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1. 发明专利

JPH02303707A BALL END MILL 失效
公开(公告)号：JPH02303707A
公开(公告)日：1990-12-17
申请号：JP12040489
申请日：1989-05-16
申请人： MITSUBISHI HEAVY IND LTD
发明人： EGAWA TSUNEO , TERAI HISANOBU , KUWABARA HARUYOSHI , FUJII EIJI , TONOMURA TAMOTSU
IPC分类号： B23C5/10
摘要： PURPOSE:To eliminate a residual cutting in the vicinity of the end face center where the cutting edge peripheral speed is small by projecting the cutting edge of the end face center vicinity by a curve on the plane orthogonal with a rotating center shaft, and simultaneously making the cutting edge not coincident with the moving direction of a ball end mill. CONSTITUTION:A ball end mill 1 is formed with a cutting edge spirally on the side face, cutting edges 4a, 4b are formed at the extension part from the cutting edge of the side face and at the vicinity of a rotating center 2 semi-circular recessed cutting edges 3a, 3b in the radius R of curvature to the degree of the feeding of while the ball end mill 1 is rotated half are formed. The cutting edges 3, 4a, 4b are also arranged on the virtual sphere generated with the ball and mill 1 being rotated from the nature of the ball end mill 1. Consequently the phase of the cutting edge differs against the rotation of the ball end mill 1, the coincidence of the moving direction of the ball end mill 1 and the direction of the cutting edge 3 simultaneously in all is eliminated, residual cuttings are reduced and the surface roughness is improved.

2. 发明专利

JPH04152015A BALL END MILL 失效
公开(公告)号：JPH04152015A
公开(公告)日：1992-05-26
申请号：JP27234990
申请日：1990-10-12
申请人： MITSUBISHI HEAVY IND LTD
发明人： KUWABARA HARUYOSHI , EGAWA TSUNEO , FUJII EIJI , INAI FUMIO , FUKASAKU SHINICHI
IPC分类号： B23C5/10
摘要： PURPOSE:To prevent the occurrence of chipping, and to enhance finishing accuracy, in a ball end mill for carrying out three-dimensional machining to a metal mold or the like, by providing a chamfer in the intersecting part of the circular- arc shaped cutting edge of the shank end and the plane shaped cutting edge in the vicinity of the turning center. CONSTITUTION:In the ball end mill, a circular-arc shaped cutting edge 2 and a plane shaped cutting edge 3 are formed at the end of the shank. And a straight-line shaped chamfer 5 of a length l is formed in the intersecting part 4 of the circular-arc shaped cutting edge 2 and the plane shaped cutting edge 3. By the chamfer 5 provided, like this, in the intersecting part 4, stress concentration is not caused, and the chipping (minute break of cutting edge) of the cutting edges 2, 3 can be prevented.

3. 发明专利

JPH04183511A BALL END MILL 失效
公开(公告)号：JPH04183511A
公开(公告)日：1992-06-30
申请号：JP31130690
申请日：1990-11-19
申请人： MITSUBISHI HEAVY IND LTD
发明人： EGAWA TSUNEO , INAI FUMIO , FUKASAKU SHINICHI , FUJII EIJI
IPC分类号： B23C5/10
摘要： PURPOSE:To make the surface-roughness of a machined surface satisfactory by forming rake faces of a cutting blade which is positioned in the vicinity of the rotational center of the ball end mill adapted to be used for three- dimensional machining for a die or the like, in a normal rotational direction and a reverse direction, respectively. CONSTITUTION:A ball end mill 21 is formed thereon with an arcuated cutting blade 22 and a cutting blade 23, and is rotated counterclockwise so as to carry out cutting. Further, in addition to rake faces 24, 25, the cutting blades 22, 23 are formed thereon with rake faces 24, 25 between which the cutting blades 22, 23 are interposed, and rake faces 26, 27 are formed on the opposite surfaces thereof. Accordingly, in association with the feed and rotation of the ball end mill 21, the rake faces 24, 25, 26, 27 formed on the cutting blades 22, 23 in a normal rotational direction and in a reverse direction are moved in a direction in which cutting is made so that the cutting is made around the rotational center of the ball end mill 21. As a result, uncut parts during the process around the rotational center 1 can be reduced.

