JP2009056716A - Rotary vertical injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary vertical injection molding machine which can pick up a finished product and also can maintain the temperature of a waiting bottom mold on even in the case wherein the finished products are picked up after the turntable is intermittently turned around by 90°. <P>SOLUTION: A movable plate is installed over the turntable placed on the fixed plate in a manner wherein the plate freely goes up and down. Four bottom molds are installed each on the quarters of the turntable at evenly spaced intervals. The stop positions of the bottom molds are served for the primary molding operation position, the standby position, the secondary operation position and the picking-up positions in this order. Upper molds fitting with the bottom molds at both of the molding operation positions and heat-retaining molds fitting with the bottom molds at the standby position are arranged on the movable plate. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotary vertical injection molding machine in which a turntable provided with a plurality of lower molds at equal intervals on a table is intermittently rotated to perform primary molding and secondary molding simultaneously.

  As a rotary injection molding machine, a pair of fixed molds are installed on the fixed plate at equal intervals in the circumferential direction, and the fixed molds and movable molds that respectively close the molds are provided below the movable plate. Installed on the side turntable downward, and the injection device is installed on both fixed molds from the side so that primary molding and secondary molding can be performed continuously by intermittent movement of the turntable and recombination of the mold. What is made is known.

In addition, as a compound injection molding machine, a movable plate with a rotating plate provided on the surface of the plate is arranged between a pair of fixed plates connected by a tie bar, and a primary cavity mold and a secondary cavity mold are placed at opposite positions of one fixed plate. Installed as a fixed mold, multiple core molds that close the fixed mold and molds are installed as movable molds on the rotating disk, injection devices arranged on both fixed molds, and recombination of molds by intermittent movement of the rotating disk Thus, it is known that primary molding and secondary molding can be performed continuously.
Japanese Utility Model Publication No. 7-15318 JP 2003-191281 A

  In the conventional rotary injection molding machine and composite injection molding machine described above, a pair of lower molds are rotated 180 ° by a rotating disk so that primary molding and secondary molding can be performed simultaneously. When the finished product is taken out by an automatic machine, the paired lower molds are stopped every 90 ° by the turntable, and the finished product is taken out between the primary molding operation unit and the secondary molding operation unit that are opposed to each other. There is a case to do.

  When a take-out operation unit for a finished product is set between the primary molding operation unit and the secondary molding operation unit, the pair of lower dies are rotated by 90 ° from the molding operation unit and stopped at the take-out operation unit and its opposing position. For this reason, both the molding time and the removal time are required as the molding cycle time. Further, the position opposite to the take-out operation portion is a standby position of the lower mold after the primary molding, and the lower mold is left together with the primary molded product until the finished product is taken out. For this reason, the lower mold is cooled, and the primary molded product contracts, which also has the problem of affecting the next secondary molding.

  The present invention has been conceived in order to solve the above-described problems, and its purpose is to perform injection molding time even when the turntable is rotated 90 ° intermittently to perform molding and take out a finished product. It is another object of the present invention to provide a new rotary vertical injection molding machine that can take out the finished product and can keep the lower mold warm while waiting.

  In the present invention according to the above object, the movable platen is provided so as to be movable up and down above the turntable placed on the fixed platen, and four lower molds are installed at equal intervals on four sides of the turntable, and the stop position of the lower die is set. In order, as a primary molding operation unit, a standby unit, a secondary molding operation unit, and a take-out operation unit, a lower mold of both molding operation units and a plurality of upper molds for closing the mold, and a lower mold of the standby unit and a heat retaining mold for closing the mold It is provided on the movable plate.

  The heat retaining type comprises a heating block with a built-in heater, and a shaft holder fixed to the upper surface of the heating block via a heat insulating material. The heating block is inserted vertically into the movable plate to support the upper end of the shaft. In addition to being connected to the lower end, a spring member is interposed between the movable platen and suspended from the movable plate so as to be movable up and down.

  The movable platen is connected to a plurality of tie bars that are slidably inserted into the four corners of the fixed platen so as to be movable up and down, and is disposed on the primary molding operation unit and the secondary molding operation unit of the movable platen. The primary injection device and the secondary injection device are provided in parallel downward.

