JPH0429928Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to chip disposal and damage detection of a drill having a helical groove along the cutting edge around the tool axis. During chip disposal, the rotary guide rotates relative to the drill axis and moves in the axial direction using the drill's torsional groove as a guide, and the scraper piece attached to the rotary guide moves into the torsional groove. It has a structure that removes chips from the drill by sliding and scraping them out. Also, in detecting drill breakage, a difference in air pressure is discharged from a sensor nozzle that communicates with the land of the drill from the radial direction inside the rotary guide. This invention relates to a device that detects pressure when a drill breaks and stops the cycle of the main machine.

In order for the detection switch to operate reliably due to the differential pressure of the air, the air pressure must be kept constant at all times, and air leakage, which causes pressure drop, must be minimized to the extent possible so that the detection switch operates within the pressure setting range of the detection switch. There is a need. In this invention, the two functions are compactly housed in the same device and are structured so that they work organically with each other, so that in the event of a drill breakage, the air pressure will not be balanced and chip disposal will not be impossible. The object of the present invention is to provide a drill damage detection structure that eliminates air pressure leakage as much as possible and prevents frequent malfunctions of cycle stop of the main engine.

1 is the main body of the chip processing device of the present invention, 2 is a drill having a twisted groove 2a in the axial direction along the cutting edge on the outer periphery, and 3 is a drill that firmly holds the drill 2 and can be installed and fixed at any position in the longitudinal direction. The main body 1 is attached and fixed to the holder main body 4 using a holder shank. A feeding means 5 is supported by a guide lock 6 that is slidable on a guide portion 1a provided in the main body 1, and is capable of relative feeding movement along the axial direction of the drill 2;
Reference numeral 7 denotes a rotary rotary supported by the feeding means 5 with a rotary sleeve 8 and a bearing 9 interposed therebetween so that it can rotate around the shaft of the drill 2 and relatively move in the axial direction. A through hole 7a, through which the drill 2 passes, is provided at the center of the axis of the rotary 7, surrounding the axis of the drill 2, and having a hole diameter slightly larger than the diameter of the drill 2. Reference numeral 10 denotes a scraping piece having a protrusion 10a that engages with the helical groove 2a of the drill 2. The scraping piece 10 is prepared according to the diameter of the drill and is fixed to one end surface of the rotary 7 via a fixing means 11.
By relatively moving in the axial direction along the helical groove 2a, the parts a dispel the chips wrapped around the shaft of the drill 2 and also push the chips caught in the helical groove 2a outward. It is something to scrape out. Furthermore, when the scraping piece 10 advances toward the cutting edge of the drill 2, it also has the effect of cutting chips by the cutting blade of the drill 2 when scraps are scraped out of the helical groove 2a of the drill 2. Reference numeral 12 designates a pair of guide pins that are screwed into a first horizontal hole 7b that extends from the radial direction of the drill 2 toward the axial center of the rotary 7 and communicates with the through hole 7a. This serves to regulate the position of the twisted groove 2a of the protrusion 10a of the scraping piece 10 and to control the rotational movement of the rotary 7. The tip of the guide pin 12 is in contact with the twisted groove 2a, and by sliding in the axial direction along the twisted groove 2a, the rotary 7 can rotate and move in the axial direction relative to the axis of the drill 2. be.
Reference numeral 13 designates a pair of plungers 13 which are biased by a compression spring 14 and are disposed in a second horizontal hole 7c that extends from the radial direction of the drill 2 toward the axial center of the rotary 7 and communicates with the through hole 7a. The land is in contact with the outer periphery of the land. The plunger 1
The rear part of 3 is the ring spring 1 attached to the rotary 7.
It is regulated so that it does not jump out through 5. 16 is a second horizontal hole 7c from one end of the rotary 7
A sensor nozzle that crosses over from the vertical direction,
This sensor detects the breakage of the drill 2 by the back pressure drop of the preset air pressure fluid pressure injected from the sensor nozzle 16 when the drill 2 is broken. 17 is an annular flow path for supplying air pressure for sensor operation provided on the outer periphery of the rotary 7, and a second horizontal hole 7 with which the sensor nozzle 16 communicates.
It communicates with the upper part of c. 18 is a fluid cylinder which is a driving means for moving the feeding means 5 in the axial direction of the drill 2; the fluid cylinder 18 is fixed on the main body 1;
A feeding means 5 is connected to the piston rod 19 of the piston rod 19 . Reference numeral 20 denotes an air intake port through which air is supplied from the outside via the compressor and communicated with the annular flow path 17 on the rotary 7. A sensor confirmation fluid circuit is connected to the compressor, and a pressure switch for detecting pressure drop is interposed as a relay. ing.

Next, the operation of chip disposal by a drill equipped with the device of the present invention on a lathe will be explained first. The drill is brought to a predetermined machining position by the relative feed motion of the tool stand, moves forward toward the rotating workpiece gripped by the chuck of the main spindle, and begins drilling holes. Chips are scattered in all directions around the drill, permanent chips wrap around the land of the drill as well as the twist groove, and
Assume a situation where chips enter the helical groove and become trapped, preventing them from flowing out.

