CN208880484U - A kind of bistrique drive mechanism of polishing machine - Google Patents

Abstract

The utility model discloses a kind of bistrique drive mechanism of polishing machine, includes mounting plate and uniformly fixed multiple grinding head assemblies on a mounting board, mounting plate top are equipped with the bistrique gear for covering and transmission shaft being driven to rotate on transmission shaft；Side is equipped with bistrique spinning motor on a mounting board, transmission gear is equipped with below bistrique spinning motor, the first attachment base is equipped on the center of the mounting plate, inner pedestal is connected on first attachment base, inner pedestal is externally provided with outer bearing carrier, second gear and first gear are respectively equipped in outer bearing carrier upper and lower ends, the first gear is meshed with four bistrique gears of four grinding head assemblies respectively, and the second gear is meshed with transmission gear.Driving force is assigned on four bistriques by the star-like wheel construction that a bistrique spinning motor drives multiple gears to constitute, instead of the structure of the corresponding bistrique of a traditional motor, improves transmission efficiency height.

Description

A kind of bistrique drive mechanism of polishing machine

Technical field

The utility model relates to arrive medal polish technical field, especially a kind of bistrique drive mechanism.

Background technique

The course of work of the polishing machine to stainless steel polishing are as follows: stainless steel plate comes out from steel, there are two kinds of burnishing surface situations, One is 25~63 roughness, surface is the wire-drawing surface of matt, the second is just carrying out rough polishing in steel mill, roughness reaches 1.6 Between~3.2, referred to as 2B plate, surface are not matts, have light.It is by stainless steel surface by the purpose that polishing machine polishes It is polished to 8K mirror surface；We will reach 8k plate (as 0.1~0.4 roughness), and so-called 8K plate is the one of stainless steel surface Determine the lines seen on area how many, reach the degree of mirror board.

Tradition has a mode manually polished, man-hour manually hand-held formula angle grinder, and manpower is thrown, it is clear that by manually dishing out come precision and Stability all can be poor, influences homogeneity of product, and in artificial polishing process, stainless steel surface can generate dust and metal Bits generate biggish harm to the health of operator.

Traditional also mechanically polishes, and movement is had any different, and mobile mode is to move left and right；The metal ground when polishing Bits, abrasive material particle be not discharged well, have these residues in working region so that when being polished to stainless steel plate be easy Secondary abrasion and injury are caused in plate face；And be that one group of bistrique is driven by 4 motors, each 2.2~3kw of motor, a mill The corresponding motor of head, energy consumption is high, and is easy there are failure, and maintenance cost is high；On the other hand traditional motor is arranged at work Make in region, have in moist acid environment, be easily damaged, electrical fault rate is high；And the transmission side of traditional mechanical polishing Formula is belt pulley and belt completes transmission, the low efficiency of belt transmitting, and skid overload, stuck, loss workmanship are easy after elongating Low efficiency, energy consumption is high, and very powerful motor is needed to realize polishing, and energy consumption is high, causes transmission efficiency low.

Utility model content

The purpose of the utility model is to overcome the low technologies of the kind of drive transmission efficiency of prior art mechanical polishing to ask Topic provides and a kind of form star-like wheel construction by a motor and gear set and can drive the bistrique transmission knot of one group of bistrique work Structure.

In order to achieve the above object, the utility model takes technical solution below: a kind of bistrique transmission knot of polishing machine Structure, for driving grinding head assembly to rotate, the rotation of grinding head assembly includes the rotation of bistrique and the revolution of grinding head assembly itself, institute It states grinding head assembly uniformly to fix on a mounting board and be respectively classified into two parts up and down by it, is working region below mounting plate；Often A grinding head assembly includes transmission shaft moving up and down and is located at the bistrique that working region is driven by transmission shaft；Above mounting plate Equipped with cover can be driven on transmission shaft transmission shaft rotate bistrique gear；Side is equipped with bistrique spinning motor, bistrique on a mounting board It is equipped with transmission gear below spinning motor, further includes having the shaft coupling for being separately connected bistrique spinning motor output shaft and driving gearshaft Device is equipped with the first attachment base on the center of the mounting plate, is connected with inner pedestal, inner pedestal on the first attachment base It is externally provided with outer bearing carrier, second gear and first gear, the first gear point are respectively equipped in outer bearing carrier upper and lower ends It is not meshed with the bistrique gear of multiple grinding head assemblies, the second gear is meshed with transmission gear；It further include wearing inner shaft Hold an axis and lower end is connected in the first attachment base can drive the first attachment base rotate main shaft, main shaft expose inner pedestal Upper end be cased with the spiral bevel gear that can drive main axis.Multiple gears are driven to constitute by a bistrique spinning motor star-like Driving force is assigned on multiple bistriques by wheel construction, instead of the knot of the corresponding bistrique of a traditional bistrique spinning motor Structure improves transmission efficiency height, while passing through the continuous action relation of main shaft and mounting plate, realizes whole turn of multiple grinding head assemblies It is dynamic, the rotation of bistrique and the revolution of grinding head assembly are combined, efficiency and the region of bistrique grinding stainless steel are more effectively improved； Working region and operating area are kept apart using mounting plate simultaneously, traditional bistrique spinning motor that will control is solved and is placed on work Make the problem of electrical machinery life caused by region reduces damage, also improves service life and the control precision of motor.

