JP2009034701A - Connecting rodless press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting rodless press in which the increase of the weight of a follower system and the enlargement of itself can be prevented. <P>SOLUTION: Disclosed is a connecting rodless press 1 in which a yoke 6 is freely rotatably fitted to the outer circumference of the eccentric part 5a of an eccentric shaft 5, and the yoke 6 is fitted to a sliding chamber 7h formed at a slide 7 so as to be freely slidable to the horizontal direction, and the space between the yoke 6 and the eccentric part 5a of the eccentric shaft 5 is provided with a shut height regulating mechanism 10 composed of an eccentric member 11 arranged rotatably to both and a rotating means 12 rotating the eccentric member 11. Upon the rotation of the eccentric member 11, the center of the eccentric member 11 moves up and down, and since the slide 7 moves up and down in accordance with the rotation of the eccentric member 11, the shut height can be changed. Further, since only the eccentric member 11 is arranged between the yoke 6 and the eccentric part 5a of the eccentric shaft 5, the height of the press can be suppressed, and the enlargement of the press can be prevented. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a connecting rodless press.

  Conventionally, a press that does not use a connecting rod has been developed in order to make the press compact, and an example of a press that does not use a connecting rod is a Scotch yoke press. Hereinafter, the scotch yoke press of Conventional Example 1 will be described with reference to FIG.

In FIG. 3, 100 is a press frame and 101 is a slide. The slide 101 is guided by a slide guide (not shown) so as to be movable up and down. A hollow sliding chamber 102 is formed inside the slide 101, and sliding surfaces 103 are formed on both upper and lower surfaces of the sliding chamber 102.
A yoke 104 is inserted in the sliding chamber 102 so as to be in contact with the upper and lower sliding surfaces 103 and to be movable in the lateral direction.
The yoke 104 is attached to the eccentric shaft 105. When the eccentric shaft 105 rotates, the yoke 104 moves in a circular motion, so that the slide 101 is moved up and down.

Such a scotch yoke press is also provided with a shut height adjusting mechanism.
As shown in FIG. 3, an upper mold M <b> 1 is attached to the lower surface of the slide 101 via an upper die holder 106. On the other hand, a lower mold M <b> 2 is attached to the upper surface of the bed 107 through a lower die holder 108. A shut height adjusting mechanism 110 is provided between the bed 107 and the lower die holder 108.
The shut height adjusting mechanism 110 is configured to adjust the height between the upper and lower molds M1 and M2 by advancing and retracting the wedge-shaped wedge 111 with a bolt / nut type driving device 112 to adjust the height of the lower die holder 108. Is what you do.

However, in the scotch yoke press of the conventional example 1, since there is a shut height adjusting mechanism 110 below the molds M1 and M2, the mold lubricant and scale easily adhere to and enter the wedge 111, and the wedge 111 is corroded. There is a problem that it is liable to cause malfunction such as inviting or the wedge 111 to be fixed.
Further, when the lower die holder 108 or the like is taken out, it is necessary to adjust the difference between the carriage outside the press and the bed surface height direction each time, which is troublesome.

As another shut height adjusting mechanism of the scotch yoke press, there is a conventional example 2 (see Patent Document 1).
In FIG. 4, 224 is a slide, 225 is a yoke, and 226 is a main shaft. 223 is a sliding chamber, 221 is an upper sliding surface, and 222 is a lower sliding surface. The yoke 225 moves circularly while reciprocating in the horizontal direction in contact with the upper and lower sliding surfaces 221 and 222 in the sliding chamber 223. The shut height adjusting mechanism is attached to the lower surface of the slide 224.
The details of the shut height adjusting mechanism are as follows. A wedge holder 201 is attached to the bottom of the slide 224 so as to be slidable in the vertical direction, and a lower wedge 202 and an upper wedge 203 that are engaged with each other on an inclined surface are overlapped in the wedge holder 201, The end surface of the wedge 202 is provided with a female screw 205 that is screwed with a male screw 204 that protrudes from the wedge holder. Therefore, when the rotating shaft is rotated, a wedge action is generated by the screw advancement and moves up or down against the urging force, and the distance from the center R of the main shaft 226 to the bottom surface of the wedge holder 201 is increased or decreased. Can do.
The wedge holder 201 is attached from below the slide 224 by a suspension mechanism 210 that is suspended by a bolt 211 and a spring 212.

