JP2014184701A - Injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding machine to which a detection object can be easily mounted.SOLUTION: An injection molding machine 10 includes: a position detection part 61 detecting whether a position of a second member 40 with respect to a first member 11 is a predetermined position; a detection target part 62 which is detected to be present by the position detection part 61 when the position of the second member 40 with respect to the first member 11 is the predetermined position; and a mounting part 19 to which the detection target part 62 or the position detection part 61 is mounted. The detection target part 62 or the position detection part 61 (for example the detection target part 62) which is mounted to the mounting part 19 has an insertion part 63 in which the mounting part 19 is inserted.

Description

  The present invention relates to an injection molding machine.

  Presence detection sensors such as limit switches and proximity switches are used for monitoring the operation of the injection molding machine (see, for example, Patent Document 1).

JP 2012-187769 A

  Conventionally, it has been complicated to attach a detection object to be detected by the presence detection sensor.

  This invention is made | formed in view of the said subject, Comprising: It aims at provision of the injection molding machine which can make attachment of a detection target object easy.

In order to solve the above problems, according to one aspect of the present invention,
A position detector that detects whether or not the position of the second member relative to the first member is a predetermined position;
A detection target part whose presence is detected by the position detection part when the position of the second member with respect to the first member is the predetermined position;
An attachment part to which the detection target part or the position detection part is attached,
Among the detection object part and the position detection part, an attachment machine that has an insertion part for inserting the attachment part is provided.

  According to one aspect of the present invention, an injection molding machine that can facilitate attachment of a detection object is provided.

It is a figure which shows the injection molding machine by one Embodiment of this invention. It is a figure which shows the principal part of the injection molding machine by one Embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In each of the drawings, the same or corresponding components are denoted by the same or corresponding reference numerals, and description thereof will be omitted.

  FIG. 1 is a view showing an injection molding machine according to an embodiment of the present invention. As shown in FIG. 1, the injection molding machine 10 includes a mold clamping device 20, an injection device 40, and a moving device 50.

  The mold clamping device 20 includes, for example, a fixed platen 22, a movable platen 23, a rear platen 24, a tie bar 25, a toggle mechanism 27, and a mold clamping motor 29. In the description of the mold clamping device 20, the movement direction (right direction in FIG. 1) of the movable platen 23 in the mold closing process is assumed to be the front, and the movement direction (left direction in FIG. 1) of the movable platen 23 in the mold opening process is assumed to be the rear. .

  The fixed platen 22 may be fixed to the frame 11. The fixed mold 12 is mounted on the mold mounting surface of the fixed platen 22.

  The movable platen 23 is movable with respect to the frame 11. A plurality of (for example, two) platen guides 17 laid on the frame 11 guide the movement of the movable platen 23. The movable mold 13 is attached to the mold attachment surface of the movable platen 23.

  The rear platen 24 is disposed behind the movable platen 23 and is connected to the fixed platen 22 via a plurality of tie bars 25. The rear platen 24 is movably mounted on the frame 11 in order to allow the tie bar 25 to extend during mold clamping.

  In this embodiment, the fixed platen 22 is fixed to the frame 11 and the rear platen 24 is placed on the frame 11. However, the fixed platen 22 may be placed on the frame 11 and the rear platen 24 may be fixed to the frame 11. .

  The toggle mechanism 27 is disposed between the movable platen 23 and the rear platen 24. The toggle mechanism 27 includes, for example, a cross head 27 a that can move forward and backward with respect to the frame 11 and a plurality of links that transmit a propulsive force input to the cross head 27 a to the movable platen 23.

  The mold clamping motor 29 includes a ball screw mechanism as a motion conversion unit that converts rotational motion into linear motion, and moves the drive shaft 28 forward and backward to advance and retract the crosshead 27 a and operate the toggle mechanism 27. The movable platen 23 is advanced and retracted, and mold closing, mold clamping, and mold opening are performed.

