JP3195270U - Reactive resin horizontal mold press - Google Patents

Abstract

Kind Code: A1 The present invention relates to a reactive polymer mixture that is used to produce other foamed products directed to various fields and that is adapted to a high degree of automation using a relatively low mold pressure and a structurally simple press. A horizontal mold press is provided. A press includes a base frame having a horizontally extending longitudinal axis, and a side end of a first mold member or a front support plate is firmly fixed to one end of the base frame. Meanwhile, the second mold member 14 is movable along the upper and lower horizontal tie rods (16A and 16B), and is firmly attached to the front support plate 12 for the first mold member 13 and the other end of the frame 11. It is supported by a fixed intermediate plate 15 that extends between the rear or side end plate 17. The slide guide 18 is provided on the frame 11 below the lower tie rod 16B that supports the movable plate 15 so as to guide the movable plate 15, and prevents the tie rods 16A and 16B from being bent or accidentally worn. [Selection] Figure 1

Description

  The present invention relates to a horizontal press suitable for molding foamed products from a reactive polymer mixture obtained by mixing a plurality of chemically reactive liquid components such as polyol and isocyanate, for example, polyurethane resin.

  In particular, the present invention relates to a horizontal press for manufacturing a drive wheel for a vehicle using a mold having a recess. The mold recess matches the complex design of the drive wheel or mold product. In fact, the press according to the present invention is used to produce other foamed products aimed at various fields and is adapted to a high degree of automation using a relatively low mold pressure and a structurally simple press. It is necessary to let

  Horizontal presses are widely used for plastic injection molds. In this field, molten thermoplastic material is injected at high pressure into mold cavities. This type of press includes a first fixed plate that supports a first half mold and is slidably fixed along a base frame, and a second movable plate that supports a second half mold. In a press, one of the plates is provided with a sturdy tie rod suitable for releasable engagement, locking the member to the other plate. This type of press is exemplified in Patent Document 1, Patent Document 2, and Patent Document 3.

  Other types of presses are also used in the field of molten thermoplastic resin injection molding. Further, one movable support plate of the two half molds is located between the fixed support plate of the other half mold and the support counter plate for the actuator, and is disclosed in Patent Document 4, Patent Document 5, and Patent Document 6. As illustrated, it is firmly connected to the fixed plate by four sturdy horizontal columns.

  This type of press is a complex and rugged structure that is necessary for injecting highly viscous molten thermoplastic material and is suitable for withstanding the high pressures in the mold. Furthermore, it is difficult to automate the loading or reduction of the load on the molded product and to access the inner surface of the half mold. In automated equipment, large columns and rod connections between plates of the press make it difficult to access the area sandwiched between the two half molds.

  Furthermore, in a mold that molds molten thermoplastic resin, the mold is intricately designed with a mold recess, and in order to distribute the molten mass of the material equally, injection from the side to the center parallel to the longitudinal axis extending in the longitudinal direction of the mold To do.

  Pressurized injection technology of molten thermoplastics causes air and gas bubbles and imperfections in the molded product, so the chemical reaction that accumulates between the injection dent and the surface of the mold product is advanced, and the air in the mold It is not suitable for the use of foamed liquid polymer resins which are subject to the RIM technology (Reaction Injection Molding) from the liquid mixture of chemical reactants and gas properties.

  With the known RIM technology, the pressure generated in a closed mold by expansion of the resin from the liquid mixture of chemical reaction components to the mold of the foamed resin product, for example in the field of polyurethane resins, is required in the injection mold of thermoplastic material A press which is considerably smaller than what is assumed and is usually structurally simple is used. For example, in the manufacture of vehicle drive wheels, obtained by foaming a polyurethane resin suitable for forming a film on the surface, the metal frame is proactively incorporated into two opposing half mold cavities. Inject resin.

  This type of press is illustrated in FIGS. 4 to 7 of Patent Document 7, Patent Document 8, and Patent Document 9. This type of press relates to the vertical opening and closing movement of the mold, as clearly shown in the previously cited literature, and usually refers to the vertical press. The two half molds and the resulting mold recess are placed in a horizontal plane.

