WO2012118245A1

WO2012118245A1 - Double-sided binding shrink-fit chuck to which an inner screw-type shrink-fit collet is applied

Info

Publication number: WO2012118245A1
Application number: PCT/KR2011/004031
Authority: WO
Inventors: 이현주
Original assignee: Lee Hyun Joo
Priority date: 2011-02-28
Filing date: 2011-06-02
Publication date: 2012-09-07
Also published as: KR101035565B1

Abstract

The present invention relates to a double-sided shrink-fit chuck to which an inner screw-type shrink-fit collet is applied. According to the present invention, endmills having various sizes may be combined and alternatively used as one holder when necessary. Also, the endmills may be stably assembled and used without damaging a screw part.

Description

Rear bound shrink fit chuck with inner screw shrink fit collet

The present invention relates to a back restraint shrink fit chuck having a guide surface, and more particularly, it is possible to replace and use endmills of various specifications as a single holder as needed, and to stably prevent damage of the screw portion. The present invention relates to a rear constriction shrink fit chuck to which an inner threaded shrink fit collet can be assembled and used.

The present invention relates to a back restraint shrink fit chuck having a guide face.

In general, the milling machine comprises a frame having a base; A table member installed to reciprocate in the X-axis direction with respect to the base; A spindle head assembly having a chuck fixed with a tool capable of processing a workpiece, the spindle head assembly being installed perpendicular to the table member; It includes a transfer unit for reciprocating the table member in the X-axis direction.

Here, the spindle head assembly, the spindle motor (not shown) for providing a rotational force of a predetermined number of revolutions and the rotational movement is received by the rotational force of the spindle motor, the spindle (not shown) to which a conventional tool (not shown) is fastened Include.

At this time, the conventional spindle, the other end is provided with a mating groove (not shown) so that the chuck (not shown) to which the tool is fixed is formed, which is a spindle-side tapered surface forming a certain angle and the seat is seated It is made of a surface, while the chuck consisting of the holder and the collet is pulled by the drawing bolt protruding through the mating groove, the tapered surface formed on the holder side is coupled to the spindle-side tapered surface.

However, in the state in which the spindle and the chuck according to the prior art are coupled, in detail looking at the coupling state between the collet and the holder to which the tool is coupled, only the holder side taper surface and the collet side taper surface are joined, and thus, the cross-sectional reference The seating surface on the collet side and the seating surface on the holder side were still bonded to each other.

Therefore, as the rotation of the collet, in which the tool is fixed during milling, is rapidly generated, vibration is sharply generated, thereby reducing the life of the tool, reducing the surface roughness of the tool, and extending the processing time.

In order to supplement the above-mentioned problem, the Utility Model Registration No. 0449753 has been proposed.

However, in the case of the back restraint shrink fit chuck described in the Utility Model No. 0449753, the collet screw method is applied as shown in Figs. 1 and 2, but the above-mentioned problems are overcome, but the screw part is damaged by the collet screw method. And assembly problems.

An object of the present invention devised to solve the above problems is to form a screw portion on the inner circumferential surface of the upper end of the shrink fit collet and to apply the inner screw method in which the collet fastening screw groove of the collet assembly member is inserted into the upper end of the shrink fit collet. As a result, it is possible to replace and use endmills of different specifications as one holder as needed, and to prevent the damage of the screw parts. To provide a chuck.

According to a feature of the present invention for achieving the object as described above, the present invention is the upper end portion can be coupled to the spindle, the lower end holder taper surface penetrating inward with respect to the outermost holder seating surface 160 The holder guide surface 130 and the holder guide surface 130 extending from the 140 and the holder tapered surface 140 to form an inner circumferential surface parallel to the centerline of the holder tapered surface 140 are fastened to the support member. A holder forming a collet insertion groove 150 having a screw groove surface 170; It is coupled to the support member fastening screw groove surface 170, the seating portion 320 and the penetrating portion 310 penetrating up and down are formed in order from the upper side to the lower side, the diameter of the seating portion 320 is the through portion 310 It is formed larger than the diameter of the support member to form a seating surface 330 of the step shape between the seating portion 320 and the through portion 310 therein; The head portion 410 seated on the seating surface 330 of the seating portion and the connecting portion 420 connected to the head portion and penetrating the through portion 310 and the connecting portion are protruded to the lower side of the support member and the outer peripheral surface Collet assembly member to form a collet fastening screw groove 430 in the; At the upper end, a collet taper surface 240 which is in surface contact with the holder taper surface and a collet guide surface 230 which is extended to the collet taper surface and is in surface contact with the holder guide surface 130 are formed on the outer circumferential surface and a screw portion ( An insertion part 220 through which the collet fastening screw groove part 430 is inserted and fastened is formed, and a stepped part 250 having a collet seating surface 260 abutting on the holder seating surface 160 is formed in the center portion 210. ) Is formed, the bottom portion shrink shrink collet 200 which can be cut in the inner end mill; It includes.

