JPS6012681Y2 - Tool holder for pre-tapping work - Google Patents

Description

[Detailed description of the invention] In the tapping operation, this invention uses air jet to remove chips generated by drilling into a pre-drilled hole, then supplies tap paste to the drilled hole, and performs tapping. The present invention relates to a tool holder for performing preliminary work for performing.

Conventionally, when tapping is performed using a numerically controlled machine tool, tapping is performed while spraying liquid cutting material after drilling.

However, the liquid cutting material lacks additives to prevent galling and has low viscosity, so galling may occur between the workpiece and the tap.

For this reason, it is common practice to inject tap paste into a drill hole in advance and perform tapping.

In addition, with the spread of machining centers, machine tools have become automated, but the work of injecting tap paste and removing chips from drilled holes still relies on humans, so there was a need to automate the work before tapping. .

The present invention was made to solve the above-mentioned technical problems, and includes an air injection mechanism that removes chips from the drill hole, an air injection mechanism that removes chips from the drill hole, and an air injection mechanism that injects tap paste by pressing against the end surface of the drill hole. An object of the present invention is to provide a tool holder that also incorporates an injection mechanism.

An embodiment of the present invention will be explained below based on the drawings.

FIG. 1 is a partially sectional view of the tool holder of the present invention.

Reference numeral 1 denotes a tapered shank tool holder, which has a shank portion 1a with which a grip portion of a tool exchange arm engages.

2 is a hollow cylindrical paste container whose one end is fixed in alignment with the axis of the shank portion 1a; 2a is a paste inlet provided on the cylindrical surface of the paste container 2; and 3 is a paste container that slides on the inner circumferential surface of the paste container 2. The piston 2 has a recessed mounting part 3a for mounting a spring on the holder 1 side;
A groove 3b is provided in the circumferential direction on one outer peripheral surface of a.

4 is a spring whose one end is brought into contact with the mounting part 3a and the other end is brought into contact with the end of a hole provided in the tool holder 1; 5 is a lid which is fastened to the other end of the paste container via a bolt 5a; Cylindrical portions 5b, 5c, and 5d are provided in the center of the lid 5, respectively, and a slope 5e is provided between the cylindrical portions 5b and 5c.

Reference numeral 6 designates a check valve that is slidable on the cylindrical portion 5bw5c, has a slope 6a corresponding to the tapered portion 5e, and has a flow path 6d through which the paste flows in the cylindrical portion corresponding to the cylindrical portion 5b. The figure shows the shape of the flow path 6d.
I-section is shown.

7 is a paste storage chamber composed of a paste container 2, a lid 5, and a piston 3; 7a is a paste chamber composed of a cylindrical portion 5c1; a check valve 6; and a flow path 9a; 9 is a hollow guide cylinder fixed to one side end of the lid body 5 via a bolt 8b; 9 is a hollow guide cylinder provided with a flow passage 9a penetrating in the axial direction in the center, supported by a spring 10 in the middle of the flow passage 9a The second steel ball 11
The plunger 9 is provided with a check valve that slides on the cylindrical portion 5d and the inner surface of one side end of the guide cylinder 8. A spring 12 applies tension between the stepped portion 9b and the end of the lid 5.

Reference numeral 13 denotes a nozzle fixed to one end of the plunger 9, and the nozzle 13 is provided with a tap paste pouring hole 13a that is continuous with the flow path 9a.

Reference numeral 14 designates a solenoid valve provided on the machine body side for opening and closing compressed air supplied from an air supply source (not shown), and is connected to a pipe 15 similarly provided on the machine body side.

Reference numeral 16 denotes a conduit tube fixed to one outer periphery of the paste container 2 and having a conduit passage 16a inside. One end of the conduit passage 16a is connected to the coupling 15a, and the other end is connected to the guide cylinder 8, It is electrically connected to a compressed air chamber 17 constituted by the lid 5 and the plunger 9, and is connected from the compressed air chamber 17 to an injection hole 13b provided in the nozzle 13 via a conduction path 18 provided in the plunger 9.

19 is a stopper pin mechanism, 19a is a stopper pin,
19b is a guide holder that guides the stopper pin 19a, and 19c is a spring that presses the stopper pin 19a inserted into the guide holder 19b in the direction of the piston 3.

Next, the operation of the tool holder of the present invention will be explained.

First, paste is injected into the paste storage chamber 7 from the paste injection port 2a. At this time, the stopper pin mechanism 19 is inserted into the paste container 2 and the tip of the stopper pin 19a is engaged with the groove 3b of the piston 3. The piston 3 is prevented from moving forward by the spring 4.

