JP2015029997A - Positioning mechanism, temporary pressing device, and powder molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a positioning mechanism having high accuracy of positioning of a follower even in the case of high operation speed, and to provide a temporarily pushing device and a powder molding machine.SOLUTION: A positioning mechanism includes a follower 50 moving on a locus set beforehand, and a drive part 60 connected to the follower. The follower 50 has a contact part 56 to be brought into contact with a part 71 to be contacted provided on a stationary portion side, and the drive part 60 advances the follower 50 at prescribed speed, and stops the follower 50 by bringing the contact part 56 into contact with the part 71 to be contacted.

Description

  The present invention relates to a positioning mechanism for positioning a driven portion that moves on a preset locus, a temporary pressing device that temporarily presses powder filled in a powder forming region of a die, and a powder molding machine including the temporary pressing device. It is about.

  Conventionally, in powder molding processing, for example, powders having different properties are used, and compression molding (two-layer molding) is performed so that these powders are laminated. As a powder molding machine for producing such a molded product, Patent Document 1 discloses that a reciprocating movement is possible in a powder molding region composed of holes formed in a die (die), and the first powder is supplied to the powder molding region. A first powder supply unit (first feeder), a temporary pressing device capable of temporary pressing so as to compress the first powder supplied to the powder molding region, and a second powder supplying second powder to the powder molding region A powder molding machine including a two-powder supply unit (second feeder) is disclosed.

  The temporary pressing device as described above includes a driven unit and a drive unit coupled to the driven unit, and the driven unit includes a temporary pressing punch that temporarily presses the powder supplied to the powder forming region. In this temporary pressing device, after the first powder is supplied, the driven unit is positioned at a predetermined position by the driving unit, whereby the temporary pressing punch is disposed immediately above the powder forming region, and the temporary pressing is performed. Done. As the drive unit, for example, a ball screw drive mechanism including a servo device based on pulse control can be cited.

JP 2002-239793 A

  By the way, in recent years, in the powder molding process, in order to improve the productivity of the molded product, it is also required to increase the operation speed of the temporary pressing device. However, when the drive unit is a ball screw drive mechanism equipped with a servo device by pulse control, if the operation speed is increased, the movement of the driven unit overshoots and the movement amount is larger than a predetermined amount. As a result, the positioning accuracy is sacrificed. When the position accuracy of the driven portion is deteriorated, when the powder forming region is temporarily pressed by the temporary pressing punch, the temporary pressing punch comes into contact with the die and the temporary pressing punch or the die is damaged.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a positioning mechanism, a temporary pressing device, and a powder molding machine with high positioning accuracy of the driven portion even when the operation speed is high. And

  In order to solve the above-described problem, a positioning mechanism according to the present invention includes a driven unit that moves on a preset locus, and a drive unit that is connected to the driven unit, and performs positioning of the driven unit. The driven portion has a contact portion that comes into contact with a contact portion provided on the fixed portion side, and the drive portion advances the driven portion at a predetermined speed, and the contact portion The driven portion is stopped by contacting the contacted portion with the contacted portion.

  According to the positioning mechanism of the present invention, the driven portion has a contact portion that contacts the contacted portion provided on the fixed portion side, and the drive portion advances the driven portion at a predetermined speed, and the contact portion Since the driven portion is stopped by contacting the driven portion with the contacted portion, the driven portion can be positioned at a predetermined position with high accuracy even if the operating speed of the driving portion is increased.

In the positioning mechanism of the present invention, it is preferable that the driven portion includes an action portion and a buffer portion that connects the action portion and the drive portion.
In this case, the driven portion is configured to include an action portion and a buffer portion that connects the action portion and the drive portion, so that the contact portion of the follower portion contacts the contacted portion on the fixed portion side. The overshoot of the drive unit that occurs when the drive unit comes into contact with it can be absorbed by the buffer unit, and the action unit can be reliably positioned at a predetermined position.
Here, as a buffer part, an air cylinder, a hydraulic type absorber, a spring, etc. are mentioned, for example.

In the positioning mechanism of the present invention, it is preferable that a sensor for detecting an overshoot of the driving unit is provided in the buffer unit.
In this case, since the buffer part is provided with a sensor for detecting the overshoot of the drive part, the drive that occurs when the contact part of the driven part comes into contact with the contacted part on the fixed part side and the drive part stops. The overshoot of the part can be detected by the sensor, the influence of the overshoot of the drive part on the positional accuracy of the driven part can be grasped, and the overshoot can be minimized.