In addition, the collet assembly member is further formed with a through hole 450 penetrating up and down, the holder further comprises a cap member 500 for fixing the head of the collet assembly member on the seating surface, The cap member is characterized in that a hole communicating with the through hole is formed.

In addition, it characterized in that it further comprises a ring-shaped O-ring (O-ring) between the inner peripheral surface of the through portion formed in the support member and the outer peripheral surface of the connecting portion of the collet assembly member.

In addition, the inner peripheral surface of the collet insertion groove is characterized in that the stop ring 600 for supporting the lower side of the support member is coupled.

According to the present invention as described above, not only can be used by replacing the combination of the end mills of various specifications as a single holder, but also the shrink fit collet of the inner thread type that can be assembled and used stably without damage to the screw portion This can provide an applied backrest shrink fit chuck.

1 and 2 are diagrams showing the configuration of the back restraint shrink fit chuck according to the prior art (Registration Utility Model No. 0449753).

Figure 3 is a cross-sectional view showing the configuration of the rear constriction shrink fit chuck is applied to the inner screw portion shrink fit collet according to a preferred embodiment of the present invention.

4 is a cross-sectional view of the support member.

5 is a cross-sectional view of the collet assembly member.

FIG. 6 is an enlarged view of a portion 'A' shown in FIG. 3.

7 is an assembled cross-sectional view of the rear constriction shrink fit chuck to which the inner screw shrink fit collet of the present invention is applied.

100: holder 110: screw groove

111: stud bolt tightening groove 130: holder guide surface

140: holder tapered surface 150: collet insertion groove

160: holder seating surface 170: support member fastening screw groove surface

200: shrink fit collet 210: screw portion

220: insertion portion 230: collet guide surface

240: collet tapered surface 250: stepped portion

260: collet seating surface 270: end mill insertion hole

300: support member 310: through part

320: seating portion 330: seating surface

400: collet assembly member 410: head

420: connecting portion 430: collet tightening screw groove

450: through hole 500: cap member

600: stop ring 700: O-ring

Specific details of other embodiments are included in the detailed description and the drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, the present invention will be described with reference to the drawings for explaining a back-constrained shrink fit chuck to which an inner threaded shrink fit collet is applied according to embodiments of the present invention.

Figure 3 is a cross-sectional view for showing the configuration of the rear constriction shrink fit chuck applied to the inner screw type shrink fit collet according to a preferred embodiment of the present invention, Figure 4 is a cross-sectional view of the support member, Figure 5 is a cross-sectional view of the collet assembly member 6 is an enlarged view of a portion 'A' shown in FIG. 3, and FIG. 7 is an assembled cross-sectional view of the rear constriction shrink fit chuck to which the inner screw shrink fit collet of the present invention is applied.

The rear constriction shrink fit chuck to which the inner screw-type shrink fit collet is applied according to a preferred embodiment of the present invention may be coupled to the spindle at the upper end, and penetrate inward in the lower part based on the outermost holder seating surface 160. Extends to the holder taper surface 140 and the holder taper surface 140, the holder guide surface 130 and an inner circumferential surface formed parallel to the centerline of the holder taper surface 140, and the holder guide surface 130. And a holder 100 for forming a collet insertion groove 150 having a support member fastening screw groove surface 170, and a seating portion 320 coupled to the support member fastening screw groove surface 170 and penetrating up and down. The through part 310 is sequentially formed from the upper side to the lower side, but the diameter of the seating part 320 is larger than the diameter of the through part 310, so that the seating part 320 and the through part 310 are disposed therein. Forming the seating surface 330 of the step shape The connecting member 420 connected to the head member 410, the head part 410 seated on the seating surface 330 of the seating part 320, and the head part 410 and penetrating the through part 310. And a collet assembly member 400 connected to the connection part 420 and protruding to the lower side of the support member 300 to form a collet fastening screw groove 430 on an outer circumferential surface thereof, and a collet which is in surface contact with the holder taper surface at an upper end thereof. A collet guide surface 230 extending from the tapered surface 240 and the collet tapered surface to be in surface contact with the holder guide surface 130 is formed on an outer circumferential surface thereof, and a threaded portion 210 is formed on an inner circumferential surface of the collet fastening screw groove portion ( 430 is inserted into the insertion portion 220 is formed and the central portion is formed with a stepped portion 250 is provided with a collet seating surface 260 in contact with the holder seating surface 160 and the end mill is shrinking inward Shrink fit collet 200 which may be included.