Further include the second holding screw, passes through first one side of the connector and be resisted against on main shaft.Holding screw On the one hand setting facilitates main shaft that the first attachment base is driven to rotate together, so that mounting plate be driven to rotate together, ultimately form four A bistrique rotates together, and ultimately forms the revolution of star-like wheel construction, on the other hand, can be with when needing to adjust main spindle's Holding screw is unscrewed, operation is facilitated.

If the lower surface of bistrique is working face, upper surface is mounting surface, and the grinding head assembly further includes being located at bistrique installation Bistrique fixation kit on face is installed with fixing seat on bistrique fixation kit, and the second attachment base, the second connection are set above fixing seat Seat is equipped with bistrique bearing block, and bistrique bearing block is fixed on above mounting plate, and the bistrique gear is located above bistrique bearing block, The transmission shaft is successively worn from bistrique gear, bistrique bearing block, the second attachment base, fixing seat, bistrique fixation kit center, institute State the second attachment base and passed through along bistrique bearing block and connect with bistrique gear lower end, inside the second attachment base, bistrique gear lower section, It is surrounded by longitudinal annular compression chamber outside transmission shaft, there are mechanical compression springs in compression chamber, around driving sleeve, around biography Moving axis is equipped with boss into compression chamber, and the mechanical compression springs upper and lower ends are born against in bistrique gear lower end and boss On.For being compensated to bistrique grinding force.Bistrique needs grinding force constant during carrying out abrasive dust to stainless steel plate, It is required that dynamics is controllable in a certain range, the uniformity and smoothness of stainless steel surface just can guarantee, and the bistrique grinding time is long After, bistrique is prone to wear, and causes the bistrique thickness thinning, so that bistrique is at a distance from stainless steel contact and grinding force occurs Adequately pressure contact cannot occur with stainless steel, cause grinding force not enough and uneven, eventually lead to stainless steel for variation, bistrique The polishing of plate is uneven, not smooth enough, pre-provisioning request is not achieved, and influence bistrique service life, this programme can pass through elastic shape The compression of change adapts to bistrique thickness slight change.

The first flat key contacted with transmission shaft end portion is equipped on the inside of fixing seat, in transmission shaft upper end and bistrique gear The part of contact is equipped with the second flat key.Driven by the transmitting of the power of two flat keys, when bistrique gear being facilitated to rotate transmission shaft with And fixing seat rotates together, transmission shaft can also be moved up and down along flat key position.

Further include the first holding screw, passes through the fixing seat one side and be resisted against on transmission shaft.Holding screw is set It sets and on the one hand facilitates transmission shaft that fixing seat is driven to rotate together, carry out autobiography eventually by bistrique fixation kit band rotary bistrique, separately On the one hand, when needing to adjust transmission shaft position, holding screw can be unscrewed, facilitates operation.

Perforative location hole is offered among the bistrique, is bonded with installation part on the mounting surface of bistrique；Along bistrique The consistent a plurality of circular arc grooving in circular arc radian direction is uniformly provided on working face, along bistrique working face edge to location hole Edge is uniformly provided with the consistent a plurality of circular arc grooving of circular arc bending direction, form two circular arcs of circular arc grooving the center of circle be with Positioning holes center is that 360 degree of equal parts of rotation center are arranged on working face.When bistrique works, the production when being ground to stainless steel Raw metal fillings can be got rid of by the centrifugal force of circular arc grooving and be dropped out, and reduce the metal fillings residual on bistrique working face, effectively It ensure that bistrique to the constant of stainless steel surface grinding force, reduces the secondary damage to stainless steel surface, decrease transmission The out of order probability of mechanism, the circular arc grooving being evenly arranged also ensure the balance of bistrique rotatory force, keep the steady of bistrique work It is qualitative.