However, the Scotch yoke press of the conventional example 2 is provided with a shut height adjusting mechanism to be added to the lower part of the slide 224, and the wedge holder 201, the lower wedge 202, and the upper wedge 203 are arranged in the vertical direction. As a result, the distance from the eccentric shaft to the lower surface of the wedge holder 201 is increased, and the height of the press is increased accordingly.
Moreover, since the weight of the driven system increases by the amount of the shut height adjustment mechanism, the drive system and braking mechanism must be increased in size and output, and the compactness characteristic of the Scotch yoke press is lost. The running cost also increases.

  In addition, when multi-step molding is performed, the width of the slide 224 increases as the number of steps increases, but the width of the yoke 225 increases as the width of the slide 224 increases. Weight increases. In particular, when a shut height adjusting mechanism is provided, the shut height adjusting mechanism is also increased in size, which further increases the weight.

Japanese Patent Publication No.7-115227

  An object of this invention is to provide the connecting rodless press which can prevent the increase in the weight of a driven system, and the enlargement of a press in view of the said situation.

The connecting rodless press of the first invention is a connecting rodless press in which a yoke is rotatably fitted on the outer periphery of the eccentric part of the eccentric shaft, and the yoke is slidably fitted in a sliding chamber formed on a slide. And a shut height adjusting mechanism comprising an eccentric member rotatably disposed between the yoke and the eccentric portion of the eccentric shaft, and a rotating means for rotating the eccentric member. It is characterized by that.
A connecting rodless press according to a second aspect of the present invention includes the yoke according to the first aspect, and the plurality of yokes are arranged side by side in the axial direction of the eccentric shaft in a state of being spaced apart from each other. It is characterized by that.

According to the first invention, if the eccentric member is rotated, the center of the eccentric member moves up and down, and the slide moves up and down in accordance with the rotation of the eccentric member, so that the shut height can be changed. Further, since only the eccentric member is arranged between the yoke and the eccentric part of the eccentric shaft, the height of the press can be suppressed, and the press can be prevented from being enlarged.
According to the second aspect of the invention, the load from the slide can be received at a wide range and transmitted to the eccentric shaft, so that a structure strong against the eccentric load can be obtained. Further, even if the width of the slide is increased, the width of each yoke can be reduced, so that an increase in the weight of the driven system can be suppressed. Therefore, the compactness of the press can be maintained, and an increase in running cost can be suppressed.

Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1A is a front view of a connecting rodless press according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line BB in FIG.

  In FIG. 1, a press 1 has a frame 2, a bed 3, and four tie rods 4 connecting them. The press 1 may have a crown and upright instead of the frame 2.

An eccentric shaft 5 is attached to the frame 2. The eccentric shaft 5 is provided with an eccentric portion 5a at the central portion in the axial direction. The eccentric shaft 5 is provided with a pair of coaxial parts 5b, 5b so as to sandwich the eccentric part 5a, and the pair of coaxial parts 5b, 5b are rotatably supported by the frame 2.
A slide 7 is attached to the eccentric portion 5 a of the eccentric shaft 5. The slide 7 is formed with a sliding chamber 7h penetrating between the left and right surfaces in FIG. 1, and is formed so as to accommodate the eccentric portion 5a in the sliding chamber 7h.
The eccentric shaft 5 is connected to a drive mechanism such as a speed reducer, and a braking mechanism such as a clutch and a brake is also attached.

  As shown in FIG. 1, a yoke 6 is provided on the eccentric portion 5 a of the eccentric shaft 5. The yoke 6 is slidably fitted in the sliding chamber 7h of the slide 7. That is, the eccentric part 5 a of the eccentric shaft 5 and the slide 7 are connected via the yoke 6.

  With the configuration as described above, when the drive mechanism is operated, the eccentric shaft 5 rotates. As the eccentric shaft 5 rotates, the yoke 6 performs an operation combining the vertical movement and the horizontal movement. The slide 7 is moved up and down by the operation. Therefore, if the upper mold lower mold of the multi-process mold is disposed on the bottom surface of the slide 7 and the upper surface of the bed 3, the forging material can be sandwiched between the upper mold lower mold of the multi-process mold. .

