JP2005205790A - Molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase thrust transmitted to a rectlinear movement member. <P>SOLUTION: A molding machine has a movement direction conversion part which is connected to the output shaft of a driving part, receives the rotation of the output shaft, and converts rotational movement into rectlinear movement, a first cylinder part 58 generating pressure with the rectlinear movement of the movement direction conversion part, and a second cylinder part 59 which is installed to communicate with the first cylinder part 58 and moves a pressure-receiving member forward/backward based on the pressure transmitted from the first cylinder part 58. Since the pressure-receiving members of the first and second cylinder parts 58, 59 have different pressure-receiving areas, for example, when the pressure-receiving area of the pressure-receiving member of the second cylinder part is made larger than that of the pressure-receiving member of the first cylinder part, the thrust transmitted to the rectlinear movement member can be increased. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a molding machine.

  Conventionally, in a molding machine, for example, an injection molding machine, a screw is advanced in a heating cylinder, a molten resin is injected at a high pressure, and formed between a fixed mold and a movable mold of a mold apparatus. A molded product is obtained by filling the cavity space and cooling and solidifying the resin in the cavity space.

  For this purpose, a mold clamping device is provided, and the mold clamping device includes a fixed platen to which a fixed mold is attached, a movable platen to which a movable mold is attached, and a toggle mechanism for moving the movable platen back and forth. The mold device can be closed, clamped and opened by operating the toggle mechanism and moving the movable platen back and forth.

By the way, in the case of an electric injection molding machine, an injection motor is provided for moving the screw forward and backward in the heating cylinder, and a mold clamping motor is provided for operating the toggle mechanism. Then, the rotational rotation generated by the injection motor and the mold clamping motor is converted into a linear motion by a ball screw, and a predetermined thrust is transmitted to the linearly moving member such as the screw and the movable platen. The moving member can be advanced and retracted (for example, refer to Patent Document 1).
JP 2003-211512 A

  However, in the conventional electric injection molding machine, the thrust is determined by the capacities of the injection motor and the mold clamping motor. Therefore, when obtaining a large thrust, not only the capacities of the injection motor and the mold clamping motor are used. It is necessary to increase the capacity of the ball screw. However, if the capacities of the injection motor, mold clamping motor, and ball screw are increased, the cost increases.

  An object of the present invention is to solve the problems of the conventional electric injection molding machine and to provide a molding machine capable of increasing the thrust transmitted to the linearly moving member.

  For this purpose, in the molding machine of the present invention, a motion direction conversion unit that is connected to the output shaft of the drive unit and receives rotation of the output shaft to convert rotational motion into linear motion, and linear motion of the motion direction conversion unit A first cylinder portion that generates pressure, and a second cylinder portion that is disposed in communication with the first cylinder portion and that causes the pressure receiving member to advance and retreat based on the pressure transmitted from the first cylinder portion. And a cylinder portion.

  The pressure receiving members of the first and second cylinder parts have different pressure receiving areas.

  In another molding machine of the present invention, the movement direction conversion section is further provided with a first conversion element whose rotation is restricted and a reciprocating movement, and is screwed together with the first conversion element. And a second conversion element connected to the output shaft.

  The pressure receiving member of the first cylinder portion is attached to the second conversion element.

  In still another molding machine of the present invention, the movement direction conversion section is further provided with two first conversion elements whose rotations are restricted, and a reciprocating movement, and the first conversion elements and the screws. And two second conversion elements coupled to the output shaft.

  The pressure receiving member of the first cylinder portion is attached to each second conversion element and connected by a connecting member.

  In still another molding machine of the present invention, the movement direction conversion section is disposed so as to be freely movable back and forth, and is screwed into the first conversion element, the rotation of which is restricted, and the first conversion element. And a second conversion element connected to the output shaft.

  The pressure receiving member of the first cylinder portion is a predetermined part of the first conversion element.

  In still another molding machine of the present invention, the movement direction conversion portion is further arranged to be capable of moving forward and backward, the two first conversion elements whose rotation is restricted, and the first conversion elements and the screws. And two second conversion elements connected to the output shaft and integrally connected to each other.

  The pressure receiving member of the first cylinder portion is a predetermined part of each first conversion element.

  In still another molding machine according to the present invention, the first cylinder portion is further filled with a lubricant for lubricating the motion direction conversion portion. The pressure of the first cylinder part is transmitted to the second cylinder part by the lubricant.

  In still another molding machine of the present invention, the molding machine further includes a pressure detection unit that detects the pressure in the second cylinder unit.

  Then, the drive unit is driven based on the pressure detected by the pressure detection unit.

  According to the present invention, in the molding machine, a motion direction conversion unit that is coupled to the output shaft of the drive unit and receives rotation of the output shaft to convert rotational motion into linear motion, and linear motion of the motion direction conversion unit A first cylinder portion that generates pressure, and a second cylinder portion that is disposed in communication with the first cylinder portion and that causes the pressure receiving member to advance and retreat based on the pressure transmitted from the first cylinder portion. And a cylinder portion.

  The pressure receiving members of the first and second cylinder parts have different pressure receiving areas.

  In this case, the rotation generated by driving the drive unit is transmitted to the movement direction conversion unit, and the movement direction conversion unit converts the rotation motion into a straight movement. Then, in the first cylinder portion, a pressure is generated with the linear movement, and the pressure receiving member of the second cylinder portion is moved forward and backward based on the pressure.

  Since the pressure receiving members of the first and second cylinder parts have different pressure receiving areas, for example, the pressure receiving area of the pressure receiving member of the second cylinder part is larger than the pressure receiving area of the pressure receiving member of the first cylinder part. Then, the thrust transmitted to the rectilinearly moving member can be increased.

