JP2011148155A - Method of manufacturing resin-made hollow molded article and device therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method capable of efficiently integrally molding a lightweight and rigid resin-made hollow molded article having various sectional shapes which cannot be molded with an extrusion molding device, and the device therefor. <P>SOLUTION: In the method of manufacturing the resin-made hollow molded article and the device therefor, a thermoplastic molten resin is introduced from one end of the space which is formed between the peripheral surface of an insert slider which is inserted in a cavity formed in the inner part of clamped pair of molds so as to be able to advance and retreat, and the molding mold surface of the mold. After the filling of the molten resin in the space is completed, the insert slider is extracted to the outside, and afterward, the hollow molded article formed in the cavity is carried out by opening the mold. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method and apparatus for manufacturing a resin hollow molded article, and more particularly to a method and apparatus for manufacturing a resin hollow molded article that cannot be molded by an extrusion molding apparatus.

  Conventionally, for example, as shown in FIG. 8, a long resin hollow formed integrally with a hinge support HJ on a part of the back and formed with an opening OP for connecting other parts to the front and rear ends. When manufacturing a molded product, use a mold that molds the resin plate material on the front side that constitutes the resin hollow molded product and a mold that integrally molds the hinge support on the resin plate material on the back side. In addition, the process of joining the molded resin plate materials at both ends and the step of providing openings at the front and rear ends of the resin plate material on the back side are indispensable and suitable for mass production. In addition, not only does the manufacturing cost increase, but there is a problem that defective products are generated due to incomplete joining of both resin plate materials.

  In the technical field of this type of injection molding apparatus, as disclosed in the following patent document, a plurality of insert members positioned inside a pair of cavities formed in a pair of clamped molds are used. There has been proposed an injection molding apparatus for producing a resin molded product in which a molten resin is injected and introduced with the insert member embedded therein while being held by a holding pin. However, according to these patent documents, no suggestion can be obtained in manufacturing the hollow resin molded product having the above-described form.

JP-A-10-290726 JP 11-207749 A JP 2003-170467 A

  The main object of the present invention is to provide a manufacturing method and apparatus capable of efficiently integrally molding light and rigid resin hollow molded products having various cross-sectional shapes that cannot be molded by an extrusion molding apparatus under the above-described conventional technology. It is to provide.

  In order to achieve this object, the present invention provides a peripheral surface of an insert slider positioned so as to be able to advance and retreat in a cavity formed in a pair of clamped molds and a molding surface of both the molds. A thermoplastic molten resin is introduced into a space formed between the ends of the space, and after the filling of the molten resin into the space is completed, the insert slider is pulled out, and then the mold A method of manufacturing a resin hollow molded product is devised in which the hollow molded product molded in the cavity is carried out by opening the.

  In one embodiment of the present invention, an insert slider which is inserted and positioned so as to be able to advance and retreat in a cavity formed in a pair of molds clamped, and the insert slider is positioned at a predetermined position in the cavity. Holding thermoplastic resin in the space formed between the peripheral surface of the insert slider and the molding surfaces of the two molds in a state where the insert slider is held by the holding means. A resin introduction means for introducing from one end of the space, and when the introduction of the molten resin into the space is completed, the insert slider is extracted outside, and then the mold is opened to enter the cavity. An apparatus for producing a hollow resin molded product is provided, in which the molded hollow molded product is carried out.

  Further, in another embodiment of the present invention, one mold facing the back surface of an insert slider positioned so as to be able to advance and retreat in a cavity formed inside a pair of molds clamped A thermoplastic molten resin is placed in the space formed between the peripheral surface of the insert slider and the molding surfaces of the two molds while being held in place by a plurality of holding pins protruding reversibly from the molding surface. When introduced from one end of the space, the molten resin is controlled to be introduced into the space on the front side of the insert slider ahead of the space on the back side of the insert slider, and the space on the back side of the insert slider is controlled. When the molten resin is introduced into the space, the holding pins are sequentially retracted to complete the filling of the molten resin into the space. Withdrawn insert location slider to the outside, after which the mold release to the resin hollow molded article manufacturing apparatus that carries out the hollow resin molded article molded by the cavity is provided.

