JP4679977B2 - Resin molding machine and resin molding method - Google Patents

Description

  The present invention relates to a resin molding machine and a resin molding method for molding a resin molded product such as expanded polystyrene or plastic.

  Conventionally, in a resin molding machine in which a molded product is formed in a sealed space sandwiched between a pair of molds, one mold is fixed to a base, and the other mold is moved to move between the molds. Are fastened to form a sealed space (see, for example, Patent Document 1).

JP 2001-129622 A

  However, when the other mold is moved while one mold is fixed, it is necessary to move the mold with high precision, resulting in an increase in cost.

A resin molding machine according to the present invention is a resin molding machine having a pair of upper and lower upper and lower molds, an upper mold support means for supporting the upper mold, a lower mold support means for supporting the lower mold, and an upper mold support. comprising a lifting means for lifting one of means and the lower die support means, and by raising the lowering or the lower die support means upper mold support means by the lifting means, the upper die abuts against the upper portion of the lower die by being spaced apart and the upper die and the upper die support means is to support the upper and lower molds the lower mold supporting means, further, the resin molding machine, an upper die placed lower mold and thereon Fastening means for fastening the upper die and the lower die integrally so as to form a sealed space between them, heating and pressurizing means for heating and pressurizing the sealed space in a state where a resin material is sealed in the sealed space, and fastening means Thermal deformation in the outer peripheral direction with reference to the center of the mold fastened by Characterized in that it comprises a regulating means for regulating the position of the upper and lower molds to so that.
An air layer forming means is further provided for forming an air layer between the lower mold and the resin molded product so that the resin molded product is released from the lower mold while the fastening by the fastening means is released. Is preferred.
A rise prevention means for preventing the upper mold from being raised by the air pressure when the air layer is formed by the air layer forming means can be further provided.
You may make it further provide the mold release means which presses down the resin molded product closely_contact | adhered to the upper mold | type, and releases from an upper mold | type.
A resin molding machine according to the present invention is a resin molding machine having a pair of upper and lower upper and lower molds, an upper mold support means for supporting the upper mold, a lower mold support means for supporting the lower mold, and an upper mold support. comprising a lifting means for lifting one of means and the lower die support means, and by raising the lowering or the lower die support means upper mold support means by the lifting means, the upper die abuts against the upper portion of the lower die by being spaced apart and the upper die and the upper die support means is to support the upper and lower molds the lower mold supporting means, further, the resin molding machine, an upper die placed lower mold and thereon Fastening means for fastening the upper mold and the lower mold integrally so as to form a sealed space between them, a heating and pressurizing means for heating and pressurizing the sealed space in a state where a resin material is sealed in the sealed space, and an upper mold Cooling water supply means for supplying cooling water to each of the lower mold and the lower mold. And characterized in that the drain passage for draining the cooling water supplied to the lower mold is placed in the lower mold within the container provided.
The resin molding method according to the present invention lowers the upper mold or raises the lower mold in a state where the upper and lower upper and lower molds are individually supported by the upper mold supporting means and the lower mold supporting means, respectively. step and a step of supporting the upper and lower molds by the lower mold support means the upper mold is spaced and the upper die support means and the upper die abuts against the upper portion of the lower mold, the lower mold and the upper mold to To form a sealed space in the interior, to form a resin molded product by heating and pressurizing the sealed space with the resin material sealed in the sealed space, and then to the upper mold and the lower mold And a step of forming an air layer between the lower mold and the resin molded product so that the resin molded product is released from the lower mold while the fastening is released.

  According to the present invention, the molds are fastened together with the upper mold placed on the upper part of the lower mold, and resin molding is performed. Therefore, it is not necessary to strictly control the position of the mold in the height direction, and the manufacturing is performed. Cost can be reduced.

Hereinafter, an embodiment of a resin molding machine according to the present invention will be described with reference to FIGS.
FIG. 1 is a front view showing the overall configuration of the resin molding machine according to the present embodiment. The resin molding machine in FIG. 1 is a so-called vertical molding machine in which a mold is divided in the vertical direction, and has a pair of upper and lower molds 1 (an upper mold 100 and a lower mold 200).

