JPH06607U - Collet chuck - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a collet chuck capable of supplying a sufficient amount of cutting oil to a cutting tool having an oil hole and having sufficient strength. [Structure] A tapered collet 6 is inserted into the tip of the body of a main body 1 composed of a body 3 and a handle 5. By engaging the taper collet 6 and pulling the taper collet inward, an oil passage hole 17 having a sufficient area for oil to pass through is formed in the piece member 5 that clamps the cutting tool. The pins 16 inserted into the elongated holes 11 formed in the longitudinal direction of the main body 1 are made into a pair of short objects, the inner ends of which are planted on the surface of the bridge member 5, and the other ends of the pins are inserted in the longitudinal direction on the surface of the body 3. It is attached to the movable sleeve 15.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a collet chuck capable of sending cutting oil to a rotary cutting tool such as a drill or an end mill having an oil hole at its center.

[0002]

[Prior art]

 As shown in FIG. 3, the collet chuck inserts a taper collet 6 into an opening 2 that expands in diameter toward the tip of the main body 1 and holds the cutting tool inserted in the taper collet 6. A piece member 10 that engages with the taper collet 6 is inserted into a through hole 8 formed in the main body, and the piece member 10 is moved inwardly in the through hole to move the taper collet 6 inward. The cutting tool is clamped by pulling and constricting the inner circumference along the shape of the opening 2, or the piece member 10 is moved in the opposite direction to unclamp the cutting tool. Such clamps and unclamps are fitted with a sleeve 15 which is rotatable relative to the tightening nut via a ball 14 on the inner peripheral side of the tightening nut 13 screwed into the body portion 3 of the main body. One of the pins 16a, which is movable in the longitudinal direction by being guided by the elongated hole 11 formed in the body portion 3 of the first body, is passed through the piece member 10, and the other end of the pin 16a is formed on the inner peripheral surface of the sleeve 15. It is incorporated, and the tightening nut 13 is rotated to move the sleeve 15 along the elongated hole 11. Therefore, the cutting oil passes through the space formed between the oil passage hole 17 formed in the piece member 10 and the outer surface of the single pin 16a exposed in the oil passage hole (actual flat opening). No. 1-170531).

[0003]

[Problems to be solved by the device]

 However, in the conventional product, as shown in FIGS. 3 and 4, there is no choice but to reduce the thickness in the radial direction for engaging the sleeve 15 and the pin 13a due to restrictions on the outer diameter. For this reason, since the sleeve 15 and the pin 16a engage with each other in a small radial thickness, a large axial tightening force applied to the pin cannot be supported and the pin is largely curved. For this reason, not only cannot the clamping force be sufficiently received, but it is also extremely insufficient in terms of durability and strength. Also, since the pins are provided in the radial direction orthogonal to the center line of the main body, it is not possible to secure sufficient flow path for cutting oil, and it is extremely difficult to make this type of chuck chuck an oil hole type. It will be difficult. In addition, if an oil hole is to be provided by force, an oil passage or hole with a sufficient area for cutting oil to pass through the outer periphery of the pin must be provided, and there is inevitably a restriction on the pin thickness. , The strength of the pin is extremely reduced, which may cause the pin to break. It also has an adverse effect on the gripping force of the most important cutting tool.

[0004]

[Means for Solving the Problems]

 It is an object of the present invention to provide a collet chuck that secures a sufficient oil passage through which cutting oil can pass through a piece member and has sufficient strength. That is, the body is formed of a body portion having an opening portion that expands in diameter toward the tip and a handle portion that is inserted into the spindle of a machine tool. Insert a piece member that engages with the taper collet inserted in the part and has an oil passage hole at the center into the through hole, and insert a pin protruding perpendicular to the piece member into the elongated hole provided in the main body Further, the pin was incorporated into a sleeve screw-fitted to the body, and the pin was moved in the longitudinal direction by operating the sleeve to reduce the diameter of the taper collet, and the taper collet was accommodated in the taper collet. In a collet chuck that clamps a cutting tool, two short members are inserted into the elongated holes of the body of the main body, and the short members are protruded from the surface of the piece member so that Ensure a sufficient oil passage through which cutting oil can pass, and (EN) Provided is a collet chuck which is not likely to be broken in strength.

[0005]

When the tightening nut is rotated to move the bridge member and the sleeve to the right in FIG. 1, the taper collet is also moved to the right and the tightening force is transmitted in the axial direction. That is, the pair of pins symmetrically protruding from the bridge member without passing through the oil passage hole at the center of the bridge member move while maintaining sufficient strength. Then, the taper collet is reduced in diameter along the taper shape of the opening to clamp the cutting tool inserted therein. Further, when the tightening nut is rotated in the opposite direction, the sleeve moves in the opposite direction to the clamping direction as the tightening nut rotates, and the taper collet is used to release the clamping of the cutting tool. During cutting, the cutting oil is pressure-fed through the through hole, but it is drilled at the tip of the drill through an oil passage hole of a sufficient area that is drilled in the center of the piece member.