  Therefore, the capacity of the drive unit can be reduced accordingly, and the responsiveness of the rectilinearly moving member can be improved.

  Further, when the pressure receiving area of the pressure receiving member of the first cylinder part is larger than the pressure receiving area of the pressure receiving member of the second cylinder part, the responsiveness of the rectilinearly moving member can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this case, a molding machine, for example, an injection molding machine will be described.

  FIG. 1 is a conceptual diagram showing a main part of an injection apparatus according to a first embodiment of the present invention, and FIG. 2 is a conceptual diagram of an injection molding machine according to the first embodiment of the present invention.

  In the figure, 11 is an injection apparatus, 12 is a mold apparatus, 13 is a mold clamping apparatus for closing, clamping and opening the mold apparatus 12, and 14 is the injection apparatus 11, mold apparatus 12 and mold clamping. A molding machine frame that supports the apparatus 13, and 14a is an injection apparatus frame that supports the injection apparatus 11. The mold apparatus 12 is a fixed mold 17 serving as a first mold and a movable mold serving as a second mold. A mold 18 is provided.

  The injection device 11 is a heating cylinder 15 as an injection member, and as a first linearly moving member that is freely movable forward and backward (moves in the left-right direction in the figure) and is rotatable in the heating cylinder 15. A screw 16, a metering motor 21 as a metering drive unit for rotating the screw 16, an injection motor 22 as an injection drive unit for moving the screw 16 forward and backward, and the injection motor 22 The ball screw unit 23 as a motion direction conversion unit that converts the rotational motion generated by driving the motor into a linear motion with rotation, that is, a rotational direction motion, and amplifies the thrust of the rotational motion A cylinder unit 24 or the like as an amplifying unit to be enlarged is included. The ball screw unit 23 and the cylinder unit 24 constitute a first thrust amplifying device 25 that changes the direction of motion and amplifies the thrust.

  An injection nozzle 26 is disposed at the front end (left end in FIG. 2) of the heating cylinder 15, a cover 27 is disposed around the heating cylinder 15, and a hopper 28 is disposed near the rear end (right end in FIG. 2) of the heating cylinder 15. The The injection motor 22 includes a housing body 41, an output shaft 43 rotatably disposed by bearings b1 and b2 with respect to the housing 41, a rotor 44 attached to the output shaft 43, And a stator 45 attached to the casing 41 on the outer side in the radial direction of the rotor 44. The casing 41 is disposed at the cylindrical body 46, an annular end plate 47 disposed at the rear end (left end in the figure) of the cylindrical body 46, and the front end (right end in the figure) of the cylindrical body 46. An annular end plate 48 is provided.

  The ball screw unit 23 is disposed with the flange portion f1 attached to the end plate 48, and a ball nut 51 as a first conversion element whose rotation is restricted, and a second conversion element that is rotatably disposed. The ball screw shaft unit 52 includes a screw portion 54 to be screwed with the ball nut 51, and a rear side (left side in the drawing) of the screw portion 54. A spline portion 55 that is spline engaged with the output shaft 43 in the output shaft 43 is provided. The output shaft 43 and the spline portion 55 constitute a first rotation transmission portion, and the ball screw shaft unit 52 is connected to the output shaft 43 via the spline portion 55, and the rotation of the output shaft 43 is transmitted. In the present embodiment, the ball screw unit 23 is used as the motion direction conversion unit, but a roller screw unit may be used instead of the ball screw unit 23. In this case, a screw including a roller nut as a first conversion element and a roller screw shaft unit as a second conversion element rotatably arranged, and a screw screwed into the roller screw shaft unit with the roller nut. Part is formed.

  The cylinder unit 24 includes a first cylinder portion 58 disposed adjacent to the injection motor 22, a second cylinder portion 59 disposed adjacent to the injection device frame 14a, and a first cylinder portion 58. , Communication pipes 61 and 62 for communicating the second cylinder portions 58 and 59, and a reservoir tank 63 disposed in the communication pipe 62.

  The first cylinder portion 58 has a circular shape, and a cylinder 66 disposed adjacent to the casing 41, and can be moved forward and backward in the cylinder 66, and is rotatable. A piston 67 is provided as a first pressure receiving member disposed so as to be slidable with respect to the inner peripheral surface of 66, and the first in front of the piston 67 (rightward in the drawing) in the cylinder 66. The oil chamber 68 surrounds a part of the ball nut 51 and the ball screw shaft unit 52 behind the piston 67 to form a second oil chamber 69. Then, the screw portion 54 is disposed in the second oil chamber 69 filled with oil as a pressure transmission medium, and the screw portion 54 is immersed in the oil so that the oil is ball screwed. The shaft unit 52 is made to function as lubricating oil. Further, the second oil chamber 69 and the spline portion 55 are communicated with each other so that the oil can function as a lubricating oil for the spline portion 55. The piston 67 is attached to the front end of the ball screw shaft unit 52 and has a circular shape.

  A seal member SL1 is disposed on the outer peripheral surface of the piston 67, and the space between the inner peripheral surface of the cylinder 66 and the outer peripheral surface of the piston 67 is sealed by the seal member SL1. The second cylinder portion 59 is disposed at the rear end of the injection device frame 14a, and includes a cylinder 71 constituting a drive portion frame, and can be moved forward and backward in the cylinder 71, and an inner peripheral surface of the cylinder 71. And a piston 72 as a second pressure receiving member slidably disposed with respect to the first oil chamber 73 in front of the sliding portion of the piston 72 in the cylinder 71. A second oil chamber 74 is formed further rearward. The first oil chamber 68 and the second oil chamber 74 are communicated by the communication pipe 61, and the second oil chamber 69 and the first oil chamber 73 are communicated by the communication pipe 62. The second oil chamber 74 is provided with a pressure sensor Sp as a pressure detection unit. The pressure sensor Sp detects the pressure received by the piston 72 and sends it to a control unit (not shown). The pressure control processing means of the control unit performs pressure control processing and drives the injection motor 22 according to the pressure detected by the pressure sensor Sp.