  The injection device 40 fills a cavity space formed between the movable mold 13 and the fixed mold 12 in a clamped state with a liquid molding material (for example, molten resin). The filled molding material is solidified to obtain a molded product.

  The injection device 40 includes a heating cylinder 41, a screw 42, a metering motor 43, an injection motor 44, an injection frame 45, and the like. In the description of the injection device 40, the moving direction of the screw 42 in the filling process (left direction in FIG. 1) is assumed to be the front, and the moving direction of the screw 42 in the weighing process (right direction in FIG. 1) is assumed to be the rear.

  The heating cylinder 41 is heated by a heater or the like, and heats the molding material in the heating cylinder 41. The heating cylinder 41 is supported by the front plate 45 a of the injection frame 45. A hopper 46 serving as a molding material supply unit that supplies a molding material (for example, resin pellets) into the heating cylinder 41 is provided at the rear of the heating cylinder 41.

  The screw 42 is disposed in the heating cylinder 41 so as to be rotatable and advance / retreat. The molding material supplied into the heating cylinder 41 is fed forward along a spiral groove 42 a formed in the screw 42 as the screw 42 rotates.

  The weighing motor 43 rotates the screw 42 in the heating cylinder 41. The rotation of the metering motor 43 is transmitted to the injection shaft 47 via a belt, a pulley or the like. As the injection shaft 47 rotates, the screw 42 is rotated.

  The injection motor 44 advances and retracts the screw 42 in the heating cylinder 41. The rotational motion of the injection motor 44 is converted into a linear motion by the ball screw mechanism 48 and transmitted to the pressure plate 49.

  The pressure plate 49 holds a bearing Br that rotatably supports the injection shaft 47, and can advance and retreat along a guide bar 45c provided between the front plate 45a and the rear plate 45b. The front plate 45a, the rear plate 45b, the guide bar 45c, and the like constitute the injection frame 45.

  The linear motion of the pressure plate 49 with respect to the injection frame 45 is transmitted to the screw 42 via the bearing Br, the injection shaft 47, and the like.

  The moving device 50 moves the injection device 40 with respect to the frame 11. A plurality of (for example, two) injection guides 18 laid on the frame 11 guide the movement of the injection device 40. The moving device 50 is composed of, for example, a hydraulic cylinder.

  In addition, the structure of the moving apparatus 50 may be various, for example, a moving apparatus may be comprised by the combination of the ball screw mechanism which converts the rotational motion of an electric motor and an electric motor into a linear motion.

  Next, the operation of the injection molding machine 10 configured as described above will be described. The operation of the injection molding machine 10 is controlled by a controller composed of a macro computer or the like.

  In the mold closing process, the mold clamping motor 29 is driven to advance the cross head 27a and operate the toggle mechanism 27. The movable platen 23 is moved forward, the movable mold 13 and the fixed mold 12 come into contact with each other, and the mold closing is completed. After the mold closing is completed, the mold clamping process is started.

  In the mold clamping process, a mold clamping force is generated by multiplying the propulsive force of the mold clamping motor 29 by the toggle magnification. A cavity space is formed between the fixed mold 12 and the movable mold 13 in the clamped state. During the mold clamping process, a nozzle touch process, a filling process, a pressure holding process, and a cooling process are performed.

  In the nozzle touch process, the moving device 50 is driven to bring the injection device 40 closer to the fixed mold 12 and press the nozzle 41 a of the heating cylinder 41 against the fixed mold 12. In the filling step and the pressure holding step, leakage of the molding material from between the fixed mold 12 and the nozzle 41a can be prevented.

  In the filling step, the injection motor 44 is driven to advance the screw 42 at a set speed, and the molding material accumulated in front of the screw 42 is filled into the cavity space in the mold apparatus 30. The set speed of the screw 42 may be constant or may be changed according to the screw position or the elapsed time. When the screw 42 moves forward to a predetermined position (so-called V / P switching position), the pressure holding process is started. Note that when the elapsed time from the start of the filling process reaches a predetermined time, the pressure holding process may be started.

