JPH02106237A - Table for abrasive grain reaming working machine - Google Patents

Abstract

PURPOSE:To enable the achievement of a highly precise hole work at a high efficiency without using a floating reaming holder by supporting a work mounting plate forming a table by an air static pressure bearing. CONSTITUTION:A work after prepared hole working is mounted on a plate 8, and a two-position directional control valve 33 is switched to supply a pressure oil, thereby releasing the fixing of the plate 8. At the same time, a directional control valve 31 is turned on to exhaust air, thereby forming a static pressure air bearing between a bearing member 5 and the plate 8. A main shaft head is lowered in this state, and the top end taper part of an abrasive reaming T on the main shaft end is inserted into a work W prepared hole. When the prepared hole center is shifted to the main shaft center, the top end reaming taper of the reaming is made in contact with the prepared hole angle part. When the reaming T is further lowered, the prepared hole angle part is guided by the top end taper part of the reaming T, whereby the work is moved to the center together with the fixed plate of a jig J, and the prepared hole center accords with the reaming center. Then, the oil is supplied to an oil chamber 25 by switching the directional control valves 31, 33 to fix the plate 8.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a table for an abrasive grain reaming machine, and in particular, during abrasive grain reaming, the table is provided movably in a plane orthogonal to the reamer axis, This invention relates to a table for an abrasive reaming machine that enables highly accurate and efficient machining by locking the reamer after centering it in the prepared hole of the workpiece.

[Prior Art] Abrasive reamers are known as tools for drilling holes in automobile parts, gears, hydraulic parts, pneumatic parts, aircraft parts, ceramics, etc. with high efficiency and high precision. It is generally used for finishing through holes, but is particularly effective in holes with switching valves, holes with keyways, spline holes, etc. The shape of the tip is a guide, making it easier to enter the pilot hole of the workpiece. Next to the guide, there are electrodeposited abrasive grain portions of the taper, stray 1-, and back taper, and there are lead vortices and straight grooves.

[Problems to be Solved by the Invention] However, this type of abrasive reamer tool has a long tool length and requires room for the tool to pass through the pilot hole of the workpiece, so the table structure of a normal machine cannot be achieved. Then, it is necessary to provide a tool to lift the workpiece up and attach it to the table to accommodate that extra space.

For this reason, for example, in a vertical machining center,
The maximum distance from the top of the table to the tip of the spindle is 200m.
In many cases, a machine with a large Z (spindle axis direction) stroke is required, which is uneconomical since a general-purpose machine is used instead of a special-purpose machine. In addition, mounting from the floor surface increases the height from the top of the tool, which poses a problem in that workability is impaired.

Furthermore, a floating holder is used for the abrasive reamer tool holder in order to allow the tool on the spindle side to follow the workpiece prepared hole even if the center of the workpiece prepared hole is misaligned with the center of the spindle. Since this floating holder has low rigidity, the feed rate must be reduced in order to maintain machining accuracy, which has the problem that machining efficiency cannot be increased.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a table for an abrasive reamer that can perform highly accurate hole machining using an abrasive reamer with high efficiency.

[Means for solving the above problems] The following measures will be taken to solve the above problem.

A processing machine comprising a spindle head movable in the spindle axis direction, a spindle rotatably provided on the spindle head, and a base facing the spindle and having a large diameter hole formed in the spindle axis direction, A workpiece mounting plate having a through hole formed in the center and a mounting surface on the upper surface, a hollow sleeve having one end fixed to the circumferential surface of the through hole, and a plane perpendicular to the main axis axis of the workpiece 1 are used for mounting the workpiece. an abrasive reaming machine comprising: a bearing member movably supported within a predetermined area; and a pressing means housed in the large diameter hole and pressing the hollow sleeve against the bearing member in an axial direction. This is a table for use.

The pressing means includes a cylinder fixed to the lower surface of the base plate, a hollow piston having a through hole in the center through which the sleeve is inserted, and the pressing means restrains the hollow piston and the hollow sleeve in a circumferential direction and is perpendicular to the main shaft axis. It is even more effective to configure it with an engaging member fixed to a hollow sleeve that engages movably in the direction.

