JP2007160894A - Molding equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable molding equipment of many sizes to combine a portion of an insert and a partition mold section while molding a lower half body of a pallet having a beam joint section by the simple molding equipment. <P>SOLUTION: The molding equipment 1 is for molding a lower half body I in a welding type pallet J. The molding equipment 1 comprises a fixed mold 2 and a movable mold 3. At least a portion of one mold of either the fixed mold 2 or the movable mold 3 comprises attaching an insert 5 for molding a rib side beam joint section having a plurality of rib recesses 4 for molding the undersurface side protruding a plurality of ribs F of a beam joining section G. Another mold of either the fixed mold 2 or the movable mold 3 comprises carrying out the side-by-side arrangement of a partition mold section 6 partitioned into a multiple number. Also the member corresponding to the insert 5 for molding the rib side beam joint section comprises arranging the plurality of partition mold sections 6. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mold apparatus for forming a lower half of a pallet.

  2. Description of the Related Art Conventionally, a welding-type pallet configured by welding and integrating a synthetic resin upper half and a synthetic resin lower half is known.

  As this welding type pallet, two types of welding type pallets are known. One type (both sides use) of the welding type pallet has an upper half with a plurality of upper girders vertically suspended on the lower surface of the upper deck with a solid upper surface, and a solid surface on the lower surface. The lower half of the upper deck is integrally welded with the lower half of the upper half and the lower half of the lower half of the lower half. It is constituted by doing.

  Another type (single-sided) welding type pallet has an upper half with the upper part of the upper girder integrally suspended from the lower part of the deck part, and the upper part of the lower part of the lower girder part is planar. A lower half provided with an opening that opens up and down at a portion surrounded by the girder connecting portion and the lower girder portion, and is integrally connected by a girder connecting portion projecting from the planar portion and having a plurality of ribs protruding downward from the planar portion The body is configured by welding and integrating the lower end portion of the upper girder portion of the upper half body and the upper end portion of the lower girder portion of the lower half body.

  The above-mentioned welding type pallet with a deck part on the top and bottom can be used even if it is turned upside down, but because the deck part has a solid top and bottom surface, a large amount of resin is required and the cost increases. There is a problem that the weight is also increased.

  In addition, the welding type pallet in which only the upper surface is a deck portion has an opening portion surrounded by a lower girder portion of the lower half and a girder connecting portion that integrally connects the lower girder portions. Thus, the amount of resin is small, the cost is low, and the weight can be reduced.

  For example, Patent Document 1 is known as a mold apparatus for molding the upper half and the lower half of a welding type pallet having deck portions on the upper and lower surfaces. This Patent Document 1 discloses a plurality of girder forming molds for forming each girder as a mold for forming an upper half or a lower half with a plurality of girder protruding from one side of a deck surface. Dividing the mold part and the deck surface forming mold part for forming the deck surface part excluding the girder part, and further dividing each girder forming mold part into a plurality of girder forming divided molds Spacer mold part for girder part is arranged between split molds for girder part so that configuration of girder part mold part of different size can be selected, and multiple deck surface part mold parts are common Consists of a spacer mold that is selectively placed between the mold and the common mold, thereby forming the upper and lower halves of different sizes, and welding and integrating the molded upper and lower halves By doing so, a welding type pallet can be formed.

  Thus, conventionally, a mold apparatus for forming an upper half body and a lower half body in which a plurality of girders protrude from one side of a deck portion into various sizes has been proposed.

  However, the lower portions of the plurality of lower girder portions are integrally connected by a girder connecting portion in which the upper surface is a planar portion and a plurality of ribs project downward from the planar portion, and is surrounded by the girder connecting portion and the lower girder portion. In order to mold the lower half with an opening that opens up and down in the part, conventionally, a dedicated fixed mold and a movable mold are prepared for each size of the lower half. A lower half of a predetermined size was formed using a mold and a movable mold.

  FIG. 19 shows an example of a mold apparatus including the fixed mold 2 and the movable mold 3. In FIG. 19, reference numeral 30 denotes a rib side girder connecting portion molding for forming the lower surface portion side of the girder connecting portion G in which the upper surface provided on the fixed mold 2 is a planar portion E and a plurality of ribs F project from the lower surface. 31 is a planar part side girder connecting part molding part for molding the upper surface part side which became the planar part E of the girder connecting part G provided in the movable mold 3, and is a rib side girder connecting part The forming part 30 becomes a convex having a plurality of rib forming concave parts 4 on the upper surface part, the planar part side girder connecting part forming part 31 becomes concave, and a concave part 33 is formed between the convex rib side girder connecting part forming parts 30. In addition, an opening forming convex portion 34 is formed on the planar portion side beam connecting portion forming portion 31. Then, as shown in FIG. 19A, the movable mold 3 is moved to the fixed mold 2 side, and the opening forming convex portion 34 is fitted into the concave portion 33. In the state of FIG. The synthetic resin 8 is injected between the movable mold 3 and the movable mold 3, and then the movable mold 3 is moved from the state of FIG. 19B to the fixed mold 2 side and pressed as shown in FIG. 19C. By doing so, the lower half I is formed. In this case, it slides in a state in which the opening forming convex portion 34 is fitted in the concave portion 33 to the state of FIG. 19C, and the opening forming convex portion 34 is combined with the portion in which the concave portion 33 is fitted. An opening H that is not filled with the resin 8 is formed.

