JP4764097B2 - Pressurizing device - Google Patents

Description

  The present invention relates to a pressurizing device that performs pressurization by converting the rotational force of a motor into axial thrust of a feed screw.

Examples of the pressurizing device (pressing press) that pressurizes various workpieces include a hydraulic press that pressurizes using a hydraulic cylinder, an electric crank press that pressurizes using a motor and a crank, a motor, and a feed There are electric presses that pressurize using screws.
In particular, as a pressurizing device that performs pressurization using a motor and a feed screw, for example, there is one disclosed in Patent Document 1.

  The pressurizing device of Patent Document 1 uses a hollow motor and a ball screw, converts the rotational force of the hollow motor into an axial thrust by the ball screw, and pressurizes the work. In this pressurizing device, a ball screw is inserted into the hollow hole of the hollow motor, a nut screwed into the ball screw is directly coupled to the rotor of the hollow motor, and the radial load and thrust applied to the ball screw by the rotor bearing Under weight. Thereby, the axial direction length of a pressurization apparatus is made small, and the pressurization apparatus which can output a high thrust with compactness is formed.

  Moreover, as a multistage pressurizing apparatus that pressurizes a workpiece in a plurality of stages, there is one disclosed in Patent Document 2, for example. The multistage electric powder molding machine of Patent Document 2 includes a die and a punch that form a molding space, and the punch is divided into three partial punches arranged on the same axis. Each partial punch can be moved independently, the second partial punch is moved along the inner periphery of the first partial punch arranged on the outermost periphery, and the third partial punch is moved along the inner periphery of the second partial punch. ing.

However, the multistage pressurizing apparatus of Patent Document 2 has the following problems.
That is, in Patent Document 2, each partial punch is arranged in a pressure ram, and each pressure ram is configured to be movable by a plurality of linear movement mechanisms and servomotors. A plurality of linear movement mechanisms and servo motors are arranged at positions symmetrical with respect to the center of pressure applied by the punch.

And the thrust by a linear moving mechanism and a servomotor always acts on the left-right symmetrical position eccentric from the pressurization center (axial center of each partial punch) which pressurizes with each partial punch. Therefore, when pressure is applied by each partial punch, an eccentric load may be applied to the workpiece as a powder molded product, which may reduce the processing accuracy of the workpiece.
Further, when pressurization is performed with an eccentric load applied to the workpiece, an eccentric load as a reaction force due to the pressurization is applied to the pressurizing device. For this reason, in order to ensure the strength of the apparatus and perform stable pressurization, it has been necessary to enlarge the apparatus.

JP 2004-314118 A Japanese Patent No. 2720118

  The present invention has been made in view of such conventional problems, and can improve the machining accuracy of a workpiece by pressurization, prevent an eccentric load from being applied in the apparatus, and reduce the size of the apparatus. An object of the present invention is to provide a pressurizing device that can be used.

1st invention is a pressurization apparatus provided with the 1st pressurization unit and the 2nd pressurization unit,
The first pressure unit includes a first hollow motor having a first hollow hole in the first rotor;
A first base portion provided with a first stator in the first hollow motor;
A first nut that includes a first female thread portion and rotates integrally with the first rotor in a state of being coupled to the first rotor;
A first feed screw that includes a first male thread portion that is screwed into the first female thread portion, and that advances and retreats in the first hollow hole as the first nut rotates;
A first pressure member disposed at the tip of the first feed screw;
A first guide part disposed on the first base part for guiding the advancement and retraction of the first pressurizing part in a state where the first pressurizing part is prevented from rotating;
A first bearing portion disposed on an outer peripheral side of the first nut and receiving a thrust load applied in an axial direction of the first feed screw;
The first feed screw has a screw shaft through hole formed through the shaft, and has the same outer diameter over the entire length except for an end attached to the first pressure member. It consists of one member,
The second pressure unit includes a second hollow motor provided with a second hollow hole in the second rotor;
A second base portion fixed to the first base portion and provided with a second stator in the second hollow motor;
A second nut that includes a second female thread portion and rotates integrally with the second rotor in a state of being coupled to the second rotor;
A second feed screw that includes a second male thread portion that is screwed into the second female thread portion, and that advances and retreats in the second hollow hole and in the screw shaft through-hole as the second nut rotates.
A second pressure member disposed at the tip of the second feed screw;
A second guide part disposed on the second base part for guiding the advancement and retraction of the second pressure part in a state where the rotation of the second pressure part is performed;
A second bearing portion disposed on an outer peripheral side of the second nut and receiving a thrust load applied in an axial direction of the second feed screw;
The second feed screw, while placed through to the screw axis through the mouth, Ru that the tip is coupled to the second pressure which is disposed on the distal end side than the first pressing tare And a single member formed with the same outer diameter over the entire length except for the end attached to the second pressure part,
A through hole is formed in the tip side surface of the second pressurizing part, and a second punch is disposed around the axis of the second feed screw,
A first punch is disposed on the tip side surface of the first pressurizing portion with the shaft center of the first feed screw as the center, and the first punch is inserted into the first pressurizing hole through the through hole. Connected to the pressure part,
In the pressurizing apparatus, the central axis of the second hollow motor and the central axis of the first hollow motor are arranged on the same line.

  The pressurizing device of the present invention includes the first pressurizing unit and the second pressurizing unit, and converts the rotational force of each hollow motor into a thrust in the axial direction by using each feed screw and each nut. It is an electric pressurizing apparatus which can pressurize from each said pressurization part.

When operating the first pressurizing unit, the first stator of the first hollow motor is energized to rotate the first rotor of the first hollow motor. At this time, the first nut rotates together with the rotation of the first rotor, and the rotational force of the first nut advances and retracts in the axial direction of the first feed screw by screwing the first female screw portion and the first male screw portion. Is converted into thrust. Then, the first feed screw and the first pressurizing portion are advanced and retracted in a state where the first feed screw and the first pressurizing portion are guided and stopped by the first guide portion, thereby pressurizing the workpiece by the first pressurizing portion. Can do.
Also, when the second pressure unit is operated, the operations of the second hollow motor, the second nut, the second feed screw, the second guide portion, and the second pressure portion are the same as those of the first pressure unit. It is the same as operation | movement, and can pressurize with respect to a workpiece | work by the 2nd pressurization part.

