JP3239277U - Axial telescopic holder for chamfering tools with adjustable preload - Google Patents

Abstract

A preload-adjustable axially extensible chamfering tool capable of adjusting the preload of an elastic member by easily exchanging a bushing according to the hardness of a chamfered workpiece to change the elastic characteristics. provide a holder for A preload-adjustable axially telescopic chamfering tool holder comprising an outer holder (10), a retaining member (20) attached to the outer holder, and a retaining member (20) movable relative to the outer holder within a predetermined range of movement. An inner holder 30 inserted into the holder, a bush 50 located in the outer holder and detachably installed between the holding member and the inner holder, one end abutting the bush and the other end the inner holder Alternatively, it includes an elastic member 60 that abuts against the holding member, and the elastic member is compressed and deformed by pressure from the bush to be preloaded. [Selection drawing] Fig. 2

Description

The present invention relates to a chamfering tool holder, and more particularly to a preload adjustable axially telescoping chamfering tool holder.

A chamfering tool holder is attached to the spindle of a machine tool and used as a tool holder for chamfering a workpiece. In order to avoid damage due to unexpected external force due to unevenness, related companies have developed an axially extendable chamfering tool holder. According to such a tool holder, by installing an elastic member such as a compression spring inside, an unexpected external force applied to the chamfering tool can be mitigated and the chamfering tool can be protected from damage due to the external force.

The impact force that the chamfering tool receives depends on the hardness of the workpiece to be chamfered. When processed, it receives a relatively large impact force. Therefore, when the chamfering tool is attached to the same axially extendable chamfering tool holder and chamfering is performed on works having different hardnesses, the impact force when chamfering a hard work is relatively large. The amount of expansion and contraction deformation of the internal elastic member also increases relatively, and in this case, the relative movement distance between the constituent members inside the tool holder also increases, so there is a problem that each member collides and wears out. there were. Therefore, when chamfering workpieces with different hardness, prepare multiple extendable tool holders with different buffering capacity according to the hardness of the workpiece, or disassemble the holder and use elastic members with different elastic moduli. I had to exchange it.

In this way, if a plurality of holders are prepared or troublesome elastic member replacement work is performed in order to deal with workpieces having different hardnesses, the cost increases and troublesome work increases.

The present invention has been made in view of the drawbacks of the above-mentioned prior art, and according to the hardness of the chamfered workpiece, the bushing can be easily replaced to adjust the preload of the elastic member to change the elastic characteristics. It is an object of the present invention to provide a preload-adjustable, axially telescoping chamfering tool holder that can be

To achieve the above object, the present invention provides a preload-adjustable axially telescopic chamfering tool holder comprising an outer holder, a retaining member attached to the outer holder, and a predetermined an inner holder that is inserted into the outer holder movably within a movement range; a bush that is positioned in the outer holder and is detachably installed between the holding member and the inner holder; An elastic member abuts on the bushing and the other end abuts on the inner holder or the holding member, and the elastic member is compressed and deformed by being pressed by the bushing to be preloaded. do.

The preload-adjustable axially telescopic chamfering tool holder has a plurality of the bushings replaceably mounted within the outer holder and between the retaining member and the inner holder. At least one of a plurality of bushes is attached.

The plurality of bushings have different lengths.

The outer holder has opposite ends, each of which has an opening communicating with the inside of the outer holder, and the holding member is detachably attached to the opening at one end of the outer holder. The holding member is attached to the opening at one end of the outer holder to close the opening, one end of the elastic member urges the bushing against the holding member, and the other end of the elastic member It abuts on the inner holder.

The holding member is composed of a head and a body that are connected to each other, and a male thread is formed on the outer periphery of the head. A ridge is formed, and the bush is attached to the trunk portion of the holding member and is pressed against the head portion of the holding member by the biasing force of the elastic member.

The elastic member is a compression spring.

A recess is provided in one end of the inner holder, the bush has an annular recess, and both ends of the elastic member abut the bottom of the recess and the bottom of the annular recess, respectively.

The preload adjustable axially extendable chamfering tool holder includes at least one ball and a sleeve member, the outer holder includes at least one ball receiving hole, and the inner holder includes at least one regulating groove. wherein the at least one ball is positioned in the at least one ball receiving hole and received in the at least one regulation groove, and the sleeve member shields the at least one ball receiving hole; It is characterized by being attached to the outer holder.