When the paste injection is finished, stopper pin mechanism 1
9 from the paste container 2.

When this tool holder is installed in a machining center and attached to a spindle using an automatic tool changer, the conductive pipe 16 and the coupling 15a are connected.

The conical part of the nozzle 13 is positioned with respect to the drilled hole, and compressed air is injected into the drill.

Compressed air is injected from the injection hole 13b via the piping 15, the conduit 16a1, the compressed air chamber 17, and the conduit 18 by giving a command to the solenoid valve 14 to open once using a command such as a tape on a numerically controlled machine tool. The inside of the drill hole can be cleaned.

Further, the paste in the storage chamber 7 of this tool holder is pushed forward by the piston 3 pressurized by the spring 4, opens the check valve 6 against the spring 6b, passes through the channels 6c and 6d, and passes through the channel 9a. is filled with.

Note that the paste storage chamber 7 is filled with tap paste in advance through the injection port 2a using a power grease gun.

When the pearst container 2 and the like move forward after the compressed air is injected, the nozzle 13 comes into contact with a drill hole (not shown) and is blocked from moving forward.

Subsequently, when the plunger 9 moves further forward, the plunger 9 relatively retreats, and the pressure in the flow path 9a and the paste chamber a becomes higher than the pressure in the paste storage chamber 7, and the check valve 6 retreats with the action of the spring 6b. , the tapered portion 6a is in close contact with the tapered portion 5c to prevent backflow.

Further, the steel ball 11 opens against the spring 10, and a predetermined amount of paste is discharged from the nozzle 13a toward the direction of the drill.

After discharge is completed, when the drill hole of the workpiece and the nozzle 13 are separated, the plunger 9 moves forward by the action of the spring 12 and stops at the locking position between the locking portion 8a and the stepped portion 9b.

Then, by relatively moving the aforementioned tool holder to the next drill hole and repeating the aforementioned operations, the tap paste can be automatically injected in sequence.

As described above, by using the tool holder of the present invention in a numerically controlled machine tool, it is possible to perform the incidental work related to tapping work, that is, to remove chips from the drill head, and to automatically supply tap paste. Unmanned driving has become possible.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of a part of the tool holder of the present invention. FIG. 2 is a sectional view taken along the line II in FIG. 1. 1: Tool holder, 2: Paste container, 3: Piston, 4
spring, 5: lid, 6: check valve, 7: paste storage chamber, 7a: paste chamber, 8 guide cylinder, 9
: Flow path, 10 springs, 11: m bulb, 12 springs, 14: Solenoid valve, 15: Piping, 16:
Conduit pipe, 17: Compressed air chamber, 18: Conduit path.

Claims (1)

[Scope of utility model registration request] A paste container is fixed to the tip of a tool holder to be inserted into a spindle of a machine tool and has a paste storage chamber inside the paste container, and a spring is stored in the tool holder side of the paste container and has one end in contact with the tool holder. a piston that is pushed to the opposite side of the tool holder to press the paste; a stopper pin mechanism that fixes the piston and blocks the pressing force when injecting the paste into the paste container; and a stopper pin mechanism that is located at the tip of the paste container. A lid body which is attached to the center and has a small-diameter cylindrical part 5b sequentially from the rear side, a large-diameter cylindrical part 5c connected to the slope, a small-diameter cylindrical part 5d, and the large-diameter cylindrical part 5c is used as a paste chamber; A first member is slidably inserted across the small-diameter cylindrical portion 5b and the large-diameter cylindrical portion 5c of the lid, has a slope corresponding to the slope, and has an axial groove in the small-diameter portion.
a check valve, a cylindrical guide cylinder fixed to the lid, and an axial flow channel inserted into the small diameter cylindrical portion 5d of the lid so as to be slidable while being guided by the guide cylinder. a second check valve comprising: a plunger which has a plunger which is pressed against the opposite side of the tool holder by a spring in contact with the prong end of the lid; a second check valve which is provided in the middle of the flow path of the plunger and includes a pole and a spring; a solenoid valve attached to the machine tool for opening and closing the flow of compressed air from a source; a conduction pipe fixed to the outer periphery of the paste container and connected downstream of the solenoid valve; and a compressed air chamber inside the guide cylinder connected via the lid, and a conduction path provided in the plunger and connected to the compressed air chamber;
A tool holder for performing pre-tapping work, comprising a nozzle having a paste pouring hole and a compressed air injection hole attached to the tip of the plunger and connected to the flow path and conduction path of the plunger.