  Furthermore, in another embodiment of the present invention, a fixed mold installed vertically, a movable mold installed vertically so as to be able to advance and retreat facing the fixed mold, and both the molds are clamped. An insert slider which is inserted into the cavity to be formed so as to be movable back and forth in the vertical direction along the molding surface of the movable mold and positioned at a predetermined position; and the insert slider is positioned in the cavity. Heat is applied to the space formed between the peripheral surface of the insert slider and the molding surfaces of the two molds while being held by a plurality of holding pins protruding from the molding surface of the movable mold facing the back surface. As the molten resin is introduced upward from the lower end of the space and the molten resin is introduced into the space on the back side of the insert slider, the holding pins are sequentially retracted, When filling of the molten resin into the pace is completed, the insert slider is pulled out, and then the movable mold is released from the fixed mold to form a hollow resin molded product molded in the cavity. An apparatus for producing a resinous hollow molded article to be carried out is provided.

  In this embodiment, when the thermoplastic molten resin is introduced upward from the lower end of the space into the space formed between the peripheral surface of the insert slider and the molding surfaces of the two molds, the molten resin is It is desirable to control so that the space on the front side of the insert slider is introduced prior to the space on the back side of the insert slider. In this case, the holding pins are sequentially retreated in a state where the insert slider is pressed to the back side by the molten resin introduced prior to the front side and held straight by the holding pins. A hollow resin molded product having a uniform thickness can be accurately produced.

  In this embodiment, when the movable mold is in the released state, when the movable mold is clamped to the fixed mold after the insert slider descends and reaches the lower end, the insert slider is moved to both sides. It is desirable to be positioned within a cavity formed within the mold. In this case, an internal pressure generated at the time of introducing the molten resin into the cavity is provided by providing an engaging portion that engages with the end surface of the fixed die at the upper end of the insert slider when the movable die is clamped. Therefore, the upward movement of the insert slider can be reliably regulated.

  Furthermore, in one embodiment of the present invention, a fixed mold provided with a molding surface for forming the surface of the molded product, a movable mold provided with a molding surface for forming the back surface of the molded product, and the fixed An insert slider which is inserted and positioned so as to be able to advance and retreat in a cavity formed between the molding surfaces of both molds in a state where the movable mold is clamped to the mold, and the movable mold or the fixed mold A plurality of holding pins which are incorporated so that they can be projected and retracted on the molding surface of the same mold and protrude when the insert slider is positioned in the cavity, and hold the back surface of the insert slider, and these holding pins respectively. A drive mechanism that presses and protrudes into the cavity; and the holding pin is compressed when it protrudes into the cavity by the operation of the drive mechanism. A plurality of urging means for retreating the holding pins when the pressure is released, and urging the inner end surfaces of the holding pins so as to be positioned in the same plane as the molding surface of the mold; and the movable mold When the insert slider is clamped to the fixed mold and the insert slider is positioned in the cavity, the drive mechanism is operated to press the holding pin against the action of the urging means to insert the insert slider. First control means for controlling the operation of the drive mechanism such that the back surface of the insert slider is held at a predetermined position by the holding pin, and the back surface of the insert slider is held by the holding pin in the cavity. Resin introduction hand that injects thermoplastic molten resin from one end of the space into the space formed between the peripheral surface of the insert slider and the molding surfaces of both molds And a second control means for controlling the resin introduction means so that the molten resin is introduced into a space formed on the front side of the insert slider ahead of a space on the back side of the insert slider, and the insert Actuation of the drive mechanism so that the operation of the drive mechanism is sequentially released as the molten resin is introduced into the space formed on the back side of the slider, and the holding pins are sequentially retracted by the biasing means. And a third control means for controlling the mold, and when the molten resin has been filled into the space, the insert slider is withdrawn to the outside, and then the movable mold is released from the fixed mold to release the cavity. An apparatus for producing a hollow resin molded product is provided which is adapted to carry out a hollow resin molded product molded in a tee.

  In the above embodiment, when a long plate-like insert member having a predetermined width is adopted as the insert slider, a long resin hollow flap having both ends opened in the cavity can be manufactured. . In carrying out the present invention, the holding pins are respectively fitted in a plurality of stepped holes provided in the movable mold so as to be positioned along the back surface of the insert slider so as to be able to advance and retract. The holding pins are urged in the retreating direction by a plurality of coil springs respectively housed in the stepped holes as urging means, and when the pressing force due to the operation of the drive mechanism is sequentially released, the holding pins retreat and the Corresponding to the holding pin on the back side of the hollow resin molded product molded in the cavity by configuring the inner end surface to be fixed on the same surface as the molding surface of the movable mold It can be finished beautifully without causing unevenness.