In the first pressurizing unit, a thrust load applied in the axial direction of the first feed screw by a reaction force generated when pressure is applied by the first pressurizing unit can be received by the first bearing unit. Therefore, it is possible to prevent the reaction force from the first pressure unit from being directly applied to the first rotor.
Similarly, in the second pressure unit, a thrust load applied in the axial direction of the second feed screw by a reaction force generated when pressure is applied by the second pressure unit can be received by the second bearing unit. it can. Therefore, it is possible to prevent the reaction force from the second pressure unit from being directly applied to the second rotor.

Further, in the first pressure unit, the first rotor of the first hollow motor is provided with a first hollow hole, and the first feed screw is arranged in a part of the first hollow hole in the first rotor. This can be done in the arranged state. Further, the first nut is coupled to the first rotor without passing through a speed reducer such as a gear or a pulley, so that a space for disposing the speed reducer between the first hollow motor and the first nut can be eliminated. it can. Further, the first bearing portion is disposed on the outer peripheral side of the first nut.
Also in the second pressure unit, the structures of the second hollow motor, the second feed screw, the second nut, and the second bearing portion are the same as those of the first pressure unit.
Therefore, it is possible to suppress an increase in the total length of the thrust generation direction (axial direction) of the pressurizing device by devising the structure in the first pressurizing unit and the second pressurizing unit.

Furthermore, in the pressurizing device of the present invention, the second feed screw is coupled to the second pressurizing portion in a state of being inserted and disposed in the screw shaft through-hole in the first feed screw, and the center of the second hollow motor The axis and the central axis of the first hollow motor are arranged on the same line.
Thereby, the action center of the thrust of both the first feed screw and the second feed screw can be matched with a virtual straight line passing through the center axis of the first hollow motor and the center axis of the second hollow motor.

  When the work is arranged around the imaginary straight line and pressure is applied by each pressurizing unit, the center of action of the thrust when the work is pressurized by each pressurizing unit can be matched. It is possible to prevent an eccentric load from being applied. Therefore, it is possible to improve the processing accuracy of the workpiece by pressurizing each pressurizing unit.

  Also, by placing the work around the virtual straight line and applying pressure by each pressurizing unit, it is possible to prevent an eccentric load as a reaction force due to the pressurization from being applied in the pressurizing device. Can do. Therefore, it is not necessary to ensure the rigidity of the pressure device on the assumption that it receives an eccentric load, and the pressure device can be reduced in size.

  Therefore, according to the pressurizing apparatus of the present invention, it is possible to improve the processing accuracy of the workpiece by pressurization, to prevent an eccentric load from being applied in the apparatus, and to reduce the size of the apparatus.

A second invention is a pressurization apparatus comprising a first pressurization unit and a second pressurization unit,
The first pressure unit includes a first hollow motor having a first hollow hole in the first rotor;
A first base portion provided with a first stator in the first hollow motor;
A first nut that includes a first female thread portion and rotates integrally with the first rotor in a state of being coupled to the first rotor;
A first feed screw that includes a first male thread portion that is screwed into the first female thread portion, and that advances and retreats in the first hollow hole as the first nut rotates;
A first pressure member disposed at the tip of the first feed screw;
A first guide part disposed on the first base part for guiding the advancement and retraction of the first pressurizing part in a state where the first pressurizing part is prevented from rotating;
A first bearing portion disposed on an outer peripheral side of the first nut and receiving a thrust load applied in an axial direction of the first feed screw;
The first feed screw has a screw shaft through hole formed through the shaft, and has the same outer diameter over the entire length except for an end attached to the first pressure member. It consists of one member,
The second pressure unit includes a second hollow motor provided with a second hollow hole in the second rotor;
A second base portion fixed to the first base portion and provided with a second stator in the second hollow motor;
A second nut that includes a second female thread portion and rotates integrally with the second rotor in a state of being coupled to the second rotor;
A second feed screw that includes a second male thread portion that is screwed into the second female thread portion, and that advances and retreats in the second hollow hole and in the screw shaft through-hole as the second nut rotates.
A second pressure member disposed at the tip of the second feed screw;
A second guide part disposed on the second base part for guiding the advancement and retraction of the second pressure part in a state where the rotation of the second pressure part is performed;
A second bearing portion disposed on an outer peripheral side of the second nut and receiving a thrust load applied in an axial direction of the second feed screw;
The second feed screw is composed of one member formed with the same outer diameter over the entire length except for an end attached to the second pressure part,
A through hole is formed in the tip side surface of the first pressurizing portion, and an annular first punch is disposed around the axis of the first feed screw,
A second punch is disposed on the tip side surface of the second pressurizing portion with the shaft center of the second feed screw as the center, and the second punch is disposed in the screw shaft through hole and in the through hole. In the state of being inserted through, the tip portion is arranged on the inner peripheral side of the first punch,
A central axis of the central axis and said first hollow motor of the second hollow motor is a pressurized device which is characterized in that arranged on the same line (Claim 2).

The pressure device according to the present invention is configured such that a first punch and a second punch are disposed in the first pressure portion and the second pressure portion, respectively, and pressure is applied by each punch.
In the pressurizing device of the present invention, the second punch is inserted and arranged in the screw shaft through-hole in the first feed screw and in the through-hole in the first pressurizing portion, and the tip thereof is the inner periphery of the first punch. The central axis of the second hollow motor and the central axis of the first hollow motor are arranged on the same line.
Thereby, the action center of the thrust of both the first feed screw and the second feed screw can be matched with a virtual straight line passing through the center axis of the first hollow motor and the center axis of the second hollow motor.

  The annular first punch is arranged around the axis of the first feed screw, and the second punch is arranged around the axis of the second feed screw. Then, when the workpiece is arranged at a position facing the first punch and the second punch with the virtual straight line as the center, and the pressurization is performed by each punch, the thrust of the pressurization of the workpiece by each punch is The center of action can be matched, and an eccentric load can be prevented from being applied to the workpiece. For this reason, it is possible to improve the processing accuracy of the workpiece by pressurizing each punch.

In addition, by placing a work at a position facing the first punch and the second punch around the virtual straight line and performing pressurization with each punch, an eccentric load as a reaction force due to this pressurization is obtained. It can prevent joining in a pressurization apparatus. Therefore, it is not necessary to ensure the rigidity of the pressure device on the assumption that it receives an eccentric load, and the pressure device can be reduced in size.
In addition, the operational effects of the pressurizing apparatus of the present invention are the same as those of the first invention.

