shown to the fixed platen 52, and the male molds 65 and 66 and the core plate 60 are sandwiched and brought into contact with each other between the female molds 63 and 64. The ram 562 of the mold clamping cylinder 56 is set to the left position in the drawing in advance, the screw-shaped component 568 is opened, and the screw-shaped unevenness 564s of the mold-clamping tie bar 564 is inserted in the screw-shaped component 568. Is closed and fitted to the screw-shaped irregularities 564s. Next, hydraulic pressure is applied to the mold clamping cylinder 56, and the male molds 65 and 66 and the core plate 60 are passed through the ram 562, the screw-shaped component 568, the mold clamping tie bar 564 and the movable plate 55.
And clamp the female dies 63 and 64. Next, the molten resin is injected from an injection device (not shown), and the female mold 63,
Inject and fill the space between 64 and the male molds 65 and 66,
When cooled and solidified, a pair of half-molded products are formed.

Next, in FIG. 3, the screw-shaped component 568 is opened to remove the fitting with the mold clamping tie bar 564, and the movable platen 55 is moved leftward in the drawing by the driving means (not shown) to the position shown in the drawing. The male molds 65 and 66 and the core disc 60 are rotated from the position shown by the chain line to the position shown by the solid line. Next, again, the movable platen 55 is moved from the position shown in the drawing toward the fixed platen 52 by the driving means (not shown), and the female mold 6 is moved to the female mold 63.
4 directly abut. The ram 562 is in the left position in the drawing in advance, the screw-shaped part 568 is opened, and the screw-shaped part 568 is
Since the screw-shaped unevenness 564s of the mold clamping tie bar 564 is inserted in the inside, the screw-shaped component 568 is closed and fitted into the screw-shaped unevenness 564s, and hydraulic pressure is applied to the mold clamping cylinder 56 to apply the ram 5
Female mold 63 for holding each half-molded product via 62, screw-shaped component 568, mold clamping tie bar 564 and movable plate 55.
And 64 are clamped. Next, the molten resin is injected from an injection device (not shown), and is injected and filled into the space at the peripheral edge joint portion of the pair of half-divided molded products to be welded and then cooled and solidified to form a hollow molded product.

In FIG. 3, the mold clamping means may be reversed and the mold clamping tie bar 564 may be attached to the fixed plate 52 and the mold clamping cylinder 56 may be provided on the movable plate 55.

In the embodiment shown in FIG. 1 or 3, the core 60 is movable in the axial direction to the tie bar 54 or the mold clamping tie bar 564 by the core moving frame 58 and is rotated in a plane perpendicular to the axis. Although it is movably provided, the core plate 60 is for moving and setting the male dies 65 and 66 to a position between the female dies 63 and 64 or a position away from the female dies 63 and 64. Instead of moving it, it can also be moved vertically.

In the above embodiment, the half-molded product 76
2B, the same molten resin is injected from the injection device 57 by opening or closing the opening / closing valves 73 and 74 when joining and welding the peripheral portions of the and 77, as shown in FIG. 2B. An injection device for bonding is provided separately from the injection device 57 for injecting the resin for molding the half-molded products 76, 77 shown in FIG. 2 (A), and the half-molded product 76 is provided at the time of joining and welding shown in FIG. 2 (B). It is also possible to inject and bond a molten resin, which is different from the resin used to mold the adhesives 77, 77, with excellent adhesiveness, from an adhesive injection device. With such a configuration, the on-off valve 7
3,74 are unnecessary. Further, for the passage of the adhesive resin, for example, if a groove is formed in the joining surface portion of the mold to form an injection passage, the groove portion is opened when the mold is opened, so that the resin remaining in the groove portion can be easily treated. it can.

By adopting the above-described construction of the conventionally used apparatus, it is possible to relatively easily modify it into an injection molding machine capable of hollow molding. Further, if the core board 60 is placed in the retracted position, it can be used as an ordinary molding machine. Further, as shown in the figure, if the core 60 is of a rotary type, the installation space can be small. Also, the core board 60
If you slide and rotate the tie bar 54,
The structure is simple, the position is accurate, and the cost can be reduced. In addition, there is no obstacle on the mold, and the mold can be easily replaced. Further, since one female mold is always fixed, the injection device can be installed easily. In particular, if two sets of injection devices are provided and the one for adhesion is injected from the die bonding surface, it is not necessary to move the injection device and the device becomes simple.

