KR20150071979A - Clamping pressure control apparatus of steady rest for machine tool and method thereof - Google Patents

Abstract

The present invention relates to a clamping pressure control apparatus of a vibration dampener for a machine tool and a method thereof. According to the present invention, the length and pressure of a clamping part is adjusted to allow the optimal clamping of a workpiece in accordance with the diameter, length, thickness, and material variations of the workpiece in a single vibration dampener, thereby improving processing quality. In addition to this, the present invention allows productivity improvement by allowing a worker to process a workpiece without replacing a vibration dampener in accordance with the change of the workpiece and reducing a time for replacing the vibration dampener; and reduces a production cost of a machine tool without the installation of multiple vibration dampener.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamping pressure control apparatus for a machine tool,

The present invention relates to a clamping pressure regulating device and method for controlling a clamping pressure for a machine tool, and more particularly, to a clamping pressure regulating device for a clamping pressure regulator for a machine tool, It improves the quality of work by adjusting the length of the clamping part and the pressure of the clamping part so that it can be clamped, and it is not necessary to replace the work piece with the dustproof tool which is suitable for the working material according to the change of the working material. And more particularly, to a clamping pressure control device and method for controlling a clamping force for a machine tool.

A wide range of machine tools, including turning centers, machining centers, doormat machining centers, swiss turns, electric discharge machines, horizontal NC boring machines and CNC lathes, are widely used in a variety of industrial applications to suit their application.

In general, steady rest refers to a device that prevents the workpiece from being shaken by vibration when machining a workpiece (workpiece) having a long length on a turning center or a CNC lathe.

When the length of the workpiece is less than the predetermined length, the workpiece is fixed to a certain extent by the tailstock, thereby preventing an error caused by vibrations occurring in the workpiece at the time of machining.

However, when the length of the workpiece is longer than the predetermined length, the workpiece is shaken by the vibration generated in the tool at the time of machining, even when the workpiece is fixed to the cardiac pressure, thereby causing a machining error of the workpiece, .

Therefore, in order to solve such a problem, in the case of turning of a workpiece having a length greater than or equal to a predetermined length, a spindle is provided in addition to a tailstock so as to prevent the workpiece from shaking during machining.

Fig. 1 shows a conceptual view of a machine tool 1 having a conventional dustbin. As shown in Fig. 1, a bed 2 is installed on the ground. A guide rail 3 is formed on one surface of the bed 2. The transfer unit 4 moves horizontally along the guide rail 3. [ A bracket (5) is provided on a part of the transfer unit (4). And an anti-static hole (6) is coupled to a part of the bracket (5). The working material 7 is clamped to the gripper of the discharge opening 6. The discharge opening 6 can be moved horizontally on the bed 2 by the transfer unit 4. [

As shown in FIG. 1, the clamping allowable range of the gripper of the conventional discharge port 6 is determined according to the diameter of the workpiece, and therefore, a plurality of discharge ports having different clamping allowable ranges are required according to the diameter of the workpiece. , There is a problem in that the manufacturing cost and the replacement time of the dust collecting mouth are increased and the production cost of the work product is increased due to the replacement with the dust dirt having the allowable clamping range.

In addition, the clamping pressure of the workpiece in the conventional welding tool is manually adjusted according to the diameter and the thickness of the workpiece, so that it takes a long time to adjust the clamping pressure and it is difficult to control the clamping pressure accurately.

Further, even if the operator adjusts the clamping pressure, the clamping pressure can not be adjusted according to the diameter and the thickness of the workpiece.

Korean Patent Laid-Open Publication No. 10-2013-0064231

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a clamping unit for clamping a workpiece in an optimum state in accordance with diameter, length, thickness, It is possible to improve the quality by adjusting the length and the pressure of the clamping part and it is not necessary to replace the workpiece with the vibration damping tool suitable for the workpiece according to the change of the workpiece, And it is an object of the present invention to provide a clamping pressure regulating device and a regulating method of a dust-proofing tool for a machine tool, which can reduce the manufacturing cost of the machine tool without requiring installation.

In order to accomplish the object of the present invention, there is provided a clamping pressure regulating device for a clamp for a machine tool according to the present invention, the clamping pressure adjusting device comprising: a housing having a discharge port movably installed in a bed by a transfer unit; A pair of guide portions installed to face both sides of the upper portion of the housing; A pair of clamping parts inserted into the pair of guide parts, respectively; A length adjusting unit installed at one side of the guide unit to adjust a length of the pair of clamping units; A clamping pressure generating unit for generating a clamping pressure of the pair of clamping parts; A channel having one end connected to the clamping pressure generating unit and the other end connected to the clamping unit, respectively; And a control unit.

