RO116371B1

RO116371B1 - Radial feed device for a honing tool

Info

Publication number: RO116371B1
Application number: RO94-00723A
Authority: RO
Inventors: Gheorghe Tauru; Emilian Tauru
Original assignee: Universitatea Craiova
Priority date: 1994-04-27
Filing date: 1994-04-27
Publication date: 2001-01-30

Abstract

The invention relates to a device which is included in honing machines and which provides the radial feed, intermittently or continuously. According to the invention, the device comprises some linear hydromotors (C and D) which drive some ratchet mechanisms (F) and a rack-and-pinion mechanism (17) causing the radial feed intermittently or continuously and also a linear hydromotor (E) drawing near and withdrawing the honing prisms quickly by moving a piston fixed on a bush (11). A micrometric rod (37) and a comparator (25) switch off the linear hydromotors when the final dimension is reached.

Description

RO 116371 BRO 116371 B

Invenția se referă la un dispozitiv pentru realizarea avansului radial al sculei de honuit, asigurând avansul intermitent la honuirea de degroșare și avansul radial continuu, în ciclul de lucru automat, prin intermediul comenzii adaptive.The invention relates to a device for realizing the radial advance of the honing tool, ensuring the intermittent advance during roughing honing and the continuous radial advance, in the automatic work cycle, by means of the adaptive control.

Sunt cunoscute dispozitive pentru realizarea avansului radial, formate dintr-un corp 5 central, în care culisează un piston acționat hidrostatic, pentru realizarea avansului radial, de către un con de extensie, al sculei de honuit.There are known devices for achieving the radial advance, consisting of a central body 5, in which a hydrostatically actuated piston slides, for achieving the radial advance, by an extension cone, of the honing tool.

Dejavantajele acestor dispozitive pentru realizarea avansului radial constau în aceea că prezintă construcții care nu permit reglarea avansului radial de degroșare și finisare, nu permit apropierea și îndepărtarea prismelor de honuit, la începutul și sfârșitul io prelucrării, iar precizia de realizare a avansului radial este redusă.The disadvantages of these devices for making the radial advance consist in the fact that they have constructions that do not allow the adjustment of the radial advance for roughing and finishing, they do not allow the approach and removal of the honing prisms, at the beginning and end of the processing, and the precision of making the radial advance is reduced.

Problema pe care o rezolvă invenția este construirea unui dispozitiv pentru 1 realizarea avansului radial, robust fără jocuri și frecări, cu trei motoare hidraulice, care să realizeaze avansul intermitent pentru faza de degroșare, avans radial continuu în ciclul ₁ de lucru automat, prin intermediul comenzii adaptive și avans rapid, pentru apropierea j 15 și îndepărtarea prismelor de honuit la începutul și sfârșitul ciclului de prelucrare.The problem that the invention solves is the construction of a device for 1 achieving the radial advance, robust without backlash and friction, with three hydraulic motors, which realizes the intermittent advance for the roughing phase, continuous radial advance in the _1st automatic work cycle, by means of the command adaptive and rapid feed, for j 15 approach and removal of honing prisms at the beginning and end of the machining cycle.

i Dispozitivul pentru realizarea avansului radial, conform invenției, rezolvă problema de mai sus, prin aceea că mărește gama de precizie a pieselor ce pot fi prelucrate, realizează reglarea automată, intermitentă și continuă, a avansului radial, îl menține întreg ciclul de prelucrare, dispozitivul fiind alcătuit dintr-un corp principal, în care se 20 montează niște hidromotoare liniare. Un hidromotor liniar realizează forța de apăsare necesară realizării avansuluii intermitent, iar celălalt hidromotor realizează forța de apăsare constantă, necesară avansului radial continuu, automat, cu ajutorul unui mecanism cu clichet, a unui pinion cremalieră, a unui cuplaj de depășire în ambele sensuri și a unei transmisii melcate, care realizează mărimea avansurilor la cursa de 25 coborâre. Alte hidromotoare liniare, acționate cu un mecanism cu clichet, un mecanism pinion cremalieră și niște transmisii mecanice, asigură avansul radial intermitent sau continuu la cursa de revenire și un alt hidromotor liniar realizează îndepărtarea și apropierea rapidă a sculei de honuit, de piesa de prelucrat.i The device for achieving the radial advance, according to the invention, solves the above problem, in that it increases the range of precision of the parts that can be processed, realizes the automatic, intermittent and continuous adjustment of the radial advance, maintains it throughout the processing cycle, the device being made up of a main body, in which some linear hydromotors are mounted. One linear hydraulic motor provides the downforce required for intermittent feed, and the other hydraulic motor provides the constant downforce required for continuous radial feed, automatically, with the aid of a ratchet mechanism, a rack pinion, an overrunning clutch in both directions, and of a worm gear, which achieves the size of the advances during the 25 descent race. Other linear hydromotors, operated with a ratchet mechanism, a rack and pinion mechanism, and some mechanical transmissions, provide intermittent or continuous radial feed on the return stroke, and another linear hydromotor performs the quick removal and approach of the honing tool to the workpiece.

Dispozitivul conform invenției prezintă următoarele avantaje:The device according to the invention has the following advantages:

- realizează operația de honuit cu avansul radial intermediar, la faza de degroșare și cu avans continuu în ciclul de lucru automat cu comandă adaptivă;- performs the honing operation with intermediate radial feed, during the roughing phase and with continuous feed in the automatic work cycle with adaptive control;

- crește precizia dimensională și calitatea suprafeței prelucrate;- increases the dimensional accuracy and the quality of the processed surface;

- crește capacitatea productivă a prelucrării;- increases the productive capacity of processing;

- scade costul operației de prelucrare;- lowers the cost of the processing operation;

- înlătură fenomenele dinamice cauzate de forțele procesului și de variația lor în timp, menținând prelucrarea constantă pe toată durata de lucru, indiferent de apariția mărimilor perturbatoare.- removes the dynamic phenomena caused by process forces and their variation over time, maintaining constant processing throughout the working period, regardless of the appearance of disturbing quantities.