The utility model compared with prior art, has the advantages that

1, driving force is assigned to by four bistriques by the star-like wheel construction that a bistrique spinning motor and gear are constituted On, the structure of a bistrique is corresponded to instead of a traditional motor, while the rotation of bistrique and bistrique being surrounded to the public affairs of main shaft Turn to combine to carry out grinding work to stainless steel, has grinding range big, be ground the feature of uniform synchronization, improve transmission Efficiency；In addition control complete machine very well further can be fed back using signal by the output of the constant speed, permanent torque of bistrique spinning motor Energy consumption；

2, working region and operating area are kept apart using mounting plate, so that bistrique spinning motor is placed in working region Outside, departing from moist acid environment, the service life of bistrique spinning motor is improved；

3, when the rotary bistrique work of bistrique gear rotation band, a pretightning force can be provided to bistrique using mechanical spring structure, It, can be between bistrique and stainless steel due to the elastic deformation of spring-compressed after bistrique is thinning due to long-time grinding thichness The automatic compensation of contact distance, guarantees the distance between bistrique and workbench substantially constant, ensure bistrique working face and stainless steel it Between come into full contact with, so that bistrique is kept a more constant grinding force at work, pass through mechanical spring after bistrique abrasion Elastic compression automatic compensation, can ensure bistrique grinding when steady and impaction state, reduce bistrique wear bring product Unstability improves the consistency of product.

Detailed description of the invention

Fig. 1 is the utility model bistrique drive mechanism cross-sectional view；

Fig. 2 is the perspective view of Fig. 1；

Fig. 3 is a grinding head assembly cross-sectional view in Fig. 1；

Fig. 4 is the perspective view of Fig. 3；

Fig. 5 is bistrique stereoscopic schematic diagram；

Fig. 6 is the top view of Fig. 5；

Fig. 7 is the side sectional view of Fig. 5.

Specific embodiment

The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that described herein Specific embodiment be used only for explaining the utility model, rather than the restriction to the utility model.It also should be noted that For ease of description, part relevant to the utility model is illustrated only in attached drawing rather than full content.

Embodiment:

It please refers to shown in Fig. 1 and Fig. 2, a kind of bistrique drive mechanism of polishing machine, for driving four grinding head assembly rotations, The rotation of four grinding head assemblies respectively includes the rotation of bistrique and the revolution of bistrique comprising has mounting plate 10 and uniformly consolidates It is scheduled on mounting plate 10 and two-part four grinding head assemblies up and down, four uniform cloth of grinding head assembly is respectively classified by mounting plate 10 It sets in the surrounding of mounting plate 10, is working region below mounting plate 10；Each grinding head assembly includes transmission moving up and down Axis 6 and it is located at the bistrique 1 that working region is driven by transmission shaft 6；It is equipped with to cover above mounting plate 10 and can drive biography on transmission shaft 6 The bistrique gear 8 that moving axis 6 rotates；Bistrique spinning motor 30 is equipped with above mounting plate 10, bistrique spinning motor 30 is fixed on mill On head spinning motor support base 31, it is connected with small bearing bracket 34 under bistrique spinning motor support base 31, on the small bearing bracket 34 It is connected with transmission gear 33, further includes having the shaft coupling for being separately connected 33 axis of 30 output shaft of bistrique spinning motor and transmission gear 32, the benefit of shaft coupling 32 be can by different institutions driving shaft and driven shaft link up rotate together with securely, and pass Pass movement and torque；It is upper between the center of mounting plate 10, four grinding head assemblies to be equipped with the first attachment base 35, the first connection It is connected with inner pedestal 36 on seat 35, inner pedestal 36 is externally provided with outer bearing carrier 37, in 37 upper and lower ends of outer bearing carrier respectively Equipped with second gear 372 and first gear 371, first gear 371 is meshed with four bistriques 1 of four grinding head assemblies respectively, Second gear 372 is meshed with transmission gear 33；It further include main shaft 40, top connects rotary joint 42, and remaining part wears inner shaft The central axes of seat 36 are held, and lower end is extend into the first attachment base 35, is connected thereto, exposes the upper of inner pedestal 36 in main shaft 40 End cap has spiral bevel gear 41, and spiral bevel gear 41 can drive main shaft 40 to rotate under outer power drive, and final main shaft 40 is connected by lower end The first attachment base 35 connect rotates that mounting plate 10 is driven to rotate, and is the second tightening by setting in specific the present embodiment Screw 351 passes through 35 one side of the first attachment base and is resisted against realization drive the first attachment base 35 rotation on main shaft 4.

