JPH0469144A - Tool holding structure of ultrasonic machine - Google Patents

Abstract

PURPOSE:To certainly secure a cutting tool to a cutting horn tool by holding the sleeve, which is assembled around the cutting tool in the driving process of a socket nut to a tool securing section by means of the first regulation face of the hole, in which the sleeve is contained, and the second regulation face of the socket nut. CONSTITUTION:A sleeve 32 is held by means of the first regulation face 34 of a tool securing section 22 and the second regulation face of a socket nut 38 by driving the socket nut 38 into the tool securing section 22 and the diameter of the sleeve 32 is made to shrink and pressedly connected to a cutting tool 20, around which a sleeve 32 is assembled, with the cutting tool 20 set to the tool securing section 22 of an ultrasonic machine tool. The cutting tool 20 can certainly be fixed to the cutting horn tool securing section 22 by simple work such as only driving a socket into the tool securing section 22.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a tool holding structure for an ultrasonic processing machine, and more specifically, the present invention relates to a tool holding structure for an ultrasonic processing machine. The present invention relates to a tool holding structure that can be reliably and easily attached to a tool mounting portion provided in the tool holding structure.

Conventional technology As a type of machine tool that performs processing such as cutting, grinding, and shearing on a workpiece, by applying ultrasonic vibration to a rotating processing tool, the resistance applied to the tip of the tool during processing is reduced. Ultrasonic processing machines that can improve processing accuracy are known. This ultrasonic machining machine is equipped with a machining horn that amplifies mechanical vibrations generated by an ultrasonic vibrator rotatably disposed on the spindle head, and applies the required vibration to a machining tool attached to the machining horn. It is configured to grant.

In the ultrasonic machining machine, if the machining tool is not securely fixed to the machining horn, serious problems such as the machining tool being displaced or damaged due to the load applied during machining will occur. . Furthermore, the ultrasonic vibrations are not efficiently transmitted to the machining tool, resulting in energy loss, which causes a decrease in machining accuracy and machining efficiency. Therefore, various proposals have been made to securely fix a machining tool to a machining horn.

For example, a structure in which a machining horn and a machining tool are integrally formed in advance, or a structure in which a threaded portion is provided on the machining tool and the tool and the machining horn are screwed together is generally known.

Additionally, a means for integrally fixing the machining tool to the machining horn using adhesive means such as silver solder or solder is also adopted. Furthermore, by forming a slot in the tool mounting portion of the machining horn and reducing the diameter of the mounting portion in the radial direction via a bolt while the processing tool is inserted through the mounting portion.

Methods have also been proposed in which the horn and the tool are fixed by pressure contact, or the processing tool is fixed with a set screw inserted into the processing horn.

Problems to be Solved by the Invention The above-mentioned processing tools used in ultrasonic processing machines are subject to wear and tear over time, and therefore require frequent replacement in order to achieve proper ultrasonic processing. It is a quality item. However, as mentioned above, in the case where the machining horn and the machining tool are integrally formed, or where the machining tool requires processing to form a threaded portion, there is a drawback that the associated cost becomes extremely high. . In addition, when processing tools are fixed using adhesive means such as silver soldering or soldering, complicated removal and adhesion must be performed every time the tool is replaced.
The disadvantage is that it requires a lot of time and effort.

In addition, the ultrasonic machining machine is configured to apply vertical vibration to the machining tool, so the bolts and set screws are used to generate vibrations from the horizontal direction (radial direction of the machining tool). The fixing method has the disadvantage that it tends to loosen due to vibrations generated during processing. Moreover, in this case, as mentioned above, vibrations cannot be transmitted efficiently, resulting in large energy losses, and there are also problems such as generation of heat at the contact area between the machining horn and the machining tool, and damage to the tool. Ta.

OBJECTS OF THE INVENTION The present invention has been made in view of the drawbacks inherent in the holding structure of a machining tool in an ultrasonic machining machine.

To provide a means for easily and reliably attaching a commercially available machining tool that has not undergone any special processing to the machining horn of an ultrasonic machining machine, which has been proposed to suitably solve this problem. With the goal.