  According to the present invention, the upper and lower molds can be closed simultaneously in the primary molding operation section and the secondary molding operation section, and the lower mold and the heat retaining mold can be closed simultaneously in the standby section, and the mold can be opened by raising the movable platen after the injection molding. Since the lower mold of the standby part is kept warm, the shrinkage of the primary molded product due to the cooling of the lower mold during standby is prevented. When the secondary molding material is a thermosetting resin, the mold temperature rise time after transfer to the secondary molding operation section can be shortened, and the work at the take-out operation section can be completed during the molding time. It also shortens the molding cycle.

  In addition, since the spring member is compressed by the movable plate and the heat retaining die is in contact with the lower die, even if it is provided on the movable plate together with the pair of upper dies, the height position is set so that the die is closed before the upper die. If adjusted appropriately, there is no problem in closing and clamping of the upper mold and the lower mold in both molding operation sections, and the lower mold can be reliably kept warm in the standby section.

  In the figure, reference numeral 1 denotes a fixed plate having a rectangular shape placed on the machine base, 2 a circular turntable provided on the fixed plate, 3 a movable plate having the same shape as the fixed plate 1, and four corners of the fixed plate 1 It is connected to the upper ends of tie bars 4 and 4 that are slidably inserted into the section, and is provided above the turntable 2 so as to be movable up and down. Although not shown in the drawing, a tractor is connected to the lower ends of the tie bars 4 and 4 in the machine base, and a mold clamping mechanism is provided between the tractor and the fixed platen.

  On the table of the turntable 2, four lower molds 5a, 5b, 5c, 5d are installed at equal intervals in all directions, and the lower mold stop positions are primary molded in order clockwise from the front left side. As the part A, the standby part B, the secondary molding operation part C, and the take-out operation part D, the turntable 2 is rotated intermittently (90 ° rotation).

  Below the movable platen 3 are a lower mold 5a for the primary molding operation section A, a lower mold 5c for the secondary molding operation section C, a pair of upper molds 6 and 7 and a lower mold 5b for the standby section B. And a heat retaining mold 8 that closes the mold, and the height position is adjusted so that the mold is closed simultaneously with the lower molds 5a, 5c, and 5b by lowering the movable platen 3 by pulling the tie bars 4 and 4. It is provided. Further, a primary injection device 9 and a secondary injection device 10 are installed in parallel downward on the primary molding operation unit A and the secondary molding operation unit C of the movable platen 3.

  As shown in FIG. 5, the heat retaining mold 8 includes a heating block 82 including a heater 81 and a plurality of shaft holders 84 on a seat plate fixed to the upper surface of the block via a plate-like heat insulating material 83. . The shaft holder 84 includes a plurality of shafts 12 that are inserted into a plurality of vertical holes 3 a that are drilled in parallel with the movable platen 3 so as to be movable up and down, and whose upper ends are supported on the movable platen 3 by the set collar 11. The lower ends are connected to each other through a coil spring member 13 interposed between the movable platen 3 and the block.

  With this shaft 12 and coil spring member 13, the heat retaining die 8 is suspended below the movable plate 3 along with the upper dies 6 and 7 so as to be elastically movable up and down, and the height of the suspending position is also set collar 11. By changing the fastening position, the projecting length of the shaft 12 from the movable platen 3 can be adjusted. Further, the heat retaining mold 8 is suspended from the movable plate 3 with a lower height than the upper molds 6 and 7 which are set to the same height as the lower molds 5a and 5c. The upper molds 6 and 7 can be closed prior to the lower mold 5b.

  In the above configuration, after the turntable 2 rotates 90 degrees and stops, the movable platen 3 is pulled by the tie bars 4 and 4 and descends as shown in FIG. Due to this lowering, the lower mold 5b of the standby section B and the heat retaining mold 8 come into contact with each other first, and the coil spring member 13 is compressed by the movable platen 3. The movable platen 3 further lowers the compression allowance and performs mold closing and clamping of the upper molds 6 and 7 and the lower molds 5a and 5c. However, the heat retaining mold 8 and the lower mold 5b are not subjected to mold clamping force by the movable platen 3, and as shown in FIG. 5, the heating block 82 is moved until the movable platen 3 is lifted by the elastic force of the compressed coil spring member 13. Presses the opening of the lower mold 5a and closes it. Therefore, even if the lower mold 5b and the heat retaining mold 8 are in contact with each other first, there is no obstacle to mold clamping by the movable platen 3.

