JP2007075999A - Injection molding machine and injection molding system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection molding machine capable of easily increasing an injection device or capable of altering the injection device to an injection device proper in injection capacity without remolding the main body of the injection molding machine for a single material. <P>SOLUTION: The injection device 10 is integrally attached to a fixed mold 40. The injection device 10 comprises a first cylinder 11 for melting a resin material to meter the same and a second cylinder 12 for injecting the molten resin supplied from the first cylinder 11. The second cylinder 12 is supported so as to be movable with respect to the fixed mold 40. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an injection molding machine, and more particularly to an injection molding machine having a plurality of injection devices.

  Resin molded products are generally molded using a single resin, but are formed by injecting multiple types of resin into one mold using resins of different colors and materials as part of the molded product. The demand for so-called multi-material molded products is increasing. An example of a multi-material molded product is a plastic switch cover in which a colored pattern is integrally molded with a colored resin on the surface.

  In order to mold a multi-material molded product, it is necessary to inject a plurality of types of resins into one mold. For this reason, in the conventional molding method, generally, for example, two injection devices are provided around the mold clamping device of the injection molding machine, and the two injection devices are alternately connected to the mold attached to the mold clamping device. Inject resin.

  In such a conventional multi-material molding injection molding machine, for example, two injection devices are arranged side by side so that their axes are parallel, and two same molds are provided in the clamping device, each having one. Two types of resins are injected into each of the molds by arranging them side by side so as to be in a position corresponding to the injection device. In this case, the two molds are rotated 180 degrees around the middle thereof so that the two molds alternately face the two injection devices.

It has also been proposed to arrange two injection devices so that their axes are orthogonal (see, for example, Patent Document 1). In this case, one injection device is arranged so as to coincide (parallel) with the axis of the mold clamping device as usual, while the other injection device arranged so as to be orthogonal thereto is a mold. It arrange | positions so that resin may be inject | poured from the side surface.
JP-A-7-144356

  An injection molding machine having two or more injection devices as described above is configured by arranging a plurality of conventional injection devices on one injection molding machine.

  In many multi-material molded products, the ratio of the portions formed of different types of resins is small with respect to the portions formed of one resin as the base material. For example, a black plastic switch cover may display a pattern with a red resin, for example, different from the black base resin. In this case, the volume of the red pattern resin is very small compared to the volume of the black base resin occupying one molded product.

  When the above-described switch is molded by a conventional multi-material molding injection molding machine, an injection device having a large injection capacity is used even though the injection amount of red resin per injection is very small. In other words, conventional multi-material molding injection molding machines are provided with a plurality of fixed injection devices having almost the same injection capability, making it easy to match the type and amount of resin used. It cannot be changed. Moreover, in order to replace the injection device, a major modification is required. Further, when the injection device is hydraulically driven, there is a possibility that the hydraulic hose may interfere with the driving portion of the molding machine.

  In addition, when a resin with a small injection amount per injection is injected by an injection device having a large injection capacity, the resin stays for a long time while being heated in the injection device. This may cause a problem that the resin deteriorates in the injection apparatus.

  Furthermore, a conventional multi-material molding injection molding machine has a problem in that a plurality of large injection devices are provided, so that the entire injection molding machine including the mounting device is enlarged.

  In addition, the conventional injection molding machine for multi-material molding has a problem that the number of injection devices is fixed, and it is not possible to increase the number of injection devices or a large amount of modification is required to increase the number of injection devices. .

  The present invention has been made in view of the above-mentioned problems, and can easily add an injection device or change to an injection device having an appropriate injection capacity without modifying the main body of a single-material injection molding machine. It is an object of the present invention to provide an injection molding machine that can perform such a process.

  To achieve the above object, according to the present invention, there is provided an injection molding machine having an injection device integrally attached to a mold, wherein the injection device is an electric injection device. A molding machine is provided.

