JPH0567450U - Grinding machine for inner surface of machine tool spindle - Google Patents

Abstract

(57) [Summary] [Purpose] The product of the present invention can be attached to the table of a machine tool, and the inner surface can be repaired without removing the spindle for re-grinding from the machine tool. [Structure] Above a base 1 having a mounting hole 1a, a grinder main body 2 having a frame body portion 2b that stands upright is provided, and inside the frame body portion 2b is a grindstone base 4 that moves vertically. A guide frame 3 for guiding it is provided internally, and a rotating spindle 10 having a grinding wheel 11 attached to the tip thereof is mounted on the grinding wheel base 4. In addition, the spindle
Insert the angle adjustment screw 15 for adjusting the angle of 11 into the frame
Install on the side of 2b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a spindle inner surface grinding machine for a machine tool, which can be attached to a table of a machine tool and whose inner surface can be repaired without removing a spindle for re-grinding from the machine tool.

[0002]

[Prior Art]

 Conventional machine tool spindle inner surface grinding machines require high precision, are often large and expensive, and require skillful techniques for repair work. For this reason, when repairing a damaged spindle of a machine tool, it is common to remove the spindle from the machine tool and bring it to the repair manufacturer one by one without requesting repairs at the site to request repair. .. Therefore, there was no simple grinder that could repair the inner surface of the spindle on site.

[0003]

[Problems to be solved by the device]

 When repairing a damaged spindle of the machine tool, it is necessary to bring it to a repair maker and then repair it. Therefore, the repair period becomes longer and the repair cost becomes higher. Further, during this period, the machine tool is stopped, and in particular, stopping a high-priced machine such as an NC machine tool for a long time causes a great loss.

The present invention is to provide a spindle inner surface grinding machine of a working machine capable of easily repairing the damage on the inner surface of the spindle for anyone in the field.

[0005]

[Means for Solving the Problems]

 The present invention has been made in order to eliminate the above problems, that is, a base having a mounting hole for mounting on a table of a machine tool, and above the base is mounted on the machine tool. A main body of a grinder having a frame body that stands up at an angle substantially the same as the internal taper of the spindle, a guide frame body that is fixed after being loosely fitted in the frame body portion, and the guide frame body. And a vertically movable grindstone base, a nut fixed between the grindstone base and the guide frame and fixed to the grindstone base, and screwed through the nut to penetrate the grinder body. A rotatably supported screw rod, a vertical movement motor that is connected to the screw rod to move the grinding wheel head in the axial direction, and a cylinder fixed vertically to the surface of the wheel head. And a rotatable main shaft which penetrates the cylinder and is pivotally supported at both ends thereof, A grinding wheel attached to the tip of a shaft, a rotating motor mounted on the grinding wheel base for rotating the spindle, and a grinder main body for adjusting the spindle to an internal taper angle of the spindle. It is composed of the angle adjustment screw provided.

[0006]

[Action]