Means for Solving the Problems In order to overcome the above-mentioned problems and achieve the desired objectives, the present invention provides a hollow spindle which is rotatably supported by the spindle head and rotated by a suitable drive means. and a machining horn having one end connected to the ultrasonic generation means and a tool mounting portion provided at the other end, and detachably attached to the tool mounting portion of the processing horn. In an ultrasonic processing machine that performs a required processing on a workpiece by applying rotation and ultrasonic vibration to a processing tool.

A sleeve having a through hole formed in the axial direction through which the processing tool can be inserted.

A hole is formed in the open end of the tool mounting portion in the axial direction.

A sleeve receiving hole that accommodates the sleeve into which the processing tool has been inserted from one end side, and has a first regulating surface that contacts the one end side of the sleeve in the inner part.

It can be screwed into the tool mounting part from the outside.

A socket nut having a through hole through which the processing tool is inserted, and a second regulating surface that is capable of coming into contact with the other end of the sleeve on an inner side opposite to the first regulating surface of the sleeve accommodation hole; , at least one of the first and second regulating surfaces is formed as a tapered surface, and in the process of screwing the socket nut into the tool mounting part, the sleeve fitted onto the processing tool is inserted into the sleeve. It is characterized in that it is configured to be compressed by the first regulating surface of the accommodation hole and the second regulating surface of the socket nut, thereby reducing the diameter of the sleeve inward in the radial direction and press-contacting it to the processing tool.

According to the present invention, when the processing tool with the sleeve inserted therein is set in the tool mounting section of the ultrasonic processing machine, by screwing the socket nut into the mounting section, the sleeve is attached to the first regulating surface of the tool mounting section. and the second regulating surface of the socket nut to reduce the diameter of the sleeve and bring it into pressure contact with the processing tool. In other words, the machining tool can be reliably fixed to the tool mounting part by simply screwing the socket nut into the tool mounting part. Further, machining tools can be replaced easily and in a short time.

Embodiments Next, a preferred embodiment of the tool holding structure for an ultrasonic processing machine according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a schematic configuration of a main spindle 12 in an ultrasonic processing machine 10, in which a hollow main shaft 14 is rotatably supported by a main spindle head and rotated by an appropriate drive means (none of which is shown). An ultrasonic transducer 16 is disposed inside the ultrasonic transducer 16, and the ultrasonic transducer 16 converts high-frequency electrical energy output from a high-frequency oscillator (not shown) disposed outside into mechanical vibration energy. It functions to convert to .

Also.

The other end of a machining horn 18 whose one end protrudes from the shaft end of the hollow main shaft 14 is connected to the ultrasonic vibrator 16, and the ultrasonic vibrator 16 and the machining horn 18 are connected to a flange formed on the horn 18. It is arranged and fixed to the hollow main shaft 14 via 18a. Note that the vibration generated by the ultrasonic vibrator 16 is
The vibration is amplified by the machining horn 18, and is configured to generate vibrations suitable for machining at the tip of a machining tool 20, which will be described later.

A fitting recess 18b extending in the axial direction is bored at the open end of the processing horn 18, and the fitting recess 18b
A female threaded hole 18c is formed along the axial direction at the bottom of the tool holder 22, and the tool holder 22 is removably attached through this female threaded hole 18c. That is, as shown in FIG. 1, the tool holder 22 has a first male threaded portion 26 formed at one end in the axial direction of the main body 24, and a flange 24a at a position set back from the first male threaded portion 26 by a predetermined length. It is formed. Then, the first male threaded portion 26 is inserted into the female threaded hole 1 of the machining horn 18 until the flange 24a contacts the open end of the holder.
By screwing into 8c.

The tool holder 22 is firmly attached to the machining water tube 18. Note that by fitting the main body 24 extending in the axial direction from the flange 24a of the tool holder 22 into the fitting recess 18b, the machining horn 18 and the tool holder 22 are set to match each other in detail. .

