JPH0717407U - Collet for tool chuck - Google Patents

Abstract

(57) [Summary] [Structure] The collet body 9 is provided with a split groove that is cut from the tip side thereof and extends in the axial direction.
An oil supply groove 13 for supplying cutting oil from the oil flow passage 5 in the chuck body 1 toward the peripheral surface of the blade portion 10b of the cutting tool 10 is provided on the inner peripheral surface of the entire length in the axial direction. [Effect] It is not necessary to form an oil hole or an oil groove in the cutting tool itself, and one tool chuck can be applied to a large number of tools, and the cost of the tool can be reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tool chuck collet having, for example, an oil flow passage in a chuck body, and a shank portion of a cutting tool inserted through a collet body in a chuck cylinder portion of the chuck body by a clamping cylinder. The present invention relates to a tool chuck collet adapted to supply cutting oil introduced into an oil flow passage in a chuck body to a blade portion of a cutting tool.

[0002]

[Prior art]

 In order to supply cutting oil from the oil flow passage to the tool blade in this type of tool chuck, conventionally, the tool is provided with an oil hole penetrating in the axial direction from the shank part to the blade part. Cutting oil is supplied to the tip of the blade, or an oil groove extending in the axial direction is formed on the outer peripheral surface of the shank, and the cutting oil is supplied to the peripheral surface of the blade through this oil groove. .

[0003]

[Problems to be solved by the device]

 Like the conventional tool chucks described above, in the method of supplying oil using the oil holes or grooves provided in the cutting tool, it is necessary to perform hole drilling or groove processing for each tool that is a consumable item, and the cutting tool has high hardness. Since the material is used, it is very difficult to make holes and grooves in the tool, which causes a problem that the tool cost rises.

According to the present invention, a collet for a tool chuck that can solve the above conventional problems by providing an oil supply groove on the inner peripheral surface of a collet body that is interposed between a chucking cutting tool and the tool. The purpose is to provide.

[0005]

[Means for Solving the Problems]

 The tool chuck collet of the present invention is provided with a split groove 11 which is cut from the tip side of the collet body 9 and extends in the axial direction. The inner peripheral surface of the collet body 9 is provided with cutting oil inside the chuck body 1. It is characterized in that an oil supply groove 13 that is supplied from the oil flow passage 5 toward the peripheral surface of the blade portion of the cutting tool is provided over the entire axial length.

In this tool chuck collet, as described in claim 2, when the oiltight packing 14 is attached to the rear end of the collet body 9 and the collet body 9 is housed in the chuck cylinder portion 3, A gap formed between the collet body 9 and the oil flow path 5 in the chuck body 1 is sealed by an oil-tight packing 14.

[0007]

【Example】

 Hereinafter, an example in which the present invention is applied to a center oil supply type tool chuck, that is, a tool chuck of a type in which cutting oil is supplied from a spindle side of a machine tool will be described with reference to the drawings. 1 to 3, reference numeral 1 denotes a chuck body, which has a taper shank portion 2 fitted to a spindle, a chuck cylinder portion 3 having a slight taper shape, and a manipulator grip portion 4, and the chuck body. An oil flow passage 5 communicating with the inside of the chuck cylinder portion 3 is concentrically provided inside the chuck 1. Reference numeral 6 denotes a tightening cylinder which is fitted onto the chuck cylinder portion 3 and has a tapered inner peripheral surface corresponding to the tapered outer peripheral surface of the chuck cylinder portion 3. Between the tightening cylinder 6 and the chuck cylinder portion 3. In addition, a large number of needle rollers 7 that revolve around the outer peripheral surface of the chuck cylinder portion 3 in a spiral shape are interposed.

A plurality of chuck grooves 8 having a cross-section as shown in FIG. 3 and extending in the axial direction of the chuck body 1 are provided on the inner peripheral surface of the chuck tubular portion 3 at equal intervals in the circumferential direction. There is. The straight shank portion 10a of the cutting tool 10 is fitted and inserted into the chuck tubular portion 3 via the collet body 9, so that the fastening tubular portion 6 is rotated in the fastening direction to elastically deform the chuck tubular portion 3. By reducing the diameter, the straight shank portion 10a of the tool 10 is tightened and fixed via the collet body 9.

As shown in FIG. 2 and FIG. 3, the collet body 9 is provided with axially extending split grooves 11 at equal intervals in the circumferential direction, and each split groove 11 is located on the tip side of the collet body 9. And is formed so as to have an uncut portion 12 at the rear end. On the inner peripheral surface of the collet body 9, as shown in FIGS. 1 and 3, an oil supply groove 13 for supplying cutting oil from the oil flow passage 5 toward the peripheral surface of the blade portion 10b of the cutting tool 10 is provided. The oil supply grooves 13 are provided over the entire length in the axial direction and at equal intervals in the circumferential direction, and each oil supply groove 13 is provided between the two adjacent dividing grooves 11, 11 in the circumferential direction so as not to overlap with the aforementioned dividing groove 11. It is arranged.

Further, as shown in FIGS. 1 and 3, when the collet body 9 is inserted into the chuck tube portion 3, the inner peripheral surface of the chuck body 1 and the outer peripheral surface of the rear end portion of the collet body 9 are separated from each other. Since there is a gap between them, an oil-tight packing 14 that seals this gap is previously attached to the rear end of the collet body 9, and when the collet body 9 is fitted into the chuck cylinder 3, the oil-tight packing 14 is used. The gap is closed and sealed. The oil-tight packing 14 is a cylindrical shape made of synthetic rubber or the like, and has a fitting step portion 14a on the outer peripheral surface tip side, and the rear end outer peripheral surface of the packing 14 is on the inner peripheral surface 1a of the chuck body 1. The collet body 9 is closely fitted and the rear end of the collet body 9 is tightly fitted to the fitting step portion 14a.