  In the injection molding machine according to the present invention, the injection device includes a first cylinder that melts and measures a resin material, a second cylinder that injects a molten resin supplied from the first cylinder, and the second cylinder. It is preferable to have an attachment mechanism that supports the cylinder in a movable manner with respect to the mold. In addition, the attachment mechanism may be configured such that the second cylinder is fixed to the fixed mold such that an injection nozzle at the tip of the second cylinder faces a portion on the outer peripheral surface of the mold that is on the inner side of the mold alignment surface. It is preferably configured to be attached to the outer peripheral surface. Further, it is preferable that the attachment mechanism has a support member provided at a position opposed to the second cylinder and the second cylinder is supported by the support member at both ends. Furthermore, the injection molding machine according to the present invention includes a fixed platen for mounting the fixed mold of the mold, and a third cylinder having a nozzle portion that contacts the fixed mold through a hole provided in the fixed platen. It is good also as having. A movable platen for mounting a movable mold facing the fixed mold of the mold; a mold clamping drive unit for moving the movable platen forward and backward; and a control unit for transmitting a signal to the mold clamping drive unit; The control unit may transmit a signal to the injection device.

  According to the above-described injection molding machine according to the present invention, the injection device is integrally attached to the fixed mold. Therefore, without modifying the injection molding machine main body, it is possible to easily add other injection devices in addition to the original injection device by slightly changing the fixed mold. In addition, the injection device attached to the fixed mold is a pre-plastic electric injection device, which is very compact and does not require hydraulic piping. Therefore, even if the injection device is attached to the fixed mold, there is almost no portion that interferes with other parts. Also, since the injection device attached to the fixed mold can be easily attached to the fixed mold, the injection device can be easily replaced to have an injection device with a different injection capacity, and has the necessary minimum injection capacity. Can be added. Thereby, the residence time of the resin in the injection device is reduced, and deterioration of the molten resin can be prevented.

  Furthermore, since the additional injection device is attached to the fixed mold, a two-material injection molding machine can be easily configured simply by attaching the injection device to the fixed mold mounted on the single material injection molding machine. be able to.

  Further, according to the injection molding system of the present invention, it is possible to construct an injection molding system for molding a multi-material molded product with a simple configuration by simply attaching an injection device to each of two fixed molds. .

  First, an injection apparatus according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a side view of an injection apparatus according to a first embodiment of the present invention. An injection apparatus 10 is attached to a fixed mold attached to a fixed platen of an injection molding machine.

  In FIG. 1, an injection device 10 is attached to a fixed mold 50 attached to a fixed platen 40 of a single material injection molding machine. The injection molding machine is provided with an original injection device including the screw cylinder 42 shown in the figure. In FIG. 1, the fixed platen 40, the screw cylinder 42, and the fixed mold 50 are shown as viewed from above. Therefore, in FIG. 1, the injection device 10 according to the present embodiment is attached to the side surface 50 a of the fixed mold 50.

  The injection nozzle 44 provided at the tip of the screw cylinder 42 of the original injection device moves back and forth through the central opening of the fixed platen 40 and can contact the first nozzle touch portion 51 of the fixed mold 50. It is. The first nozzle touch part 51 is connected to the cavity 53 via the first sprue 52, and the molten resin injected from the injection nozzle 44 of the screw cylinder 42 into the first nozzle touch part 51 is the first The cavity 53 is filled through the sprue 52.

  The single material injection molding machine including the configuration of the original injection apparatus has the same configuration as the conventional single material injection molding machine, and illustration and description thereof are omitted.

  The injection device 10 according to the present embodiment is a so-called pre-plastic injection device, and a resin measured and melted in the screw cylinder 11 is supplied to the plunger cylinder 12 and pressurized by the plunger 13 from the injection nozzle 14 at the tip. It is injected into the fixed mold 50. That is, the second nozzle touch part 54 is provided on the side surface 50 a of the fixed mold 50, and the molten resin is injected into the fixed mold 50 while pressing the injection nozzle 14 against the second nozzle touch part 54. . The molten resin from the injection device 10 is connected to the cavity 53 through the second nozzle touch part 54 and the second sprue 55.