  Therefore, even with the pressurizing apparatus of the present invention, the processing accuracy of the workpiece by pressurization can be improved, and an eccentric load can be prevented from being applied in the apparatus, and the apparatus can be miniaturized.

The reference invention is a pressurizing device including a first pressurizing unit and a second pressurizing unit,
The first pressure unit includes a hollow motor provided with a hollow hole in the rotor;
A base portion provided with a stator in the hollow motor;
A nut that includes a female thread portion and rotates integrally with the rotor in a state of being coupled to the rotor;
A feed screw that includes a male screw portion that is screwed into the female screw portion, and advances and retreats in the hollow hole as the nut rotates;
A first pressure member disposed at the tip of the feed screw;
A guide portion that is disposed on the base portion and guides the advancement and retraction of the first pressure member in a state where the first pressure member is prevented from rotating
A bearing portion disposed on an outer peripheral side of the nut and receiving a thrust load applied in an axial direction of the feed screw;
The feed screw includes a screw shaft through hole formed through the shaft,
The second pressurizing unit includes a pressurizing shaft inserted and disposed in the screw shaft through hole,
A second pressure member disposed at the tip of the pressure shaft;
A thrust generating source for applying thrust in the axial direction of the pressure shaft,
The pressurizing shaft is connected to the second pressurizing part, the tip part of which is arranged on the tip side of the first pressurizing part in a state where the pressurizing shaft is inserted and arranged in the screw shaft through-hole.
The pressurizing apparatus is characterized in that the axis of the pressurizing shaft and the central axis of the hollow motor are arranged on the same line .

  In the pressurizing device of the present invention, the first pressurizing unit is configured to perform pressurization from the first pressurizing unit by converting the rotational force of the hollow motor into thrust in the axial direction by the feed screw and the nut. The second pressurizing unit is configured to pressurize from the second pressurizing unit using a thrust generating source such as a cylinder.

The operation of the first pressure unit of the present invention is the same as the operation of the first pressure unit in the first invention. Moreover, the 2nd pressurization unit of this invention can pressurize with respect to a workpiece | work by a 2nd pressurization part via a pressurization shaft by operating a thrust generation source.
Further, in the first pressure unit, a thrust load applied in the axial direction of the feed screw by a reaction force generated when pressure is applied by the first pressure unit can be received by the bearing unit. Therefore, it can prevent that the reaction force by a 1st pressurizing part is directly added to the rotor of a hollow motor.

Further, in the first pressure unit, the hollow motor rotor has a hollow hole, and the feed screw can be disposed in a state where a part of the feed screw is disposed in the hollow hole of the rotor. Further, the nut is coupled to the rotor without passing through a speed reducer such as a gear or a pulley, and the space for disposing the speed reducer between the hollow motor and the nut can be eliminated. Further, the bearing portion is disposed on the outer peripheral side of the nut.
Therefore, it is possible to suppress an increase in the overall length in the thrust generation direction (axial direction) of the pressurizing device by devising the structure in the first pressurizing unit.

Furthermore, in the pressurizing device of the present invention, the pressurizing shaft is coupled to the second pressurizing portion in a state where the pressurizing shaft is inserted into the screw shaft through hole in the feed screw. Are arranged on the same line.
Thereby, the action center of the thrust of both the feed screw and the pressure shaft can be matched with a virtual straight line passing through the center axis of the hollow motor and the thrust generation center of the thrust generation source.

  When the work is arranged around the imaginary straight line and pressure is applied by each pressurizing unit, the center of action of the thrust when the work is pressurized by each pressurizing unit can be matched. It is possible to prevent an eccentric load from being applied. Therefore, it is possible to improve the processing accuracy of the workpiece by pressurizing each pressurizing unit.

  Also, by placing the work around the virtual straight line and applying pressure by each pressurizing unit, it is possible to prevent an eccentric load as a reaction force due to the pressurization from being applied in the pressurizing device. Can do. Therefore, it is not necessary to ensure the rigidity of the pressure device on the assumption that it receives an eccentric load, and the pressure device can be reduced in size.

  Therefore, even with the pressurizing apparatus of the present invention, the processing accuracy of the workpiece by pressurization can be improved, and an eccentric load can be prevented from being applied in the apparatus, and the apparatus can be miniaturized.

A preferred embodiment in the first and second inventions described above will be described.
In the first and second aspects of the invention, the pressurizing device can pressurize the workpiece in multiple stages by operating the first pressurizing unit and the second pressurizing unit separately.
The pressurizing device operates the first pressurizing unit and the second pressurizing unit at the same time to pressurize the work by the second pressurizing unit, and the second pressurizing unit by the first pressurizing unit. It is also possible to pressurize the workpiece by superimposing the pressure applied by the first hollow motor and the pressure applied by the second hollow motor.

Further, only the second hollow motor is operated to press the first stage of pressure on the workpiece from the second pressurizing unit, while the first hollow motor and the second hollow motor are simultaneously operated to operate the second pressurizing unit. And pressurizing the workpiece from the first and pressurizing the second pressurizing unit by the first pressurizing unit, thereby applying a second pressurization to the work that is larger than the first pressurizing force. You can also.
In the first aspect of the invention, the first pressurizing part is moved forward in the direction away from the first hollow motor, and the second pressurizing part is moved backward in the direction approaching the second hollow motor. It is also possible to pressurize the work placed between the pressure part and the second pressure part from both sides.

Moreover, the said pressurization apparatus can perform various pressurization, such as press-fit, powder shaping | molding (powder compression molding), a bending process, or a compression process, with respect to a workpiece | work.
In the first and second inventions, the first guide part and the second guide part may be configured by the same guide member disposed along the thrust generation direction of the pressurizing device.

In the first and second inventions, the first bearing portion may be a sliding thrust bearing disposed on the surface of the first nut in the thrust generation direction. Further, the first bearing portion may be a rolling thrust bearing having reduced rotational resistance by using rolling by a plurality of balls or rollers (cylindrical rollers or tapered rollers). Similarly, the second bearing portion can be a sliding thrust bearing or a rolling thrust bearing.
Similarly, the bearing portion in the above reference invention can be a sliding thrust bearing or a rolling thrust bearing.