  A support member 75 is attached to the rear end of the screw 16, and the support member 75 is rotatably supported with respect to the piston 72. The output shaft 76 of the metering motor 21 is disposed so as to protrude forward, and is splined with the support member 75 at a spline portion formed at the front end. The support member 75 and the output shaft 76 constitute a second rotation transmission unit. A position detection device 78 that detects the position of the piston 72 based on the position of the screw 16 is disposed between the cylinder 71 and the piston 72.

  A cylindrical portion 81 is formed to project forward from an end plate 79 disposed at the rear end of the cylinder 71, and a front end portion (left end portion in the drawing) of the cylindrical portion 81 slides in the piston 72. The output shaft 76 extends forward in the cylindrical portion 81 in a state of being sealed from the second oil chamber 74.

  On the other hand, the mold clamping device 13 is a fixed platen 82 as a first fixed support member disposed adjacent to and opposite to the injection device 11 on the molding machine frame 14, and the fixed platen 82 and a predetermined platen 82. In the present embodiment, there are a plurality of base plates 83 arranged as a second fixed support member arranged at a distance of 4 mm, and a plurality of (four in FIG. 2) installed between the fixed platen 82 and the base plate 83. Only two of them are shown in FIG. 2) as a movable support member disposed so as to be able to advance and retreat along the tie bar 84 and to face the fixed platen 82. By driving a movable platen 85 as a linearly moving member, a mold clamping motor 91 as a mold clamping drive unit for moving the movable platen 85 forward and backward, and driving the mold clamping motor 91. A ball screw unit 93 as a motion direction conversion unit that converts the rotational motion generated in this way into a rotational linear motion, a cylinder unit 94 as an amplification unit that amplifies and enlarges the thrust of the rotational linear motion, and the like. . The ball screw unit 93 and the cylinder unit 94 constitute a second thrust amplifying device 95 that changes the direction of motion and amplifies the thrust. Since the mold clamping motor 91 has the same structure as the injection motor 22 and the ball screw unit 93 has the same structure as the ball screw unit 23, description thereof will be omitted.

  The cylinder unit 94 is integrated with the first cylinder portion 98 and the base plate 83 disposed adjacent to the mold clamping motor 91 and behind the base plate 83 (leftward in FIG. 2). A second cylinder part 99 formed by projecting toward it, communication pipes 101, 102 for communicating the first and second cylinder parts 98, 99, and a reservoir tank (not shown) disposed in the communication pipe 102 Is provided. The communication pipe 101 includes a main communication pipe 104 disposed on the first cylinder section 98 side, a connection section 105, and first and second branch communication pipes 106 disposed on the second cylinder section 99 side. 107 are provided.

  The first cylinder portion 98 serves as a first pressure receiving member that is disposed in the cylinder 116 so as to be movable forward and backward and rotatable in the cylinder 116 and slidable with respect to the inner peripheral surface of the cylinder 116. In the cylinder 116, a first oil chamber 118 is formed in front of the piston 117 (leftward in FIG. 2), and a second oil chamber 119 is formed in the rear of the piston 117 (rightward in FIG. 2). The The second cylinder 99 is a piston serving as a second pressure receiving member that is disposed in the cylinder 121 and is slidable with respect to the inner peripheral surface of the cylinder 121. 122, a first oil chamber 123 is formed in the cylinder 121 in front of the sliding portion of the piston 122, and a second oil chamber 124 is formed in the rear of the sliding portion of the piston 122. A booster 131 is provided that protrudes from the rear end (left end in FIG. 2) of the cylinder 121 toward the front (right side in FIG. 2) and extends through the first oil chamber 124, A third oil chamber 132 for accommodating the booster 131 is formed in the piston 122.

  In addition, the first oil chamber 118 and the second oil chamber 124, and the second oil chamber 124 and the third oil chamber 132 are connected to the second oil chamber 119 and the second oil chamber 132 by the communication pipe 101. One oil chamber 123 is communicated with the communication pipe 102.

  Between the base plate 83 and the movable platen 85, a position detection device 178 for detecting the position of the movable mold 18 based on the position of the movable platen 85 is disposed.

  In the injection molding machine having the above-described configuration, when the weighing processing unit of the control unit performs the weighing process and the weighing motor 21 is driven in the weighing process, the rotation generated in the output shaft 76 is supported by the support member 75. Is further transmitted to the screw 16, and the screw 16 is rotated. Along with this, the resin as the molding material in the hopper 28 is supplied into the heating cylinder 15, moves forward along a groove formed in the screw 16, and accumulates in front of the screw head at the front end of the screw 16. (T) At this time, the screw 16 is retracted (moved to the right in FIG. 2) by the pressure of the resin accumulated in front of the screw head, and the pressure sensor Sp disposed in the second oil chamber 74 on the pressure receiving side. The injection motor 22 is driven in accordance with the pressure detected by the above, and the back pressure is controlled.

  During this time, in the mold clamping device 13, the mold clamping motor 91 is driven, and the movable platen 85 is moved forward (moved rightward in FIG. 2) to perform mold closing and clamping, A cavity space (not shown) is formed between the movable mold 18.