  In the method and apparatus for producing a resin hollow molded product according to the present invention, the following specific effects can be obtained.

  (1) Filling the space formed between the peripheral surface of the insert slider, which is inserted into the cavities in the pair of clamped molds and positioned, and the molding surfaces of the two molds with a molten resin Since the hollow molded product is molded, for example, when a hinge support is integrally formed on a part of the back surface of the resin hollow molded product and openings are formed on both ends of the back surface, By providing a concave part corresponding to the support part and a convex part corresponding to the opening part on the molding surface of the mold facing the back surface of the insert slider, it is possible to efficiently produce a resin hollow molded product that cannot be molded by an extrusion molding device. can do. Similarly, when a protrusion or opening is formed integrally on a part of the front surface or back surface of a product, a mold having a recess or protrusion corresponding to the protrusion or opening formed on the molding surface is clamped. If it is employed in either one of the pair of molds, a hollow resin molded product having a desired form can be easily produced.

  (2) As an insert slider that is inserted and positioned in a pair of mold-clamped dies, insert members with various cross-sectional shapes and lengths can be used to form hollows with various cross-sectional shapes and lengths. It is possible to provide a light and rigid resin hollow molded product having a portion.

  (3) Molding the peripheral surface of the insert slider and both molds in a state where the insert slider is held at a predetermined position by a plurality of holding pins projecting reversibly from the molding surface of one mold facing the back side. When the molten resin is introduced from one end of the space formed between the surfaces, the molten resin is introduced prior to the space on the front side of the insert slider and is introduced behind the space on the back side of the insert slider. In such a case, the insert slider is pushed to the back side by the molten resin introduced prior to the front side thereof and is held straight by the holding pin, so that the hollow resin molded product having a uniform thickness Can be produced accurately.

  (4) When the molten resin is introduced to the back side of the insert slider, the holding pins are sequentially retracted so that the inner end surface thereof is fixed on the same surface as the molding surface of the mold. Can be finished beautifully so as not to cause irregularities corresponding to the holding pins on the back surface of the resin hollow molded product.

The schematic block diagram of the injection molding apparatus of the resin-made hollow molding products by this invention, FIG. 1 is a front view of the fixed mold shown in FIG. FIG. 1 is a front view of the movable mold shown in FIG. The longitudinal cross-sectional view which shows the state in which the insert slider positioned in the cavity formed in the inside of both metal mold | die shown in FIG. 1 was hold | maintained with the holding pin assembled | attached to the movable metal mold | die, FIG. 3 is an enlarged cross-sectional view taken along line AA in FIG. FIG. 3 is an enlarged cross-sectional view taken along line BB in FIG. FIG. 3 is a vertical view of a gate for introducing a molten resin into a space formed around the insert slider shown in FIG. FIG. 4 is a longitudinal sectional view of a modification of the gate shown in FIG. FIG. 4 is a longitudinal sectional view of another modified example of the gate shown in FIG. The flowchart of the control program performed by the controller provided in the control box of the injection molding apparatus shown in FIG. The figure which shows the operating state of the injection molding apparatus shown in FIG. The figure which shows the operating state of the injection molding apparatus shown in FIG. The figure which shows the operating state of the injection molding apparatus shown in FIG. The figure which shows the operating state of the injection molding apparatus shown in FIG. The figure which shows the operating state of the injection molding apparatus shown in FIG. The figure which shows the operating state of the injection molding apparatus shown in FIG. The perspective view of the resin-made hollow molded products manufactured with the injection molding apparatus shown in FIG. A perspective view of a resin hollow molded product that can be manufactured by the injection molding apparatus of the present invention, A perspective view of a resin hollow molded product that can be manufactured by the injection molding apparatus of the present invention, The perspective view of the resinous hollow molded product which it is going to manufacture with the injection molding apparatus of this invention.