The star-like wheel transmission course of work of the present embodiment is as follows: bistrique spinning motor 30 drives transmission gear 33 to rotate, transmission Gear 33 drives second gear 372 to rotate, and the rotation of second gear 372 drives outer bearing carrier 37 to rotate on inner pedestal 36, from And first gear 371 is driven to rotate, the bistrique gear 8 of four grinding head assemblies is driven by first gear 371, to drive transmission Axis 6 rotates, and final band rotary bistrique 1 carries out rotation.

Further referring to shown in Fig. 3 to Fig. 5, a kind of grinding head assembly with floating compensation function is used to grind bistrique 1 It cuts power to compensate, bistrique 1 is made of wool felt, if the lower surface of bistrique 1 is working face, upper surface is mounting surface, is being installed It is connected with bistrique fixation kit 2 on face, fixing seat 3 is installed on bistrique fixation kit 2, the second attachment base is set above fixing seat 3 4, the second attachment base 4 is equipped with bistrique bearing block 5, and bistrique bearing block 5 is fixed on a mounting board, further include have it is moving up and down Transmission shaft 6, one end end are connected with rotary joint 7, and rotary joint 7 is for connecting external water source etc., and 6 remaining part of transmission shaft is successively It is worn from bistrique bearing block 5, the second attachment base 4, fixing seat 3,2 center of bistrique fixation kit, further includes being located at 5 top of bearing block And the bistrique gear 8 that transmission shaft 6 can be driven to rotate is set on transmission shaft 6, attachment base 4 passes through and bistrique tooth along bearing block 5 80 lower end of axle sleeve of wheel 8 is connected to form one serial verb construction, when bistrique gear 8 rotates, can drive 4 turns of the second attachment base It is dynamic, and bistrique bearing block 5 does not rotate then due to not having continuous action relation, inside the second attachment base 4,8 lower section of bistrique gear, is driven The annular compression chamber equipped with a longitudinal direction is enclosed outside axis 6, specifically, the compression chamber top is the lower end of sleeve block 81, surrounding is (such as axle sleeve 80 is extended to be connect with the second attachment base, can also be regarded as the outside of transmission shaft 6 and the side of the second attachment base 4 The side of axle sleeve 80), bottom end is the step 41 that the second attachment base 4 is contacted with transmission shaft 6；In compression chamber, around transmission Axis 6 is cased with mechanical compression springs 9, and boss 61,9 upper and lower ends of mechanical compression springs point are equipped with into compression chamber around transmission shaft 6 It is not resisted against on 81 lower end of sleeve block and boss 61 of bistrique gear 8, mechanical compression springs 9 can be sent out by the extruding of boss 61 Raw elastic deformation, forms a compressing force, can finally be applied on bistrique 1, is 8 lower end of bistrique gear at the top of the compression chamber (specifically 81 lower end of sleeve block of bistrique gear 8), bottom are the step 41 formed in the second attachment base 4, work as biography in this way When about 6 moving axis generates displacement, compensation bistrique 1 is formed come mechanical compression springs 9 by boss 61 and is lost since thickness is thinning Compressing force, transmission shaft 6, which moves down, drives fixing seat 3, bistrique fixation kit 2 and bistrique 1 to move down into table surface, so that convex Platform 61 moves down at step 41, and the compressive state A of as maximum compensation thickness drives fixing seat 3, bistrique when transmission shaft 6 moves up Fixation kit 2 and bistrique 1 also on when moving on to 3 top of fixing seat and resisting the second 4 bottom end of attachment base so that the also upper telephone-moving of boss 61 Tool compressed spring 9 simultaneously rests on B location, and as minimum compensation thickness is equipped with and 6 end portion of transmission shaft on the inside of fixing seat 3 First flat key 100 of contact is equipped with the second flat key 23 in the part that 6 upper end of transmission shaft is contacted with bistrique gear 8, passes through two The transmitting of the power of flat key drives transmission shaft and fixing seat to rotate together when gear being facilitated to rotate, and transmission shaft can also be along flat key It moves up and down；In the present embodiment, pass through connecting screw 20 and hex bolts 21 between fixing seat 3 and bistrique fixation kit 2 Connection.