A temporary pressing device according to the present invention includes the positioning mechanism described above, and the driven portion includes a temporary pressing punch for temporarily pressing powder filled in a powder forming region of the die on the fixed portion side as an action portion. It is said.
According to the temporary pressing device of the present invention, since the above-described positioning mechanism is provided, the temporary pressing punch can be positioned at a predetermined position with high accuracy. Therefore, even if the operating speed of the drive unit is increased, it is possible to place the temporary pressing punch with high positional accuracy directly above the powder forming region formed on the die and reliably press the powder.

Moreover, the powder molding machine of this invention is equipped with the above-mentioned temporary pressing apparatus.
According to the powder molding machine of the present invention, since the temporary pressing device described above is provided, the time required for the temporary pressing device to temporarily press the powder molding region can be shortened, and the productivity of the powder molded product is improved.

  According to the present invention, it is possible to provide a positioning mechanism, a temporary pressing device, and a powder molding machine with high positioning accuracy of the driven portion even when the operation speed is high.

It is the schematic explanatory drawing which looked at the positioning mechanism, temporary pressing apparatus, and powder molding machine which concern on one Embodiment of this invention from the upper surface. It is the schematic explanatory drawing which looked at the positioning mechanism, temporary pressing apparatus, and powder molding machine which concern on one Embodiment of this invention from the side surface. It is a schematic explanatory drawing for demonstrating operation | movement of the positioning mechanism and temporary pressing apparatus which concern on one Embodiment. It is a schematic explanatory drawing for demonstrating operation | movement of the positioning mechanism and temporary pressing apparatus which concern on one Embodiment.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
In FIG. 1, the schematic explanatory drawing which looked at the positioning mechanism 40, the temporary pressing apparatus 30, and the powder molding machine 1 which concern on one Embodiment of this invention from the upper surface is shown. Moreover, the schematic explanatory drawing which looked at the positioning mechanism 40, the temporary pressing apparatus 30, and the powder molding machine 1 which concern on one Embodiment of this invention from the side in FIG. 2 is shown.

The powder molding machine 1 includes, for example, a die 10 (die) provided with a powder molding area A, a lower punch 20 inserted into the powder molding area A of the die 10 from below, and a powder molding area A. A first feeder for supplying the first powder, a temporary pressing device 30 for temporarily pressing the first powder filled in the powder molding region A, a second feeder for supplying the second powder to the powder molding region A, An upper punch for punching the first powder and the second powder from the upper side of the die 10.
The powder molding region A means a region where the powder filled in the mold is molded by a punch.

  This powder molding machine 1 is for supplying different powders by a first feeder and a second feeder and forming a two-layered powder molded product by compression molding. In the present embodiment, two powder molding machines 1 can be compression-molded simultaneously. That is, two molded products can be taken in one molding process.

The die 10 is formed with a cylindrical through hole as the powder molding region A. For example, a lower punch 20 is inserted below the powder forming region A, and the powder is filled by the first feeder in a state where the lower punch 20 is inserted. Done. In the present embodiment, the die 10 has two through holes and two powder forming regions A.
The first feeder and the second feeder are capable of reciprocating toward the powder molding area A, move immediately above the powder molding area A at a predetermined timing, and supply and fill each powder into the powder molding area A. It is like that.

The temporary pressing device 30 includes a positioning mechanism 40 that positions a driven unit 50 described later, and is capable of reciprocating toward the powder forming region A.
The positioning mechanism 40 includes a driven unit 50 that moves on a preset drive and a drive unit 60 coupled to the driven unit 50. In the present embodiment, the driven unit 50 is configured to advance and retreat on a straight line (left and right direction in FIGS. 1 and 2).

  The drive unit 60 includes a servo motor controlled by pulse control, a ball screw 61 that moves forward and backward on the axis O by the servo motor, and a pedestal 62 that moves back and forth (left and right in FIGS. 1 and 2) by the ball screw 61. And. For example, the pedestal 62 is moved in the left direction when the ball screw 61 is sent in the left direction in FIG. 2 by the servo motor.

  The driven portion 50 includes a temporary pressing punch 51 (acting portion) for temporarily pressing the powder filled in the powder forming region A of the die 10, a frame 52 to which the temporary pressing punch 51 is fixed, and a downward direction from the frame 52. A plurality of guide posts 53 extending, a punch-side air cylinder 54 provided between the guide posts 53, a carriage 55 on which the guide posts 53 and the punch-side air cylinder 54 are placed, and a fixed base 70 A contact portion 56 that contacts the provided contacted portion 71 (stopper), a connection rod 57 attached to the rear end side of the carriage 55 (the right end of the carriage 55 in FIGS. 1 and 2), and the connection rod And a drive part side air cylinder 58 (buffer part) that is attached to 57 and is connected to the pedestal 62 of the drive part 60.