  Subsequently, in the injection process, when the injection processing means of the control unit performs the injection process and the injection motor 22 is driven, the rotation of the output shaft 43 is rotated via the first rotation transmission unit. The ball screw shaft unit 52 is rotated by being transmitted to the unit 52. In this case, since the ball nut 51 is fixed to the housing 41 and the rotation is restricted, the ball screw shaft unit 52 is advanced and the piston 67 is rotated as the ball screw shaft unit 52 rotates. It is made to move forward with thrust F1. Since the first and second oil chambers 68 and 74 are communicated with each other through the communication pipe 61, the oil is discharged from the first oil chamber 68 as the piston 67 is advanced, and the communication is established. It is sent to the second oil chamber 74 through the pipe 61. At this time, the oil functions as a motion transmission medium and a pressure transmission medium, and the pressure generated in the first oil chamber 68 is transmitted to the second oil chamber 74 via the communication pipe 61, The piston 72 is advanced by the thrust F2. Therefore, the support member 75 and the screw 16 can be advanced, and the resin stored in front of the screw head can be filled into the cavity space of the mold apparatus 12 from the injection nozzle 26. The resin filled in the cavity space is cooled and solidified to form a molded product.

By the way, the pressure receiving area at the front end of the piston 67 in the first cylinder part 58 is A1, and the pressure receiving area radially outward from the cylindrical part 81 at the rear end of the piston 72 in the second cylinder part 59 is A2. Then, the ratio γ1 of the pressure receiving area A2 to the pressure receiving area A1 takes a predetermined value greater than 1. Therefore, the thrust F2 is amplified and becomes larger than the thrust F1,
F2 = γ1 · F1
become.

  As a result, the screw 16 is advanced by the thrust F2 and injection is performed. In addition, as the piston 67 is advanced, the oil discharged from the first oil chamber 68 is supplied to the second oil chamber 74 through the communication pipe 61. As described above, Since the ratio γ1 of the pressure receiving area A2 to the pressure receiving area A1 is larger than 1, the speed at which the piston 72 advances is lower than the speed at which the piston 67 advances. Further, as the piston 72 moves forward, the oil discharged from the first oil chamber 73 is supplied to the second oil chamber 69 via the communication pipe 62, but the first oil chamber 73 is supplied. The pistons 67 and 72 cannot be moved smoothly unless the amount of oil discharged from the oil is equal to the amount of oil supplied to the second oil chamber 69. Therefore, a reservoir tank 63 is provided in the communication pipe 62, and the amount of oil discharged from the first oil chamber 73 by the reservoir tank 63 and the amount of oil supplied to the second oil chamber 69 are as follows. The difference is absorbed.

  By the way, when performing mold closing and clamping in the mold clamping device 13, when the mold opening / closing processing means of the control unit performs mold opening / closing processing and drives the mold clamping motor 91, the output of the mold clamping motor 91 is output. The rotation of the shaft is transmitted to the ball screw shaft unit as the second conversion element of the ball screw unit 93 via the second rotation transmission unit, and the ball screw shaft unit is rotated. Then, with the rotation of the ball screw shaft unit, the piston 117 is moved forward (moved leftward in FIG. 2). Further, since the first to third oil chambers 118, 124, 132 are communicated with each other via the communication pipes 101, 102, the piston 122 is advanced as the piston 117 is advanced. In this way, when the mold is closed and the movable mold 18 comes into contact with the fixed mold 17, the pistons 117 and 122 are stopped.

  Subsequently, the mold opening / closing processing means further drives the mold clamping motor 91 for a predetermined time, and urges the piston 117 forward by the thrust F11. Along with this, the piston 117 biases the piston 122 with the thrust F12. Therefore, in the mold clamping device 13, the mold can be clamped by pressing the movable mold 18 against the fixed mold 17 with a mold clamping force equal to the thrust F 12. The cavity space is formed as the mold is clamped.

By the way, the pressure receiving area at the front end of the piston 117 in the first cylinder part 98 is A11, and the pressure receiving area radially outward from the booster 131 at the rear end (left end in FIG. 2) of the piston 122 in the second cylinder part 99. When the area is A12, the ratio γ11 of the pressure receiving area A12 to the pressure receiving area A11 takes a predetermined value greater than 1. Therefore, the thrust F12 is amplified and becomes larger than the thrust F11,
F12 = γ11 · F11
become.

  Here, in the mold clamping device 13, the connecting portion 105 connects the main communication pipe 104 and the second branch communication pipe 107 when the mold is closed, and connects the first oil chamber 118 and the third oil chamber 132. Let Therefore, the movable platen 85 is advanced by supplying a small amount of oil to the third oil chamber 132. At this time, the second oil chamber 124 is supplied with an amount of oil necessary for the piston 122 to move forward from a reservoir tank (not shown). Subsequently, when the mold is clamped, the connecting portion 105 is switched to connect the main communication pipe 104 and the first branch communication pipe 106 so that the first oil chamber 118 and the second oil chamber 124 are communicated. Therefore, the piston 122 having the pressure receiving area A12 larger than the pressure receiving area A11 receives the oil pressure and generates a clamping force.

  Further, as the piston 122 moves forward, the oil discharged from the first oil chamber 118 is supplied to the second oil chamber 119 via the communication pipe 102, but the first oil chamber 118 is supplied. If the amount of oil discharged from the oil and the amount of oil supplied to the second oil chamber 119 are not equal, the pistons 117 and 122 cannot be moved smoothly. Therefore, the reservoir tank is provided in the communication pipe 102, and the difference between the amount of oil discharged from the first oil chamber 118 by the reservoir tank and the amount of oil supplied to the second oil chamber 119 is provided. To absorb.

  In performing mold opening in the mold clamping device 13, when the mold opening / closing processing means drives the mold clamping motor 91 in the reverse direction, the ball screw shaft unit is rotated in the reverse direction. As the ball screw shaft unit rotates in the reverse direction, the piston 117 is retracted (moved to the right in FIG. 2). Since the first to third oil chambers 118, 124, 132 are communicated with each other through the communication pipes 101, 102, the piston 122 is retracted as the piston 117 is retracted. Since the mold opening is performed in this manner, the molded product can be taken out from the cavity space.

