JP3511397B2 - Method for preventing chip accumulation on machine tool and chuck for machine tool - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip accumulation preventing method for a machine tool which prevents chips from accumulating on a chuck for gripping a work, and a chuck for the machine tool.

[0002]

2. Description of the Related Art Conventionally, a machine tool such as a crankshaft mirror or a camshaft mirror for cutting an axial work such as a crankshaft or a camshaft is provided with a chuck for gripping both ends of the work. In an automated machine tool, since the work is loaded and unloaded by the work loading and unloading device, chips generated during machining adhere to the jaws of the chuck and the reference seat for positioning the work. If so, the work cannot be positioned at a predetermined position, or an error occurs between the center of the work and the center of the chuck, making it impossible to perform highly accurate cutting. For this reason, conventionally, as shown in FIG. 1, an air blow hole c for blowing air toward the claw b is provided in the chuck a, and the work d
The chips adhering to the nail body b and the like are blown off when replacing the.

However , the work d is attached to the fixed chuck a.
In a machine tool that grips and processes a workpiece d, a substantially U-shaped notch e is formed in the upper portion of the chuck a so that the chuck a and the workpiece d do not interfere with each other when the workpiece d is carried in and out. For this reason, a large amount of chips generated during processing of the work d are accumulated in the notch e. Therefore, even if air is blown from the air blow hole c when the work d is replaced, the chips accumulated in the notch e should be blown off. There is a problem that you can not. In order to prevent such a problem, a pipe dedicated to air blow is installed to blow air of higher pressure to blow off the chips accumulated in the notch e. However, in this method, a separate pipe for air blow is used. Since it has to be provided, the cost is high, and since the air is blown with a stronger pressure, chips are scattered around and it takes time to clean.

On the other hand , as disclosed in , for example, Japanese Patent Application Laid-Open No. 1-222841, chips and scraps are produced by ejecting air around the suction port of a suction head to form an air curtain so that chips and the like can be efficiently sucked. Removal devices have also been proposed.

[0005]

However , the chip and debris removing device disclosed in the above publication has an air curtain formed around the suction port in order to efficiently suck the chips generated during cutting. However, the air curtain did not prevent the accumulation of chips. The present invention has been made in view of the above conventional circumstances, and an object of the present invention is to provide a method for preventing chip accumulation in a machine tool and a chuck for a machine tool that prevent chips from accumulating in the chuck due to an air curtain. It is a thing.

[0006]

In order to achieve the above object, the present invention provides a chuck body for holding both ends of a work to be machined with notches for carrying in and out the work, and In the chip accumulation prevention method of a machine tool, which has an air blow hole for blowing off the chips adhering to the claws and reference seats and workpieces provided on the chuck body in the lower part, an air blow hole is provided at the upper part of the notch of the chuck body. provided, by forming the air curtain to the notch upper by air which is blown from the in workpiece machining this air blow hole, to prevent the chips generated during the workpiece machining falls deposited on the switching within outs, the workpiece 3 When loading
And a method for preventing the accumulation of chips in a machine tool, in which air is blown from an air blow hole provided in the lower portion of the chuck main body after the machining of the work 3 is completed . Further, the chuck body that holds both ends of the work to be processed is provided with a notch for loading and unloading the work, and the lower part of the chuck body is attached to the claw body, the reference seat, and the work provided on the chuck body. in chuck of a machine tool provided with air blow hole to blow the chips, to the notch upper, provided with air blow holes which form an air curtain in the notch upper by air and blown, air blowing, workpiece loading during及
And a chuck of a machine tool which is carried out from an air blow hole provided in the lower part of the chuck body after the completion of the work processing, and from an air blow hole provided in the upper part of the notch during the work processing . Further, the chuck of a machine tool is provided with a plurality of air blow holes forming an air curtain.

[0007]

[Operation] With the above structure, the air curtain formed above the notch of the chuck body during machining of the workpiece prevents chips from falling and accumulating inside the notch. It does not hinder positioning and gripping.

[0008]

Embodiment An embodiment of the present invention will be described in detail with reference to the drawings shown in FIG. FIG. 2 is a sectional view of a chuck of a machine tool which implements the method of the present invention, and FIG. 3 is a front view thereof.
In these drawings, reference numeral 1 denotes a pair of chuck main bodies, which are non-rotatably attached to the facing surfaces of a pair of work heads 2 provided on the machine tool. A center 4 is provided at the center of the chuck body 1 for centering the work 3 by fitting it into center holes 3a formed at both ends of the work 3, and the periphery of the center 4 has three directions. The claw body 5 is provided in the. These claws 5 are engaged with an actuating rod 6 having a wedge-shaped inclined surface 6a at the tip, and the claws 5 are actuated in the axial direction by a clamp cylinder (not shown), whereby the claws 5 are moved to the chuck body. It can move in the radial direction of 1 to grip both ends of the work 3 supported by the center 4.

On the other hand , the work 3 is loaded and unloaded from above between the chuck bodies 1 by a work loading and unloading device (not shown). At the upper front side of each chuck body 1, both ends of the chuck body 1 and the work 3 are placed. Notch 1 to avoid interference
a is provided in the vertical direction. Also , the chuck body 1
A plurality of air blow holes 1b are formed in the lower peripheral portion of the center 4, and another air blow hole 1c is formed in the upper portion of the notch 1a. Air blow hole 1 b provided on the lower side peripheral portion of the center 4 have a step is formed in the longitudinal as shown in FIG. 2, by the blown air from these air blow hole 1b, and the claw 5 and the workpiece 3, Reference seat 6
Being adapted to blow off such as chips adhering to such, the air that has been blown from the air blow hole 1 c provided at the top of the notch 1a, the air curtain 8 is formed horizontally on the top of the notch 1a It has become so. Their by <br/>, these air blow holes 1b, 1c chuck body 1
It is connected to an air source such as factory air (not shown) through an air passage 1d formed inside.

