JP2002137106A - Holding device for grinding and polishing tool for machine tool in machining center - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool holding device enabling grinding and polishing in machining center and milling cutter machine tool controlled numerically and manually. SOLUTION: A cylindrical body 1 provided with a machine tool mounting basic part is provided with a tool mounting part 2 capable of mounting a grinding and polishing tool A in such a way that it can freely advance and retract in the direction of rotary shaft and can turn together with the basic part, and a drag mechanism part 3 for imparting an energizing force in the direction resistant to retraction operation of the grinding and polishing tool is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining center defined as a numerically controlled machine which uses a plurality of rotating tools, has an automatic tool changing mechanism, and performs various types of machining without changing tools, and other rotary centers. It is related to a holding tool used when attaching a grinding tool and a polishing tool as a rotary tool used in a numerically controlled machine tool and a manually controlled machine tool that manually perform tool change using a tool to the machine. is there.

[0002]

2. Description of the Related Art Rotary tools used for numerically controlled or manually controlled machine tools such as machining centers include drills for drilling, taps for screw formation, milling for plane cutting, and three-dimensional cutting. In addition, the base (axial state) of the tool is mounted on a holder (via a collect chuck) that is connected and fixed to the relevant portion of the machine tool by end milling or the like for two-dimensional shape cutting.

[0003] Grinding and polishing after cutting by a numerically controlled machine tool or a manually controlled machine tool are not implemented. An existing grinding tool and polishing tool known as a tip part used for a hand-held electric tool or an air tool provided with a grinding stone b, a wire brush c, a buff d, etc. Even if employed in the same manner, desired grinding and polishing cannot be realized as it is. That is, the numerical control program is to set the selection and operation of the type of the rotary tool in advance in accordance with the processing shape of the workpiece, and to mount the above-described existing grinding tool or polishing tool in place of the conventional cutting tool. This is because even if used, it is not possible to strictly control the wear amount of the grinding portion and the polishing portion during the program operation. Further, in the manual control, the control is based on mere visual measurement, and it is difficult to perform the polishing operation at a constant pressure required for the polishing operation.

Accordingly, the present invention proposes a holder for a grinding tool or a polishing tool which can be used for a milling type numerically controlled machine tool such as a machining center or a manually controlled machine tool.

[0005]

According to the present invention, a holder for a grinding and polishing tool for a machine tool such as a machining center according to the present invention is provided with a main body having a machine tool mounting base so that the grinding and polishing tool can be freely advanced and retracted in the direction of the rotation axis. In addition, a tool mounting portion that can be mounted in a co-rotating state with the base portion is provided, and a drag mechanism portion that applies a biasing force in a direction against the retreating operation of the grinding and polishing tool is additionally provided.

Accordingly, a grinding tool or a polishing tool is mounted on the holder of the present invention, and the holder of the present invention is mounted on a predetermined portion of a milling machine tool so that a grinding portion or a polishing portion at the tip of the tool is formed on a portion to be processed. When the machine tool is operated on the basis of a position where it comes into contact and retracts somewhat, the grinding unit or the polishing unit comes into contact with the workpiece with a predetermined urging force, and the grinding or polishing is performed. Even if the used tool wears out during the program operation or manual control operation, or if the program operation position does not match the workpiece shape, if the tool movement of the holder is within the allowable range of the tool Since it advances (retreats) and comes into contact with the surface to be machined, wear of the tool used and displacement of the operating position do not hinder the operation.

[0007]

Next, an embodiment of the present invention will be described. Grinding and polishing tool A to which the holder of the embodiment is applied
Is a known type provided with a grinding and polishing portion such as a grindstone b, a wire brush c, and a buff d at the tip of the shaft portion a. In particular, a receiving recess e is provided near the base end of the shaft portion a. The holder is used to select a tool to be used according to the type of machining.

[0008] The holder shown in the embodiment applied to the above-mentioned tool to be used comprises a tubular body (base) 1, a tool mounting part 2 and a drag mechanism 3.

The tubular body 1 has an outer diameter and a length that can be mounted on a collet chuck mechanism incorporated in a holder of a machine tool, a tubular body having a closed lower end and an open upper end, and an internal space 11. A shaft hole 12 through which the shaft portion a of the tool A to be used is inserted is provided on the lower end surface, a screw portion 13 is engraved on the inner surface of the upper end opening portion, and a vertically long hole 1 penetrating through the internal space 11 on the side surface.
4 is provided.

The tool mounting part 2 is a sleeve (receiving part) 21
And a stopper pin 22. The sleeve 21 can be housed in the internal space 11 of the tubular body 1, and has a longitudinal axis hole 23 through which the shaft portion a of the tool A is inserted, and a shaft hole from the peripheral surface. 23 is provided with a threaded hole 24 penetrating therethrough. The stop pin 22 is screwed into the screw hole 24 of the sleeve 21, and at the time of screwing, the distal end corresponds to the receiving concave portion e of the tool A, and the protrusion on the proximal end side is smaller than the wall thickness of the vertically long hole 14. It was done.

