JPH0683939B2 - Abrasive Reaming Machine Table - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a table for an abrasive grain reaming machine, and in particular, at the time of abrasive grain reamer processing, the table is movably provided in a plane orthogonal to a reamer axis, The present invention relates to a table for an abrasive reamer processing machine, which can perform processing with high accuracy and efficiency by locking the reamer after centering it in the prepared hole of the work.

[Prior Art] An abrasive reamer is known as a tool for highly efficient and highly accurate drilling of automobile parts, gears, hydraulic parts, pneumatic parts, aircraft parts, ceramics and the like. Generally used for finishing of through holes, but particularly effective in holes with switching valves, holes with keyways, spline holes, and the like. As for the shape, the tip part is a guide, and it is easy to enter into the prepared hole of the work. Next to the guide, there are taper, straight and back taper electrodeposited abrasive grain portions, and lead grooves and linear grooves are formed.

[Problems to be Solved by the Invention] However, the abrasive grain reamer tool of this type has a long tool length and requires a margin for the tool to be released at the tip of the through-hole for the work, and therefore the table structure of a normal machine is required. Then, it is necessary to provide a fixture on the table to lift and mount the work by the amount of the margin.

Therefore, for example, in a vertical machining center,
The maximum distance from the top surface of the table to the tip of the spindle is often about 200 mm, and a machine with a large Z (spindle axis direction) stroke is required, so it is uneconomical because it is a dedicated machine using a general-purpose machine. Further, the height from the floor surface to the upper surface of the mounting tool is increased, which causes a problem of impairing workability.

Further, as the holder of the abrasive grain reamer tool, a floating holder is used because the tool on the spindle side is made to follow the workpiece pilot hole even if the center of the workpiece pilot hole and the center of the spindle are misaligned. Since this floating holder has low rigidity, the feed rate must be reduced in order to maintain the machining accuracy, and the machining efficiency cannot be increased.

Therefore, an object of the present invention is to provide a table for an abrasive grain reamer machine that can perform highly accurate hole drilling with an abrasive grain reamer with high efficiency.

[Means for Solving the Problems] The following means for solving the problems are adopted.

In a processing machine configured by a spindle head movable in the spindle axis direction, a spindle rotatably provided in the spindle head, and a base facing the spindle and having a large-diameter hole portion formed in the spindle axis direction, A work mounting plate having a through hole formed in the center and an upper surface serving as a mounting surface, a hollow sleeve having one end fixed to the peripheral surface of the through hole, and the work mounting plate within a predetermined area of a plane orthogonal to the spindle axis. A table for an abrasive grain reamer machine, comprising: a bearing member that is movably supported by means of; and pressing means that is housed in the large diameter hole portion and that presses the hollow sleeve against the bearing member in the axial direction. .

The pressing means includes a cylinder fixed to the lower surface of the base plate, a hollow piston having a through hole through which the sleeve is inserted in the center, and the hollow piston and the hollow sleeve that are constrained in the circumferential direction and are orthogonal to the main axis. It is still more effective if it is constituted by an engagement member fixed to a hollow sleeve that is movably engaged in the direction.

It is still more effective that the bearing member is provided with a plurality of air ejection nozzles on its upper surface and an air layer is formed between the bearing member and the lower surface of the work mounting plate by supplying air from the outside.

[Operation] According to the abrasive grain reamer processing table according to the present invention,
At the time of the abrasive grain reamer processing, the workpiece attaching plate on which the workpiece is attached is slightly floated by the supply of air so that the workpiece attaching plate can be moved in the horizontal plane, and the downward movement of the spindle head engages the abrasive grain reamer with the prepared hole. By this descending operation, the center of the prepared hole can be aligned with the center of the reamer, and the work mounting plate can be moved. By fixing and holding the work mounting plate, highly accurate abrasive grain reamer machining can be performed with high efficiency.

[Examples] Examples of the abrasive grain reamer processing table according to the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a cross-sectional view of an essential part of a table for an abrasive grain reamer processing machine of the present invention. The bed 1 constitutes the main body. The bed 1 has a large-diameter hole 2 formed in the axial direction of the spindle,
A base plate 3 is fixed on the bed 1.
Further, a bearing member 5 provided with a plurality of air jet nozzles 4 is fixed on the base plate 3,
Holes 6 and 7 are formed in the center of the base plate 3 and the bearing member 5, respectively.

