阅读说明：本技术 一种数控车床及使用方法 (Numerical control lathe and using method ) 是由 王永奇 于 2020-02-14 设计创作，主要内容包括：本发明公开了一种数控车床及使用方法,其结构包括脚架、机箱、工作台、纵向移动架、加工座、横向移动架、支撑柱,脚架竖直安装于机箱下端,工作台水平安装于机箱上端,纵向移动架竖直安装于机箱上端,横向移动架水平安装于纵向移动架正面,加工座设于横向移动架前端,支撑柱固定于纵向移动架之间,工作台包括卡盘、卡爪、内槽,内槽设于卡盘内侧,卡盘嵌入于内槽,卡爪设有三个并且环形分布,本发明在固定块左侧设置了卡块,防止在加工时造成盘类零件的偏移,提高了零件的加工精度；在卡块内侧设置了限位结构,更好的对扇形盘类零件进行装夹,防止其在加工中造成偏移,使加工的位置更加的准确,从而提高了加工精度。(The invention discloses a numerical control lathe and a using method thereof, the structure of the numerical control lathe comprises a foot rest, a case, a workbench, a longitudinal moving frame, a processing seat, a transverse moving frame and support columns, wherein the foot rest is vertically arranged at the lower end of the case, the workbench is horizontally arranged at the upper end of the case, the longitudinal moving frame is vertically arranged at the upper end of the case, the transverse moving frame is horizontally arranged on the front surface of the longitudinal moving frame, the processing seat is arranged at the front end of the transverse moving frame, the support columns are fixed between the longitudinal moving frames, the workbench comprises a chuck, clamping jaws and an inner groove, the inner groove is arranged at the inner side of the chuck, the chuck is embedded in the inner groove, and the clamping jaws are distributed annularly; the limiting structure is arranged on the inner side of the clamping block, so that the fan-shaped disc parts can be better clamped, the fan-shaped disc parts are prevented from being deviated in machining, the machined positions are more accurate, and the machining precision is improved.)

1. A disc-type vertical multi-spindle numerical control lathe structurally comprises a foot rest (1), a case (2), a workbench (3), a longitudinal moving frame (4), a machining seat (5), a transverse moving frame (6) and support columns (7), wherein the foot rest (1) is vertically installed at the lower end of the case (2), the workbench (3) is horizontally installed at the upper end of the case (2), the longitudinal moving frame (4) is vertically installed at the upper end of the case (2), the transverse moving frame (6) is horizontally installed on the front face of the longitudinal moving frame (4), the machining seat (5) is arranged at the front end of the transverse moving frame (6), and the support columns (7) are fixed between the longitudinal moving frames (4); the method is characterized in that:

the workbench (3) comprises a chuck (31), clamping jaws (32) and an inner groove (33), wherein the inner groove (33) is formed in the inner side of the chuck (31), the chuck (31) is embedded in the inner groove (33) and is installed on the outer side of the chuck (31), and the clamping jaws (32) are three and distributed in a ring shape;

jaw (32) are including big bevel gear (321), remove seat (322), press from both sides tight structure (323), small bevel gear (324), big bevel gear (321) upper end is located in removal seat (322), press from both sides tight structure (323) horizontal installation in removing seat (322) upper end, small bevel gear (324) run through in chuck (31) and big bevel gear (321) lower extreme mesh mutually.

2. The disc-type vertical multi-spindle numerically controlled lathe according to claim 1, characterized in that: the clamping structure (323) comprises a fixing block (23a), a sliding groove (23b) and a clamping block (23c), the sliding groove (23b) is formed in the outer side surface of the fixing block (23a), and the clamping block (23c) is embedded in the inner side of the fixing block (23 a).

3. The disc-type vertical multi-spindle numerically controlled lathe according to claim 2, characterized in that: a rotating shaft (3c1) penetrates through the inner side of the clamping block (23c), the rotating shaft (3c1) is embedded and installed at the left end of the inner side of the fixing block (23a), and the moving angle between the clamping block (23c) and the fixing block (23a) is 0-60 degrees.

4. The disc-type vertical multi-spindle numerically controlled lathe according to claim 3, characterized in that: auxiliary blocks (3c2) are arranged on two sides of the clamping block (23c), the outer side of each auxiliary block (3c2) extends to the side face of the clamping block (23c) in an arc shape, and grooves are embedded in the auxiliary blocks (3c 2).

