JP5337937B2 - Press machine - Google Patents

Description

The present invention relates to a press device by mechanical drive .

In a conventional mechanical driving press, for example, as disclosed in Patent Document 1, a crankshaft and a slide are connected via a connecting rod and a plunger. Although this is the simplest configuration, there is a problem that the height of the press device is increased by the length of the connecting rod. Moreover, there is because the connecting rod and the plunger are connected only at the portion of the connecting pin, the load of the press stress is concentrated on this portion, a problem in that backlash is likely to occur due to the expansion of the gap. When the play occurs, it becomes one of the causes of a large noise during the press breakthrough. It also has an adverse effect on the mold used.

Patent Document 2 has been proposed as an attempt to improve the problems caused by the connecting rod as described above and to keep the height of the press device low. This technique proposes a mechanism that directly converts the rotational motion of the eccentric part of the crankshaft into a reciprocating linear motion using a sliding guide mechanism that slides in the horizontal direction without using a connecting rod. Thereby, the height of the press device can be kept low, and an adjusting screw for adjusting the slide position can be provided. However, in this mechanism, since the sliding guide mechanism slides in the horizontal direction, excessive stress is applied to the left and right wall portions of the rotational motion / linear motion converting portion, resulting in loss of pressing force and wear. It may also be a cause of speeding up.

Moreover, in patent document 3, the mechanical press apparatus which provided the sliding guide mechanism like the said patent document 2 in the ram is proposed. Even with this technology, since the connecting rod is not used, the height of the press device can be kept low. However, since the rotary motion-linear motion conversion unit is integrated with the ram, an adjustment screw for position adjustment must be provided. There is a problem that can not be. In this document, an example in which the sliding surface of the sliding guide mechanism is formed in a curved surface is also shown. However, since the sliding guide mechanism basically slides in the left-right direction , After all, excessive stress is applied.
Japanese Examined Patent Publication No. 7-59360 JP 2003-31486 A JP-A-55-48500

In view of the above-described problems, an object of the present invention is to provide a press device that is mechanically driven with a low profile and a low horizontal stress load.

In order to solve the above-described problems, the press device according to the present invention includes a slider and a support body that are slidably arranged in a vertical direction within a frame, and the slider is guided and supported by the frame. The slider and the support body are accommodated in the upper and lower directions through a connecting portion, and the connecting portion is configured to adjust the distance between the slider and the support body. And
The bearing body has a bearing cavity having an arc-shaped cross section formed in a direction perpendicular to the sliding direction of the slider and the bearing body, and the bearing cavity has an inner periphery of the bearing cavity. A support driving body having an outer peripheral surface with an arc-shaped cross section that is in sliding contact with the surface is rotatably supported,
The support drive body has an eccentric rotation shaft that is arranged in parallel with the rotation axis of the support drive body and performs eccentric rotation about an eccentric shaft that is disposed at a position displaced with respect to the rotation axis of the support drive body. Support ,
The eccentric shaft is disposed at a position displaced in the horizontal direction with respect to the center line AA ′ of the support drive body passing through the rotation center of the support drive body and along the sliding direction of the support body. It is the most important feature to become Te.

Further, in the present invention, prior to Symbol support and drive member is formed into a cylindrical shape, formed by a cylindrical shape of the inner circumferential surface of the bearing cavity having an inner peripheral surface having substantially the same curvature as the cylindrical surface of the support and drive member This is the main feature.

Furthermore, in the present invention, the support drive body is formed in a partial spherical shape obtained by cutting a part of a sphere, and the inner peripheral surface of the support cavity has a partial spherical shape having an inner peripheral surface having substantially the same curvature as the sphere. The main feature is that it is formed.
The main feature of the present invention is that the eccentric rotation shaft is a crank shaft or an eccentric shaft.

In the press device according to the present invention, the rotational motion of the eccentric rotation shaft can be converted into a reciprocating curve motion by a combination of the slider and the support body without using the connecting rod, and can be transmitted to the slider via the conversion unit . Ri Do enabling low profile, it can cope with the position adjustment of the slider by adjusting the connecting portion.

In addition, since the support drive body and the support body are configured to contact and slide on the circumferential surface or the partial spherical surface, the stress concentration can be dispersed and alleviated, thereby extending the life of the press device and increasing the life. Accuracy can be realized.

The present invention will be described below with reference to the drawings of preferred embodiments. FIG. 1 shows a front sectional view of a first embodiment of the press device according to the present invention. FIG. 2 is a perspective sectional view showing the main structure of the press apparatus of this embodiment. A slider 2 is inscribed in the frame 1 of the press device so as to be slidable in the vertical direction . The slider 2 is connected to the support body 3 via a connecting portion 8. The scaffold 3 includes a cylindrical bearing cavity 4 therein, the supporting and drive member 5 is supported on the bearing cavity 4.