After drilling the hole with the drill, the tool stand retreats and the drill is pulled out from the workpiece. At the end of the pull-out operation of the drill or when the tool stand returns to its original position, the compressor is activated and air pressure is applied to the forward chamber of the fluid cylinder 18. is supplied, and the feed means 5 advances along the axis of the drill. At this time, the guide pin 12 held by the rotary 7 is attached to the helical groove 2 of the drill.
a, the robot slides along the twisting groove 2a and moves forward.
As a result, not only the rotary 7 but also the scraping piece 10
rotates along the helical groove 2a of the drill and moves forward in the axial direction of the drill, and the chips that have entered the helical groove 2a as well as the land of the drill are removed by the scraping piece 10.
is removed from the drill by the scraping action of Further, in parallel with this operation, the chips scraped out from the twisted groove 2a by the scraping piece 10 are forced into pressure contact with the cutting edge of the drill, and are cut by being bent. When the scraping piece 10 reaches the tip of the drill, air pressure is injected into the backward movement chamber of the fluid cylinder 18 and the feeding means 5 moves backward. As a result, the scraping piece 10 is returned to its original position along the twisted groove.

Next, the operation of detecting damage to the drill will be explained.

In the above action, when the feeding means 5 moves forward, air pressure is also supplied to the sensor confirmation fluid circuit.
Air is supplied from the air intake port 20 of the main body 1 through the annular flow path 17 to the second horizontal hole 7c, and the plunger 13 is advanced by air pressure, and its tip is pressed against the land portion of the drill. In the process of the above-mentioned chip disposal work, not only when the drill is broken, but also when, for example, the cutting edge of the drill 2 is partially chipped, the plunger 13 is released from the drill, and It moves forward due to air pressure, and the sensor nozzle 16 and the second horizontal hole 7c are opened and released, and air pressure is ejected from the sensor nozzle 16. A pressure switch connected to the sensor confirmation flow path is activated by a drop in air pressure back pressure, detects this and issues an operation stop signal to the main engine of the machine to confirm damage to the drill.

As described above, in the present invention, the rotary 7 that can rotate around the drill includes a scraping piece 10 for removing chips from the drill, and an annular flow path 17 formed between the rotary 7 and the rotary sleeve 8. The present invention has a center nozzle 16 to which air pressure is supplied from the center nozzle 16 and a plurality of drill breakage detection mechanisms using plungers 13 that shut off or open the center nozzle 16 depending on the state of the drill, so that the following effects are achieved.

Since it is possible to detect the state of damage to the drill while removing chips from the drill, it is possible to prevent the occurrence of defective products and accidents due to damage to the drill.

Since a plurality of drill breakage detection mechanisms are provided, drill breakage detection accuracy is high, and even if the chip processing speed is increased, drill breakage can be reliably detected. Furthermore, the more the drill damage detection mechanisms are provided, the more the detection accuracy can be improved.

Since air pressure is supplied to each center nozzle 16 from the annular flow path 17 formed between the rotary 7 and the rotary sleeve 8, a complicated air pressure supply mechanism is unnecessary and the structure of the air pressure supply mechanism is simple. Therefore, keeping the rotary 7 lightweight,
It is possible to realize multiple drill damage detection mechanisms.

Since the broken state of the drill is detected based on the state of pressure contact between the tip of the plunger 13 and the outer periphery of the drill, even if the drill does not completely break or fall off, a partial defect in the drill may occur. It can also be detected with high detection accuracy.

Even if the tip of the plunger 13 is made smaller in order to detect even smaller damage to the drill, it has multiple drill damage detection mechanisms, so it can monitor multiple positions on the outer periphery of the drill. The monitoring area for the outer periphery of the drill does not become narrow.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view of the main parts of the present invention, and Figure 2 is the first
FIG. 3 is a sectional view taken along arrow line AA in the figure, and FIG. 3 is a side view taken along arrow line BB in FIG. 2... Drill, 5... Feeding means, 7... Rotary, 10... Scraping piece, 12... Guide pin, 1
3...Plunger, 16...Sensor nozzle, 1
8...Fluid cylinder.

Claims (1)

[Scope of utility model registration request] Guide pin 1 that fits into the helical groove 2a of the drill
2, the rotary 7 is movable relative to the drill around the drill and can move forward and backward in its axial direction, and has a drill passage hole 7a formed therein; an annular scraping piece 10 having a protrusion 10a that engages with the rotary member 2a; A center nozzle 16 to which air pressure is supplied from a flow path 17 and a center nozzle 16 for each plunger storage hole are arranged so as to be biased toward the rotation center line of the rotary 7, and the tip is in pressure contact with the outer circumference of the drill. The plunger 13 cuts off the communication part of the center nozzle 16 and opens the communication part of the center nozzle 16 at a position moved toward the rotation center of the rotary 7 from that position, and the back pressure of the air pressure supplied to the sensor nozzle 11 is reduced. A chip processing device characterized by having a detection means for detecting.