JP2009072965A - Demolding device of molded screw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the demolding device of molded screw whose structure is made simple by virtue of a mold opening operation since a motor or the like are not used as the power source of the rotation of a screw core, which is performed in order to pull out an injection-molded screw part from a screw core, and which can prevent the screw part which is pulled out from being brought into contact with lubricant oil or the like of a driving mechanism. <P>SOLUTION: A slider 2 is freely slidably disposed on a movable plate 7 which moves with a lower plate 8 on the movable side with respect to an upper plate 9 serving as the fixed side when the mold is opened and closed, in a direction orthogonal to a moving direction. An operation pin 3 in an oblique direction with respect to the moving direction of the movable plate 7 is disposed on the upper plate 9 and is loosely inserted into a through hole 2a formed in the oblique direction in the slider 2. A rack 4 is disposed on the side surface of the slider 2 and is engaged with a pinion gear 6 fitted to the screw core 5. The slider 2 is moved while being guided by the operational pin 3 in accordance with the movement of the lower plate 8, the pinion gear 6 is rotated in accordance with the movement of the rack 4 and the screw core 5 is rotated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a molding screw demolding device for detaching a screw component molded using a mold from the mold.

  For example, when molding a female screw part made of synthetic resin, the resin material is injected into a cavity in which a male screw that is screwed into the female screw part is formed. In order to release the female screw part, which is a molded product, from the mold after molding, the male screw is rotated and extracted using the screwed relationship with the female screw part. For this reason, a mold for molding a screw part is provided with a molding screw demolding device for rotating a male screw.

  The demolding device is provided with a mechanism for rotating the screw core with respect to the formed screw. A motor is used as an operation source of the rotation, and a pinion gear for rotating the screw core is provided. A mechanism is used in which the pinion gear is engaged with a rack whose longitudinal direction is parallel to the direction in which the screw parts are removed, and the rack is slid by a cylinder device.

  In the molding screw demolding apparatus described above, a drive source such as a motor or a cylinder apparatus becomes large, which may increase the size of the demolding apparatus and increase the size of the injection molding machine. In addition, since the rack is arranged in parallel with the screw component removal direction, the removed screw component may come into contact with the rack. For example, when the molded screw component is for fastening a medical device or the like, if the lubricant applied to the rack adheres to the screw component, dust or the like adheres to the lubricant. Therefore, there is a possibility that it may become a problem in a medical device or the like, and it is inconvenient to contact the rack. In addition, it is inconvenient if these racks and pinion gears are exposed for the safety of the molding operation, so a cover or the like can be attached, but this cover protrudes greatly to the side of the device, and the installation space of the device is reduced. There is a risk of increasing the size.

  Accordingly, the present invention provides a molded screw demolding device that has a simple structure, does not require an increase in the size of the device, and that prevents lubricating oil or the like from adhering to the molded screw component as much as possible. In particular, an object of the present invention is to provide a molding screw demolding apparatus suitable for molding a multi-threaded screw such as a screw component used in a medical device.

  As a technical means for achieving the above object, a molded screw demolding apparatus according to the present invention is a screw component that supplies a molding material to a screw mold formed on a screw core and is screwed into the screw mold. And a mold opening direction in which the movable side member moves with respect to the fixed side member in the mold screw releasing device for removing the molded screw part from the screw core. The movable plate is moved to the movable plate, and the movable plate is provided with a sliding block that slides in a direction intersecting the moving direction of the movable plate, and the linear motion caused by the movement of the sliding block is changed to the rotational motion that rotates the screw core. And a power conversion mechanism for converting, wherein the screw component is removed from the screw core and removed by rotation of the screw core.

  Due to the movement of the movable plate when the mold is opened, the sliding block moves in a direction crossing the moving direction of the movable plate. The linear motion caused by the movement of the sliding block is converted into a rotational motion with the direction orthogonal to the direction of the motion as an axis. When the screw core is rotated by this rotational movement, the screw mold formed on the screw core is rotated. Therefore, the screw parts formed by the screw mold and screwed into the screw mold are the screws. It moves relative to the screw core due to the joint relationship. By this movement of the screw component, the screw component is removed from the screw core and removed from the mold.

  According to a second aspect of the present invention, there is provided a molding screw demolding device in which a guide hole is formed in the sliding block, the guide screw is fixed to the stationary member, and the direction is inclined with respect to the moving direction of the movable plate. An operating pin having a longitudinal direction is inserted into the guide hole so that the sliding block responds during movement of the mold opening operation of the movable plate.