  Moreover, the said pressurization apparatus can also comprise 3 or more pressurization units. For example, when the pressurizing device includes three pressurizing units, a second screw shaft through hole is formed in the second feed screw in the second pressurizing unit, and a third feed in the third pressurizing unit is formed. A screw can be inserted and arranged in the second screw shaft through-hole, and the central axes of the first to third hollow motors can be arranged on the same line.

In the first aspect of the invention, a through hole is formed in the tip side surface of the second pressure member, and a second punch is disposed around the axis of the second feed screw. A first punch is disposed on the front end side surface of the first pressurizing portion around the axis of the first feed screw, and the first punch is coupled to the first pressurizing portion through the through hole. It is.
As a result , when the workpiece is arranged at a position facing the first punch and the second punch and the pressure is applied by each punch, the center of action of the thrust when the workpiece is pressed by each punch can be matched. It is possible to prevent an eccentric load from being applied to the workpiece.

The cross-sectional shapes of the first punch and the second punch can be various shapes.
For example, the first punch can be formed in a hollow cross-sectional shape, and the second punch can be formed in a solid cross-sectional shape arranged on the inner peripheral side of the first punch (see FIG. 7). Alternatively, the first punch may be formed in a solid cross-sectional shape, and the second punch may be formed in a hollow cross-sectional shape arranged on the outer peripheral side of the first punch (see FIG. 9). Alternatively, the first punch may be formed in a hollow cross-sectional shape, and the second punch may be formed in a hollow cross-sectional shape arranged on the outer peripheral side of the first punch (see FIG. 10).

In the first and second inventions, a plurality of the first guide portions are disposed around the first feed screw, and a plurality of the second guide portions are disposed around the second feed screw. The first feed screw and the second feed screw are centroids with respect to the arrangement positions of the plurality of first guide portions and the plurality of second guide portions in a cross section orthogonal to the thrust generation direction of the pressurizing device. It is preferable to arrange at a position (Claim 3 ).

  In this case, the advancement / retraction of the first pressurizing part can be stably guided by the plurality of first guide parts, and the advancement / retraction of the second pressurizing part can be stably guided by the plurality of second guide parts. Can do. Further, the thrust action center in the first pressurizing part and the thrust action center in the second pressurizing part can be matched with the centroid position with respect to the arrangement positions of the plurality of first guide parts and the plurality of second guide parts. . Therefore, it can prevent more effectively that an eccentric load is added in a pressurization apparatus.

In the reference invention, a plurality of the guide portions are disposed around the feed screw, and the feed screw and the pressure shaft are arranged in a cross section perpendicular to the thrust generation direction of the pressure device. It is preferable to dispose at the centroid position with respect to the disposition position of the guide portion .
In this case, the advance and retreat of the first pressurizing part can be stably guided by the plurality of guide parts. Further, the thrust action center in the first pressurizing part and the thrust action center in the second pressurizing part can be matched with the centroid position with respect to the arrangement positions of the plurality of guide parts. Therefore, it can prevent more effectively that an eccentric load is added in a pressurization apparatus.

In the first and second aspects of the invention, the first bearing portion is a rolling bearing that receives the thrust load and a radial load due to the rotation of the first nut, and the second bearing portion is the thrust bearing. it is preferable that the rolling bearing for receiving a radial load due to the rotation of the second nut along with receiving a load (claim 4).
In this case, the rotation of each nut can be maintained by each rolling bearing, and the rotational resistance generated when each nut rotates can be reduced.

In the above reference invention, it is preferable that the bearing portion is a rolling bearing that receives the thrust load and the radial load due to the rotation of the nut .
In this case, the rotation of the nut can be maintained by the rolling bearing, and the rotational resistance generated during the rotation of the nut can be reduced.

In the first , second and reference inventions, the rolling bearing has a predetermined contact angle with respect to the radial direction (for example, a line connecting the balls and the contact surfaces of the inner ring and the outer ring). Angular contact ball bearings having a contact angle of 20 to 40 ° can be used. In addition, as the rolling bearing, a roller bearing using a cylindrical or conical roller instead of the ball can be used. Moreover, each said bearing part can be comprised by arrange | positioning several rolling bearings in parallel.

In the first and second aspects of the invention, the first bearing portion also serves as a bearing for the first rotor that holds the rotation of the first rotor, and the second bearing portion is a portion of the second rotor. It is preferable to use also the bearing for 2nd rotor which hold | maintains rotation (Claim 5 ).
In this case, each bearing portion can also serve as a rotor bearing that holds the rotation of each rotor, and the pressure device can be further miniaturized by reducing the number of parts.

In the above reference invention, it is preferable that the bearing portion also serves as a rotor bearing that holds the rotation of the rotor .
In this case, the bearing portion can also serve as a rotor bearing that holds the rotation of the rotor, and the number of parts can be reduced and the pressure device can be further miniaturized.

Hereinafter, embodiments of the pressurizing apparatus according to the present invention will be described with reference to the drawings.
Example 1
The pressurization apparatus 1 of this example is provided with the 1st pressurization unit 11 and the 2nd pressurization unit 12, as shown in FIGS. 1-5, The electric pressurization apparatus (electric type) by two pressurization units Press) 1 is formed.
The first pressurizing unit 11 includes the following first hollow motor 3A, first base portion 2A, first nut 42A, first feed screw 41A, first pressurizing portion 5A, first guide portion 6A, and first bearing portion. 7A.

  As shown in FIG. 3, the first hollow motor 3A is formed by forming a first hollow hole 321A inside a first rotor 32A that rotates with respect to the first stator 31A. The first base portion 2A is provided with the first stator 31A in the first hollow motor 3A. The first nut 42A includes a first female thread portion 421A and is directly coupled to the first rotor 32A. The first nut 42A is configured to rotate integrally with the first rotor 32A.

As shown in the figure, the first feed screw 41A includes a first male screw portion 411A that is screwed into the first female screw portion 421A, and the first hollow hole 321A is accompanied with the rotation of the first nut 42A. It is configured to move forward and backward. The first pressurizing unit 5A is disposed at the tip of the first feed screw 41A. The first guide portion 6A is disposed on the first base portion 2A, and is configured to guide the advance and retreat of the first pressurizing portion 5A in a state where the first pressurizing portion 5A is prevented from rotating. The first bearing portion 7A is disposed on the outer peripheral side of the first nut 42A, and is configured to receive a thrust load applied in the axial direction L of the first feed screw 41A.
The first feed screw 41A includes a screw shaft through hole 412 formed through the shaft.