It is more effective if the bearing member is provided with a plurality of air jet nozzles on its upper surface, and air is supplied from the outside to form an air layer between the bearing member and the lower surface of the plate.

[Function] According to the table for an abrasive reamer processing machine according to the present invention,
During abrasive reaming, the workpiece is mounted by slightly floating the play 1- by supplying air so that it can move in a horizontal plane, and the descending movement of the spindle head engages the abrasive reamer with the pilot hole.

With this downward movement, the center of the prepared hole coincides with the center of the reamer, and the plate can be moved for mounting the workpiece. By holding this in place, high-precision abrasive reaming can be performed with high efficiency.

[Example] Hereinafter, an example of the table for an abrasive reamer processing machine according to the present invention will be described in detail with reference to the drawings. FIG. 1 shows a sectional view of a main part of a table for an abrasive reaming machine according to the present invention. The bed 1 constitutes the main body. The bed 1 has a large diameter hole 2 formed in the direction of the main shaft axis, and a base plate 3 is fixed onto the bed 1. Furthermore, a bearing member 5 provided with a plurality of air jet nozzles 4 is fixed on the base plate 3, and holes 6 and 7 are bored in the centers of the base plate 3 and the bearing member 5, respectively.

Further, a workpiece mounting plate 8 is placed on the upper surface of the bearing member 5 so as to be movable in a horizontal plane, and a central sleeve 1o is vertically fixed in the central hole 9. The movement area is limited within the range of the hole 7. On the other hand, a cylinder 11 is fixed to the lower surface of the base plate 3, and a hollow piston 12 is fitted into the cylinder 11 so as to be movable up and down.

Further, a thrust I/plate 13 is inserted into the lower end of the hollow sleeve 10 via a key 14, and between the thrust plate 13 and the hollow piston 12, there is a hole in the center of the same size as the through hole 16 of the hollow piston 12. A coupling plate 1, 15 having a through hole 17 formed therein is held between the coupling plates 1 and 15. As shown in FIG. 2, this coupling plate 15 has notched grooves 18 and 19 arranged alternately in the radial direction on its outer circumference and inner circumference, respectively.
is formed.

A pair of pins 20 screwed onto the lower end of the cylinder 11 are engaged with the cutout groove 18 on the outer circumference, and a pin 21 screwed onto the upper surface of the thrust plate 13 is engaged with the cutout groove 19 on the inner circumference. In this way, the fixed cylinder 11 and thrust plate 13 restrain the hollow sleeve 10 in the circumferential direction via the coupling plays 1 to 15, and
They are movably engaged within a specific area on the horizontal plane, forming a type of Oldham coupling.

The air jet nozzle 4 of the bearing member 5 described above includes
Small holes 22 communicating with these holes are formed, respectively, and these small holes 22 communicate with an air inlet boat (not shown) of the base plate 3. Further, an upper oil chamber 25 and a lower oil chamber 26 are formed in the cylinder 11 by the hollow piston 12. These oil chambers 25 and 26 communicate with an oil inlet/outlet boat (not shown) projecting from the base plate 3 via oil passages.

Next, the circuit diagram shown in FIG. 3 will be explained. That is, the air pressure source 30 is connected to the air inflow boat via an ON/OFF switching valve 31.
They are connected by a conduit 32 via. Further, a hydraulic power source 34 is connected to each of the oil chambers 25 and 26 via a two-position directional switching valve 33.

JL Next, the operation of the table will be explained in relation to the abrasive reamer of the present invention. That is, in the initial state, the spindle is stopped, the spindle head is at the rising end, the plate is fixed for mounting the workpiece (oil is supplied in the hydraulic pressure 25), and the ON/OFF switching valve is in the OFF position.
The state becomes FF. In this state, when mounting the workpiece, the plate 8 lowers the hollow piston 12 by the action of pressure oil.
When mounting the workpiece through the thrust plate 13 and the hollow plate 10, the plate 8 is pressed onto the bearing member 5.

