The box of main shaft of modular machine tool of lesser axis span is designed

1 introductive modular machine tool is right poriferous auger cut treatment to have larger dominant position, distributinging position executes its coordinate by aperture to machine, assured the precision of coordinate position dimension of aperture. Regard modular machine tool as the main shaft box of special component, have mature and fixed design pattern: Axis of lid of side of main shaft casing of the standard, around, main shaft, transmission shaft, tine, bearing, and method of design of mature drive, layout, structure can be offerred choose. This is the advantage that design of modular machine tool produces. But, how to reach the requirement of group fittings according to workmanship technology, apply neatly on the design and innovate somewhat, machine the need of workpiece with suiting better, it is a task that is placed before personnel of design of our modular machine tool. Recently, the modular machine tool of YU02 vent-pipe connect that we design for company of Chongqing join forces had beneficial attempt, obtained better result. Connect of vent-pipe of YU02 of analysis of requirement of 2 workpiece treatment is by introduced Japan some machinery makes a blueprint paper undertake machining, it is the important part that is used at join engine and exhaust conduit, technical demand is higher. Diagram of this workpiece craft is shown 1 times like the graph. Graph material of workpiece of diagram of craft of 1 spare parts is hardness HB200 ～ the cast of 250, weight 350g, year production program is 200 thousand. Main treatment needs to finish: Milling two joint face (see a picture 1 in the triangular plane of contact and) of lumbar circle plane, get 3 via that cut triangular plane to go up 3, φ 6.

Two via on plane of circle of 5mm, waist 2, φ 8.

5mm. Analyse the treatment precision requirement of workpiece: To assure the assembly with final work function, besides assure to be in milling when two plane its position dimension 69.

4mm, assure dimension of two planar included angle 90 ° - outside 65 ° of 25 ° ＝ , getting when cutting treatment hole, the two aperture on plane of requirement waist circle are right 22 dimension of  of aperture of exhaust duct center are 46 ± 0.

25, 3 aperture on requirement triangle plane are right 22 dimension of  of aperture of exhaust duct center are 41 ± respectively 0.

25 reach 45 ± 0.

25. Distribution of plan of 3 modular machine tool designs the treatment requirement according to workpiece, we think to use modular machine tool to finish its mill at the same time, auger cut treatment relatively appropriate. Center efficient characteristic to develop modular machine tool to machine working procedure, we chose mill, get horizontal 3 labour plan of modular machine tool, if the overall program distribution of the machine tool pursues 2. Graph this modular machine tool used general drawing of 2 machine tools two milling head and two auger cut a head, decorate the two side of the slip of motivation of HY32- Ⅲ hydraulic pressure that is 630mm in working journey respectively, its follow a hydraulic pressure installation of automatic clamping apparatus is on slip mesa, by slip belt clamping apparatus and workpiece finish fore-and-aft and fast feed and milling job feed, send auger cut worker worker the bore that finish. When working slip belt clamping apparatus and workpiece pass two milling head compulsively to finish milling after treatment, dynamical slip sends clamping apparatus and workpiece speed auger cut worker worker, by decorate in two flank left, right on two HY250 slip auger cut a head to part to be opposite from both sides 5 aperture on triangular plane and lumbar circle plane are finished get the treatment that cut hole. 3 labour of the machine tool show fore-and-aft decorate: Ⅰ is versed in to assemble and unassemble workpiece is versed in, Ⅱ is versed in for milling working station, Ⅲ is versed in cut worker worker to get. Workpiece locates last time in the machine tool outfit clip, finish mill at the same time, auger cut treatment content, the coordinate dimension precision that is helpful for assuring workpiece plane included angle and positional dimension precision and each aperture. The manufacturing efficiency of the machine tool is tall, treatment quality is stable, the configuration type of its machine tool is equivalent to transfer matic of a small-sized modular machine tool. 4 auger cut design of box of much axis main shaft to be known by analysis of spare parts craft, getting key of the treatment that cut hole is the 3- φ that should assure triangular plane to go up 6.

The precision of the position in be opposite of 22 is φ of aperture of 5 pairs of centers ± 0.

25, the 2- φ on plane of the circle that reach a waist 8.

The precision of the position in be opposite of 22 is 5 pairs of centers ± 0.

25. Demand of precision of this one dimension is higher. We are analysed, if use belt getting pattern plate to direct means is finished at the same time,get cut treatment, criterion the positional precision ± between Kong Yukong 0.

25 easy implementation, the design is made also answer unchallenged. Difficulty is opposite at how assuring each aperture central aperture φ the in be opposite precision of 22. Classics and craft design sectional research, to assure the in be opposite precision of aperture, agree aperture auger cut treatment and to φ the Huo of 22 centers aperture cuts treatment to be finished at the same time. Getting so cut triangular plane to go up not only want a design to decorate 3 root getting to cut main shaft, and among still need to insert one Huo to cut main shaft, have 4 main shaft namely, its main shaft is the smallest axial span by the graph 1 know; Same, getting plane of the circle that cut a waist to go up not only want a design to decorate two root getting to cut main shaft, and among also need to insert one Huo to cut main shaft, share 3 main shaft, span of the smallest axis is its main shaft 23. By at present data of design of our country modular machine tool is recommended, use stagger needle bearing main shaft to arrange its span of the smallest axis is 24mm. And the design of main shaft box that is less than 24mm axis span, we count a design normally " forbidden zone " . To assure main shaft box lesser axial span is decorated, use needle bearing commonly. According to the report that visits to the user, this kind does not have the needle bearing of cage, the dependability in using a process is poor, easy generation is held in the arms axis and calorific, working stability is poorer. From main shaft box the design makes angle consider, φ of aperture of center of Huo bore with a reamer 22 remove from inside treatment of modular machine tool, in follow-up of modular machine tool treatment technical secondary school sets process of a Huo bore with a reamer. But, remove next modular machine tool to enrage orifice φ to the center the Huo bore with a reamer of 22, be hard to make sure after bore each are gotten cut aperture to be opposite central aperture φ ± of the 22 claimed accuracy in be opposite 0.

