JP2023170196A - Electric press working machine - Google Patents

Abstract

To provide an electric press working machine that is small-sized and can perform formation with high precision.SOLUTION: An electric press working machine 1 comprises: a support part 2 that supports the whole of the machine; a base 3 supported above the support part 2; three first motors 4 supported on the support part 2, below the base 3; three first ball screws 5, installed through the base 3, which are driven individually by the three first motors 4 respectively; first slides 6 installed at tips of the three first ball screws 5; three second motors 7 supported on the support part 2, below the base 3; three second ball screws 8, installed through the base 3, which are driven individually by the three second motors 7 respectively; and second slides 9 installed at tips of the three second ball screws. The first slides 6 are installed below the second slides 9. Shaft centers 5a of the three first ball screws 5 form a first isosceles triangle 5T, and shaft centers 8a of the three second ball screws 8 form a second isosceles triangle 8T.SELECTED DRAWING: Figure 4

Description

Application for application of Article 30, Paragraph 2 of the Patent Act (1) Publication via telecommunications line (website), http://www. zenformerlab. com. /news/? p=1 #1639462444-199706, February 22, 2020, (2) Published as an exhibition, 6th Ceramic Japan "Highly Functional Materials WEEK 2021", December 8, 2021

The present invention relates to an electric press machine in which a slide is raised or lowered by a plurality of drive parts.

Conventionally, there has been known a servo press device that presses a molded product by controlling a slide using a load cell that detects a press load and a rotational position sensor that detects the rotational position of a motor (Patent Document 1).

Japanese Patent Application Publication No. 2013-237062

The servo press described in Patent Document 1 sets a position corresponding to a target load to regulate the load, and if the material reaction force changes during press working, the position corresponding to the target load also changes. Therefore, it has been difficult to perform molding with high responsiveness and high precision in deep drawing molding, resin molding, etc.

An object of the present invention is to propose an electric press machine that is compact and capable of high-precision molding.

The electric press machine according to the present invention includes:
a support part that supports the whole;
a base supported above the support part;
three first motors supported by the support section below the base;
three first ball screws installed through the base and driven separately by the three first motors;
a first slide installed at the tips of the three first ball screws;
three second motors supported by the support section below the base;
three second ball screws installed through the base and driven separately by the three second motors;
a second slide installed at the tips of the three second ball screws;
Equipped with
the first slide is installed below the second slide,
The axes of the three first ball screws form a first isosceles triangle,
The axes of the three second ball screws form a second isosceles triangle.

According to the electric press processing machine according to the present invention, compact and highly accurate molding is possible.

FIG. 1 is a perspective view of an electric press machine of this embodiment. FIG. 1 is a front view of the electric press machine of this embodiment. FIG. 2 is a top view of the electric press machine of this embodiment. It is a figure showing arrangement of the axis of the 1st ball screw and the 2nd ball screw of the electric press working machine of this embodiment. FIG. 1 is a diagram showing a system configuration of an electric press machine according to the present embodiment. An example of a flowchart of the electric press machine of this embodiment is shown. The operation diagram of the electric press working machine of this embodiment is shown. The electric press processing machine of this embodiment is shown in a state in which the first slide, the second slide, and the supply port have been moved to a predetermined first position. The figure shows a state in which the supply port of the material supply section of the electric press machine of this embodiment has been moved to a predetermined second position. The first slide of the electric press machine of this embodiment is shown in a state moved to the second position. The supply port of the electric press machine of this embodiment is shown in a state moved to the first position. The first slide of the electric press machine of this embodiment is raised to the third position, and the second slide is lowered to the second position. The first slide and the second slide of the electric press machine of this embodiment are shown in a state where they have moved to a predetermined first position. It shows the state in which the workpiece of the electric press machine of this embodiment is moved.

FIG. 1 is a perspective view of the electric press machine of this embodiment, FIG. 2 is a front view of the electric press machine of this embodiment, and FIG. 3 is a top view of the electric press machine of this embodiment. Note that the material supply section 10 is omitted in FIG. 3.

The electric press processing machine 1 includes a support section 2 that supports the whole, a base 3 that is supported above the support section 2, a first motor 4 that is supported by the support section 2 below the base 3, and a base 3 that is supported above the support section 2. A first ball screw 5 installed through the base 3 and driven by the first motor 4, a first slide 6 installed at the tip of the first ball screw 5, and a first slide 6 supported by the support part 2 below the base 3. A second ball screw 8 installed through the base 3 and driven by the second motor 7, a second slide 9 installed at the tip of the second ball screw 8, and a second slide 9 installed at the tip of the second ball screw 8 to supply the material. A material supply section 10 is provided.