U.S. Pat. No. 4,874,309 US Pat. No. 6,250,905 Japanese Patent No. 4,169,554 US Pat. No. 5,252,286 US Pat. No. 5,773,049 International Publication No. WO98 / 19850 US Pat. No. 5,540,576 Japanese Patent No. 58,209,535 European Patent No. 0,461,522

  In this type of vertical press, today's technology includes in the extractor manual die cutting of the foam drive wheel after the foam drive wheel has been removed from the lower half mold. After removing the drive wheel die cuts and burrs, the available coloring or release agent is sprayed into the mold dents and the operator must manually clean and prepare the new drive wheel manufacturing mold. The operator then inserts a new drive wheel reinforced metal frame while allowing a press closure and subsequent injection cycle of the polyurethane mixture.

  This type of press generally requires removal of the finished product and cleaning and preparation of the two half molds, making it difficult to operate in an automated state as a whole. Also, the press requires a large overall size and is structurally complex, making it difficult for humans and automated systems to remove the mold product or inserted insert and access the two half molds. The same is true when using an automated system that cleans and prepares the concave surface of the mold.

  According to RIM technology, vertical presses for molding foamed products have further problems with the horizontal arrangement of the two half molds and the injection of the reactive liquid mixture into the mold closure recess.

In fact, as is known from various references, the reactive liquid mixture is injected substantially from one side of the mold onto a horizontal plane that coincides with the contact surfaces of the two half molds. Thus, air and reaction gases that expand into the mold cavity during the expansion of the reactive mixture tend to remain trapped between the expansion bubble and the mold cavity surface, particularly in a complex design mold. Air or gas bubbles that adhere to the mold inner surface and have no air passages cause surface or structural defects formed in the mold product.
(Purpose of the invention)

  An object of the present invention is to provide a mold press for a foamed polymer resin product obtained from a liquid mixture of chemically reactive polymer components suitable for use with RIM technology. This technique is an extremely simplified structure that allows a human or robotic operator to easily access the work area formed between the two members of the mold.

  A further object of the present invention is to provide a press for molding a product made of a foamed polymer resin as described above. Here, the generation and sticking of air bubbles or reaction gas inside the recess of the mold is reduced and removed with the help of natural ventilation.

  Another object of the present invention is the combination of a foamed polymer resin, a press that molds the product of the chemical component dosing and mixing device, and a possible additive for the liquid mixture to be transported to an extremely limited size mold Providing an integrated device that can be easily moved to different work areas and contained in an optimal container.

The above is accomplished in a foamed resin horizontal mold press by injecting a reactive liquid mixture of first and at least second polymer components into the recessed shape of the first and at least second mold members.
This mold press
A base frame having a longitudinal axis extending in the longitudinal direction;
A first fixed support plate for a first mold member extending along a vertical plane arranged perpendicular to the longitudinal axis of the base frame;
A second movable plate for supporting a second mold member disposed in parallel with the second mold member;
At least a pair of guide rods for a movable plate extending between a first fixed plate arranged in parallel to the longitudinal axis of the base frame and a counter plate fixed to the base frame;
A linear actuator operably connected to the movable plate, configured for opening and closing of the mold, initial load of the press, and locking pressure of the two mold members in the closed state of the mold.
In another aspect of the present invention, a horizontal mold press is provided to produce a foam product, and a base frame having the front and rear shafts,
A first and second vertically extending side plates fixed to the base frame, which are arranged perpendicular to the front and rear axes of the base frame, and parallel to the front and rear axes of the base frame between the front and rear or side end plates. An extended side tie rod or side end plate; and a third intermediate plate supported movably between the side end plates of the mold press;
An actuator operably connected to the intermediate plate for moving the intermediate plate between the first forward closed position and the retracted open position of the mold;
The injection gate comprises an injection gate for injecting the mixture, which is composed of slits oriented in a vertical plane so as to inject the reactive liquid mixture upward from the bottom of the recess of the mold.
The tie rod can be placed in the lateral direction and kept at such a distance as to remove the mold product from the top, and can be fixed or moored to the side end plate, so that the insert can be inserted or the mold The two members are cleaned or prepared.
According to one embodiment, the press comprises a plurality of side tie rods at the top and bottom corners that are diagonally opposed to the side end plate.
Here, the tie rod is firmly fixed to the side end plate, or at least one upper tie rod is slidably supported by one of the side end plates, and a forward state in which the side end plate is firmly connected; An actuator is movably connected between the retracted positions with respect to the side end support plate. As a result, a selectively actuable control actuator is provided that manufactures an intermediate plate, upper tie rod, or tie rod for advancement or retraction with synchronous interlocking.
These and further features of the horizontal press according to the present invention will be apparent from the following description and the accompanying drawings.