A work mounting plate 8 is mounted on the upper surface of the bearing member 5 so as to be movable in a horizontal plane, and a central sleeve 10 is vertically fixed in a central hole portion 9 so that the work mounting plate 8 can be mounted in the hole 7 The movement area is limited within the range. On the other hand, the bottom surface of the base plate 3 has a cylinder.
11 is fixed, and a hollow piston 12 is fitted in the cylinder 11 so as to be vertically movable.

Further, a thrust plate 13 is inserted into the lower end of the hollow sleeve 10 via a key 14, and a space between the thrust plate 13 and the hollow piston 12 is penetrated in the center to the same extent as the through hole 16 of the hollow piston 12. A coupling plate 15 having a hole 17 is sandwiched. This coupling plate 15
As shown in FIG. 2, notches 18 and 19 are formed alternately on the outer circumference and the inner circumference in the radial direction, respectively.

A pair of pins 20 screwed to the lower end of the cylinder 11 are engaged with the notch groove 18 on the outer circumference, and a pin 21 screwed to the upper surface of the thrust plate 13 is engaged with the notch groove 19 on the inner circumference.
In this way, the fixed side cylinder 11 and thrust plate 13
And the hollow sleeve 10 through the coupling plate 15
Is constrained in the circumferential direction and is movably engaged in a specific area of the horizontal plane to form a kind of Oldham coupling.

In the air jet nozzle 4 of the bearing member 5 described above,
Small holes 22 communicating with this are formed respectively, and these small holes 22 communicate with the air inflow port (not shown) of the base plate 3. Further, an upper oil chamber 25 and a lower oil chamber 26 are formed by the hollow piston 12 in the cylinder 11.
These oil chambers 25 and 26 communicate with each other from an oil inflow / outflow port (not shown) provided on the base plate 3 through an oil passage.

Next, the circuit diagram of FIG. 3 will be described. That is, the air pressure source 30 is connected to the air inflow port by the conduit 32 via the ON / OFF switching valve 31. A hydraulic power source 34 is connected to each of the oil chambers 25 and 26 via a two-position direction switching valve 33.

Operation Next, the operation of the table will be described in relation to the abrasive grain reamer of the present invention. That is, in the initial state, the spindle is stopped, the spindle head is at the rising end, the work mounting plate is fixed (the oil pressure is supplied within the hydraulic pressure 25), and the ON / OFF switching valve is in the OFF state. In this state, the work mounting plate 8
Presses the hollow piston 12 by the action of pressure oil, and presses the work mounting plate 8 onto the bearing member 5 via the thrust plate 13 and the hollow plate 10.

In this case, since the plate 8 is strongly pressed against the upper surface of the bearing member 5, it is not moved by normal force. In this state, the worker mounts the workpiece having the prepared hole on the workpiece mounting plate 8 so that the prepared hole is located at the center of the plate 8. Next, the two-position directional control valve 33 is switched to supply pressure oil to the oil chamber 26, and the fixation of the plate 8 is released. At the same time, the ON / OFF switching valve 31 is switched to ON, and air is jetted from the air jet nozzle to form a static pressure air bearing between the bearing member 5 and the plate 8.

As a result, the plate 8 is brought into a state in which it can move on the horizontal plane with a slight force. In this state, the spindle head is lowered, the tip taper portion of the abrasive grain reamer T attached to the spindle end is inserted into the workpiece W pilot hole, and when the pilot hole center is deviated from the spindle center, In the state shown in FIG. 5 (a), the abrasive grain reamer tip taper portion abuts the prepared hole corner portion. When the reamer T is further lowered, the corner of the prepared hole is guided by the abrasive taper reamer tip taper part to move to the center together with the plate fixed by the jig J, and the center of the prepared hole coincides with the center of the reamer.