  In this way, the lower portions of the plurality of lower girder portions D are connected together by a girder coupling portion G in which the upper surface is a planar portion E and a plurality of ribs F project downward from the planar portion E, and the girder coupling portion. In order to mold the lower half I having an opening H that opens up and down in the part surrounded by G and the lower girder part D, conventionally, a fixed die 2 for each size of the lower half I is conventionally used. Since the movable mold 3 was required, there was a problem that the mold cost was increased.

Further, in the conventional example as shown in FIG. 19, the opening forming convex portion 34 provided in the movable mold 3 is fitted into the concave portion 33 provided in the fixed mold 2 at the location where the opening H is formed. Due to the sliding structure, the opening forming convex part 34 provided in the movable mold 3 can be smoothly inserted into the concave part 33 provided in the fixed mold 2, and in addition, it is resisted by the movement of the movable mold 3 in the inserted state. In order to slide smoothly, the smooth insertion and sliding are allowed between the side surface of the opening forming convex portion 34 provided in the movable mold 3 and the inner side surface of the concave portion 33 provided in the fixed mold 2. Therefore, when the movable mold 3 is moved and pressed, the side surface of the opening forming convex portion 34 provided on the movable mold 3 and the fixed mold 2 are required. Synthetic resin 8 enters the gap between the inner surface of the provided recess 33 There is a problem that becomes seen Bali, there is a problem that the deburring work after molding is troublesome.
JP-A-6-79757

  The present invention has been invented in view of the above-described conventional problems. The upper surface side is a planar portion because the fork passes through, and the lower surface portion requires strength. The lower half of the pallet having the girder connecting part, which has a complicated shape, can be formed with a simple mold apparatus, and the mold apparatus can be easily manufactured. In forming the half body, it is possible to use part of the insert and split mold part together, which is advantageous for the molding of the lower half of the multi-size, and around the opening. It is an object of the present invention to provide a mold apparatus capable of preventing generation of burrs.

  In order to solve the above problems, a mold apparatus according to the present invention includes an upper half C in which a plurality of upper girder portions B are integrally suspended on a lower surface portion of a deck portion A, and lower portions of a plurality of lower girder portions D. Are connected together by a girder connecting part G having an upper surface as a planar part E and a plurality of ribs F projecting downward from the planar part E, and surrounded by the girder connecting part G and the lower girder part D. The lower half I provided with the opening H that opens up and down is welded and integrated with the lower end of the upper girder B of the upper half C and the upper end of the lower girder D of the lower half I. A mold apparatus 1 for forming a lower half I of a pallet J to be configured, wherein the mold apparatus 1 includes a fixed mold 2 and a movable mold 3, and the fixed mold 2 or the movable mold A rib side having a plurality of rib forming recesses 4 for forming at least a part of one mold of the mold 3 on the lower surface side where the plurality of ribs F of the girder connecting portion G project. It is configured by attaching the insert 5 for forming the connecting portion, and is configured by juxtaposing the divided mold portion 6 obtained by dividing the other mold of the fixed mold 2 or the movable mold 3 into a plurality, Also in the portion corresponding to the rib side beam connecting portion molding insert 5, a plurality of divided mold portions 6 are arranged side by side.

  Of the fixed mold 2 and the movable mold 3 for molding the lower half I, the mold for molding the lower surface side of the lower half I of the fixed mold 2 and the mold 3 for molding the lower surface portion of the girder connecting portion G are the strongest. This part is a part where a plurality of ribs are formed and the shape is complicated. In addition, this part is provided in many places (in the case of the lower half I of the four-way pallet J in the pallet J). 12 places). For this reason, if the part that forms the lower surface part of the girder connecting part G is processed integrally with the mold part, it is necessary to perform complicated processing on each of the many parts of the mold part, and the processing takes cost and time. On the other hand, in the present invention, a portion for molding the lower surface portion of the girder connecting portion G is formed separately from the mold as the rib side girder connecting portion forming insert 5, thereby reducing the processing cost and processing time. Can be shortened. In addition, by replacing the insert 5 for forming the rib side girder connecting part with the same dimensions and changing the number of ribs, thickness, etc., the lightweight type (the number of ribs is small) or the high strength type (the number of ribs is small) Many) pallets J can be formed. Moreover, since the rib side girder connecting portion molding insert 5 is separate from the mold, a plurality of types of rib side girder connecting portion forming inserts 5 are prepared so that the lower half I of different sizes can be obtained. Can be incorporated as a nesting when forming a mold for molding, and some nesting can also be used as a nesting when configuring a mold for molding the lower half I of a different size It becomes possible. Although the lower half I is placed directly on the ground, the number of nesting points is small, and problems (steps) due to accuracy hardly occur, and rattling of the pallet J is prevented. In addition, the step is caused by dragging the pallet J on the concrete, leading to generation of scraped dust, but this is also suppressed. Further, in the mold for molding the upper surface side of the lower half I of the fixed mold 2 and the movable mold 3 for molding the lower half I, the rib F is formed as described above. Since a complicated shape is not required, a mold can be configured by arranging a plurality of divided mold parts 6 that can be processed relatively easily, whereby a mold for molding the upper surface side of the lower half I having different sizes. Can be configured easily. In addition, even when the rib-side girder connecting portion molding insert 5 is different in size, since the plurality of divided mold portions 6 are arranged side by side in the portion corresponding to the rib-side girder connecting portion forming insert 5, Accordingly, it is possible to easily cope with this by selecting a combination of a plurality of divided mold parts 6.