[0006]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, the collet chuck body 1 is composed of a body portion 3 having an opening 2 at one end and a tapered handle portion 5 having a diameter gradually decreasing toward the other end via a clamp portion 4. . In addition, an elongated hole 11 is bored from the surface of the body portion 3 at right angles to the through hole. The opening 2 has a taper shape whose inner diameter gradually increases toward the tip, and a taper collet 6 having a shape matching the taper shape is inserted. This taper collet is provided with several slits 7 in the longitudinal direction so as to have flexibility, and has the same structure as that conventionally used. Further, a through hole 8 is opened at the center of the collet chuck body 1, and cutting oil is pumped through the through hole toward the opening 2.

A piece member 10 is inserted into the through hole 8, and one end of the piece member is screwed into the inner peripheral surface of the taper collet 6. Further, an oil passage hole 17 is provided at the center of the piece member. Reference numeral 19 is an O-ring buried in the surface of the piece member to prevent the cutting oil from leaking to the outside from the elongated hole 11. A sleeve 15 that is relatively rotatable via a plurality of balls 14 is incorporated in a tightening nut 13 that is screwed into a male screw 12 on the outer peripheral surface of the body 3. The sleeve 15 is formed thick, and a pair of pins 16 inserted into the elongated holes 11 are deeply planted at right angles to the axis. Further, the inner end of the pin 16 is engaged with the outer peripheral surface of the piece member 10. Reference numeral 18 is a hooking groove formed on the outer peripheral surface of the tightening nut 13, and the nut can be rotated by engaging with a tool such as a spanner.

The operating state of the collet chuck according to the present invention will be described. When a rotating tool such as a spanner is engaged with the hooking groove 18 to rotate the nut 13, the tightening nut rotates and moves on the body 3. At this time, the sleeve 15 rotatably engaged with the nut 13 via the ball 14 is long while the rotation is stopped by the pin 16 inserted into the elongated hole 11 of the main body 1 as the nut moves. It moves longitudinally along the hole 11. Therefore, when the nut 13 and the sleeve 15 move to the right in FIG. 1, the taper collet 6 also moves to the right accordingly, and the tightening force is transmitted in the axial direction. That is, the taper collet 6 is forcibly reduced in diameter along the tapered shape of the opening to clamp the cutting tool inserted therein.

In this state, for example, when drilling a cutting tool using a drill, cutting oil is pumped from a tank (not shown) through the through hole 8. Then, the cutting oil is sent to the tip of the drill through the oil passage hole 17 formed at the center of the piece member 5 and drilled. Further, when the tightening nut 13 is rotated in the opposite direction to the above, the sleeve 15 moves to the left side in the drawing as the tightening nut rotates, and the cutting tool by the taper collet 6 is unclamped.

[0010]

【effect】

 The collet chuck according to the present invention comprises a body portion having an opening portion whose diameter is expanded toward the tip as described above, and a handle portion which is inserted into the spindle of a machine tool. In the main body having the hole formed therein, insert a piece member that engages with the taper collet inserted in the opening and has an oil passage hole at the center into the through hole, and insert a pin protruding orthogonally to the piece member. Insert the pin into a long hole provided in the main body, further incorporate the pin into a sleeve screw-fitted to the body, and operate the sleeve to move the pin in the longitudinal direction to reduce the diameter of the taper collet. This is an improvement of a collet chuck that clamps a cutting tool housed in the taper collet, in which two short members are inserted into the elongated holes of the body of the main body, and the short member is the surface portion of the piece member. Since it was made to project from. Since the sleeve 15 and the piece member 10 are fixedly engaged with each other at both ends of the pair of pins 16, an oil passage hole having a large cross-sectional area can be formed at the center of the piece member 10. ． In order to sufficiently remove the oil passage hole of the bridge member 10, the pin 16 can be thickened, and the strength of the pin can be increased. ． Despite the simple structure, the gripping force against the cutting tool is increased due to the strong component structure. It is more effective than conventional products such as.

[Brief description of drawings]

FIG. 1 is a half sectional view of an embodiment of the present invention.

2 is a cross-sectional view taken along the line II of FIG.

FIG. 3 is a half sectional view of a conventional product.

4 is a sectional view taken along line IV-IV of FIG.

[Explanation of symbols]

 1 Main body 2 Opening part 3 Body part 5 Handle part 6 Taper collet 8 Oil hole (through hole) 10 Piece member 11 Long hole 15 Sleeve 16 Pin (short material) 17 Oil passage hole

Claims (1)

[Scope of utility model registration request] 1. A main body comprising a body portion having an opening portion whose diameter increases toward the tip and a handle portion inserted into a spindle of a machine tool, and a body communicating with the handle portion and having an oil hole formed therein. An elongated hole provided on the main body with a pin member which is engaged with the tapered collet inserted in the opening and has an oil passage hole at the center, is inserted into the through hole, and a pin projecting orthogonally to the member is provided. , And then install the pin in a sleeve screwed to the body,
In the collet chuck that operates the sleeve to move the pin in the longitudinal direction to reduce the diameter of the taper collet and clamp the cutting tool housed in the taper collet, the collet chuck is inserted into the elongated hole of the body of the main body. A collet chuck characterized in that a pair of short members are used as the pins, the short members are provided so as to project from a surface portion thereof at right angles to the axial center of the piece member and are engaged with the sleeve.