The support portion 2 is a member for placing the entire electric press processing machine 1 on the ground or the like. The support portion 2 of this embodiment is formed of a frame assembled in the shape of sides of a rectangular parallelepiped, but is not limited to this structure, and may be formed of other structures such as a plate-shaped member. Moreover, the support part 2 may be covered with a cover.

The base 3 is a planar plate and is installed above the support section 2 . The base 3 of this embodiment is installed horizontally on the upper end of the support part 2. The base 3 is formed with holes through which the first ball screw 5 and the second ball screw 8 pass. Furthermore, in the base 3 of this embodiment, a convex portion 3a projecting upward is installed at the center, and holes 3b are formed at the corners. The convex portion 3a plays the role of a mold during processing. The hole 3b is connected to a suction part (not shown), and suppresses scattering of the material by sucking the scattered material.

The first motor 4 is supported by the support section 2 below the base 3. The first ball screw 5 is installed to penetrate the base 3 and is driven by the first motor 4. In this embodiment, three first motors 4 and three first ball screws 5 are installed. A first slide 6 that is movable in the vertical direction is installed at the upper end of the three first ball screws 5.

In order to achieve high-speed specifications, it is preferable to use a hollow servo motor as the first motor 4 and arrange the first ball screw 5 on the screw shaft, since this makes the apparatus more compact. Alternatively, the first motor 4 and the first ball screw 5 may be connected by a belt to transmit the drive.

The first slide 6 of this embodiment has a hole 6a formed in the center into which the convex portion 3a of the base 3 can be inserted. Furthermore, wall portions 6b extending upward are formed at both left and right ends of the first slide 6. A mold M is placed on the upper end of the wall portion 6b.

In this way, the first slide 6 can play the role of a mold during processing by forming the hole 6a. In addition, the first slide 6 is formed with the wall portion 6b, thereby facilitating mold positioning, mold replacement, mold cleaning, and maintenance.

The second motor 7 is supported by the support section 2 below the base 3. The second ball screw 8 is installed to penetrate the base 3 and is driven by the second motor 7. In this embodiment, three second motors 7 and second ball screws 8 are installed. A second slide 9 movable in the vertical direction is installed at the upper end of the three second ball screws 8.

The second slide 9 is installed above the first slide 6. Further, it is preferable that the second slide 9 is installed so as to hide the first slide 6 when viewed from above, since the electric press machine 1 can be made smaller. Furthermore, the second slide 9 of this embodiment is provided with a downwardly directed convex portion 9a in the center.

In order to achieve high-speed specifications, it is preferable to use a hollow servo motor as the second motor 7 and arrange the second ball screw 8 on the screw shaft, since this makes the apparatus more compact. Alternatively, the second motor 7 and the second ball screw 8 may be connected by a belt to transmit the drive.

The material supply unit 10 supplies material to the vicinity of the center of the mold M. The material of this embodiment may be a powder such as ceramics or a fluid such as resin. The material supply section 10 can move the position of the supply port 10b in the horizontal direction and the height direction by means of a bellows-shaped or expandable cylinder section 10a. Therefore, the supply port 10b can move between the first slide 6 and the second slide 9. The cylindrical part 10a of the material supply part 10 of this embodiment extends above the first slide 6 from the left side of the electric press machine when viewed from the front, and is connected to the storage part 10c. The supply port 10b can supply material to the vicinity of the center of the mold M by moving to the right.

FIG. 4 is a diagram showing the arrangement of the axes of the first ball screw and the second ball screw of the electric press machine of this embodiment.

As shown in FIG. 4, the axes 5a of the three first ball screws 5 of this embodiment form a first isosceles triangle 5T with the front side as the vertex when viewed from above. Further, the axes 8a of the three second ball screws 8 of this embodiment form a second isosceles triangle 8T with the front side as the base when viewed from above.

In this way, the axes 5a of the three first ball screws 5 form the first isosceles triangle 5T, so that the first slide 6 can be moved stably, and the axes of the three second ball screws 8 can be moved stably. Since the center 8a forms the second isosceles triangle 8T, the second slide 9 can be moved stably.

