KR200467281Y1 - The axis structure for a tap collet - Google Patents

Abstract

The present invention relates to a tab mounting shaft of a tab collet. When a tapping machine or a chip is cut when machining with a tap in a NC or other causes, the resistance of the tap rotation may be damaged or broken. It was developed to solve the problem that the ball in contact with the ball when the ball inside the conventional tab collet to move away from the ball seating groove to easily prevent damage caused by wear;
It is formed in the shape of a cylinder is formed in the middle portion of the separation prevention groove is reduced in its outer diameter, the separation prevention groove is formed with several recessed ball seating grooves at a predetermined interval, each ball seating groove is a part of the spherical ball A tab mounting shaft configured to be inserted therein; The inner diameter of the upper part is formed in a cylindrical shape so that the tab mounting shaft is inserted and rotated corresponding to the outer diameter of the tab mounting shaft, and extends to an upper end adjacent to the ball seating groove of the tab mounting shaft, and the ball inserted into the ball seating groove In order to be inserted, several ball avoidance grooves having a shape recessed at least larger than the diameter of the ball in the inner diameter direction in the normal direction from the center of rotation are formed, and the inner diameter from the top of the center of the ball inserted into the ball avoidance groove to the bottom is lower. A housing extending stepwise and extending downward, wherein a thread is formed on an inner circumferential surface of the end thereof; An inner diameter corresponding to an outer diameter of the tab mounting shaft, and an outer diameter corresponding to a lower inner diameter of the housing, wherein an upper surface of the pressing ring has an inclined surface formed to be inclined from the center to an outer angle; An inner diameter corresponds to an outer diameter of the tab mounting shaft, and an outer diameter of a coupling ring to which a thread corresponding to a lower thread of the housing is formed and coupled; In the tab mounting shaft of the tab collet composed of elastic means mounted between the pressing ring and the coupling ring;
The release preventing groove is formed to be in contact with the ball along the curved surface consisting of a groove having the same radius of curvature as the ball;
The edge that is the boundary between the ball seating groove and the departure preventing groove is curved in the first and second round parts according to the rotation direction, but is formed in the direction in which the ball is seated in the ball seating groove rather than the direction in which the ball is seated away from the ball seating groove. The place is configured to round with a larger radius of curvature;
The upper inclined surface of the pressing ring relates to the tab mounting shaft of the tab collet, characterized in that the vertically extending line of the ball avoiding groove is formed with a torque increasing groove extending in the normal direction with the same radius of curvature as the ball.

Description

The axis structure for a tap collet

The present invention relates to the tab mounting shaft of the tab collet, more specifically, when the ball inside the tab collet is moved by the ball prevention groove by moving the inner ball away from the ball seating groove by a certain amount of resistance to the rotation of the tab. It relates to the tab mounting shaft of the tab collet developed to solve the problem that the ball is deformed or worn by the pressure of the outer surface and the separation prevention groove of the line.

Tab machining is a process of forming a screw hole. In most cases, a thread is formed by inserting a tab into a hole drilled by a drill in advance. In some cases, a tap is used to simultaneously perform hole drilling and thread formation. .

This tapping may look similar to a drilled work, but the big difference is that the speed of forward or retreat with constant rotation must be constant for accurate thread formation.

Therefore, when tapping, ie tapping, the cutting chip is not discharged smoothly during machining, or the thread is broken or machined when the torque and pressure are continuously applied when the tap is subjected to excessive rotation resistance due to other causes. This happens if it is lost.

Therefore, a tap collet is used in a device for processing using a tapping machine or an NC to prevent the loss of the tap by causing the rotational force of the chuck connected thereto to be idling when the tap receives excessive rotational resistance.

The structure of the tab collet is connected to the axis of the tapping machine or NC and has a locking protrusion corresponding to the locking groove of the chuck having a protruding locking groove at the end thereof, the cylindrical housing is coupled to interlock, and the tab is mounted on the lower portion of the housing Consists of a tab mounting shaft inserted into the space, the ball is released from the ball seating groove when a resistance to a certain rotation or more occurs by the ball seating groove is inserted into the ball between the ball and the ball is inserted The housing is configured to idle.