A machining tool 20 is removably disposed at the other end of the tool holder 22.

As shown in FIG. 3, this processing tool 20 is composed of a shank 20a of a predetermined length and a bit 20b formed at one end of the shank 20a, and is generally widely available on the market. are preferably used. As shown in FIG. 3, a sleeve 32 of a predetermined length is fitted onto the shank 20a through a through hole 32a. At both ends of this sleeve 32, fitting portions 36.36 are formed that protrude inward in the radial direction, and the through holes 36b in the fitting portions 36 are connected to the shank before the processing tool 20 is fixed. The dimensions are set such that 20a can be easily inserted therethrough. Note that the sleeve 32 used has the optimum size according to the specifications of the processing tool 20.

Further, a tapered surface 36a is formed on the axially outer end surface of the fitting portion 36, as shown in FIG. 2, the tapered surface 36a is inclined in a direction that recedes from the end as it goes radially outward from the one-through hole 36b. The tapered surfaces 36a, 36a are configured to contact a first regulating surface 34 of the tool holder 22 and a second regulating surface 44 of the socket nut 38, which will be described later, in a corresponding manner.

Note that, as described later, a soft material that can be deformed by screwing the socket nut 38 is suitable for the sleeve 32 and the fitting part 36. However, when the fitting part 36 bites into the processing tool 20.

If there is a possibility that the required holding force may not be obtained.

It is recommended to selectively use materials that have undergone surface hardening treatment.

Here, the outer end surface of the fitting portion 36 does not necessarily need to be tapered, and may be formed parallel to the direction intersecting the axial direction of the sleeve 32. However, in this case, as will be described later, The first regulating surface 34 and the second regulating surface 4
4 must be tapered. Furthermore, forming the fitting portion 36 on the sleeve 32 means that
Although not an essential requirement of the present application, the objectives of the present application can also be achieved, for example, by using a sleeve 32 without a radially inwardly projecting portion. In this case, it is recommended that the inner diameter of the through hole 32a in the sleeve 32 be slightly longer than the outer diameter of the shank 20a in the processing tool 20.

As shown in FIGS. 2 and 3, a sleeve receiving hole 2 of a required diameter is provided at the tool mounting end of the tool holder 22.
8 is bored so as to extend in the axial direction, and at the bottom of the accommodation hole 28 is a first hole that comes into contact with a tapered surface 36a of a fitting part 36 provided at one end of a sleeve 32 fitted onto the processing tool 20.
A regulating surface 34 is formed. This first regulating surface 34 is
The first regulating surface 34 is tapered toward the end as it goes radially outward from the axis.
It functions to restrict the movement of the fitting part 36 in the axial direction and to deform the fitting part 36 inward in the radial direction.

Further, the first regulating surface 34 is in contact with one end of the sleeve 32, and the other end of the sleeve 32 is in contact with the sleeve receiving hole 28.
It is provided at a position extending a predetermined length from the base. Note that even if the first regulating surface 34 is not tapered, if it is formed in a shape that can regulate the movement of the sleeve 32 in the axial direction, it can deform the fitting portion 36 inward in the radial direction. It is something that can be done.

A center through hole 30 into which the shank 20a of the processing tool 20 can be inserted is bored in the bottom of the sleeve accommodation hole 28 along the axial direction. By inserting the shank 20a of the machining tool 20 into the center through hole 30, the axes of the tool 20 and the tool holder 22 are aligned, and as a result, the machining tool 20 and the machining horn are aligned. 1
The axes of 8 and 8 coincide. Therefore, when rotating the main shaft 12 to perform required machining, the machining tool 20 does not wobble in the radial direction, and a workpiece (not shown) can be subjected to ultrasonic machining with high precision.

On the outer periphery of the tool mounting end of the tool holder 22,
A second male threaded portion 46 is formed, and a socket nut 38 is screwed into this second male threaded portion 46 from the outside. That is, the socket nut 38 is formed with a hole 40 that can be inserted into the tool holder 22, as shown in FIGS. 2 and 3.