The axes 5a of the three first ball screws 5 form a first isosceles triangle 5T with the front side as the apex when viewed from above, and the axes 8a of the three second ball screws 8 form a first isosceles triangle 5T when viewed from above. A second isosceles triangle 8T is formed with the front side as the base, and the first isosceles triangle 5T and the second isosceles triangle 8T are arranged so that they partially overlap when viewed from above. The press machine 1 can be made compact, the balance of the electric press machine 1 as a whole is improved, the first slide 6 and the second slide 9 can be moved stably, and the products can be processed with high precision. can be manufactured.

Furthermore, the axes 5a of the three first ball screws 5 are arranged outside the second isosceles triangle 8T when viewed from above, and the axes 8a of the three second ball screws 8 are located outside the first isosceles triangle when viewed from above. Since it is installed outside the isosceles triangle 5T, the overall balance of the electric press processing machine 1 is better, and the first slide 6 and the second slide 9 can be moved more stably, resulting in higher precision processing. products can be manufactured.

For example, when the perpendicular bisector from the apex to the base of the first isosceles triangle 5T overlaps the perpendicular bisector from the apex to the base of the second isosceles triangle 8T, the first slide 6 and The two slides 9 can be moved more stably, and processed products can be manufactured with higher precision.

Note that in this embodiment, a linear scale or the like may be installed for measuring the positions of the first slide 6 and the second slide 9. Note that the position measurement may be performed for each of the three first ball screws 5 and the three second ball screws 8.

FIG. 5 is a diagram showing the system configuration of the electric press machine of this embodiment. In addition, in FIG. 5, the system configuration of the first slide second axis and the system configuration of the first slide third axis are the same as the system configuration of the first slide first axis, and the system configuration of the second slide second axis is the same as the system configuration of the first slide first axis. The system configuration and the system configuration of the second slide third axis are similar to the system configuration of the second slide first axis.

The electric press machine 1 includes an operation panel 11 that is operated by an operator, and a first motor 4 that moves the first slide 6 and a second motor that moves the second slide 9 according to commands from the operation panel 11. 8.

Also, a first servo amplifier 41 and a second servo amplifier receive signals from the control unit 12 to drive and control the first motor 4 and the second motor 8, corresponding to each axis of the first ball screw 5 and the second ball screw 8. 81, a first encoder 42 and a second encoder 82 that detect the rotational speed of the first motor 4 and the second motor 8, and a first load detection section 43 such as a strain gauge or motor torque that detects the load applied to each axis. and a second load detection section 83, and a first position detection section 44 and a second position detection section 84 that detect the position of each axis.

The control unit 12 includes a command unit 12a that commands a position or a load to the first servo amplifier 41 and second servo amplifier 81 corresponding to each axis, and a first load detection unit 43 and a second load detection unit corresponding to each axis. 83, a calculation unit 12b that calculates a command value from the detection values of the first position detection unit 44 and the second position detection unit 84.

Next, position control and load control of the electric press machine of this embodiment will be explained.

In the position control of the electric press machine of this embodiment, the first position detecting section 44 and the second position detecting section 84 of each axis detect the position, and the control section 12 controls the first motor 4 and the second motor of each axis. 8 can be independently controlled to move the first slide 6 and the second slide 9 while maintaining a desired inclination angle or parallelism. The moving speeds of the first slide 6 and the second slide 9 are variable, and with respect to the speed switching position, the speed on the side closer to the upper limit position is made faster than the speed on the side farther from the upper limit position. Therefore, it becomes possible to shorten processing time.

Load control of the electric press machine of this embodiment is performed based on the loads detected from the first load detection section 43 and the second load detection section 83 of each axis. The loads detected from the first load detection section 43 and the second load detection section 83 of each axis are summed once in the calculation section 12b. The calculation unit 12b calculates the total load and sets it as the actual load, and calculates the difference between the set load obtained by dividing the predetermined entire target load into ⅓ and the actual load. Thereafter, the calculation unit 12b calculates the amount of change per time up to the set load and the load command to each axis for a predetermined arbitrary time. It is preferable that the arbitrary time and target load be determined accurately in consideration of material properties, material dimensions, and the like. Thereafter, the command unit 12a independently outputs the load command calculated by the calculation unit 12b to each axis. That is, the control unit 12 can independently control the first motor 4 and the second motor 8 of each axis to increase the pressure of the first slide 6 and the second slide 9 while maintaining the desired inclination angle or parallelism. .