  A core back mechanism 57 is disposed in the movable mold 56. The core back mechanism 57 has a shut-off function for bringing the second sprue 55 into a communication state or a non-communication state. The state of FIG. 1 is a state in which the second sprue 55 is in a non-communication state and the resin is filled into the cavity space from the first sprue 52. When the filling of the first resin is completed, the piston 57b disposed in the cylinder 57a and the slide core 57c integrally connected to the piston 57b perform the retreating operation, and the second sprue 55 and the cavity space are in communication with each other. It becomes. Thereafter, the second resin is filled into the cavity space from the injection device 10. Further, the drive unit of the core back mechanism 57 may be disposed not only in the movable mold 56 but also on the movable platen.

  In FIG. 1, the screw cylinder 11 is disposed so as to be inclined above the plunger cylinder 12 (that is, in the vertical direction of the paper surface), and is connected to the distal end portion of the plunger cylinder 14 via a cylinder connecting portion 12a. The screw in the screw cylinder 12 is rotationally driven by a measuring motor 15, and the resin pellet supplied from the hopper hole 11a is measured and melted by the rotation of the screw.

  The plunger cylinder 12 is fixed to the front flange 16. And the plunger 13 extended from the back of the plunger cylinder 12 penetrates the front side flange 16, and is being fixed to the pressure plate 17 supported so that the back-and-forth movement was possible. Therefore, the plunger 13 can be moved back and forth within the plunger cylinder 12 by moving the pressure plate 17 back and forth.

  A rear flange 19 is fixed to the opposite side of the front flange 16 with the pressure plate 17 interposed therebetween via two guide bars 18. The pressure plate 17 is slidably supported on the guide bar 18 and configured to be movable back and forth.

  The injection motor 20 as an electric drive portion of the plunger is fixed to the rear flange 19 with the output shaft facing the non-plunger side. The ball screw shaft 21 is rotatably supported by the rear flange 19. An injection belt 22 is stretched between a pulley attached to the tip of the ball screw shaft 21 and the shaft of the injection motor 20, and the ball screw shaft 21 can be rotated by driving the injection motor 20. .

  A nut 23 fixed to the pressure plate 17 is engaged with the ball screw shaft 21, and the nut 23, that is, the pressure plate 17 can be moved back and forth by rotating the ball screw shaft 21, whereby the plunger 13 Can be moved back and forth. Here, by moving the ball screw shaft 21 and the nut 23 together, a motion direction conversion mechanism capable of converting a rotational motion into a linear motion is configured.

  At a position off the center of the front flange 16, the ball screw shaft 24 is supported so as to be slidable in the front-rear direction with respect to the front flange 16 without rotating. The ball screw shaft 24 extends toward the fixed mold 50 at a position where it does not interfere with the plunger cylinder 12, and its tip extends to the inside of the housing 25 fixed to the fixed mold 50.

  Between the nut 23 and the pressure plate 17, a load cell 29 as a resin pressure detector for detecting the resin pressure applied to the plunger 13 is provided. The load cell 29 can detect the filling pressure in the mold and control the pressure.

  In addition, although an example using a rotary motor and a ball screw mechanism is shown in FIG. 1, a linear motor may be used. In this case, the linear motor is fixed to the rear flange, and the pressure plate 17 is moved forward and backward as the output shaft of the linear motor advances and retreats.

  FIG. 2 is an enlarged sectional view showing the inside of the housing 25. As shown in FIG. 2, the tip of the ball screw shaft 24 has two steps, and a screw is cut at the root of the small diameter portion 24a and the nut 26 is engaged. The nut 26 serves as a flange for fixing the ball screw shaft to the housing 25.

  The small diameter portion 24 a of the ball screw shaft 24 is slidably inserted into the through hole 25 a of the housing 25 and extends to the inside of the housing 25. Inside the housing 25, a plurality of disc springs 27 are provided in the small diameter portion 24 a of the ball screw shaft 24, and a screw is cut at the tip of the small diameter portion 24 a to engage the nut 28. The disc spring 27 is configured to be preloaded and compressed in a state in which the nut 28 is tightened, and the housing 25 is sandwiched between the nut 26 and the nut 28. Thereby, the ball screw shaft 24 is maintained in a state supported by the housing 25.