The second pressure unit 12 includes the following second hollow motor 3B, second base portion 2B, second nut 42B, second feed screw 41B, second pressure portion 5B, second guide portion 6B, and second bearing portion. 7B.
As shown in FIG. 4, the second hollow motor 3B is formed by forming a second hollow hole 321B inside a second rotor 32B that rotates relative to the second stator 31B. The second base portion 2B is fixed to the first base portion 2A and is provided with a second stator 31B in the second hollow motor 3B. The second nut 42B includes a second female thread portion 421B and is directly coupled to the second rotor 32B. The second nut 42B is configured to rotate integrally with the second rotor 32B.

  Further, as shown in FIG. 4, the second feed screw 41B includes a second male screw portion 411B that is screwed into the second female screw portion 421B. The inside and the inside of the screw shaft through hole 412 in the first feed screw 41A are configured to advance and retreat. The 2nd pressurizing part 5B is arrange | positioned at the front-end | tip part of the 2nd feed screw 41B. The second guide portion 6B is disposed on the second base portion 2B, and is configured to guide the advancement / retraction of the second pressure portion 5B in a state where the rotation of the second pressure portion 5B is performed. The second bearing portion 7B is disposed on the outer peripheral side of the second nut 42B and is configured to receive a thrust load applied in the axial direction L of the second feed screw 41B.

  As shown in FIGS. 1 and 2, the second feed screw 41B is inserted and arranged in the screw shaft through hole 412 of the first feed screw 41A, and the tip portion thereof is on the tip side of the first pressurizing portion 5A. It couple | bonds with the 2nd pressurization part 5B arrange | positioned. And the pressurization apparatus 1 arrange | positions the center axis line of the 2nd hollow motor 3B, and the center axis line of the 1st hollow motor 3A on the same line.

In addition, the pressurizing apparatus 1 of this example is configured with the thrust generation direction L oriented in the vertical direction, and the feed screws 41A, B and the pressurizing units 5A, B in this example are oriented in the vertical direction. Advance and retreat.
FIG. 1 shows the pressurizing device 1 in which the pressurizing units 5A and B are in the retracted position, and FIG. 2 shows the pressurizing device 1 in which the pressurizing units 5A and B are in the advanced position. Yes. FIG. 3 shows the first pressure unit 11, and FIG. 4 shows the second pressure unit 12.

Below, it demonstrates in full detail with FIGS. 1-5 about the pressurization apparatus 1 of this example.
As shown in FIG. 3, in the 1st pressurization unit 11, the 1st feed screw 41A and the 1st nut 42A are the 1st external thread part 411A of the 1st feed screw 41A, and the 1st internal thread part 421A of the 1st nut 42A. A plurality of balls are arranged between the first feed screw 41 </ b> A and the first nut 42 </ b> A via the plurality of balls.
Further, as shown in FIG. 4, the second feed screw 41 </ b> B and the second nut 42 </ b> B are similarly configured using ball screws in the second pressure unit 12.

  The hollow motors 3A and B are servo motors that can control the positions of the pressure units 5A and 5B. Each hollow motor 3A, B is provided with an encoder for detecting the position, a brake for braking each rotor 32A, B, and the like.

  As shown in FIG. 3, in the first hollow motor 3A of the first pressure unit 11, the first stator 31A is accommodated in the first housing 33A, and the first rotor 32A is on the inner peripheral side of the first stator 31A. Is rotatably arranged. The first housing 33A for housing the first stator 31A is fixed to the first base portion 2A via a first outer bracket 34A fixed to the first base portion 2A. A first inner bracket 35A is disposed on the outer peripheral side of the first nut 42A coupled to the first rotor 32A, and the first inner bracket 35A is coupled to the first rotor 32A and the first nut 42A. is there.

  The first bearing portion 7A is disposed between the first outer bracket 34A and the first inner bracket 35A. The first rotor 32A, the first nut 42A, and the first inner bracket 35A are configured to rotate with respect to the first stator 31A, the first housing 33A, and the first outer bracket 34A by the first bearing portion 7A. is there.

  As shown in FIG. 4, in the second hollow motor 3B of the second pressure unit 12, the second stator 31B is housed in the second housing 33B, and the second rotor 32B is connected to the second stator 31B. It is rotatably arranged on the inner peripheral side. The second housing 33B that accommodates the second stator 31B is fixed to the second base portion 2B via a second outer bracket 34B that is fixed to the second base portion 2B. A second inner bracket 35B is disposed on the outer peripheral side of the second nut 42B coupled to the second rotor 32B, and the second inner bracket 35B is coupled to the second rotor 32B and the second nut 42B. is there.

  The second bearing portion 7B is disposed between the second outer bracket 34B and the second inner bracket 35B. The second rotor 32B, the second nut 42B, and the second inner bracket 35B are configured to rotate with respect to the second stator 31B, the second housing 33B, and the second outer bracket 34B by the second bearing portion 7B. is there.

As shown in FIGS. 3 and 4, in the first pressure unit 11 and the second pressure unit 12, the bearings 7 </ b> A and 7 </ b> B are rolling that receives a thrust load and a radial load due to the rotation of the nuts 42 </ b> A and B. Angular contact ball bearings were used. This angular ball bearing is composed of an inner ring portion, an outer ring portion disposed on the outer peripheral side thereof, and a plurality of balls disposed therebetween. And each bearing part 7A, B of this example comprised the angular ball bearing in multiple numbers (three in this example) arranged in parallel.
Moreover, each bearing part 7A, B of this example also serves as the role of the lower rotor bearing located on the lower side of the rotor in each hollow motor 3A, B. Further, upper rotor bearings 71A and 71B are disposed between the upper ends of the rotors 32A and 32B and the respective housings 33A and 33B.

As shown in FIGS. 1 and 2, in the first pressure unit 11 and the second pressure unit 12, the first guide portion 6 </ b> A and the second guide portion 6 </ b> B are along the thrust generation direction L of the pressure device 1. The same guide shaft 22 is provided.
As shown in FIG. 5, a plurality of guide shafts 22 are arranged around the first feed screw 41A and the second feed screw 41B, and the first feed screw 41A and the second feed screw 41B are arranged in the thrust generation direction L. In the cross section orthogonal to each other, they are arranged at the centroid position (center position) with respect to the arrangement positions of the plurality of guide shafts 22.

