EP3590621A1

EP3590621A1 - Die cam unit provided with auxiliary return device

Info

Publication number: EP3590621A1
Application number: EP17866374.6A
Authority: EP
Inventors: Yoon Sun Lee
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-03-03
Filing date: 2017-03-03
Publication date: 2020-01-08
Also published as: WO2018159884A1; EP3590621A4

Abstract

Disclosed is a mold cam unit having an auxiliary return device, and more particularly, to a mold cam unit in which an auxiliary return device is additionally provided to a cam slider and a cam driver to ensure efficient return movement of the cam slider, resulting in increased operational efficiency. The mold cam unit includes: a cam base (20) including a slide portion formed in an installation space defined in a lower portion of a box-shaped body; a cam slider (30) located in the space of the cam base (20) and including therein a return spring (32) so as to reciprocatingly move along the slide portion; a cam driver (40) including a slide plate (41) mounted on an upper surface thereof to guide a lower slide groove (31) in the cam slider (30) to enable movement of the cam slider (30); a pressure member (50) provided on a lower surface of the cam slider (30) and including a downwardly bent pressure surface (51); and the auxiliary return device (60) provided on a side surface of the cam driver (40) that faces the pressure surface (51) and configured to come into contact with the pressure surface (51) via forward movement of the cam slider (30), thereby being elastically compressed.In addition, the cam slider (30) includes a positioning recess (33) formed in the lower surface thereof, and the pressure member (50) includes a positioning protrusion (52) formed on one surface thereof, which is in close contact with the lower surface of the cam slider (30). The cam driver (40) may include an installation hole (42) formed in the side surface thereof, into which the auxiliary return device (60) is inserted, and a separation-preventing piece (43) fixedly provided on an outer wall surface thereof to prevent separation of the auxiliary return device (60).In addition, the auxiliary return device (60) includes a housing (61) including one side surface formed with a passage hole and a remaining side surface that is open, a push member (62) including a push surface (62a) formed on one side thereof so as to be located in the passage hole (61a) in the housing (61) and configured to be guided so as to move along an inner space of the housing (61), a cover (63) configured to close the remaining side surface of the housing (61), and an elastic member (64) located between the push member (62) and the cover (63).

Description

[Technical Field]

The present invention relates to a mold cam unit having an auxiliary return device, and more particularly, to a mold cam unit in which an auxiliary return device is additionally provided to a cam slider and a cam driver to ensure efficient return movement of the cam slider, resulting in increased operational efficiency.

[Background Art]

In general, a mold cam unit is mounted to a press mold to change the operating direction of vertical reciprocating motion so as to enable angular motion. As illustrated in FIG. 1, a cam slider 3 is mounted on the lower surface of a box-shaped cam base 1 so as to be slidable in the longitudinal direction, a spring groove 6, into which a return spring 5 may be inserted, is formed in the cam slider 3, and a cam driver 7 is provided thereunder.
In the cam unit configured as described above, as illustrated in FIG. 2, when the entire cam base 1 moves downwards, a slide groove 8, which is formed in the lower surface of the cam slider 3, is guided to move along a slide plate 9, which is provided on the upper surface of the cam driver 7, so that the return spring 5 is elastically compressed. Then, the cam slider 3 further moves forwards so that a punching pin 16 punches a panel, which is fixedly mounted on a jig 14.
However, in the conventional cam unit described above, a punch, which has completed a punching operation on a panel product, is configured to return in an opposite direction only by the elasticity of the return spring. Therefore, in a panel such as a high-tension steel plate having increased tensile strength and a panel having increased thickness, the resistance between the punching pin and the panel is increased, thus stopping return movement of the cam slider.
Therefore, in order to solve the problem described above, a return spring having increased elasticity for the return movement of the cam slider has been used, but such a spring having high elasticity is difficult to mount and fix and may cause accidents when it unintentionally become separated during use.
In addition, in the state in which the return spring exerts high elasticity, the cam slider may not easily move forwards due to the elasticity of the return spring at the time at which the cam slider initially comes into contact with the cam driver, which may cause increased shock force. In addition, even when the cam driver moves forwards later, vertical surface pressure is increased, which may accelerate abrasion of a contact surface and reduce the lifespan of the cam device.