According to the technical characteristics described above, the preload-adjustable axially extensible chamfering tool holder according to the present invention has a replaceable bushing that applies a preload to the elastic member, thereby facilitating the elastic characteristics of the elastic member. When chamfering workpieces with different hardness, depending on the hardness of the workpiece, by giving an appropriate preload to the elastic member through a simple bush exchange work, the elastic member can be adjusted to the appropriate It is possible to generate an elastic deformation amount, and as a result, when chamfering workpieces with different hardness, chamfering can be performed with the same holder without preparing multiple extendable holders with different cushioning capacity. Therefore, it is possible to save costs and improve work efficiency.

1 is a perspective view of a preferred embodiment of the present invention; FIG. 1 is a partial cutaway exploded view of a preferred embodiment of the present invention; FIG. 1 is a side sectional view showing part of the interior of a preferred embodiment of the present invention; FIG. 4 is a partially enlarged cross-sectional view of FIG. 3; FIG. FIG. 4 is a partially enlarged cross-sectional view showing a state in which an impact force is received from a work in a preferred embodiment of the present invention; FIG. 4 is a partially enlarged cross-sectional view showing how workpieces of different lengths are mounted in the preferred embodiment of the present invention; FIG. 4 is a partially enlarged cross-sectional view showing another state in which works of different lengths are mounted in the preferred embodiment of the present invention;

In order that the technical features and practical effects of the present invention can be deeply understood and implemented according to the content of the invention, the preferred embodiments illustrated in the drawings are described in detail as follows.

1 and 2 show a preferred embodiment of the preload-adjustable axially telescopic chamfering tool holder of the present invention, according to which the tool holder comprises an outer holder 10, a retaining member 20, including inner holder 30, ball 40, bush 50 and elastic member 60;

As shown in FIGS. 2-4, the outer holder 10 has a first end 101 and a second end 102 at opposite ends thereof, and the first end 101 and the second end 102 are The first end 101 and the second end 102 each have an opening 12 communicating with the interior of the outer holder 10, the ball receiving hole 11 being positioned between the outer It is formed through the peripheral wall 100 of the holder 10 in the radial direction. The holding member 20 is composed of a head portion 21 and a body portion 22 which are integrally connected, the outer diameter of the head portion 21 being larger than the outer diameter of the body portion 22, and the outer circumference of the head portion 21 being A male thread 211 is formed and a corresponding female thread 103 is formed on the first end 101 of the outer holder 10 so that the retaining member 20 can be attached to the first end 101 of the outer holder 10 . It is detachably screwed to the first end 101 of the outer holder 10 so as to close the opening 12 .

As shown in FIGS. 2 to 4, the inner holder 30 is axially movably inserted inside the outer holder 10 so as to be inserted from the second end 102 of the outer holder 10. A long restricting groove 31 extending in the axial direction is provided on the outer peripheral wall surface of the holder 30 , and the restricting groove 31 communicates with the ball receiving hole 11 . Members such as a collet and a tightening nut for attaching a chamfering tool are installed at one end of the inner holder 30 that is exposed to the outside of the outer holder 10. The technology related to this configuration is known technology. Therefore, the description is omitted here.

As shown in FIGS. 2 and 3 , the ball 40 is accommodated in the ball receiving hole 11 so as to be movable along the regulation groove 31 . The axial movement distance for 10 is limited to the length of the regulation groove 31 . Although the preferred embodiment of the present invention shown in the drawings has only one ball 40, one ball receiving hole 11 and one regulating groove 31, it is not limited to this. A plurality of holes 11 and regulation grooves 31 may be provided. Further, as shown in FIGS. 1 to 3, the preload-adjustable axially extendable chamfering tool holder of the present invention is mounted around the outer periphery of the outer holder 10 so as to shield the ball receiving hole 11. By installing the sleeve member 70 , the ball 40 is prevented from falling out of the ball receiving hole 11 .

In the preferred embodiment of the present invention, the combination of the ball 40, the ball receiving hole 11, and the regulation groove 31 allows the movement distance of the inner holder 30 relative to the outer holder 10 in the axial direction to be equal to the length of the regulation groove 31. However, the method of controlling the axial movement distance of the inner holder 30 with respect to the outer holder 10 is not limited to this. Alternatively, a control method for existing axially extendable chamfering tool holders may be used.

