JPH0112621B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an air supply device for air blowing to clean a main shaft taper hole into which a tool is fitted and a workpiece in a machining center or the like.

Prior Art Conventionally, when a tool is changed using an automatic tool changer (ATC) in a conventional machining center, an air blow device is attached to remove dust and oil film from the tool mounting surface of the spindle. In addition, an air blow device is included to remove chips from the hole when tapping a pilot hole on a workpiece, etc., but the air blow tool is stored in a magazine along with regular tools, and is used in ATC. Connected to the air source when attached to the main shaft. For this connection, a connecting pipe protrudes from the side of the tool, and a supply pipe section is provided on the main shaft side for piping from a pressure source. Furthermore, the pressure supply to the spindle side and the pressure supply to the tool side are carried out through separate piping, and each is provided with an electromagnetic switching valve. For this reason, interference in the storage section of the tool exchange arm magazine in the ATC becomes a problem and is inconvenient in terms of handling and design.

Purpose: Therefore, the present invention has been made in view of the above, and it uses a single air supply source for both air blows, eliminates the interference part of the air blow tool, eliminates the need for separate piping to the main shaft, and uses a single electromagnetic switching valve. The purpose is to provide a well-organized air supply device.

Solution: An air hole is provided in the center of the air blow tool and the tension rod, and a through hole is provided in the rod of the hydraulic piston that pushes the tension rod to unclamp the tool.A pressure source is provided at the end of the rod using a single electromagnetic switching valve. Attach an air cylinder to be connected to the cylinder, and insert an air hole through the rod of the piston fitted into the cylinder, and insert it into the hole of the rod of the hydraulic cylinder. When pressurized air is sent to the cylinder, the tip of the piston will be The piston has a check valve built into the piston that opens when the air pressure in the cylinder chamber reaches a predetermined value or more when the piston comes into contact with the tension rod and communicates with the air hole.

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. The main shaft 2 is rotatably supported on a main shaft sleeve 1 that can slide on the main shaft head of a machining center, and the main shaft 2 has a tapered hole 2 at the tip of which a tool is attached, as is well known.
(a) A through hole is drilled which has a clearance 2b necessary for the action of the collet, an inclined stepped portion 2c, a straight hole 2d, a housing hole 2f for the tension plate spring 6, and a stepped portion 2e. The tool installed in the taper hole 2a is stored in a magazine and replaced at ATC, but the tool has a thin nozzle 3a at the tip to blow away the chips from the tap pilot hole, or to clean the chips on the workpiece. The air blow tool 3 having a nozzle 3a also has a groove 3b for gripping the ATC, and has the same taper shank 3c and pull stud 3d as a normal tool, has an air hole 3e in the center, and is normally stored in a magazine. Straight hole 2d of main shaft 2
A known collet 4 is housed in the collet 4, and its base engages with the jaw 5a at the tip of the pull rod 5, and the hook at the end engages with the pull stud 3d of the tool. Several dozen disc springs 6 are housed in the hole 2f, and the spring receiver 7 and the stepped portion 2e are fixed to the threaded portion 5b at the tip of the tension rod 5.
The tension rod 5 is kept in a compressed state between
is biased in the direction of tightening the collet. An air hole 5c is bored through the center of the tension rod 5, and the end surface on the side of the spring receiver 7 is formed into a steeply tapered hole 5d. A cylinder tube 8 is fixed to the upper end of the main shaft sleeve 1, and a piston 9 is attached to the cylinder 8a.
is fitted. A hollow rod 10, which penetrates both walls of the cylinder tube 8, is fixed at the center of the piston 9. It acts as a push rod, and when pressurized oil is selectively sent to the oil passages 8b and 8c, the end face of the rod 10 is fixed. The tool is unclamped by pushing the pull rod 5, which is normally separated from the pull rod 5. An air cylinder 11 is fixed to the protruding end of the rod 10 with a screw, and a piston 12 is fitted into the cylinder 11a. Then, a rod pipe 13 having an air hole 13a penetrating one side of the piston is slidably inserted into the hole 10a of the rod 10.
Its tip has a taper 13b that fits into the tapered hole 5d at the tip of the tension rod 5, and when the piston 12 is pushed toward the tool, the rod tube 13 comes into pressure contact with the tension rod and both tapered surfaces are joined. The piston 12 is biased by a spring 14 inserted therein so that the rod tube 13 does not come into contact with the tension rod.
A check valve 16 is built into the valve body, which is always closed so as to open at a predetermined pressure or higher by a spring 15 stronger than the force of the check valve 15, and has an air groove 16a cut in the direction of the outer circumferential axis. When the check valve 16 opens, the air hole 13a of the rod 13 and the cylinder chamber communicate with each other. The flow path 11b is connected to a pressure air source via an electromagnetic switching valve 17.

