CA1260272A - Thermopulse apparatus for deburring parts - Google Patents

Abstract

THERMOPULSE APPARATUS FOR DEBURRING PARTS

ABSTRACT
A thermopulse apparatus for deburring parts has a hollow body housing a working chamber in such a manner as to define a space between the outer walls thereof and inner walls of the body for liquid partly filling the space. The chamber has spark plugs, an inlet valve, an exhaust valve mounted in the bottom part of the clamber along the longitudinal axis thereof under the layer of liquid, and a cover member for ac-commodation of the parts being treated, the cover member being reciprocatable within the chamber. Ports are provided in the side walls of the valve and in the cover member on the side of the valve.

Description

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THER~OPU~SE APPARA~US ~OR DEBURRING
PARTS
'~he invention relates to spparatuses for deburring parts; in particular7 it deals with a thermDpuls~ ap-paratus for deburring parts.
The inventiDn may ba successfully ussd at m~cha-nical engineering plants ~or cleaning metal a~d plas-tic parts frDm burrsO
Enown in the art i8 a thermDpulse apparatus for deburring parts, cDmprising a C-shaped fram~ having a wDrking chamber and a table having trays ~Dr sccDmmDdat-ing parts, the table being mDvable by m~ans Df a hgd-raulic cylinder ~cf~ US patent No. 36662521 Clo 266J2R~
published May 30, 1972).
The psrts being treated are Dverheated in this priDr art apparatus by the excessive heat of cDmbus-tiDn prDducts because, by virtue of the apparatus design, it is not possibl~ tc affect a rapid remDval of` cDmbustion products frDm the chamber; tbe part treat-ment cycl~ is 5-20 sHcDnds longer, and a substantial depDsit of cDmbustion product particles remain on the parts after the treatment. In additiDn, the process of parts treatmant in ~uch apparatus is accDmpanied by strong noise t and pollution of' the environment t~kes place because combustion prDducts are nDt cleaned ~ e abovemantioned disadvantages have be~n partly eliminated i~ a thermopulse apparatus for deburrin~

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parts, comprising a frame having a worki~ chamber housin~ spar~ plugs, an inlet valve for fillin~ the interior OI' tne cha~ber with fuel mixture, and an exhaust valve for ~emovin~ combustion proaucts from the interior of the chamber, and a cover member for a~commodation of parts bein~ treated, the cover member being mounted for reciprocations witnin the chamber (cf. USS~ Inventor~s Certificate No. 9~8499, Cl. B 23 28/00, 3 23 ~ 7/06, publ. January ~5, 1~83).
;l`ne exnaust valve of the prior art apparatus i5 mounted in the cover member of the workin& chamber and is to withstand the direct action of nigh-tempe-rature comuustion proaucts upon ignition OI tne fuel mixture; wnen t~l~ combustion proaucts are discharded, a LaS flow containin~ particles of metal o~ides and burnt burr material will act on the valve. Under these conditions, the valve cannot r~ist continuous cyclic action of tnese factors and has to be frequently replaced.
In addition, a loss of sealin~ of the valve as a result of the abovementioned factvrs impairs reliabi-lity and safety of the apparatus as a ~hole in opera-tion because of eventual leaka~e of the iuel mixture.
In order to lower noise of combustion products dis-char~ed from the abovedescribed apparatus, one should provide special deviceS.

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It is an object of the invention to improve re-liability and safety of' tn~- apparatus as a ~hole.
Anotrler object OI the invention is -to prolong service lif'e of t~ie ex~laust valve.
Still another object of the invention is to lower noise level during dischar~e of' combustion products from the interior of trle chamber with their concurrent cleaning from metal oxides and particles of the mate-rial of burrs being removed so as to protect the en-vironment.
'1'he above objects are accomplished by that in a thermopulse apparatus for deburring parts, comprising a frame having a ~orking cnamber housing a spark plug, an inlet valve for fillin~ t~e interior of' the cham-ber with f`uel mixture, an exhaust valve for discharg-ing combustion products from the interior of' the cham-ber, and a cover member for accommodation of parts being~ treated, the cover mernber beinO !r,ounted f'or re-ciprocations within the crhamber, according to the in-vention, the frame comprises a hollo~i body, the work-I ing chamber is disposed ~lithin the body ao as to definea space between the inner walls of the body and outer walls of the chamlber partly filled Wit~l liguid, the exhaust valve is ~ou~ted in t~le bottom part of the workin~ chamber to exten~ along the longitudinal axis thereof' under the layer of' liguid, the valve having ~;26V'~

ports in the si~e walls thereof for establishing commu-nication betv~een the space for liquid and tne interior of tne worKing chaTuber, nd t~e cover mel~lber f~or ac-com~oaation of tLle parts being treated having ports on the side of tne e~haust valve for tne passage of co~-bustion products from the interior of the working cham-`D~r tnrou~h the inlet port of tne outlet valve and its ~orts in tne side ~Jalls into the space for liquid.
'This construction of tne apparatus accordin~ to tne invention m~kes it possible to improve reliability of tne exnaust valve, lo,~er noise ol combustion pro-~ucts diScharge from the interior of the working cham-ber after the treatment and allows tne combustion pro-ducts to be cleaned from burnt burr material and metal oxiaes by causing them to pass through the liguid.
I~hese ana o~ner objects of the invention will be-co~e apparent from the f'ollowing aetailed description of a sper,ific embodiment thereof v/ith reference to tLle accompanying drawings, in which:
~ i~. 1 shows a tnermopulse apparatus for deburr-ing parts accordin~ to the invention, in the initial position of loading (unlo~ding) parts bein~ treated, in longitudinal section;
Fig~ 2 is ditto of E'ig. 1, in the position of discharge of combustion products;
Fig o 3 is a view ta~en alon~ arrow A in h1ig, 1;
Fig. 4 is ditto of ~ig. 1, in tne position before ~60~7~