  The lower mold 200 is placed on the base plate 2, and the support frame 3 is installed on both sides of the base plate 2. The support frame 3 is provided with a support plate 4 for supporting the upper die 100, a column 5 is erected below the support plate 4, and the upper portion of the upper die 100 is open. The base plate 2 is supported along the column 5 so as to be movable up and down from the support frame 3. The molds 100 and 200 include mold bodies 101 and 201 and mold containers 102 and 202 to which the mold bodies 101 and 201 are attached (see FIG. 7).

  The upper mold 100 and the lower mold 200 are clamped by a plurality of fasteners 6 (only a part of which is shown) provided on the peripheral edge thereof. In this state, the lower end surface of the upper die 100 is in close contact with the upper end surface of the lower die 200 to form a sealed space therein, and a molded product MD made of, for example, polystyrene foam is formed in the sealed space. In the figure, the molded product MD is shown in an arc shape, but the molded product MD may have any shape.

  2 and 3 are cross-sectional views of the main part of FIG. 1, FIG. 4 is a plan view of the upper mold (mold container 102) 100, and FIG. 5 is a plan view of the base plate 2 and the lower mold 200 (mold container 202). is there. 2 shows a state where the base plate 2 is lowered, and FIG. 3 shows a state where the base plate 2 is raised. In FIG. 5, the base plate 2 is indicated by a solid line, and the lower mold 200 is indicated by a dotted line.

  As shown in FIGS. 3 and 5, on the upper surface of the base plate 2, three positioning pins 21 to 23 are erected on a straight line L <b> 1 through the center portion of the base plate 2. Among these, the center pin 22 (center pin) is provided at the center of the base plate 2, and a circular recess 212 is provided at the center of the bottom surface of the lower mold 200 corresponding to the center pin 22. The center pin 22 is fitted in the recess 212, and the horizontal position of the center portion of the lower mold 200 is regulated.

  On the other hand, the pins 21 and 23 are provided at symmetrical positions with respect to the center pin 22, and slit-like recesses 211 and 213 are provided along the straight line L 1 on the bottom surface of the lower mold 200 corresponding to the pins 21 and 23. It has been. As a result, the pins 21 and 23 are fitted into the recesses 211 and 213 in a state where the lower mold 200 is placed on the base plate 2, and the lower mold 200 can be thermally deformed along the pins 21 and 23 in the horizontal direction. That is, thermal expansion and thermal contraction (thermal expansion) in the outer peripheral direction of the lower mold 200 with respect to the center pin 22 are allowed. In FIG. 5, 7 is a ball screw erected in parallel with the column 5. The ball screw 7 is rotated by a motor (not shown), and the base plate 2 is moved up and down by the rotation of the ball screw 7.

  As shown in FIGS. 2 and 4, support brackets 103 are provided at both ends of the upper mold 100. In FIG. 2, the bracket 103 abuts on the upper surface of the support plate 4, and the upper mold 100 is held by the support plate 4. ing. Further, on the upper surface of the support plate 4, three pins 41 to 43 are erected on three sides around the upper mold 100, and positioning brackets are respectively provided on the side edges of the upper mold 100 corresponding to the pins 41 to 43. 104 is provided.

  As shown in FIGS. 3 and 4, slit-like through holes 111 to 113 are opened in each bracket 104 along straight lines L <b> 2 and L <b> 3 that pass through the center portion P <b> 1 of the upper mold 100. Each of the pins 41 to 43 passes therethrough. Accordingly, the upper mold 100 can be thermally deformed in the horizontal direction along the pins 41 to 43, and thermal expansion and contraction in the outer peripheral direction of the upper mold 100 with respect to the center portion P1 are allowed. In addition, the center part P1 of the upper mold | type 100 corresponds with the position of the center part (recessed part 212) of the lower mold | type 200. FIG. The pins 41 to 43 are inserted into the through holes 111 to 113 even when the upper mold 100 is raised, and also function as guide pins that regulate the position of the upper mold 100.