 Next, the operation of the present invention will be described. Prepare the product of the present invention in advance according to the internal taper angle of the spindle (18) to be reground. At this time, the grinding wheel (11) is attached to the tip of the main shaft (10). First, the product of the present invention is placed on the table (17) of the machine tool, and is temporarily fixed to the table (17) by using a fastening bolt (not shown) in the mounting hole (1a). Next, the end face of the base (1) is brought into contact with the abutment block (17a) set on the table (17) to fix and fix the X axis (see FIG. 5). Remove the grinding wheel (11) and attach the dial gauge (20) to the tip. Then, in order to align the center of the spindle (18) with the center of the main shaft (10), attach a milling chuck (18a) to which a round bar (18b) that serves as a reference is added in advance to the spindle (18). The contact of the dial gauge (20) is brought into contact with the round bar (18b) (see FIG. 6). While rotating the round bar (18b), the centers of the spindle (10) and the spindle (18) are aligned by moving the table (17). Then, the milling chuck (18a) is removed from the spindle (18), and the grinding wheel (11) is attached to the tip of the main shaft (10). Next, the stroke of the grinding wheel (11) is adjusted. To explain this method, first bring the grinding wheel (11) to the inner surface of the spindle (18), stop the stroke of the grinding wheel (11) at the upper limit position, and lower the spindle (18). The vertical direction is clamped at the position where the grinding wheel (11) comes to the deepest part of the inner surface of the taper. Next, the grinding wheel (11) is returned and the position slightly out of the spindle (18) is set as the lower limit position (see Fig. 7). Then, the table (17) is slightly moved to allow the grinding wheel (11) to make a space of about one sheet of paper with respect to the inner surface of the taper, and then the vertical movement motor (8) and rotation motor. Drive the motor (12). After that, rough cutting is first performed. For roughing work, the grinding wheel (11) is moved up and down 3 to 4 times, and the feed amount is ground by moving the table (17) by about 2 μm. As a guideline for the feed amount of about 2 μm, it is sufficient to make sure that sparks appear almost uniformly on all surfaces. Next, finishing work is performed. As a finishing work, the grinding wheel (11) is moved up and down 6 to 7 times, and the feed amount is such that the table (17) is moved to grind about 1 μm at a time. This completes the regrinding of the spindle (18). In addition, as a result of measuring the vibration of the taper inner surface of the regrinded spindle (18), it was a good result within 3 μm.

Next, when the spindles (18) having different internal taper angles are used, the above work is carried out by replacing the spindles (18) with the taper angles. A method of matching the internal taper angle of the spindle (18) with the grinding wheel (11) will be described. A predetermined taper master block (19) is prepared in advance. First, remove the grinding wheel (11) from the tip of the spindle (10) and install the dial gauge (20). Then make sure the angle adjustment screw (15) is tightened and loosen the clamp bolt (16). Then, the screw rod (6) is rotated to determine the position of the base (1) so that the spindle (10) can move parallel to the master block (19) (see FIG. 8). Then, the main shaft (10) is moved on the master block (19), and the angle adjusting screw (15) is rotated until the needle of the dial gauge (20) does not shake (see FIG. 9). After the adjustment, the clamp bolt (16) is tightened to complete the angle matching work of the grinding wheel (11).

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. (1) is a base having a mounting hole (1a) for mounting on a table (17) of a machine tool. (2) is a main body of a grinder having a frame (2b) above the base (1) which stands up at an angle substantially the same as the taper of the spindle (18) mounted on the machine tool. In the main body (2) of the grinder, a plate-shaped mounting portion (2a) having an inclined surface and a frame body portion (2b) standing on the mounting portion are integrally formed. The lower part of the grinder main body (2) is fixed to the base (1) with bolts (not shown). Further, a recess (2c) is provided below the frame body (2b). The base (1) and the grinder main body (2) may be integrally formed by casting in order to have sufficient rigidity against vibration and chatter. (3) is a substantially rectangular guide frame body that is loosely fitted in the frame body portion (2b). The guide frame body (3) is provided with two guide protrusions (3a). There is. The gap between the guide frame (3) and the frame part (2b) should be such that the guide frame (3) is inclined and can correspond to each taper angle of the spindle (18). Good. Reference numeral (4) is a substantially rectangular grindstone base that is fitted to the guide frame (3) and is vertically movable. (5) is a nut fixed between the grindstone base (4) and the guide frame (3) and fixed to the grindstone base (4). (6) is a rotatable screw rod that is screwed into the nut (5) and penetrates, and is pivotally supported by the grinder main body (2). As the screw rod (6), vertical movement is easy and accurate. Ball screws are used for good movement. (7) and (7 ') are bevel gears, and (8) is connected to the screw rod (6) through the bevel gears (7) and (7') to move the grinding wheel head (4) in the axial direction. This is a motor for vertical movement that is possible. (9) is a cylinder fixed vertically to the surface of the wheel head (4), and (10) is a rotatable main shaft which penetrates the cylinder (9) and is axially supported at both ends through bearings and the like. Is. (11) is a grinding wheel attached to the tip of the main shaft (10). Reference numeral (12) is a rotation motor for mounting the wheel head (4) and rotating the spindle (10), and (13) is a belt. Reference numeral (14) is a positioning pin which is fitted into the guide frame body (3) substantially at the center and fixed to the grinder main body (2). (15) is an angle adjusting screw screwed on both sides of the frame body (2b), and the angle adjusting screw (15) adjusts the spindle (10) to the taper angle of the spindle (18). It is a thing. Reference numeral (16) is four crank bolts. The crank bolt (16) penetrates through the frame body portion (2b) and is screwed into the back surface of the guide frame body (3) to be guided by the guide frame body (3). To fix. The stop control of the upper limit position and the lower limit position of the grinding wheel (11) may be performed by a publicly known technique by providing a limit switch (not shown) or controlling the vertical movement motor (8). The above description is omitted.

