TWI688449B - Automatically balanced tool holder - Google Patents

Abstract

An automatic balancing tool machine tool handle includes a body and at least one balancing piece set. The body includes an installation portion extending along an axis and adapted to be installed on a main shaft of a machine tool, a tool holder portion opposite to the installation portion along the axis and adapted to be provided with a tool, and a connection to the equipment The ring portion of the mounting portion and the tool holder portion and protrudes in the radial direction of the axis along the mounting portion. The balance piece group includes a ring groove formed in the ring portion and formed in an annular shape around the axis, and a plurality of masses disposed in the ring groove and freely movable in the ring groove, the total mass of the masses The volume does not exceed half of the volume of the ring groove, and when the masses are concentrated with each other in an arc shape, the arc angle does not exceed 180 degrees. When the overall rotation system rotates at a high speed, the masses move towards the opposite position of the unbalance amount in the ring groove, which can suppress the vibration caused by the unbalance amount, reduce the number of corrections of the spindle and the tool holder, and improve the machine tool Utilization rate.

Description

Automatically balanced tool holder

The invention relates to a machine tool handle, in particular to an automatic balancing machine tool handle.

The spindle and tool holder of the machine tool have high speed and high precision requirements. However, when the spindle and tool holder of the machine tool rotates around its axis, the asymmetry of the structure of the spindle or tool holder, the asymmetric distribution of the material quality or the error caused by the assembly of the mechanism... etc. Factors, which produce unbalance, and then produce vibration and noise during high-speed rotation, and affect the machining accuracy and the service life of the spindle and tool handle. The general solution is to measure and calibrate the unbalance of the machine tool spindle and tool holder before and after processing for a period of time. However, multiple shutdown corrections will increase the processing time and production costs.

Therefore, the object of the present invention is to provide a tool balance for an automatic balancing machine tool that reduces the number of corrections of the spindle and the tool holder and improves the machine tool utilization rate.

Therefore, the automatic balancing tool holder of the present invention includes a body and at least one balancing piece set. The body includes an installation portion extending along an axis and adapted to be installed on a main shaft of a machine tool, a tool holder portion opposite to the installation portion along the axis and adapted to be provided with a tool, and a connection to the equipment The ring portion of the mounting portion and the tool holder portion and protrudes in the radial direction of the axis along the mounting portion. The balance piece set includes a ring groove formed in the ring portion and formed in an annular shape around the axis, and a plurality of masses disposed in the ring groove and freely movable in the ring groove, the total mass of the masses The volume does not exceed half of the volume of the ring groove, and when the masses are concentrated in an arc shape, the arc angle does not exceed 180 degrees.

The effect of the present invention is that the masses of the balance piece set can move freely in the ring groove, and under the condition that the overall rotation system is at a high speed, the masses will move toward the unbalanced amount in the ring groove The opposite position of the movement can suppress the vibration caused by the unbalanced amount, thereby reducing the number of corrections of the main shaft of the machine tool and the tool holder, and improving the working rate of the machine tool. The ring groove of the balance member group is formed in the The body makes the overall structure simpler and more rigid.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same numbers.

1 and 2, a first embodiment of an automatic balancing tool holder of the present invention is suitable for installing a tool 2 on a main shaft 1 of a machine tool, the main shaft 1 can be driven to rotate about an axis L , The handle includes a body 3, and two balance piece groups 4. In this embodiment, the tool holder is a BT type tool holder, but not limited to this.

Referring to FIGS. 2 to 4, the body 3 includes an installation portion 31 extending along the axis L and adapted to be installed on the main shaft 1, and an opposite to the installation portion 31 along the axis L and adapted to be used for the tool 2. The knife seat portion 32 provided, and a ring portion 33 which connects the mounting portion 31 and the knife seat portion 32 and protrudes from the mounting portion 31 in the radial direction of the axis L. The ring portion 33 has an upper end surface 331 connected to the mounting portion 31, a lower end surface 332 opposite to the upper end surface 331 and connected to the tool holder portion 32, and an outer edge connected to the upper end surface 331 and the lower end surface 332 The outer peripheral surface 333 between the outer edges. In other embodiments, the inside of the body 3 can be equipped with parts such as collet, pull nail, etc. according to the tool clamping method, tool holder setting method and tool holder function, and the body 3 can also be provided with cutting fluid flow Dao... etc., not limited to the illustration.