  As a mechanism for moving the sliding block by the movement of the movable plate, the operating pin and the guide hole are combined. When the movable plate moves, the positional relationship between the operating pin and the sliding block gradually changes. Since the operation pin is inclined, the sliding block is gradually guided to move with respect to the movable plate, and this movement is converted into rotational motion by the motion conversion mechanism to rotate the screw core. Let The guide hole is formed so as to be inclined at an equal angle to the operation pin since the operation pin is loosely inserted.

  According to a third aspect of the present invention, there is provided a molded screw demolding apparatus comprising: a rack formed on a side surface of the sliding block by the power conversion mechanism; and a pinion gear fitted to the screw core engaged with the rack. It is characterized by becoming.

  That is, the linear movement of the sliding block is transmitted to the pinion gear via the rack, and the pinion gear is rotated. By fitting this pinion gear to the screw core, the screw core is rotated by the rotation of the pinion gear.

  According to a fourth aspect of the present invention, there is provided a molded screw removing apparatus, wherein the screw component is a multi-threaded screw.

  When the sliding block is moved by moving the movable plate, in order to increase the moving distance, it is necessary to increase the moving distance of the movable plate, which may increase the size of the mold clamping device. For this reason, when the formed screw is a multi-threaded screw, even if the moving distance of the sliding block is small, the formed screw component has a large stroke, so that it can be surely removed.

  According to a fifth aspect of the present invention, there is provided an apparatus for removing a formed screw, wherein the screw core forms the female screw portion of the screw component.

  According to the molded screw demolding apparatus according to the present invention, the screw core is rotated by moving the sliding block by the mold opening operation, and the molded screw is removed. Therefore, an external power source such as a motor is used. It is not necessary, and it is possible to provide a molding screw demolding device that can reliably remove the molding screw with a simple structure, thereby reducing the manufacturing cost. In addition, due to the simplification of the structure of the apparatus, the apparatus can be easily maintained and the cost required for the maintenance can be reduced.

  According to the molding screw demolding apparatus according to the invention of claim 2, the sliding block is formed by a combination of the operating pin fixed in a tilted state to the fixed side member and the through hole formed in the sliding block. Since the mechanism to be moved is configured, the structure is simple and the parts constituting these mechanisms are easy to manufacture, and the positioning of the operation pins and the through holes is not complicated and the assembly work is not complicated. It becomes easy.

  Further, according to the molded screw removing apparatus according to the invention of claim 3, since the rack and pinion are combined, the movement of the sliding block can be reliably transmitted to the screw core and the screw core can be reliably rotated. it can. Therefore, the formed screw can be reliably removed from the screw core.

  Further, according to the molded screw removing apparatus according to the invention of claim 4, since the stroke with respect to the rotation angle is large in the case of a multi-threaded screw, it moves greatly at a small number of rotations, so that the moving amount of the sliding block is small That is, the formed screw can be moved greatly with a small number of rotations of the screw core, so that it can be easily removed when the mold is opened. Since many multi-threaded screws, particularly double-threaded screws, are often used in screw parts used in medical equipment, it is possible to provide a demolding device that is suitable for molding screw parts of medical equipment.

  Further, since the sliding block is moved in a direction crossing the moving direction when the movable plate is opened, there is no need to provide a driving component such as a rack in the direction along the longitudinal direction of the forming screw, and the forming screw When removed from the mold, contact with the drive component is prevented as much as possible. For this reason, the lubricant applied to the drive component does not adhere to the molded screw, and from this point, the molded screw demolding device suitable for processing by injection molding of the screw component used in medical equipment is provided. be able to.

  Hereinafter, based on the illustrated preferred embodiment, a molding screw demolding apparatus according to the present invention will be described in detail.

  A screw component 11 molded according to this embodiment is shown in FIG. FIG. 4A is a front view, FIG. 5B is a side view, and FIG. As shown in FIG. 2C, the screw component 11 has a female screw portion 11b formed on the inner peripheral surface of a cylindrical head portion 11a, and a boss portion 11c at the center of the head portion 11a. The shape is formed. In addition, a through hole 11d having an appropriate number of stepped portions including the head portion 11a and the boss portion 11c is formed.

