JP2010089463A - Injection molding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve space-saving of an installation space of a whole injection molding apparatus. <P>SOLUTION: The injection molding apparatus includes: a die device 20 which has a pair of dies 21, 22 internally forming a cavity 27 by die-closing and in which a runner 28 is provided along parting faces 23A, 23B of the dies 21, 22 in a die-closed state and the inlet port of the runner is opened on the outer peripheral side of the parting faces 23A, 23B while the outlet port of the runner 28 is made to communicate with the inside of the cavity 27; each injection device 30 which is located at a position offset from the center line L passing the center of the die device 20, with respect to the die device 20 so as to inject a molten resin from the tip of a cylinder 31; and each almost-L-shaped injection nozzle 40 whose one end is connected to the tip of the cylinder 31 while whose the other end is brought into pressure contact with the inlet port of the runner 28 so as to feed the molten resin from the injection device 30 to the inside of the runner 28. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an injection molding apparatus.

  Conventionally, as an injection molding apparatus including a mold apparatus in which a cavity is formed by closing a pair of molds, for example, an injection molding apparatus described in Patent Document 1 is known. In this injection molding apparatus, a runner is provided along the mating surface of the mold when the mold is closed. The runner inlet opens to the outer peripheral side of the mating surface, and the runner outlet communicates with the cavity.

  In such an injection molding apparatus, since the injection nozzle must be brought into linear contact with the mating surface, the injection apparatus is arranged orthogonal to a center line passing through the center of the mold apparatus. FIG. 6 and FIG. 7 specifically explain such an arrangement. In the following description, the direction in which the center line extends through the center of the mold apparatus is defined as the X direction, and the direction orthogonal to the center line is defined as the Y direction.

The injection molding apparatus shown in FIG. 6 includes a mold apparatus 2 having a pair of molds 1 arranged in the X direction, and an injection apparatus 3 arranged in the Y direction orthogonal to the mold apparatus 2. Has been. The injection molding apparatus of FIG. 7 has a mold apparatus 2 similar to that of FIG. 6, and a pair of injection apparatuses 3 orthogonal to the mold apparatus 2 are arranged on both sides in the Y direction of the mold apparatus 2. Yes.
JP 2000-301570 A

  However, since the Y dimension of the injection molding apparatus in FIG. 6 is Y1 + Y2, and the Y dimension of the injection molding apparatus in FIG. 7 is Y1 + 2Y2, both dimensions in the Y direction are very long. In particular, in an injection molding apparatus for molding a vehicle interior material, since Y2 is about 5 m, the injection apparatus 3 protrudes about 5 m on one side of the mold apparatus 2 in the case of FIG. 6, and the injection apparatus in the case of FIG. 3 protrudes about 10 m in total on both sides of the mold apparatus 2. Thus, a very large installation space is required as a whole when installing the injection molding apparatus.

  The present invention has been completed based on the above circumstances, and an object thereof is to save the installation space of the entire injection molding apparatus.

  The present invention has a pair of molds in which a cavity is formed by closing the mold, and an inlet of a runner provided along the mold mating surface in the mold closed state opens to the outer peripheral side of the mating surface The runner outlet communicates with the inside of the cavity, and the mold device is disposed at a position offset from the center line passing through the center of the mold device and injects the molding material from the tip of the cylinder. The apparatus and a substantially L-shaped injection nozzle for feeding molding material from the injection device into the runner by connecting one end to the tip of the cylinder and pressing the other end to the inlet of the runner It has the characteristics.

  According to such a configuration, since the injection device is arranged at a position offset with respect to the mold device, the injection device does not protrude in a direction perpendicular to the center line passing through the center of the mold device, and the injection molding is performed. An increase in the size of the entire apparatus can be avoided. Therefore, space saving of the installation space of the whole injection molding apparatus can be realized.