[Disclosure]

[Technical Problem]

Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a mold cam unit, which may be used for a high-tension steel plate or the like, and may minimize friction during movement of a cam slider, thereby ensuring efficient return movement thereof.
It is another object of the present invention to provide a mold cam unit in which an auxiliary return device may be easily mounted to or separated from a cam driver and a spring may be relatively easily replaced for a given pressure force of a cam slider, thereby increasing the convenience of an assembly process and use thereof.

[Technical Solution]

In accordance with the present invention, the above and other objects can be accomplished by the provision of a mold cam unit having an auxiliary return device, the mold cam unit including:
a cam base (20) including a slide portion formed in an installation space defined in a lower portion of a box-shaped body;
a cam slider (30) located in the space of the cam base (20) and including therein a return spring (32) so as to reciprocatingly move along the slide portion;
a cam driver (40) including a slide plate (41) mounted on an upper surface thereof to guide a lower slide groove (31) in the cam slider (30) to enable movement of the cam slider (30);
a pressure member (50) provided on a lower surface of the cam slider (30) and including a downwardly bent pressure surface (51); and the auxiliary return device (60) provided on a side surface of the cam driver (40) that faces the pressure surface (51) and configured to come into contact with the pressure surface (51) via forward movement of the cam slider (30), thereby being elastically compressed.
In addition, the cam slider (30) may include a positioning recess (33) formed in the lower surface thereof, and the pressure member (50) may include a positioning protrusion (52) formed on one surface thereof, which is in close contact with the lower surface of the cam slider (30). The cam driver (40) may include an installation hole (42) formed in the side surface thereof, into which the auxiliary return device (60) is inserted, and a separation-preventing piece (43) fixedly provided on an outer wall surface thereof to prevent separation of the auxiliary return device (60).
In addition, the auxiliary return device (60) may include a housing (61) including one side surface formed with a passage hole and a remaining side surface that is open, a push member (62) including a push surface (62a) formed on one side thereof so as to be located in the passage hole (61a) in the housing (61) and configured to be guided so as to move along an inner space of the housing (61), a cover (63) configured to close the remaining side surface of the housing (61), and an elastic member (64) located between the push member (62) and the cover (63).

[Advantageous effects]

According to the present invention, by additionally providing an auxiliary return device to a mold cam unit, it is possible to efficiently return a cam slider and a punching pin, which have completed a punching operation on a recently used type of panel having increased thickness, such as a high-tension steel plate having increased tensile strength. This may prevent faults of a product and malfunction.
In addition, by increasing the return force only of a section required for a punching operation while causing the mold cam unit to be operable in the same manner as the existing manner, stabilized cam operation is possible, and collision resistance between the cam slider and a cam driver may be reduced, which may lengthen the lifespan of the cam unit.
In addition, since an inner elastic member of the auxiliary return device is replaceable so as to be replaced and used to correspond to various products, such as a high-tension steel plate, it is possible to increase product satisfaction.

[Description of Drawings]

FIG. 1 is a view illustrating the state before a conventional mold cam unit is operated.
FIG. 2 is a view illustrating the state after the conventional mold cam unit is operated.
FIG. 3 is an exploded perspective view of a mold cam unit having an auxiliary return device according to the present invention.
FIG. 4 is a cross-sectional view illustrating the configuration of the auxiliary return device according to the present invention.
FIG. 5 is an enlarged perspective view illustrating a coupling unit of the auxiliary return device according to the present invention.
FIG. 6 is a view illustrating the state in which a cam slider and a cam driver are separated from each other according to the present invention.
FIG. 7 is a view illustrating a movement procedure of the cam slider according to the present invention.
FIG. 8 is a view illustrating a punching operation performed by movement of the cam slider according to the present invention.
FIG. 9 is a view illustrating return movement of the cam slider according to the present invention.