  In the pressure holding process, the injection motor 44 is driven to push the screw 42 forward at a set pressure, and the molding material corresponding to the volume shrinkage due to the cooling of the molding material in the cavity space is replenished. The set pressure of the screw 42 may be constant or may be changed according to the elapsed time. After the entrance of the cavity space (so-called gate) is sealed with the solidified molding material and the backflow of the molding material from the cavity space is prevented, the cooling process is started.

  In the cooling step, the molding material in the cavity space is solidified. During the cooling step, a metering step for weighing the molding material for the next molded part may be performed.

  In the metering step, the metering motor 43 is driven to rotate the screw 42, and the molding material supplied into the spiral groove 42a formed in the screw 42 is fed forward. The heating cylinder 41 gradually melts the molding material that advances in the heating cylinder 41. As the melted molding material is fed to the front of the screw 42 and accumulated in the front portion of the heating cylinder 41, the screw 42 is retracted.

  In the measuring step, the injection motor 44 may be driven so as to apply a predetermined back pressure to the screw 42 in order to limit the rapid retreat of the screw 42. When the screw 42 is retracted to a predetermined position and a predetermined amount of molding material is accumulated in front of the screw 42, the driving of the measuring motor 43 and the injection motor 44 is stopped.

  The mold opening process is performed after the cooling process. In the mold opening process, the mold clamping motor 29 is driven, the cross head 27a is retracted, and the toggle mechanism 27 is operated. The movable platen 23 is moved backward with respect to the frame 11, and the mold opening is performed. After the mold opening is completed, the molded product is ejected from the movable mold 13. The nozzle touch force may be released before the mold is opened.

  FIG. 2 is a view showing a main part of an injection molding machine according to an embodiment of the present invention. As shown in FIG. 2, the injection molding machine 10 includes a position detection unit 61 and a detection target unit 62.

  The position detector 61 detects whether or not the position of the injection device 40 with respect to the frame 11 is at a predetermined position (for example, a backward limit position), and outputs the detection result to the controller. The position of the injection device 40 relative to the frame 11 can be monitored.

  The position detection unit 61 is configured by, for example, a non-contact type proximity switch. There are various types of proximity switches, and for example, any of an electromagnetic induction type, a capacitance type, an ultrasonic type, a photoelectric type, and a magnetic type may be used. In addition, the position detection part 61 may be comprised with the contact-type limit switch.

  The position detection unit 61 may move with the injection device 40 with respect to the frame 11. The position detection unit 61 detects the presence of the detection target unit 62 that is fixed to the frame 11 and detects that the position of the injection device 40 with respect to the frame 11 is at a predetermined position.

  The detection target part 62 is attached to an attachment part 19 constituted by, for example, the frame 11 and the injection guide 18. The detection target portion 62 includes an insertion portion 63 for inserting the injection guide 18, an overhang portion 64 protruding from the insertion portion 63, a pressing bolt 65 as a pressing portion held by the insertion portion 63 and pressed against the frame 11, and the insertion portion 63. The contact bolt 66 is held and brought into contact with the injection guide 18. The insertion part 63 and the overhanging part 64 may be formed integrally, for example, by processing a steel plate.

  The insertion portion 63 includes an outer side wall portion 63a disposed outside the pair of injection guides 18, an inner side wall portion 63b disposed inside the pair of injection guides 18, an outer side wall portion 63a, and an inner side wall portion 63b. It is comprised with the connection wall part 63c which connects. A groove for inserting one injection guide 18 is formed between the outer side wall 63a and the inner side wall 63b. The detection target part 62 can clamp the attachment part 19 from both the outer side and the inner side, and the attachment of the detection target part 62 can be facilitated.

  The pressing bolt 65 may be screwed into the bolt hole of the outer side wall 63a and held by the outer side wall 63a. The pressing bolt 65 can be rotated from the outside.