The following configuration is preferable as an embodiment of the present invention.
The injection device is configured such that a cylinder protrudes from the tip of the base portion, the cylinder is disposed on the side of the mold device, and the base portion is disposed on the rear side in the opening / closing direction of the mold device. It is good also as a structure.
According to such a configuration, since the base portion can be arranged using the space on the rear side in the opening / closing direction of the mold apparatus, the installation space can be more efficiently saved.

It is good also as a structure provided with the chuck | zipper apparatus which presses the other end of an injection nozzle to the inlet of a runner with the reaction force produced by holding | griping and pulling the protrusion part provided and protruded from the metal mold | die.
According to such a configuration, a reaction force that presses the mold side is generated by gripping and pulling the protruding portion of the mold by the chuck device, and the other end of the injection nozzle is pressed against the inlet of the runner by this reaction force. Therefore, it is possible to cope with the supply pressure of the molding material and prevent material leakage.

  According to the present invention, the installation space of the entire injection molding apparatus can be saved.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to the drawings of FIGS. The injection molding apparatus 10 includes a mold apparatus 20, a mold clamping apparatus (not shown), an injection apparatus 30, an injection nozzle 40, a gantry (not shown), and the like. In this embodiment, the mold apparatus is used. 20, only the injection device 30 and the injection nozzle 40 are shown.

  The mold apparatus 20 has a pair of molds 21 and 22 arranged along the mold opening / closing direction. 21 indicates a fixed mold, and 22 indicates the left side of the fixed mold 21 (the leftward direction in FIG. 1 is the left side, and the downward direction in FIG. 1 is the front side. , Follow this direction).

  The left side surface of the fixed mold 21 is a parting surface (corresponding to the “mating surface” of the present invention) 23A, and the right side surface of the movable mold 22 corresponds to the parting surface (the “mating surface” of the present invention). ) It is 23B. The parting surface 23A of the fixed mold 21 and the parting surface 23B of the movable mold 22 constitute one parting line 23.

  Reference numeral 24 denotes a fixed-side mounting plate fixed to a gantry (not shown), and a fixed die 21 is mounted on the left side surface of the fixed-side mounting plate 24. Reference numeral 25 denotes a movable side mounting plate, and a movable mold 22 is mounted on the right side surface of the movable side mounting plate 25.

  The right end of a tie bar 26 extending in the left-right direction is fixed to the four corners at the upper and lower ends of the fixed mold mounting plate 24, and the movable side mounting plate 25 is slidably supported on the tie bar 26. Further, a mold clamping device (not shown) using a hydraulic cylinder, an air cylinder, or a servo motor as a drive source is disposed on the left side of the movable mounting plate 25. By this mold clamping device, the movable side mounting plate 25 and the movable mold 22 are arranged. Are integrally moved in the left-right direction.

  On the parting surface 23A of the fixed mold 21, a cavity constituting portion 27A and a runner constituting portion 28A are formed. On the other hand, the parting surface 23B of the movable mold 22 is formed with a cavity constituent part 27B that constitutes the cavity 27 together with the cavity constituent part 27A. Further, the parting surface 23B of the movable mold 22 is formed with a runner constituting part 28B that constitutes the runner 28 together with the runner constituting part 28A.

  Therefore, when the fixed mold 21 and the movable mold 22 are closed, the cavity 27 including both the cavity constituent portions 27A and 27B is configured, and the runner 28 including both the runner constituent portions 28A and 28B is configured. The inlet of the runner 28 opens to the outer peripheral side of the parting line 23, and the outlet of the runner 28 communicates with the cavity 27.

  A pair of injection devices 30 are arranged on both front and rear sides of the mold device 20. Specifically, the two injection devices 30 are arranged in parallel at positions offset to the front and rear sides from a center line L passing through the center of the mold device 20 in the left-right direction. The injection device 30 has a configuration in which a cylinder 31 protrudes from the tip of a base portion 32. Specifically, the injection device 30 includes a base portion 32 disposed on the right side of the fixed mold 21, a cylinder 31 disposed adjacent to the front and rear of the fixed mold 21, and a screw shaft ( And a substantially L-shaped injection nozzle 40 connected to the tip of the cylinder 31.