  Further, the upper half C in which a plurality of upper girder portions B are integrally suspended on the lower surface portion of the deck portion A, and the lower portions of the plurality of lower girder portions D are formed into a planar portion E, and the planar portion E A lower half body I which is integrally connected by a girder connecting portion G having a plurality of ribs projecting downward from it and provided with an opening H which opens up and down in a portion surrounded by the girder connecting portion G and the lower girder portion D; Is a metal for forming the lower half I in the pallet formed by welding and integrating the lower end of the upper girder part B of the upper half C and the upper end of the lower girder part D of the lower half I. The mold apparatus 1 includes a fixed mold 2 and a movable mold 3, and at least a part of either the fixed mold 2 or the movable mold 3 is connected with a girder. A rib side beam connecting portion forming insert 5 having a plurality of rib forming recesses 4 for forming the lower surface side of the portion G is attached and an opening for forming a lower portion of the opening H is provided. A split mold in which either the fixed mold 2 or the movable mold 3 is divided into a plurality of molds by mounting the lower part forming insert 7 in a state of being elastically urged upward. A plurality of divided mold parts 6 are arranged side by side in the portion corresponding to the rib side girder connecting portion forming insert 5 and correspond to the opening lower forming insert 7. The upper part of the opening H may be formed by pressing the opening lower molding insert 7 while the split mold portion 6 to be in surface contact with the upper surface of the opening lower molding insert 7. .

  With this configuration, in the mold for molding the lower surface side of the lower half I of the fixed mold 2 and the movable mold 3 for molding the lower half I, the girder connecting portion G The part that molds the lower surface part is a part that forms a plurality of ribs because the strength is required most, and the shape is complicated, and this part has many parts (four-way pallet) in the mold part. 12 in the case of J's lower half I). For this reason, if the portion for molding the lower surface portion of the girder connecting portion G is processed integrally with the mold portion, the processing of the mold takes cost and time. On the other hand, in the present invention, this girder connecting portion G By forming a portion for molding the lower surface portion of the metal plate separately from the mold as the rib side beam connecting portion forming insert 5, it is possible to reduce the processing cost and the processing time. Moreover, since the rib side girder connecting portion molding insert 5 is separate from the mold, a plurality of types of rib side girder connecting portion forming inserts 5 are prepared so that the lower half I of different sizes can be obtained. Can be incorporated as a nesting when forming a mold for molding, and some nesting can also be used as a nesting when configuring a mold for molding the lower half I of a different size It becomes possible. The split mold portion 6 corresponding to the opening lower molding insert 7 comes into surface contact with the upper surface of the opening lower molding insert 7 and presses the opening lower molding insert 7 to open the opening. Since it forms the upper part of H, it can shape | mold so that a burr | flash may not generate | occur | produce around the opening part H. Further, in the mold for molding the upper surface side of the lower half I of the fixed mold 2 and the movable mold 3 for molding the lower half I, the rib F is formed as described above. Since a complicated shape is not required, a mold can be configured by arranging a plurality of divided mold parts 6 that can be processed relatively easily, whereby a mold for molding the upper surface side of the lower half I having different sizes. Can be configured easily. In addition, even when the rib-side girder connecting portion molding insert 5 is different in size, since the plurality of divided mold portions 6 are arranged side by side in the portion corresponding to the rib-side girder connecting portion forming insert 5, Accordingly, it is possible to easily cope with this by selecting a combination of a plurality of divided mold parts 6.

  Further, the end portion of the split mold portion 6 for forming the upper portion of the opening H is opened by pressing the opening lower forming insert 7 in surface contact with the upper surface of the opening lower forming insert 7. It projects sideward from the side surface of the lower portion forming insert 7 to become a side protruding portion 9, and the side end surface of the side protruding portion 9 forms the upper side surface of the girder connecting portion G. It is preferable that at least the surface of the projecting portion 9 that faces the cavity 10 of the projecting base is a surface 12 that is flush with the flat surface 11 that is in surface contact with the upper surface of the opening lower molding insert 7.

  By adopting such a configuration, a gap is not generated between the upper surface of the opening lower molding insert 7 and the split mold portion 6 facing the press molding pressure, and no burrs can be generated. .

  Further, the end portion of the split mold portion 6 for forming the upper portion of the opening H is opened by pressing the opening lower forming insert 7 in surface contact with the upper surface of the opening lower forming insert 7. It projects sideward from the side surface of the lower portion forming insert 7 to become a side protruding portion 9, and the side end surface of the side protruding portion 9 forms the upper side surface of the girder connecting portion G. It is preferable that the surface of the protruding portion 9 facing the cavity 10 is an inclined surface portion 13 for forming so that the upper corner portion of the beam connecting portion G to be formed becomes an inclined corner portion.

  By adopting such a configuration, when the upper corner portion of the girder connecting portion G is formed so as to be inclined, a portion projecting at an acute angle (portion that becomes a pin angle) does not occur in the divided mold portion 6. The divided mold part 6 is not easily damaged.