That is, the back restrained shrink fit chuck to which the shrink fit collet of the inner thread type according to the present invention is applied to the holder 100, shrink fit collet (Shrink Fit Collet, 200), support member 300, and collet assembly member 400. It includes.

One end, that is, the upper end, of the holder 100 is formed such that an outer circumferential surface thereof is coupled to the mating groove H of the spindle S (see Background Art and Utility Model No. 0449753).

The lower end of the holder 100 is formed with a collet insertion groove 150 inward.

A holder seating surface 160 is formed at the outermost bottom of the holder 100 at which the collet insertion groove 150 starts.

The inner circumferential surface of the collet insertion part 150 formed inside the lower end of the holder 100 has a holder taper surface 140 penetrating inwardly of the holder 100 with respect to the holder seating surface 160. The holder guide surface 130 extending to the holder taper surface 140 and parallel to the centerline Y of the holder taper surface 140, and the support member fastening extending to the holder guide surface 130 are formed. It consists of a screw groove surface (170).

At this time, the center line Y of the holder taper surface and the center line X of the spindle to the center line Z of the collet tapered surface 240 to be described later are on the same line, and the holder guide surface 130 and the support member fastening screw The groove surface 170 is formed to be parallel to the X, Y and Z lines.

The support member 300 is coupled to the support member fastening screw groove surface 170 forming the inner circumferential surface of the collet insertion groove 150.

In this case, as shown in FIG. 4, the support member 300 has a hole-shaped seating portion 320 formed at an upper side thereof, and a through-hole 310 having a hole shape communicating with the seating portion 320 at a lower side thereof. Is formed.

Holes through which the support member 300 is vertically penetrated by the seating part 320 and the penetrating part 310 are formed.

In this case, the diameter of the eye rest part 320 is formed to be larger than the diameter of the through part 310, so that a stair-shaped seating surface 330 is formed at a boundary between the seat part 320 and the through part 310. do.

As shown in FIG. 5, the collet assembly member 400 includes a head portion 410 having a large diameter and a connection portion 420 having a smaller diameter than the head portion and extending from the head portion 410. An extension of 420 is composed of a collet fastening screw groove 430 is formed with a screw groove on the outer peripheral surface.

At this time, the head portion 410 is seated on the seating surface 330 of the seating portion 320 formed in the support member 300, the connecting portion 420 is a through portion 310 of the support member 300. Is disposed to pass through, the collet fastening screw groove 430 is protruded out of the support member 300.

At this time, the seating portion 320 of the support member 300 and the head portion 410 of the collet assembly member 400 seated on the seating portion 320 is formed in a polygonal shape so that the head portion 410 is It is preferable to be fixed to the seating portion 320.

At this time, a through hole 450 is formed which communicates from the head to the collet fastening screw groove, and the bottom surface of the collet assembly member 400 is communicated from the upper side by the through hole.

The fluid such as cutting oil may be supplied to the end mill insertion hole 270 of the shrink fit collet 200 through the through hole 450.

In this case, the cap member 500 may be coupled to an upper surface of the holder to form the collet insertion groove 150 of the holder 100.

The cap member 500 is the head portion in the seating portion 320 so that the head 410 of the collet assembly member 400 seated on the seating portion 320 of the support member 300 is fixed without shaking. 410 is coupled to be in close contact with.

At this time, the cap member 500 also has a hole in communication with the through-hole 450 of the collet assembly member 400 is formed.

In addition, an O-ring 700 may be inserted between the inner circumferential surface of the through part 310 formed in the support member 300 and the outer circumferential surface of the connecting portion 420 of the collet assembly member 400.

The O-ring 700 is a ring-shaped ring made of a rubber material or the like, and serves to seal between the through part 310 and the connection part 420.

In addition, the stop ring 600 may be further coupled to a boundary between the support member fastening screw groove surface 170 to which the support member 300 is fastened and the holder guide surface 130.

The stop ring 600 is configured to be fixed to the support member 300 is fastened to the support member fastening screw groove surface 170, a washer (Washer) and the like can be used.

