JPH0885038A - Processing machine - Google Patents

Abstract

PURPOSE: To prevent the occurrence of chipping so as to stably obtain a high- quality product by installing a pressing force adjusting mechanism for pressing a main spindle integrally with a sleeve to the lower side of a housing on the upside of the housing. CONSTITUTION: After a material 10 to be processed is clamped on a table 4 of a processing machine 1, a cross-feed handle 7 and a longitudinal feed handle are rotated, whereby a drilled part of the material 10 to be processed is adjusted to be set in a designated position of the central part of a cutting tool 14, and the rotating speed of a main spindle 12 where the cutting tool 14 is previously mounted and the pressing force of a pressing force adjusting mechanism 21 are adjusted to optimum values according to the material quality of the material to be processed and the size of a part to be processed. In the midst of desired chamfering for the material 10 to be processed, even if the pressing force applied to the cutting tool 14 by the operation of a processing handle 9 becomes larger than a preset pressing force, the main spindle 12 is pushed up against a coiled spring 22, so that the material to be processed will not be cut more than needed by the cutting tool 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing machine for chamfering a processed part after processing such as grooving and boring on a workpiece, and more particularly to holding a tool in the processing machine. The present invention relates to a processing machine equipped with a pressing force control mechanism for keeping the pressing force of the main spindle constant.

[0002]

2. Description of the Related Art Generally, the groove of a workpiece or the edge of a perforated portion may be chamfered or deburred manually by using various tools. As shown in Japanese Patent Publication No.-2851 or the like, a deburring or chamfering process is mechanically performed by using a machining center or an ordinary processing machine such as a drilling machine, a milling machine or a lathe. There is.

That is, in a processing machine having a conventional structure such as a drilling machine, as shown in FIG. 3, for example, a column 51 standing upright at the rear of the bed 50, a head 52 provided above the column 51, and a head 52. It has a main shaft portion 53 that is vertically movable with respect to the table 50, and a table 54 that is vertically and horizontally movable with respect to the bed 50, and the like. Are to be placed.

A cutting tool 57 such as a chamfering grindstone is mounted on the tip of the main shaft portion 53 via a chuck device 56. The main shaft portion 53 and the head 52 are well-known rack and pinion mechanisms. The main shaft portion 53 is coupled by (not shown), and by operating the processing handle 58.
Is held so that it can move up and down. Then, the main shaft portion 5
The cutting tool 57 mounted on the No. 3 is controlled by the motor 59 and the transmission 60 to rotate at a predetermined number of revolutions, and chamfers a hole or the like of the workpiece 55.

When chamfering the perforated portion of the workpiece 55 based on the above construction, first, the workpiece 55 is clamped on the table 54 of the processing machine, and then a handle (not shown) is rotated. Table 54 is moved back and forth, left and right, and up and down, and the perforated portion of workpiece 55 is cut by cutting tool 57
Is adjusted so that it is set at a predetermined position in the center of the machine, and the machining handle 58 is operated to lower the spindle 53 while driving the motor 59 by operating a main switch (not shown) or the like. Tool 57 is the workpiece 5
A desired chamfering process is performed by pressing against the perforated portion of No. 5.

[0006]

However, as described above, when the chamfering of the drilling portion is carried out by using an ordinary processing machine, the tip of the cutting tool is processed only by the operation of the handle of the operator. Since the chamfering is performed while pressing it against the part, it is difficult to finely adjust the processing pressure, and the chamfering allowance is not constant and there are technical problems such as variations in products.

Further, when chamfering the perforated portion or groove portion of a work material formed of a brittle material or the like, chipping such as chipping of a corner portion of the processed portion due to fluctuation of processing pressure for pressing a cutting tool or the like occurs. However, there is a problem in that it is likely to occur and a high quality product cannot be stably obtained.

The present invention has been made in order to solve the above-mentioned problems of the conventional processing machine, and its purpose is to change the pressing force of the tool spindle held in the processing machine to the material of the material to be processed. It is intended to provide a processing machine capable of high-quality processing by adjusting accordingly.

[0009]

In order to achieve the above-mentioned object, a processing machine according to the present invention is mounted on a main pillar standing upright on a rear side of a bed and an upper surface of the bed to clamp a workpiece. Machining with a table, a head mounted on the upper part of the main pillar so as to be movable in the front-rear direction, and a main shaft part that is connected to the front end part of the head by a rack and pinion mechanism and is held vertically movable by the operation of the handle In the machine, a cylindrical sleeve is vertically movably supported in the housing of the main spindle portion, a main spindle having a cutting tool attached is rotatably supported at the central portion of the sleeve, and the main spindle is a sleeve on the upper part of the housing. It is provided with a pressing force adjusting mechanism that presses the lower part of the housing together. The pressing force adjusting mechanism includes a coil spring inserted into the upper end of the main shaft and a spring pressure adjusting unit screwed into the upper end of the housing to adjust the pressing force of the coil spring. The pressing force of the coil spring can be arbitrarily adjusted by rotating the pressure adjusting unit.