  As shown in FIG. 3, one end (right end) of the injection nozzle 40 is screwed to the tip of the cylinder 31 with a plurality of bolts 44. In addition, since both the injection nozzles 40 arranged in the front and rear are arranged symmetrically and have the same structure, the front injection nozzle 40 will be described below as a representative. As shown in FIG. 2, a first flow path 41 </ b> A that communicates with the inside of the cylinder 31 is formed inside the injection nozzle 40. As a result, the molten resin fed from the cylinder 31 (corresponding to the “molding material” of the present invention) is fed to the tip side through the first flow path 41A.

  The other end (rear end) of the injection nozzle 40 is attached with a valve member 42 that is pressed against the inlet of the runner 28. Inside the valve member 42, a second channel 41B that connects the first channel 41A and the runner 28 is formed. The distal end portion of the second flow path 41B has a form in which the front end becomes narrower toward the distal end side. The tip opening of the second channel 41B can be closed by abutting the tip of the needle pin 43 against the tip of the second channel 41B. In addition, the flow rate of the molten resin fed into the runner 28 can be adjusted by adjusting the opening between the tip of the second flow path 41B and the needle pin 43. A pin driving unit 45 that drives the needle pin 43 is integrally attached in front of the corner of the injection nozzle 40.

  A chuck device 50 for pressing the valve member 42 attached to the tip of the injection nozzle 40 against the inlet of the runner 28 is attached to the upper surface of the corner portion of the injection nozzle 40. The chuck device 50 has a function of gripping and pulling a protruding portion 29 provided protruding from the fixed mold 21. The chuck device 50 is fixed to the upper surface of the injection nozzle 40 by a plurality of bolts 51.

  Specifically, the chuck device 50 includes a pair of locking arms 52 that hold the step 29A protruding from the front end portion of the protruding portion 29 on both the left and right sides and lock in the front-rear direction, and a base of the both locking arms 52. A support plate 53 that rotatably supports the end portion, a plate driving portion 54 that drives the support plate 53 in the front-rear direction, and the like are provided. Accordingly, as shown in FIG. 4, the protrusion 29 is pulled in the direction away from the fixed mold 21 by the chuck device 50 (the direction of the arrow A <b> 2 in FIG. 4) to approach the fixed mold 21 (the arrow line in FIG. 4). A reaction force is generated in the direction (A1), and the valve member 42 can be pressed against the inlet of the runner 28 via the injection nozzle 40 by this reaction force.

  Next, the operation of the injection molding apparatus 10 will be described. When a mold closing command is issued from the mold opening state, the fixed mold 21 and the movable mold 22 are closed, and an inlet of the runner 28 is formed on the outer peripheral side of the parting line 23. At the same time, a cavity 27 is formed inside both molds 21, 22, and the exit of the runner 28 communicates with the cavity 27. In this state, the valve member 42 attached to the tip of the injection nozzle 40 faces the inlet of the runner 28.

  When the mold closing is completed in this way, the injection device 30 approaches the mold device 20 at a predetermined timing, and the valve member 42 contacts the inlet of the runner 28. Next, as shown in FIG. 4, the step 29A of the protruding portion 29 is sandwiched from both the left and right sides by the both locking arms 52, and the supporting plate 53 is pulled in the direction of the arrow A2 so that the both locking arms 52 and the step 29A are separated. Lock in the front-rear direction. At the same time, a reaction force is generated in the direction of the arrow line A1, and the valve member 42 is pressed against the inlet of the runner 28 by this reaction force.

  When it is detected that the press contact is completed, the screw shaft advances to inject molten resin into the cavity 27. That is, the molten resin in the cylinder 31 is injected into the runner 28 through the first flow path 41A and the second flow path 41B, and the injected molten resin is injected into the cavity 27 through the gate. After the molten resin is injected into the cavity 27, the valve member 42 is held in pressure contact with the inlet of the runner 28 until a predetermined pressure holding time elapses.