  The present invention provides a lower half of a pallet having a girder connecting portion in which the upper surface becomes a planar portion because the fork passes and the lower surface portion requires strength and a plurality of ribs protrude and the shape of the lower surface side becomes complicated. A mold apparatus for molding a body can be easily configured at low cost. In addition, it is possible to use some nesting and split molds when forming the lower half of pallets of different sizes, which is advantageous for multi-size molding and has an opening. It is possible to provide a mold apparatus that can prevent burrs from occurring around the portion.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  FIG. 12 shows a welding type pallet J made of synthetic resin. The welding type pallet J of FIG. 12 is made of a synthetic resin in which a plurality of upper girder parts B are vertically suspended from the lower surface part of the deck part A. The upper half C and the lower portions of the plurality of lower girder portions D are connected together by a girder connecting portion G in which the upper surface is a planar portion E and a plurality of ribs F project downward from the planar portion E. The lower half I made of synthetic resin provided with an opening H that opens up and down in the part surrounded by the girder connecting part G and the lower girder part D is a lower end part of the upper girder part B of the upper half C. The upper half part D of the lower half I is constructed by welding and integrating the upper part of the lower girder I, and the upper part B and the lower part D are integrated by welding. It is a fork insertion part K.

  The mold apparatus 1 of the present invention is for molding the lower half I in the welding type pallet J described above. An embodiment of the lower half I is shown in FIGS. The lower half I shown in FIGS. 9 to 11 is a lower half I for forming a pallet J having a size of 1200 mm × 1100 mm. Therefore, the lower half I of FIG. 11 has a size of 1200 mm × 1100 mm. An example is shown.

  A mold apparatus 1 for molding the lower half I described above is composed of a fixed mold 2 and a movable mold 3.

  One of the fixed mold 2 and the movable mold 3 is a mold for molding the lower surface side of the lower half I, and the other is a mold for molding the upper surface side of the lower half I, and is movable. A cavity 10 is formed on the opposing surface of the mold 3 and the fixed mold 2. Here, it is possible to press mold the synthetic resin 8 by moving the movable mold 3 after injecting the synthetic resin 8 into the cavity, or the cavity after the movable mold 3 and the fixed mold 2 are clamped. 10 may be formed by injection molding the synthetic resin 8. Alternatively, the lower surface side of the lower half I may be formed with the fixed mold 2, and the upper surface side may be formed with the movable mold 3, and the upper surface side of the lower half I may be formed with the fixed mold 2, The lower surface side may be formed by the movable mold 3.

  In the embodiment shown in the accompanying drawings, an example of press molding will be described. Further, an example will be described in which the lower surface side of the lower half I is molded with the fixed mold 2 and the upper surface side is molded with the movable mold 3. For convenience of explanation, in the following explanation, the fixed mold 2 side is defined as the bottom, the movable mold 3 side is defined as the top, and the moving direction of the movable mold 3 is defined as the vertical direction. It is not limited to the one arranged so that the fixed mold 2 side is down and the movable mold 3 side is up, or the fixed mold 2 side is arranged up and the movable mold 3 side is arranged down, or The fixed mold 2 and the movable mold 3 may be arranged on the left and right, and the movable mold 3 may be moved in the left-right direction.

  3 and 4 show an example of the fixed mold 2, and at least a part of the upper surface of the fixed mold 2 serving as the inner surface of the cavity 10 is the lower surface of the girder connecting portion G of the lower half I. The rib side girder connecting portion forming insert 5 for forming the side and the opening lower forming insert 7 for forming the lower portion of the opening H are attached to the upper surface of the fixed mold 2. It is.

  That is, a portion for molding the lower surface side of the girder connecting portion G on the upper surface of the fixed mold 2 (in the embodiment of FIG. 11, the lower half I of the four-way pallet J is formed, so that the girder connecting portion G is Twelve places are provided with insert mounting recesses 14, and the rib side girder connecting portion forming inserts 5 are detachably fitted in the insert mounting recesses 14 and are attached by bolts. A plurality of rib forming recesses 4 are formed on the upper surface of the rib side beam connecting part forming insert 5 for forming the lower surface side of the beam connecting part G projecting a plurality of ribs F for forming. is there.

  Here, the lower half body I has a nested structure in which the rib-side girder connecting portion forming insert 5 is attached to a location where the lower surface side of the girder connecting portion G on the upper surface of the fixed mold 2 is formed. On the lower surface side, the lower surface side of the girder connecting portion G has a most complicated shape because a plurality of reinforcing ribs F project, and the machining of the mold is the most complicated. Since it is necessary to process and form a plurality of locations on the top surface of one fixed mold 2 (12 locations in the case of 4-way insertion), rather than processing to a plurality of locations on one fixed mold 2 By dividing the fixed die 2 into the main body 2a that does not require complicated processing and the rib side beam connecting portion forming insert 5 that requires complicated processing, the processing is easy and low cost. Nest for forming rib side girder joints with the same dimensions, but with the number of ribs and thickness changed. By exchanging it can be molded pallet J of lightweight (less number of ribs) and high-strength type (number of ribs is large). Moreover, when forming the lower half I of the pallet J having different sizes by preparing a plurality of sizes of the rib side beam connecting portion forming inserts 5 that require complicated processing, rib side beams of any size can be formed. The connecting part forming insert 5 can be selected and used, and a part of the rib side girder connecting part forming insert 5 is also used for forming the lower half I of the pallet J of a plurality of sizes. Can be used. Although the lower half I is placed directly on the ground, the number of nesting points is small, and problems (steps) due to accuracy hardly occur, and rattling of the pallet J is prevented. In addition, the step is caused by dragging the pallet J on the concrete, leading to generation of scraped dust, but this is also suppressed. The rib side girder connecting portion molding insert 5 may be provided with a protruding portion for forming a water drain hole.