  Thus, in this embodiment, the thrusts F1 and F11 generated in the ball screw units 23 and 93 are amplified by the cylinder units 24 and 94, and the large thrusts F2 and F12 are transmitted to the screw 16 and the movable platen 85. can do.

  Accordingly, the capacities of the injection motor 22, the mold clamping motor 91, and the ball screw units 23 and 93 can be reduced accordingly, so that the cost of the injection molding machine can be reduced.

  Furthermore, in the ball screw unit 23, at least a part of the ball nut 51 and the ball screw shaft unit 52 are accommodated in the second oil chamber 69. Similarly, in the ball screw unit 93, a ball nut as a first conversion element is used. In addition, since at least a part of the ball screw shaft unit is accommodated in the second oil chamber 119 and lubricated by the oil, it is not necessary to use another lubricant such as grease. Therefore, the maintenance and manageability of the injection molding machine can be improved.

  In the ball screw unit 23, the reaction force of the thrust generated in the ball screw shaft unit 52 is transmitted to the ball nut 51. Since the ball nut 51 is fixed to the housing 41, the bearings b1 and b2 are attached. There is no need to use a thrust bearing. Similarly, in the ball screw unit 93, the reaction force of the thrust generated in the ball screw shaft unit is transmitted to the ball nut. Since the ball nut is fixed to the housing, it is necessary to configure the bearing with a thrust bearing. There is no. Therefore, the cost of the first and second thrust amplifying devices 25 and 95 can be reduced.

  Further, the injection motor 22, the mold clamping motor 91, the first and second thrust amplifying devices 25 and 95, and the apparatus main body such as the injection device 11 and the mold clamping device 13 are connected to the connecting pipes 61, 62, 104, 106, 107, the injection motor 22, the mold clamping motor 91, the first and second thrust amplifying devices 25, 95, and the like can be arranged at any place of the injection molding machine. it can.

  Next, a second embodiment of the present invention will be described. In addition, about the thing which has the same structure as 1st Embodiment, the description is abbreviate | omitted by providing the same code | symbol, and the effect of the same embodiment is used about the effect of the invention by having the same structure. .

  FIG. 3 is a conceptual diagram showing the main part of the injection apparatus according to the second embodiment of the present invention.

  In this case, in the injection motor 22 as the injection drive unit, the output shaft 43 is rotatably arranged with respect to the housing 41 by the bearings b11 and b2. The ball screw unit 23 as the movement direction conversion unit is disposed so as to be able to advance and retreat with the flange portion f11 in the direction opposite to the injection motor 22, and the ball as the first conversion element whose rotation is restricted. The nut 51 and a second end fixed to the front end (right end in the figure) of the output shaft 43 are connected to the output shaft 43, are rotatably arranged together with the output shaft 43, and are screwed into the ball nut 51. The ball screw shaft 152 is provided as a conversion element. When the ball screw shaft 152 is rotated in the ball screw unit 23, the rotational motion of the ball screw shaft 152 is converted into a linear motion, and the ball nut 51 is moved forward and backward. The ball screw unit 23 and the cylinder unit 24 as an amplifying unit constitute a first thrust amplifying device 25.

  The cylinder unit 24 includes a first cylinder portion 58 disposed adjacent to the injection motor 22 and a second cylinder portion disposed adjacent to the injection device frame 14a (FIG. 2). 59, first and second cylinder portions 58 and 59, communication pipes 61 and 62 for communicating with each other, and a reservoir tank 63 disposed in the communication pipe 62.

  The first cylinder portion 58 includes a cylinder 66 disposed adjacent to the housing 41, and can move forward and backward (moves in the left-right direction in the drawing) in the cylinder 66, and on the inner peripheral surface of the cylinder 66. A predetermined portion of the ball nut 51 that is slidably disposed on the ball nut 51 and functions as a first pressure receiving member, in the present embodiment, includes a flange portion f11 and is forward of the flange portion f11 in the cylinder 66 (see FIG. The first oil chamber 68 is formed on the right side in FIG. 5 and the second oil chamber 69 is formed on the rear side (left side in the drawing) of the flange portion f11 so as to surround a part of the ball nut 51 and the ball screw shaft 152. The A seal member SL11 is disposed on the outer peripheral surface of the flange portion f11, and the seal member SL11 seals between the inner peripheral surface of the cylinder 66 and the outer peripheral surface of the flange portion f11. In addition, a plurality of guide bars 171 as two guide members in this embodiment are installed at predetermined positions in the cylinder 66, and the ball nut 51 rotates along the guide bars 171. Can be moved back and forth in a restricted state. A seal member SL12 is disposed at a portion where the ball screw shaft 152 penetrates the end plate 48 so that oil in the second oil chamber 69 does not enter the housing 41, and the seal member The space between the inner peripheral surface of the hole of the end plate 48 and the outer peripheral surface of the ball screw shaft 152 is sealed by SL12.

  Further, a seal member (not shown) is disposed between the flange portion f11 and the ball screw shaft 152, and the screwed portion between the ball nut 51 and the ball screw shaft 152 is sealed by the seal member.

  In the injection apparatus configured as described above, when the injection processing means of the control unit drives the injection motor 22 in the injection process, the rotation of the output shaft 43 is transmitted to the ball screw shaft 152, and the ball screw shaft 152 is rotated. . In this case, since the rotation of the ball nut 51 is regulated by the guide bar 171, the ball nut 51 is moved forward (moved rightward in the drawing) by the thrust F 1 as the ball screw shaft 152 rotates. And since the said 1st, 2nd oil chambers 68 and 74 are connected via the communication pipe 61, oil is discharged | emitted from the 1st oil chamber 68 as the ball nut 51 is advanced, The oil is sent to the second oil chamber 74 through the communication pipe 61. At this time, the pressure generated in the first oil chamber 68 is transmitted to the second oil chamber 74 via the communication pipe 61, and the piston 72 as the second pressure receiving member is advanced by the thrust F2.