5. The disc-type vertical multi-spindle numerically controlled lathe according to claim 4, characterized in that: the upper end of the clamping block (23c) is provided with a edge plate (3c3), and the edge plate (3c3) is fixedly connected to the upper ends of the clamping block (23c) and the auxiliary block (3c 2).

6. The disc-type vertical multi-spindle numerically controlled lathe according to any one of claims 2 to 5, wherein: the inner side of the left end of the clamping block (23c) is provided with an arc groove (3c4) and a limiting structure (3c5) positioned on the inner side, and the limiting structure (3c5) is obliquely distributed on the inner side of the arc groove (3c 4).

7. The disc-type vertical multi-spindle numerically controlled lathe according to claim 6, characterized in that: the limiting structure (3c5) comprises a limiting plate (c51), a movable plate (c52), a movable shaft (c53) and a friction plate (c54), the movable plate (c52) is fixed at the rear end of the limiting plate (c51), the movable shaft (c53) penetrates through the inner side of the movable plate (c52), and the friction plate (c54) is arranged on the outer side of the limiting plate (c 51).

8. A numerically controlled lathe and method of use as claimed in any one of claims 1 to 7 wherein:

when the disc parts need to be machined, the fan-shaped disc parts (30) are placed at the upper end of the workbench (3), the arc top (301) is clamped in one clamping structure (323), and the inclined edges (302) at two sides are limited between the other two clamping structures (323);

the small bevel gear (324) can be rotated to be meshed with the large bevel gear (321), the movable seat (322) at the upper end and the clamping structure (323) are driven to approach to the inner side, the sliding groove (23b) at the outer side of the fixed block (23a) slides on the inner side of the chuck (31) to clamp the sector disc part (30), then the fixed block (23a) drives the fixture block (23c) to abut against the arc top (301) and the bevel edge (302) at the outer side of the sector disc part (30), when the fixture block (23c) touches the arc top (301), the arc top (301) enters the inner side of the fixture block (23c) along the arc groove (3c4), and the bevel edges (302) at two sides abut against the inner side of the limiting structure (3c 5);

at the moment, the fixture block (23c) continuously moves inwards, so that the friction plate (c54) on the outer side of the limiting plate (c51) is close to and abuts against the inclined edge (302), the movable plate (c52) rotates around the movable shaft (c53) according to the clamping force, and finally the limiting plate (c51) completely abuts against the inclined edge (302), so that the fan-shaped disc part (30) is completely limited, the fan-shaped disc part (30) can be machined, and after the machining is completed, the bevel pinion (324) is loosened, so that the clamping structure (323) is far away from the fan-shaped disc part (30) to remove the limitation.

Technical Field

The invention belongs to the field of lathes, and particularly relates to a numerical control lathe and a using method thereof.

Background

The numerical control lathe is the most widely used numerical control machine tool at present, mainly processes shaft parts and disc parts, and the numerical control lathe automatically processes the parts according to a processing program which is programmed in advance, most of the existing numerical control lathes are horizontal, the occupied area is large, and the disc parts are processed, the disassembly and the assembly are inconvenient, so that the vertical multi-spindle numerical control lathe is derived, the disc parts can be processed conveniently, the occupied area is also reduced, but the prior art has the following defects:

because the dish type part is various, and present chuck is only applicable to the clamping of circular dish type part, when carrying out the clamping to fan-shaped dish type part, because fan-shaped dish type part periphery comprises sharp and pitch arc, causes the skew of dish type part when adding man-hour easily, and then makes the processing position of part change, influences the machining precision of part.

Therefore, the application provides a numerical control lathe and a using method thereof, and the defects are improved.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a numerically controlled lathe and a using method thereof, and aims to solve the problems that in the prior art, due to the fact that disc parts are various, the existing chuck is only suitable for clamping circular disc parts, when the fan-shaped disc parts are clamped, the periphery of the fan-shaped disc parts is composed of straight lines and arc lines, the disc parts are prone to being deviated during machining, the machining positions of the parts are changed, and machining precision of the parts is affected.