  Further, a portion where the lower part of the opening H on the upper surface of the fixed mold 2 is formed (in the embodiment shown in FIGS. 3 and 4, the lower half I of the four-way pallet J is formed, so the opening H is (4 places) are provided with recesses 15 for insertion fitting, and the lower portions of the opening lower molding insert 7 for forming the lower portion of the opening H can be moved up and down in each recess 15 for insertion insertion. A spring material 16 is interposed between the bottom of the recess 15 for inserting the insert and the lower surface of the opening lower forming insert 7, and the opening lower forming insert 7. The upper portion of the opening lower molding insert 7 protrudes upward from the upper end of the insertion fitting recess 15, and the side lower portion of the girder connecting portion G is the opening lower molding insert. It is formed by a side end face protruding upward from the upper end of the insert fitting recess 15 of the child 7. The biasing means may be a hydraulic cylinder or an air cylinder other than the spring.

  Here, a nested structure in which a recessed portion 15 for insertion fitting is provided at a position forming the lower portion of the opening H on the upper surface of the fixed mold 2 and the lower portion of the opening lower molding insert 7 is fitted so as to be movable up and down. The reason is that when the fixed mold 2 is formed, the opening lower molding insert 7 is slidably incorporated into the insert fitting recess 15 so that the side surface of the insert fitting recess 15 and the opening lower molding insert It can be assembled with high precision so that there is no gap between the side surface of the child 7 and can be accurately moved up and down, and the synthetic resin is provided between the side surface of the recessed portion 15 for inserting the insert and the side surface of the opening lower forming insert 7. This is because it is possible to prevent the phenomenon that burrs are generated when 8 enters.

  5 to 7 show an embodiment of the movable mold 3 corresponding to the fixed mold 2 shown in FIGS. The movable mold 3 is configured by arranging divided mold parts 6 divided into a plurality of blocks and arranged in parallel. Here, a plurality of divided mold portions 6 are also arranged in a portion corresponding to the rib side beam connecting portion forming insert 5 (portion for forming the planar portion E on the upper surface of the beam connecting portion G). In addition, you may provide the protrusion type | mold part for forming a drain hole in the division mold part 6 provided in the part which forms the planar part E of the upper surface of this girder connection part G. FIG.

  As described above, the divided mold portion 6 obtained by dividing the movable mold 3 into a plurality is arranged in parallel to configure the movable mold 3 that forms the upper surface side of the lower half I of the pallet J having different sizes. In this case, a combination of a plurality of divided mold parts 6 is selected, or a part of the plurality of divided mold parts 6 is also used as a divided mold part 6 for constituting the movable mold 3 of various sizes. This is so that it can easily cope with multi-size ones, and a plurality of divided mold parts 6 are also arranged in parallel at the part corresponding to the rib side beam connecting part forming insert 5. Thus, even at locations corresponding to the plurality of rib-side beam connecting portion molding inserts 5, a combination of the plurality of divided mold portions 6 can be selected, or a part of the plurality of divided mold portions 6 can be selected in various sizes. Can be used as a split mold part 6 for constituting the movable mold 3 This is to kill so.

  Further, the split mold part 6 (hereinafter referred to as the open part upper molding split mold part 6A) facing the lower opening molding insert 7 moves the movable mold 3 to the fixed mold 2 side. The lower surface is brought into surface contact with the upper surface of the opening lower molding insert 7 and the opening lower molding insert 7 is pushed into the insertion fitting recess 15 against the spring material 16 in the surface contact state. The upper part of the part H is formed.

  In the embodiment shown in FIGS. 13 (a) and 13 (b), the lower part of the opening upper molding split mold 6A is larger than the upper surface of the opening lower molding insert 7, and the upper part of the opening upper molding split. With the lower surface of the mold portion 6A in surface contact with the upper surface of the opening lower molding insert 7, the side end portion of the opening upper molding split mold portion 6A is from the side surface of the opening lower molding insert 7. Also, the side end surface of the side protruding portion 9 which is a portion protruding to the side of the opening lower molding insert 7 forms the upper portion of the side surface of the girder connecting portion G. It is like that. The lower part of the side surface of the girder connecting part G is formed by the side end face of the opening lower molding insert 7.

  Here, in the embodiment shown in FIG. 13A, the flat surface 11 in which at least the surface of the side protrusion 9 facing the cavity 10 of the protruding base is in surface contact with the upper surface of the opening lower molding insert 7. The surface 12 is continuous with the surface.

  That is, if the protruding base portion of the side protruding portion 9 is not the flat surface 11, as shown in the reference example of FIG. 13C, the upper end portion of the opening lower molding insert 7 and the upper opening portion are formed. A gap is formed between the lower end portion of the divided mold part 6A, or a gap is formed as shown in the reference example of FIG. 13C due to thermal expansion during pressing, as described above. At the time of pressing, the surface of the side protrusion 9 facing the cavity 10 of the protruding base is a surface 12 that is flush with the flat surface 11 that comes into surface contact with the upper surface of the opening lower molding insert 7. Even if this thermal expansion occurs, it is possible to avoid the formation of a gap as shown in FIG.