  Hereinafter, an embodiment of an injection molding apparatus for a resin hollow molding product according to the present invention will be described in detail with reference to the accompanying drawings. As shown in FIGS. 1, 2A, 2B, and 3, the injection molding apparatus in this embodiment includes a fixed mold 10 provided with a molding surface 11 that forms the surface of the molded product, and the molded product of the molded product. It is formed between the molding surfaces 11 and 21 of both molds 10 and 20 in a state where the movable mold 20 provided with the molding surface 21 forming the back surface and the movable mold 20 is clamped to the fixed mold 10. The insert slider 30 is inserted into the cavity R (see FIG. 3) and positioned from above so as to be movable back and forth, and the insert slider 30 is inserted into the movable mold 20 so as to be able to protrude and retract on the molding surface of the mold. A plurality of holding pins 40 that protrude when positioned in the tee R and hold the back surface of the insert slider 30 in place, and a plurality of drives that press the holding pins 40 and protrude into the cavity R, respectively. Mechanism 5 When the holding pin 40 protrudes into the cavity R due to the operation of the drive mechanism 50 and is compressed and when the pressing force due to the operation of the drive mechanism 50 is released, the holding pin 40 is retracted and each inner end face thereof is There is provided a biasing means 41 (see FIG. 3) for biasing the movable mold 20 so as to be fixed on the same surface as the molding surface of the movable mold 20, and the back surface of the insert slider 30 in the cavity R is provided. The space S1 and S2 (see FIG. 4) formed between the peripheral surface of the insert slider 30 and the molding surfaces 11 and 21 of both molds 10 and 20 while being held by the holding pins 40 are thermoplastic. A gate G for injecting molten resin (HIPS: impact-resistant polystyrene) by injecting it from the lower ends of the spaces S1, S2 is provided. In this injection molding apparatus, the opening / closing operation of the movable mold 20, the raising / lowering operation of the insert slider 30, the operation of the drive mechanism of the holding pin 40, and the operation of introducing the molten resin are described later by the controller 70 </ b> A provided in the control box 70. Controlled as follows.

  As shown in FIG. 2A, a molding surface 11 for forming the surface of the molded product is provided vertically at the center of the fixed mold 10, and convex portions are integrated on both sides of the molded product on the molding surface 11. A pair of left and right recesses 12 are provided. Similarly, as shown in FIG. 2B, a molding surface 21 that forms the back surface of the molded product is provided vertically at the center of the movable mold 20, and the molding surface 21 has a recess 12 on the molding surface 11. Corresponding pairs of left and right recesses 22 are provided. The insert slider 30 is attached to a piston rod 61 of a hydraulic cylinder 60 assembled to a machine frame located at the upper end of the movable mold 20. The insert slider 30 is positioned between the molding surfaces facing the peripheral surface in a state where the insert slider 30 is positioned in the cavity R formed inside the molds 10 and 20 which are clamped. The width and the thickness are determined so that the spaces S1 and S2 that define the distance are formed. (See FIGS. 3A and 3B) In this embodiment, when the movable mold 20 is in the released state, the movable mold 20 is moved to the fixed mold 10 after the insert slider 30 is lowered and reaches the lower end. When the mold is clamped, it is desirable that the insert slider 30 be positioned in a cavity R formed in both molds. In this case, an engagement portion (not shown) that engages with the end surface of the fixed die 10 when the movable die 20 is clamped is provided at the upper end portion of the insert slider 30, thereby entering the cavity R. The upward movement of the insert slider 30 due to the internal pressure generated when the molten resin is injected can be reliably regulated.

  As shown in FIG. 3B, the driving mechanism 50 of the holding pin 40 includes air cylinders A <b> 1 to A <b> 5 that drive the cam rod 51 formed with a cam surface 51 a that engages the rear end of each holding pin 40. In this drive mechanism 50, when the air cylinders A1 to A5 are activated under the control of a controller 70A in a control box 70 to be described later, each cam rod 51 slides in the lateral direction and the convex portion of the cam surface 51a of the cam rod. Thus, each holding pin 40 is pushed.