In order to achieve the purpose, the invention is realized by the following technical scheme: a numerical control lathe and a using method thereof structurally comprise a foot rest, a case, a workbench, a longitudinal moving frame, a processing seat, a transverse moving frame and a supporting column, wherein the foot rest is vertically arranged at the lower end of the case and welded with the case, the workbench is horizontally arranged at the upper end of the case and mechanically connected with the case, the longitudinal moving frame is vertically arranged at the upper end of the case and welded with the case, the transverse moving frame is horizontally arranged on the front surface of the longitudinal moving frame and movably connected with the longitudinal moving frame, the processing seat is arranged at the front end of the transverse moving frame and mechanically connected with the transverse moving frame, and the supporting column is fixed between the longitudinal moving frames and connected; the workbench comprises a chuck, clamping jaws and an inner groove, wherein the inner groove is formed in the inner side of the chuck and is of an integrated structure, the chuck is embedded into the inner groove and is installed on the outer side of the chuck, and the clamping jaws are three and distributed in an annular mode.

The jaw is further improved, the jaw comprises a large bevel gear, a moving seat, a clamping structure and a small bevel gear, the moving seat is arranged at the upper end of the large bevel gear and meshed with the moving seat, the clamping structure is horizontally arranged at the upper end of the moving seat and welded with the moving seat, and the small bevel gear penetrates through a chuck and is meshed with the lower end of the large bevel gear.

The clamping structure is further improved, the clamping structure comprises a fixing block, a sliding groove and a clamping block, the sliding groove is arranged on the outer side surface of the fixing block and is of an integrated structure, and the clamping block is embedded and installed on the inner side of the fixing block.

The invention is further improved, a rotating shaft penetrates through the inner side of the clamping block, the rotating shaft is embedded and installed at the left end of the inner side of the fixing block, and the moving angle between the clamping block and the fixing block is minus degree.

The invention is further improved, the two sides of the clamping block are provided with auxiliary blocks, the outer sides of the auxiliary blocks extend to the side surfaces of the clamping block in an arc shape, the left sides of the auxiliary blocks are positioned on the same plane, and grooves are embedded in the auxiliary blocks.

The invention is further improved, the upper end of the fixture block is provided with a rim plate, and the rim plate is fixedly connected to the upper ends of the fixture block and the auxiliary block and welded with the fixture block and the auxiliary block.

The invention is further improved, the inner side of the left end of the fixture block is provided with an arc groove and two limiting structures which are symmetrical to each other, and the limiting structures are obliquely distributed on the inner side of the arc groove.

The invention is further improved, the limiting structure comprises a limiting plate, a movable shaft and a friction plate, the movable plate is fixed at the rear end of the limiting plate and welded with the rear end of the limiting plate, the movable shaft penetrates through the inner side of the movable plate and is movably connected with the movable shaft, and the friction plate is arranged on the outer side of the limiting plate and is of an integrated structure.

According to the technical scheme, the numerical control lathe and the using method have the following beneficial effects:

the clamping block is arranged on the left side of the fixing block, the fixing block drives the clamping block to abut against the arc top and the bevel edge on the outer side of the fan-shaped disc part, when the clamping block touches the bevel edge, the clamping block rotates around the rotating shaft and is always attached to the bevel edge, when the clamping block rotates upwards or downwards around the rotating shaft, the clamping block is clamped and cannot rotate continuously, the contact area between the auxiliary block and the bevel edge is increased, the freedom degree of the auxiliary block is further limited by the edge plate at the upper end, the disc part is prevented from being deviated during processing, and the processing precision of the part is improved.

According to the invention, the limiting structure is arranged on the inner side of the clamping block, the fixing block drives the clamping block to abut against the arc top and the bevel edge on the outer side of the fan-shaped disc part, when the clamping block touches the arc top, the arc top enters the inner side of the clamping block along the arc groove, the bevel edges on two sides abut against the inner side of the limiting structure, at the moment, the clamping block moves towards the inner side continuously, the friction plate on the outer side of the limiting plate is enabled to approach and abut against the bevel edge, the movable plate rotates around the movable shaft according to the clamping force, and finally, the limiting plate completely abuts against the bevel edge to limit, so that the fan-shaped disc part is better clamped, the deviation of the fan-shaped disc part in the machining process is prevented, the machining.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic structural view of a numerically controlled lathe and a method of use according to the present invention;