That is, by further including a stop ring 600 for supporting the lower surface of the support member 300 on the inner circumferential surface of the collet insertion groove 150, the support member 300 can be supported to be fixed.

The shrink fit collet 200 has a collet tapered surface 240 and a collet guide surface 230 extending to the collet tapered surface 240 at one end, that is, the outer peripheral surface of the upper end portion.

As described above, the collet taper surface 240 and the collet guide surface 230 are formed to be in surface contact with the holter taper surface 140 and the holder guide surface 130, respectively.

At this time, the upper portion of the shrink fit collet 200, the insertion portion 220 is formed with a screw portion 210 is formed on the inner peripheral surface.

That is, the upper end of the shrink fit collet 200 is inserted into the collet insertion groove 150 of the holder 100, the collet screw thread 430 of the collet assembly member 400 and the screw portion 210 By screwing, the holder 100 and the shrink fit collet 200 can be fastened by the inner thread method.

The step portion 250 having the collet seating surface 260 which is in surface contact with the holder seating surface 160 is formed at the center of the shrink fit collet 200.

In addition, an end mill insertion hole 270 through which an end mill may be shrinked inward is formed at a lower end of the shrink fit collet 200.

The shrink fit collet 200 is formed to penetrate up and down by the insertion part 200 and the end mill insertion hole 270.

As described above, the support member 300 is coupled to the upper end of the collet insertion groove 150 of the holder 100, the collet assembly member 400 is fixed to the support member 300, the collet assembly member 400 The collet tightening screw groove 430 is inserted into the insertion part 220 formed inside the upper end of the shrink fit collet 200 so as to be fastened, so that the prior art (see Utility Model No. 0449753) A screw portion is formed on the outer circumferential surface of the upper end portion, and thus it is possible to prevent breakage of the screw portion frequently generated in the collet screw method of directly fastening the screw groove formed on the inner circumferential surface of the lower end portion of the holder.

Matters relating to the configuration in which the upper end of the holder 100 is coupled to the spindle are as described in the Utility Model Registration No. 0449753.

Those skilled in the art will appreciate that the present invention can be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is indicated by the scope of the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and the equivalent concept are included in the scope of the present invention. Should be interpreted.

Claims

The upper end may be coupled to the spindle, and the lower end of the holder may have a holder taper surface penetrating inward with respect to the outermost holder seating surface and the holder taper surface to form an inner circumferential surface parallel to the centerline of the holder taper surface. A holder extending to a guide surface and the holder guide surface to form a collet insertion groove having a support member fastening screw groove surface;

It is coupled to the support member fastening screw groove surface, and the seating portion and the penetrating portion penetrating up and down are formed sequentially from the upper side to the lower side, the diameter of the seating portion is formed larger than the diameter of the penetrating portion therein step between the seating portion and the penetrating portion therein Support member to form a seating surface of the form;

A collet assembly member connected to the head part seated on the seating surface of the seating part and the head part connected to the connection part and the connection part penetrating the through part, protruding downward from the support member, and forming a collet fastening screw groove part on an outer circumferential surface thereof;

At the upper end, a collet taper surface which is in surface contact with the holder taper surface and a collet guide surface which is extended to the collet taper surface and are in surface contact with the holder guide surface are formed on the outer circumferential surface and a thread is formed on the inner circumferential surface to insert the collet screw thread groove portion. Insertion is fastened is formed, the central portion is formed with a stepped portion is provided with a collet seating surface in contact with the holder seating surface, the bottom portion shrink shrink collet that can be cut in the inner end mill; Rear constriction shrink fit chuck is applied to the inner screw shrinkage collet including a.
The method of claim 1,

The collet assembly member is further formed with a through hole penetrating up and down,

The holder further includes a cap member for fixing the head of the collet assembly member on the seating surface,

The cap member is a rear constriction shrink fit chuck applied to the shrink fit collet of the inner thread type, characterized in that the hole is formed in communication with the through-hole.
The method of claim 1,

A rear constriction shrink fit chuck to which the inner screw type shrink fit collet is further provided between an inner circumferential surface of the through member formed in the support member and an outer circumferential surface of the connecting portion of the collet assembly member. .
The method of claim 1,

The inner circumferential surface of the collet insertion groove is a back shrinkage shrink fit chuck applied to the shrink fit collet of the inner thread type, characterized in that the stop ring 600 for supporting the lower side of the support member is coupled.