  A pressing cylinder 8 that presses the upper surface of the bracket 103 is provided above the bracket 103. As a result, as will be described later, the upper mold 100 is prevented from rising when the release air is blown out. FIG. 6 is an enlarged view of the bracket 103 of FIG. The corner portion of the bottom surface of the bracket 103 is formed in a tapered shape (tapered surface 103a), and a wedge-shaped movable plate 9 is installed on the side of the bracket 103 along the tapered surface 103a. The movable plate 9 is movable along the upper surface of the support plate 4 in the direction of the arrow in FIG. 6A, and the bracket 103 is in contact with the tapered surface as shown in FIG. 6B. Is pressed by the pressing cylinder 8. Thus, the upper mold 100 is held on the support plate 4 at the height position at the time of molding.

  FIG. 7A is a diagram mainly showing the internal configuration of the mold 1. As shown in the figure, the upper mold 100 and the lower mold 200 include mold bodies 101 and 201 and mold containers 102 and 202 that cover the periphery thereof. A large number of steam holes 110 and 210 are opened on the surfaces of the mold main bodies 101 and 201 so as to face the sealed space SP, and high-temperature and high-pressure steam is shown in the space SP through the steam holes 110 and 210 as indicated by arrows in the drawing. And the resin filled in the sealed space SP is foam-molded. After foam molding, through a cooling process, the upper and lower molds are released from each other, the upper mold 100 is held by the support plate 4, and then release air having a temperature lower than that of the steam is ejected from the steam holes 210 of the lower mold 200. . With this release air, an air layer 300 is formed below as shown in FIG. 7B, and the foam molded product MD is released from the lower mold 100.

  As shown in FIG. 7B, the steam hole 110 of the upper mold 100 is formed in a stepped shape, and the diameter of the steam hole 110 is larger on the mold surface side. Thereby, the adhesiveness of the metal mold body 101 and the molded product MD is increased. A piston 120 that can expand and contract between the steam holes 110 is disposed on the surface of the upper mold 100, and the molded product MD that is in close contact with the upper mold 100 can be released by the downward movement of the piston 120.

  Referring to FIG. 7, spaces 130 and 230 for injecting cooling water are formed in the upper mold 100 and the lower mold 200, and the cooling water is supplied into the spaces 130 and 230, and the mold main bodies 101 and 201. Is cooled. A drain hose 240 is connected to the lower mold container 202. Since the mold container 202 is formed in a concave shape, the cooling water sprayed in the space 130 is received by the lower mold container 202 and drained through the drain hose 240 together with the cooling water sprayed in the space 230. Is done.

Next, the manufacturing process of a foam molded product will be described.
(1) Raising the lower mold First, as shown in FIG. 2, the lower mold 200 is set on the base plate 2, and the upper mold 100 (the bracket 103) is set on the support plate 4. In this state, the ball screw 7 is rotationally driven in one direction, and the base plate 2 is raised together with the lower mold 200. As a result, as shown in FIG. 3, the upper end surface of the lower die 200 and the lower end surface of the upper die 100 come into contact with each other, and the lower die 200 is raised at a position (molding position) where the upper die 100 is lifted a predetermined amount from the support plate 4. Stop. In this state, the upper mold 100 and the lower mold 200 are clamped by the fastener 6, and a sealed space SP is formed between the upper mold 100 and the lower mold 200.

  In this case, the upper die 100 is placed on the support plate 4 and supported so as to be movable upward, and the upper die 100 is raised together with the upper die 100 placed on the lower die 200. There is no need to strictly control the position of the mold 200 (the amount of upward movement). On the other hand, if the upper mold 100 is supported so as not to move upward, an excessive load is applied to the contact surface between the upper mold 100 and the lower mold 200 if the amount of upward movement of the lower mold 200 is too large. The seal surface may be deformed. On the other hand, if the amount of upward movement of the lower mold 200 is insufficient, a gap is formed between the upper mold 100 and the lower mold 200, so that it takes time to clamp. Therefore, when the upper mold 100 is supported so as not to move upward, it is necessary to strictly control the position of the lower mold 200, which complicates the configuration and increases the cost.