  In the primary molding operation section A after mold clamping, molten resin is injected and filled from the primary injection device 9 into the cavity formed by the upper mold 6 and the lower mold 5a, and primary molding of the half molded product 20 'is performed. Is called. At the same time, in the secondary molding operation section C, another molten resin is injected from the secondary injection device 10 into the cavity formed between the half-molded product 20 ′ transferred together with the lower mold 5 c and the upper mold 7. Filling and secondary molding of the complementary molded product 20 ″ are performed to complete the composite molded product 20 by integrating both molded products. If the secondary molding material is a thermosetting resin such as silicon, the secondary molding operation is performed. In part C, the mold temperature is raised.

  In the standby section B, the lower mold 5b transferred from the primary molding operation section A together with the half-molded product 20 ′ in the mold is prevented from being cooled by heat dissipation by heat transfer from the contacting heating block 82. Is done. Thereby, even if the waiting time determined by the injection molding time is long, the shrinkage of the half-molded product 20 'due to the cooling of the lower mold 5b is prevented, and the dimensional accuracy of the primary-molded half-molded product 20' is maintained.

  In the take-out operation part D, the finished product 20 is taken out from the lower mold 5d. Since there is no upper mold in the take-out operation part D, the take-out operation can be performed even when the movable platen 3 is lowered, and the finished product 20 is taken out after the secondary molding material is deburred with a thermosetting resin. However, since the work is shorter than the injection molding time, it can be completed before the mold is opened, so the take-out work time, which has been set separately from the molding time so far, is omitted, and that time is shortened the molding cycle time. Become.

  When molding is completed, the movable platen 3 is pushed up by the tie bars 4, 4, and the upper molds 6, 7 and the heat retaining mold 8 are raised together to open the mold. At this time, the heat retaining die 8 is kept in contact with the lower die 5b until the shaft 12 is supported by the movable platen 3 by the set collar 11 and pulled up by the coil spring member 13 which originally extends as the movable platen 3 rises. .

  When the ascent of the movable platen 3 stops, the turntable 2 rotates 90 ° clockwise after the mold opening and stops. As a result, the lower mold 5a is placed in the standby section B together with the half-molded product 20 'released from the upper mold 6, and the lower mold 5b is placed in the secondary molding operation section C together with the previously molded half-molded product 20'. 5c is moved to the take-out operation part D together with the composite molded product 20 released from the upper mold 7, and the lower mold 5d is moved to the primary molding operation part A. Then, mold closing and mold clamping are performed again by lowering the movable platen 3, and the next injection molding operation is started.

It is a front view of the rotary injection molding machine concerning this invention. It is a top view of a turntable. It is the side view which excised part on the primary shaping operation part side. It is a front view of the rotary injection molding machine at the time of lowering the movable platen. It is the side view which excised a part by the side of the primary shaping | molding operation part which shows the mold closing state of a heat retention type | mold and a lower mold | type, and an upper mold | type and a lower mold | type.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixed platen 2 Turntable 3 Movable platen 4 Tie-bar 5a, 5b, 5c, 5d Lower mold | type 6,7 Upper mold | type 8 Thermal insulation type 11 Set collar 12 Shaft 13 Coil spring member 20 Composite molded product 81 Heater 82 Heating block 83 Thermal insulation 84 Shaft holder

Claims (3)

  A movable platen can be moved up and down above the turntable placed on the fixed platen, and four lower molds are installed at equal intervals on all four sides of the turntable. The movable platen is provided with a lower mold and a plurality of upper molds for closing the molds, and a lower mold and a heat retaining mold for closing the standby parts as a part, a secondary molding operation part, and a take-out operation part. A rotary vertical injection molding machine characterized by that.   The above heat retaining type comprises a heating block with a built-in heater and a shaft holder fixed to the upper surface of the heating block via a heat insulating material. The lower end of the shaft that supports the upper end by vertically passing the heating block through the movable platen. 2. The rotary vertical injection molding machine according to claim 1, wherein the rotary vertical injection molding machine is connected to the movable platen, and is suspended from the movable platen with a spring member interposed between the movable platen and the movable platen.   The movable platen is connected to a plurality of tie bars that are slidably inserted into the four corners of the fixed platen, and is provided so as to be movable up and down. The rotary vertical injection molding machine according to claim 1, wherein the injection device and the secondary injection device are provided in parallel downward.

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