As shown in FIGS. 1 and 2, the second base portion 2 </ b> B is fixed to the first base portion 2 </ b> A by a plurality of standing pillars 23 disposed on the first base portion 2 </ b> A. The plurality of guide shafts 22 are erected from the main base portion 21 that arranges workpieces and the like, and the first base portion 2A is fixed to the main base portion 21 by the plurality of guide shafts 22.
Each of the pressurizing parts 5A and B is provided with a plurality of bushes 55A and B (ball bushes in this example) through which the guide shafts 22 are inserted and slid. In the state where the rotation is stopped by the plurality of guide shafts 22, they are configured to advance and retreat.

In this example, as shown in FIG. 3, the first hollow hole 321A formed in the first rotor 32A is formed so as to penetrate the first rotor 32A, and the first feed screw 41A is the first hollow hole 321A. It is inserted through. Further, as shown in FIG. 4, the second hollow hole 321B formed in the second rotor 32B is formed to penetrate the second rotor 32B, and the first feed screw 41A and the second feed screw 41B are the second It is inserted and arranged in the hollow hole 321B.
The second hollow hole 321B does not necessarily have to be formed through the second rotor 32B as long as a space for arranging the second feed screw 41B can be secured.

Next, operation | movement and effect of the said pressurization apparatus 1 are demonstrated.
As shown in FIGS. 1 and 2, when the first pressure unit 11 is operated, the first stator 31A of the first hollow motor 3A is energized, and the first rotor 32A of the first hollow motor 3A is moved. Rotate. At this time, the first nut 42A rotates together with the rotation of the first rotor 32A, and the rotational force of the first nut 42A is caused by the first female screw portion 421A and the first male screw portion 411A to be screwed together, whereby the first feed screw 41A. Is converted into a thrust that advances and retreats in the axial direction L.

The first feed screw 41A and the first pressurizing unit 5A advance and retreat in a state in which the first guide screw 6A and the first pressurizing unit 5A are guided by the first guide unit 6A, and the first pressurizing unit 5A adds to the workpiece. Pressure can be performed.
Also, when operating the second pressure unit 12, the operations of the second hollow motor 3B, the second nut 42B, the second feed screw 41B, the second guide portion 6B, and the second pressure portion 5B are as follows: The operation is the same as that of the first pressure unit 11, and the work can be pressurized by the second pressure unit 5B.

Further, in the first pressurizing unit 11, a thrust load applied in the axial direction L of the first feed screw 41A due to a reaction force generated when pressurization is performed by the first pressurizing unit 5A is received by the first bearing unit 7A. be able to. Therefore, it is possible to prevent the reaction force from the first pressurizing unit 5A from being directly applied to the first rotor 32A.
Similarly, in the second pressure unit 12, the thrust load applied in the axial direction L of the second feed screw 41B by the reaction force generated when pressure is applied by the second pressure unit 5B is the second bearing unit. Can be received by 7B. Therefore, it is possible to prevent the reaction force from the second pressure unit 5B from being directly applied to the second rotor 32B.

  In the first pressurizing unit 11, the first rotor 32A of the first hollow motor 3A is provided with a first hollow hole 321A, and the first feed screw 41A is partially disposed in the first rotor 32A. It can carry out in the state arrange | positioned in the 1st hollow hole 321A. Further, the first nut 42A is coupled to the first rotor 32A without passing through a reduction gear such as a gear or a pulley, and a reduction gear installation space between the first hollow motor 3A and the first nut 42A. Can be eliminated. Further, the first bearing portion 7A is disposed on the outer peripheral side of the first nut 42A.

Also in the second pressure unit 12, the structures of the second hollow motor 3 </ b> B, the second feed screw 41 </ b> B, the second nut 42 </ b> B, and the second bearing portion 7 </ b> B are the same as those of the first pressure unit 11.
Therefore, the total length of the thrust generation direction (axial direction) L of the pressurizing device 1 can be suppressed by improving the structure of the first pressurizing unit 11 and the second pressurizing unit 12.

Furthermore, in the pressurizing apparatus 1 of the present example, the second feed screw 41B is coupled to the second pressurizing unit 5B in a state of being inserted and disposed in the screw shaft through hole 412 in the first feed screw 41A. The central axis of the second hollow motor 3B and the central axis of the first hollow motor 3A are arranged on the same line.
As a result, the center of action of the thrust of both the first feed screw 41A and the second feed screw 41B can be matched with an imaginary straight line passing through the center axis of the first hollow motor 3A and the center axis of the second hollow motor 3B. .

  When the work is arranged around the imaginary straight line and the pressure is applied by the pressurizing units 5A and 5B, the center of action of the thrust when the work is pressurized by the pressurizing units 5A and B is set. Therefore, it is possible to prevent an eccentric load from being applied to the workpiece. Therefore, it is possible to improve the work accuracy of the workpiece by pressurizing each of the pressurizing units 5A and B.

Further, as shown in FIG. 5, each of the feed screws 41 </ b> A and 41 </ b> B has a centroid position (center position) with respect to the arrangement positions of the plurality of guide shafts 22 in a cross section orthogonal to the thrust generation direction L of the pressurizing device 1. ). Therefore, the thrust action center in the first pressurizing part 5A and the thrust action center in the second pressurizing part 5B can be matched with the centroid position with respect to the arrangement positions of the plurality of guide shafts 22.
Then, by placing the work around the virtual straight line where the feed screws 41A and 41B are arranged, and pressurizing by the pressurizing portions 5A and 5B, the eccentric load as a reaction force due to the pressurization. However, it can prevent that it adds in the pressurization apparatus 1. FIG. Therefore, it is not necessary to ensure the rigidity of the pressure device 1 on the assumption that it receives an eccentric load, and the pressure device 1 can be reduced in size.

  Therefore, according to the pressurizing device 1 of the present example, it is possible to improve the processing accuracy of the workpiece by pressurization, to prevent an eccentric load from being applied in the device, and to reduce the size of the device.

(Example 2)
In this example, as shown in FIG. 6, the second pressurizing unit 120 does not use the second hollow motor 3B, but the following pressurizing shaft 81, thrust generating source 82, second base portion 2B, second pressurizing portion. The example of the pressurization apparatus 10 comprised using 5B and the 2nd guide part 6B is shown.
As shown in the figure, the pressurizing shaft 81 is inserted into the screw shaft through hole 412, and the second pressurizing part 5 </ b> B is disposed at the tip of the pressurizing shaft 81. The thrust generation source 82 is a hydraulic cylinder 82 and is configured to apply thrust in the axial direction L of the pressure shaft 81. The pressure shaft 81 is coupled to the pressure rod 821 in the hydraulic cylinder 82.