  Referring again to FIG. 1, a nut 30 is engaged with the ball screw shaft 24, and the nut 30 is rotatably supported by the front flange 16. The nut 30 is rotationally driven by a nozzle touch motor 31 as a nozzle touch drive unit fixed to the front flange 16.

  When the nut 30 is rotationally driven by the nozzle touch motor 31 and attempts to retract the ball screw shaft 24 (that is, moves away from the fixed mold 50), the nut 30 is moved by the nut 28 attached to the ball screw shaft 24. Is blocked. As a result, the entire injection apparatus 10 including the nut 30 moves forward toward the fixed mold 50.

  When the nut 30 is further rotated after the injection nozzle 14 of the plunger cylinder 12 contacts the second nozzle touch portion 54 of the fixed mold 50, the ball screw shaft 24 is retracted while compressing the disc spring 27, and is predetermined. When the disc spring 27 is deflected by the given amount, the rotation of the motor stops and the position is maintained. The compression force of the disc spring 27 at this time becomes the nozzle touch pressure of the injection nozzle 14.

  Here, normally, the state where the nozzle is touched to the mold is always maintained during molding, but in this case, the heat capacity of the plunger cylinder 12 to which the injection device is attached is relatively small, so that the touched state is maintained. Is maintained, the heat of the plunger cylinder is transferred to the mold through the nozzle 14. Therefore, it is desirable to perform the backward molding in which the nozzle touch operation is repeated for each molding.

  As described above, the injection apparatus 10 according to the present embodiment can be attached to the fixed mold 50 with a simple configuration in which the housing 50 is fixed to the side surface 50 a of the fixed mold 50. Therefore, the injection device 10 can be easily added to the injection device 10 in addition to the original injection device by slightly changing the fixed mold 50 without any modification to the injection molding machine main body.

  Further, the injection device 10 is a pre-plastic electric injection device, is very compact without requiring hydraulic piping, and has almost no part that interferes with other parts when attached to the fixed mold 50. In the present embodiment, the injection device 10 is a small injection capacity injection device, which is suitable when the amount of resin injection per time is small.

  In addition, since the injection device 10 can be easily attached to the fixed mold 50, it can be easily replaced to obtain an injection device having a different injection capacity, and an injection device having a minimum injection capacity can be added. Can do. Thereby, the residence time of the resin in the injection device 10 is reduced, and deterioration of the molten resin can be prevented.

  Furthermore, since the injection device 10 is attached to the fixed mold 50, it is easy to make a two-material injection molding machine simply by attaching the injection device 10 to the fixed mold 50 to be mounted on a single-material injection molding machine. Can be configured. Further, for example, by similarly attaching the injection device 10 to the side surface or the upper surface opposite to the side surface 50a of the fixed mold 50 in FIG. 1, an injection molding machine for three or four materials can be easily configured. it can.

  Next, an injection device according to a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a side view of an injection apparatus 10A according to the second embodiment of the present invention, showing a state in which the injection apparatus is attached to a fixed mold for an injection molding machine. 3, parts that are the same as the parts shown in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted.

  As is clear from FIG. 3, the injection device 10A according to the present embodiment has basically the same configuration as the above-described injection device 10, but the attachment structure to the fixed mold 50 is supported at both ends. Different. That is, ball screw shafts 24 are provided on both sides of the plunger cylinder 12, and each of them is supported by the housing 50.

  A common belt 32 is stretched between the two nuts 30 and is driven by a single nozzle touch motor 31. As a result, the two nuts 30 rotate synchronously and can move back and forth by the same distance from side to side. Therefore, by using a plurality of nozzle touch mechanisms, the injection device 10A can be moved back and forth while maintaining the perpendicularity of the plunger cylinder 12 with respect to the side surface 50a of the fixed mold 50.

  The injection device 10A according to the present embodiment provides the same effects as those of the injection device 10 according to the first embodiment described above. In addition, the injection device 10A according to the present embodiment has a double-sided structure with respect to the fixed mold, and the plunger cylinder 12 does not tilt when the nozzle touch pressure is applied.