In another preferred embodiment of the clamping pressure regulating device for a machine tool according to the present invention, the length adjusting unit of the clamping pressure regulating device for a vibration damping tool for a machine tool comprises a ball screw inserted into the clamping part; A gear formed at a lower end of the ball screw; A driving unit for generating power for rotating the ball screw; A rotating shaft installed at one side of the driving unit and rotated by a driving force of the driving unit; And a driving gear formed on one side of the rotating shaft so as to be engaged with the gear.

In another preferred embodiment of the clamping pressure regulating apparatus for a machine tool according to the present invention, the control unit of the clamping pressure regulating apparatus for a dustproof tool for a machine tool includes a processing member for storing data on the diameter and length of the workpiece, A shape data storage unit; A work material data storage unit for storing data on a material of the work material; A work material thickness data storage unit for storing data on the thickness of the work material; A clamping pressure maximum value storing part for storing a maximum value of the clamping pressure for the workpiece; A clamping part length calculating part for calculating the length of the clamping part by the diameter and length of the workpiece stored in the workpiece shape data storing part; The clamping pressure generating unit may generate the clamping force in the clamping pressure generating unit based on the material of the working material stored in the working material data storage unit, the thickness of the working material stored in the working material thickness data storage unit, A clamping pressure calculation unit for calculating a clamping pressure; And a signal transmission unit for transmitting a signal indicative of the clamping length calculated by the clamping unit length calculating unit and the clamping pressure calculated by the clamping pressure calculating unit to the length adjusting unit and the clamping pressure generating unit .

According to another aspect of the present invention, there is provided a clamping pressure adjusting method for a clamping tool for a machine tool, comprising: storing data on a diameter and a length of a workpiece in a workpiece shape data storage; Storing data on a material of the work material in a work material data storage unit; Storing data on a thickness of the workpiece in a workpiece thickness data storage unit; Storing a maximum value of a clamping pressure for the workpiece in a clamping pressure maximum value storing portion; Adjusting a length of the clamping portion with a length adjusting unit according to a length of the clamping portion calculated by the clamping portion length calculating portion; And clamping the workpiece by generating a clamping pressure in the clamping pressure generating unit according to the clamping pressure calculated by the clamping pressure calculator.

The clamping pressure regulating device and the adjusting method of the clamping pressure for a machine tool according to the present invention are characterized in that in a single clamping part, The length and the pressure of the clamping portion are adjusted to minimize the deformation of the workpiece and improve the machining quality.

Further, according to the clamping pressure adjusting device and the adjusting method of the clamping part for a machine tool according to the present invention, it is not necessary to replace the clamping part of the clamping part of the clamping part with the anti- As a result, it is possible to improve the productivity by reducing the time required for replacing the discharge port and adjusting the pressure of the clamping portion.

Further, according to the clamping pressure adjusting device and the adjusting method of the present invention, it is not necessary to manufacture a plurality of clamping holes, thereby reducing the overall manufacturing cost of the machine tool.

1 is a conceptual view of a conventional machine tool having a dustproof mouth.
2 is a conceptual diagram of a clamping pressure regulating device for a vibration damping tool for a machine tool according to a preferred embodiment of the present invention.
3 is a conceptual diagram of a state in which the length of a clamping unit is minimized in a clamping pressure regulating apparatus for a vibration damping tool for a machine tool according to a preferred embodiment of the present invention.
4 is a conceptual diagram of a state in which the length of a clamping part is maximized in a clamping pressure regulating device for a vibration damping tool for a machine tool according to a preferred embodiment of the present invention.
5 is a flow chart of a clamping pressure control method for a vibration damping tool for a machine tool according to a preferred embodiment of the present invention.

Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, like reference numerals are used to refer to like elements throughout.

