Raise measure of service life of machine tool spare parts a few

The mechanical spare parts in metallic cutting machine tool, wait like nut of worm of gear, worm wheel, guide screw, because suffer the effect that delivers torque, pressure to wait, generation wears away reach attaint, make the precision of the machine tool and function drop, influence workpiece machines quality: And produce breakdown as a result of equipment, often stop machine repair, reduced effective working hours, the influence manufactures efficiency: Because a few spare partses are congenital design blemish, press sometimes unvarnished after repairing, the result is bad, so, must improve in order to improve the service life of machine tool spare parts. When we are repairing a machine tool, did not press simply unvarnished repair, however particular case is particular analysis, be aimed at the different situation that the spare parts damages, formulate repairs plan in detail, fragile to those the spare parts is chosen from material, the structure improves two respects to take step, obtained the favorable result that improves spare parts life. A few example are lifted to try to explain below. Because craft of material, heat treatment is chosen,attaint of a lot of machine tool spare parts that 1 material chooses us to be encountered in maintenance all are undeserved those who cause, for example: Boring machine of X53T milling machine, T618 advocate boring machine of milling machine of drive-box gear X53T, T618 makes manufacturer use in machinery very general, the mistake with these two kinds of the biggest machine tools depends on from advocate electric machinery arrives between main shaft advocate drive-box gear often dies tine, often stop for this machine repair, manufacturing loss is bigger. Previously, use enterprise sets out from angle of change drive catenary mostly, change especially greatly on the structure, although got a few result, but workload is big, time-consuming and arduous. When we are analysing phenomenon of tine of collapse of gear of these two kinds of machine tools, think the 4mm of modulus M=3 ～ of these gear, the intensity that designs parameter is OK, produce the account that collapse ages, basically cause: The material that gear of primary machine tool chooses is 45 steel mostly, tine ministry is high frequency quench processing, because age root ministry intensity is insufficient and suffer concussion to rupture, use a week to control gear wheel even by batter. After the reason is found, we made following tests, still use 45 steeliness to build, but undertook improvement on craft, forge of gear semifinished product hits → of → thick car to move qualitative → → of tine of shave of → of the gear hobbing before shave of → of vehicle of fine of → of keyhole of garland of → of half fine vehicle is high frequency quench (tine ministry) , the main key of this craft was increasing to move working procedure of simple heat treatment together between thick, essence, make the integral intensity of the spare parts rose, also increased the strength of tine root of course. Via try out falling in coequal treatment condition, the gear that this craft machines, can use 3 months the most shortly, can use a year or so the longliest. To improve gear intensity and life further, we chose material of 20CrMnTi alloy steel to make gear, heat treatment working procedure quenchs for cementite, tine ministry hardness 58 ～ 63HRC, use via more than 10 years, did not produce collapse tine phenomenon up to now, solved collapse tooth problem. Tool carrier of Y38-1 gear-hobbing machine rises fall tool carrier of gear-hobbing machine of Y38-1 of guide screw nut rises fall guide screw nut deputy in, guide screw moves qualitative processing formerly to be made with 45 steel classics, nut uses HT200 ash the mouth is cast-iron make, two make manufacturing half an year influence time, because wear extent is big,must change. Brass of casting of QSn6-6-3 of our try out makes nut after, also only left and right sides of a year of time can be used. For this we analysed gear-hobbing machine tool carrier to rise fall the circumstance getting power of guide screw nut, flank of nut tooth form should bear already very great cutting power, should bear again the weight of tool carrier, and grey iron and the tensile strength with brass QSn6-6-3 are low, wear away so very fast, must choose wearability and mechanical intensity to hold the material of actor concurrently, as it happens of nodular cast iron has these two advantages. Through the analysis, we choose QT60-2 nodular cast iron, its intensity is 4 times of QSn6-6-3, will make nut with it. Via be being used actually, prove life rises greatly, can use 5 years of above, and the 1/6 that cost of raw materials also has QSn6-6-3 copper only. In be repaired actually, change the case that chooses material is very much, afore-mentioned two just in order to explains. But want to notice, different machine tool is different the mechanical spare parts of place, want to undertake sufficient analysis, want to satisfy the functional requirement of original machine above all, want to stress economy next, reduce cost, such converting the result that get twice the result with half the effort reachs since material ability. Attention, use a part to the designs formerly insurance on equipment of a few machine tools, be cannot change its material to reach those who increase its strength at will, meet those who cause equipment accident, person accident happen otherwise. 1.

Filar lever 2.

Nut 3.

Nut 4.

Bolt of a junction of the edges of two sheets of paper pursues 11.

Filar lever 2.

Nut 3.

Nut 4.

Close solid nut pursues 22 because the structural design of spare parts of primary machine tool is unreasonable,improve spare parts composition, as a result these spare parts in use often damage, such circumstance also common occurance. Try to improve when repair, also can rise to improve the result of spare parts service life. The nut when if YB9332C pours horny chance,be being designed formerly the structure is shown 1 times like the graph. Bolt of a junction of the edges of two sheets of paper often damages make nut is exited, generation breakdown. For this, we are constructive to its structure 2 shown improvement. Thereby, solved the problem that nut exits thoroughly, those who prevented to repeat breakdown is recurrent. The place on put together is narrated, repair a machine tool to want with improve hardware data and structural photograph tie, in order to lower equipment fault rate, prolong service life. CNC Milling