The load command is output for a predetermined period of time until the detected load converges within a predetermined range with respect to the set load. That is, when the detected load converges within a predetermined range with respect to the set load for a predetermined time, it is determined that the actual load has reached the set load. Therefore, it is possible to approach the set load with high accuracy.

After the load is maintained for a predetermined period of time, pressure relief is started. The calculation unit 12b calculates the amount of change per time until the depressurization completion load and the load command to each axis for a predetermined arbitrary time. It is preferable that the arbitrary time and pressure release load be determined accurately in consideration of material properties, material dimensions, and the like.

The load command is output for a predetermined period of time until the detected load converges within a predetermined range with respect to the pressure relief load. That is, when the detected load converges within a predetermined range with respect to the pressure relief load for a predetermined time, it is determined that the actual load has reached the pressure relief load. Note that the pressure release load is preferably larger than 0. Therefore, it is possible to approach the pressure relief load with high accuracy.

The control unit 12 can switch the first slide 6 and the second slide 9 from position control to load control or from load control to position control. For example, the position control may be switched to the load control when the positions detected by the first position detection section 44 and the second position detection section 84 reach a predetermined control switching position. Alternatively, the position control may be switched to the load control when the loads detected by the first load detection section 43 and the second load detection section 83 reach a predetermined control switching load.

Next, an example of the operation of the electric press machine will be described.

FIG. 6 shows an example of a flowchart of the electric press machine of this embodiment. FIG. 7 shows an operation diagram of the electric press machine of this embodiment. FIG. 7(a) shows an operation diagram of the first slide of the electric press machine of this embodiment. FIG. 7(b) shows an operation diagram of the second slide of the electric press machine of this embodiment. FIG. 7(c) shows an operation diagram of the material supply section of the electric press machine of this embodiment.

Note that in this embodiment, as an example, a case where the first slide 6 and the second slide 9 move together will be described, but it is also possible that only one of the first slide 6 or the second slide 9 moves. be.

First, in step 1, the electric press machine 1 moves the first slide 6, the second slide 9, and the supply port 10b of the material supply section 10 to a predetermined first position (ST1). As shown in FIG. 5, control of the electric press machine 1 of this embodiment is started by operating the operation panel 11. The command unit 12a sends commands to each of the three first servo amplifiers 41, and the three first motors 4 are each independently driven to move the first slide 6. Further, the command section 12a sends commands to the three second servo amplifiers 81, so that the three second motors 8 are each independently driven to move the second slide 9. Further, the command unit 12a moves the supply port 10b by a drive unit (not shown).

FIG. 8 shows a state in which the first slide 6, second slide 9, and supply port 10b of the electric press machine 1 of this embodiment have been moved to a predetermined first position.

The predetermined first position of the first slide 6 and the second slide 9 in this embodiment is a position where the supply port 10b can be inserted between the first slide 6 and the second slide 9. In step 1, the electric press machine 1 lowers the first slide 6 and raises and lowers the second slide 9 to create an interval for inserting the supply port 10b between the first slide 6 and the second slide 9. Open.

Next, in step 2, the material supply section 10 is moved to the second position (ST2).

FIG. 9 shows a state in which the supply port 10b of the material supply section 10 of the electric press machine 1 of this embodiment has been moved to a predetermined second position. When the supply port 10b moves to the second position, it covers at least a portion of the hole Ma formed in the mold M. In this embodiment, the first position of the supply port 10b is the backward end, and the second position is the forward end.

Next, in step 3, the electric press machine 1 raises the first slide 6 to the second position (ST3). Commands are sent from the command unit 12a shown in FIG. 5 to the three first servo amplifiers 41, the three first motors 4 are independently driven, and the first slide 6 is raised.

FIG. 10 shows a state in which the first slide 6 of the electric press machine 1 of this embodiment has moved to the second position. When the first slide 6 rises, the upper surface 6a1 of the convex portion 3a moves downward through the hole Ma of the mold M relatively. Then, a space of a recess Ma1 is formed in which the upper surface 6a1 of the convex portion 3a becomes a bottom surface and the side surface Mb of the hole Ma of the mold M becomes a wall surface. Since the supply port 10b is located above the recess Ma1, the material is supplied from the supply port 10b into the space of the recess Ma1. The supplied material accumulates in the recess Ma1. The material may be fed by gravity or by suction.