  Further, as shown in FIG. 3, the movable mold may be divided into a movable mold 56F and a movable mold 56R in correspondence with each injection molding machine. In this case, the movable molds 56F and 56R are reversed by a rotary mechanism (not shown). In the example of FIG. 3, first, the first resin is filled through the second sprue 55 from the injection device 10A, and the first layer is molded. Next, when a rotary mechanism (not shown) is driven, the movable molds F and R are reversed, and the cavity filled with the first resin stops at a position facing the first sprue 52. Then, the second resin is filled through the first sprue 52 to form the second layer. As described above, a plurality of layers can be formed by using a reversing mechanism instead of the core back mechanism shown in FIG. Further, since a plurality of nozzle touch mechanisms are provided, stable molding can be maintained even if vibration occurs during the reversing operation.

  Next, an example of the multi-material injection molding machine configured using the injection apparatus 10A according to the second embodiment will be described with reference to FIG. FIG. 4 is a plan view showing a mold clamping device portion when two injection devices 10A are added to a rotary type two-material injection molding machine to constitute a four-material injection molding machine. 4, parts that are the same as the parts shown in FIG. 3 are given the same reference numerals, and descriptions thereof will be omitted. In addition, although the example shown in FIG. 4 uses the injection device 10A according to the second embodiment of the present invention, the injection device 10 according to the first example may be used.

  In FIG. 4, two fixed molds 71 F and 71 R on the F side and R side are attached to the fixed platen 61, and correspondingly, the movable platen 62 is also connected to the F side and R side via the rotary mechanism 63. Two movable molds 72F and 72R are attached. The movable platen 62 is movable along the tie bar 64. In FIG. 4, the plurality of injection devices 10 </ b> A are arranged to face each other, but may be arranged in the same direction. In this case, the installation space can be minimized.

  The rotary mechanism 63 is also referred to as a reversing mechanism, and is a mechanism for rotating the two movable molds 72F and 72R on the movable platen 62 by 180 degrees. The rotary mechanism 63 has a turntable 65 rotatably attached to the movable mold 62, a reversing motor 66, and a reversing belt 67 stretched between the reversing motor 66 and the turning table 65. That is, by rotating the reversing motor 66, the reversing belt 67 transmits the rotational force to the rotating table 65, and the rotating table rotates 180 degrees. In addition, a gear can be used for the rotation transmission of the reversing mechanism instead of the reversing belt 67. In this case, since bending does not occur during acceleration / deceleration, the reversing operation can be performed with high accuracy.

  The molding machine is provided with an injection apparatus having a screw cylinder 68F for injecting resin into the F-side fixed mold 71F and an injection apparatus having a screw cylinder 68R for injecting resin into the R-side fixed mold 71R. ing.

  According to the molding machine described above, various molding methods can be performed.

  For example, when molding a molded product with two colors of resin, a core back mechanism is formed by using a pair of a fixed mold 71F and a movable mold 72F and a pair of a fixed mold 71R and a movable mold 72R as molds having the same shape. When the fixed mold 71F and the movable mold 72F are used, the resin from the screw cylinder 68F is the first color resin, the resin from the injection device 10A is the second color resin, and the fixed mold 71R and the movable mold 71R are movable. On the mold 72R side, the resin from the screw cylinder 68R is the first color resin, and the resin from the injection apparatus 10A is the second color resin. Thereby, two two-color material molding can be performed simultaneously on the F side and the R side. In this case, the rotary mechanism 63 does not need to be operated.

  More specifically, the pair of the fixed mold 71F and the movable mold 72F and the pair of the fixed mold 71R and the movable mold 72R are closed, and the fixed mold 71F, 71R is filled with the first color resin. Then, the first color resin is held and cooled. The resin for the second color is weighed in the injection apparatus 10A during the filling, holding pressure, and cooling of the first color resin. When the pressure holding and cooling of the first color resin is completed, the second color resin is filled into the corresponding fixed molds 71F and 71R from the injection apparatus 10A, and pressure holding and cooling are performed. At this time, the resin for the first color is measured in the screw cylinders 68F and 68R. When the pressure holding and cooling of the second color resin is completed, the pair of the fixed mold 71F and the movable mold 72F and the pair of the fixed mold 71R and the movable mold 72R are opened, and the molded product is taken out. Two two-color material molded articles are formed simultaneously.