(2) Foam Molding Next, resin beads, which are a foam material, are filled into the sealed space SP, and high temperature and high pressure are supplied from the steam holes 110 and 210 on the surfaces of the upper mold 100 and the lower mold 200 as shown in FIG. And the foamed beads in the space SP are heated. As a result, the foam beads are ruptured, and a foam molded product along the shape of the mold 1 is formed. At this time, the temperature of the mold 1 rises, the lower mold 200 (slit-shaped recesses 211 and 213) thermally expands along the pins 21 and 23, and the upper mold 100 (slit-shaped through holes 111 to 113) It thermally expands along 41-43. As a result, the lower mold 200 and the upper mold 100 are equally thermally expanded with respect to the center pin 22, and the upper mold 100 can be prevented from being displaced with respect to the lower mold 200.

  In this case, since the resin molding machine is a vertical molding machine including a pair of upper and lower molds 1 extending in the horizontal direction, the temperature distribution of the upper mold 100 and the lower mold 200 is small, and the molds 100 and 200 are in the horizontal direction. The molded product MD can be accurately molded. On the other hand, in the case of a horizontal molding machine extending in the vertical direction, the temperature of the upper part of the mold tends to be higher than the temperature of the lower part, the temperature distribution of the mold 1 becomes large, and the mold 1 is heated evenly. Difficult to inflate. This tendency is particularly noticeable when molding a large molded product having a length in the longitudinal direction of several meters or more (for example, a resin-made assembly-type house), and it is difficult to accurately mold the molded product MD. .

(3) Cooling When the foam molding process is completed, the steam is stopped, cooling water is injected into the inner spaces 130 and 230 of the molds 100 and 200, and the molds 100 and 200 are cooled. The injected cooling water is collected in the mold container 202 and discharged through the drain hose 240. Therefore, drainage paths can be combined into one, and the configuration is easy.

(4) Mold release When cooling of the mold 1 is completed, the movable plate 9 is inserted between the bracket 103 of the upper mold 100 and the support plate 4 as shown in FIG. Next, the pressing cylinder 8 is extended downward to press the upper surface of the bracket 103. As a result, the bracket 103 is held between the pressing cylinder 8 and the movable plate 9, and the upper mold 100 is fixed on the support plate 4.

  In this state, the fastener 6 is removed, the upper mold 100 is released from the lower mold 200, and release air is blown out from the steam holes 210 of the lower mold 200 as shown in FIG. Thereby, an air layer 300 is formed between the lower mold 200 and the molded product MD, and the molded product MD is released from the lower mold 200 while being in close contact with the upper mold 100. At this time, the upper die 100 is prevented from rising by the pressing cylinder 8. Since the steam hole 110 on the upper mold surface is formed in a stepped shape, the adhesion between the upper mold 100 and the molded product MD is high, and the lower mold 200 and the molded product MD when the release air is blown are used. Is easy to release.

(5) Lowering of the lower die Thereafter, the ball screw 7 is rotationally driven in the opposite direction, and the base plate 2 is lowered together with the lower die 200. At this time, the molded product MD is held in close contact with the upper mold 100. When the lower mold 200 is lowered, the cooling water of the upper mold 100 is dripped. However, since this cooling water is received by the mold container 202, it is possible to prevent the cooling water from being scattered on the floor surface.

  When the lower mold 200 is lowered, the upper mold 100 is held on the support plate 4 as shown in FIG. In this state, when a transfer robot or forklift arm is inserted between the upper and lower molds and the piston 120 of the upper mold 100 is extended, the molded product MD is released from the surface of the upper mold 100 and dropped onto the robot arm or the like. To do. The molded product MD is taken out by a robot or the like, and a series of manufacturing steps is completed.

According to the above embodiment, the following effects can be obtained.
(1) Since the lower mold 200 is raised with the upper mold 100 placed on the support plate 4 and the upper mold 100 is placed on the lower mold 20, both are clamped. Without strictly controlling the upward movement of the mold 100, the molds 100 and 200 can be easily clamped, and the manufacturing cost can be reduced.