Next, in step 4, the supply port 10b of the electric press machine 1 is reciprocated several times and then moved to the first position (ST4).

FIG. 11 shows a state in which the supply port 10b of the electric press machine 1 of this embodiment has moved to the first position. The electric press machine 1 of this embodiment moves the supply port 10b several times in the front-rear direction or left-right direction. By reciprocating the supply port 10b several times, clogging of the material or formation of a gap between the materials in the space of the recess Ma1 is prevented. After the reciprocating operation, the supply port 10b moves to the first position.

Next, in step 5, the electric press machine 1 raises the first slide 6 to the third position and lowers the second slide 9 to the second position (ST5). Commands are sent from the command unit 12a shown in FIG. 5 to the three first servo amplifiers 41 and the three second servo amplifiers 81, and the three first motors 4 and the three second motors 7 are respectively driven independently. As a result, the first slide 6 goes up and the second slide 9 goes down.

FIG. 12 shows a state in which the first slide 6 of the electric press machine 1 of this embodiment has been raised to the third position, and the second slide 9 has been lowered to the second position.

The electric press machine 1 of this embodiment lowers the second slide 9 and inserts the convex portion 9a of the second slide 9 into the concave portion Ma1 formed by the mold M and the convex portion 3a. Then, the convex portion 9a presses the material in the concave portion Ma1 from above. At this time, it is preferable to slightly raise the first slide 6 because it can reduce the density difference in the direction of the pressurizing axis.

Next, in step 6, the electric press machine 1 further lowers the second slide 9 and determines whether the second slide 9 has reached a predetermined third position or a predetermined load (ST6 ). In step 6, if the second slide 9 has not reached the predetermined third position or the predetermined load, the second slide 9 is further lowered.

In step 6, when the second slide 9 reaches the predetermined third position or the predetermined load, in step 7, the electric press machine 1 moves the first slide 6 and the second slide 9 to the predetermined position. Move it to the 4th position (ST7). At the fourth position, both the first slide 6 and the second slide 9 are set lower than the third position, and a so-called with-drawing operation is performed.

Next, in step 8, the electric press machine 1 stops or holds the first slide 6 and the second slide 9 at the fourth position for a predetermined time (ST8).

Next, in step 9, the electric press machine 1 moves the first slide 6 and the second slide 9 to the fifth position (ST9). Pressure can be removed by moving the first slide 6 and the second slide 9 to the fifth position.

Next, in step 10, the electric press machine 1 lowers the first slide 6 to a predetermined first position (ST10). When the first slide 6 descends, the upper surface 3a1 of the convex portion 3a appears to rise relatively, and the processed material is pushed by the upper surface 3a1 of the convex portion 3a and comes out of the hole Ma.

Next, in step 11, the electric press machine 1 raises the second slide 9 (ST11). The second slide 9 moves upward, and the convex portion 9a separates from the workpiece G. The electric press machine 1 of this embodiment raises the second slide 9 to the first position.

FIG. 13 shows a state in which the first slide 6 and the second slide 9 of the electric press machine 1 of this embodiment have moved to a predetermined first position.

In the electric press machine 1 of this embodiment, the second slide 9 is raised after the first slide 6 is lowered after the machining is completed. Note that the lowering of the first slide 6 and the raising of the second slide 9 may be performed simultaneously. The processed product G exits from the hole Ma while being placed on the upper surface 3a1 of the convex portion 3a. After the first slide 6 moves to the first position, it is preferable that the heights of the upper surface Mc of the mold M and the upper surface 3a1 of the convex portion 3a become the same.

Next, in step 12, the electric press machine 1 moves the completed workpiece (ST12).

FIG. 14 shows a state in which the workpiece of the electric press machine 1 of this embodiment is moved. The electric press machine 1 of this embodiment pushes and moves the workpiece placed on the upper surface 3a1 of the convex portion 3a with the supply port 10b. When the first slide 6 is raised to the first position from the state shown in FIG. 11, a recess Ma1 is formed in which the upper surface 6a1 of the convex portion 3a becomes the bottom surface and the side surface Mb of the hole Ma of the mold M becomes the wall surface. Material is supplied from the supply port 10b. The supplied material accumulates in the recess Ma1, as shown in FIG.