  As shown in FIG. 3B, each holding pin 40 is fitted in a plurality of stepped holes 41 provided in the movable mold 20 so as to be able to advance and retract, and is urged in a backward direction by a coil spring 42. When the air cylinders A1 to A5 are activated, they protrude from the molding surface 21 of the movable mold 20 against the coil spring 42 by engagement with the convex portion of the cam rod 51, and the operations of the air cylinders A1 to A5 are released. The rear end engages with the concave portion of the cam rod 51 and the inner end surface thereof is fixed so as to be located on the same plane as the molding surface of the movable mold 20. Note that the stepped hole 41 into which each holding pin 40 is fitted has the inner end thereof so that the back surface of the insert slider 30 is uniformly held at a predetermined position by the inner end when the holding pin 40 protrudes from the molding surface 21 of the movable mold 20. It is arranged so that. (See Figure 2B)

  The molten resin introduced into the cavity R formed by the molding surfaces 11 and 21 of the clamped molds 10 and 20 is operated by the injection cylinder 80 shown in FIG. ) And is introduced into the gate G. As shown in FIG. 4, the gate G is connected to a first inflow path G1 communicating with a space S1 formed on the front surface side of the insert slider 30 and a second space S2 formed on the back surface side of the insert slider 30. An inflow channel G2 is provided. The second inflow channel G2 is provided with a throttle portion Th formed in the middle thereof, and this throttle portion Th functions to delay the flow of the molten resin introduced into the space S2. As shown in FIGS. 4A and 4B, the throttle portion Th may be provided by fitting a throttle member Gb having a through hole with an appropriate inner diameter into an annular groove Ga provided in the second inflow channel G2. Good. In this case, the function of the diaphragm portion Th can be adjusted by appropriately replacing the diaphragm member Gb.

The controller 70A provided in the control box 70 includes sensors D ₁ and D ₂ for detecting the forward end and the backward end of the hydraulic cylinder 60; sensors for detecting the forward end and the reverse end of the air cylinders A1 to A5, respectively (not shown). And in response to the detection signal given from the encoder 81 attached to the injection cylinder 80 of molten resin, the control program shown by the flowchart in FIG. 5 is executed.

  At the time of starting the injection molding apparatus, the controller 70A starts executing the control program in step S100 in the flowchart of FIG. 5 with the movable mold 20 opened (see FIG. 6A). To output control signals for controlling the operations of the hydraulic cylinder 60, the movable die drive device (not shown), the air cylinders A1 to A5, and the injection cylinder 80, respectively.

Thus, when the control program proceeds to step S101, a control signal for starting the hydraulic cylinder 60 is output, the hydraulic cylinder 60 is started by this control signal to lower the insert slider 30, and the lowering operation is performed in step S102. judge. When the piston rod of the hydraulic cylinder 60 reaches the forward end in response to the detection signal of the sensor D ₁ outputs a stop signal, insert the slider 30 by the hydraulic cylinder 60 is stopped is positioned at its lowermost position by the stop signal The

  Next, when the control program proceeds to step S103, a control signal for activating the air cylinders A1 to A5 is output. The air cylinders A1 to A5 are activated all at once by this control signal, and each holding pin 40 is connected to the cam rod 51. It protrudes from the molding surface 21 of the movable mold 20 by sliding in the lateral direction. After that, in step 104, a control signal for starting a driving device (not shown) for the movable mold 20 is output, and the movable mold 20 is directed toward the fixed mold 10 by the operation of the driving device by this control signal. After moving, the molds 10 and 20 are clamped. At this time, the insert slider 30 previously positioned at its lower end is held at a predetermined position by the holding pin 40 in the cavity R formed by clamping the molds 10 and 20. (See FIG. 6B.) When an engaging portion that engages with the end face of the fixture 10 is provided at the upper end of the insert slider 30, the insert slider is moved to its upper end when the molds 10, 20 are clamped. The upward movement is restricted by engaging with the end face of the fixed mold 10 by the engaging portion provided in the portion.

When it is detected in step S105 that the molds 10 and 20 have been clamped, a control signal for driving the molten resin injection cylinder 80 is output in step 106, and the injection cylinder 80 is activated by this control signal. Molten resin supplied from a resin supply machine (not shown) is introduced into the spaces S1 and S2 formed on the front side and the back side of the insert slider 30 through the gate G. At this time, since the molten resin supplied through the second inflow path G2 of the gate G is squeezed by the throttling portion Th and introduced into the space S2, the molten resin supplied to the gate G first has the first inflow path G1. And is introduced into the space S1 through the second inflow channel G2 after being introduced into the space S1. For this reason, the insert slider 30 is pressed against the holding pin 40 by the molten resin flowing into the space S1 and held straight. (See Figure 6C)
When the molten resin is introduced into the space S1 and the space S2 in the molten resin injection process, the state of the molten resin introduced into the cavity R is changed to the step S107 by the encoder 81 attached to the injection cylinder 80. The air cylinders A1 to A5 are sequentially released from operation in response to the detection signal. As a result, as the molten resin introduced into the space S <b> 2 rises, the holding pins 40 are sequentially retracted by the repulsive force of each coil spring 42. At this time, the backward movement of the holding pins 40 is detected in step S108, and all the holding pins 40 are positioned at the backward ends so that the front end surfaces thereof are located on the same surface as the molding surface 21 of the movable mold 20. (See Figure 6D)