Next, the shut height adjusting mechanism 10 will be described.
As shown in FIG. 1, an eccentric member 11 of the shut height adjusting mechanism 10 is provided between the yoke 6 and the outer periphery of the eccentric portion 5 a of the eccentric shaft 5. The eccentric member 11 has a center of an outer peripheral surface (surface in contact with the yoke 6) and a center of an inner peripheral surface (surface in contact with the eccentric portion 5a) in a cross section orthogonal to the axial direction (left and right direction in FIG. 1A). Is an eccentric sleeve.
The eccentric member 11 is provided with a worm wheel 11g along the outer peripheral surface thereof. A groove-shaped space is formed on the inner surface of the yoke 6 along the inner peripheral surface thereof, and the worm wheel 11g of the eccentric member 11 is disposed in the groove-shaped space so as not to contact the inner surface of the yoke 6. ing.

  As shown in FIG. 1, a through-hole communicating with the groove-shaped space is formed in the upper portion of the yoke 6 along a direction orthogonal to the axial direction of the eccentric shaft 5. The worm shaft 12b is inserted along the axial direction. The worm shaft 12b is attached at its base end with a drive device 12a such as a hydraulic motor, an electric motor with a reduction gear, or a servo motor that rotates the worm shaft 12b. Is biting.

  Therefore, when the drive device 12a is operated, the worm shaft 12b and the worm wheel 11g rotate, and the eccentric member 11 can be rotated around the eccentric portion 5a of the eccentric shaft 5. When the eccentric member 11 rotates, the center of the eccentric member 11 moves up and down, and the yoke 6 moves up and down relative to the eccentric portion 5a. In other words, the yoke 6 moves up and down with respect to the slide. Then, since the slide 7 moves up and down in accordance with the vertical movement of the yoke 6, the shut height can be changed.

Further, since the eccentric member 11 is a cylindrical member and is thin, the eccentric member 11 can be disposed between the yoke 6 and the eccentric portion 5 a of the eccentric shaft 5 without increasing the size of the yoke 6. . Then, even if the shut height adjusting mechanism 10 is provided, the height of the press can be suppressed, and an increase in the size of the press can be prevented.
Moreover, since the eccentric member 11 is light, an increase in the weight of the driven system due to the provision of the shut height adjusting mechanism 10 can be suppressed. Then, since it is not necessary to increase the size and output of the drive system and the braking mechanism, the compactness of the press can be maintained, and an increase in running cost can be suppressed.
The driving device 12a and the worm shaft 12b are rotating means in the claims.

  In the above example, the drive device 12a and the worm shaft 12b are provided at the upper portion of the yoke 6. However, the positions at which the drive device 12a and the worm shaft 12b are provided are not particularly limited. Etc. may be provided. That is, as long as the worm shaft 12b can be engaged with the worm wheel 11g of the eccentric member 11, the positions where the drive device 12a and the worm shaft 12b are provided are not particularly limited.

  Furthermore, the configuration for rotating the eccentric member 11 is not limited to the configuration described above. For example, a configuration may be adopted in which a gear is provided on the outer peripheral surface of the eccentric member 11, a rack that meshes with the gear is provided, and the eccentric member 11 is rotated by advancing and retreating the rack by a drive device such as a cylinder. A pinion gear that meshes with the gear provided on the shaft may be provided, and the eccentric member may be rotated by rotating the pinion gear. Moreover, it is good also as a structure which provided the nut part provided with the screw hole orthogonal to the axial direction of the eccentric shaft 5 in the eccentric member, and screwed the screw shaft in this nut part. In this case, since the nut portion can be moved in the screw shaft direction by rotating the screw shaft, the eccentric member can be rotated.

  In the above embodiment, the configuration in which the slide 7 and the eccentric portion 5a of the eccentric shaft 5 are connected by one yoke 6 has been described. However, the slide 7 and the eccentric portion 5a of the eccentric shaft 5 are connected by a plurality of yokes 6. You may make it do.

2A is a front view of a connecting rodless press according to another embodiment of the present invention, and FIG. 2B is a cross-sectional view taken along line BB in FIG. As shown in the figure, the connecting rodless press according to another embodiment includes a pair of yokes 6 and 6. The pair of yokes 6 and 6 have a width W2 narrower than a width W1 of the slide 7, and are arranged side by side in the axial direction of the eccentric shaft 5 in a state of being spaced apart from each other.
Then, when a load from the slide 7 is applied, the load can be received at a wide position and transmitted to the eccentric shaft 5, so that a structure strong against an eccentric load can be obtained.
In addition, since the total weight of the pair of yokes 6 and 6 is lighter than that of the yoke having the same width as the slide 7, the weight of the driven system including the yoke 6 can be suppressed. Then, the drive system and the braking mechanism can be reduced in size and output.