FIG. 2 is a schematic structural diagram of a workbench according to the present invention;

FIG. 3 is a schematic side view of the worktable according to the present invention;

FIG. 4 is a schematic structural view of a clamping structure of the present invention;

FIG. 5 is a schematic view of a fitting structure of the fixing block and the fixture block according to the present invention;

FIG. 6 is a schematic top view of a fixture block according to a first aspect of the present invention;

FIG. 7 is a side view of the fixture block according to the present invention;

FIG. 8 is a diagram illustrating a second example of a fixture block according to the present invention;

FIG. 9 is a schematic structural view of a position limiting structure according to the present invention;

fig. 10 is a schematic structural view of a sector-shaped disc part to be processed according to the present invention.

In the figure: the device comprises a foot stand-1, a case-2, a workbench-3, a longitudinal moving frame-4, a processing seat-5, a transverse moving frame-6, a supporting column-7, a chuck-31, a jaw-32, an inner groove-33, a large bevel gear-321, a moving seat-322, a clamping structure-323, a small bevel gear-324, a fixed block-23 a, a chute-23 b, a fixture block-23 c, a rotating shaft-3 c1, an auxiliary block-3 c2, a following plate-3 c3, an arc groove-3 c4, a limiting structure-3 c5, a limiting plate-c 51, a movable plate-c 52, a movable shaft-c 53, a friction plate-c 54, a sector disc part-30, an arc top-301 and a bevel edge-302.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

The first embodiment is as follows: referring to fig. 1-7 and 10, the embodiment of the present invention is as follows:

the structure of the device comprises a foot rest 1, a case 2, a workbench 3, a longitudinal moving frame 4, a processing seat 5, a transverse moving frame 6 and a support column 7, wherein the foot rest 1 is vertically arranged at the lower end of the case 2 and welded with the lower end of the case, the workbench 3 is horizontally arranged at the upper end of the case 2 and mechanically connected with the upper end of the case, the longitudinal moving frame 4 is vertically arranged at the upper end of the case 2 and welded with the upper end of the case, the transverse moving frame 6 is horizontally arranged at the front side of the longitudinal moving frame 4 and movably connected with the longitudinal moving frame, the processing seat 5 is arranged at the front end of the transverse moving frame 6 and mechanically connected with the transverse moving; the worktable 3 comprises a chuck 31, a plurality of jaws 32 and inner grooves 33, wherein the inner grooves 33 are arranged inside the chuck 31 and are of an integrated structure, the chuck 31 is embedded in the inner grooves 33 and is arranged outside the chuck 31, and the jaws 32 are three and distributed in a ring shape.

Referring to fig. 3, the jaw 32 includes a large bevel gear 321, a movable base 322, a clamping structure 323, and a small bevel gear 324, the movable base 322 is disposed at an upper end of the large bevel gear 321 and is engaged with the large bevel gear 321, the clamping structure 323 is horizontally mounted at an upper end of the movable base 322 and is welded to the movable base, the small bevel gear 324 penetrates through the chuck 31 and is engaged with a lower end of the large bevel gear 321, and the small bevel gear 324 is engaged with the large bevel gear 321 to movably clamp the clamping structure 323 at the upper end of the movable base 322.

Referring to fig. 4 to 5, the clamping structure 323 includes a fixed block 23a, a sliding groove 23b, and a latch 23c, where the sliding groove 23b is disposed on an outer surface of the fixed block 23a and is an integrated structure, the latch 23c is embedded in the fixed block 23a, and the latch 23c fixes the sector plate-like component 30.

Referring to fig. 4 to 5, a rotating shaft 3c1 penetrates through the inner side of the latch 23c, the rotating shaft 3c1 is embedded in the left end of the inner side of the fixed block 23a, the moving angle between the latch 23c and the fixed block 23a is 0 to 60 degrees, and the latch 23c can rotate around the rotating shaft 3c1 according to the inclined edge 302 of the fan-shaped disc part 30, so that the latch completely fits the inclined edge 302 of the fan-shaped disc part 30, and can stop rotating when clamped to a certain degree, so as to be completely fixed.