FIG. 1 is a perspective view of a press in a closed state in the first embodiment. FIG. 2 is a side view of the press of FIG. 1 in the closed state. FIG. 3 is a side view similar to FIG. 2 with the upper tie rod advanced in the open state of the press. FIG. 4 is a side view similar to FIG. 3 at the position where the upper tie rod is retracted. FIG. 5 shows details of the locking device for the movable tie rod. FIG. 6 is a cross-sectional view of the mold in the closed state. FIG. 7 is a view of one of the two members of the mold based on the line 7-7 in FIG. FIG. 8 shows the second solution of the press with the combined feed and dose polymer components. FIG. 9 shows a third solution of the press combined with a device for the supply and administration polymer component.

  1 and 5, the press 10 includes a base frame 11 having a horizontally extending front and rear shaft, and a side end of the first mold member 13 or a front support plate 12 is firmly attached to one end of the base frame 11. Fixed. Meanwhile, the second mold member 14 is movable along the upper and lower horizontal tie rods (16A and 16B), and is firmly attached to the front support plate 12 for the first mold member 13 and the other end of the frame 11. It is supported by a fixed intermediate plate 15 that extends between the rear or side end plate 17.

  The slide guide 18 is provided on the frame 11 below the lower tie rod 16B that supports the movable plate 15 so as to guide the movable plate 15, and prevents the tie rods 16A and 16B from being bent or accidentally worn.

  Furthermore, as shown in the embodiment, the movable plate 15 is provided with four sleeves 15 'that slide along the upper tie rod 16A and the lower tie rod 16B.

  When the situation is displayed, the two lower tie rods 16B are firmly attached to the plates 12 and 17. On the other hand, as shown in the drawing, the two upper tie rods 16A are movably supported by a rear plate 17 that is slidable in the longitudinal direction between the forward position in FIGS. 1 to 3 and the retracted position in FIG.

  For this purpose, each slidable upper tie rod 16A is operatively connected to a respective linear actuator 19 that, for example, constitutes a hydraulic or electric cylinder that extends behind the plate 17.

  As shown in detail in FIG. 5, each movable tie rod 16 </ b> A reaches a tapered head 16 </ b> C passing through each hole at the corner of the front plate 12 and engages with a lock member 21 fixed to the front side of the front plate 12. The locking member 21 can be configured in any manner, and includes, for example, a slide 22 that is movable in a vertical direction within a guide 22 ′ and is operatively connected to a linear actuator 23. The slide 22 has an open slot 24 that engages the tapered head 16C of the tie rod 16A.

  The press 10 includes a linear actuator that drives the movable plate 15 between the advanced closed position of the two mold members 13 and 14 shown in FIGS. 1 and 2 and the retracted open position shown in FIGS. 25 is provided. The linear actuator 25 can be mechanically or electrically locked in the closed state of the mold in order to apply an initial load to the press and maintain the pressure of the two mold members locked in the closed position.

  The control actuator 25 of the movable plate 16 can be configured in any manner, and may be in any form. In that case, the actuator 25 consists of an air cylinder fixed behind the plate 17 by two shelves 25A, and the actuator 25 is in turn functionally connected to the movable plate 15 by a double toggle device 26. For example, in the type shown in FIG. 2, prior to feeding the reactive polymer mixture, the entire structure of the press is preloaded and the movable plate 15 is mechanically locked to the stationary plate 12 in the closed state of the molds 13, 14. To do.

  As shown in the embodiment, the actuator 25 is composed of an air cylinder, but the actuator 25 can be in any form, for example, hydraulically or electrically. In particular, a direct acting motor that supplies the control tongue so as to maintain it in the vicinity of the mold or a gear motor with braking can be used. The toggle 26 is connected in a linear motion between the actuator 25 and the movable intermediate plate 15, and may be in other forms or may be eliminated as a whole.