Se dă, mai jos, un exemplu de realizare a invenției, în legătură și cu fig. 1 și 2, care reprezintă:An example of an embodiment of the invention is given below, also in connection with fig. 1 and 2, which represent:

-fig. 1, schema cinematică a dispozitivului;-fig. 1, kinematic diagram of the device;

- fig. 2, secțiune longitudinală, prin dispozitiv.- fig. 2, longitudinal section, through the device.

Dispozitivul conform invenției este constituit dintr-un corp 19, în care se montează un hidromotor liniar C și un alt hidromotor liniar D, care realizează forța necesară menținerii avansului radial, intermitent și continuu. Hidromotorul C acționează, cu un 45 mecanism cu clichet F, un cuplaj de depășire în ambele sensuri G și prin intermediul uneiThe device according to the invention is constituted by a body 19, in which a linear hydraulic motor C and another linear hydraulic motor D are mounted, which produces the force necessary to maintain the radial advance, intermittently and continuously. The hydraulic motor C acts, with a 45 ratchet mechanism F, an overrunning coupling in both directions G and by means of a

Claims

RO 116371 B wedges 8, a worm gear 7, supported by some bearings 6, pressed by a cover 5 fixed, with some screws 2 and a flange 1, in the body 19. Another bearing 6 on the body of the worm wheel 7 is pressed by a cover 12 mounted on a bushing 9. The bushing 9 drives, through a wedge 22, a nut 10 which performs the intermittent advance during the descent stroke. Another linear hydromotor A and linear hydromotor B actuate a rack pinion H, 50 a ratchet mechanism I, a two-way overrun coupling J, a worm gear 7, secured with a wedge 8, a bushing 11 provided with an internal thread, in which a nut 10 of the mechanical transmission of the first kinematic chain is threaded, making continuous radial advance during the descent stroke. A bushing 27 is secured with a threaded pin 23 against rotation with respect to a body 21. □ threaded nut 29 is solid with a disc 30, through some 55 screws 32, and rotates supported on a radial-axial bearing 28, achieving at a stroke h, an advance A _s = constant, read on a comparator 25 fixed on a support 31. On the body 21, on a plate 33, with some screws 36, a micrometric rod 37 is fixed, which adjusts and stops the linear hydromotors A , B, C and D, when the final dimension of the honed piece has been achieved. 60

The return to one of the two feeds, intermittent or continuous, of work on the lifting stroke or on a work cycle is achieved by a hydraulic motor A and a hydraulic motor B, which actuates a ratchet mechanism I and the rack pinion mechanism H, a coupling of overtaking G and an overtaking coupling in both directions J worm transmission 7, bushing 9, the kinematic chain performing in the opposite direction to the realization 65 of the advance in the descent stroke, A _s =constant.

The rotational movement from the main shaft M, of the honing machine, is transmitted through a wedge 4 fixed, on the main shaft M, with some screws 3, to the execution body, which performs the adjustment of the intermittent and continuous radial advance in the work cycle driven, remaining constant throughout the machining, using, as the adjustment quantity, the contact pressure between the honing prisms of the honing tool and workpieces..

The rapid approach and withdrawal of the honing tool is done with a linear hydraulic motor E whose hydraulic chamber is made of a cover 20, a piston 17 stiffened by the bushing 11 with a pin 16. The sealing of the cover 12 is ensured by some sleeves 13 75 and 14, and of the piston 17, with a sleeve 15, preventing the passage of the hydraulic agent in a chamber a, delimited by the body 19 and the bushing 11. The supply of hydraulic fluid is ensured through connections 18 and 24

Resale 8 o

Device for making the radial advance of the honing tool, characterized by the fact that it consists of a body (19), in which a linear hydraulic motor (C) and another linear hydraulic motor (D) are mounted, which makes the intermittent and continuous advance with A _s = constant, in single downstroke, or two-phase honing, roughing and finishing 85 intermittent and continuous feed with A _s = constant, in simple downstroke or two-phase honing, roughing and finishing, the hydraulic motor ( C) driving, in motion, a ratchet mechanism (F), an overrunning clutch in both directions (G), a worm gear (7) and, by means of a wedge (9), a bushing (9) that actuates a another bushing

RO 116371 B

90 (11) with A _s = constant, to the simple return stroke and return to a new machining cycle, which is done automatically, by the adjustment and stop signal given by a micrometric rod (37) and a frame comparator (25 ) and is made with a linear hydraulic motor (A) and another linear hydraulic motor (B) that actuates a ratchet mechanism (I), a rack-and-pinion mechanism (H), an overrunning clutch (G), an overrunning clutch in the

95 both ways (J), a worm gear (7), which actuates the bushings (9 and 11), the rapid approach and withdrawal of the honing prisms of the honing tool being achieved with another linear hydraulic motor (E), by moving a piston (17) fixed on the bushing (11), up and down, the rotary movement to the honing tool is transmitted from the key (4), fixed on the main shaft (M) with some screws (3) and a nut (26) at the execution body, ioo which performs the adjustment of the radial advance, intermittently and continuously, keeps it constant throughout the entire processing cycle, using as a measuring and adjustment quantity the pressure of '1 contact between the tool and the piece.

J

The president of the examination committee: Eng. Nicolae Zamfir

Examiner: Eng. Radu Anghel