In the second embodiment shown in FIG. 3, the core 60 is slidably attached to the tie bar 564.
Although it is designed to be inserted and withdrawn between the female dies 63 and 64, the orthogonal robot is provided on the base 51 or the fixed plate 52, and the orthogonal robot is provided with the cores 65 and 66.
It is also possible to make 5, 66 move in and out between the female dies 63, 64.

[0023]

As described above, according to the present invention, the core disk is moved in and out of the movable disk in the direction parallel to the advancing / retracting direction of the movable plate and in the direction perpendicular thereto, so that the structure is simple. , Mold alignment accuracy can be easily maintained, and molds can be easily replaced and modified. Further, by guiding the tie bar, the above effect can be obtained with a simpler structure.

[Brief description of drawings]

1A and 1B show an injection molding machine according to a first embodiment of the present invention, FIG. 1A is a side view, and FIG. 1B is a view of a central portion viewed in an axial direction.

2A and 2B show the operation of the injection molding machine shown in FIG. 1, where FIG. 2A is a side sectional view when forming a half-molded product, and FIG. 2B is a side sectional view when joining and welding.

FIG. 3 is a side view of an injection molding machine according to a second embodiment of the present invention.

FIG. 4 is a side sectional view of a conventional injection molding machine, (A)
Is a diagram before molding, (B) is a diagram of half-molded product formation, (C)
Is a diagram in which the mold is opened, and (D) is a diagram of bonding and welding.

[Explanation of symbols]

51: base, 52, 53: fixed plate, 54: tie bar,
55: movable plate, 56: mold clamping cylinder, 57: injection device, 58: core plate moving frame, 59: core plate advancing and retracting cylinder, 60: core plate, 61: core plate rotating cylinder, 6
2: core stopper, 63, 64: female mold, 65, 6
6: male mold, 67, 68, 69, 70, 71, 72: resin passage, 73, 74: open / close valve, 76c, 77c: cavity, 76, 77: half molded product, 78: peripheral space portion,
90: rails, 91: sliders, 562: rams (pistons), 564: mold clamping tie bars, 564s: threaded irregularities, 568: screw-shaped parts.

Claims (3)

[Claims] 1. In an injection molding machine for forming a hollow molded product by joining a split product molded by a female mold and a male mold by secondary molding, a nozzle of an injection device is brought into contact with an outer side of the base. One of the female molds is attached to the inside of the fixed plate provided in the, and the other female mold is attached to the one of the female molds facing the fixed plate, which is moved forward and backward by the driving means. Driving means in a direction parallel to the moving platen moving direction and a direction perpendicular to the moving platen so that a core plate having male molds corresponding to the molds attached back to back can be inserted / removed between the female molds. An injection molding machine, which is provided so as to be moved by. 2. In an injection molding machine for forming a hollow molded product by joining a two-divided product molded by a female mold and a male mold by secondary molding, a nozzle of an injection device is brought into contact with the outer side of the injection molding machine. One of the female molds is attached to the inside of the fixed plate provided in the. Installed, the cores with the male molds corresponding to these female molds attached back to back are guided by the tie bars so as to be inserted / removed between the female molds and parallel to the moving direction of the movable plate. An injection molding machine characterized in that it is provided so as to be moved by a driving means in a normal direction and a direction perpendicular thereto. 3. A fixed plate fixedly mounted on the base so as to face each other,
A tie bar connecting the two fixed plates, an injection device provided outside one of the fixed plates, and a mold clamping cylinder fixedly mounted on the other fixed plate are driven to move back and forth guided by the tie bars. The movable platen, the female dies attached to the inside of the movable plate and the inside of the one fixed plate, respectively, facing each other, and guided by the tie bar so as to be inserted and removed between the female dies. Injection molding consisting of a core plate provided to be moved by a driving means in a direction parallel to the advancing / retracting direction of the movable plate and a direction perpendicular thereto, and a male mold mounted back to back on the core plate. Machine.