As shown in FIGS. 2 to 4, the bush 50 is housed in the outer holder 10 on the side of the first end portion 101 and is mounted on the trunk portion 22 of the holding member 20. Therefore, the user can easily take out the bush 50 from the outer holder 10 and replace it by removing the holding member 20 screwed to the first end 101 of the outer holder 10 . As shown in FIGS. 3 and 4, the elastic member 60 is a compression spring disposed within the outer holder 10, one end of which pushes the bush 50 against the head 21 of the holding member 20. , the other end abuts the inner holder 30, and the top of the restricting groove 31 of the inner holder 30 abuts the ball 40 downward due to the biasing force of the elastic member 60. . As shown in FIG. 4, in the preferred embodiment of the present invention, a recess 32 is recessed in the top of the inner holder 30, an annular recess 51 is formed in the end of the bush 50, and the recess 32 and the annular recess 51 are arranged to face each other, and both ends of the elastic member 60 are respectively installed to contact the bottom of the depression 32 and the bottom of the annular recess 51, that is, both ends of the elastic member 60 are accommodated and held in the depressed portion 32 and the annular recessed portion 51, respectively, thereby preventing displacement when the elastic member 60 is elastically deformed.

The preload-adjustable axially telescopic chamfering tool holder of the present invention can be applied to the chamfering of workpieces with different hardness. Three usage examples will be described below. Usage example 1: When chamfering a metal material with low hardness, such as an aluminum-based or copper-based metal material, as shown in FIGS. 50 is installed. The length L1 of the bush 50 used in this example of use is 5 millimeters. Since the preload applied to the elastic member 60 is relatively small by installing the small-sized bushing 50 in this way, the reaction force of the elastic member 60 is also relatively weak. When chamfering, as shown in FIG. 5, when the chamfering tool receives an impact force due to the unevenness of the surface of the workpiece, the inner holder 30 shrinks into the outer holder 10 and the top of the regulation groove 31 separates from the ball 40. and the weakly preloaded elastic member 60 compresses to absorb the impact force.

Usage Example 2: When chamfering a metal material with standard hardness, as shown in FIG. Bushing 50A is replaced with a bushing 50A having a longer L2 than the length L1 of 50. Incidentally, the length L2 of the bush 50A used in this second usage example is 10 millimeters. According to this configuration, the length L2 of the replaced bushing 50A is longer than the length L1 of the bushing 50, so the preload applied to the elastic member 60 is relatively large compared to the first example of use. The reaction force of the elastic member 60 is stronger than in example 1 of use. Therefore, when a hard workpiece is chamfered, the impact force received by the chamfering tool also increases, and the elastic member 60 adjusted to have a strong reaction force can absorb the strong impact force with a short amount of elastic deformation. Therefore, the distance by which the inner holder 30, which receives a strong impact force, shrinks into the outer holder 10 is shortened, so that the degree of wear due to collision between members can be minimized.

Usage Example 3: When chamfering a metal material with high hardness, as shown in FIG. 7, similarly, the holding member 20 is removed and replaced with a bushing 50B having a length L3 longer than the length L2 of the bushing 50A. do. Incidentally, the length L3 of the bush 50B used in this third usage example is 15 millimeters. According to this configuration, the length L3 of the replaced bushing 50B is longer than the length L2 of the bushing 50A, so the preload applied to the elastic member 60 is even greater than in example 2. , the reaction force of the elastic member 60 is stronger than that of the usage example 2. Therefore, when chamfering a hard work, the impact force that the chamfering tool receives is considerably large, and by adjusting the reaction force of the elastic member 60 at this time to be strong to some extent, the strong impact force can be absorbed with a short amount of elastic deformation. Therefore, the moving distance of the inner holder 30 with respect to the outer holder 10, which has received a strong impact force, can be kept short.

The preload-adjustable axially extendable chamfering tool holder of the preferred embodiment of the present invention can be easily replaced with different length bushings 50, 50A, 50B when chamfering workpieces with different hardness. By adjusting the preload applied to the elastic member 60 and changing the elastic characteristics of the elastic member 60, the elastic member 60 can absorb different impact forces with an appropriate amount of elastic deformation. , the moving distance of the inner holder 30 with respect to the outer holder 10 can be kept short. According to the present invention, when chamfering workpieces with different hardnesses, bushings 50, 50A, and 50B with different lengths are attached to the same holder without preparing a plurality of extendable holders with different buffering capacities. Since it can be dealt with simply by replacing it with another, it is possible to save costs and improve work efficiency.

In the preferred embodiment of the present invention described above, three examples of use were described with bushings 50, 50A, 50B having lengths of 5, 10, and 15 millimeters. , the holding member 20 and the inner holder 30, the material of the elastic member 60, and the hardness of the workpiece to be chamfered. In addition, the number of bushes 50 attached is not limited to one, and a plurality of bushes 50 having different lengths may be attached, or the same number of bushes 50 may be attached as long as the elastic member 60 can be given the necessary preload. A plurality of length bushings 50 may be installed.