The outer peripheral surface 6 the shape of the supporting and driving member 5 is configured into a cylindrical shape having substantially the same curvature as the bearing cavity 4, it is rotatably in contact with the inner peripheral surface of the bearing cavity 4 of the scaffold 3. With respect to the contact method between the support cavity 4 and the outer peripheral surface 6 of the support driving body 5, sliding contact between both opposing surfaces can be used, but is not limited thereto. Further, as the shape of the support cavity 4 and the shape of the outer periphery 6 of the support drive body, it is also possible to form a partial spherical shape that is a shape obtained by cutting a part of the spherical body .

Further, the support driving body 5 is rotatably connected to the eccentric shaft 7 in the vicinity of the outer peripheral surface 6. The eccentric shaft 7 used in this example is a crankshaft, and its structure is shown in FIG. Between the drive shaft 11, transmission shaft 12 is provided across the connecting plate 13, the center of the transmission shaft 12 is disposed offset from the rotational center of the drive shaft 11. The drive shaft 11 is connected to a rotational power source, and the transmission shaft 12 can rotate eccentrically about the rotation center of the drive shaft 11 .

In the above embodiment, the support body 3 is accommodated in the slider 2, the support body 3 is supported by the support drive body 5, and the support drive body 5 is supported by the eccentric shaft 7 . As a result, the transmission shaft 12 of the eccentric shaft 7 rotates eccentrically, so that the slider 2 is driven in the vertical direction . By adjusting the length of the connecting portion 8 an adjustment screw is provided to the connecting portion 8 which connects the scaffold 3 and the slider 2, Ru can change the relative distance between the bearing body 3 and the slider 2. Thereby, the height position of the slider 2 can be adjusted.

Next, the operation of this embodiment will be described. Since the support driver 5 is configured to be connected to the transmission shaft 12 of the eccentric shaft 7 , it receives power as the transmission shaft 12 rotates eccentrically . However, since the support drive body 5 is housed in the support body 3 and the position thereof is regulated, the support drive body 5 cannot move in the horizontal direction and the vertical direction with respect to the support body 3 .

On the other hand, the support drive body 5 is rotatably connected to the eccentric shaft 7, and is also in contact with the support body 3 so as to be rotatable on the outer peripheral surface 6 of the support drive body 5 . The support drive body 5 rotates in the support cavity 4 of the support body 3 by the eccentric rotation of the transmission shaft 12 . For example, when the transmission shaft 12 of the eccentric shaft 7 in FIG. 1 is eccentrically rotated clockwise, the support driving body 5 is rotated counterclockwise.

However, since the turning radius of the support drive body 5 is set larger than the eccentric rotation radius of the transmission shaft 12 , the rotation of the support drive body 5 is performed when the connecting plate 13 which is the crank of the eccentric shaft 7 is in the horizontal position. The movement stops. When the transmission shaft 12 continues to further eccentrically rotate , the support driving body 5 starts to rotate clockwise. Connecting plate 13 of the eccentric shaft 7 described above as the horizontal position after the leveled position of the opposite side, the same operation is Ri returned Repetitive. As a result , with the eccentric rotation of the transmission shaft 12 in the eccentric shaft 7 , the support driving body 5 repeats the reciprocating rotation operation in the forward and reverse directions .

Since the center of rotation of the drive shaft 11 is arranged in a fixed position in the eccentric shaft 7, the connecting portion positioned between the supporting and driving member 5 and the transmission shaft 12 will move up and down in accordance with the eccentric rotation of the transmission shaft 12 . As a result, the support body 3 that rotatably supports the support drive body 5 slides in the vertical direction, and the slider 2 connected to the support body 3 via the connecting portion 8 is driven in the vertical direction. A press operation will be performed .

In the conventional press devices of Patent Document 2 and Patent Document 3 that are not of the connecting rod type, since the sliding portions are formed on the upper and lower end faces of the slider, the horizontal stress is directly applied to the left and right wall surfaces of the sliding guide mechanism. A heavy burden was imposed. However, in the press device according to the present invention, since the support body 3 and the support drive body 5 are in surface contact with an arcuate curved surface, the stress in the horizontal direction and the vertical direction can be received over the entire surface, and the local surface The burden is reduced. In addition, with this configuration, there is no possibility of causing play at the connecting portion between the connecting rod and the slider as occurs in a press device using a connecting rod type.

FIG. 4 shows a second embodiment of the pressing device according to the present invention. In this embodiment, a configuration in which the supporting and driving member 5 and the transmission shaft 12 of the eccentric shaft 7 is arranged a connection portion connected to the lower side of the supporting and driving member 5. The operation of the slider 2 can slide in the vertical direction by the eccentric rotation of the transmission shaft 12 in the eccentric shaft 7 in substantially the same manner as in the first embodiment.

FIG. 5 is a front sectional view showing a third embodiment of the pressing apparatus according to the present invention. In this embodiment, the connection between the support drive body 5 and the eccentric shaft 7 is substantially the same arrangement as in the first embodiment . However, the connection position (BB ′) of the eccentric shaft 7 is shifted in the horizontal direction with respect to the center line (AA ′) of the support driving body 5. This configuration can make and lowering operation and increased operation slider 2 during pressing asymmetric operation, it is possible to control the bottom dead center of the slider 2. Other operations can be the same as those in the first embodiment.