The second base portion 2B is fixed to the first base portion 2A via the plurality of standing posts 23, and the hydraulic cylinder 82 is fixed to the second base portion 2B. Similar to the first embodiment, a plurality of second guide portions 6B are arranged on the second base portion 2B.
Further, the first guide portion 6A and the second guide portion 6B of this example are configured by the guide shaft 22 as in the first embodiment.

Further, the pressurizing shaft 81 is coupled to the second pressurizing unit 5B disposed at the distal end side of the first pressurizing unit 5A in a state where the pressurizing shaft 81 is inserted into the screw shaft through-hole 412. . And the pressurization apparatus 10 of this example arrange | positions the axial center of the pressurization shaft 81, and the center axis line of the 1st hollow motor 3A on the same line. And the 2nd pressurization unit 120 of this example can pressurize with respect to a workpiece | work by the 2nd pressurization part 5B via the pressurization shaft 81 by operating the thrust generation source 82. FIG.
Also in this example, other configurations are the same as those of the first embodiment, and the same effects as those of the first embodiment can be obtained.

(Example 3)
In this example, as shown in FIGS. 7 and 8, the pressing device 100 is configured by arranging the punches 51 </ b> A and 51 B in the pressing portions 5 </ b> A and B shown in the first embodiment.
That is, as shown in FIG. 7, a through hole 52B is formed in the tip side surface of the second pressure member 5B of this example, and the second punch 51B is formed around the axis of the second feed screw 41B. It is arranged. A first punch 51A is disposed on the tip side surface of the first pressurizing portion 5A of the present example, centering on the axis of the first feed screw 41A. The first punch 51A is coupled to the first pressure unit 5A through the through hole 52B.

  As shown in FIGS. 7 and 8, the through hole 52B of this example is formed around the coupling position of the second feed screw 41B in the second pressurizing portion 5B. A plurality of the through holes 52B are formed around the coupling position of the second feed screw 41B. The first punch 51A is coupled to the first pressure unit 5A by a connecting member 53A inserted and disposed in the through hole 52B. Each through hole 52B is formed at the same distance from the axial center position of the second feed screw 41B.

8 shows a state in which the punches 51A and 51B, the through holes 52B, and the connecting member 53A are arranged as viewed from the front end side (downward) of the pressure device 100 in a cross section perpendicular to the thrust generation direction L. FIG.
In addition to the above, the through hole 52B can have various structures. For example, the through hole 52B can be formed by a single long hole penetrating in a curved or U shape.

The first punch 51A of this example has an annular cross section centered on a virtual line passing through the axis of the first feed screw 41A, and the second punch 51B is located on the inner peripheral side of the first punch 51A. It is arranged and has a circular cross section centered on an imaginary line passing through the axis of the second feed screw 41B.
In addition to this, as shown in FIG. 9, the first punch 51A is formed in a circular cross section centered on a virtual line passing through the axis of the first feed screw 41A, and the second punch 51B is formed in the first punch 51A. It is also possible to form an annular cross-section centering on an imaginary line passing through the axis of the second feed screw 41B.

  Further, as shown in FIG. 10, the first punch 51A is formed in a cross-sectional annular shape centering on an imaginary line passing through the axis of the first feed screw 41A, and the second punch 51B is formed on the outer periphery of the first punch 51A. In addition to being arranged on the side, it can also be formed in an annular cross section centered on an imaginary line passing through the axis of the second feed screw 41B. 9 and 10, the second punch 51B is coupled to the second pressure unit 5B by a connecting member 53B.

  In this example, the work can be pressed in two stages by the first punch 51A and the second punch 51B. Also in this example, other configurations are the same as those of the first embodiment, and the same effects as those of the first embodiment can be obtained.

Example 4
In this example, as shown in FIG. 11, the second pressurizing unit 5B in the second pressurizing unit 12 is arranged on the rear end side (upward) from the first pressurizing unit 11 to configure the pressurizing apparatus 100. This is an example.
A through hole 52B is formed on the tip side surface of the first pressurizing portion 5A of the present example, and an annular first punch 51A is disposed around the axis of the first feed screw 41A. In addition, a second punch 51B is disposed on the tip side surface of the second pressurizing portion 5B of the present example with the axis of the second feed screw 41B as the center. The second punch 51B is disposed in the screw shaft through hole 412 of the first feed screw 41A and in the through hole 52B, and the tip thereof is disposed on the inner peripheral side of the first punch 51A. .

The first punch 51A in this example has an annular cross section centered on a virtual line passing through the axis of the first feed screw 41A, and the second punch 51B in this example is an inner part of the first punch 51A. It has a cross-sectional circular shape centered on an imaginary line that is arranged on the circumferential side and passes through the axis of the second feed screw 41B.
The first pressurizing unit 5A is provided with a steadying member 54A for guiding the slide of the second punch 51B in the axial direction L.

  In this example, the work can be pressed in two stages by the first punch 51A and the second punch 51B. Also in this example, other configurations are the same as those of the first embodiment, and the same effects as those of the first embodiment can be obtained.

Sectional explanatory drawing which shows the pressurization apparatus in Example 1 in which each pressurization part exists in a retreat position. Sectional explanatory drawing which shows the pressurization apparatus in which each pressurization part in an Example 1 exists in an advance position. Sectional explanatory drawing which expands and shows the 1st pressurization unit in the pressurization apparatus in Example 1. FIG. Sectional explanatory drawing which expands and shows the 2nd pressurization unit in the pressurization apparatus in Example 1. FIG. Plane explanatory drawing which shows the arrangement | positioning state of each feed screw and guide shaft in Example 1 in the cross section orthogonal to a thrust generation direction. Sectional explanatory drawing which shows the pressurization apparatus in Example 2. FIG. Sectional explanatory drawing which shows the pressurization apparatus in Example 3. FIG. FIG. 9 is an explanatory plan view showing the arrangement state of each punch, through hole, and connecting member in a cross section orthogonal to a thrust generation direction L in Example 3. Sectional explanatory drawing which shows the other pressurization apparatus in Example 3. FIG. Sectional explanatory drawing which shows the other pressurization apparatus in Example 3. FIG. Sectional explanatory drawing which shows the pressurization apparatus in Example 4. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressurization apparatus 11 1st pressurization unit 12 2nd pressurization unit 2A, B 1st, 2nd base part 22 Guide shaft 3A, B 1st, 2nd hollow motor 31A, B 1st, 2nd stator 32A, B 1st, 2nd rotor 321A, B 1st, 2nd hollow hole 41A, B 1st, 2nd feed screw 411A, B 1st, 2nd external thread part 412 Screw shaft center through-hole 42A, B 1st, 2nd nut 421A, B 1st, 2nd female thread part 5A, B 1st, 2nd pressurizing part 51A, B 1st, 2nd punch 6A, B 1st, 2nd guide part 7A, B 1st, Second bearing portion 81 Pressurizing shaft 82 Thrust generating source L Thrust generating direction (axial direction)