The temporary pressing punch 51 is a punch that is inserted into the powder molding region A from the upper side of the die 10 and temporarily presses the powder filled in the powder molding region A together with the lower punch 20. The temporary pressing punch 51 has a cylindrical shape corresponding to the shape of the powder molding region A and is movable in the vertical direction. The temporary pressing punch 51 is fixed to the frame 52, but is fixed at a position one step lower than the attachment position of the guide post 53 to the frame 52.
The punch-side air cylinder 54 is a cushioning material for absorbing an impact generated when the powder filled in the powder molding region A is temporarily pressed by the temporary pressing punch 51 and the lower punch 20.

The carriage 55 has a chassis 59 and wheels 55a attached to the chassis 59, and the wheels 55a are disposed on the rail 72 so that the carriage 55 can advance and retreat in the left-right direction. The carriage 55 moves through the drive unit side air cylinder 58 and the connecting rod 57 when the pedestal 62 is moved by the drive unit 60. In this embodiment, the contact portion 56 described above is attached to the carriage 55, and the contact of the contact portion 56 with the contacted portion 71 provided on the fixed base 70 stops the movement of the carriage 55. It is like that. That is, the contact portion 56 has a function as a stopper.
Here, when the contact portion 56 and the contacted portion 71 are in contact with each other, the position of the temporary pressing punch 51 is arranged immediately above the powder forming region A of the die 10. The punch 51 can be inserted into the powder molding region A.

The connecting rod 57 is a shaft that connects the drive unit side air cylinder 58 and the carriage 55.
The drive unit side air cylinder 58 is a cushioning material for absorbing an impact generated when the above-described contact portion 56 contacts the contacted portion 71. In the present embodiment, a sensor 80 for detecting overshoot of the drive unit 60 is attached to the drive unit side air cylinder 58.

  In this embodiment, two temporary pressing punches 51 are arranged in parallel in a direction orthogonal to the traveling direction of the carriage 55 (the depth direction in FIG. 2), and two powder molding regions A can be temporarily pressed simultaneously. It is like that. That is, the frame 52, the punch-side air cylinder 54, and the guide post 53 are also provided corresponding to the number of the temporary pressing punches 51.

  Next, the operation of the temporary pressing device 30 and the positioning mechanism 40 according to this embodiment will be described below with reference to FIGS. 3 and 4 by taking as an example the case of manufacturing a powder molded product having a two-layer structure. .

First, the lower punch 20 is inserted into the powder forming region A of the die 10 and arranged so as to close the lower side of the die 10.
Next, the first feeder is moved directly above the powder molding area A, the first powder is filled in the powder molding area A, and the first feeder is returned to its original position.
Next, the temporary pressing punch 51 is moved immediately above the powder forming region A, and the lower punch 20 and the temporary pressing punch 51 are temporarily pressed so as to compress the powder filled in the powder forming region A. Below, the method of temporarily pressing will be described more specifically.

  First, in the drive unit 60, the ball screw 61 is moved in the left direction of the axis O, and the pedestal 62 is moved in the direction in which the temporary pressing punch 51 approaches the powder forming region A (left direction in FIG. 3). At this time, the carriage 55 moves to the left at a predetermined speed via the drive unit side air cylinder 58 and the connecting rod 57. And if the trolley | bogie 55 moves to a predetermined position, the contact part 56 will contact | abut the to-be-contacted part 71, and the movement of the trolley | bogie 55 will be stopped (refer FIG. 3). At this time, the temporary pressing punch 51 is arranged immediately above the powder forming region A.

  In the present embodiment, the moving speed of the carriage 55 is set to a predetermined speed, and is not configured to decelerate until the contact part 56 contacts the contacted part 71. When the contact portion 56 contacts the contacted portion 71, a reaction force may act in the direction opposite to the traveling direction of the carriage 55 (right direction in FIG. 3). Thus, as shown in FIG. 4, it is absorbed by the pressure of air, and the carriage 55 is accurately stopped at a predetermined position. More specifically, when the length of the drive unit side air cylinder 58 indicated by L1 in FIG. 3 is equal to or longer than the length of L2 shown in FIG. 4 (less than the length of L1), The force is absorbed by the drive unit side air cylinder 58. Further, the drive unit side air cylinder 58 also absorbs overshoot of the drive unit 60.

  Next, the temporary pressing punch 51 is moved downward to temporarily press the powder forming region A, and the temporary pressing punch 51 is returned to the original position. Next, in the drive unit 60, the ball screw 61 is sent to the right, the pedestal 62 is moved to the right, and the carriage 55 is returned to the original position.

