Che Xi is compound the treatment of worm of graduation of machining center high accuracy

The geometry of worm joins several modulus: 3mm, head number: 1. Lead: 9.

4248mm, part way: 100mm, helix angle: 43 ′ of 1 ° 6 ″ , helix direction: Right, tooth form horn: 12 ° , tooth form: Lengthen involute. Graph 1: Worm structure sketch map pursues 2: Tine department method to profile 　 2.

Technical requirement 　 (1) worm law presses transverse tooth thickness of pitch circle of actual measurement of hob of worm wheel essence to decrease to pitch circle transverse tooth thickness thin 0.

03~0.

05mm. (2) worm tooth form and tooth form of hob of worm wheel essence are consistent. (3) 2 as different as φ 70h5 journal and helix dentiform axes spend whorl M68 × in 0.

Inside 002mm. (4) long roll flute carries round horn R0 on the head.

5, tail end of take out helix is less than the not complete tine of 1mm. (5) material: 18CrMnTi, cementite, selective hardening Rc62-65. (6) tooth flank is bright and clean degree for Ra0.

2.

3.

Precision requirement 　 (1) pitch circle brace up place 0.

002mm. (2) pitch error ± 0.

002mm. (3) ± of error of pitch accumulative total 0.

006mm. (4) corkscrewed yarn deviation: Worm turns for 0.

003mm, worm is endlong 0.

004mm. (2) the treatment process of graduation worm forgings the circle outside vehicle of fine of → of aperture of drill through of → of thick car of semifinished product → and benchwork of → of tooth form of helix of car of end panel → go outside kibble of → of helix edges and corners → of cementite of → of examination of circle and flaw detection of magnetic force of → of tooth form of helix of kibble of end panel → grinds top. (3) the analysis of main working procedure and demonstrative 　 1.

The circle outside tooth form of the helix before cementite and journal and angle square end panel want grinding, the purpose depends on assuring even cementite layer. If cementite part surface is not bright and clean, the depth that can create cementite layer not divide evenly, cause crackle is caused because of grinding shaven heat after quenching and discard as useless. 2.

End panel of the circle outside journal, angle square and working procedure of grinding of helix tooth form come more 5 to 6 foreword, and every time after grinding, want oil to boil qualitative eliminate stress. Such doing basically is for control every time the surplus of grinding is not quite large, grinding time is not quite long, will make workpiece brings about crackle because of grinding shaven heat otherwise. For many times qualitative processing, its purpose depends on eliminating what cause as a result of stress after grinding to be out of shape, ensure thereby the stability of precision. 3.

In worm 60H7 of two end φ reachs the mount inside φ 52H7 aperture two high-speed steel quietly, its purpose is grinding worm journal and end panel and helix tooth form at assuring final choice from time to tome a very accurate treatment is standard central aperture. Because be in,φ 60H7 and end of φ 52H7 aperture use aperture of 60 degrees of thimble to regard as fiducial assure hard 0.

The jumpy public errand of 002mm and tooth form place 0.

The corkscrewed yarn deviation of 002mm. Treatment practice proves to use quietly little center Kong Ji is to raise grinding to assure of precision reliably definitely. 4.

For many times purpose of examination of magnetic force flaw detection depends on discovering workpiece is machining crackle of the generation in the process in time, make reject spare parts continues to be machined uselessly no longer. After guiding magnetism flaw detection is checked, must do demagnetization processing, otherwise meeting influence issues the treatment precision of working procedure. (4) need to notice following item 　 when form of roll flute of essence of life 1.

The parallel sex allow that the head wears the emery wheel that check and adjusts worm grinder to move at axial of machine tool workbench relatively is poor 0.

005/500mm, change of axial of main shaft thimble is moved be less than 1 micron, radial and jumpy be less than 1.

5 micron, around thimble and interface of workpiece thimble aperture are accumulated not under 80 ％ . 2.

After worm mount machine tool, examination journal radial is jumpy should be less than 3 micron, diameter of or so two end jumps the examination circumstance before the direction of on any account of the quantity must accord with essence of life to grind. 3.

In choosing 80~120 granuality grinding of soft alumina emery wheel. Strict essence, dynamic balance must have before emery wheel packs a machine tool. The cooling fluid that a large number of cleanness use in grinding process is cooling. 10~15 of workpiece rotate speed turns / minute, feed is journey of workbench move back and forth 0.

01~0.

02mm, the workpiece in whole grinding process cannot give out heat, after overall surplus is ground, make 2~3 amend grinding of journey of second move back and forth without feed. 4.

To assure to match the contact of check with worm wheel clench the teeth stain asks, emery wheel dentiform is amended, the collocation of gear of commutation of machine tool lead, the tooth form corner that must cut hob of worm wheel tooth form by essence of life and lead undertake adjustment. Transverse tooth thickness of worm pitch circle is decreased by transverse tooth thickness of pitch circle of hob actual measurement thin quantity of a backlash. 5.

The round size control outside be being ground in the light of 7 6.

Machine size control in the light of face of helix tooth form CNC Milling