FIG. 2 is a conceptual diagram of a clamping pressure regulating device for a vibration damping clamp for a machine tool according to a preferred embodiment of the present invention, and FIG. 3 is a schematic view of a clamping pressure regulating device for a damper for a machine tool according to a preferred embodiment of the present invention And FIG. 4 is a conceptual diagram of a state in which the length of the clamping unit is maximized in a clamping pressure regulating apparatus for a vibration damping tool for a machine tool according to a preferred embodiment of the present invention. Referring to FIGS. 2 to 4, a clamping pressure adjusting apparatus 100 for a vibration damping tool for a machine tool according to a preferred embodiment of the present invention will be described. 2, a clamping pressure adjusting apparatus 100 for a vibration damping tool for a machine tool according to a preferred embodiment of the present invention includes a housing 10, a guide portion 20, a clamping portion 30, (40), a clamping pressure generating unit (50), a flow path (60), and a control unit (70).

The housing (10) forms the overall contour of the discharge opening (6). Although not limited thereto, the housing 10 may include a detachable cover, and a guide portion, a clamping portion, a length adjusting unit, a flow path, and the like, which will be described later, are installed between the housing and the cover. Although not shown in the drawing, the dust-tightening opening 6 is connected to the conveying unit by a connecting member such as a bracket, and the conveying unit is horizontally moved on the bed. Accordingly, the dust-tightening opening can be moved horizontally by the transfer unit in the machine tool.

A pair of guide portions 20 are provided on both sides of the upper portion of the housing 10 so as to face each other. According to a preferred embodiment of the present invention, the guide portion 20 may be formed in a U shape.

A pair of clamping portions 30 are inserted into the pair of guide portions 20, respectively. According to a preferred embodiment of the present invention, a pair of clamping portions 30 are provided with a hollow portion inside thereof, and the upper ends of the pair of clamping portions 30 are bent And a roller 31 for minimizing the friction with the workpiece on one side.

The length adjusting unit 40 is installed on one side of the guide portion 20 which is the inside of the housing 10 to adjust the length of the pair of clamping portions 30. The length of the clamping portion 30 is adjusted by the signal transmitted from the signal transmission portion 77 of the control portion 70, which will be described later, by the pair of clamping portions 30 rising or falling depending on the diameter of the workpiece.

A clamping pressure generating unit 50 is provided at a lower portion of the housing 10 to generate a clamping pressure of the pair of clamping portions 30. According to a preferred embodiment of the present invention, the clamping pressure generating unit 50 is formed of a hydraulic servo motor. A clamping pressure is differently formed in the clamping pressure generating unit 50 according to the material and the thickness of the work material by the signal transmitted from the signal transmitting unit 77 of the control unit 70 to be described later, The clamping portion 30 is operated to maintain the clamping pressure in the optimum condition.

One end of the flow path 60 is connected to the clamping pressure generating unit 50 and the other end of the flow path 60 is connected to the clamping unit 30. The oil passage 60 transfers the hydraulic pressure discharged from the clamping pressure generating unit 50 to the clamping unit 30 so that the clamping unit 30 can be machined by a force having a pressure discharged from the clamping pressure generating unit 50 The material is clamped or unclamped.

The control unit 70 is installed in a part of the machine tool. According to a preferred embodiment of the present invention, the control unit 70 may be installed in a part of the CNC operator's machine of the machine tool.

2 to 4, according to another preferred embodiment of the present invention, the length adjusting unit 40 of the clamping pressure regulating device 100 of the vibration damping tool for a machine tool includes a ball screw 41, A gear 42, a driving portion 43, a rotating shaft 44, and a driving gear 45. [ 2 to 4, a length adjusting unit 40 of a clamping pressure adjusting apparatus 100 for a turbine for a machine tool according to another preferred embodiment of the present invention will be described.

The ball screw 41 is inserted into the hollow portion of the clamping portion 30 so as to be connected to a part of the clamping portion 30.

A gear 42 is formed at the lower end of the ball screw 41.

The driving unit 43 generates power for rotating the ball screw 41. [ According to an embodiment of the present invention, the driving unit 43 may be formed of a servo motor.

The rotating shaft 44 is installed on one side of the driving unit 43. The rotating shaft 44 is rotated by the driving force of the driving unit 43. But the rotation shaft 44 may be formed integrally with the driving unit 43. [

And is formed on one side of the rotating shaft 44 so that the driving gear 45 is gear-engaged with the gear 42. The driving gear 45 may be integrally formed with the rotating shaft 44, though not necessarily limited thereto.

2 to 4, according to another preferred embodiment of the present invention, the control unit 70 of the clamping pressure regulating apparatus 100 of the vibration damping tool for a machine tool includes a machining work shape data storage unit 71, A working material thickness data storage section 73, a clamping pressure maximum value storage section 74, a clamping section length calculation section 75, a clamping pressure calculation section 76, (77).