  In addition, as shown in FIG. 8 described later, when the movable mold 3 moves to the fixed mold 2 side and press-molds while pressing the synthetic resin 8, the division corresponding to the rib-side beam connecting portion molding insert 5 is performed. The synthetic resin 8 pressed by the lower surface of the mold part 6 is formed along the lower surface of the divided mold part 6 corresponding to the rib side girder connecting part molding insert 5 and the upper surface and the opening part of the opening lower molding insert 7 The flow of the synthetic resin 8 by the press is changed substantially downward by providing the side protrusion 9 so as to flow into the portion where the lower surface of the upper mold part 6A is in surface contact. This part can be prevented from flowing into a portion where the lower surface of the split upper mold part 6A for opening is in surface contact with the upper surface of the lower mold insert 7 by pressing pressure. Can prevent burrs from occurring. In this case, at least part of the lower surface of the split mold part 6 adjacent to the opening upper part split mold part 6A among the plurality of split mold parts 6 corresponding to the rib side girder connecting part molding insert 5 or When the inclined surface 18 is formed so that the entire portion is on the lower side of the opening upper molding split mold portion 6A side, the flow of the synthetic resin 8 due to the press pressure flows along the inclined surface 18 in the opening upper molding split mold. The lower surface of the portion 6A tries to flow into a place where the lower surface of the opening lower molding insert 7 is in surface contact, but by providing the side protrusion 9 as described above, the synthetic resin 8 by pressing is provided. The flow direction can be changed substantially downward so that it does not flow into the surface contact area. Even if the flow of the synthetic resin is upward, there is no gap due to the fixed divided upper mold part 6A, so the synthetic resin does not flow and become burrs.

  Moreover, in embodiment shown to Fig.13 (a), FIG.13 (b), the surface which opposes the cavity 10 of the side protrusion part 9 is the corner part which the upper corner part of the girder connection part G shape | molded inclined. It becomes the inclined surface part 13 for shape | molding so that it may become. The inclined surface portion 13 includes not only an inclined surface portion having an arc shape as shown in FIGS. 13A and 13B but also an inclined surface portion having a straight section.

  In forming the upper corner portion of the girder connecting portion G so as to be an inclined corner portion, as shown in the reference diagram of FIG. When an inclined surface portion 13 ′ for inclining the upper corner portion of the girder connecting portion G is formed in the divided mold portion 6, the end portion including the inclined surface portion 13 ′ is an opening upper-forming divided mold portion 6 </ b> A. It protrudes further downward to become an acute angle protrusion 19 (portion having a pin angle), and the movable mold 3 is moved so that the side surface of the acute angle protrusion 19 of the split mold part 6 is formed on the opening lower molding insert 7. Since the structure is fitted to the side surface, the acute protrusion 19 having the pin angle is easily damaged during the insertion, but the surface of the side protrusion 9 facing the cavity 10 is molded as described above. In order to mold the upper corner portion of the girder connecting portion G to be an inclined corner portion By forming the inclined surface portion 13, it protrudes at an acute angle to the split molds 6 moiety (portion a pin angle) does not occur, split mold member 6 is not easily damaged.

  Forming the lower half I of the welding type pallet J using the mold apparatus 1 of the present invention comprising the fixed mold 2 and the movable mold 3 is performed as follows.

  First, the movable mold 3 is moved to the fixed mold 2 side as shown by the arrow in FIG. 8A, and the cavity 10 is formed by the movable mold 3 and the fixed mold 2 as shown in FIG. 8B. To do. In the state shown in FIG. 8B, the lower surface of the upper mold forming mold part 6 </ b> A of the movable mold 3 is pressed in surface contact with the upper surface of the lower opening molding insert 7. In the state of FIG. 8B, the synthetic resin 8 is injected into the cavity 10. Next, the movable mold 3 is moved to the fixed mold 2 side, and the synthetic resin 8 is pressed to the press completion position in FIG. In this case, the opening lower molding insert 7 is pressed in a surface contact state by the opening upper molding split mold portion 6 </ b> A so as to resist the spring force of the spring material 16 and enter the insert fitting recess 15. Go backwards. 8C, the lower half I is formed. In this case, the lower part of the opening H is formed by the opening lower molding insert 7, and the opening upper molding split mold is formed. The upper part of the opening H is formed by the part 6A. That is, the lower part of the inner peripheral surface of the opening H (that is, the lower part of the side face on the opening H side of the girder connecting part G) is formed by the upper side surface of the opening lower molding insert 7, and the inner peripheral surface of the opening H The upper part (that is, the upper part of the side face on the opening H side of the girder connecting part G) is formed by the lower side face of the split mold part 6A for opening upper part forming.

  As described above, the opening lower molding insert 7 slides and retreats in the insert fitting recess 15 and press-molds, but as described above, the opening lower molding insert 7 is inserted. Since it can be incorporated with high precision and free movement so as not to create a gap between the side surface of the fitting recess 15 and the side surface of the opening lower molding insert 7, the side surface and opening of the insertion fitting recess 15 The phenomenon that the synthetic resin 8 enters between the side surfaces of the lower molding insert 7 to generate burrs does not occur. Further, the lower surface of the opening upper molding split mold portion 6A slides while pressing the upper surface of the opening lower molding insert 7 against the spring material 16 in a surface contact state to reach the press completion position shown in the figure. Therefore, during pressing, the lower surface of the opening upper molding split mold portion 6A is kept in close contact with the upper surface of the opening lower molding insert 7 without any gap, and is also synthesized at the contact portion between the two. The resin does not enter, and no burrs are generated in this portion.

  In forming the opening H, it may be possible to form only the side surface of the divided mold part 6 as shown in FIGS. 13E and 13F, but in the case of the reference example in FIG. Since the position of the insert 7 'movably provided in the fixed mold 2 is not stable, the insert 7' is damaged or burrs are generated, and in the case of the reference example of FIG. 13 (f), vertical burrs are generated. Therefore, it is not preferable.