  When the pressing bolt 65 is rotated in the forward direction, the tip end portion of the pressing bolt 65 protrudes from the outer side wall portion 63a and comes into contact with the side surface of the injection guide 18. There is no bolt hole on the side surface of the injection guide 18 to which the pressing bolt 65 is screwed.

  When the pressing bolt 65 is further rotated in the forward direction, the tip of the pressing bolt 65 is pressed against the side surface of the frame 11. At this time, the outer side wall 63a holding the pressing bolt 65 is pressed outward, and the inner side wall 63b is pressed against the side surface of the injection guide 18 from the inner side. Therefore, the insertion part 63 becomes immovable along the injection guide 18, and the position of the injection device 40 with respect to the frame 11 when the position detection part 61 detects the presence of the detection target part 62 is determined.

  When the pressing bolt 65 is rotated in the reverse direction, the pressing bolt 65 is separated from the side surface of the frame 11 and the insertion portion 63 is movable along the injection guide 18. After the insertion portion 63 is moved along the injection guide 18, when the pressing bolt 65 is rotated in the forward direction, the insertion portion 63 becomes immovable along the injection guide 18 again.

  Thus, since the detection target portion 62 has the pressing bolt 65 held by the insertion portion 63 and pressed against the frame 11, the attachment position of the detection target portion 62 in the guide direction of the injection guide 18 (left-right direction in FIG. 1) is arbitrary. The position can be changed.

  Note that the side surface of the frame 11 of the present embodiment does not have a bolt hole for screwing the bolt held by the insertion portion 63, but may be provided. By screwing the bolt held by the insertion portion 63 into a bolt hole formed on the side surface of the frame 11, the insertion portion 63 becomes immovable along the injection guide 18. If a plurality of bolt holes formed on the side surface of the frame 11 are arranged at intervals in the guide direction of the injection guide 18 (left-right direction in FIG. 1), the attachment position of the detection target portion 62 can be roughly adjusted. It is.

  Further, since a part of the insertion portion 63 (for example, the inner side wall portion 63b) is pressed against the side surface of the injection guide 18, the pressing direction position of the detection target portion 62 with respect to the injection guide 18 (the horizontal position in FIG. 2) is the target position. Prone.

  When the position in the pressing direction of the detection target portion 62 with respect to the injection guide 18 can be adjusted, a bolt hole is provided not only in the outer side wall portion 63a but also in the inner side wall portion 63b, and a pressing bolt screwed into the bolt hole is provided. The tip may be pressed against the side surface of the injection guide 18. By rotating the pressing bolts disposed on both the outer and inner sides of the mounting portion 19 and moving them in the same direction, the pressing direction position of the detection target portion 62 relative to the injection guide 18 can be adjusted.

  The contact bolt 66 is screwed into the bolt hole of the connection wall 63c and is held by the connection wall 63c. In FIG. 2, the contact bolt 66 can be rotated from above.

  When the contact bolt 66 is rotated in the forward direction, the tip of the contact bolt 66 descends and comes into contact with the upper surface of the injection guide 18. Thereby, the vertical position of the insertion part 63 with respect to the injection guide 18 is determined, and the vertical position of the insertion part 63 with respect to the position detection part 61 is determined.

  The vertical position of the insertion portion 63 with respect to the position detection portion 61 can be adjusted by the rotation amount and the rotation direction of the contact bolt 66.

  Note that the upper surface of the injection guide 18 of the present embodiment does not have a bolt hole for screwing the bolt held by the insertion portion 63, but it may be present. If a plurality of bolt holes formed on the upper surface of the injection guide 18 are arranged at intervals in the guide direction of the injection guide 18 (left-right direction in FIG. 1), rough adjustment of the mounting position of the detection target portion 62 can be performed. Is possible.

  The overhang portion 64 projects inward from the insertion portion 63. The distance between the position detection unit 61 and the detection target unit 62 arranged away from the insertion unit 63 is short, and the detection accuracy is good. The position detector 61 detects whether or not the position of the injection device 40 with respect to the frame 11 is at a predetermined position by detecting the presence or absence of the overhanging portion 64.