  FIG. 1 is a schematic perspective view showing a main part of a demolding device 1 for a screw component 11 which is a molded screw according to the present invention, and FIG. 2 is a front view of the molded screw demolding device in a mold-closed state. 3 is a schematic plan view, and FIG. 4 is a schematic plan view of the main part shown in FIG. The demolding device 1 includes a slider 2 and a working pin 3 which are sliding blocks, a rack 4 formed on a side surface of the slider 2, a male screw which meshes with the rack 4 and which forms a screw component 11 which is a screw component. And a pinion gear 6 fitted to a screw core 5 provided with a screw mold 5a.

  As shown in FIGS. 2 and 3, the slider 2 is slidably supported on the movable plate 7 in a direction perpendicular to the longitudinal direction of the screw core 5. That is, as shown in FIG. 3, a substantially rectangular opening 7a is formed at the center of the movable plate 7, and the slider 2 is accommodated in the opening 7a and guided to the inner edge of the opening 7a. Is slidable in the direction of the arrow P in FIG. The movable plate 7 is connected to a lower plate 8 that is a movable side member, and the mold is opened and closed by opening and closing the lower plate 8 and the upper plate 9 that is a fixed side member. The opening / closing direction is a direction parallel to the longitudinal direction of the screw core 5, and the slider 2 is slidable in a direction orthogonal to the opening / closing direction of the mold.

  A bracket plate 10 is attached to the side of the upper upper plate 9, and the operating pin 3 is fixed to the bracket plate 10. As shown in FIG. 2, the operating pin 3 is provided in a state where it is inclined at an appropriate angle with respect to the opening and closing direction of the mold. On the other hand, as shown in FIG. 3, the slider 2 is formed with a through hole 2a that is inclined in accordance with the inclination of the operating pin 3 so that the operating pin 3 is loosely inserted.

  The screw core 5 is disposed on the side of the slider 2 and at a position facing the rack 4. Further, as shown in FIG. 3, a gear accommodating portion 7b having an inner wall further recessed is formed in a part of the opening 7a of the movable plate 7. The gear accommodating portion 7b is formed in a number corresponding to the number of screw parts 11 to be molded simultaneously. The pinion gear 6 is positioned in the gear accommodating portion 7b and meshed with the rack 4.

  FIG. 7 shows a state at the time of mold clamping, and FIG. 8 shows a state at the time of mold opening. At the time of mold clamping, the screw core 5 protrudes into a cavity 12 formed by the lower plate 8 and the upper plate 9. On the other hand, a core pin 9a provided on the upper plate 9 protrudes into the cavity 12 to constitute a mold for forming the through hole 11d of the screw part 11. The cavity 12 communicates with the injection cylinder of the injection device through a tunnel gate 13 and a runner 14 through a sprue 16 connected to a nozzle 15 of the injection device (not shown).

  A protruding pin 17 is provided at the center of the screw core 5 so as to be slidable in the longitudinal direction of the screw core 5, and a protruding pin 18 is provided at a position facing the sprue 16 of the lower plate 8. Yes.

  The operation of the molding screw removing apparatus according to the present invention configured as described above will be described below.

  As shown in FIGS. 2 and 7, when the molding material is injected from the nozzle 15 with the lower plate 8 being pressed against the upper plate 9, the molding material is sprue 16, runner 14, tunnel gate 13 and the like. Through which the cavity 12 is filled. A screw core 5 and a core pin 9a protrude from the cavity 12, and a female screw portion 11b of the screw component 11 is formed by the screw core 5, and a through hole 11d is formed by the core pin 9a, thereby forming the screw component 11. .

  When the screw part 11 is formed, the lower plate 8 is moved with respect to the upper plate 9 to open the mold. The mold opening operation of the lower plate 8 moves in the longitudinal direction of the screw core 5 from the position shown in FIG. 2 to the position shown in FIG. 5 or from the position shown in FIG. 7 to the position shown in FIG. Is done. When the lower plate 8 moves in the mold opening direction, the slider 2 having the through hole 2a through which the operation pin 3 provided at an inclination is inserted is guided by the operation pin 3 to the movable plate 7. It gradually moves from the position shown in FIG. 3 to the position shown in FIG.

  As the slider 2 moves, the rack 4 formed on the side surface of the slider 2 moves. Since the pinion gear 6 meshes with the rack 4, the pinion gear 6 rotates. Since the pinion gear 6 is fitted to the screw core 5, the screw core 5 also rotates together with the pinion gear 6. The screw core 5 is formed with a female thread portion 11b of the screw component 11, and the molding material filled in the cavity 12 is hardened in a state where it is screwed with the screw mold 5a of the male thread of the screw core 5. For this reason, as the screw core 5 rotates, the formed screw component 11 moves relative to the screw core 5 due to the screwed relationship with the male screw of the screw mold 5a. By moving with respect to the screw core 5, the molded screw component 11 is removed from the screw core 5 and taken out.