[0010]

According to the present invention based on such a configuration,
A spindle equipped with a cutting tool is rotatably and vertically supported in the housing of the spindle that is connected to the front end of the head by a rack and pinion mechanism and is held so that it can be moved vertically by operating the processing handle. At the upper end, install a pressing force adjusting mechanism consisting of a coil spring and a spring pressure adjusting part screwed to the upper end of the housing to adjust the pressing force of the coil spring, and rotate the above spring pressure adjusting part. By moving it, the pressing force of the coil spring that presses the main shaft below the housing can be adjusted arbitrarily, so the processing handle can be used while the desired chamfering is being performed on the workpiece. Operation causes the spindle to push up against the coil spring even if the pressing force applied to the cutting tool exceeds the preset pressing force. It is, will not be cut unnecessarily by the cutting tool.

Therefore, the occurrence of chipping or the like can be prevented by adjusting the pressing force of the spindle equipped with the cutting tool to an appropriate value according to the material of the material to be processed and the size of the machining allowance. A high quality product can be stably obtained.

[0012]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a partially cutaway front view showing the main part of a processing machine according to the present invention, and FIG. 2 is a side view showing the overall construction of the processing machine according to the present invention. A rotary cutting machine is used.

First, as shown in FIG. 2, the processing machine 1 includes a main pillar 3 standing upright on the rear side of a bed 2, a table 4 mounted on the upper surface of the bed 2 so as to be movable left and right, and the above-mentioned structure. A head 5 mounted on the upper part of the main pillar 3 so as to be movable in the front-rear direction.
And a main shaft portion 6 held at the front end portion of the head 5 so as to be vertically movable.

The work piece 10 is fixed to the upper surface of the table 4 by an ordinary clamp mechanism (not shown), and the table 4 is moved in the left-right direction by the rotation of the lateral feed handle 7. The position of the head 5 holding the main shaft portion 6 can be adjusted by moving the front-rear feed handle 8 in the front-rear direction.

The main shaft portion 6 and the head 5 are the well-known rack and
The spindle 6 is coupled by a pinion mechanism (not shown), and the main shaft 6 is held vertically movable with respect to the head 5 by operating the processing handle 9.

A main shaft 12 is rotatably supported at the center of the housing 11 of the main shaft 6, and the main shaft 1
A cutting tool 14 such as a grindstone is attached to the lower end of 2 via a chuck device 13, and a motor 15 and a transmission 16 are attached to the upper end of the spindle 12 via a coupling 17. Then, the rotation of the motor 15 is adjusted to a predetermined number of rotations by the transmission 16, and the main shaft 1
2 is transmitted.

On the other hand, in the main shaft portion 6, as shown in FIG. 1, a cylindrical sleeve 19 is movably supported in a cylindrical housing 11 via a thrust bearing 18 and the like, and a ball bearing is supported on the sleeve 19. A main shaft 12 is rotatably supported via a shaft 20 and the like, and a main shaft 1 supported by a sleeve 19 is provided above the housing 11.
2 is pressed against the housing 11 together with the sleeve 19 below the housing 11.
1 is installed.

The pressing force adjusting mechanism 21 includes a coil spring 22 inserted into the upper end of the main shaft 12 and a spring pressure adjusting portion screwed into the upper end of the housing 11 to adjust the pressing force of the coil spring 22. 23, the pressing force of the coil spring 22 can be arbitrarily adjusted by rotating the spring pressure adjusting portion 23.

Next, based on the embodiment of the present invention configured as described above, the operation of chamfering the perforated portion of the workpiece 10 will be described.

First, after the work material 10 is clamped on the table 4 of the processing machine 1, the transverse feed handle 7 and the front-back feed handle 8 are rotated so that the perforated portion of the work material 10 is the cutting tool 14. The adjustment is performed so that the cutting tool 14 is set at a predetermined position, and the rotation speed of the spindle equipped with the cutting tool 14 and the pressing force of the pressing force adjusting mechanism 21 are set to the material of the workpiece 10 and the size of the processing portion. Adjust to an appropriate value corresponding to.

Next, while the motor 15 is driven by operating a main switch (not shown) or the like, the processing handle 9 is operated to lower the main spindle portion 6 and the cutting tool 14 is used as a perforated portion of the workpiece 10. A desired chamfering process is performed by pressing.