FIG. 6 is a front sectional view showing a fourth embodiment of the pressing apparatus according to the present invention. In this embodiment, a configuration using an eccentric shaft instead of the crankshaft used in the first embodiment is used . A perspective sectional view showing the structure of the main part is shown in FIG. 7, and the structure of the eccentric shaft is shown in FIG . As the operation, almost the same operation as in the first embodiment can be performed .

FIG. 9 is a front sectional view showing a fifth embodiment of the pressing apparatus according to the present invention. In this embodiment, an eccentric shaft is used instead of the crankshaft used in the third embodiment. As the operation, almost the same operation as in the first embodiment can be performed .

In the above-described embodiment, the example in which the support body 3 and the support drive body 5 are formed in a circular cross section such as a cylindrical shape or a partial spherical shape in which a part of a spherical body is removed has been described. It is not necessary to have a shape, and the same effect can be obtained by omitting the shape other than the main stress-bearing portion and forming a partially curved surface (for example, providing flat portions on the left and right sides of the support driving body 5). .

Although the above embodiment has been described as all 1 point press apparatus, a plurality of eccentric rotating shaft in parallel to the one of the press, connecting the support rod and conversion unit for each axis it is also possible to suitably apply the present invention even for multipoint press.

The press device according to the present invention is configured to convert the rotational motion of the crankshaft and eccentric shaft into a reciprocating linear motion and transmit it to the slider 2 by a combination of the support drive body 5 and the support body 3 without using a connecting rod. The apparatus can be lowered in height, and the position of the slider can be adjusted by adjusting the length of the connecting portion 8 that connects the slider and the support 3 .

Further, since the supporting and drive member 5 and the bearing body 3 is configured to be in surface contact with the arc-shaped curved surface, it is possible to reduce by dispersing stress concentration, long life and high accuracy of this by a press device Can be realized. As described above, according to the present invention, it is possible to greatly contribute to downsizing, long life, and high accuracy of the press device.

It is front sectional drawing which shows the 1st Example of the press apparatus by this invention. FIG. 2 is a perspective sectional view showing a main part of the first embodiment shown in FIG. 1. It is a perspective view which shows the structure of the crankshaft used for the 1st Example shown in FIG. It is front sectional drawing which shows the 2nd Example of the press apparatus by this invention. It is front sectional drawing which shows the 3rd Example of the press apparatus by this invention. It is front sectional drawing which shows the 4th Example of the press apparatus by this invention. FIG. 7 is a perspective sectional view showing a main part of the fourth embodiment shown in FIG. 6. It is a perspective view which shows the structure of the eccentric shaft used for the 4th Example shown in FIG. It is front sectional drawing which shows the 5th Example of the press apparatus by this invention.

DESCRIPTION OF SYMBOLS 1 Frame 2 Slider 3 Bearing body 4 Bearing cavity 5 Support drive body 6 Outer peripheral surface 7 Eccentric shaft 8 Connection part 11 Drive shaft 12 Transmission shaft 13 Connection plate

Claims (4)

Having a slider and a support body slidably arranged in the vertical direction within the frame;
The support is housed in the slider guided and supported by the frame;
The slider and the support body slide integrally with respect to the vertical direction via a connecting portion,
The connecting portion is configured to be capable of adjusting a distance between the slider and the support body,
The bearing body has a bearing cavity having a circular arc-shaped cross section formed in a direction perpendicular to the sliding direction of the slider and the bearing body,
In the bearing cavity, a support drive body having an outer peripheral surface having an arcuate cross-sectional shape in sliding contact with the inner peripheral surface of the bearing cavity is rotatably supported,
The support drive body has an eccentric rotation shaft that is arranged in parallel with the rotation axis of the support drive body and performs eccentric rotation about an eccentric shaft that is disposed at a position displaced with respect to the rotation axis of the support drive body. Support ,
The eccentric shaft is disposed at a position displaced in the horizontal direction with respect to the center line AA ′ of the support drive body passing through the rotation center of the support drive body and along the sliding direction of the support body. Press apparatus characterized by comprising Te. Claims wherein the support drive member is formed in a cylindrical shape, wherein the inner circumferential surface of the bearing cavity is formed in a cylindrical shape having an inner peripheral surface having substantially the same curvature as the cylindrical surface of the support and drive member The press apparatus according to 1 . The support driving body is formed in a partial spherical shape obtained by cutting a part of a sphere, and an inner peripheral surface of the support cavity is formed in a partial spherical shape having an inner peripheral surface having substantially the same curvature as the sphere. The press apparatus according to claim 1 . Press device according to any one of claims 1 to 3, wherein the eccentric rotary shaft, characterized in that it is a crankshaft or eccentric shaft.