In this case, since the plate 8 is strongly pressed against the upper surface of the bearing member 5, it will not be moved by normal force. In this state, the operator attaches the workpiece with the pilot hole cut onto the plate 8 so that the pilot hole is centered on the plate 8.

Next, the two-position directional switching 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 turned ON, and air is jetted from the air jet nozzle to form a hydrostatic air bearing between the bearing member 5 and the plate 8.

This allows the plate 8 to move on a horizontal plane with a slight force. In this state, lower the spindle head and insert the tapered tip of the abrasive reamer T attached to the end of the spindle into the prepared hole of the workpiece W. If the center of this prepared hole is shifted from the center of the spindle, The state shown in FIG. 5(a) is reached,
The tapered tip of the abrasive reamer contacts the corner of the prepared hole. When the reamer T is further lowered, the corner of the prepared hole is guided by the tapered part of the abrasive reamer tip and moves to the center together with the plate fixed by the jig and J, so that 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 2-position directional switching valve 33 is switched to supply oil to the oil chamber 25, and the plate is fixed for mounting the workpiece (Figure 5 (b)). 31.33 can be selectively used with either a solenoid valve or an air pilot valve.

Further, each of the above-mentioned operations can be easily understood by referring to the operation diagram shown in FIG. Alternatively, the main shaft may be rotated at a low speed while the reamer tool is being approached, and the workpiece mounting may be performed in automatic operation mode after completion (broken line in Figure 4).

[Other Embodiments] In the embodiments described above, the bearing member 5 is fixed to the workpiece mounting plate 8 using hydraulic pressure to pull the hollow sleeve 10 in the axial direction. This fixing is not done by hydraulic pressure, but may be by other mechanisms normally used in clamp mechanisms, such as screw clamps, cams, link mechanisms, etc.

[Effect of the invention 1 As is clear from the above embodiments, according to the present invention,
When mounting the workpiece that makes up the table, by supporting the plays 1 to 1 with air static pressure bearings, the workpiece pilot hole can be centered by engaging the abrasive reamer tip by moving it downward in the direction of the spindle axis. Thus, rigid machining is possible without using a floating reamer holder, the performance of the abrasive reamer can be fully demonstrated, and high precision hole machining can be achieved with high efficiency.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of a table showing an embodiment of the table for an abrasive reamer processing machine according to the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a circuit diagram. Figure 4 is an operation diagram,
Figure 5 shows an explanatory view of the centering operation of the pilot hole by the reamer, Figure 5 (a) is an explanatory diagram showing the state in which the reamer and the pilot hole are engaged, and Figure 5 (b) shows the reamer and the pilot hole. FIG. 3 is an explanatory diagram showing a state in which centering is completed.

Claims (1)

[Scope of Claims] 1. A spindle head movable in the spindle axis direction, a spindle rotatably provided on the spindle head, and a base that faces the spindle and has a large diameter hole formed in the spindle axis direction. A processing machine that includes a workpiece mounting plate that has a through hole in the center and whose upper surface is the mounting surface, a hollow sleeve that has one end fixed to the circumferential surface of the through hole, and a workpiece mounting plate that connects the workpiece mounting plate to the spindle axis. a bearing member supported movably within a predetermined area on a plane orthogonal to the abrasive wheel, and a pressing means housed in the large diameter hole and pressing the hollow sleeve against the bearing member in the axial direction. Table for grain reaming machine. 2. The pressing means includes a cylinder fixed to the lower surface of the base plate, a hollow piston having a through hole in the center through which the sleeve is inserted, and restraining the hollow piston and the hollow sleeve in the circumferential direction and aligning with the main shaft axis. 2. The table for an abrasive reaming machine according to claim 1, further comprising an engaging member fixed to a hollow sleeve that is movably engaged in orthogonal directions. 3. The bearing member is configured to have a plurality of air jet nozzles on its upper surface and to form an air layer between it and the lower surface of the workpiece mounting plate by supplying air from outside. Table for abrasive reaming machine.