Next, the effect will be explained. When a tool change is commanded, the designated tool is transferred from the magazine by the ATC, and when the arm of the ATC (not shown) moves to the tool change position holding the tool, pressure oil is sent to the oil path 8b of the hydraulic cylinder 8. The rod 10 of the piston 9 pushes the pull rod 5 against the force of the spring 6 to open the collet 4. Then, when the arm removes the tool from the main axis and aligns a new tool with the main axis, the electromagnetic switching valve 17 operates and pressurized air is sent to the air cylinder 11. When the piston 12 is pushed, the tip 13b of the rod tube 13 comes into pressure contact with the tapered hole 5d of the tension rod 5, and the air holes 13a and 5c communicate with each other. When the piston 12 is stopped and the air pressure in the cylinder chamber increases and reaches a predetermined value, the check valve 16 is opened and air is ejected from the gap in the collector 5 through the air holes 13a and 5c. When the arm inserts the tool into the spindle, the gap between the tapered surface 2a and the tool shank gradually narrows, and the tool is ejected from the gap with strong force, blowing away dust, and just before the tool is fitted, the pressure increases further to perform sufficient cleaning. It is something that can be done. Next, when a command to clean the tap pilot hole is issued, the air blow tool 3 is attached and the taper surface 2a is cleaned in the same way, but the pressure decreases due to the air escaping from the air hole 3e of the tool 3, making it similar to a normal tool. Although thorough cleaning is difficult, there is no particular problem since it is not affected by processing accuracy. When the air blow tool 3 is attached, the electromagnetic switching valve 17 acts to stop the supply of pressure air and the oil passage 8 of the hydraulic cylinder is activated.
b is switched to the discharge side and 8c is switched to the pressure side, and the rod 10 together with the piston 9 is separated from the tension rod 5. The tension rod 5 is pulled by the force of the spring 6 and the collection 4
When the operator pulls the pull stud 3d to fit the air blow tool, the position of the main shaft 2 is controlled and the nozzle 3a of the air blow tool 3 is inserted into the tap pilot hole. Thereupon, the electromagnetic switching valve 17 acts and pressurized air is sent to the air cylinder 11. The piston 12 is pushed, the tapered surface 13b of the rod tube 13 is pressed against the tapered hole 5d of the tension rod 5, the air pressure in the cylinder chamber rises, the check valve 16 opens at a predetermined value, and the air passes through the air holes 13a and 5c. It is sprayed from the nozzle 3a and can be cleaned by blowing off the chips.

Effects As detailed above, the present invention attaches an air cylinder to the piston rod of the cylinder for attaching and detaching tools, and the piston fitted into the air cylinder has a built-in check valve, and the piston rod of the air cylinder having an air hole is connected to the piston rod of the cylinder for attaching and detaching tools. It penetrates through the center of the rod so that it can come into contact with the tension rod, and communicates with the air hole of the tension rod.When the rod comes into contact with the tension rod, the pressure in the cylinder chamber increases, opening the check valve. The air blow tool can have a simple structure by simply drilling an air hole passing through the center, and since no connecting pipe is provided protruding, the inconvenience of interference with the exchange arm etc. can be eliminated. Furthermore, there is no need for any piping to connect to the air blow tool, making the system simpler, and since there is only one air supply path, the number of electromagnetic switching valves can be reduced to one, contributing to cost reduction.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the present invention. 3...Air blow tool, 5...Tension rod, 8...Cylinder for attaching/detaching tool, 9...Piston, 10...Rod,
11... Air cylinder, 12... Piston, 13... Rod pipe, 16... Check valve, 17... Solenoid switching valve.

Claims (1)

[Claims] 1. In an air supply device for main spindle taper hole cleaning and air blowing of machining centers, etc., for attaching and detaching tools, the first piston is fitted with a first rod having a through hole that connects to the air supply hole of the pull rod when unclamping the tool. a hydraulic cylinder mechanism, an air cylinder attached to the protruding end of the first rod, the air cylinder being fitted into the air cylinder and slidably inserted into the through hole of the first rod, and capable of abutting the tension rod. a second piston, which has a second rod formed in a long length and penetrates an air supply hole in the center, and is biased so as not to come into contact with each other at all times; When the second piston moves, the second rod comes into contact with the tension rod, and when the air pressure in the cylinder chamber rises to a predetermined value, it opens to communicate the air hole of the second rod with the cylinder chamber. An air supply device comprising a check valve.