Next, the second feeder is moved immediately above the powder molding region A, filled with the second powder, and the second feeder is returned to its original position.
Then, compression molding is performed by the lower punch 20 and the upper punch, and a powder molded product having a two-layer structure is manufactured.
Thus, the manufacture of the powder molded product using the powder molding machine 1 according to the present embodiment is completed.

  According to the powder molding machine 1, the temporary pressing device 30, and the positioning mechanism 40 according to the present embodiment configured as described above, the carriage 55 (the driven part 50) is in contact with the fixed base 70. A contact portion 56 that comes into contact with the portion 71, the drive portion 60 advances the carriage 55 (driven portion 50) at a predetermined speed, and the contact portion 56 is brought into contact with the contacted portion 71. Therefore, even if the operating speed of the drive unit 60 is increased, the driven unit 50 can be positioned at a predetermined position with high accuracy. Therefore, even if the operation speed of the drive unit 60 is high, the temporary pressing punch 51 can be disposed at a predetermined position, and the powder forming region A can be temporarily pressed.

  Further, since the driven unit 50 includes a drive unit side air cylinder 58 (buffer unit) that connects the driven unit 50 side and the drive unit 60 side, the contact portion 56 of the driven unit 50 is fixed. The overshoot of the drive unit 60 that occurs when the drive unit 60 stops by contacting the contacted portion 71 of the drive unit 60 can be absorbed by the drive unit side air cylinder 58, and the temporary pressing punch 51 is reliably placed at a predetermined position. Positioning becomes possible.

  Furthermore, since the drive unit side air cylinder 58 is provided with a sensor 80 that detects overshoot of the drive unit 60, the contact portion 56 of the carriage 55 (the driven portion 50) contacts the contacted portion 71. The overshoot of the drive unit 60 that occurs when the drive unit 60 stops can be detected by the sensor 80, and the influence of the overshoot of the drive unit 60 on the positional accuracy of the temporary press punch 51 can be grasped. It can be minimized.

  In addition, according to the powder molding machine 1 according to the present embodiment, the provisional pressing device 30 described above is provided, so that the operation speed of the drive unit 60 is increased and the time required to temporarily press the powder molding region A is shortened. This improves the productivity of the powder molded product.

  The powder molding machine, the temporary pressing device, and the positioning mechanism according to the embodiment of the present invention have been described above. However, the present invention is not limited to this, and may be appropriately selected without departing from the technical idea of the present invention. It can be changed.

  In addition, in the said embodiment, although the case where the positioning mechanism was provided with the drive part side air cylinder (air cylinder, buffer part) was demonstrated, it does not need to be provided with the drive part side air cylinder. Moreover, although the case where the drive part side air cylinder (air cylinder, buffer part) was provided with the sensor which detects the overshoot of a drive part was demonstrated, this sensor may not be provided.

  In the above-described embodiment, the case where the temporary pressing device includes the positioning mechanism has been described. However, the positioning mechanism may be a variety of devices including processing devices and conveying devices other than the temporary pressing device that require positioning. Can be applied to. Moreover, you may use NC drive mechanisms other than a servomotor for a drive part. For example, a stepping motor (pulse motor) having a position information detection function, an inverter-controlled induction motor, or the like may be used as the drive unit.

  In the above-described embodiment, the case where the temporary pressing device includes a carriage and moves on the rail (on a straight line) has been described. However, the present invention is not limited to this, and is set in advance, for example, on an arc. You may be set as the structure which moves on a locus | trajectory.

A Powder molding region 1 Powder molding machine 30 Temporary pressing device 40 Positioning mechanism 50 Driven portion 51 Temporary pressing punch (action portion)
56 Contacting part 58 Driving part side air cylinder (buffer part)
60 Drive part 71 Contacted part 80 Sensor

Claims (5)

A positioning mechanism that includes a driven portion that moves on a predetermined trajectory and a drive portion that is coupled to the driven portion, and that positions the driven portion;
The driven portion has a contact portion that contacts a contacted portion provided on the fixed portion side,
The positioning mechanism characterized in that the drive unit advances the driven unit at a predetermined speed and stops the driven unit by bringing the contact unit into contact with the contacted unit.   The positioning mechanism according to claim 1, wherein the driven portion includes an action portion and a buffer portion that connects the action portion and the drive portion.   The positioning mechanism according to claim 2, wherein a sensor that detects an overshoot of the drive unit is provided in the buffer unit. A positioning mechanism according to any one of claims 1 to 3,
The temporary pressing device, wherein the driven portion has a temporary pressing punch for temporarily pressing the powder filled in the powder forming region of the die on the fixed portion side as an action portion.   A powder molding machine comprising the temporary pressing device according to claim 4.

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