  As described above, according to the present invention, no burrs are generated around the opening H of the molded lower half I, and no post-operation after removing the burrs around the opening H is required.

  Further, as already described, as shown in FIG. 13 (a), the side protruding portion 9 is provided at the side end of the opening upper part dividing mold portion 6A, and at least the protruding base portion of the side protruding portion 9 is provided. In the case where the surface facing the cavity 10 is a flat surface 11 that is in contact with the upper surface of the opening lower molding insert 7 and a surface 12 that is continuous with the flat surface 11, the opening lower molding insert is further pressed by the press pressure. A gap is not generated between the upper surface of 7 and the divided mold part 6 facing the upper surface, so that no burrs can be generated.

  FIG. 13 (g) shows another embodiment of the present invention, in which the upper surface end of the opening lower molding insert 7 and the lower surface end of the opening upper molding split mold portion 6A are both. This is an example in which the inclined surfaces are in plane contact with each other.

  By the way, there are various sizes as the pallet J, for example, 900 mm × 900 mm,... 950 mm × 1000 mm,... 1000 mm × 1100 mm,. There are different sizes. Therefore, the lower half I also corresponds to the size of the pallet J, 900 mm × 900 mm,... 950 mm × 1000 mm,... 1000 mm × 1100 mm,. There are many different sizes.

  In constructing the fixed mold 2 and the movable mold 3 of various sizes as described above, an example in which a part of the constituent members is used in different sizes is shown in FIGS. 3 to 7 and FIGS. 14 to 18. Based on

  3 and 4 show the fixed mold 2 for molding the lower half I of the size of 1200 mm × 1100 mm, and FIGS. 5 to 7 show the movable mold for molding the lower half I of the size of 1200 mm × 1100 mm. 3 is shown.

  14 and 15 show the fixed mold 2 for molding the lower half I of the size of 1200 mm × 900 mm, and FIGS. 16 to 18 show the movable half of the lower half I of the size of 1200 mm × 900 mm. A mold 3 is shown.

  Here, among the rib side girder connecting part molding inserts 5 attached to the fixed dies 2 of different sizes in FIGS. 3, 4, 14 and 15, the rib side girder connecting part drawn with a large number of dodds. The molding insert 5 is attached to both the fixed mold 2 for molding the lower half I of the size of 1200 mm × 1100 mm and the fixed mold 2 for molding the lower half I of the size of 1200 mm × 900 mm. Also used as a child. On the other hand, the rib side girder connecting portion molding insert 5 drawn in white in FIGS. 3, 4, 14, and 15 is not used in both the 1200 mm × 1100 mm size and the 1200 mm × 900 mm size.

  Further, in configuring the movable molds 3 having different sizes in FIGS. 5 to 7 and FIGS. 16 to 18, the divided mold parts drawn by applying a large number of dods out of the divided divided mold parts 6. 6 is a split mold part that is commonly attached to both the movable mold 3 for molding the movable mold 3 for molding the lower half I of the size of 1200 mm × 1100 mm, and the lower half I for the size of 1200 mm × 900 mm. 6, on the other hand, the divided mold parts 6 drawn in white in FIGS. 5 to 7 and FIGS. 16 to 18 are not used in the 1200 mm × 1100 mm size and the 1200 mm × 900 mm size.

  In the above example, the opening lower molding inserts 7 have different sizes. Of course, other than the above-mentioned size, the opening lower portion forming insert 7 can also be used.

  In this way, when the fixed mold 2 that forms the lower surface side of the lower half I of various sizes in advance is configured, a plurality of types of rib side girder connecting portion forming inserts 5 having different sizes, a plurality of sizes having different sizes are provided. A kind of opening lower forming insert 7 of various types is prepared, and an arbitrary rib side girder connecting insert forming insert 5 and opening lower forming insert 7 are selected from these, and a fixed mold formed for each size. 2, the fixed die 2 having a desired size can be formed by attaching it to the insert mounting recess 14 and the insert fitting recess 15 of the main body 2a. Since the part forming insert 5 and the opening lower part forming insert 7 can be used together, the fixed mold 2 of various sizes can be configured at low cost.

  In addition, by preparing a plurality of types of divided mold parts 6 that are blocked in different sizes, a plurality of divided mold parts 6 that are blocked out of these are selected and arranged in parallel, and movable in various sizes. The mold 3 can be configured, and in this case, a part of the divided mold parts 6 can be used together, so that the movable mold 3 of various types can be configured at low cost.

  In the above embodiment, an example in which the lower surface side of the lower half I is formed by the fixed mold 2 and the upper surface side of the lower half I is formed by the movable mold 3 has been described. The upper surface side of the lower half I may be molded by the movable mold 3 while the lower surface side of the lower half I is molded by the movable mold 3. In this case, the movable mold 3 is fixed to the fixed mold 2 in the above description. The mold 2 is replaced with the movable mold 3 respectively.

  In addition, as a mold apparatus which shape | molds the upper half C of the welding-type pallet J, it can shape | mold with the mold apparatus of conventionally well-known various structures.

  For welding the upper half C and the lower half I, various conventionally known devices can be used.