  In this case, the reaction force of the thrust generated in the ball nut 51 is transmitted to the output shaft 43 via the ball screw shaft 152. Therefore, it is preferable that the bearing b11 is composed of a thrust bearing.

  In the present embodiment, the first thrust amplifying device 25 that converts the direction of rotation and amplifies the thrust when the injection motor 22 is driven has been described. The amplifying device 25 can also be used as a second thrust amplifying device that converts the rotational movement direction and amplifies the thrust when the mold clamping motor 91 is driven.

  Next, a third embodiment of the present invention will be described. In addition, about the thing which has the same structure as 1st Embodiment, the description is abbreviate | omitted by providing the same code | symbol, and the effect of the same embodiment is used about the effect of the invention by having the same structure. .

  FIG. 4 is a conceptual diagram showing the main part of the injection apparatus according to the third embodiment of the present invention.

  In this case, the first thrust amplifying device 25 converts the rotational movement generated by driving the injection motor 22 as the injection drive section into a rotation direction conversion section that converts the rotational movement into a rotation linear movement. 1 ball screw unit 223, a second ball screw unit 233 serving as a motion direction converting unit that converts rotational motion received from the first ball screw unit 223 into rotational linear motion, and a cylinder unit serving as an amplifying unit 24.

  The first ball screw unit 223 includes a ball nut 51 as a first conversion element disposed with the flange portion f1 attached to the end plate 48, and a second conversion element disposed rotatably. A ball screw shaft unit 252 is provided, and the ball screw shaft unit 252 is disposed behind the screw portion 54 (to the left in the drawing) to be screwed with the ball nut 51, and is an injection motor. 22 is provided with a spline portion 55 that is spline-engaged with the output shaft 43. The output shaft 43 and the spline part 55 constitute a first rotation transmission part.

  The second ball screw unit 233 includes a ball nut 201 as a first conversion element disposed with the flange portion f22 attached to the cylinder 66, and is screwed into the ball nut 201 and disposed rotatably. The ball screw shaft 202 as the second conversion element is provided, and the screw direction of the ball screw shaft 202 is reversed to the screw direction of the screw portion 54.

  The cylinder unit 24 includes a first cylinder portion 58 disposed adjacent to the injection motor 22 and a second cylinder portion disposed adjacent to the injection device frame 14a (FIG. 2). 59, first and second cylinder portions 58 and 59, and communication pipes 61 and 62 for communicating with each other, and a reservoir tank 63 disposed in the communication pipe 62.

  The first cylinder portion 58 includes the cylinder 66 disposed adjacent to the housing 41, and can freely move forward and backward (moves in the left-right direction in the drawing), and is rotatable in the cylinder 66. Pistons 267 and 277 are arranged as slidable with respect to the inner peripheral surface and connected to the output shaft 43, and the pistons 267 and 277 have a circular shape. The first oil chamber 268 is mounted between the pistons 267 and 277 in the cylinder 66 and is opposed to the front end (right end in the drawing) of the screw portion 54 and the rear end (left end in the drawing) of the ball screw shaft 202, respectively. Encloses a part of the ball nut 251 and the ball screw shaft unit 252 behind the piston 267 and forward (rightward in the figure) from the piston 277. The second oil chamber 269,279 is formed by surrounding a portion of the ball nut 201 and the ball screw shaft 202.

  Seal members SL21 and SL22 are disposed on the outer peripheral surfaces of the pistons 267 and 277, and the seal members SL21 and SL22 provide a space between the inner peripheral surface of the cylinder 66 and the outer peripheral surfaces of the pistons 267 and 277. Sealed. In the present embodiment, the communication pipe 62 is formed in communication with the first oil chamber 73, the second oil chambers 269, 279 and the reservoir tank 63.

  The rotation of the piston 267 is transmitted to the piston 277 and the pistons 267 and 277 are moved forward and backward relative to predetermined locations of the pistons 267 and 277, in the present embodiment, at two locations in the circumferential direction. Two rotation transmission bars 271 as connecting members are arranged so that they can be made. One end of the rotation transmission bar 271 is fixed to the piston 267, and the other end is slidably extended through a through hole 205 formed in the piston 277. For this purpose, a cylindrical bush 206 as a sliding member is disposed in the through hole 205. In this way, the ball screw shaft unit 252 is coupled to the output shaft 43 via the spline portion 55, and the ball screw shaft 202 is connected via the piston 277, the rotation transmission bar 271, the piston 267, and the ball screw shaft unit 252. It is connected to the output shaft 43 and the rotation of the output shaft 43 is transmitted.

  Note that one end of the rotation transmission bar 271 can be fixed to the piston 277 and the other end can be slidably extended through a through hole formed in the piston 267.

  In this case, in the injection process, when the injection processing means of the control unit drives the injection motor 22, the rotation of the output shaft 43 is transmitted to the ball screw shaft unit 252 via the first rotation transmission unit, and the ball screw shaft The unit 252 and the piston 267 are rotated, and the rotation of the piston 267 is transmitted to the piston 277 via the rotation transmission bar 271 and the ball screw shaft 202 is rotated. The ball nut 251 is fixed to the housing 41, and the ball nut 201 is fixed to the cylinder 66. The rotation of each of the ball nut 251 and the ball screw shaft 202 and the screw portion 54 is opposite to each other. Therefore, as the ball screw shaft unit 252 rotates, the ball screw shaft unit 252 is advanced, and the piston 267 is rotated and moved forward (moved rightward in the drawing) by the thrust F21. As the shaft 202 rotates, the ball screw shaft 202 is retracted (moved leftward in the figure), and the piston 277 is rotated by the thrust F22 while being rotated.