  When the molten resin in the cavity 27 is cooled and solidified, a product P is formed. At a predetermined timing, the pressure contact state by the chuck device 50 is released as shown in FIG. 5, the injection device 30 is separated from the mold device 20, and the mold is opened. Done. When the mold opening is completed, an ejector pin (not shown) moves forward, pushes out the product P from the cavity 27, and waits for the next mold closing command.

  As described above, in the present embodiment, since the injection device 30 is arranged in parallel on both the front and rear sides of the mold device 20, the entire injection molding device 10 is not enlarged in the front-rear direction, and the installation space for the injection molding device 10 is saved. can do. In addition, since the base portion 32 is disposed on the right side of the fixed die 21 and the cylinders 31 protruding from the tip of the base portion 32 are disposed on both the front and rear sides of the fixed die 21, space can be saved more efficiently. Further, since the chuck device 50 is provided, the valve member 42 attached to the tip of the L-shaped injection nozzle 40 can be pressed against the inlet of the runner 28 with a strong force, so that it can cope with the supply pressure of the molding material. , Material leakage can be prevented.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  (1) In this embodiment, although a pair of injection device 30 is installed on both front and rear sides of the mold device 20, according to the present invention, one injection device 30 is provided on either side of the mold device 20 in the front-rear direction. May be installed.

  (2) Although the L-shaped injection nozzle 40 is provided in the present embodiment, an arc-shaped injection nozzle may be provided according to the present invention.

  (3) Although the present embodiment illustrates the injection device 30 in which the cylinder 31 protrudes from the tip of the base portion 32, according to the present invention, the base portion 32 and the cylinder 31 are integrated into a box as a whole. An injection device having a shape may be used.

  (4) Although the chuck device 50 is provided on the upper surface of the injection nozzle 40 in the present embodiment, the chuck device 50 may be provided on the gantry according to the present invention.

The top view of the injection molding device in this embodiment 1 is a partially cutaway enlarged cross-sectional view of the injection nozzle in FIG. 1 is an enlarged perspective view of the chuck device in FIG. FIG. 1 is an enlarged plan view showing a state where the tip of the injection nozzle is pressed against the runner inlet in the chuck device in FIG. The top view which expanded and showed the state which canceled the holding state by the chuck device in FIG. The top view which showed the state which has arrange | positioned one injection apparatus on the one side of the mold apparatus in the conventional structure Plan view showing a state in which two injection devices are arranged on both sides of a mold device in a conventional structure

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Injection molding apparatus 20 ... Mold apparatus 21 ... Fixed mold (mold)
22 ... Movable type (mold)
23A ... Parting surface (mating surface)
23B ... Parting surface (mating surface)
27 ... Cavity 28 ... Runner 30 ... Injection device 31 ... Cylinder 32 ... Base part 40 ... Injection nozzle 50 ... Chuck device

Claims (3)

It has a pair of molds in which a cavity is formed by closing the mold, and an inlet of a runner provided along the mating surface of the mold in the mold closed state opens to the outer peripheral side of the mating surface. A mold apparatus in which the outlet of the runner communicates with the cavity;
An injection device that is disposed at a position offset from a center line passing through the center of the mold device with respect to the mold device, and injects a molding material from the tip of the cylinder;
Injection molding comprising a substantially L-shaped injection nozzle that feeds the molding material from the injection device into the runner by having one end connected to the tip of the cylinder and the other end pressed against the inlet of the runner apparatus. The injection device is configured such that the cylinder protrudes from a tip of a base portion, the cylinder is disposed on a side of the mold device, and the base portion is located in the opening / closing direction of the mold device. The injection molding apparatus according to claim 1, wherein the injection molding apparatus is disposed on a side. 3. The chuck device according to claim 1 or 2, further comprising a chuck device that presses the other end of the injection nozzle against the inlet of the runner by a reaction force generated by gripping and pulling a protruding portion provided protruding from the mold. The injection molding apparatus described.

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