In this way, the pressing force applied to the cutting tool 14 by the operation of the processing handle 9 during the desired chamfering of the workpiece 10 becomes larger than the preset pressing force. Even in this case, the main shaft 12 is pushed up against the coil spring 22 and the cutting by the cutting tool 14 becomes impossible, so that the chamfering margin is not sharply cut more than necessary.

When the work material 10 is a brittle material or the like, the pressing force of the spindle 12 having the cutting tool 14 mounted thereon is adjusted to a minute pressure to prevent chipping and the like and to achieve high quality. The product of can be obtained stably.

In the embodiment according to the present invention, the spindle 12
Is rotationally driven via the motor 15 and the transmission 16, but the present invention is not limited to this, and may be rotationally driven via a transmission member such as a belt from the motor. Although it is possible to change the rotation speed, it is desirable to control the rotation speed of the main shaft so that the rotation speed can be arbitrarily changed within the range of 0 to 1200 rpm by using a continuously variable transmission. Further, although the main shaft portion 6 is formed so as to be vertically movable with respect to the head 5 in the above-described embodiment, the main shaft portion 6 may be fixed to the head 5 and the housing 11 may be vertically movable with respect to the main shaft portion 6. .

In the embodiment of the processing machine according to the present invention,
The pressing force control mechanism of the cutting tool 14 when the chamfering process is mainly performed on the perforated portion of the workpiece 10 has been described.
The present invention is not limited to this, and is applicable to a processing machine used for drilling, milling and other processing.

[0027]

As described above in detail, the processing machine according to the present invention is provided with a main pillar that is erected on the rear side of the bed, a table that is mounted on the upper surface of the bed and clamps a workpiece, and the main pillar. A machine having a head mounted on the upper part of the head so as to be movable in the front-rear direction, and a main shaft part which is connected to a front end part of the head by a rack and pinion mechanism and is vertically movable by the operation of a processing handle. Upper and lower ends of the main shaft in order to support the cylindrical sleeve in the housing of the part so as to be movable up and down, rotatably support the main shaft in the center of the sleeve, and press the main shaft together with the sleeve below the housing. Install a pressing force adjusting mechanism consisting of a coil spring and a spring pressure adjusting part screwed on the upper end of the housing to adjust the pressing force of the coil spring. By rotating the spring pressure adjustment part, the pressing force of the coil spring that presses the main shaft downwardly of the housing can be adjusted arbitrarily, so the desired chamfering process can be performed on the workpiece. In addition, even if the pressing force applied to the cutting tool by operating the processing handle becomes larger than the preset pressing force,
The main shaft is pushed up against the coil spring, preventing unnecessary cutting by the cutting tool.

Therefore, it is possible to adjust the pressing force of the spindle equipped with the cutting tool to an appropriate value in accordance with the material of the material to be processed and the size of the machining allowance, especially for brittle materials. When cutting a work material, by finely adjusting the pressing force of the spindle, it is possible to prevent the occurrence of chipping and stably obtain a high-quality product.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a main part of a processing machine according to the present invention.

FIG. 2 is a side view showing the overall configuration of a processing machine according to the present invention.

FIG. 3 is an overall configuration diagram showing a processing machine having a conventional structure.

[Explanation of symbols]

 1 Processing Machine 2 Bed 3 Main Pillar 4 Table 5 Head 6 Spindle Part 11 Housing 12 Spindle 14 Cutting Tool 19 Sleeve 21 Pressing Force Adjusting Mechanism 22 Coil Spring 23 Spring Pressure Adjusting Part 50 Head 51 Main Pillar 53 Spindle 54 Table 59 Mo- Ta

Claims (2)

[Claims] 1. A main pillar standing upright at the rear of the bed, a table mounted on the upper surface of the bed for clamping a workpiece, and a head mounted on the upper portion of the main pillar so as to be movable in the front-rear direction. In a processing machine having a main shaft part which is connected to a front end part of a head by a rack and pinion mechanism and is vertically movable by operating a processing handle, a cylindrical sleeve is supported in the housing of the main shaft part so as to be vertically movable. A rotatably supporting spindle with a cutting tool attached to the center of the sleeve, and a pressing force adjusting mechanism for pushing the spindle together with the sleeve to the lower part of the housing at the upper part of the housing. Machine. 2. The pressing force adjusting mechanism comprises a coil spring inserted into the upper end of the main shaft, and a spring pressure adjusting unit screwed into the upper end of the housing for adjusting the pressing force of the coil spring. The processing machine according to claim 1, wherein the pressing force of the coil spring can be arbitrarily adjusted by rotating the spring pressure adjusting unit.