Therefore, the ON / OFF switching valve 31 is switched, and at the same time, the two-position switching valve 33 is switched to supply oil to the oil chamber 25 to fix the work mounting plate (Fig. 5 (b)). The switching valves 31, 33
Can be selectively used with either a solenoid valve or an air pilot valve.

Further, the above-mentioned respective operations can be easily understood by referring to the operation diagram of FIG. As another method, it is possible to rotate the main shaft at a low speed while the reamer tool is approached, and to perform the automatic operation mode after the work is attached (broken line in FIG. 4).

[Other Embodiments] In the above-described embodiments, in order to pull the hollow sleeve 10 in the axial direction, hydraulic pressure is used to fix the workpiece mounting plate 8 to the bearing member 5. This fixing is not hydraulic, but may be another mechanism such as a screw clamp, a cam, a link mechanism or the like which is usually used in a clamp mechanism.

[Effects of the Invention] As is apparent from the above-described embodiments, according to the present invention,
By supporting the workpiece mounting plate that composes the table with aerostatic bearings, it is possible to center the workpiece pilot hole by the engagement of the tip of the abrasive reamer moving downward in the direction of the spindle axis, and the conventional flow Machining with rigidity is possible without using a teeing reamer holder, and the performance of the abrasive reamer can be fully exhibited, and highly accurate hole drilling can be achieved with high efficiency.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part of a table showing an embodiment of a table for an abrasive grain reamer processing machine according to the present invention, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, FIG. Figure 4 is a motion diagram,
FIG. 5 shows an explanatory view of centering operation of the prepared hole by the reamer, FIG. 5 (a) is an explanatory view showing a state where the reamer and the prepared hole are engaged, and FIG. 5 (b) shows a reamer and prepared hole. It is an explanatory view showing a state where centering is completed. 1 ... Bed, 2 ... Large-diameter hole portion, 3 ... Base plate, 4 ... Jet nozzle, 5 ... Bearing member, 6, 7
…… Hole, 8 …… Workpiece mounting plate, 9 …… Center hole, 10 …… Hollow sleeve, 11 …… Cylinder, 12 …… Hollow piston, 13 …… Thrust plate, 14 …… Key, 15…
… Coupling plates, 16, 17… Through holes, 18, 19…
… Notch groove, 20, 21 …… Pin, 22 …… Small hole, 25 …… Upper oil chamber, 26 …… Lower oil chamber, 30 …… Air pressure source, 31 …… Switching valve, 32
...... Pipe, 33 …… 2-position directional valve, 34 …… Hydraulic source, J
…… Mounting jig, T …… Reamer, W …… Workpiece

Front page continuation (72) Inventor Hiroshi Nakao 2-80, Hokitakita-cho, Sakai City, Osaka (56) References JP-A-63-229221 (JP, A) JP-A-62-48411 (JP, A) Actual development Sho 63-120741 (JP, U) Japanese public Sho 62-46294 (JP, B2)

Claims (3)

[Claims] 1. A spindle head movable in a spindle axis direction,
In a processing machine composed of a main spindle rotatably provided on the main spindle head and a base facing the main spindle and having a large diameter hole formed in the main spindle axis direction, a through hole is formed in the center and an upper surface is attached. A work mounting plate serving as a surface, a hollow sleeve having one end fixed to the peripheral surface of the through hole, a bearing member that movably supports the work mounting plate within a predetermined region of a plane orthogonal to the spindle axis, A table for an abrasive grain reaming machine, comprising: a pressing means that is housed in a large-diameter hole and presses the hollow sleeve against the bearing member in the axial direction. 2. The pressing means includes a cylinder fixed to a lower surface of a base plate, a hollow piston having a through hole for inserting the sleeve in the center thereof, and the hollow piston and the hollow sleeve are restrained in the circumferential direction. An engaging member fixed to a hollow sleeve, which is movably engaged in a direction orthogonal to the main axis, is provided.
Table for the abrasive grain reamer processing machine according to the item. 3. The bearing member is configured such that a plurality of air ejection nozzles are provided on an upper surface thereof and an air layer is formed between the bearing member and a lower surface of the work mounting plate by supplying air from the outside. Table for the abrasive grain reamer processing machine according to item 1.