Thus, when the introduction of the molten resin into the cavity R is completed, the thick molded articles defined by the spaces S1 and S2 are molded in the cavities of both molds 10 and 20 that are clamped. At this time, the completion of the introduction of the molten resin is detected by the encoder 81 of the injection cylinder 80 in step S109. In response to this detection signal, “Yes” is determined in step S109, and the movable metal is detected in step S120. A control signal for starting the driving device of the mold 20 is output. In response to this control signal, the movable mold 20 is opened by the activation of the driving device to release the molded product molded in the cavity R, and in the middle of releasing the movable mold 20, in step S121. Outputs a stop signal. (See FIG. 6E) When the drive device of the movable mold 20 is temporarily stopped by this stop signal, a control signal for retracting the hydraulic cylinder 60 is output in step S122, and the hydraulic cylinder 60 is retracted by this control signal. Then, the insert slider 30 is raised, and this raising operation is determined in step S123. The piston rod of the hydraulic cylinder 60 in response to the detection signal of the sensor D ₂ reaches the retreat end outputs a stop signal, insert the slider 30 by the hydraulic cylinder 60 is stopped is fixed to its upper end by the stop signal . (See FIG. 6F) Thereby, the insert slider 30 is pulled out from the molded product molded in the cavity R, and the molded product is carried out of the machine as a desired resin hollow molded product. Thereafter, in step S124, a control signal for restarting the driving device of the movable mold 20 is output. In response to the control signal, the movable mold 20 is opened by restarting the driving device, and in step S125. It is determined whether or not the opening operation of the movable mold 20 is completed, and when it is determined as “Yes”, the control program is returned to the first step S101, and the control program described above in the molding process of the next article to be molded. Repeat the execution.

  In carrying out the present invention, not only the above-described embodiments but also various configurations as described below can be adopted, and these embodiments are included in the technical protection scope of the present invention. Should be understood.

  (1) An insert slider that is inserted and positioned in a cavity formed inside a pair of clamped molds has an appropriate cross-sectional shape in order to give the molded product the necessary rigidity. May be implemented.

  (2) When producing a long resin hollow molded product, the insert slider in the above embodiment is inserted into the cavity formed inside the pair of molds clamped from above and below. A pair of positioned insert members may be employed. In this case, when the insert member inserted from above and the insert member inserted from below are positioned in the cavity, the inner ends of both insert members If a space into which the molten resin flows is formed, appropriate ribs can be integrally formed at the center of the molded product.

  (3) A vertical molding surface having a semicircular cross section is formed on one of a pair of molds, and a flat molding surface corresponding to the molding surface is formed on the other mold, so that the insert slider has a cross section. When a semicircular insert member is employed, a resin hollow molded product as shown in FIG. 7A can be molded. Further, a horizontal molding surface perpendicular to the vertical molding surface is formed on one of the pair of molds, and a molding surface corresponding to these molding surfaces is formed on the other mold, and both molds are molded. When an insert slider that is inserted and positioned along a molding surface perpendicular to the L-shaped cavity formed when tightened and an insert slider that is inserted and positioned along a horizontal molding surface are employed, An L-shaped resin hollow molding product as shown in FIG. 7B can be molded.

  (4) In addition, the molding surfaces of both molds should be changed according to the form of the product to be molded.