Claims (5)

A pressurization device comprising a first pressurization unit and a second pressurization unit,
The first pressure unit includes a first hollow motor having a first hollow hole in the first rotor;
A first base portion provided with a first stator in the first hollow motor;
A first nut that includes a first female thread portion and rotates integrally with the first rotor in a state of being coupled to the first rotor;
A first feed screw that includes a first male thread portion that is screwed into the first female thread portion, and that advances and retreats in the first hollow hole as the first nut rotates;
A first pressure member disposed at the tip of the first feed screw;
A first guide part disposed on the first base part for guiding the advancement and retraction of the first pressurizing part in a state where the first pressurizing part is prevented from rotating;
A first bearing portion disposed on an outer peripheral side of the first nut and receiving a thrust load applied in an axial direction of the first feed screw;
The first feed screw has a screw shaft through hole formed through the shaft, and has the same outer diameter over the entire length except for an end attached to the first pressure member. It consists of one member,
The second pressure unit includes a second hollow motor provided with a second hollow hole in the second rotor;
A second base portion fixed to the first base portion and provided with a second stator in the second hollow motor;
A second nut that includes a second female thread portion and rotates integrally with the second rotor in a state of being coupled to the second rotor;
A second feed screw that includes a second male thread portion that is screwed into the second female thread portion, and that advances and retreats in the second hollow hole and in the screw shaft through-hole as the second nut rotates.
A second pressure member disposed at the tip of the second feed screw;
A second guide part disposed on the second base part for guiding the advancement and retraction of the second pressure part in a state where the rotation of the second pressure part is performed;
A second bearing portion disposed on an outer peripheral side of the second nut and receiving a thrust load applied in an axial direction of the second feed screw;
The second feed screw, while placed through to the screw axis through the mouth, Ru that the tip is coupled to the second pressure which is disposed on the distal end side than the first pressing tare And a single member formed with the same outer diameter over the entire length except for the end attached to the second pressure part,
A through hole is formed in the tip side surface of the second pressurizing part, and a second punch is disposed around the axis of the second feed screw,
A first punch is disposed on the tip side surface of the first pressurizing portion with the shaft center of the first feed screw as the center, and the first punch is inserted into the first pressurizing hole through the through hole. Connected to the pressure part,
A pressurizing device, wherein the central axis of the second hollow motor and the central axis of the first hollow motor are arranged on the same line. A pressurization device comprising a first pressurization unit and a second pressurization unit,
The first pressure unit includes a first hollow motor having a first hollow hole in the first rotor;
A first base portion provided with a first stator in the first hollow motor;
A first nut that includes a first female thread portion and rotates integrally with the first rotor in a state of being coupled to the first rotor;
A first feed screw that includes a first male thread portion that is screwed into the first female thread portion, and that advances and retreats in the first hollow hole as the first nut rotates;
A first pressure member disposed at the tip of the first feed screw;
A first guide part disposed on the first base part for guiding the advancement and retraction of the first pressurizing part in a state where the first pressurizing part is prevented from rotating;
A first bearing portion disposed on an outer peripheral side of the first nut and receiving a thrust load applied in an axial direction of the first feed screw;
The first feed screw has a screw shaft through hole formed through the shaft, and has the same outer diameter over the entire length except for an end attached to the first pressure member. It consists of one member,
The second pressure unit includes a second hollow motor provided with a second hollow hole in the second rotor;
A second base portion fixed to the first base portion and provided with a second stator in the second hollow motor;
A second nut that includes a second female thread portion and rotates integrally with the second rotor in a state of being coupled to the second rotor;
A second feed screw that includes a second male thread portion that is screwed into the second female thread portion, and that advances and retreats in the second hollow hole and in the screw shaft through-hole as the second nut rotates.
A second pressure member disposed at the tip of the second feed screw;
A second guide part disposed on the second base part for guiding the advancement and retraction of the second pressure part in a state where the rotation of the second pressure part is performed;
A second bearing portion disposed on an outer peripheral side of the second nut and receiving a thrust load applied in an axial direction of the second feed screw;
The second feed screw is composed of one member formed with the same outer diameter over the entire length except for an end attached to the second pressure part,
A through hole is formed in the tip side surface of the first pressurizing portion, and an annular first punch is disposed around the axis of the first feed screw,
A second punch is disposed on the tip side surface of the second pressurizing portion with the shaft center of the second feed screw as the center, and the second punch is disposed in the screw shaft through hole and in the through hole. In the state of being inserted through, the tip portion is arranged on the inner peripheral side of the first punch,
A pressurizing device, wherein the central axis of the second hollow motor and the central axis of the first hollow motor are arranged on the same line. In Claim 1 or 2 , a plurality of the first guide portions are arranged around the first feed screw, and a plurality of the second guide portions are arranged around the second feed screw,
The first feed screw and the second feed screw are centroid positions relative to the arrangement positions of the plurality of first guide portions and the plurality of second guide portions in a cross section orthogonal to the thrust generation direction of the pressurizing device. A pressurizing device, wherein the pressurizing device is provided. In any 1 paragraph of Claims 1-3 , The above-mentioned 1st bearing part is a rolling bearing which receives the radial load by rotation of the 1st nut while receiving the above-mentioned thrust load,
The pressurizing device, wherein the second bearing portion is a rolling bearing that receives the thrust load and also receives a radial load due to rotation of the second nut. In claim 4 , the first bearing portion also serves as a first rotor bearing that holds the rotation of the first rotor,
The pressurizing device, wherein the second bearing portion also serves as a second rotor bearing that holds the rotation of the second rotor.

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