[Best Mode]

A mold cam unit having an auxiliary return device according to the present invention is devised to additionally provide the auxiliary return device to a cam slider and a cam driver so as to ensure efficient return movement of the cam slider, resulting in increased operational efficiency.
Hereinafter, features of the configuration of a mold cam unit having an auxiliary return device according to the present invention will be understood through embodiments that will be described in detail with reference to the accompanying drawings.
The present invention may be modified in various ways and may take various forms, and the embodiments thereof will be described herein in detail. However, the embodiments are not intended to limit the present invention to specific disclosed forms, but should be understood as including all changes, equivalents, and substitutions included in the scope and spirit of the present invention.
Referring to FIGS. 3 to 5 illustrating the mold cam unit according to the present invention in, for example, an exploded perspective view, the mold cam unit broadly includes a cam base 20 in which a slide portion is formed in the installation space defined in the lower portion of a box-shaped body, a cam slider 30, which is located in the space of the cam base 20 and includes therein a return spring 32 so as to reciprocatingly move along the slide portion, and a cam driver 40, which includes a slide plate 41 mounted on the upper surface thereof to guide a lower slide groove 31 in the cam slider 30 to enable movement of the cam slider 30. As such, the mold cam unit is configured to perform a punching operation by changing the direction of vertical reciprocating motion of a press mold.
That is, when the entire cam base 20 moves downwards, the slide groove 31 in the lower surface of the cam slider 30 is guided to move along the slide plate 41 on the upper surface of the cam driver 40, so that the return spring 32 is elastically compressed. Then, the cam slider 30 further moves forwards so that the punching pin 16 punches a panel mounted on the jig 14. Thereafter, the cam unit is separated from the panel in the reverse order of the above-described operation.
In the present invention, the cam unit further includes an auxiliary return device 60 in order to enable the cam slider 30, which has completed a punching operation, to efficiently perform return movement despite resistance between the punching pin 16 and the panel. To this end, a pressure member 50, which includes a downwardly bent pressure surface 51, is provided on the lower surface of the cam slider 30.
The auxiliary return device 60 is provided on the side surface of the cam driver 40 so as to face the pressure surface 51. As the cam slider 30 moves forwards, the auxiliary return device 60 is brought into contact with the pressure surface 51, thereby being elastically compressed.
Here, the cam slider 30 further includes a positioning recess 33 formed in the lower surface thereof, and the pressure member 50 further includes a positioning protrusion 52 formed on one surface thereof, which is in close contact with the lower surface of the cam slider 30. Thereby, when the pressure member 50 comes into close contact with the lower surface of the cam slider 30, the positioning protrusion 52 is engaged into the positioning recess 33 to realize rapid provisional assembly. Then, as a screw member (not illustrated) is fastened through a screw hole (not illustrated), rapid coupling thereof is implemented.
Here, the configuration in which the positioning protrusion 52 and the positioning recess 33 are formed to have a trapezoidal shape so that they are provisionally assembled via insertion along the side surface thereof and are then coupled to each other is included in the scope of the present invention.
In addition, the auxiliary return device 60 mounted on the cam driver 40, as illustrated in FIG. 4, includes a housing 61 having a pipe shape, one side surface of which is bent inwards to form a central passage hole 61a and the other side surface of which is open, a push member 62 having a push surface 62a formed on one side thereof so as to be slidably located in the passage hole 61a in the housing 61, the push member 62 being guided to move along the inner space of the housing 61, a cover 63 configured to close the other side surface of the housing 61, and an elastic member 64 located between the push member 62 and the cover 63.
That is, the auxiliary return device 60 is configured by inserting the push member 62, which has the push surface 62a and is formed with a stepped separation preventing portion 62b, and the elastic member 64 into the housing 61, and thereafter closing the housing 61 with the cover 63. When the elastic member 64 elastically pushes the push member 62 in the leftward direction in the drawing so that the push surface 62a passes through the passage hole 61a and is exposed to the outside of the housing 61, the stepped separation preventing portion 62b is caught by the inner wall of the housing 61, which prevents separation of the push member 62.
In addition, the housing 61 and the cover 63 are coupled to each other using a known structure, such as screw-threads or clips. The cover 63 may be configured so as to be easily separated from the housing 61 to enable easy replacement of the push member 62 and the elastic member 64.
In addition, the configuration in which the elastic member 64 includes stacked or abutted disc springs so that another disc spring may be added in consideration of the punching resistance strength of a panel is included in the scope of the present invention.
In addition, the auxiliary return device 60 configured as described above is inserted into an installation hole 42, which is formed in the side surface of the cam driver 40, and a separation-preventing piece 43 is fixedly provided on the outer wall surface of the cam driver 40 to prevent separation of the auxiliary return device 60.
The separation-preventing piece 43 has a plate shape, and when screw members (not illustrated) provided on opposite sides of the separation-preventing piece are fastened and fixed to the side surface of the cam driver 40, the housing 61 of the auxiliary return device 60 is caught by the central surface of the separation-preventing piece, whereby separation of the auxiliary return device 60 is prevented.
FIGS. 6 to 8 illustrate the sequence of operating the mold cam unit according to the present invention. In the state before a press is operated as illustrated in FIG. 6, a panel to be punched is mounted on the jig 14, or replacement of a punched panel is performed.
In the state in which a panel to be punched is mounted on the jig 14, as illustrated in FIG. 7, when the entire cam base 20 moves downwards, the slide groove 31 in the lower surface of the cam slider 30 is brought into contact with the slide plate 41 on the upper surface of the cam driver 40. Thereafter, when the cam base 20 continuously moves downwards, the cam slider 30 is guided to move in the rightward direction in the drawing, so that the return spring 32 is elastically compressed.
At this time, the pressure surface 51 of the pressure member 50 mounted on the underside of the cam slider 30 is brought into contact with the push surface 62a of the auxiliary return device 60, which protrudes from the side surface of the cam driver 40, thereby causing the push member 62 to move in the same direction as the direction in which the cam driver 30 moves so as to compress the elastic member 64.
Accordingly, as illustrated in FIG. 8, the cam slider 30 moves in the rightward direction in the drawing, so that the punching pin 16, which is provided on the front end of the cam slider, punches the panel mounted on the jig 14. Thereafter, when a punching operation is completed, the cam slider 30 including the punching pin 16 returns in the leftward direction in the drawing.
The return movement of the cam slider 30, as illustrated in FIG. 9, is stably implemented by the elasticity of the elastic member 64 of the auxiliary return device 60 as well as the elasticity of the return spring 32 connected to the cam base 20. Then, considering the following operating sequence, the cam driver 40 and the cam slider 30 are separated from each other as illustrated in FIG. 6, and the punched panel is separated from the cam slider.
Although the most exemplary embodiment of the present invention has been described above, it will be apparent to those skilled in the art that the present invention is not limited thereto and that various modifications are possible without departing from the spirit of the present invention.

