JPS5920893Y2 - Boring holder - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a glue tract polling holder for preventing return marks of a cutting tool during polling, particularly boring finishing processing.

Conventionally, as a method for preventing this type of return mark, the working layer cutting tool was separated from the processed surface and then the cutting tool and holder or the workpiece was returned to the original position.

For this reason, there were inconveniences such as the cycle time required to move the spindle unit to which the tool was attached or the jig table to which the work was attached.

The present invention has been developed to improve this inconvenience.The holder has a slit at the tip, and during machining, the holder tip expands and the machining finished layer contracts to prevent the cutting tool from hitting the finished surface. There is no way to provide a poll holder.

To explain this with reference to the illustrated embodiment, 1 is a cutting tool, 2 is a holder, and 3 is a spindle.The holder 2 and the spindle 3 are hollow, and the holder 2 has a diametrical snot 4 on its end surface. In order to expand the slit 4, the hollow hole 5 of the holder 1 has its tip opening formed into a hole 5a, and an expansion rod 6 that is tapered and fitted is inserted into the hollow hole 5 of the holder 1. , the rod 6 expands the slit 4 by a retaining spring 10 consisting of a disc spring interposed between a spring receiver 8 provided in the hollow hole 7 of the spindle 3 and a spring receiver 9 provided at the base of the rod 6. The bullet is held open.

Reference numeral 11 denotes a pressing piece, and the pressing piece 11 is loosely fitted to the base of the spindle 3 in opposition to the end of the expansion rod 6, perpendicular to the shaft rod, and is slidably fitted into the spindle 3. supported by the collar 12 via a thrust bearing 13;
Further, the pressing piece 11 is connected to a drive arm 16 that is pressed by a bushing rod 15 provided on a jig stand 14 that holds the workpiece a, so as to press the expansion rod 6 against the spring 10 when the workpiece a is removed. The collar 12 is interlocked with a release device comprising a driven arm 18 connected to the collar 12 via a connecting rod 17, and a cam 19 attached to the arm 18 and abutting a cam floor provided on the collar 12.

In the figure, reference numeral 20 indicates a stopper 2 provided on the expansion rod 6 in order to make the amount of expansion of the holder 2 accurate, that is, the fixing position of the cutting tool 1.
1 is a return bar provided on the jig table 14; 22 is the return bar 2;
1 shows a locking pawl provided on the arm 16 for engagement.

Since the present invention is constructed as described above, when the jig table 14 is advanced while the holder 2 is rotating, the workpiece a on the jig table 14 has its opening processed and finished by the tool l-1. In this state, the bushing rod recess 5 on the jig table 14 operates the release device, and the pressing piece 11 interlocked with this presses the expansion rod 6 against the spring 10, so that the sleeve l-4 of the holder 2 Since the expanded state is released and the holder 2 is narrowed, the end of the outer periphery of the holder 2, by I-1, is separated from the machining surface. Therefore, when the deodorizing table 14 is returned to its original position in this state, the workpiece a is removed from the holder 2 without leaving a return mark. When the jig table 14 is returned, the release device is also returned to its original state by the return bar 21, so that the boulder 2 is again held in the extended I-I state by the expansion rod 6.

Note that the holder 2 can also have a ground surface formed by electrodepositing carbide abrasive grains on the outer periphery of its tip.

At this time, it is preferable to construct the holder so that the expanded state of the tip of the holder becomes a perfect circle.

In this way, according to the present invention, the rotary cutter holder 2 has a diametrical slint l-4 opening at the tip, and the slits 1 to 1.
4 is provided with an expansion rod 6 that is fitted into the holder 2 and resiliently held by a spring 10, and is linked to the relative movement of the rotary tool holder 2 and the workpiece a after machining. Since the expansion rod 6 is provided with a pressing piece 11 that presses against the spring 10 to release it, the cutter holder 2 reduces its outer diameter after machining the workpiece, so the spindle unit 1- or Even if the jig table on which the workpiece is mounted is returned to its original state, the cutting tool does not hit the surface of the machining surface, resulting in a significant reduction in machining cycle time.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal sectional side view, and FIG. 2 is a view taken along the line A--A in FIG. 1. 2...Blade tool holder, 4...Slib I
~, 6... Expansion rod, 10... Spring, 11... Pressing piece.

Claims (1)

[Scope of utility model registration request] A rotary cutter holder with a cutter formed on its outer periphery is provided with a diametrical slit opening at the tip, and an expansion rod that is inserted into the rotary cutter holder and resiliently held by a spring to expand the slit. The poling holder is further provided with a pressing piece that presses and releases the expansion rod against a spring in conjunction with the relative movement of the rotary cutting tool holder and the workpiece after processing.