At this time, when the ball is separated from the ball seating groove, there is no proper means for connecting the tab mounting shaft and the housing, so that the present inventors solve the problems such as the tab mounting shaft is pulled out of the Utility Model Registration Application No. 20-2009- It is proposed to solve this problem by adding a departure prevention groove by applying the 0009436 (original application of Published Utility Model Publication No. 20-2011-0000948) 'tab mounting shaft of the step collet'.

However, in such a source, since the contact of the ball separation prevention groove and the pressure ring is made of a line contact, the ball is deformed or worn by the pressure, and the pressure ring is also worn, causing a problem such that the proper pressure of the spring is lowered.

The present invention has been developed to solve the above problems, the purpose of the ball between the tab mounting shaft and the housing ball is not a line contact when contacting the release prevention groove and the lower pressure ring to the ball seating groove It is to develop a tab mounting shaft to contact along the curved surface of the to prevent wear and deformation.

In addition, it is to develop a tab mounting shaft that allows the ball to be more easily inserted back into the ball seating groove compared to the speed of rotation while making the ball more smoothly.

In order to achieve the above object, the present invention is formed in a cylindrical shape, the middle part of which is formed a separation prevention groove which is reduced in its outer diameter, and the separation prevention groove is formed with several recessed ball seating grooves at a predetermined interval. A tab mounting shaft configured to insert a portion of a spherical ball into each ball seating groove; The inner diameter of the upper part is formed in a cylindrical shape so that the tab mounting shaft is inserted and rotated corresponding to the outer diameter of the tab mounting shaft, and extends to an upper end adjacent to the ball seating groove of the tab mounting shaft, and the ball inserted into the ball seating groove In order to be inserted, several ball avoidance grooves having a shape recessed at least larger than the diameter of the ball in the inner diameter direction in the normal direction from the center of rotation are formed, and the inner diameter from the top of the center of the ball inserted into the ball avoidance groove to the bottom is lower. A housing extending stepwise and extending downward, wherein a thread is formed on an inner circumferential surface of the end thereof; An inner diameter corresponding to an outer diameter of the tab mounting shaft, and an outer diameter corresponding to a lower inner diameter of the housing, wherein an upper surface of the pressing ring has an inclined surface formed to be inclined from the center to an outer angle; An inner diameter corresponds to an outer diameter of the tab mounting shaft, and an outer diameter of a coupling ring to which a thread corresponding to a lower thread of the housing is formed and coupled; In the tab mounting shaft of the tab collet composed of elastic means mounted between the pressing ring and the coupling ring;

The release preventing groove is formed to be in contact with the ball along the curved surface consisting of a groove having the same radius of curvature as the ball;
The edge that is the boundary between the ball seating groove and the departure preventing groove is curved in the first and second round parts according to the rotation direction, but is formed in the direction in which the ball is seated in the ball seating groove rather than the direction in which the ball is seated away from the ball seating groove. The place is configured to round with a larger radius of curvature;

The upper inclined surface of the pressing ring is characterized in that the torque increasing groove extending in the normal direction with the same radius of curvature as the ball on the vertical extension line of the ball avoiding groove is further formed.

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As described above, the present invention has an effect of preventing the wear of the pressure ring and the ball from being worn or damaged by pressure by allowing the ball to come out of the ball seating groove so that the inner side is in contact with the release preventing groove and the bottom thereof contacts the pressure ring. There is.

In addition, the contact with the pressure ring is made in contact with the surface is the resistance to move the ball along the pressure ring is large, there is an effect that the idling only when a greater torque is generated.

1 is a perspective view of an embodiment of the present invention;
2 is an exploded perspective view according to one embodiment of the present invention.
Figure 3 is a cross-sectional view of an embodiment of the present invention,
Figure 4a to 4b is a partial cross-sectional view showing the operation according to the departure prevention groove according to an embodiment of the present invention
5a to 5b is a partial cross-sectional view showing the operation according to the torque increasing groove according to an embodiment of the present invention
6a to 6b is a conceptual diagram according to another embodiment of the present invention

Hereinafter, the structure of the present invention will be described in detail so that a person skilled in the art can easily understand and reproduce the same.