The drag mechanism 3 includes a spring 31 and a lid 3.
The spring 31 is a compression spring that can be housed in the internal space 11 of the tubular body 1 and is interposed between the sleeve 21 and the lid 32.
It is formed so that it can be screwed into the screw portion 13 of the upper end opening of.

To incorporate the tool A into the holder, the sleeve 21 is housed in the internal space 11, the shaft portion a of the tool A is passed through the shaft holes 12 and 23, and the receiving recess e is formed.
And the screw hole 24 are aligned with each other, the stop pin 22 is screwed into the screw hole 24 from the vertically long hole 14, and the tip of the stop pin 22 is received in the recess e.
And the stopper pin 22 is set in a non-projecting state from the elongated hole 14. Further, the spring 31 is inserted from the upper end opening of the cylindrical body 1, and the opening of the main body is closed by the lid 32.

After the tool to be used is incorporated in the holder as described above, the cylindrical body (base) 1 is moved to a predetermined position of the machine tool via a collet chuck mechanism (consisting of a collet B and a holder C). It is used by attaching to The tool A (having the whetstone part b) has a strokeable distance of about 7.8 mm when the holder is attached, and the urging force (repulsive force) of the spring 31 is an initial pressing force 197.
g, a design value of about 370 g of maximum pressing force.

When inputting numerical values for the operation control of the machine tool, the position of the tool tip (the distance from the chuck portion to the work surface D) is set to a numerical value obtained by retracting the grindstone portion b in advance. Then, when the machine tool operates, the grinding wheel portion b comes into contact with the work surface D in a retracted state, and the tool A and the entire holder are integrally rotated to perform grinding or polishing of the work surface D.
In particular, even if the whetstone surface of the whetstone portion b is worn out or there is an operation position defect due to a program operation or a manual control operation, the entire used tool A mounted on the holder is pressed and advanced in the direction of the work surface D. Since it is free, the grindstone portion b is always in contact with the work surface D, and grinding and polishing can be continued. Therefore, it is possible to perform a grinding or polishing operation with a milling machine tool of numerical control or manual control. Of course, the same pressing process can be realized by using a tool having a wire brush c or a buff d in place of the tool A having the whetstone portion b.

It should be noted that the present invention is applicable to any structure having a function of allowing a tool (grinding tool, polishing tool) to move back and forth in the direction of the rotation axis, a function of co-rotating with a base, and a function of pressing a work surface. It is not limited to the embodiment. In particular, the pressing function may employ another mechanism such as a magnetic function or a pneumatic mechanism instead of the spring.

Further, the concave portion e provided in the shaft portion a of the tool to be used (grinding tool, polishing tool) needs to be provided in advance when the shaft portion a is formed of a soft material such as aluminum. Absent. It is sufficient that a depression is formed by pressing the stop pin 22 and the stop pin 22 and the shaft portion a are connected.

[0017]

As described above, according to the present invention, the main body provided with the machine tool mounting base is provided with the tool mounting portion capable of freely moving the grinding and polishing tool in the direction of the rotation axis and mounting the tool in a co-rotating state with the base. In addition, a holding tool provided with a drag mechanism that applies a biasing force in the direction against the retreating operation of the grinding and polishing tool, incorporating various types of grinding tools and polishing tools depending on the application, numerical control and This enables grinding and polishing with a manually controlled milling machine tool.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a tool to be used according to the embodiment of the present invention.

FIG. 3 is a sectional view after the tool is assembled.

FIG. 4 is an explanatory diagram of the same use state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical body (base part) 11 Internal space 12 Shaft hole 13 Screw part 14 Longitudinal hole 2 Tool mounting part 21 Sleeve 22 Stop pin 23 Vertical axis hole 24 Screw hole 3 Drag mechanism 31 Spring 32 Lid

Claims (2)

[Claims] 1. A main body having a machine tool mounting base, a tool mounting part capable of freely moving a grinding and polishing tool in the direction of the rotation axis and mounting the grinding and polishing tool in a co-rotating state with the base, and retreating the grinding and polishing tool. A holding tool for a grinding and polishing tool for a machine tool, such as a machining center, comprising a drag mechanism for applying a biasing force in a direction opposing the operation. 2. A grinding and polishing tool provided with a grinding portion and a polishing portion at a tip of a shaft portion, a main body having a cylindrical body, and a receiving portion connected to the shaft portion of the grinding and polishing tool in the cylindrical body. 2. A machine tool such as a machining center according to claim 1, wherein a compression spring or other urging force generating member is interposed between the receiving portion and the lid at the base end of the cylindrical body inside the cylindrical body so as to be freely reciprocated. Holder for grinding and polishing tools.