25; And should add a working procedure and Huo aperture equipment more, going against play to assure aperture concentration of working procedure of modular machine tool, easily is the advantage that machines positional precision. Accordingly, use branch holds to a requirement to be able to be finished at the same time on modular machine tool auger, Huo aperture treatment. The requirement that considers use section and cutting machine the effect, we decide to undertake when Kong Tong of choice getting, Huo. To make true opening of main shaft box the smallest axial span is 23mm, make sure reliable, job stabilizes the structure, we the design method according to our country modular machine tool, made be improved necessarily and innovate to structure of drive of main shaft box, in should designing plan to be used in actual production, endured examine, if the graph is shown 3 times,structure of drive of box of its main shaft is designed. Graph design of box of this main shaft has composition of a picture of knot of drive of box of 3 main shaft the following characteristic: (1) drive plan is compact. To structural drive comes true inside lesser space, reduce transmission line, main shaft of intermediate Huo bore with a reamer 1 make main shaft make transmission shaft again already, in back row drive two intermediate transmission shaft 5 with 6. When devising transmission plan commonly, get power to improve main shaft, unfavorable use main shaft to make transmission shaft, but, because we are,put drive in rear wall of main shaft box to be discharged finally, 1 front does not get main shaft of Huo bore with a reamer transmission force, and force of cutting of Huo bore with a reamer is relatively lesser. Accordingly, it is feasible that we think to adopt plan of this kind of drive. (2) to realize lesser axis span, we adopted bearing of will radial, axial to be taken stagger range way. To avert radial dimension interference, its main shaft 2, the journal bearing arrangement of 3 is before main shaft box, among rear wall. Such, what the bearing of its main shaft is apart from L and main shaft is dangerous the A that extend a capacity is dangerous extend reduce than L/a, can you affect main shaft be out of shape and machine precision? L/a ＝ is recommended when we consider to be designed in box of main shaft of tigidity of modular machine tool 1. 5 ～ 2, but as a result of structural reason, we use design of blame tigidity main shaft, the activity that machines precision to rely on main shaft front gets pattern plate fixed position to assure. Accordingly, take hang lesserly extend it is necessary that than be in this main shaft box is designed. (3) replaces needle bearing with radial ball bearing. To make axial span is reduced, the journal bearing on the tradition adopts needle bearing, in because be in,be being used actually, needle bearing character of service is not good, this feels embarrassed to design a section all the time. We consider to think, at present industry of domestic and international bearing is passed in recent years develop hard, had developed development to give bearing of high-powered construction of series exceeding essence of life, can satisfy the need of the machine tool. And in bore treatment, machine tool main shaft basically bears axial cutting force, its radial load is not big. We pass structures of pair of domestic and international bearing, function, price to compare, chose homebred 1000902 exceed ball bearing of light series radial, ＝ of D of its external diameter 28, width B ＝ 7, the structure is compact, character of service is good. (4) suffers in structural space below bounds circumstance, to raise the stiffness of main shaft, transmission shaft, take bigger external diameter as far as possible in structural admiral main shaft, transmission shaft. To prevent gear and main shaft diameter happening collides, we choose to get cutting the shaft of Huo bore with a reamer with relatively lesser force, mid take φ of diameter of axis of minor chance to extricateoneself from an awkward position 12, in order to had let the outline outside gear, diameter of axis of the others main shaft takes φ of standard main shaft 15, transmission shaft takes standard φ 20. (Box of 5) main shaft and headstock motivation are delivered take shaft coupling drive. Recommend by domestic data, set drive of connection of one class gear commonly, accept force and implementation drive plan for improvement, we draw lessons from foreign experience, take form of shaft coupling drive. Such, not only transmission installation is convenient, decrease brace up, and still improved those who hold the position of the main shaft of Huo bore with a reamer of transmission to get power. Because if use means of conventional positive drive, job of axis of Huo bore with a reamer is equivalent to one cantilever bridge, not only suffer torsional M, and the effect that still suffers diameter force P, if pursue,4a place is shown. Graph 4 main shaft get force model and use shaft coupling drive to suffer torsional M only, do not suffer radial load P(to see graph 4b) , for transmission shaft of type of discharge carry on one's shoulder. Improved the main shaft of Huo bore with a reamer that makes main shaft make transmission shaft again already to get power thereby. (6) increases the structural strength of gear. Because accept the restriction that dimensional structure and standard modulus, tine counts, gear structure space is limited, we take gear modulus for 1.

5 or 2, tine number is taken be more than 17. Increase gear breadth appropriately at the same time, will deliver torsional smooth key to move put tooth profile back end, if the graph shows a structure 5 times, in order to increase the structural strength of gear. Graph 5 main shaft use gear CNC Milling