(2) The center portion of the lower die 200 is positioned by the center pin 22, slit-like recesses 211 and 213 are provided at the side end portion of the lower die 200, and the slit-like through hole 111 is provided at the side end portion of the upper die 100. ˜113 are opened so that the molds 100, 200 can be thermally deformed along the pins 21, 23, 41-43. Thereby, the upper mold | type 100 and the lower mold | type 200 can be thermally expanded uniformly, and the molded product MD can be shape | molded accurately.
(3) Since the vertical resin molding machine is used, the temperature distribution of the mold is small, and the mold can be uniformly thermally deformed.

(4) Since the release air is supplied from the lower mold 200 and the air layer 300 is formed between the lower mold 200 and the molded product MD, the adhesive state between the upper mold 100 and the molded product MD is maintained. Molded product MD can be easily released from lower mold 200.
(5) Since the upper surface of the bracket 103 of the upper mold 100 is pressed by the pressing cylinder 8 when blowing the release air, the upper mold 100 can be prevented from being lifted by air pressure.
(6) Since the wedge-shaped movable plate 9 is inserted between the bracket 103 and the support plate 4, the bracket 103 can be reliably pressed by the pressing cylinder 8 while being separated from the support plate 4.

(7) Since the molded product MD is released from the upper mold 100 by the extension of the piston after the lower mold 200 is lowered while the molded product MD is in close contact with the upper mold 100, the mold can be easily released from the upper mold 100. is there.
(8) Since the cooling water sprayed onto the molds 100 and 200 is received by the lower mold container 202 and drained through the drain hose 240, the cooling water is scattered on the floor surface when the lower mold 200 is separated from the upper mold 100. Can be prevented. Further, the drainage paths can be combined into one, and the configuration can be simplified.

  In the above embodiment, the lower mold 200 is moved and the upper mold 100 is placed on the lower mold 200, but the upper mold 100 is moved and moved onto the lower mold 200 as shown in FIG. The upper mold 100 may be placed. That is, the support plate 4 may be moved up and down along the column 5. Also in this case, it is preferable to regulate the positions of the molds 100 and 200 so that the molds 100 and 200 thermally expand in the outer peripheral direction with the center as a reference.

  In the above, the lower mold 200 is moved up and down by the ball screw 7, but other lifting means such as a hydraulic cylinder may be used. The upper mold 100 is placed on the support plate 4, and the upper mold 100 is placed on the lower mold 200 by raising the lower mold 200. If it supports so that it may mount, it is not restricted to this. Although the molds 100 and 200 are clamped by the fastener 6, other fastening means may be used. The molded product MD is formed by blowing high-temperature and high-pressure steam from the steam holes 110 and 210 of the mold, but any configuration of the heating and pressing means may be used. Although the thermal deformation of the molds 100 and 200 is regulated by the pins 21 to 23 and 41 to 43, the regulation means is not limited to this as long as the thermal deformation is regulated in the outer peripheral direction with the central portion as a reference.

  Although air is blown from the vapor hole 210 of the lower mold 200 to form the air layer 300 between the lower mold 200 and the molded product MD, the air layer forming means is not limited to this. When the molded product MD is securely held by the upper mold 100 at the time of mold release, or when the molded product MD is held on the lower mold 200 and taken out, release air is unnecessary. The bracket 103 of the upper mold 100 is pressed by the pressing cylinder 8 to prevent the upper mold 100 from rising, but the rise prevention means is not limited to this. Although the molded product MD is released from the upper die 100 by the extension operation of the piston 120, the releasing means is not limited to this. Although cooling water is supplied to the internal spaces 130 and 230 of the molds 100 and 200, any internal structure of the molds 100 and 200 may be used.

  In the said embodiment, although the example which shape | molds a foaming molded product was shown, other resin molded products, such as an injection molded product, can also be shape | molded similarly. That is, the present invention is not limited to the resin molding machine of the embodiment as long as the features and functions of the present invention can be realized. In addition, the above description is an example to the last, and when interpreting invention, it is not limited or restrained at all by the correspondence of the description matter of the said embodiment, and the description matter of a claim.