When using the tool chuck configured as described above, in a state where the taper shank portion 2 of the chuck body 1 is fitted to the spindle of the machine tool, the oil flow passage of the chuck body 1 is introduced from the inside of the spindle. Cutting oil is introduced into the inside of the collet body 9 as shown by the arrow in FIG. 1, passing through the inside of the oil-tight packing 14 from the oil flow passage 5 into the rear end of the collet body 9. The oil is passed through the oil supply groove 13 on the inner peripheral surface of the collet body 9 located along the outer peripheral surface of the tool shank portion 10a, and the oil flow passage 5 is sprayed along the thread groove portion 10c on the peripheral surface of the blade portion 10b. Supplied.

In this case, each split groove 11 of the collet body 9 is formed so as to be cut from the tip side of the collet and to have an uncut portion 12 at the rear end thereof, and moreover, the inner peripheral surface 1 a of the chuck body 1 is formed. Since the oil-tight packing 14 that seals a gap between the collet body 9 and the outer peripheral surface of the rear end portion of the collet body 9 is attached to the collet body 9, from the oil flow passage 5 to the oil supply groove 13 on the inner peripheral surface of the collet 9. The cutting oil that flows in does not leak outside the collet body 9. Further, when the pressure of the cutting oil in the oil flow passage 5 acts on the oil-contacting surface of the oil-tight packing 14, it uniformly acts on the entire oil-contacting surface according to the so-called Pascal principle. The outer peripheral surface of the rear end portion of the packing 14 and the outer peripheral surface of the tip side fitting stepped portion 14a firmly adhere to the inner peripheral surface 1a of the chuck body 9 and the rear end portion of the collet body 9, respectively.

FIG. 4 shows another embodiment, in which the shank portion 10 a of the cutting tool 10 is inserted into the chuck cylinder portion 23 of the chuck body 21 having the oil flow passage 25 via the tapered collet body 29. A tool chuck of a type in which the tightening cylinder 26 is fitted and screwed onto the outer circumference of the chuck cylinder 23, and the tip end of the tightening cylinder 26 is wedge-fitted to the tip end of the collet body 29. Shows. Although not shown, each split groove of the collet 29 is formed so as to be cut from the front end side of the collet body and have a cutout portion at its rear end, as in the previous embodiment. A plurality of oil supply grooves 13 are provided on the inner peripheral surface of the collet body 29. Further, as shown in the drawing, no gap is formed between the rear end portion of the collet body 29 and the inner peripheral surface of the chuck body 21, and therefore the oil-tight packing as described above is not provided. The distribution route of cutting oil is almost the same as that of the previous embodiment.

In the above embodiment, the center oil supply type chuck is used as the cutting oil supply method, but the chuck is not limited to the center oil supply type chuck, and the chuck body is rotatably supported. The so-called side oil supply method that introduces cutting oil into the oil flow passage inside the chuck body through the inside of the support member, or the end surface oil supply type chuck that introduces cutting oil from the end surface of the spindle into the oil flow passage inside the chuck body Can be applied.

[0015]

[Operation and effect of the device]

 According to the collet for a tool chuck of the present invention, the cutting oil introduced into the oil flow passage in the chuck body receives the oil on the inner peripheral surface of the collect body located along the outer peripheral surface of the tool shank portion from the oil flow passage. It is supplied to the peripheral surface of the blade through the supply groove from its tip. In this case, the split groove of the collet body is formed by cutting it from the tip side of the collet body and leaving an uncut portion at the rear end, so that the cutting oil flowing through the oil supply groove from the oil flow passage is collected by the collet body. Does not leak outside the body.

As described above, the collet for a tool chuck of the present invention is provided with an oil supply groove on the inner peripheral surface of the collet body, and the cutting oil introduced into the oil flow passage is collected by the oil supply groove. Since it is supplied to the peripheral surface of the blade of the tool without leaking to the outside of the main body, there is no need to form oil holes or grooves in the cutting tool itself as in the conventional chuck, and therefore one tool is used. The chuck can be applied to many tools and the tool cost can be reduced.

According to the second aspect, the oiltight packing is attached to the rear end portion of the collet body, and when the collet body is inserted into the chuck cylinder, the collet body and the chuck body are attached. Since the gap formed between the inner peripheral surface and the inner peripheral surface is sealed by the oil-tight packing, oil leakage to the outside of the collet body can be prevented.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a collet for a tool chuck showing a usage state of an embodiment of the present invention, which is a cross-section showing an oil supply groove on an inner peripheral surface of a collet body.

FIG. 2 is a vertical cross-sectional view of the above tool chuck, showing a split groove of a collet body.

FIG. 3 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 4 is a vertical cross-sectional view of a tool chuck collet showing a usage state of another embodiment.

[Explanation of symbols]

 1 Chuck Body 3 Chuck Cylinder 5 Oil Flow Path 6 Tightening Cylinder 9 Collet Main Body 10 Cutting Tool 10a Tool Shank 10b Tool Blade 11 Collet Body Split Groove 12 Collet Main Rear Uncut 13 Oil Supply Groove 14 Oil Tight packing 21 Chuck body 23 Chuck cylinder part 25 Oil flow passage 26 Tightening cylinder 29 Collet body

Claims (2)

[Scope of utility model registration request] 1. A collet body is provided with split grooves which are cut from the tip end side thereof and extend in the axial direction at appropriate intervals in the circumferential direction, and cutting oil is provided on the inner peripheral surface of the collet body for cutting tools. A collet for a tool chuck, characterized in that an oil supply groove that is supplied toward the peripheral surface is provided over the entire length in the axial direction. 2. The tool chuck collet according to claim 1, wherein an oil-tight packing is attached to the rear end of the collet body.