It is sectional drawing of the part corresponding to the XX line of FIG. 10 of the metal mold | die apparatus of one Embodiment of this invention. It is sectional drawing of the part corresponding to the YY line of FIG. 10 same as the above. It is a top view of the fixed metal mold | die of a metal mold apparatus same as the above. It is a decomposition | disassembly top view of a fixed metal mold | die same as the above. It is a top view of the movable metal mold | die of a metal mold apparatus same as the above. It is a decomposition | disassembly top view of the divided | segmented mold part made into blocks which comprises the movable metal mold | die same as the above. It is a bottom view of the movable mold same as the above. (A) (b) (c) is explanatory drawing which shows the shaping | molding order which shape | molds a lower half body with the metal mold apparatus same as the above. It is a top view of the lower half body shape | molded with the die apparatus same as the above. It is a bottom view of the lower half body shape | molded by the metal mold apparatus same as the above. (A) is a front view of the lower half body shape | molded with the mold apparatus same as the above, (b) is a side view, (c) is sectional drawing of the XX line of FIG. 10, (d) FIG. 11 is a cross-sectional view taken along line YY in FIG. 10. The welding type pallet formed using the lower half formed by the mold apparatus is shown, (a) is a plan view, (b) is a bottom view, (c) is a front view, (D) is a side view. (A) (b) (g) is sectional drawing which shows each embodiment of the opening lower part nest for forming the opening part same as the above, and a division mold part, respectively (c) (d) ( e) (f) is a sectional view showing a reference example. It is a top view of the fixed metal mold | die of the die apparatus of a different size of this invention. It is a decomposition | disassembly top view of a fixed metal mold | die same as the above. It is a top view of the movable metal mold | die of a metal mold apparatus same as the above. It is a decomposition | disassembly top view of the divided | segmented mold part made into blocks which comprises the movable metal mold | die same as the above. It is a bottom view of the same mold apparatus. (A) (b) (c) is explanatory drawing which shows the shaping | molding order which shape | molds a lower half body with the conventional metal mold apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold apparatus 2 Fixed mold 3 Movable mold 4 Rib molding recessed part 5 Rib side girder connecting part molding insert 6 Divided mold part 7 Opening lower part forming insert 9 Side protrusion 10 Cavity 11 Flat surface 12 side 13 inclined surface A deck part B upper girder part C upper half D lower girder part E surface part F rib G girder connecting part H opening I lower half part J pallet

Claims (4)

The upper half of which the upper girder is integrally suspended from the lower surface of the deck part, and the lower parts of the lower girder are formed into a planar part on the upper surface, and a plurality of ribs project downward from the planar part. The lower half body which is integrally connected with the installed girder connecting portion and has an opening which opens up and down in a portion surrounded by the girder connecting portion and the lower girder portion is a lower end portion of the upper girder portion of the upper half body. A mold apparatus for molding the lower half of the pallet configured by welding and integrating the upper end of the lower girder of the lower half,
The mold apparatus is composed of a fixed mold and a movable mold, and at least a part of either the fixed mold or the movable mold is provided on the lower surface side where a plurality of ribs of the girder connecting portion project. A split die that is formed by attaching a rib side girder connecting portion forming insert having a plurality of rib forming recesses for forming a mold, and dividing either the fixed die or the movable die into a plurality of pieces. A mold apparatus comprising a plurality of divided mold parts arranged side by side in a portion corresponding to the rib side girder connecting part molding insert. The upper half of which the upper girder is integrally suspended from the lower surface of the deck part, and the lower parts of the lower girder are formed into a planar part on the upper surface, and a plurality of ribs project downward from the planar part. The lower half body which is integrally connected with the installed girder connecting portion and has an opening which opens up and down in a portion surrounded by the girder connecting portion and the lower girder portion is a lower end portion of the upper girder portion of the upper half body. A mold apparatus for molding the lower half of the pallet configured by welding and integrating the upper end of the lower girder of the lower half,
The mold apparatus is composed of a fixed mold and a movable mold, and at least a part of either the fixed mold or the movable mold is provided on the lower surface side where a plurality of ribs of the girder connecting portion project. A rib side girder connecting portion forming insert having a plurality of rib forming recesses for forming the opening and a state where the opening lower forming insert for forming the lower portion of the opening is elastically biased upward The rib side girder connecting part is formed by arranging in parallel a split mold part in which either the fixed mold or the movable mold is divided into a plurality of molds. In the portion corresponding to the insert, a plurality of split mold portions are arranged side by side, and the split mold portion corresponding to the opening lower molding insert is in surface contact with the upper surface of the opening lower molding insert. The upper part of the opening is formed by pressing the insert for forming the lower part of the opening. Mold apparatus according to claim.   The end of the split mold part for molding the upper part of the opening by pressing the opening lower molding insert in surface contact with the upper surface of the opening lower molding insert is the opening lower molding insert It protrudes to the side from the side surface of the side to become a side protrusion, and the side end surface of the side protrusion forms the upper part of the side surface of the girder connecting portion, and faces at least the cavity of the protrusion base of the side protrusion. 3. The mold apparatus according to claim 2, wherein the surface to be formed is a surface that is flush with a flat surface that is in surface contact with the upper surface of the opening lower mold insert. The end of the split mold part for molding the upper part of the opening by pressing the opening lower molding insert in surface contact with the upper surface of the opening lower molding insert is the opening lower molding insert The side protrusions of the side projections form the side upper portions of the spar connecting portions, and the side facing the cavity of the side projections, 4. The mold apparatus according to claim 2, wherein the upper corner portion of the beam connecting portion to be formed is an inclined surface for forming an inclined corner portion.

Images