  6 and 7, the features of the horizontal press according to the present invention will be disclosed below. That is, although the mold is configured to manufacture a vehicle drive wheel, the mold recess is configured differently from manufacturing a foam product, regardless of the illustrated embodiment.

  In the case of a drive wheel, the two members 13, 14 of the mold form an annular recess 30 arranged in a vertical plane, and as is known per se, the metal armature is connected to the central hub by means of spokes. Arranged to form a ring, the peripheral ring, spokes, and part of the central hub are suitable for forming foam material, eg polyurethane foam or surface film, after being placed in the mold recess Coated with other polymer materials.

  A liquid polymer mixture consisting of first and at least second components chemically reactive with a suitable foam or colorant is, for example, one lower end of two mold members, for example the movable mold member 13. Then, it is injected into the mold recess 30 by the high-pressure mixing device 31 positioned parallel to the horizontal axis of the mold.

  6 and 7, in a horizontal mold press, the mold recess 30 extends in a vertical plane that coincides with the contact surface between the two mold members 13, 14 in the closed state of FIG.

  The mixing device 31 is connected to a mold recess 30 by a supply path 33 and an injection gate 34 that gradually diffuses upward from the bottom side of the mold recess 30 to the narrow slit for injecting the reactive polymer mixture. Connect in order.

  In experimental testing, the horizontal press of the disclosed mold has various advantages in the special vertical arrangement of the mold recess and the injection gate of the reactive liquid mixture in the case of a foamed polymer material mold product, It has been virtually confirmed.

  In particular, the horizontal arrangement of the press, which is the axis of the mold, and the connection of the two side plates by a movable or fixed peripheral tie rod at an appropriate distance makes the operation of the mold particularly easy. In particular, mold preparatory work and mold product insertion and removal arrangements are easily accessible to the press work area with the mold open, both by human operators and machines.

  In addition, the vertical arrangement of the mold recess 30 allows the reactive polymer mixture injection gate to be directed to the vertical plane while feeding the mixture upward from the bottom side of the recess 30. Therefore, the special vertical arrangement of the mold recess and injection gate allows the reactive mixture to be injected from the bottom to the top, and as a result, the rise of bubbles is caused by gas generated during the air or chemical reaction from the mold. Facilitates ventilation. In this way, air and gas bubbles are dragged upward and exhausted through the ventilation openings, preventing the formation of structurally and aesthetically defective mold products.

  The remaining FIGS. 8 and 9 show two other possible solutions that do not affect the general characteristics of the press.

  FIG. 8 differs from FIGS. 1-4 in that the movable plate 15 simply has two tie rods, an upper tie rod 16A slidable at the corner of the plate of the press, and its diagonally opposite corners. It is slidable along the lower tie rod 16B, and two lower guides are additionally provided on the base frame 11 as much as possible. To illustrate the situation, the lower tie rod 16B is fixed, but the upper tie rod 16A is movable in the axial direction as in the previous case. The diagonally located tie rods 16A and 16B can all be fixed at an appropriate distance and can approach the working area contained between the two members 13, 14 of the mold.

  In FIG. 8, the same reference numerals in the previous drawings are used to indicate similar or equivalent parts, and the actuator 25 of the movable plate 15 is a screw gear or a pneumatic or hydraulic actuator shown in FIGS. It consists of a reactor that replaces

  Further, FIG. 8 shows a combination of the press 10 and a device for supplying and administering the reactive polymer component to the mixing device 31. A device 28 for dispensing and supplying the polymer component is supported by the main frame 24, where the base frame 11 of the press is located and is removably attached. In this way, the entire assembly of press 10 and dosing device 28 can be removed and transported in a suitable container.

  FIG. 9 shows a different solution from FIG. 8 in which the locking toggle device 26 is removed and the screw-type electric actuator 25 is directly connected to the movable plate 15. In this case, the sealing of the press, the initial load on the structure, and the pressure locking toggle of the two mold members 13 and 14 are possible by holding the electric motor of the screw type actuator 25 in the operating state.

  Referring to FIGS. 1 to 5, a press operation constituted by a movable upper guide rod from the closed position of the press shown in FIG. 1 is disclosed. In this state, the two upper tie rods 16 </ b> A are in the advanced state attached to the front fixing plate 12 by the lock devices 21. Further, in FIG. 1, the movable plate 15 is in an advanced state in which the two mold members 13 and 14 are pushed to the closed position by the linear actuator 25 and by the toggle lever device 20. Therefore, in these states, the liquid polymer mixture can be supplied vertically and upward from the bottom side of the mold recess 30 by the high-pressure mixing head 31.