Next, a method of preventing the accumulation of chips will be described.
A new work 3 by a work loading / unloading device (not shown)
When the workpiece is loaded, the chips adhering to the claw body 5, the center 4, the reference seat 6, etc. are blown away and removed by the air blown from the air blow hole 1b of the chuck body 1 before the work 3 reaches the predetermined position. It After that , the work 3 carried into the predetermined position is first supported at both ends by the center 4 and then rotated until the reference surface 3b comes into contact with the reference seat 6 to perform phase indexing. When the phase indexing is completed, each nail 5
Is moved toward the center and both ends of the work 3 are gripped by the claws 5, and the loading of the work 3 is completed.

After that, the cutter drum 10 is rotated,
With the cutter 11 attached to the cutter drum 10, FIG.
As shown by the phantom line, the cutting of a predetermined portion of the work 3 is started, and at the same time, air is blown from the air blow hole 1c provided in the upper portion of the notch 1a of the chuck body 1 and the air is blown to the upper portion of the notch 1a. The curtain 8 is formed. As a result, even if the chips generated during cutting reach above the notch 1a, the air curtain 8 prevents the chips from falling into the notch 1a, so that the chips generated during cutting process inside the notch 1a. It becomes possible to prevent it from being deposited. Note that reference numeral 12 in FIG. 2 indicates a work rest that supports the work 3 being processed.

When the cutting of the work 3 is completed as described above, the blowing of air from the air blow holes 1c is stopped, and then the air is blown from the plurality of air blow holes 1b, and the work 3, the pawl 5, and the reference seat. Work piece 3 that has been machined after the chips adhering to 6 etc. have been blown off and removed
Is carried out, and the work 3 to be processed next is carried in. By repeating the above operation, a plurality of works 3 can be machined one after another.

[0013] Incidentally, air blow to form the air curtain 8 may be the air blow and a separate system to blow the chips adhered as a work 3 and pawl 5, but in the same system by adding a solenoid valve Good. In this case, the air blow solenoid valve on the side of the air curtain 8 is turned off while the air blow that blows off the chips adhering to the work 3 and the claw body 5 is used, and conversely, when the air curtain 8 is formed, the side of the air blow at which the chips are blown off. Turn off the solenoid valve. Further , in the above embodiment, the number of the air blow holes 1c forming the air caten 8 is one, but a plurality of air blow holes 1c may be provided.
In addition, the removal of chips by the air curtain,
An air blower that blows off chips adhering to the reference seat, work, etc.
By using the low together
It is possible to cancel the case.

[0014]

As described above in detail, according to the present invention, an air blow hole is provided in the upper portion of the notch of the chuck for gripping the work, and an air curtain is formed in the upper portion of the notch by the air blown from the air blow hole during processing of the work. Therefore, since the chips generated during processing do not fall into the notches and accumulate, there is no hindrance to the loading and unloading of the work, and when positioning or gripping the loaded work, Since chips do not get caught between the work and the reference seat or between the work and the claws, it is possible to perform highly accurate positioning and grasp the work, and prevent defective machining of the work. Moreover , since the wear and damage of the reference seat and the like are reduced by eliminating the cutting chips being caught , it is possible to more reliably eliminate the problems caused by the cutting chips by enabling highly accurate positioning over a long period of time. it can. Furthermore, since it can be carried out only by providing an air blow hole for an air curtain in an existing chuck, it is economical.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a chuck of a conventional machine tool.

FIG. 2 is a partially cutaway front view of a chuck of a machine tool and a work held between the chucks according to an embodiment of the present invention.

FIG. 3 is a view taken in the direction of the arrow X in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Chuck main body, 1a ... Notch, 1b, 1c ... Air blow hole, 3 ... Work, 5 ... Claw body, 6 ... Reference seat, 8 ... Air curtain.

Claims (3)

(57) [Claims] 1. A notch 1 for loading and unloading a work 3 into and from a chuck body 1 which holds both ends of the work 3 to be processed.
a is provided, and at the bottom of the chuck body 1, the claw body 5, the reference seat 6, and the work 3 provided on the chuck body 1 are provided.
In a method for preventing the accumulation of chips in a machine tool, which is provided with an air blow hole 1b that blows off the chips adhering to, etc., an air blow hole 1c is provided above the notch 1a of the chuck body 1 and blows from the air blow hole 1c during machining of a workpiece. By forming the air curtain 8 on the upper portion of the notch 1a by the generated air, the chips generated during the work processing of the notch 1a
is prevented from falling deposited in a, of the workpiece 3 conveyed during及
And a method for preventing the accumulation of chips in a machine tool, characterized in that air is blown from an air blow hole 1b provided in a lower portion of the chuck body 1 after the machining of the workpiece 3 is completed . 2. A chuck body 1 for gripping both ends of a work 3 to be machined is provided with a notch 1a for loading and unloading the work 3, and a claw body provided on the chuck body 1 is provided below the chuck body 1. In the chuck of the machine tool provided with the air blow hole 1b for blowing off the chips adhering to the No. 5, the reference seat 6 and the work 3, etc., above the notch 1a,
An air curtain 8 is provided above the notch 1a by the blown air.
The air blow hole 1c for forming the provided air blow, Wa
The chuck body 1 at the time of carrying in the workpiece and after the work processing is completed.
Work from the air blow hole 1b provided at the bottom of the
Inside is an air blow hole 1c provided above the notch 1a.
A machine tool chuck characterized by being performed from 3. The chuck of a machine tool according to claim 2, wherein a plurality of air blow holes 1c forming the air curtain 8 are provided.