Thereafter, the electric press machine 1 repeatedly operates in the same manner as the operation diagram shown in FIG.

In this way, the electric press machine 1 of the present embodiment can perform material supply, pressing process, and movement of the workpiece in a smooth series of operations, and can improve productivity.

As described above, the electric press processing machine 1 of this embodiment includes a support part 2 that supports the whole, a base 3 supported above the support part 2, and a base 3 supported by the support part 2 below the base 3. three first ball screws 5 installed through the base 3 and driven separately by the three first motors 4; and a first ball screw 5 installed at the tips of the three first ball screws 5. 1 slide 6, three second motors 7 supported by the support part 2 below the base 3, and three second motors 7 installed through the base 3 and driven separately by the three second motors 7. A second ball screw 8 and a second slide 9 installed at the tips of the three second ball screws 8, the first slide 6 being installed below the second slide 9, The axis 5a forms a first isosceles triangle 5T, and the axes 8a of the three second ball screws 8 form a second isosceles triangle 8T.

Therefore, the electric press machine 1 of this embodiment is compact because the slides 6 and 9 are supported by the three-axis ball screws 5 and 8, and has good balance because the axes 5a and 8a are formed into an isosceles triangle. This enables high-precision molding. Moreover, simultaneous molding of multiple pieces becomes possible.

Furthermore, in the electric press processing machine 1 of the present embodiment, the axes 5a of the three first ball screws 5 form a first isosceles triangle 5T with the front side as the apex when viewed from above, and the three second The axis 8a of the ball screw 8 forms a second isosceles triangle 8T whose base is the front side when viewed from above. Therefore, the electric press machine 1 of this embodiment can be made smaller.

In the electric press machine 1 of this embodiment, the first isosceles triangle 5T and the second isosceles triangle 8T are arranged so as to partially overlap when viewed from above. Therefore, the electric press machine 1 of this embodiment can be made smaller.

In the electric press processing machine 1 of this embodiment, the axial centers 5a of the three first ball screws 5 are arranged outside the second isosceles triangle 8T when viewed from above, and the axial centers 8a of the three second ball screws 8 is arranged outside the first isosceles triangle 5T when viewed from above. Therefore, the electric press machine 1 of this embodiment can be made smaller.

The electric press machine 1 of this embodiment has a perpendicular bisector 5c from the apex to the base of the first isosceles triangle 5T, and a perpendicular bisector from the apex to the base of the second isosceles triangle 8T. 8c are on the same straight line. Therefore, the electric press machine 1 of this embodiment can be made smaller, and the balance of the electric press machine 1 as a whole is better, and the first slide 6 and the second slide 9 can be moved stably. It is possible to manufacture processed products with higher precision.

Although the electric press machine 1 has been described above based on several embodiments, the present invention is not limited to these embodiments, and various combinations or modifications are possible.

1... Electric press processing machine 2... Support part 3... Base 4... First motor 5... First ball screw 6... First slide 7... Second motor 8... Second ball screw 9... Second slide 10... Material supply part 11 …Operation panel 12…Control unit

Claims (5)

a support part that supports the whole;
a base supported above the support part;
three first motors supported by the support section below the base;
three first ball screws installed through the base and driven separately by the three first motors;
a first slide installed at the tip of the first ball screw;
three second motors supported by the support section below the base;
three second ball screws installed through the base and driven separately by the three second motors;
a second slide installed at the tip of the second ball screw;
Equipped with
the first slide is installed below the second slide,
The axes of the three first ball screws form a first isosceles triangle,
The electric press processing machine is characterized in that the axes of the three second ball screws form a second isosceles triangle. The axes of the three first ball screws form a first isosceles triangle with the front side as the apex when viewed from above,
The electric press machine according to claim 1, wherein the axes of the three second ball screws form a second isosceles triangle whose base is the front side when viewed from above. The electric press machine according to claim 1 or 2, wherein the first isosceles triangle and the second isosceles triangle are arranged so as to partially overlap when viewed from above. The axes of the three first ball screws are arranged outside the second isosceles triangle when viewed from above,
The electric press machine according to any one of claims 1 to 3, wherein the axes of the three second ball screws are arranged outside the first isosceles triangle when viewed from above. . A perpendicular bisector from the apex of the first isosceles triangle to the base and a perpendicular bisector from the apex to the base of the second isosceles triangle are on the same straight line. An electric press machine according to any one of claims 1 to 4.

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