The balance piece group 4 includes a ring groove 41 formed in the ring portion 33 and having an annular shape around the axis L, a plurality of masses 42 disposed in the ring groove 41 and freely movable in the ring groove 41, And a cover 43.

The ring groove 41 is opened on the lower end surface 332 of the body 3 and has an opening 411 on the lower end surface 332. The axis L is defined to extend along an axis D1. The ring groove 41 is formed by a groove bottom surface 34 of the body 3, a first groove side surface 35, and a second groove side surface 36. The groove bottom surface 34 is along the axial direction D1 is spaced from the lower end surface 332, and the groove bottom surface 34 has an inner edge 341 close to the axis L, and an outer edge 342 away from the axis L, the first groove side surface 35 connects the inner edge 341 and the lower end surface 332 The side 36 of the second groove is connected to the outer edge 342.

The cover plate 43 covers the opening 411 along the axial direction D1. The cover plate 43 has a flat plate-shaped abutment portion 431 abutting against the lower end surface 331, and a abutment portion 431 along the axis The extension portion 432 extends into the ring groove 41 in the direction D1, and the extension portion 432 is spaced from the groove bottom surface 34 along the axial direction D1. The groove bottom surface 34 of the body 3, the first groove side surface 35, the second groove side surface 36 and the extension 432 collectively define the volume of the ring groove 41. During manufacture, the cover plate 43 can be fixed to the lower end surface 332 by locking or welding after the masses 42 are placed in the ring groove 41 to seal the opening 411.

The masses 42 are limited by the cover plate 43 and are located in the ring groove 41, and the total volume of the masses 42 does not exceed half of the volume of the ring groove 41, and when the masses 42 are concentrated When the arc is round, its arc angle q does not exceed 180 degrees (see Figure 4).

In this embodiment, the masses 42 are balls and the number is an even number, and the masses 42 are mixed with lubricating oil to reduce the masses 42 moving in the corresponding ring groove 41 The friction force generated between the bottom surface 34 and the second groove side surface 36, and in other embodiments, the masses 42 may be liquid, solid or a mixture of liquid and solid.

When the main shaft 1 of the machine tool rotates and the rotation speed is higher than the natural frequency, the masses 42 of each balance piece group 4 will move in the opposite direction of the unbalanced amount, so that the center of mass of the overall rotating system is infinitely close to the axis L, In this way, the vibration caused by the unbalanced amount can be suppressed, thereby reducing the number of corrections of the main shaft 1 and the tool holder 2 of the machine tool, and improving the machine tool utilization rate.

In addition, in other implementations, the number of the balance member groups 4 may be only one or more than one according to the position and degree of unbalance. In addition, the ring groove 41 of the balance member group 4 can also be opened in one of the upper end surface 331 and the lower end surface 332 of the body 3, so that not only the overall structure is simplified and the rigidity is better, but also the second groove The side surface 36 is also a part of the body 3, rather than an external cover plate, so that the second groove side surface 36 is not easily deformed due to the centrifugal force of the masses, and can maintain the roundness of the ring groove 41, so that When the masses 42 are positioned by rolling, their positions will not shift.

In this embodiment, the ring groove 41 of the balance piece set 4 is opened on the lower end surface 332 of the body 3, in addition to maintaining the roundness of the ring groove 41, it is also convenient for cutting out the The ring groove 41 and the cover plate 43 can be locked or welded during assembly. In addition, because the ring groove 41 is located at the position where the unbalance amount is generated, a better balance effect can be achieved, so this embodiment uses the extension portion 432 of the cover plate 43 and the groove bottom surface 34 to cooperate, which can be easily controlled at the time of manufacturing The position of the ring groove 41 in the axial direction D1, so that the ring groove 41 can be easily controlled at the position where the unbalance amount is generated. Further explained, since the unbalance amount is easily generated near the lower end surface 332, the present In the embodiment, the ring groove 41 is disposed on the lower end surface 332 to achieve a better balance effect.

It is worth mentioning that the bottom surface 34 of the groove and the side surface 36 of the second groove can be curved so that the masses 42 are guided to float toward the cover 43 when rolling in their respective ring grooves 41 , In order to reduce the area of contact with the bottom surface 34 of the groove and the side surface 36 of the second groove, reduce the impact of friction on the masses 42, so that the masses 42 can be better positioned in the reverse position of the unbalanced amount, However, the shapes of the bottom surface 34 of the groove and the side surface 36 of the second groove may be other shapes that are beneficial to reduce the contact area, and are not limited thereto.

