SU1348151A1 - Method of working the parts of gear type by free abrasive - Google Patents

Abstract

The invention relates to surface finishing with a free abrasive and can be used in mechanical engineering when removing burrs and blunting sharp edges on teeth of gear-type parts. The purpose of the invention is to simplify the process of controlling the position of the fairings. The method allows the removal of burrs and blunting of sharp edges on the teeth of gear-type parts when using spring-loaded fairings. Item 2 is mounted on a spindle with spring-loaded fairings 4. The spindle is immersed in vibrating hopper 11 filled with abrasives 12. The working fluid is pumped through the abrasive using pipelines 13 and 14. The position of the fairings is adjusted by varying the flow rate of the working fluid within one processing cycle within 0, 4 - 1.0 l / min. 2 Il. 1 tab. CL 00 4 00 SP of FIG. /

Description

The invention relates to surface finishing with a free abrasive and can be used in mechanical engineering when removing burrs and blunting sharp edges on teeth of gear-type parts.

The purpose of the invention is to simplify the management of the position of the fairings,

FIG. 1 shows a device for implementing the proposed method, a general view; FIG. 2 is a view A of FIG. 1;

The workpiece 2 is attached to the spindle of the machine 1 - a disk of a turbine impeller with fir grooves 3 for blade installation. The fairings 4 are also attached to the spindle, which are spring-loaded with springs 5 and can move radially along the rod 6 along the end surface 7 of the part 2, Working surfaces 8 The fairings are made equidistant around the 9 cavities of the disc slots. On the surface to be machined, the surface of the part is covered with a protective casing 10, Part 2 is immersed in a vibrating bunker 11 with a moistened abrasive 12 and brought into rotation. The abrasive slurry consists of a solid phase — an electrocorundum grinding kernel and a liquid phase — a lubricating coolant pumped through the abrasive with a pump (not shown) using pipelines 13 and U,

The number of fairings can vary from four to the number of cavities between the teeth of the disk, depending on the process conditions, the size of the disk and design considerations, it is chosen experimentally,

The position of the fairing relative to the circumference of the tooth pits is changed by increasing or decreasing the viscosity of the abrasive medium by decreasing or increasing, respectively, the flow rate of the lubricant-coolant (LCL) pumped through the abrasive during one treatment cycle within 0.4 - 1.0 l / min

An increase in the viscosity of the abrasive medium with a coolant lubrication value of less than 0.4 l / min leads to an increase in productivity, with the possibility of cutting the tooth foot to a greater extent for parts with smaller radii (pr n const). Increasing the coolant supply to more than 1 l / min leads to a decrease in viscosity of the abrasive medium and overlap

the base of the tooth, i.e. abrasive jet deflection will not provide tooth processing throughout

perimeter. The feed rate of the fluid being pumped through the abrasive medium is prescribed for each part size; location of fairing (marginal zone deviating

abrasive jets) Determined by a control sample for a batch of parts.

The coolant flow rate of 0.4 l / min provides the necessary moisture content of the abrasive of 12–14 vol.% With an abrasive mass of 35 kg. The operation of the installation implementing the method is recommended only after reaching the specified abrasive moisture. After completion of processing one side of the edges of the teeth of the disk reversed

spindle rotation. Then stop the rotation of the spindle, turn the disk 180, set it to process the other end surface. Linkage location of fairing

and parameters of the spring follows from the following: the mass of one flap m 45 g 0.045 kg; radius of installation of the center of mass (initial position) of the spinner R 80 mm; the number of revolutions per minute at 2500 rev / min; centrifugal force P m-R kgf; angular velocity j

) lE - JCh2 V 302 - J X

X 0.045 X 0.08 25 n 2.5 kg-s

From these data, the parameters of the expansion spring are selected in accordance with GOST 9389-75. Р1 - spring force at preliminary deformation, kgf; P2 - spring force during working deformation, kgf; РЗ - spring force at max, deformation, kgf; spring height h 20 mm;

, 1 o

thirty

s.- p

 eleven.

five

spring diameter d 10 mm P2

 1-0,05 spring stiffness Z

 1.64 kgf.

0

five

P2

i-o7i

Р2зР1

R

 Oh, 125 kgf.

An extension spring of 1 cl ,, 1 bit is selected according to GOST 9383-75, No. 240,

When changing the 1p-1I flow rate of the fluid pumped through the abrasive, within the recommended limits, an increase in the length of the spring from the beginning to the end of processing corresponds to 1.5-3 mm,

Example: The treatment was carried out using white electrocorundum grinding grain alumina as a filler.

No, mm. Spring number

40 - 80,240

ten

3 134815 arch 25 A with a grain size of 100 and electrocorundum of normal grade 13 A according to OST 3547-80 under the following modes:

Cutting speed, m / s 7-18. C. Duration of treatment, mi :: Initial viscosity of the suspension,% Dry abrasive mass, kg

Coolant emulsion consumption, l / min

Vibration frequency, Hz Oscillation amplitude, mm

Depth of immersion of parts and samples in the abrasive medium, counting from its upper level in the container 2-20

12 - 14

35

0.1 - 1.2

22

15

20

Parts to be processed are turbo-rims of the compressor.

The results of processing are listed in the table.

Claims (1)

Invention Formula The method of processing free gear abrasive parts, in which the abrasive is loaded into the working container, moistened by pumping working fluid through the container, oscillating movements are reported to the working container, then the workpiece with spring-loaded fairing is immersed in the abrasive, the rotational movement is reported to it and the position fairings, characterized in that, in order to simplify the process of controlling the position of the fairings, the abrasive is moistened to provide an initial moisture value of 12-14% by volume, and then change the viscosity of the abrasive by changing the flow rate of the working fluid during one treatment cycle in the range of 0.4-1.0 L / min. Fi & .2 Editor M. Bandura Compiled by L. Karelina Tehred L. Oliynyk Proofreader I. Muska Order 5153/14 Circulation 714 Subscription VNIIPI USSR State Committee . for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4