Referring to fig. 5-6, the two sides of the latch 23c are provided with auxiliary blocks 3c2, the outer side of the auxiliary block 3c2 extends to the side of the latch 23c in an arc shape, and the left side is located on the same plane, a groove is embedded in the auxiliary block 3c2, when the latch 23c abuts against the inclined edge 302 of the fan-shaped disc-like element 30, the auxiliary block 3c2 will abut against the upper end together, and further prevent the latch from sliding continuously.

Referring to fig. 6-7, the upper end of the latch 23c is provided with a rim plate 3c3, the rim plate 3c3 is fixedly connected to the upper ends of the latch 23c and the auxiliary block 3c2 and is welded, and when the fixation of the inclined edge 302 is completed, the sector plate-like member 30 is further defined along the plate 3c 3.

Based on the above embodiment, the specific working principle is as follows:

when the disc parts need to be machined, the fan-shaped disc parts 30 are placed on the upper end of the workbench 3, the arc top 301 is clamped on one clamping structure 323, the bevel edges 302 at two sides are limited between the other two clamping structures 323, namely, the bevel pinion 324 can be rotated to engage with the bevel pinion 321, at this time, the moving seat 322 at the upper end and the clamping structure 323 are driven to approach to the inner side, the sliding groove 23b at the outer side of the fixing block 23a slides on the inner side of the chuck 31 to clamp the fan-shaped disc parts 30, then the fixing block 23a drives the fixture block 23c to abut against the arc top 301 and the bevel edge 302 at the outer side of the fan-shaped disc parts 30, when the bevel edge 302 is touched, the fixture block 23c rotates around the rotating shaft 3c1 to be always attached to the bevel edge 302, when the fixture block 23c rotates upwards or downwards around the rotating shaft 3c1 by 30 degrees, the fixture block is clamped and cannot rotate continuously, and the auxiliary block 3c2 also increases the, the upper edge plate 3c3 further defines the degree of freedom, and the latch 23c completely restricts the disc segment 30, i.e. the longitudinal moving frame 4 and the transverse moving frame 6 are operated to allow the machining base 5 to machine the disc segment 30, and after machining is completed, the bevel pinion 324 is released to allow the clamping structure 323 to release the disc segment 30, so as to remove the disc segment 30.

Example two: referring to fig. 1-5 and 8-10, the embodiments of the present invention are as follows:

the structure of the device comprises a foot rest 1, a case 2, a workbench 3, a longitudinal moving frame 4, a processing seat 5, a transverse moving frame 6 and a support column 7, wherein the foot rest 1 is vertically arranged at the lower end of the case 2 and welded with the lower end of the case, the workbench 3 is horizontally arranged at the upper end of the case 2 and mechanically connected with the upper end of the case, the longitudinal moving frame 4 is vertically arranged at the upper end of the case 2 and welded with the upper end of the case, the transverse moving frame 6 is horizontally arranged at the front side of the longitudinal moving frame 4 and movably connected with the longitudinal moving frame, the processing seat 5 is arranged at the front end of the transverse moving frame 6 and mechanically connected with the transverse moving; the worktable 3 comprises a chuck 31, a plurality of jaws 32 and inner grooves 33, wherein the inner grooves 33 are arranged inside the chuck 31 and are of an integrated structure, the chuck 31 is embedded in the inner grooves 33 and is arranged outside the chuck 31, and the jaws 32 are three and distributed in a ring shape.

Referring to fig. 3, the jaw 32 includes a large bevel gear 321, a movable base 322, a clamping structure 323, and a small bevel gear 324, the movable base 322 is disposed at an upper end of the large bevel gear 321 and is engaged with the large bevel gear 321, the clamping structure 323 is horizontally mounted at an upper end of the movable base 322 and is welded to the movable base, the small bevel gear 324 penetrates through the chuck 31 and is engaged with a lower end of the large bevel gear 321, and the small bevel gear 324 is engaged with the large bevel gear 321 to movably clamp the clamping structure 323 at the upper end of the movable base 322.

Referring to fig. 4 to 5, the clamping structure 323 includes a fixed block 23a, a sliding groove 23b, and a latch 23c, where the sliding groove 23b is disposed on an outer surface of the fixed block 23a and is an integrated structure, the latch 23c is embedded in the fixed block 23a, and the latch 23c fixes the sector plate-like component 30.

