JP2827209B2 - Cutting method of cylindrical body - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting a cylindrical body having a relatively large diameter into a desired length by scrapless cutting. . 2. Description of the Related Art Generally, as a method of forming a cylindrical body, a method of cutting one end from a coil material, seam welding a mating surface after roll forming, and finishing cutting both end surfaces is often used. As a law, it is strongly desired to establish a high-efficiency construction method by scrapless aiming at improving the yield. Hereinafter, an example of the above-described method for cutting a cylindrical body will be described with reference to the drawings. 4 and 5 show a schematic configuration of a cutting head portion in a conventional cylindrical body cutting method. In FIG. 4, reference numeral 1 denotes a cylindrical work (hereinafter referred to as a work), and 2 denotes a tool for cutting the work by a cutter. 3 is a cutter head having a slide guide groove 4 equally divided in the center direction,
The direction and support of the cutter 2 are adjusted, the cutter head gear 5 is fixed to the back, and the cutter 2 is rotatable rearward via a bearing. A cam head 6 is fixed to the case body 7 having the scroll chuck 12 and swings the cutter 2. Reference numeral 8 denotes a cutter support pin for transmitting the swing from the cam head 6 and supporting the same. 9 is a reduction gear, 10 is a main gear, and 11 is a motor. The operation of the cutting method of the cylindrical body configured as described above will be described below. First, the work 1 is inserted, fixed by the scroll chuck 12, and the switch of the motor 11 is turned on.
Is transmitted to the cutter head gear 5 via the reduction gear 9 to rotate the cutter head 3. Here, the cam head 6 fixed to the case body 7 is provided with a cam groove 12 having a non-uniform velocity shape as shown in FIG.
The cutter support pin 8 connected to the
, The cutter 2 has a cutter locus of 2a to 2f. That is, it swings like 2a to 2f, for example, 2b
In this state, the cutter 2 is located at the uppermost dead center in the circumferential direction of the slide guide groove 4 and moves toward the center as the rotation proceeds, and the work 1
And starts cutting, and becomes the bottom dead center at 2c. Or later
Up to 2d, the operation of one stroke in the slide guide groove 4 per one cutter 2 is performed. That is, between 2a and 2d, cutting and separation can be performed by setting the distance from the start of cutting to the completion of cutting to be 1/3 + α of the circumference of the work 1. Problems to be Solved by the Invention However, in the above configuration, it is impossible to support the inner surface of the work 1 as shown in FIG.
There was a problem that significant deformation as shown in FIG. 7 was accompanied in the 1c direction. SUMMARY OF THE INVENTION In view of the above problems, the present invention requires secondary finishing by cutting deformation of a cut end face to a minimum and cutting off deformation on at least one of the cut end faces when cutting a thin-walled cylindrical body. And a method for cutting a cylindrical body without scrap. Means for Solving the Problems In order to solve the above problems, a method for cutting a cylindrical body according to the present invention comprises a two-part slide die having a cutting blade substantially equal to the outer diameter of the cylindrical body, and a rotating spindle. A push-out center cam having one side inclined, a return center cam having a concave inclination at the same angle, and a linearly slidable 2 having an inclination at the same angle on the center side and the outer peripheral side of the spindle shaft. A pair of slide cams and a cutter are arranged on a shaft embedded in the slide cams. The cutting blade of the slide die and the cutter are positioned by a positioning stopper, and when the center cam is pushed out, the two pairs of slide cams expand evenly. When cutting is performed between the inner surface of the cylindrical body and the slide die located on the outer side and the center cam is pulled back, the cutter is securely removed from the cylindrical body. It is provided with such a configuration. According to the present invention, the cylindrical body is clamped by the two-part die having a diameter substantially equal to the outer diameter of the cylindrical body. , The two pairs of cutters expand uniformly in the circumferential direction, come into contact with the inner surface of the cylinder almost at the same time, and start cutting with the die. Therefore, spindle deflection can be significantly reduced, and cutting can be advanced while maintaining a constant clearance between the die and the cutter. In other words, by eliminating the deformation of the cut surface,
Scrapless cylinder cutting is possible. Also, if the center cam is pulled back simultaneously with the completion of cutting, the cutter follows its operation with the same accuracy and the same time, so that not only the cutting accuracy but also the effect of reducing chipping of the cutter and the like can be obtained. Example A method for cutting a cylindrical body according to an example of the present invention will be described below with reference to the drawings. FIG. 1 shows a cutter head for cutting a cylindrical body in an embodiment of the present invention. In FIG. 1, 1 is a cylindrical work (hereinafter referred to as a work), 2 is a slide die, which is divided into two, and has a shape substantially equal to the outer diameter of the work, and forms a cutting blade which can be cut in a part. Reference numeral 3 denotes a center cam for return, and a center cam 9 for pushing.
And a socket bolt 14, which are opposed to each other and have a partly inclined at the same angle. 5 is a cutter,
The bearing 6 is built in and is set on the shaft 7 and rotates freely when a load is applied. Reference numeral 8 denotes a slide cam, which has an inclination at the same angle as the return center cam 3 at both upper ends on the shaft center side, an inclination at the same angle as the pushing center cam 9 below the winning shaft center side, and a shaft 7 at a right angle. The slide cam having exactly the same shape is arranged in the cam holder 10 while maintaining the positional relationship between the inclined portion and the shaft with high accuracy. Here, the cam holder 10 is fixed to the spindle 1 by the convex portion 10a.