  In this embodiment, one overhanging portion 64 protrudes from one insertion portion 63, but a plurality of overhanging portions may protrude from one insertion portion 63. If the plurality of overhang portions 64 are provided at intervals in the guide direction of the injection guide 18, the number of positions that can be detected by the position detection unit 61 is plural. For the same purpose, a plurality of detection target portions 62 may be provided at intervals in the guide direction of the injection guide 18.

  As mentioned above, although embodiment of the injection molding machine was described, this invention is not limited to the said embodiment, In the range of the summary of this invention described in the claim, various deformation | transformation and substitution are possible. Is possible.

  For example, the mounting portion 19 of the above embodiment is configured by the injection guide 18 and the frame 11, but may be configured by only the injection guide 18. In this case, the tip of the pressing bolt 65 is pressed against the side surface of the injection guide 18, not the side surface of the frame 11.

  In the above embodiment, the position detection unit 61 is attached to the injection device 40 and the detection target unit 62 is attached to the injection guide 18 or the like, but the arrangement of the position detection unit 61 and the detection target unit 62 may be reversed. The position detection unit 61 may be attached to the injection guide 18, and the detection target unit 62 may be attached to the injection device 40. When the position detection unit 61 is attached to the injection guide 18 that is an attachment unit, the position detection unit 61 may include an insertion unit for inserting the injection guide 18, and further includes a pressing unit that is held by the insertion unit and pressed against the injection guide 18. It's okay. Further, when the detection target part 62 is attached to an attachment part formed in the injection device 40, the detection target part 62 may have an insertion part for inserting the attachment part, and a pressing part held by the insertion part and pressed against the attachment part. You may also have.

  Further, the position detection unit 61 of the above embodiment detects the backward limit position of the injection device 40 with respect to the frame 11, but the position detected by the position detection unit 61 may be anywhere within the movement range of the injection device 40. For example, the position detected by the position detector 61 may be a forward limit position or a shift position of the injection device 40 with respect to the frame 11.

  Moreover, although the position detection part 61 of the said embodiment detects the position of the injection apparatus 40 with respect to the flame | frame 11, what is necessary is just to detect the position of the movable member with respect to a fixed member. For example, the position detection unit determines the position of the movable platen 23 relative to the frame 11, the position of the pressure plate 49 relative to the injection frame 45 (that is, the position of the screw 42 relative to the heating cylinder 41), and the position of the movable mold 13 relative to the stationary mold 12. It may be detected.

  The injection molding machine of the above embodiment is a horizontal type that opens and closes in the horizontal direction, but may be a vertical type that opens and closes in the vertical direction.

  The mold clamping device of the above embodiment generates a mold clamping force using a toggle mechanism, but without using the toggle mechanism, the movable platen 23 uses the propulsive force generated by the mold clamping motor as a direct mold clamping force. May be communicated to. The mold clamping device may transmit the propulsive force generated by the fluid pressure cylinder directly to the movable platen as the mold clamping force. Further, the mold clamping device may perform mold opening / closing by a linear motor and mold clamping by an electromagnet.

DESCRIPTION OF SYMBOLS 10 Injection molding machine 11 Frame 12 Fixed mold 13 Movable mold 17 Platen guide 18 Injection guide 19 Mounting part 20 Clamping device 22 Fixed platen 23 Movable platen 40 Injection device 50 Moving device

Claims (3)

A position detector that detects whether or not the position of the second member relative to the first member is a predetermined position;
A detection target part whose presence is detected by the position detection part when the position of the second member with respect to the first member is the predetermined position;
An attachment part to which the detection target part or the position detection part is attached,
Of the detection target part and the position detection part, the part attached to the attachment part has an insertion part for inserting the attachment part.   The injection molding machine according to claim 1, wherein the detection target part and the position detection part that are attached to the attachment part include a pressing part that is held by the insertion part and pressed against the attachment part.   The injection molding machine according to claim 1, wherein the attachment portion includes a guide that guides movement of the second member relative to the first member.

Images