Referring to fig. 8, the inner side of the left end of the latch 23c is provided with an arc groove 3c4 and a limiting structure 3c5 located at the inner side, the limiting structures 3c5 are provided with two and symmetrical to each other, the limiting structures 3c5 are obliquely distributed at the inner side of the arc groove 3c4, and the arc top 301 can extend into the inner side of the arc groove 3c4, so that the inclined edges 302 at the two ends are limited to the limiting structure 3c5 to prevent the limiting structure from continuously sliding.

Referring to fig. 9, the limiting structure 3c5 includes a limiting plate c51, a movable plate c52, a movable shaft c53, and a friction plate c54, the movable plate c52 is fixed to and welded to the rear end of the limiting plate c51, the movable shaft c53 penetrates through the inner side of the movable plate c52 and is movably connected to the inner side of the movable plate c52, the friction plate c54 is disposed on the outer side of the limiting plate c51 and is an integrated structure, the limiting plate c51 enables the movable plate c52 to rotate at the upper end of the movable shaft c53 according to the inclined edge 302, and the limiting plate c51 can be completely attached to the inclined edge 302 for better.

Based on the above embodiment, the specific working principle is as follows:

when the disc parts need to be machined, the fan-shaped disc part 30 is placed at the upper end of the workbench 3, the arc top 301 is clamped on one clamping structure 323, the bevel edges 302 at two sides are limited between the other two clamping structures 323, the small bevel gear 324 can be rotated to be meshed with the large bevel gear 321, the moving seat 322 at the upper end and the clamping structure 323 are driven to approach inwards, the sliding groove 23b at the outer side of the fixed block 23a slides on the inner side of the chuck 31 to clamp the fan-shaped disc part 30, then the fixed block 23a drives the fixture block 23c to abut against the arc top 301 and the bevel edge 302 at the outer side of the fan-shaped disc part 30, when the fixture block 23c touches the arc top 301, the arc top 301 enters the inner side of the fixture block 23c along the arc groove 3c4, the bevel edges 302 at two sides abut against the inner side of the limiting structure 3c5, and the friction plate c54 at the outer side of the limiting plate c51 approaches and abuts against the bevel edge 302 along with the continuous inward movement, and the movable plate c52 rotates around the movable shaft c53 according to the clamping force, and finally the limiting plate c51 completely abuts against the inclined edge 302, so that the sector-shaped disc-like part 30 is completely limited, the sector-shaped disc-like part 30 can be machined, and after the machining is finished, the small bevel gear 324 is loosened, so that the clamping structure 323 is far away from the sector-shaped disc-like part 30, and the limitation is removed.

The invention solves the problems that the prior chuck is only suitable for clamping circular disc parts and the machining position of the parts is easy to shift when machining due to the fact that the periphery of the sector disc parts consists of straight lines and arc lines when the sector disc parts are clamped, and the machining precision of the parts is influenced, the invention arranges a fixture block on the left side of the fixture block through the mutual combination of the parts, the fixture block drives the fixture block to abut against the arc top and the bevel edge on the outer side of the sector disc parts, when the bevel edge is touched, the fixture block rotates around a rotating shaft and is always attached to the bevel edge, when the fixture block rotates upwards or downwards around the rotating shaft, the fixture block is clamped and cannot rotate continuously, the auxiliary block also increases the contact area with the bevel edge, and the freedom degree of the auxiliary block at the upper end is further limited by the edge plate at the upper end, the offset of disc parts during processing is prevented, and the processing precision of the parts is improved; limiting structure has been set up in the fixture block inboard, the fixed block will drive the fixture block and support arc top and the hypotenuse in the fan-shaped dish class part outside, when the fixture block touches the arc top, the arc top will get into the fixture block inboard along the arc groove, the hypotenuse of both sides will support at limiting structure inboard, constantly inboard removal along with the fixture block this moment, and the friction plate that makes the limiting plate outside is close to and supports at the hypotenuse, and make the fly leaf rotatory round the loose axle according to the dynamics of pressing from both sides, it will restrict at the hypotenuse to support completely to last limiting plate, better carry out the clamping to fan-shaped dish class part, prevent that it from causing the skew in processing, make the position accuracy more of processing, thereby the machining precision has been.

While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.