It is positioned at the center with 1 and connected and fixed by the socket bolt 12. The center hole of the cam holder 10 guides the axis of the pushing center cam 9 with high precision. A cutter holder 4 is connected and fixed to the cam holder 10. The operation of the cutting method of the cylindrical body configured as described above will be described below with reference to FIG. 1, FIG. 2, and FIG. First, FIG. 2 schematically shows the entire cutting apparatus, in which a work 1 is clamped from both sides by the pressure of an air cylinder 16 by a two-part slide die 2 located on a slide guide. After the clamp is completed, the slide base 23 located on the slide guide 26 is
When the stopper 27 is moved to the slide die 2 side, the stopper 27 falls down to the end face of the slide die 2, and the positioning of the cutter 5 and the cutting blade 2a provided on a part of the slide die is completed. Here, the cutter head below the spindle 11 is inserted into the inner surface of the work in a stationary state having a diameter smaller than the inner diameter of the work. The rotation is transmitted, and the spindle 11 supported by the case main body 17 starts rotating. When the pushing center cam 9 is pushed out by the pressure of the cylinder 21 while the spindle 11 is rotating, the pushing center cam 9 and the returning center cam 3 move in the Z direction as shown in FIG. At this time, the inclination 9a of the center cam 9 for pushing comes into contact with the inclination 8b of the slide cam 8, and the slide cam 8 is moved to the circumferential side X.
When extruded in the direction, the cutter 5 installed via the shaft 7 comes into contact with the inner surface of the work 1, and cutting with the die 2 proceeds while rotating. Since the cutting is completed within the rotation of the spindle 11 within at least 1/2 plus α from the limit state of the pushing center cam 9, if the pressure of the cylinder 21 is reversed after the rotation range, the returning center cam 3
The inclined portion 3a of the slide cam 8 comes into contact with the inclined portion 8a of the slide cam 8, and the slide cam 8 returns to the center direction. As described above, according to the present embodiment, a perfect circle is held by a two-part die having a cutting blade substantially equal to the outer diameter of the cylindrical body,
A push-out center cam that is inserted into a rotating spindle supported by the case body and has a slope on one side, a return center cam that has a concave slope at the same angle as the push-out center cam, and the spindle shaft center side and outer circumference side The two pairs of slide cams having the same angle of inclination and slidable linearly, and a cutter disposed on a shaft embedded in the slide cam, and a center cam guided by a center hole of the cam holder with high precision. When the inclined portions of the two pairs of slide cams are pushed and expanded by the inclined portions, the machining can proceed while maintaining the concentricity of the spindle and the two pairs of slide cams with high accuracy. The deflection of the spindle can be minimized. Further, when the center cam is pulled back, the cutter is sensitive to the operation thereof and can be surely separated from the cut portion of the cylindrical body. In the embodiment, the number of the cutters 5 is two, but if there is a space, three or four pairs may be used. Effect of the Invention As described above, the present invention clamps a workpiece with a perfect circular clamp by a two-piece slide die having a cutting blade substantially equal to the outer diameter of a cylindrical body, inserts the workpiece into a rotating spindle, and extrudes one side with an inclination. A center cam, a return center cam having a concave inclination at the same angle as the pushing center cam, and two pairs of linearly slidable slide cams having the same inclination at the center and outer periphery of the spindle shaft; When the cutter is arranged on the shaft embedded in the slide cam and the center cam is pushed out, the two pairs of slide cams expand evenly in the circumferential direction and start cutting between the cutter and the cutting blade. In order to receive evenly and opposingly, the cutting process proceeds by holding down the spindle deflection and keeping the clearance between the die and the cutter constant, thereby reducing the deformation of the cut surface. Small, scrapless cylinder cutting is possible. Further, when the center cam is pulled back, the cutter reacts sensitively and can be reliably separated from the cutting portion, so that cutting accuracy is improved and chipping of the cutter can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1a and 1b are a plan view and a sectional view showing a cutter head portion of a cutting method for a cylindrical body according to an embodiment of the present invention, and FIG. FIG. 3 is a view showing the progress of the cutter in the cutter head section of FIG. 1, FIG. 4 is a schematic view of a cutting head section in a conventional cylindrical body cutting method, and FIG. 5 is a cam state of a cam head section. FIG. 6 is a diagram showing a cutting load direction in FIG. 4, and FIG. 7 is a diagram showing a deformation of a workpiece at the time of cutting in a conventional cylindrical body cutting method. 2 ... slide die, 3 ... center cam, 5 ... cutter, 6 ... bearing, 7 ... shaft, 8 ... slide cam, 11 ... spindle.

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A-53-80882 (JP, A) JP-A-60-114414 (JP, A) JP-B-57-25694 (JP, B2) (58) Field (Int.Cl. ⁶ , DB name) B23D 21/14

Claims (1)

(57) [Claims] In cutting a thin cylindrical body, a two-part slide die having a cutting blade substantially equal to the outer diameter of the cylindrical body, an extruding center cam that is inserted through a rotating spindle and has an inclination on one side, and the extruding center cam, A return center cam having a concave inclination at the same angle, two pairs of linearly slidable slide cams having the same inclination at the spindle shaft center side and the outer peripheral side, and embedded in the slide cam. When a cutter is arranged on the shaft and the center cam is pushed out, the two pairs of slide cams are uniformly enlarged in the circumferential direction, and between the cutter and the cutting blade, the cylindrical body is cut from the inner surface without scrap, A method for cutting a cylindrical body, wherein the cutter is reliably separated from the cylindrical body when the center cam is pulled back.