Claims

A mold cam unit having an auxiliary return device, the mold cam unit comprising:
a cam base (20) comprising a slide portion formed in an installation space defined in a lower portion of a box-shaped body;

a cam slider (30) located in the space of the cam base (20) and comprising therein a return spring (32) so as to reciprocatingly move along the slide portion;

a cam driver (40) comprising a slide plate (41) mounted on an upper surface thereof to guide a lower slide groove (31) in the cam slider (30) to enable movement of the cam slider (30);

a pressure member (50) provided on a lower surface of the cam slider (30) and comprising a downwardly bent pressure surface (51); and

the auxiliary return device (60) provided on a side surface of the cam driver (40) that faces the pressure surface (51) and configured to come into contact with the pressure surface (51) via forward movement of the cam slider (30), thereby being elastically compressed.
The mold cam unit according to claim 1, wherein the cam slider (30) comprises a positioning recess (33) formed in the lower surface thereof, and the pressure member (50) comprises a positioning protrusion (52) formed on one surface thereof, which is in close contact with the lower surface of the cam slider (30).
The mold cam unit according to claim 2, wherein the cam driver (40) comprises:
an installation hole (42) formed in the side surface thereof, into which the auxiliary return device (60) is inserted; and

a separation-preventing piece (43) fixedly provided on an outer wall surface thereof to prevent separation of the auxiliary return device (60).
The mold cam unit according to claim 1, wherein the auxiliary return device (60) comprises:
a housing (61) comprising one side surface formed with a passage hole and a remaining side surface that is open;

a push member (62) comprising a push surface (62a) formed on one side thereof so as to be located in the passage hole (61a) in the housing (61) and configured to be guided so as to move along an inner space of the housing (61);

a cover (63) configured to close the remaining side surface of the housing (61); and

an elastic member (64) located between the push member (62) and the cover (63).