JPH09309023A - Broach tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable sufficient cooling by effectively depriving tool of cutting heat. SOLUTION: In a broach too having a plurality of cutting edges 2 in the axial direction with a chip pocket 3 between the cutting edge 2 and the cutting edge 2, each of the chip pockets 3 has a fluid outflow port 5 for flowing out a fluid 4 into each of the chip pockets 4, a fluid inflow port 6 for flowing in the fluid 4 from each of the chip pockets 3 into the broach tool, a first fluid passage 7 communicating to each of the fluid outflow ports 5, and a second fluid passage 8 communicating to each of the fluid inflow ports 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broach tool having improved cooling performance by allowing a cooling liquid (coolant) to flow through a chip pocket.

[0002]

2. Description of the Related Art In the processing by a conventional broaching tool, as shown in FIG. To process. There is a space called a tip pocket 15 between the cutting edges 14.
Coolant 16 supplied from the outside at the time of processing and chips produced by the processing enter the chip pocket 15. Then, as soon as the processing is finished, the coolant and the chips are discharged.

[0003]

However, conventionally, because of the structure of the broach tool, the coolant in the chip pocket hardly flows out or flows in during machining, so that the cutting heat generated during cutting cannot be sufficiently cooled. Therefore, there are problems such as variations in machining accuracy, shortening of tool life, and deterioration of coolant due to cutting heat. An object of the present invention is to provide a broaching tool that can effectively remove cutting heat and cool it sufficiently.

[0004]

The present invention which achieves the above object is as follows. A broaching tool having a plurality of cutting blades in the axial direction and having a tip pocket between the cutting blades, wherein the broaching tool allows liquid to flow out to each tip pocket from a liquid outlet and each tip pocket. A broach tool in which a liquid inlet for allowing liquid to flow is formed, and a first liquid passage communicating with each liquid outlet and a second liquid passage communicating with each liquid inlet are formed in the broach tool.

In the above broach tool, the liquid from the first liquid passage flows into the tip pocket through the liquid outlet, and the liquid from the tip pocket flows into the second liquid passage through the liquid inlet. Since the liquid flows in the tip pocket, the liquid effectively removes the cutting heat generated during the processing of the broach tool and cools the broach tool.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A broaching tool according to an embodiment of the present invention will be described below with reference to FIG. In FIG.
The broach tool 1 has a plurality of cutting blades 2 in the axial direction, and has a chip pocket 3 between the cutting blades 2. In the broach tool 1, a liquid outlet 5 for letting out a liquid (cooling liquid, also called coolant) 4 into each tip pocket 3 and a liquid 4 from each tip pocket 3 for letting it flow into the broach tool. A liquid inlet 6 is formed. Further, each liquid outlet 5 is provided in the broach tool 1.
There is formed a first liquid passage 7 communicating with the above and a second liquid passage 8 communicating with each liquid inlet 6.

The first liquid passage 7 and the second liquid passage 8 may be connected to each other by a passage 9 outside the broaching tool 1, so that the liquid from the second liquid passage 8 is connected to the first liquid passage 7. Can be circulated. A pump (not shown, a pump on the machine side can be used) is provided in the passage 9, and the liquid is circulated by the pump.

The liquid outlet 5 to the tip pocket 3 is angled circumferentially and / or axially so as to maintain a constant flow in the tip pocket 3. In the case of the angle in the circumferential direction, the rotational direction of the flow may be left or right.
Liquid inlet 6 from tip pocket 3 into broach tool
Are angled in a direction opposite to the liquid outlet 5 into the tip pocket 3 so that the liquid can flow in smoothly.

The liquid inflow port 6 from the chip pocket 3 into the broaching tool has one chip pocket 3 so that the liquid flow in the chip pocket 3 is maintained even if the cutting chips during processing suddenly get caught. However, it is desirable to provide it in two or more places. A filter (not shown) may be provided at the liquid inlet 6 from the tip pocket 3 into the broaching tool for prevention.

Next, the operation will be described. Brooch tool 1
Due to this, broaching is performed. FIG. 1 shows a work 10
Although the case where the broach tool 1 is moved is shown, the broach tool 1 may be moved when the work 10 is stopped. The liquid (coolant) 4 sent from the machine side is supplied from the liquid outlet 5 to each chip pocket 3 through the first liquid passage 7.
Although the inside of the chip pocket 3 during processing of the workpiece 10 is almost sealed, the liquid supplied to the chip pocket 3 flows through the inside of the chip pocket 3 and the second liquid passage 8 from the liquid inlet 6 of the same chip pocket 3. Is discharged to. As a result, the liquid 4 forms a flow in the chip pocket 3 and does not become stagnant. When the first liquid passage 7 and the second liquid passage 8 are connected by the passage 9, the liquid 4 is returned to the first liquid passage 7 and circulates. The circulating power of the liquid is provided by a pump. The liquid inflow force into the liquid inflow port 6 is the suction force of the pump or the liquid ejection force of the liquid outflow port 5.

Due to the flow of the liquid 4 in the tip pocket 3, the cutting heat is taken by the liquid (coolant) 4, and the broach tool 1 is sufficiently cooled from the surroundings even at the tip pocket 3 site. Also, the liquid is chip pocket 3
Since it is prevented that the liquid (coolant) 4 stagnates and becomes high in temperature, deterioration of the liquid (coolant) 4 due to heat is also suppressed. Further, the positional relationship between the liquid outlet 5 and the liquid inlet 6 is selected so that the liquid 4 from the liquid outlet 5 flows through the tip pocket 3 almost all around in the circumferential direction and then flows out from the liquid inlet 6. By so doing, the fluid temperature in the tip pocket 3 becomes substantially uniform in the circumferential direction, and the broach tool 1 can be cooled substantially uniformly in the circumferential direction. As a result, the machining accuracy of the broach tool 1 becomes uniform in the circumferential direction, and there is no variation in the machining accuracy in the circumferential direction.
Also, no thermal strain is applied in the circumferential direction, extending the tool life.

[0012]

According to the broaching tool of the present invention, the broaching tool is provided with a liquid outlet for letting out the liquid into each tip pocket and a liquid inlet for letting in the liquid from each tip pocket. Since the first liquid passage that communicates with the liquid outlet and the second liquid passage that communicates with each liquid inlet are formed, it is possible to create a flow in the liquid in the chip pocket, and this flowing liquid (does not stagnant). With this, the cutting heat of the broach tool can be effectively removed, and the broach tool can be effectively cooled.

[Brief description of drawings]

FIG. 1 is a side view of a broaching tool according to an embodiment of the present invention.

FIG. 2 is a side view of a conventional broaching tool.

[Explanation of symbols]

 1 Broach Tool 2 Cutting Edge 3 Tip Pocket 4 Liquid (Coolant) 5 Liquid Outlet 6 Liquid Inlet 7 First Liquid Passage 8 Second Liquid Passage 9 Passage 10 Workpiece

Claims (1)

[Claims] 1. A broaching tool having a plurality of cutting blades in the axial direction and having a tip pocket between the cutting blades, wherein the broaching tool has a liquid outlet for letting out a liquid into each tip pocket. A liquid inflow port through which liquid from each tip pocket is introduced is formed, and a first liquid passage communicating with each liquid outflow port and a second liquid passage communicating with each liquid inflow port are formed in the broach tool. Broaching tool.