1 is a perspective view according to an embodiment of the present invention, Figure 2 is an exploded perspective view according to an embodiment of the present invention, Figure 3 is a front sectional view according to an embodiment of the present invention, made of a cylindrical shape A separation prevention groove 32 is formed in the middle portion, the outer diameter of which is reduced, and the separation prevention groove 32 is formed with several recessed ball seating grooves 31 at a predetermined interval, and each ball seating groove 31 is formed. A tab mounting shaft 3 configured to insert a portion of the spherical ball 4; The inner diameter of the upper portion is formed in a cylindrical shape so that the tab mounting shaft 3 is inserted and rotated corresponding to the outer diameter of the tab mounting shaft 3 and is adjacent to the ball seating groove 31 of the tab mounting shaft 3 coupled thereto. A plurality of shapes extending to the upper end and having a shape recessed at least larger than the diameter of the ball 4 at the inner diameter surface in the normal direction at the center of rotation so that the ball 4 inserted into the ball seating groove 31 can be inserted. A ball avoiding groove 51 is formed, and the inner diameter extends from the upper portion of the center of the ball 4 inserted into the ball avoiding groove 51 to the lower side and extends downward, and the thread 52 is formed on the inner peripheral surface of the end thereof. A housing 5; The inner diameter corresponds to the outer diameter of the tab mounting shaft (3), the outer diameter is inserted corresponding to the lower inner diameter of the housing (5), the upper surface is a pressing ring formed with an inclined surface 61 inclined from the center toward the outer angle ( 6); An inner diameter corresponds to an outer diameter of the tab mounting shaft (3), and an outer diameter of a coupling ring (7) for forming and engaging a thread (71) corresponding to the lower thread (52) of the housing (5); In the tab mounting shaft of the tab collet composed of elastic means (8) mounted between the pressing ring (6) and the coupling ring (7);

The departure preventing groove 32 is formed to be in contact with the ball (4) along the curved surface consisting of a groove having the same radius of curvature as the ball (4);

The upper inclined surface 61 of the pressing ring 6 is further formed with a torque increasing groove 62 extending in the normal direction with the same radius of curvature as the ball 4 on a vertical extension line of the ball avoiding groove 51. The tab mounting axis of the tab collet is characterized by the following.

Its operation is that the rotational force of the chuck 1 is transmitted to the housing 5 by the locking groove 11 (see Fig. 1) and the locking projection 53, the ball avoiding groove 51 of the housing 5 A part of the ball 4 inserted into the center of the rotation shaft by the pressure ring 6 is inserted into the ball seating groove 31 of the tab mounting shaft 3, so that the tab mounting shaft 3 is also the same. When excessive resistance is generated in the tab 2, the ball 4 is pulled out of the ball seating groove 31 inserted less than half of the ball 4. The rotational force transmission to) is delayed.

At this time, the release preventing groove 32 is to prevent the tab mounting shaft (3) from escaping from a predetermined position so that the ball (4) does not escape from the separation preventing groove 32 even if the ball from the ball seating groove (31). It is.

Figure 4a to 4b is a partial cross-sectional view showing the operation according to the departure prevention groove according to an embodiment of the present invention, the biggest difference between the conventional departure prevention groove and the departure prevention groove 32 of the present application is the ball and It is made of the same curvature.

In this case, when the ball 4 is in contact with the outer surface of the ball when the ball 4 is released from the ball seating groove 31 by the load and positioned in the release preventing groove 32 as shown in FIG. To prevent or adversely affect the durability of the device.

5a to 5b are partial cross-sectional view showing the operation according to the torque increasing groove according to an embodiment of the present invention, the ball 4 in the process of exiting and re-entering the ball 4 from the ball seating groove 31 is the center of rotation It reciprocates in the normal direction with respect to.

At this time, the reciprocating point is the reciprocating motion is made only in a certain portion of the pressure ring (6), the part is worn and as a result the pressure applied to the elastic means (8: Fig. 2) is reduced, so that the fire more easily In other words, the tap mounting shaft is idling even though the device is properly loaded.

Therefore, when the torque increasing groove 62 is formed in advance and the elastic means 8 is appropriately mounted thereon, there is an effect of reducing wear.