In addition, since the masses 42 of each balance piece group 4 can be stably moved and positioned at the opposite position of the unbalance amount under the condition of high-speed unidirectional rotation, the machine tool to which this embodiment applies is The machine tool with grinding function does not produce rapid forward and reverse rotation during the grinding process, so that the balance piece group 4 can indeed achieve a balancing effect, but in other implementation forms, the type of machine tool applicable is not limited to this .

Referring to FIG. 5, one of the second embodiments of the tool balance of the automatic balancing machine tool of the present invention is similar to the foregoing first embodiment, and the only difference is that the tool handle is an HSK type tool handle.

In summary, the tool balance of the automatic balancing machine tool of the present invention can move freely in the ring groove 41 by the masses 42, and the masses 42 will be uneven when the overall rotation system is at a high speed The opposite position of the measurement moves to suppress the vibration caused by the unbalanced amount, thereby reducing the number of corrections of the main shaft 1 and the handle 2 of the machine tool, and improving the machine tool utilization rate, and formed in the body 3 by the ring groove 41 , Making the overall structure simpler and better rigidity, so it can indeed achieve the purpose of cost invention.

However, the above are only examples of the present invention, and should not be used to limit the scope of the present invention. Any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still classified as This invention covers the patent.

1: spindle

2: cutter

3: Ontology

31: Installation Department

32: knife seat

33: Ring

331: upper end face

332: Lower end face

333: outer peripheral surface

34: groove bottom

341: Inner edge

342: outer edge

35: Side of the first slot

36: Side of the second slot

4: balance piece group

41: Ring groove

411: opening

42: Mass

43: Cover

431: abutment

432: Extension

L: axis

D1: axial

q: arc angle

Other features and functions of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: FIG. 1 is an assembly schematic diagram of a first embodiment of an automatic balancing tool holder of the present invention for fixing a tool to a main shaft of a machine tool; Figure 2 is a front view of the embodiment; FIG. 3 is an incomplete schematic cross-sectional view of the embodiment FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG. 3, illustrating the state when a plurality of masses of a balance piece group are concentrated with each other in a ring groove; and Fig. 5 is a partially cut-away front view of a second embodiment of a tool balance of an automatic balancing machine tool of the present invention.

2: cutter

31: Installation Department

32: knife seat

33: Ring

331: upper end face

332: Lower end face

34: groove bottom

341: Inner edge

35: Side of the first slot

36: Side of the second slot

4: balance piece group

41: Ring groove

411: opening

42: Mass

43: Cover

431: abutment

342: outer edge

432: Extension

Claims (2)

An automatic balancing machine tool handle includes: a body including an installation portion extending along an axis and suitable for being installed on a main shaft of a machine tool, and an installation portion along the axis opposite to the installation portion and suitable for supplying A knife seat part provided with a cutter, and a ring part connecting the installation part and the knife seat part and protruding the installation part in the radial direction of the axis, the ring part having an upper end surface connecting the installation part, A lower end surface opposite to the upper end surface and connected to the knife seat portion, and an outer peripheral surface connected between the outer edge of the upper end surface and the outer edge of the lower end surface; and at least one balance member group, including a ring formed in the ring Part and a ring-shaped groove around the axis, and a plurality of masses disposed in the ring-shaped groove and freely movable in the ring-shaped groove, the total volume of these masses does not exceed half of the volume of the ring-shaped groove , And when the masses are concentrated in an arc shape, the arc angle does not exceed 180 degrees, the ring groove is opened on the lower end surface, and has an opening on the lower end surface, defining the axis along an axis Extending horizontally, the balance piece set further includes a cover plate covering the opening along the axial direction, the masses are restricted by the cover plate and located in the ring groove, the cover plate has a flat plate shape and abuts An abutting portion on the lower end surface, and an extending portion extending from the abutting portion into the annular groove in the axial direction, the annular groove is composed of a groove bottom surface, a first groove side surface, and a second groove side surface The bottom surface of the groove is spaced from the extension and has an inner edge close to the axis and an outer edge away from the axis, the first groove side connects to the inner edge, and the second groove side connects to the outer edge The bottom surface of the groove, the side surface of the first groove, the side surface of the second groove, and the extension define the volume of the ring groove. The self-balancing machine tool handle according to claim 1, wherein the masses are balls and are an even number.

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