  Therefore, the amount of oil discharged from the first oil chamber 268 per rotation of the injection motor 22 can be increased, and the responsiveness of the screw 16 as the first linearly moving member can be increased. . Further, the strokes of the ball screw shaft unit 252 and the ball screw shaft 202 can be reduced.

  Next, a fourth embodiment of the present invention will be described. In addition, about the thing which has the same structure as 3rd Embodiment, the description is abbreviate | omitted by providing the same code | symbol, and the effect of the embodiment is used about the effect of the invention by having the same structure. .

  FIG. 5 is a conceptual diagram showing a main part of an injection apparatus according to the fourth embodiment of the present invention.

  In this case, when compared with the third embodiment, the capacity of the injection motor 22 as the drive unit for injection is made equal, the diameters of the pistons 267 and 277 as the first pressure receiving members are reduced, and the screw The lead is enlarged, and the strokes of the ball screw shaft unit 252 and the ball screw shaft 202 as the second conversion element per one rotation of the injection motor 22 are increased.

That is, when the pressure receiving area of the pistons 267 and 277 in the third embodiment is A31 and the pressure receiving area of the pistons 267 and 277 in the present embodiment is A41, the ratio ρ of the pressure receiving area A41 to the pressure receiving area A31 is:
ρ = A41 / A31 <1
To be. When the stroke of the ball screw shaft unit 252 and the ball screw shaft 202 per rotation of the injection motor 22 in the third embodiment is ST1, and the stroke in the present embodiment is ST2, the stroke with respect to the stroke ST1 The ratio ε of ST2 is
ε = 1 / ρ
To be.

  Therefore, in the present embodiment, the amount of oil discharged from the first oil chamber 268 per rotation of the injection motor 22 is equal to that in the third embodiment, and the first straight movement member The responsiveness of the screw 16 (FIG. 2) can be made sufficiently high.

  In addition, since the dimensions of the pistons 267 and 277 can be reduced, the capacities of the first and second ball screw units 223 and 233 as the movement direction conversion unit can be reduced accordingly, and the first thrust amplification can be achieved. The cost of the device 25 can be reduced.

  Next, a fifth embodiment of the present invention will be described. In addition, about the thing which has the same structure as 2nd Embodiment, the description is abbreviate | omitted by providing the same code | symbol, and the effect of the embodiment is used about the effect of the invention by having the same structure. .

  FIG. 6 is a conceptual diagram showing a main part of an injection apparatus according to the fifth embodiment of the present invention.

  In this case, in the injection motor 22 as an injection drive unit, the output shaft 43 is rotatably arranged with respect to the housing 41 by the bearings b1 and b2. A cylinder 66 is disposed adjacent to the housing 41, and a ball screw unit 23 serving as a movement direction conversion unit is disposed in the cylinder 66. The ball screw unit 23 includes a ball nut 351 as a first conversion element, a flange f31 disposed in a direction opposite to the injection motor 22 and disposed so as to freely advance and retreat (movable in the left-right direction in the figure), a flange A ball nut 353 as a first conversion element disposed so that the part f32 faces the flange part f31 and can be moved forward and backward, and a rear end (left end in the figure) is a front end (right end in the figure) of the output shaft 43. A second conversion element that is fixed and is disposed so as to extend forward (rightward in the drawing) in the cylinder 66 and whose front end is rotatably supported by the bearing b3 with respect to the end plate 301 of the cylinder 66. The ball screw shaft 350 is provided.

  The ball screw shaft 350 includes first and second screw portions 352 and 354 that are integrally connected at the center in the axial direction and are formed so that the screw directions are opposite to each other, and rotate together with the output shaft 43. Arranged freely. Then, the ball nut 351 and the first screw portion 352 are screwed together, and the first ball screw 323 is screwed, and the ball nut 353 and the second screw portion 354 are screwed together to form the second ball. A screw 333 is configured.

  Also, the cylinder unit 24 as an amplifying unit is disposed adjacent to the injection motor 22 and adjacent to the first cylinder 58 and the injection device frame 14a (FIG. 2). Cylinder portion 59, first and second cylinder portions 58 and 59, communication pipes 61 and 62 that communicate with each other, and a reservoir tank 63 disposed in the communication pipe 62.

  The first cylinder portion 58 is disposed adjacent to the casing 41, is slidable with respect to the inner peripheral surface of the cylinder 66, and is movable forward and backward within the cylinder 66. A predetermined portion of the ball nuts 351 and 353 functioning as the first pressure receiving member, in the present embodiment, the flange portions f31 and f32 are provided, and the first portion is provided between the ball nuts 351 and 353 in the cylinder 66. The oil chamber 268 surrounds a part of the ball nut 351 and the first screw portion 352 behind the ball nut 351 (leftward in the figure), and further forward of the ball nut 353 with the ball nut 353 and Second oil chambers 269 and 279 are formed so as to surround a part of the second screw portion 354. Seal members SL31 and SL32 are disposed on the outer peripheral surfaces of the flange portions f31 and f32. The seal members SL31 and SL32 provide a clearance between the inner peripheral surface of the cylinder 66 and the outer peripheral surfaces of the flange portions f31 and f32. Sealed. In the present embodiment, the communication pipe 62 is formed in communication with the first oil chamber 73, the second oil chambers 269, 279 and the reservoir tank 63.

  In the present embodiment, a plurality of guide bars 371 as two guide members are installed at predetermined positions in the cylinder 66, and the ball nuts 351 and 353 are arranged along the guide bars 371. , It is advanced and retracted in a state where the rotation is restricted. A seal member SL12 is disposed in a portion where the ball screw shaft 350 passes through the end plate 48 so that the oil in the second oil chamber 269 does not enter the housing 41, and the seal member The space between the inner peripheral surface of the hole of the end plate 48 and the outer peripheral surface of the ball screw shaft 350 is sealed by SL12.