10 .. Fixed mold, 20 .. Movable mold, 11, 21 .. Molding surface, 30 .. Insert slider, 40 .. Holding pin, 41 .. Energizing means, 50. Hydraulic cylinder, 70A ・ ・ Controller, R ・ Cavity, S1, S2 ・ ・ Space

Claims (10)

  An insert slider is inserted in a cavity formed inside a pair of molds clamped so as to be able to move forward and backward, and positioned between the peripheral surface of the positioned insert slider and the molding surfaces of both molds. A thermoplastic molten resin is introduced into one space from one end of the space, and after the filling of the molten resin into the space is completed, the insert slider is pulled out, and then the mold is opened. A method for manufacturing a resin hollow molded product in which a hollow molded product molded in the cavity is carried out by the above-described method. An insert slider that is inserted and positioned so as to be able to advance and retreat in a cavity formed in a pair of molds clamped;
Holding means for holding the insert slider at a predetermined position in the cavity;
Resin that introduces thermoplastic molten resin from one end of the space into the space formed between the peripheral surface of the insert slider and the molding surfaces of the molds in a state where the insert slider is held by the holding means. An introduction means,
Resin designed to take out the insert slider to the outside when the introduction of the molten resin into the space is completed, and then to carry out the hollow molded product molded in the cavity by opening the mold Manufacturing equipment for hollow molded products.   The insert slider is inserted in a cavity formed inside a pair of clamped molds so that the insert slider can be moved back and forth, and the positioned insert slider can be retracted from the molding surface of one mold facing the back. A thermoplastic molten resin is introduced from one end of the space into a space formed between the peripheral surface of the insert slider and the molding surfaces of both molds while being held at a predetermined position by a plurality of holding pins protruding to The molten resin is controlled so that the molten resin is introduced into the space on the front side of the insert slider ahead of the space on the back side of the insert slider, and the molten resin is introduced into the space on the back side of the insert slider. In response, the holding pins are sequentially retracted to allow the introduction of the molten resin, and the molten resin is introduced into the space. When the filling is completed, the insert slider is withdrawn to the outside, and then the mold is released to carry out a hollow resin molded product molded in the cavity. .   As means for introducing the molten resin into the space on the front side of the insert slider ahead of the space on the back side of the insert slider, a throttle portion is provided in the gate for introducing the molten resin into the space on the back side of the insert slider. The apparatus for producing a resinous hollow molded article according to claim 3. A fixed mold installed vertically, a movable mold installed vertically so as to be able to advance and retreat against the fixed mold, and molding of the movable mold in a cavity formed by clamping the two molds An insert slider that is inserted in a vertically movable manner along the surface and positioned at a predetermined position;
In a state where the insert slider is positioned in the cavity and is held by a plurality of holding pins protruding from the molding surface of the movable mold facing the back surface thereof, the peripheral surface of the insert slider and the both molds are A thermoplastic molten resin is introduced upward from the lower end of the space into the space formed between the molding surfaces, and the holding pin is moved in response to the molten resin being introduced into the space on the back side of the insert slider. Retract one after another to allow introduction of the molten resin, and when the filling of the molten resin into the space is completed, the insert slider is pulled out, and then the movable mold is released from the fixed mold and the An apparatus for producing a resinous hollow molded product which carries out a hollow resin molded product molded in a cavity. A fixed mold installed vertically, a movable mold installed vertically so as to be able to advance and retreat against the fixed mold, and molding of the movable mold in a cavity formed by clamping the two molds An insert slider that is inserted in a vertically movable manner along the surface and positioned at a predetermined position;
In a state where the insert slider is positioned in the cavity and is held by a plurality of holding pins protruding from the molding surface of the movable mold facing the back surface thereof, the peripheral surface of the insert slider and the both molds are When the thermoplastic molten resin is introduced upward from the lower end of the space into the space formed between the molding surfaces, the molten resin precedes the space on the front side of the insert slider before the space on the back side of the insert slider. The molten resin is controlled so that the molten resin is introduced into the space on the back side of the insert slider, and the holding pins are sequentially retracted to allow the molten resin to be introduced. When the molten resin is completely filled, the insert slider is pulled out, and then the movable mold is moved to the fixed mold. Releasing the resin hollow molded article manufacturing apparatus that carries out the molded hollow molded resin product in the said Kyabitei from. A fixed mold provided with a molding surface for forming the surface of the molded product;
A movable mold provided with a molding surface for forming the back surface of the molded article;
An insert slider that is inserted and positioned so as to be able to advance and retreat in a cavity formed between the molding surfaces of both molds in a state where the movable mold is clamped to the fixed mold;