4. 发明专利

JPH04183509A MACHINING METHOD USING BALL END MILL 失效
公开(公告)号：JPH04183509A
公开(公告)日：1992-06-30
申请号：JP30881890
申请日：1990-11-16
申请人： MITSUBISHI HEAVY IND LTD
发明人： KUWABARA HARUYOSHI , EGAWA TSUNEO , FUJII EIJI , INAI FUMIO , FUKASAKU SHINICHI
IPC分类号： B23C3/00 , B23C5/10 , B23Q15/00
摘要： PURPOSE:To greatly enhance the surface-roughness with elimination of conical uncut parts on a workpiece by optimally setting the feed speed and rotational speed of a ball end mill, the lengths, and number of linear cutting blades formed at the forward end of the mill, and the intervals of repetitions of feed. CONSTITUTION:A ball end mill 26 is formed thereon with arcuated cutting blades 24, 25 with which the circular loci around the rotary axis 21 depict a substantially spherical surface, and a linear cutting blade 22 which is formed forward of the arcuated cutting edges 24, 25 and with which the circular loci about the rotary center axis 21 depict a substantially flat vertical surface. During machining the outer surface of a workpiece with the use of this ball end mill 26, repetitions of feeds relative to the ball end mill 26 are applied to the workpiece. In association with the movement of the ball end mill 26, relative to the workpiece, the feed speed, rotational speed and intervals of repetitions of feeds of the ball end mill are set so as to reduce uncut parts each produced at every revolution of the ball end mill.

5. 发明专利

JPS6478712A BALL ENDMILL MACHINING METHOD 失效
公开(公告)号：JPS6478712A
公开(公告)日：1989-03-24
申请号：JP22964487
申请日：1987-09-16
申请人： MITSUBISHI HEAVY IND LTD
发明人： EGAWA TSUNEO , TERAI HISANOBU , FUJII EIJI
IPC分类号： B23C5/10 , B23C3/00 , B23Q1/54
摘要： PURPOSE:To improve roughness of finished face and to lengthen service life of tool by rotating a spindle head such that the center of ball diameter of a ball endmill tool comes on the rotaty axis of the spindle head at all times, and varying inclination of the tool according to the shape of material to be cut. CONSTITUTION:Since rotary shaft of tool is inclined, no face is cut in the center of rotation of a ball endmill tool 1 and roughness of finished face is improved. When inclining direction of tool is varied around a cutting point, the tool 1 does not interfere with a material 2 to be cut not the coordinates of the cutting point require to be corrected, thus simplifying NC program. Since the cutting point can be varied freely, abrasion of tool is distributed resulting in a lengthened service life.

6. 发明专利

JPH04189411A BALL END MILL AND WORMING METHOD USING THE SAME 失效
公开(公告)号：JPH04189411A
公开(公告)日：1992-07-07
申请号：JP31623390
申请日：1990-11-22
申请人： MITSUBISHI HEAVY IND LTD
发明人： EGAWA TSUNEO , YOSHIOKA HAJIME , INAI FUMIO , FUKASAKU SHINICHI , FUJII EIJI
IPC分类号： B23C3/00 , B23C5/10
摘要： PURPOSE:To eliminate uncut portions by providing an annular cutting edge having the cutting edge located in an annular plane perpendicular to the rotary axis and an arcuate cutting edge surrounding the cutting edge and having the revolutional locus about the rotary axis showing an approximately spherical surface on the tip of a cylindrical mill body. CONSTITUTION:A cylindrical mill body 20 is formed on the tip coaxially with the axis 21 with an annular cutting edge 23 having the diameter (d) and the cutting edge 22 in a plane perpendicular to the rotary axis 21 and a conical relief surface 24 inside the annular cutting edge. Further, the annular cutting edge 23 is formed on the outer peripheral surface with a rake face 25. Two arcuate cutting edges 26, 27 making an approximately spherical surface of the rotary locus around the axis 21 are formed radically around annular cutting edge 23 and formed in the front face of the rotation direction with rake face 28, 29. Thus, while a planar groove having the width (d) and an arcuate surface contiguous to both sides of the planar groove due to the annular cutting edge 23 and cutting edges 26, 27 respectively are formed on the surface of a workpiece by the rotation of the mill, streaks and uncut conical portions are removed.