In addition, the torque increasing groove 62 also has a surface contact, so that the resistance is increased as compared to the ball 4 coming out of the line contact to be able to achieve a more optimal device configuration.

6a to 6b are conceptual views according to another embodiment of the present invention, the edges of which the boundary between the ball seating groove 31 and the separation preventing groove 32 are first and second rounded portions 33, depending on the direction of rotation; 34) to be curved;

The tab mounting axis of the tab collet is characterized in that the ball 4 is formed to be rounded with a larger radius of curvature, which is formed in the direction in which the ball is seated in the ball seating groove 31 than the direction in which it is detached from the ball seating groove 31. It was.

Normally, as shown in the figure, the ball 4 maintains a state in which a part of the ball seating groove 31 is inserted in the ball avoiding groove 51, but when the resistance to rotation exceeds a certain level during the rotational movement. Break away from the ball seating groove 31 is idling along the separation prevention groove (32).

At this time, if the edges that are the boundary between the ball seating groove 31 and the separation prevention groove 32 are sharp, there is a problem that a part of the ball 4 is stamped and damaged or in particular the separation is not constant, so this part is curved. Round treatment is preferred.

In addition, when the ball 4 is detached from the rounded part, the rounded part in which the ball 4 is inserted is relatively small when the ball is inserted into a larger curve to facilitate the separation.

1: Chuck
11: hanging groove
2: tap
3: tab mounting shaft
31: ball seating groove 32: separation prevention groove
33: first round part 34: second round part
4: Ball
5: housing
51: ball escape groove 52: thread
53: jamming
6: pressure ring
61: slope 62: torque increasing groove
7: coupling ring
71: thread
8 elastic means
81: leaf spring

Claims (2)

delete It is formed in the shape of a cylinder is formed in the middle of the separation prevention groove 32 is reduced in its outer diameter, the separation prevention groove 32 is formed with several recessed ball seating grooves 31 at a predetermined interval, A tab mounting shaft 3 configured to insert a part of the spherical ball 4 into the ball seating groove 31; The inner diameter of the upper portion is formed in a cylindrical shape so that the tab mounting shaft 3 is inserted and rotated corresponding to the outer diameter of the tab mounting shaft 3 and is adjacent to the ball seating groove 31 of the tab mounting shaft 3 coupled thereto. A plurality of shapes extending to the upper end and having a shape recessed at least larger than the diameter of the ball 4 at the inner diameter surface in the normal direction at the center of rotation so that the ball 4 inserted into the ball seating groove 31 can be inserted. A ball avoiding groove 51 is formed, and the inner diameter extends from the upper portion of the center of the ball 4 inserted into the ball avoiding groove 51 to the lower side and extends downward, and the thread 52 is formed on the inner peripheral surface of the end thereof. A housing 5; The inner diameter corresponds to the outer diameter of the tab mounting shaft (3), the outer diameter is inserted corresponding to the lower inner diameter of the housing (5), the upper surface is a pressing ring formed with an inclined surface 61 is inclined from the center toward the outer angle ( 6); An inner diameter corresponds to an outer diameter of the tab mounting shaft (3), and an outer diameter of a coupling ring (7) for forming and engaging a thread (71) corresponding to the lower thread (52) of the housing (5); In the tab mounting shaft of the tab collet composed of elastic means (8) mounted between the pressing ring (6) and the coupling ring (7);
The departure preventing groove 32 is formed to be in contact with the ball (4) along the curved surface consisting of a groove having the same radius of curvature as the ball (4);
The edge that is the boundary between the ball seating groove 31 and the departure prevention groove 32 is treated as a curve by the first and second round parts 33 and 34 according to the rotation direction, the ball (4) ball seating groove The place formed in the direction seated in the ball seating groove 31 is configured to be rounded with a larger radius of curvature than the direction in which it is detached from 31;
The upper inclined surface 61 of the pressing ring 6 is further formed with a torque increasing groove 62 extending in the normal direction with the same radius of curvature as the ball 4 on a vertical extension line of the ball avoiding groove 51. Tab mounting shaft of the tab collet, characterized in that.

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