A female screw portion 40a is formed on the inner peripheral surface of the hole portion 40. Further, in the bottom of the hole 40 facing the first regulating surface 34 formed in the sleeve receiving hole 28, a through hole 42 through which the shank 20a of the processing tool 20 is inserted is bored at the center thereof.

Further, a second regulating surface 44 is formed at a portion extending radially outward from the through hole 42 in the bottom portion, and comes into contact with the tapered surface 36a of one of the fitting portions 36 provided on the sleeve 32. There is. The second regulating surface 44 is tapered so as to be inclined in the opening direction as it goes radially outward from the first through hole 42, and the female threaded portion 40a is connected to the tool holder 2.
When the sleeve 32 is screwed into the second male threaded portion 46 of
It functions to restrict the movement of the fitting part 36 in the axial direction and to deform the fitting part 36 inward in the radial direction.

Next, FIG. 4 shows a modification of the embodiment shown in FIG. 1, and is different from the embodiment shown in FIG.
The only difference is the internal structure, and the rest of the structure is the same. That is, the bottom of the hole 40 formed in the socket nut 38 has a recess 4 into which the sleeve 32 can be inserted.
8 was formed.

A through hole 42 is bored in the center of the bottom surface of this recess 48 .

A portion extending radially outward from this through hole 42 functions as a second regulating surface 44 that comes into contact with one fitting portion 36 provided on the sleeve 32 .

In addition, in this modification, the processing tool 20 can be firmly fixed to the tool holder 22 by using the sleeve 32 which is not provided with the fitting portion 36. Both shaft ends of the inserted sleeve 32 are connected to the first regulating surface 34 and the second regulating surface 44.
By screwing the socket collar 1-38 into the tool holder 22 while the sleeve 32 is in contact with the
It is pressed against 0a.

Effects of the Embodiment Next, the actual procedure for using the tool holding structure according to the embodiment will be explained. To attach the machining tool 20 to the machining horn 18, first the sleeve 32 is fitted onto the shank 20a of the machining tool 20. This machining tool 20 is
The tapered surface 36 of the fitting part 36 provided at one end of the sleeve 32 is fitted into the center through hole 30 of the tool holder 22 from one end of the sleeve 0a, and one end of the sleeve 32 is accommodated in the sleeve accommodation hole 28.
a is brought into contact with the first regulating surface 34.

Next, with the shank 20a of the machining tool 20 inserted into the through hole 42 of the socket nut 38, the female threaded portion 40a of the socket nut 38 is screwed into the second male threaded portion 46 of the tool holder 22.

By tightening the socket nut 38 in the direction shown in FIG. 36a. When the socket nut 38 is further screwed in, the female threaded portion 40a and the second male threaded portion 46 are tightened, and the sleeve 32 is compressed by the first regulating surface 34 and the second regulating surface 44, and is axially moved. Compressed.

At this time, the portion of the sleeve 32 accommodated in the sleeve accommodation hole 28 is as shown in FIG.

While radially outward deformation is restricted, both the first restriction surface 34 and the second restriction surface 44 deform the fitting portions 36 and 36 formed at both ends of the sleeve 32 inward in the radial direction. It has a taper that allows it to Therefore, both fitting parts 36.3
6 is crushed radially inward and bites into the shank 20a of the processing tool 20, thereby integrally fixing the processing tool 20 and the sleeve 32. Further, both ends of the sleeve 32 in the axial direction are firmly held between the first restricting surface 34 of the tool holder 22 and the second restricting surface 44 of the socket nut 38. As a result, the processing tool 20 is held securely and firmly by the tool holder 22.

After that, the tool holder 22 is moved as shown in FIG.
By screwing onto the open end of the processing horn 18,
Reliable attachment of the processing tool 20 to the main shaft 12 is completed.

Therefore, the ultrasonic vibrations from the machining horn 18 are efficiently transmitted to the machining tool 20. Moreover, since the axial center of the processing tool 20 and the axial center of the processing horn 18 are aligned, the processing tool 20 does not wobble when the main shaft 12 is rotated, and processing accuracy can also be improved. .