The grinding course of work of the present embodiment bistrique is as follows: transmission shaft 6 drives fixing seat 3, bistrique fixation kit 2 and mill First 1 moves down into table surface, and bistrique gear 8 is rotated by external force, due to the setting of the second flat key 23, drives transmission Axis 6 rotates together, simultaneously because the setting of the first flat key 100, the attachment base 4 being connect with bistrique gear 8, by the first clamp screw Nail 22 is resisted against the fixing seat 3 on transmission shaft 6, and the bistrique fixation kit 2 affixed with fixing seat 3 rotates together, final to drive mill First 1 carries out grinding action on stainless steel.

As follows for the floating compensation course of work of bistrique: the lower end of the mechanical compression springs 9 in Fig. 3 compression chamber is in Dotted line B location, transmission shaft 6 drives fixing seat 3 to move up and has abutted to the second attachment base 4 by the first holding screw 22 at this time Lowest positions cannot move up again, and simultaneously, boss 61 has also driven and has moved on to most compressed state on spring 9, therefore, position B is the most compressed state of mechanical compression springs 9, and corresponding location A is the minimal compression of mechanical compression springs 9； Grinding work starts, and transmission shaft 6, which moves down, at this time drives fixing seat 3, bistrique fixation kit 2 and the entire mechanism of bistrique 1 to move down into work Make platform, when bistrique 1 is not worn, bistrique 1 is closely contacted with stainless steel at this time, grinding force is not lost, without being mended It repays, is worn after bistrique 1 works long hours, thickness is thinning, then transmission shaft 6 is understood under the elastic force of mechanical compression springs 9, Displacement is generated downwards, promotes transmission shaft 6 that fixing seat 3, bistrique fixation kit 2 is driven to move down bistrique 1, to the thickness of bistrique 1 The grinding force for spending thinning generation, which becomes smaller, carries out pressure compensation, and wherein the location A in Fig. 3 is maximum compensation thickness, when boss 61 It constantly moves down after finally falling on the step 41 of the second attachment base 4, illustrates that mechanical compression springs 9 have stretched maximum distance, for mill First 1 thickness loss has carried out maximum compensation.

Further, as shown in Fig. 5 to Fig. 7, the present embodiment is as follows using the specific structure of bistrique 1: bistrique 1 is by wool Felt is at bistrique is compressed integrally by wool felt integral high pressure, and perforative location hole 11, the positioning are offered among bistrique 1 Hole combines locating piece to can be used for positioning to bistrique, and the mounting surface of bistrique 1 is sticked on installation part 12 by epoxy resin glue, pacifies Settable velcro on the another side of piece installing 12, may be implemented the Fast Installation of bistrique；Along bistrique 1 working face edge to 11 edge of location hole is uniformly provided with the consistent a plurality of circular arc grooving 13 of circular arc bending direction, forms two of circular arc grooving 13 The center of circle of circular arc is to be arranged on working face by 360 degree of equal parts of rotation center of 5 center of location hole.

In the present embodiment, four circular arc groovings 13 are offered, are corresponding with eight circular arcs, the center of circle of eight circular arcs is with fixed The center in position hole 11 is the quartering that rotation center has carried out 360 degree.The groove depth of circular arc grooving 13 is set as 7.5mm, every circle The X-axis eccentricity at the center of circle of arc to 11 center of location hole is 14.5mm, and Y-axis eccentricity is 59.5mm, composition circular arc grooving 4 The radius of two circular arcs is respectively 77.5mm and 87.5mm.In the present embodiment, the center of circle of two circular arcs of each circular arc grooving 13 It falls on a circular arc of adjacent circular arc grooving 13.

Above-listed detailed description is illustrating for the utility model possible embodiments, and the embodiment is not to limit The scope of the patents of the utility model processed, all equivalence enforcements or change without departing from carried out by the utility model, is intended to be limited solely by this case The scope of the patents in.