  Further, the protrusion pins 17 and 18 are protruded from the cavity 12 of the lower plate 8 with respect to the movement of the lower plate 8, and the formed screw part 11 is protruded.

  As described above, since the pinion gear 6 is rotated by the movement of the rack 4 provided on the slider 2, the moving amount of the screw component 11 formed by the screw mold 5a of the screw core 5 with respect to the screw core 5 is the same as that of the rack 4. It depends on the amount of movement, that is, the amount of movement of the slider 2. Since the amount of movement of the slider 2 is regulated by the length of the opening 7a of the movable plate 7, the length of the operating pin 3, the amount of movement of the lower plate 8, etc., the length of the formed screw component 11 is large. Therefore, the amount of movement of the slider 2 must be increased. However, increasing these increases the size of the demolding device and the mold clamping device. For this reason, it is preferable that the movement amount of the molded screw component 11 with respect to the screw core 5 is large at a small rotation angle of the pinion gear 6. There are multi-threaded screws having a large stroke with respect to the rotation angle of the screw core 5, and when forming multi-threaded screws, the screws can be easily screwed up without increasing the size of the demolding device or mold clamping device. Parts can be removed. In addition, since a double thread is frequently used for screw parts used in medical equipment, it is a demolding apparatus suitable for injection molding of screw parts used in medical equipment.

  According to the molding screw demolding apparatus according to the present invention, the mold can be demolded in conjunction with the mold opening operation without using a power source such as a motor, which contributes to energy saving and simplifies the structure. Therefore, it can be surely removed from the mold, and this contributes to simplification of forming a screw component having a large stroke, such as a multi-thread screw.

It is a perspective view which shows schematic structure of the mold release apparatus of the shaping | molding screw which concerns on this invention. It is a front view of the mold removal apparatus of the shaping | molding screw in a mold closed state. FIG. 2 is a schematic plan view of a molding screw demolding device, showing a case where the mold is in a closed state. It is a schematic plan view of the principal part of a demolding apparatus. It is a front view of the mold removal apparatus of the forming screw in a mold open state. FIG. 3 is a schematic plan view of a molding screw demolding device, showing a case where the mold is in an open state. It is a figure explaining the metal mold | die provided with the mold removal apparatus which concerns on this invention, and the mold closed state is shown. The mold opening state of the molding die shown in FIG. 7 is shown. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows an example of the screw components suitable for shape | molding with the injection molding machine provided with the mold release apparatus which concerns on this invention, (a) is a front view, (b) is a side view, (c) is a longitudinal cross-sectional view. It is.

Explanation of symbols

1 Demolding device 2 Slider (sliding block)
2a Through-hole 3 Actuation pin 4 Rack 5 Screw core
5a Screw type 6 Pinion gear 7 Movable plate
7a Opening 8 Lower plate 9 Upper plate
9a Core pin
10 Bracket plate
11 Screw parts
11b Female thread
11d through hole
12 cavity

Claims (5)

In a molding screw demolding device for supplying a molding material to a screw mold formed on a screw core, molding a screw component to be screwed with the screw mold, and demolding the molded screw component from the screw core ,
A movable plate is provided that moves in the mold opening direction together with the movable side member by a mold opening operation in which the movable side member moves relative to the fixed side member.
The movable plate is provided with a sliding block that slides in a direction intersecting the moving direction of the movable plate,
A power conversion mechanism that converts linear motion due to movement of the sliding block into rotational motion that rotates the screw core;
An apparatus for removing a formed screw, wherein the screw component is removed from the screw core and removed by rotation of the screw core.   A guide hole is formed in the sliding block, fixed to the fixed side member, and an operating pin whose longitudinal direction is inclined with respect to the moving direction of the movable plate is loosely inserted into the guide hole. 2. The molding screw demolding device according to claim 1, wherein the sliding block responds when the movable plate is moved in the mold opening operation.   The molding according to claim 1, wherein the power conversion mechanism includes a rack formed on a side surface of the sliding block and a pinion gear fitted to the screw core that meshes with the rack. Screw demolding device.   The molded screw removing apparatus according to any one of claims 1 to 3, wherein the screw component is a multi-threaded screw.   The molded screw removing apparatus according to any one of claims 1 to 4, wherein the screw core forms the female screw portion of the screw component.

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