Data on the diameter and length of various workpieces to be machined are stored in the machining machining shape data storage section 71. [

The material data storage 72 stores data on materials of various materials to be processed. For example, the material of the working material is divided into soft iron, soft steel, cast steel, nickel steel, cast iron, copper, brass and aluminum, and elastic modulus corresponding to each material is stored together in the working material material data storage 72.

Data on the thickness of various workpieces to be machined are stored in the machining material thickness data storage part 73. [ When calculating the clamping pressure of the clamping part 30, the thickness of the workpiece itself must be taken into consideration. If this is not taken into account, the surface of the workpiece may be deformed by the clamping pressure and defective products may be generated.

The maximum value of the clamping pressure of the workpiece is stored in the ramping pressure maximum value storage section 74. [ This is because even if the clamping pressure is adjusted to an optimal state depending on the workpiece, if too large a clamping pressure is applied, the workpiece may be deformed. When the clamping pressure of the clamping part 30 acts as a clamping pressure maximum value of the workpiece, the clamping part 30 of the dustproofing tool is unclamped.

The clamping part length calculating section 75 calculates the length of the optimum clamping section 30 by the diameter and the length of the workpiece to be processed stored in the workpiece shape data storing section 71. [

 The clamping pressure calculation unit 76 calculates the clamping pressure of the work material stored in the work material data storage unit 72 and the thickness of the work material stored in the work material thickness data storage unit 73 and the clamping pressure maximum value storage unit 74 And calculates an optimum clamping pressure to be generated in the clamping pressure generating unit 50 by the stored clamping pressure maximum value.

The signal transmission unit 77 transmits the clamping length calculated in the clamping unit length calculation unit 75 and the clamping pressure signal calculated in the clamping pressure calculation unit 76 to the length adjustment unit 40 and the clamping pressure generation unit 50). According to a preferred embodiment of the present invention, such a signal may be formed in an M-CODE form.

2 to 4, the operating principle in which the length of the clamping portion 30 is adjusted by the length adjusting unit 40 and the clamping pressure of the clamping portion 30 are adjusted by the clamping pressure generating unit 50 The operation principle is explained.

The driving unit 43, that is, the servomotor, receives the length signal of the clamping unit calculated by the clamping unit length calculation unit 75 of the control unit 70 from the signal transmission unit 77 and is driven. By the drive of the servo motor, the rotary shaft 44 rotates, and accordingly, the drive gear 45 rotates. The rotation of the driving gear 45 rotates the gear 42 installed to be engaged with the driving gear 45. The length of the clamping portion 30 is adjusted by raising or lowering the clamping portion 30 along the guide portion 20 as the ball screw rotates in accordance with the rotation speed of the gear 42.

The thickness of the working material stored in the working material thickness data storage section 73 and the clamping pressure maximum value stored in the clamping pressure maximum value storage section 74 stored in the working material material data storage section 72, The clamping pressure calculation unit 76 calculates the optimum clamping pressure to be generated in the pressure generating unit 50. [

The clamping pressure generating unit 50 is driven by a hydraulic servomotor receiving the clamping pressure signal calculated by the clamping pressure calculating unit 76 from the signal transmitting unit 77. The operating fluid having the clamping pressure calculated by the operation of the clamping pressure generating unit 50 is transmitted to the pair of clamping portions 30 through the flow path 60. [ The working oil having the calculated clamping pressure causes the clamping portion 30 to clamp the workpiece to the optimum clamping pressure.

5 is a flow chart of a clamping pressure control method for a vibration damping tool for a machine tool according to a preferred embodiment of the present invention. As shown in FIG. 5, the clamping pressure adjusting method of a vibration damping tool for a machine tool according to the preferred embodiment of the present invention includes a step S 1 of storing work shape data, a step S 2 of storing work material data, A data storing step S4, a clamping pressure maximum value storing step S5, a clamping part length adjusting step S6, and a workpiece clamping step S7.

And stores the data on the diameter and the length of the workpiece material in the processed workpiece shape data storage unit 71. [

After the processed work shape data storing step (S1), data on the material of the work material is stored in the work material data storage 72. [

After the processing material material data storage step (S2), data on the thickness of the workpiece material is stored in the processing material thickness data storage unit 73. [

After the work material thickness data storing step (S3), the maximum value of the clamping pressure for the workpiece is stored in the clamping pressure maximum value storage section (74).