A holding member 20 is detachably coupled to the first and second ends 101 and 102 of the outer holder 10 of the preferred embodiment of the present invention, and has an opening 12 for inserting the inner holder 30 . According to this design, the holding member 20 can be easily attached and detached from the first end 101 of the outer holder 10, and the replacement of the bushing 50 can be performed simply and quickly. However, the configuration of the present invention is not limited to this preferred embodiment, the outer holder 10 has an opening at only one end, and the retaining member 20, the bushing 50, the elastic member 60 and the inner holder 30 are The outer holder 10 may be configured to be sequentially mounted into the outer holder 10 from the only opening of the outer holder 10, or the holding member 20 may be integrally molded inside the outer holder 10, in any event. As long as one end of the elastic member 60 presses the bush 50 against the holding member 20 and the other end abuts against the inner holder 30, any configuration may be used.

In addition, the elastic member 60 of the preferred embodiment of the present invention is mounted inside the outer holder 10 so that one end thereof contacts the inner holder 30 and the other end presses the bushing 50 against the holding member 20. The elastic member 60 is not limited to this, as long as the elastic member 60 is compressed and deformed by the pressure of the bush 50 arranged between the inner holder 30 and the holding member 20 and preloaded. The bushing 50 may be mounted in the outer holder 10 so that one end abuts the holding member 20 and the other end presses the bushing 50 against the inner holder 30 .

The above description is merely a preferred embodiment of the invention, and does not limit the invention in any way. Although the present invention has been disclosed with a relatively preferred embodiment as described above, this is not intended to limit the present invention, and any person skilled in the art can understand the technology of the present invention without departing from the technical concept of the present invention. Any simple modifications, changes and modifications made to the above embodiments based on the essence of are all still within the scope of the technical concept of the present invention.

10 Outer holder 100 Peripheral wall 101 First end 102 Second end 103 Female thread 11 Ball receiving hole 12 Opening 20 Holding member 21 Head 211 Male thread 22 Body 30 Inner holder 31 Regulating groove 32 Depression 40 Ball 50, 50A, 50B Bushing 51 Annular recess 60 Elastic member 70 Sleeve member L1, L2, L3 Length

Claims (8)

A preload adjustable axially telescopic chamfering tool holder comprising:
an outer holder;
a holding member attached to the outer holder;
an inner holder inserted into the outer holder so as to be movable within a predetermined movement range with respect to the outer holder;
a bush positioned within the outer holder and detachably installed between the holding member and the inner holder;
an elastic member having one end in contact with the bush and the other end in contact with the inner holder or the holding member;
A chamfering tool holder capable of axial expansion and contraction with preload adjustment, wherein the elastic member is preloaded by being compressed and deformed by pressure from the bush. The preload-adjustable axially telescopic chamfering tool holder has a plurality of the bushings replaceably mounted within the outer holder and between the retaining member and the inner holder. 2. A preload adjustable axially telescoping chamfering tool holder according to claim 1, wherein at least one of a plurality of bushings is mounted. 3. The preload adjustable axially telescoping chamfering tool holder of claim 2, wherein said plurality of bushings have different lengths. The outer holder has opposite ends, and each of the opposite ends has an opening communicating with the inside of the outer holder,
The holding member is detachably attached to an opening at one end of the outer holder, and the opening is closed by attaching the holding member to the opening at one end of the outer holder,
4. The elastic member according to any one of claims 1 to 3, wherein one end of said elastic member biases said bushing against said holding member, and the other end abuts against said inner holder. Axially extendable holder for chamfering tools with adjustable preload. The retaining member has a head and a body that are connected, and has a male thread formed on the outer periphery of the head and a corresponding female thread on the outer holder where it joins with the retaining member. is formed and
5. The axial preload adjustable type according to claim 4, wherein the bushing is mounted around the trunk portion of the holding member and pressed against the head portion of the holding member by an urging force from the elastic member. Extendable holder for chamfering tools. 6. A preload adjustable axially extendable chamfering tool holder according to claim 5, wherein said resilient member is a compression spring. A recess is provided in one end of the inner holder, the bushing has an annular recess, and both ends of the elastic member are in contact with the bottom of the recess and the bottom of the annular recess, respectively. Preload-adjustable axially telescopic chamfering tool holder according to any one of claims 1 to 3. The preload adjustable axially extendable chamfering tool holder includes at least one ball and a sleeve member, the outer holder includes at least one ball receiving hole, and the inner holder includes at least one regulating groove. including
the at least one ball positioned in the at least one ball receiving hole and received in the at least one regulation groove;
The adjustable preload shaft according to any one of claims 1 to 3, wherein the sleeve member is attached to the outer holder so as to shield the at least one ball receiving hole. Directionally extendable holder for chamfering tools.

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