7. 发明专利

JPH04152014A MACHINING METHOD BY MEANS OF BALL END MILL 失效
公开(公告)号：JPH04152014A
公开(公告)日：1992-05-26
申请号：JP27322090
申请日：1990-10-15
申请人： MITSUBISHI HEAVY IND LTD
发明人： KUWABARA HARUYOSHI , EGAWA TSUNEO , FUJII EIJI , OKAMURA MAKOTO , FUKASAKU SHINICHI
IPC分类号： B23C3/00 , B23C5/10
摘要： PURPOSE:To prevent lowering of working-shape accuracy, when the three- dimensional machining of a metal mold or the like is performed by a ball end mill provided with both a circular-arc shaped cutting edge and a flat shaped cutting edge, by detecting and correcting the shortage of cutting amount of the flat shaped cutting edge through the machine tool side. CONSTITUTION:The purpose of the bed 1 of a ball end mill machining device is to support a work 2 to be cut, and guide parts 3 are formed on both sides thereof. The lower end parts of columns 4 are movably fitted into the guide parts 3. On the upper part of the columns 4, a cross-rail 5 is provided, and thereon a saddle 6 is movably mounted. To the saddle 6, a main spindle head 9 provided with a main spindle 8 is movably provided via a guide member 7, and to the main spindle 8, a ball end mill 10 is fitted. Further, to this machining device, a control unit 11 for controlling the moving amount of the main spindle 8 is connected. While a circular-arc shaped cutting edge 12 and a flat shaped cutting edge 13 are provided to the ball end mill 10, when cutting is carried out by the cutting edge 13, the shortage of the cutting amount of the cutting edge 13 is detected and corrected through the machining device side.

8. 发明专利

JPH02100811A SURFACE MACHINING 失效
公开(公告)号：JPH02100811A
公开(公告)日：1990-04-12
申请号：JP24748988
申请日：1988-10-03
申请人： MITSUBISHI HEAVY IND LTD
发明人： FUJII EIJI , TONOMURA TAMOTSU , TERAI HISANOBU , KUWABARA HARUYOSHI
IPC分类号： B23C3/16
摘要： PURPOSE:To remove a raw part on the surface of a workpiece left by an edge back part of a ball end mill during its reciprocatory movement to improve surface roughness by cuttingly moving the ball end mill only in one direction with its rotation to make surface machining. CONSTITUTION:An end mill is cuttingly moved from a point alpha1 to a point beta1 in a direction G on the upper surface part 12 of a mold 11 simultaneously with its rotating. The end mill is next returned from the point beta1 to the point alpha1 without cutting work, and then moved by moving distance Q from the point alpha1 to a point alpha2 in a direction Z perpendicular to the direction G. Since the upper surface part 12 is machined only during the movement of the end mill in the direction G, it can be machined without a raw part left by an edge back part to improve its surface roughness.

9. 发明专利

JPH02100810A SURFACE MACHINING 失效
公开(公告)号：JPH02100810A
公开(公告)日：1990-04-12
申请号：JP24748888
申请日：1988-10-03
申请人： MITSUBISHI HEAVY IND LTD
发明人： FUJII EIJI , TONOMURA TAMOTSU , TERAI HISANOBU , KUWABARA HARUYOSHI
IPC分类号： B23C3/16
摘要： PURPOSE:To remove a raw part left by an edge back part of a ball end mill by making the ball end mill perform return feed-machining without advance intersecting a direction of the movement of the ball end mill after its forward feed-machining. CONSTITUTION:A ball end mill is rotated, and fed forward from a point alpha1 to a point beta1 on the surface of a mold 11, and then returned from the point beta1 to the point alpha1 to remove a raw part left by an edge back part of the ball end mill. The end mill is next advanced from the point alpha1 in a z direction perpendicular to its reciprocatory direction, and reciprocated from a point alpha2 to a point beta2. The above-mentioned cutting process is repeated to remove the raw part left by the edge back part of the end mill on the surface of the mold 11, resulting in improved surface roughness.

10. 发明专利

JPS62255049A CONTROL DEVICE FOR FEEDING CUTTING TOOL 失效
公开(公告)号：JPS62255049A
公开(公告)日：1987-11-06
申请号：JP9681586
申请日：1986-04-28
申请人： MITSUBISHI HEAVY IND LTD
发明人： HATAMOTO TSUTOMU , FUJII EIJI
IPC分类号： B23Q17/09
摘要： PURPOSE:To prevent a cutting tool from being subjected to damage or abnormal abrasion by converting a sound, which is generated when discharged cut chips strike against a board, into an electric signal, detecting abnormality through comparing said signal with a reference electric signal, and thereby controlling feeding of the cutting tool. CONSTITUTION:Cut chips from a cutting tool 1 strike against a board to generate a sound. This sound is detected by a sound sensor 5 and converted into an electric signal 7 which is degitalized by an electric signal converter 6, and then input in a comparation operating part 9. A memory 8 stores therein a preliminarily set digitalized reference electric signal 12 which corresponds to the cutting sound at the time of normal cutting operation. These electric signals 7 and 12 are compared with each other by the comparation operating part 9. If the signal 7 differs widely with the signal 9, a stop signal is sent to a drive unit 10, then a driving system 14 is stopped. And if the signal differs therewith more or less, a feeding motor is controlled by the drive unit 10 so that the cutting condition resumes the normal level. Thus, it is able to cope with abnormality immediately, and damage of the cutting tool or abnormal abrasion can thereby the prevented.

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