  Further, a seal member (not shown) is disposed between the flange portion f31 and the first screw portion 352 and between the flange portion f32 and the second screw portion 354, and the ball nut 351 is provided by the seal member. And the first screw portion 352 and the screw portion between the ball nut 353 and the second screw portion 354 are sealed.

  When the injection processing means of the control unit drives the injection motor 22 in the injection process, the rotation of the output shaft 43 is transmitted to the ball screw shaft 350, and the first and second screw portions 352 and 354 are rotated. In this case, since the rotation of the ball nuts 351 and 353 is regulated by the guide bar 371, the ball nut 351 is moved forward (moved rightward in the drawing) with the rotation of the first screw portion 352, and the first As the second screw portion 354 rotates, the ball nut 353 is retracted (moved leftward in the figure). Since the first and second oil chambers 268 and 74 are communicated with each other through the communication pipe 61, the ball nut 351 is advanced and the ball nut 353 is retracted, so that the first Oil is discharged from the oil chamber 268 and sent to the second oil chamber 74 via the communication pipe 61. At this time, the pressure generated in the first oil chamber 268 is transmitted to the second oil chamber 74 via the communication pipe 61, and the piston 72 is advanced.

  In this case, the reaction force of the thrust generated in the ball nut 351 attempts to retract the ball screw shaft 350, but the reaction force of the thrust generated in the ball nut 353 attempts to advance the ball screw shaft 350. Reaction force is offset. Therefore, it is not necessary to configure the bearing b1 with a thrust bearing.

  In each of the above-described embodiments, the ratios γ1, γ11 of the pressure receiving areas A2, A12 on the second cylinder portions 59, 99 to the pressure receiving areas A1, A11, A31, A41 on the first cylinder portions 58, 98 side are 1. Although the ratio γ11 can be made smaller than 1, the speed at which the pistons 72 and 122 move forward is set to the pistons 67, 117, 267, and 277, and the flange portions f11, f31, and f32. Can be higher than the forward speed. Therefore, the responsiveness of the screw 16 (FIG. 2) as the first rectilinear moving member and the movable platen 85 as the second rectilinear moving member can be enhanced.

  In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.

It is a conceptual diagram which shows the principal part of the injection apparatus in the 1st Embodiment of this invention. It is a conceptual diagram of the injection molding machine in the 1st Embodiment of this invention. It is a conceptual diagram which shows the principal part of the injection device in the 2nd Embodiment of this invention. It is a conceptual diagram which shows the principal part of the injection device in the 3rd Embodiment of this invention. It is a conceptual diagram which shows the principal part of the injection device in the 4th Embodiment of this invention. It is a conceptual diagram which shows the principal part of the injection device in the 5th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Injection apparatus 12 Mold apparatus 13 Clamping apparatus 16 Screw 21 Measuring motor 22 Injection motor 23, 93 Ball screw units 25, 95 First and second thrust amplifying apparatuses 43, 76 Output shaft 51 Ball nuts 52, 252 Ball screw shaft units 58, 98 First cylinder portion 59, 99 Second cylinder portions 67, 72, 117, 122 Piston 85 Movable platen 91 Mold clamping motors 152, 202, 350 Ball screw shafts 201, 251, 252, 351, 353 Ball nut 267, 277 Piston 271 Rotation transmission bar f11, f31, f32 Flange

Claims (7)

(A) a motion direction conversion unit that is connected to the output shaft of the drive unit and converts the rotational motion into a straight motion by receiving the rotation of the output shaft;
(B) a first cylinder part that generates pressure in accordance with the linear movement of the movement direction conversion part;
(C) a second cylinder portion that is disposed in communication with the first cylinder portion and that allows the pressure receiving member to advance and retreat based on the pressure transmitted from the first cylinder portion;
(D) The molding machine characterized in that the pressure receiving members of the first and second cylinder portions have different pressure receiving areas. (A) The movement direction conversion portion is a first conversion element whose rotation is restricted, and a second conversion element that is disposed so as to freely advance and retreat, is screwed to the first conversion element, and is connected to the output shaft. With conversion elements
(B) The molding machine according to claim 1, wherein the pressure receiving member of the first cylinder part is attached to the second conversion element. (A) The movement direction conversion unit is provided with two first conversion elements whose rotation is restricted, and is freely movable, and is screwed to the first conversion elements and coupled to the output shaft. Two second conversion elements,
(B) The molding machine according to claim 1, wherein the pressure receiving member of the first cylinder part is attached to each of the second conversion elements and connected by a connecting member. (A) The movement direction conversion portion is disposed so as to freely move back and forth, and is a first conversion element whose rotation is restricted, and a second screw threadedly engaged with the first conversion element and connected to the output shaft. With conversion elements
(B) The molding machine according to claim 1, wherein the pressure receiving member of the first cylinder portion is a predetermined portion of the first conversion element. (A) The movement direction conversion section is disposed so as to be movable back and forth, and is screwed into two first conversion elements whose rotation is restricted, and the first conversion elements, and is connected to the output shaft. And two second conversion elements connected together,
(B) The molding machine according to claim 1, wherein the pressure receiving member of the first cylinder portion is a predetermined portion of each of the first conversion elements. (A) The first cylinder part is filled with a lubricant for lubricating the motion direction conversion part,
(B) The molding machine according to any one of claims 1 to 5, wherein the pressure of the first cylinder part is transmitted to the second cylinder part by the lubricant. (A) having a pressure detection part for detecting the pressure in the second cylinder part;
(B) The molding machine according to any one of claims 1 to 6, wherein the drive unit is driven based on the pressure detected by the pressure detection unit.

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