  Next, a case where the two-color material is molded without using the injection device having the screw cylinders 68F and 68R will be described. That is, the first color resin is filled in one of the two injection devices 10A, and the second color resin is filled in the other of the two injection devices 10A. In this case, the rotary mechanism 63 is used, but only two injection devices 10A are used as the injection devices.

  Specifically, first, the F-side fixed mold 71F and the F-side movable mold 72F are paired, and the first color resin is filled from the injection apparatus 10A attached to the F-side fixed mold 71F. After holding and cooling the first color resin, after opening the mold, the rotary mechanism 63 is driven to the position where the F-side movable mold 72F is rotated 180 degrees, that is, the position facing the R-side fixed mold 71R. Moving.

  At this time, the formed first color resin moves together with the F-side movable mold 72F while being held by the movable mold 72F. Therefore, when the mold is closed next and the F-side movable mold 72F comes into contact with the R-side fixed mold 71R, the molded first color resin is disposed in the cavity of the R-side fixed mold 71R. It becomes. In this state, the second color resin is filled from the injection device 10A attached to the R-side fixed mold 71R. When the pressure holding and cooling of the second color resin is completed, the mold is opened and the molded product is taken out from the F-side movable mold 72F.

  When the second color resin is molded by the pair of the F-side movable mold 72F and the R-side fixed mold 71R, in the other pair of the R-side movable mold 72R and the F-side fixed mold 71F, The first color resin is molded. Thus, by molding the movable molds 72F and 72R while reversing each time the mold is closed, a two-color molded product can be continuously molded.

  In the above example, the injection device having the screw cylinders 68F and 68R is not used, but if these two injection devices are also used and the reversing mechanism and the core back mechanism are applied, a total of four injection devices are provided. As a result, four-material molding becomes possible.

  The injection devices 10 and 10A described above are preferably controlled by a signal supplied from a control unit that controls a mold clamping drive unit of the injection molding machine.

FIG. 5 is a diagram illustrating an overall configuration of an electric injection molding machine to which the injection device 10 is attached as an example. An electric injection molding machine 100 shown in FIG. 5 includes a frame 110, an injection device 120 and a mold clamping device 150 arranged on the frame 110, and the injection device 10.
The injection device 120 includes a heating cylinder 42. The resin melted in the heating cylinder 42 is filled in the fixed mold 50. The injection device 120 is driven by a plasticizing movement device 140 as a drive mechanism that applies a nozzle touch pressure, and the nozzle at the tip of the heating cylinder 42 is pressed against the fixed mold 50 to apply the nozzle touch pressure.

  The mold clamping device 150 includes a movable platen 152 to which the movable mold 56 is attached, and a fixed platen 40 to which the fixed mold 50 is attached. The lower end of the fixed platen 40 is fixed to the frame 110. The movable platen 152 and the fixed platen 40 are connected by a tie bar 155. The movable platen 152 is slidable along the tie bar 155. Further, the mold clamping device 150 includes a toggle mechanism 157 having one end connected to the movable platen 152 and the other end connected to the toggle support 156. A ball screw shaft 159 is rotatably supported at the center portion of the toggle support 156.

  A nut 161 formed on a cross head 160 provided in the toggle mechanism 157 is engaged with the ball screw shaft 159. A pulley 162 is provided at the rear end of the ball screw shaft 159, and a timing belt 164 is provided between the output shaft 63 of the mold clamping motor 158 such as a servo motor and the pulley 162. A position detector 165 that detects the number of rotations or the amount of rotation of the mold clamping motor 158 is connected to the rear end of the output shaft 163 of the mold clamping motor 158.