In an ultrasonic processing machine, when a pressing force is applied to the machining tool in the axial direction with the machining tool attached to the spindle, the force necessary for the machining tool to move relative to the spindle is applied. Holding force F and loss P, where holding force F is the power lost in the entire ultrasonic vibration system when ultrasonic vibration is applied to the tool while holding it, and P is the power lost in the entire ultrasonic vibration system. Figure 5 shows the relationship between

As is clear from the figure, when the holding force F is weak, the loss P increases rapidly, and when the holding force F becomes larger than the predetermined value F1, the loss P becomes approximately constant. According to the holding structure according to the embodiment, one person can hold the socket nut 38 by hand.
By tightening the machining tool 20 to the tool holder 22 and fixing the machining tool 20, a holding force greater than that of the above-mentioned F machining can be easily obtained. Therefore, the ultrasonic vibrations are efficiently transmitted via the machining horn 18, and the machining tool 20 can be prevented from loosening during machining.

In the embodiment, the case where the machining horn and the tool holder are configured separately is explained, but the present application is not limited to this, and the machining horn and the tool holder may be configured integrally. .

As described in detail of the invention, according to the tool holding structure for an ultrasonic processing machine according to the present invention, the processing tool can be reliably and easily attached to the processing horn of the ultrasonic processing machine, and the ultrasonic generating means can The generated ultrasonic imaging can be efficiently transmitted to the processing tool. Moreover, since inexpensive machining tools that are generally available on the market can be used as they are without any special machining, running costs can be kept low. Further, since the machining tool can be easily attached and detached, there is an advantage that the time required for replacement work can be shortened.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing the main shaft of an ultrasonic processing machine that employs a tool holding structure according to the present invention, and FIG. 2 is an enlarged sectional view showing an ill-th tool holding section. FIG. 3 is an exploded schematic perspective view of the tool holding part shown in FIG. 1, FIG. 4 is a sectional view of main parts showing a modification of the tool holding structure shown in FIG. 1, and FIG. 14 is a graph showing the relationship between holding force and loss of a machining tool. 14...Hollow main shaft 18...Machining horn 22...Tool holder 32...-Sleeve 34...First regulating surface 42... ...Through hole 16...Ultrasonic vibrator 20...Processing tool 28...Sleeve accommodation hole 32a...Through hole 38...Socket nut 44...Second regulating surface・I61 I62

Claims (1)

[Claims] An ultrasonic generating means (16) disposed inside a hollow main shaft (14) rotatably supported by the main spindle head and rotated by an appropriate driving means; A machining horn (18) has one end connected to the machining horn (16) and a tool mounting portion (22) at the other end.
18) In an ultrasonic processing machine that performs required processing on a workpiece by applying rotation and ultrasonic vibration to a processing tool (20) detachably attached to a tool mounting portion (22), A through hole (32a) through which the processing tool (20) can be inserted is formed in the sleeve (32) in the axial direction, and an open end of the tool mounting part (22) is bored in the axial direction,
The sleeve (32) into which the processing tool (20) is inserted is housed from one end side, and the sleeve (32) is housed in the inner part.
) a sleeve accommodation hole (28) formed with a first regulating surface (34) that comes into contact with one end side of the sleeve; a second regulating surface that has a through hole (42) and can come into contact with the other end side of the sleeve (32) on an inner side of the sleeve accommodation hole (28) that faces the first regulating surface (34); (44), at least one of the first and second regulating surfaces (34, 44) is formed as a tapered surface, and the tool mounting portion (22) In the process of screwing the socket nut (38) into the socket nut (38), the sleeve (32) fitted onto the processing tool (20) is inserted between the first regulating surface (34) of the sleeve receiving hole (28) and the socket nut (38). A tool holder for an ultrasonic processing machine, characterized in that the sleeve (32) is compressed by a second regulating surface (44) to reduce the diameter of the sleeve (32) inward in the radial direction and press against the processing tool (20). structure.