Furthermore, in the case of the press 1 of the present embodiment, since it is not necessary to make the width W1 of the slide 7 and the width W2 of the yoke 6 the same, even if the width W1 of the slide 7 is increased, the individual yokes 6 are more than necessary. There is no need to increase the size. That is, regardless of the width W1 of the slide 7, each yoke 6 may be formed to have a width necessary for maintaining its strength and supporting the load. Then, even if the width W1 of the slide 7 is increased, it is possible to prevent the yoke 6 from being unnecessarily increased in size and weight, so that it is possible to prevent the driven system including the yoke 6 from increasing in size. , Weight increase can be suppressed.
Therefore, even if the press 1 of this embodiment is adopted in a multi-step press in which the width W1 of the slide 7 is wide, it is possible to suppress an increase in the size and weight of the driven system. Therefore, it is possible to suppress an increase in size and output of the drive system and the braking mechanism, so that the compactness of the press can be maintained and an increase in running cost can be prevented.

  Further, in FIG. 2, the pair of yokes 6 and 6 have the same width W2, but the widths of both may be different. When a multi-step mold is attached to the slide 7, the molding load differs from mold to mold, and in the width direction of the slide 7 (the horizontal direction in FIG. 2), for example, the molding load by the mold located on the left side is on the right side. It may be larger than the molding load by the located mold. In such a case, it is preferable that the width of the yoke 6 positioned on the left side is wider than the width of the yoke 6 positioned on the right side. That is, if the width of each yoke 6 is adjusted in accordance with the load applied to each yoke 6, the total weight of all the yokes 6 can be reduced, and the structure can be made stronger against the eccentric load.

  Further, in FIG. 2, the pair of yokes 6 and 6 are disposed symmetrically with respect to the press center CL, but the pair of yokes 6 and 6 are disposed at appropriate positions on the left and right with respect to the press center CL. It only has to be done. And if it arrange | positions in the right-and-left appropriate position with respect to the press center CL, since the load from the slide 7 can be transmitted to the eccentric shaft 5 with good balance, it will be made a structure stronger against the eccentric load. be able to.

  The number of yokes 6 is not limited to two, but may be three or more, and the number is not particularly limited. Even when two or more yokes 6 are provided, if the widths of all the yokes 6 are not made uniform and the widths of the yokes 6 are adjusted according to the load applied to the yokes 6, a structure that is resistant to eccentric loads can be obtained. In addition, the driven system can be reduced in weight and size.

  When a plurality of yokes 6 are provided, the worm wheel 11g of the eccentric member 11 is disposed in the space between the adjacent yokes 6, and rotating means (drive device 12a, worm shaft 12b) for rotating the eccentric member 11 in this space. ), It is not necessary to provide a special space for installing the worm wheel 11g of the eccentric member 11 and the rotating means in the yoke 6, so that the structure of the yoke 6 can be prevented from becoming complicated.

(A) is a front view of the connecting rodless press which concerns on one Embodiment of this invention, (B) is a BB sectional view taken on the line of (A). (A) is a front view of the connecting rodless press which concerns on other embodiment of this invention, (B) is a BB sectional view taken on the line of (A). It is a front view of the connecting rodless press of the prior art example 1. It is a partial front view of the connecting rodless press of the prior art example 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Press frame 5 Eccentric shaft 5a Eccentric part 6 Yoke 7 Slide 7h Sliding chamber 10 Shut height adjustment mechanism 11 Eccentric member 12 Rotating means

Claims (2)

A connecting rodless press in which a yoke is rotatably fitted on the outer periphery of the eccentric part of the eccentric shaft, and the yoke is slidably fitted in a sliding chamber formed in the slide,
An eccentric member disposed between the yoke and the eccentric portion of the eccentric shaft so as to be rotatable with respect to both;
A connecting rodless press comprising a shut height adjusting mechanism including a rotating means for rotating the eccentric member. A plurality of yokes,
The plurality of yokes are
2. The connecting rodless press according to claim 1, wherein the connecting rodless press is arranged side by side in the axial direction of the eccentric shaft while being spaced apart from each other.

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