After the clamping pressure maximum value storing step S4, the signal of the length of the clamping part 30 calculated by the clamping part length calculating part 75 is transmitted from the signal transmitting part 77 to the length adjusting unit 40, The length of the clamping portion 30 is adjusted by the length adjusting unit 40 according to the length signal of the clamping portion 30 transmitted.

After the clamping part length adjustment step S6, the clamping pressure signal calculated by the clamping pressure calculation part 76 is transmitted from the signal transmission part 77 to the clamping pressure generation unit 50, and the signal of the clamping pressure The clamping pressure generating unit 50 generates a clamping pressure to clamp the workpiece.

The clamping pressure adjusting device and the adjusting method of the clamping pressure for the machine tool according to the present invention are characterized in that the clamping pressure adjusting device and the adjusting method of the clamping pressure clamping device of the present invention for clamping the workpiece in an optimum state according to the diameter, It is possible to improve the machining quality by adjusting the length of the part and the pressure of the clamping part, and it is not necessary to replace the work piece with the anti-vibration part suitable for the work piece according to the change of the work piece, The manufacturing cost of the machine tool can be reduced.

Furthermore, the present invention is not limited to the modifications shown in the drawings and the embodiments described above, but can be extended to other embodiments falling within the scope of the appended claims.

1: machine tool, 2: bed,
3: guide rail, 4: conveying unit,
5: bracket, 6:
7: Working material, 10: Housing,
20: guide portion, 30: clamping portion,
31: roller, 40: length adjusting unit,
41: ball screw, 42: gear,
43: driving unit, 44: rotating shaft,
45: driving gear, 50: clamping pressure generating unit,
60: flow path, 70: control section,
71: pore forming material shape data storage unit,
72: material of work material data storage part,
73: Workpiece thickness data storage section,
74: Clamping pressure maximum value storage part,
75: clamping part length calculating part, 76: clamping pressure calculating part,
77: Signal transmission unit, 100: Clamping pressure regulator.

Claims (4)

1. A machine tool comprising a discharge port movably installed in a bed by a transfer unit,
housing;
A pair of guide portions installed to face both sides of the upper portion of the housing;
A pair of clamping parts inserted into the pair of guide parts, respectively;
A length adjusting unit installed at one side of the guide unit to adjust a length of the pair of clamping units;
A clamping pressure generating unit for generating a clamping pressure of the pair of clamping parts;
A channel having one end connected to the clamping pressure generating unit and the other end connected to the clamping unit, respectively; And
And a control unit for controlling the clamping pressure of the vibration damping unit for a machine tool.
The method according to claim 1,
The length-
A ball screw inserted into the clamping portion;
A gear formed at a lower end of the ball screw;
A driving unit for generating power for rotating the ball screw;
A rotating shaft installed at one side of the driving unit and rotated by a driving force of the driving unit; And
And a driving gear formed on one side of the rotating shaft so as to be engaged with the gear.
3. The method of claim 2,
Wherein,
A workpiece shape data storage unit for storing data on the diameter and length of the workpiece;
A work material data storage unit for storing data on a material of the work material;
A work material thickness data storage unit for storing data on the thickness of the work material;
A clamping pressure maximum value storing part for storing a maximum value of the clamping pressure for the workpiece;
A clamping part length calculating part for calculating the length of the clamping part by the diameter and length of the workpiece stored in the workpiece shape data storing part;
The clamping pressure generating unit may generate the clamping force in the clamping pressure generating unit based on the material of the working material stored in the working material data storage unit, the thickness of the working material stored in the working material thickness data storage unit, A clamping pressure calculation unit for calculating a clamping pressure; And
And a signal transmission unit for transmitting a signal indicative of a clamping length calculated by the clamping unit length calculating unit and a clamping pressure calculated by the clamping pressure calculating unit to the length adjusting unit and the clamping pressure generating unit. A clamping pressure regulator for an anti - vibration tool for machine tools.
Storing data on the diameter and length of the workpiece in the workpiece shape data storage;
Storing data on a material of the work material in a work material data storage unit;
Storing data on a thickness of the workpiece in a workpiece thickness data storage unit;
Storing a maximum value of a clamping pressure for the workpiece in a clamping pressure maximum value storing portion;
Adjusting a length of the clamping portion with a length adjusting unit according to a length of the clamping portion calculated by the clamping portion length calculating portion; And
And clamping the workpiece by generating a clamping pressure in the clamping pressure generating unit according to the clamping pressure calculated by the clamping pressure calculating unit.

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