  In the mold clamping device 150, when the mold clamping motor 158 that is a drive unit is driven, the rotation of the mold clamping motor 158 is transmitted to the ball screw shaft 159 via the timing belt 164. Then, the ball screw shaft 159 and the nut 161 convert the rotational motion into a linear motion, and the toggle mechanism 157 operates. By the operation of the toggle mechanism 157, the movable platen 152 moves along the tie bar 155, and mold closing, mold clamping, and mold opening are performed.

  As shown also in FIG. 1, the injection apparatus 10 is attached to a fixed mold 50 and fills the cavity of the mold with molten resin through the fixed mold. The injection device 10 needs to operate in conjunction with the operation of the mold clamping device 150. In this embodiment, the injection device 10 is controlled by the control unit 170 that controls the operation of the electric injection molding machine including the mold clamping device 150.

  In other words, the control unit 170 that controls the operation of the electric injection molding machine controls the driving of the mold clamping motor 158 that is the driving unit of the mold clamping device 150, and also controls the injection motor 20 of the injection device 10 and the nozzle touch motor 31. Control the drive. Thereby, the injection device 10 is driven in conjunction with the operation of the mold clamping device 50, and molten resin is injected from the injection device 10 into the fixed mold 50 at an appropriate time in the mold clamping process.

  In the above-described embodiment, the case where the injection device is attached to the fixed mold has been described. However, the injection device may be attached to the movable mold. That is, the number of injection devices can be increased by attaching an injection device having a minimum required injection capacity to a fixed mold or a movable mold.

It is a side view of the injection device by a 1st embodiment of the present invention. It is sectional drawing which expands and shows the inside of the housing shown in FIG. It is a side view of the injection device by a 2nd embodiment of the present invention. It is a top view which shows the mold-clamping apparatus part when adding two injection apparatuses by this invention to the rotary type injection molding machine for 2 materials, and comprising the injection molding machine for 4 materials. It is a figure which shows the whole structure of the injection molding machine to which the injection apparatus shown in FIG. 1 was attached.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,10A Injection apparatus 11 Screw cylinder 12 Plunger cylinder 13 Plunger 14 Injection nozzle 16 Front flange 20 Injection motor 24 Ball screw shaft 25 Housing 27 Disc spring 29 Load cell 30 Nut 31 Nozzle touch motor 40 Fixed platen 42 Screw cylinder 44 Injection nozzle 50 Fixed mold 56 Movable mold 57 Core back mechanism 61 Fixed platen 62 Movable platen 63 Rotary mechanism 65 Rotary table 66 Reversing motor 67 Reversing belt 68F, 68R Screw plunger 71F, 71R Fixed mold 72F, 72R Movable mold 110 Frame 120 injection device 150 mold clamping device 157 toggle mechanism 163 mold clamping motor

Claims (6)

An injection molding machine having an injection device integrally attached to a mold,
An injection molding machine, wherein the injection device is an electric injection device. An injection molding machine according to claim 1,
The injection device is
A first cylinder for melting and weighing the resin material;
A second cylinder for injecting molten resin supplied from the first cylinder;
An attachment mechanism for movably supporting the second cylinder with respect to the mold;
An injection molding machine characterized by comprising: An injection molding machine according to claim 2,
The attachment mechanism is configured such that the second cylinder is placed on the outer peripheral surface of the mold such that an injection nozzle at the tip of the second cylinder is opposed to a portion on the outer peripheral surface of the mold that is on the inner side of the mold fitting surface. An injection molding machine configured to be attached. An injection molding machine according to claim 2 or 3,
The mounting mechanism has a support member provided at a position facing the second cylinder and sandwiches the second cylinder, and the second cylinder is supported at both ends by the support member. Molding machine. An injection molding machine according to claim 1,
A fixed platen for mounting the fixed mold of the mold;
An injection molding machine comprising: a third cylinder having a nozzle portion that comes into contact with the fixed mold through a hole provided in the fixed platen. An injection molding machine according to any one of claims 1 to 5,
A movable platen for mounting a movable mold facing the fixed mold of the mold;
A mold clamping drive for moving the movable platen back and forth;
A control unit for transmitting a signal to the mold clamping drive unit,
The control section transmits a signal to the injection apparatus.

Images