[0009]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects.

When the spindle (18) of the machine tool is to be repaired, the product of the present invention is smaller than the conventional one and is easy to carry so that it can be used in the field. Therefore, this product is the process of removing the spindle (18) from the conventional machine tool (about 4 to 6 hours for the quill type and about 8 to 10 hours for the ram type) and the spindle (18) to the machine tool. The process of assembling (about twice as long as the process of removing) and the trouble of bringing in and receiving the repair maker are unnecessary, and the time during which the machine tool is stopped during that time is also unnecessary. ) Re-grinding can be done at extremely low cost, the waiting time loss during machining can be drastically reduced, and the machining schedule can be managed with almost no deviation.

Compared with the conventional grinder for the inner surface of the spindle, the number of parts is much smaller, the manufacturing cost is lower, and the failures are drastically reduced.

[0012] Since the operation is simple, the conventional skill required for repair is not required, anyone can easily re-grind the spindle (18), and the conventional re-grinding man-hour takes 2-3 days. It becomes possible to re-grind in one day.

The angle adjusting screw (15) can be easily used to manufacture the device of the present invention and adjust and finely adjust it to the internal taper angle of the predetermined spindle (18).

[Brief description of drawings]

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

FIG. 2 is a partially exploded perspective view of the present invention.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is an enlarged sectional view taken along line BB of FIG.

FIG. 5 is an explanatory diagram showing an installed state.

FIG. 6 is an explanatory diagram showing a centered state.

FIG. 7 is an explanatory diagram showing a grinding state of an internal taper of a spindle.

FIG. 8 is an explanatory diagram showing an angle adjustment state.

FIG. 9 is an explanatory diagram showing a state where fine adjustment of an angle is performed.

[Explanation of symbols]

 1 Base 1a Mounting hole 2 Grinding machine main body 2b Frame part 3 Guide frame 4 Grinding stone base 5 Nut 6 Screw rod 8 Vertical movement motor 9 Cylinder 10 Spindle 11 Grinding wheel 12 Rotating motor 15 Angle adjustment screw 17 tables 18 spindles

Claims (1)

[Scope of utility model registration request] 1. A base (1) having a mounting hole (1a) for mounting on a table (17) of a machine tool, and the base (1).
Above the frame, the frame body (2) that stands up at an angle substantially the same as the internal taper of the spindle (18) mounted on the machine tool
b) having a grinder main body, a guide frame body (3) fixed after being loosely fitted in the frame body part (2b), and vertically moved by fitting the guide frame body (3) A free wheel head (4), a nut (5) fixed to the wheel head (4) between the wheel head (4) and the guide frame (3), and the nut (5)
And a rotatable screw rod (6) axially supported by the main body (2) of the grinder and connected to the screw rod (6) to axially move the grinding wheel head (4). And a vertically movable motor (8), a cylinder (9) fixed vertically to the surface of the grindstone (4), and a shaft support at both ends of the cylinder (9). And the rotatable main shaft (10),
A grinding wheel (11) attached to the tip of the spindle (10), a rotation motor (12) mounted on the grinding wheel base (4) for rotating the spindle (10), and the spindle (10). ) To the spindle (1
A spindle inner surface grinding machine of a machine tool, characterized in that the grinding machine main body (2) comprises an angle adjusting screw (15) for adjusting to the taper angle of 8).