  From the viewpoint of the vertical arrangement at the bottom of the mold and the ejection gate 34, the mixture rises in a bubble, so that air and gas bubbles in the mold recess are drawn out and discharged.

  The polymer mixture should be removed after the reaction reaches a degree of polymerization. Therefore, as shown in FIG. 3, the movable plate 15 moves to open the two mold members 13, 14, and thus retracts to the rear plate 17 by being continuously operated by the control actuator 19. When the upper tie rod is movable, the upper tie rod 16A is retracted after the lock device 21 is released. Therefore, the press has an open structure as shown in FIG. 4, and the area between the two members 13 and 14 is configured to remove the molded product and perform cleaning and preparation of the mold in the subsequent molding process. It can be freely accessed from one or more sides by human or machine operation. The press is closed again by selectively and continuously actuating the control actuator.

  From the point mentioned and shown in the example of the drawing, the extremely simplified horizontal press offers a high degree of automation and speed in the operations required to remove the part and clean and prepare the mold. It should be appreciated that the easy access to the work area that allows, the tool can be inserted.

Claims (11)

A base frame (11) having a longitudinal axis extending longitudinally;
A first support plate (12) of a first mold member (13) fixed to the base frame, extending in a vertical plane arranged perpendicular to the longitudinal axis of the base frame (11);
A second movable support plate (15) for a second mold member (14) parallel to the above;
The movable plate, which extends between the first fixed plate (12) and the counter plate (17) fixed to the base frame (11) and is arranged in parallel to the front and rear axes of the base frame (11). (15) at least a pair of guide tie rods (16);
The movable plate (15) is configured to control opening and closing of the mold, apply an initial load to the press, and lock the pressure on the two mold members (13, 14) when the mold is closed. A horizontal mold press (10) suitable for producing foamed products of reactive polymer material, comprising an operably connected linear actuator (25). The mold member (13, 14) is positioned with a vertically oriented outlet slit positioned such that a reactive mixture is injected upward from the bottom side of the recess of the mold member (13, 14). Comprising an injection gate (34) of the mixture,
Suitable for molding foamed resin by injecting a reactive liquid mixture of first and at least second polymer components into a recess (30) between the first and second mold members (13, 14). The horizontal mold press (10) according to claim 1.   The pair of guide tie rods (16) includes an upper tie rod (16A) on one side of the press (10), a lower tie rod (16B) on the other side of the press opposite thereto, and the base frame (11). A horizontal press according to claim 1 or 2, comprising a guide (18) for the movable intermediate plate (15).   At least one guide tie rod (16A) is retractable, is operably connected to each linear actuator (19), and is a linear actuator (25) of the movable plate (15) that supports the second mold member (14). The horizontal press according to claim 3, which can be driven selectively and continuously.   A pair of lower fixed tie rods (16B) and each linear actuator (19) that can be driven selectively in succession to the linear actuator (25) of the movable plate (15) that supports the second mold member (14). A horizontal press according to claim 1 or 2, comprising a pair of upper retractable tie rods (16A) operably connected to the upper part.   The horizontal press according to claim 4 or 5, wherein the fixed support plate (12) for the first mold member (13) includes a lock member (21) for the retractable tie rod (16A).   The horizontal press according to claim 1 or 2, wherein the linear actuator (25) for the movable plate (15) comprises a hydraulic actuator.   The linear actuator (25) for the movable plate (15) includes a roller or a ball circulation thrust screw driven by a direct-acting electric motor or a braking reduction gear motor. Horizontal press.   A horizontal press according to any of the preceding claims, wherein the two mold members (13, 14) comprise a mold recess (30) configured to produce a drive wheel for a vehicle.   A set of horizontal presses (10) according to any of the preceding claims, combined with a high-pressure mixing device (28) for supplying a reactive mixture to the recess (30) of the mold (13, 14).   11. A horizontal press (10) according to claim 10 and a set of mixing devices (28) for feeding the reactive mixture, the size being accommodated in a container.

Images