Claims (7)

1. the bistrique drive mechanism of a kind of polishing machine, for driving grinding head assembly to rotate, it is characterised in that:

The grinding head assembly is uniformly fixed on mounting plate (10) and is respectively classified into two parts up and down, mounting plate (10) lower section by it For working region；

Each grinding head assembly includes transmission shaft moving up and down (6) and is located at the mill that working region is driven by transmission shaft (6) Head (1)；The bistrique gear (8) for covering and transmission shaft (6) being driven to rotate on transmission shaft (6) is equipped with above mounting plate (10)；

Bistrique spinning motor (30) are equipped with above mounting plate (10), axis is linked with transmission on bistrique spinning motor (30) output shaft Gear (33)；

It is fixed with the first attachment base (35), is connected on the first attachment base (35) interior on the center of the mounting plate (10) Bearing block (36), inner pedestal (36) are externally provided with outer bearing carrier (37), and is respectively equipped in outer bearing carrier (37) upper and lower ends Two gears (372) and first gear (371), the first gear (371) the bistrique tooth with each grinding head assembly of surrounding respectively Wheel (8) is meshed, and the second gear (372) is meshed with transmission gear (33)；It further include wearing inner pedestal (36) axis And lower end is connected to the main shaft (40) that the first attachment base (35) can be driven to rotate in the first attachment base (35), exposes in main shaft (40) The upper end of inner pedestal (36) is cased with the spiral bevel gear (41) that main shaft (40) can be driven to rotate.

2. the bistrique drive mechanism of polishing machine as described in claim 1, it is characterised in that: further include the second holding screw (351), the first attachment base (35) one side is passed through to be resisted against on main shaft (40).

3. the bistrique drive mechanism of polishing machine as described in claim 1, it is characterised in that: further include being separately connected bistrique certainly The shaft coupling (32) of rotating motor (30) output shaft and transmission gear (33) axis.

4. the bistrique drive mechanism of the polishing machine as described in claims 1 or 2 or 3, it is characterised in that: the grinding head assembly also wraps The bistrique fixation kit (2) being located on bistrique (1) mounting surface is included, is installed with fixing seat (3) on bistrique fixation kit (2), it is fixed It is set the second attachment base (4) above seat (3), the second attachment base (4) is equipped with bistrique bearing block (5), and bistrique bearing block (5) is fixed on Above mounting plate (10), the bistrique gear (8) is located above bistrique bearing block (5), and the transmission shaft (6) is successively from bistrique tooth Wheel (8), bistrique bearing block (5), the second attachment base (4), fixing seat (3), bistrique fixation kit (2) center are worn, and described second Attachment base (4) is passed through in bistrique bearing block (5) and is connect with bistrique gear (8) lower end, the second attachment base (4) inside, bistrique tooth It is surrounded by longitudinal annular compression chamber below wheel (8), outside transmission shaft (6), is covered in compression chamber, around transmission shaft (6) organic Tool compressed spring (9) is equipped with boss (61) into compression chamber around transmission shaft (6), mechanical compression springs (9) upper and lower ends It bears against on bistrique gear (8) lower end and boss (61).

5. the bistrique drive mechanism of polishing machine as claimed in claim 4, it is characterised in that: be equipped on the inside of the fixing seat (3) with The first flat key (100) of transmission shaft (6) end portion contact, sets in the part that transmission shaft (6) upper end is contacted with bistrique gear (8) There are the second flat key (23).

6. the bistrique drive mechanism of polishing machine as claimed in claim 5, it is characterised in that: further include the first holding screw (22), the fixing seat (3) one side is passed through to be resisted against on transmission shaft (6).

7. the bistrique drive mechanism of polishing machine as claimed in claim 6, it is characterised in that: opened up among the bistrique (1) There are perforative location hole (11)；The consistent a plurality of circular arc in circular arc radian direction is uniformly provided with along the working face of bistrique (1) to cut It is consistent more to location hole (11) edge to be uniformly provided with circular arc bending direction along the edge of the working face of bistrique (1) for slot (13) Circular arc grooving (13), the center of circle for forming two circular arcs of circular arc grooving (13) is using location hole (11) center as rotation center 360 degree of equal parts are arranged on working face.