The front view which shows schematic structure of the resin molding machine which concerns on embodiment of this invention. It is a principal part sectional drawing of FIG. 1, and is a figure which shows the state which the lower mold | type fell. It is principal part sectional drawing of FIG. 1, and is a figure which shows the state which the lower mold | type rose. The top view of the upper mold | type of FIG. FIG. 2 is a plan view of a base plate and a lower mold in FIG. 1. FIG. 3A is an enlarged view of an end of the upper mold of FIG. 2, and FIG. (A) is a figure which shows the internal structure of a metal mold | die, (b) is the principal part enlarged view. The figure which shows the modification of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold 2 Base plate 4 Support plate 6 Fastener 7 Ball screw 8 Press cylinder 9 Movable plates 21, 23, 41-43 Pin 22 Center pin 100 Upper mold 111-113 Through hole 200 Lower mold 211-213 Recess

Claims (6)

A resin molding machine having a pair of upper and lower upper and lower molds ,
Upper mold support means for supporting the upper mold;
Lower mold support means for supporting the lower mold;
And a lifting means for lifting one of said upper die support means and bottom supporting means,
By lowering the upper mold support means or raising the lower mold support means by the elevating means, the upper mold is brought into contact with the upper part of the lower mold and the upper mold and the upper mold support means are separated from each other. the Rukoto, wherein the lower mold support means supporting the upper and lower molds,
Furthermore, the resin molding machine includes a fastening unit that integrally fastens the upper mold and the lower mold so as to form a sealed space between the lower mold and the upper mold placed on the upper mold.
A heating and pressurizing means for heating and pressurizing the inside of the sealed space with a resin material sealed in the sealed space;
And a restricting means for restricting the positions of the upper mold and the lower mold so as to allow thermal deformation in the outer circumferential direction with reference to the center portion of the mold fastened by the fastening means. Resin molding machine. In the resin molding machine according to claim 1,
Air layer forming means for forming an air layer between the lower mold and the resin molded product so that the resin molded product is released from the lower mold while the fastening by the fastening means is released, while being in close contact with the upper mold. A resin molding machine further comprising: In the resin molding machine according to claim 2,
A resin molding machine, further comprising a rise prevention means for preventing the upper mold from being raised by air pressure when an air layer is formed by the air layer forming means. In the resin molding machine according to claim 2,
A resin molding machine further comprising mold release means for pressing the resin molded product in close contact with the upper mold downward to release it from the upper mold. A resin molding machine having a pair of upper and lower upper and lower molds,
Upper mold support means for supporting the upper mold;
Lower mold support means for supporting the lower mold;
Elevating means for elevating or lowering either one of the upper mold supporting means and the lower mold supporting means ,
By lowering the upper mold support means or raising the lower mold support means by the elevating means, the upper mold is brought into contact with the upper part of the lower mold and the upper mold and the upper mold support means are separated from each other. the Rukoto, wherein the lower mold support means supporting the upper and lower molds,
Furthermore, the resin molding machine includes a fastening unit that integrally fastens the upper mold and the lower mold so as to form a sealed space between the lower mold and the upper mold placed on the upper mold.
A heating and pressurizing means for heating and pressurizing the inside of the sealed space with a resin material sealed in the sealed space;
Cooling water supply means for supplying cooling water to each of the upper mold and the lower mold,
The lower mold is installed in a lower mold container provided with a drainage passage for draining the cooling water supplied to the upper mold and the lower mold. Lowering the upper mold or raising the lower mold in a state where the upper and lower upper molds and the lower mold are individually supported by the upper mold support means and the lower mold support means, respectively,
The upper mold is brought into contact with the upper part of the lower mold, the upper mold supporting means and the upper mold are separated, and the lower mold supporting means supports the lower mold and the upper mold;
Fastening the lower mold and the upper mold to form a sealed space inside;
Forming a resin molded product by heating and pressurizing the inside of the sealed space with the resin material sealed in the sealed space; and
Thereafter, an air layer is formed between the lower mold and the resin molded product so that the resin molded product is released from the lower mold while being in close contact with the upper mold in a state in which the fastening between the upper mold and the lower mold is released. And a forming step .

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