A plurality of holding pins which are incorporated into the movable mold or the fixed mold so as to be able to protrude and retract on the molding surface of the mold and project when the insert slider is positioned in the cavity to hold the back surface of the insert slider; ,
A driving mechanism that presses each of these holding pins to project into the cavity,
When the holding pin protrudes into the cavity by the operation of the driving mechanism, the holding pin is compressed and when the pressing force due to the operation of the driving mechanism is released, the holding pin is retracted, and each inner end surface of the holding pin is of the mold. A plurality of biasing means for biasing so as to be fixed on the same surface as the molding surface;
When the movable mold is clamped to the fixed mold and the insert slider is positioned in the cavity, the drive mechanism is operated to press the holding pin against the action of the biasing means. First control means for controlling the operation of the drive mechanism so that the insert slider is held at a predetermined position by the holding pin on the back surface thereof;
A thermoplastic molten resin is placed in a space formed between the peripheral surface of the insert slider and the molding surfaces of both molds in a state where the back surface of the insert slider is held by the holding pin in the cavity. A resin introduction means for injecting and introducing from one end of the space;
As the molten resin is introduced into the space formed on the back side of the insert slider, the operation of the drive mechanism is released and the holding pins are sequentially retracted by the biasing means to introduce the molten resin. Second control means for controlling the operation of the drive mechanism so as to allow
When filling of the molten resin into the space is completed, the insert slider is pulled out, and then the movable mold is released from the fixed mold to form a hollow resin molded product molded in the cavity. An apparatus for manufacturing a resin hollow molded product which is to be carried out. A fixed mold provided with a molding surface for forming the surface of the molded product;
A movable mold provided with a molding surface for forming the back surface of the molded article;
An insert slider that is inserted and positioned so as to be able to advance and retreat in a cavity formed between the molding surfaces of both molds in a state where the movable mold is clamped to the fixed mold;
A plurality of holding pins which are incorporated into the movable mold or the fixed mold so as to be able to protrude and retract on the molding surface of the mold and project when the insert slider is positioned in the cavity to hold the back surface of the insert slider; ,
A driving mechanism that presses each of these holding pins to project into the cavity,
When the holding pin protrudes into the cavity by the operation of the driving mechanism, the holding pin is compressed and when the pressing force due to the operation of the driving mechanism is released, the holding pin is retracted, and each inner end surface of the holding pin is of the mold. A plurality of biasing means for biasing so as to be fixed on the same surface as the molding surface;
When the movable mold is clamped to the fixed mold and the insert slider is positioned in the cavity, the drive mechanism is operated to press the holding pin against the action of the biasing means. First control means for controlling the operation of the drive mechanism so that the insert slider is held at a predetermined position by the holding pin on the back surface thereof;
A thermoplastic molten resin is placed in a space formed between the peripheral surface of the insert slider and the molding surfaces of both molds in a state where the back surface of the insert slider is held by the holding pin in the cavity. A resin introduction means for injecting and introducing from one end of the space;
Second control means for controlling the operation of the resin introducing means so that the molten resin is introduced into a space formed on the front side of the insert slider ahead of a space on the back side of the insert slider;
As the molten resin is introduced into the space formed on the back side of the insert slider, the operation of the drive mechanism is released and the holding pins are sequentially retracted by the biasing means to introduce the molten resin. And third control means for controlling the operation of the drive mechanism so as to allow
When filling of the molten resin into the space is completed, the insert slider is pulled out, and then the movable mold is released from the fixed mold to form a hollow resin molded product molded in the cavity. An apparatus for manufacturing a resin hollow molded product which is to be carried out.   The holding pins are respectively fitted in a plurality of stepped holes provided in the movable mold so as to be positioned along the back surface of the insert slider so as to be able to advance and retreat, and the step as the plurality of urging means. The holding pins are urged in the retreating direction by a plurality of coil springs respectively housed in the attachment holes, and when the pressing force due to the operation of the drive mechanism is sequentially released, the holding pins retreat and the inner end surfaces thereof are movable. The apparatus for manufacturing a resin hollow molded product according to claim 7 or 8, wherein the device is fixed on the same surface as the molding surface of the mold.   An insert made of a long plate-like member having a predetermined width is adopted as the insert slider, and a resin hollow flap having both ends opened in the cavity is molded. The manufacturing apparatus of the resin-made hollow molded products of any one of 2-9.

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