ingniting f'uel mixture.
h tLlermopulse apparatus for deburring parts ae-eording to the invention comprises a frame 1. The frame is in the ~orm oi a nollo~ body (Fio. 1). ~he body 1 accommodates a ehamber ~ ~3hieh is mounted uy m~ans of cross-pieces 3. ~ spaee 7 is defined between inner walls 4 of the body 1, its bottom wall 5, outer walls 6 of the enamber 2 and e~oss-pieees 3 to eontain liguid 8 partly filling tne spaee.
The coni`iguration of the body and chamber may be of any shape suitble for a given application.
Tile v.orking chamber 2 aecomL~odates spark plugs, 9, an inlet valve 10 for i`illing t~le interior 11 of the chamber 2 with fuel mixture (as shown by arrow B), an exbaust valve 12 for discharging combustion products from the intelior 11 of trle chamber 2 (as shown by arrow C in Fig. ~), and a cover member 13 (Fi~. 1) for aceom~odat-ion of a part 14 bein treated ~1hieh has burrs 1~ to be remov~d.
Tne spar~ pluos 9 and valve 10 are mounted in the chamber 2 on tne side of the outer walls 6, above the eross-pieces 3.
The exnaustvalve 12 is mount~d in the bottom part of the vJorking ehamber 2 under the layer of li-quid 8, along the lon~itudinal axis 16 o~ the working chamber.

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q'he exhaust valv~ 1~ comprises a hollo~, c~sing 17 nousin~ a Spool l& having a valve me:rber 1~ received in an inlet port 20 of t~le valve 12 maae in one of the end f~ces 21 of tLle casin~ 17 definin& the bottom of`
the cLlamber 2. '~e side vJalls 22 of the casin~ 17 are ~ade with pOI'tS ~3 for establishirl~ communication bet-~een tLle space 7 containing liquid 8 with the irlte-rior 11 of the chamber 2. /. port 25 is provided in the other end face 24 of tne casing 17 for admitting compr-essea air to the casing 17 ol tne valve 12. 'l;he end face 24 of` the casing 17 is incorporated in the bottom all 5 of the body 1.
The cover mem'ber 13 is mounted in the cha~ber 2 for reciprocatiorls by means of a hydraulic cylinuer 26.
The h~draulic cylinder 26 is secured to the upper part 27 of the body 1.
The cover ~ember 13 comprises a hollov~ body 2~.
One end 29 OI the body 2~ is secured to a piston rod 30 of the hydraulic cylin~er 26, ana the other end 31 dis-posed on the side of the exhaust valve 12 has ports 32 for tne passage of combustion products f'roln t~le inte-rior 11 of the chamber 2 through the inlet port 20 of the valve 1~ into a space 33 above the'spool 1~, ports 23 of the valve 23 into the liquid 8 and futher into the space 7 and a pipe 34 incorporated in one of the cross-pieces 3 and exterldin~ outside the body 1 ' - .

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through one openings 35 provided in side vJalls 36 of the body 1, tne ~ain function of the openin~s being to facilitate installation of the parts 14 being treated on the cover member and removal of these parts through openings 37 (Fig. 3) provided in walls 38 of the body 2~ ot trie cover member 13.
The design of the outlet valve and cover member may be of any appropriate type.
~ he thermopulse a~paratus Ior deburring parts functions in the follo~ing manner.
i~hen the apparatus is in the initial position (Fig. 1), the cover member 13 is in the uppermost po-sition. In this position the part 14 ~eing treated, which has burrs 15, is installed through the openings 35 and 37 on the end face 31 of tne body 28 of the cover plate 13. The spool 18 of the exhaust valve 12 is in tQe uppermost position and is pressed against the end face 21 o~ the casinG 17 of the valve 12 with its valve menber 19 to shutofi the inlet port 20 o~ tne valve 12. A layer of liquid 8 is disposed above the valve 12. The piston rod 30 (Fig. 4) is moved by the hydraulic cylinder 26, a~d tLle cover member 13 carry-in~ the part bein~ treated is moved into the lovver-most position. ~he end 31 of the body 2~ of the cover member 13 is placed above t~e liguid ~. The interior 11 of the chamber 2 is filled witn fuel mixture through ~Z~ 7~

tne inlet valve 10 ~s srlown by arrow B. When a pre-set pressure is ac~ieved in trle interior 11, the fuel mix-ture is ignited by the spark plugs 9.
As a result of a steep rise of pressure in the interior 11 of` t~e chamber ~, a~d temperature increase 7 burrs 15 are burnt and~or fused on the part 14 being tr~ated owin~ to their larg~ surface area and a re-Iatively low mass.
.~igh-temperature conbu~tion products containin~
metal oxides ~nd burnt burr material s~lould be evacuated from the in~erior 11 ot' the cham~er 2 as soon as pos-sible since the excessive heat of combustion products ~ay result in overheating o~ tne parts 14 bein~ treat-ed, and the particles and metal oxides may be deposited on tne part 14 bein~ treated and on the inner walls of the chamber 2 so tuat tneir further cleaning may be necessary.
'l'he combustion products are discharged by means of tne exhaust valve 12 (Fig. 2).
'iihen co~pressed air supply'throu~h the port 25 into the sp~ce 39 under the Spool 1~ i~ suspended, the spool 18 is shifted into its lowermost posltion under the action of' ~au~e pressure OI combustion products in the interior 11 of tne cnamber 2.
Co~bustion products 40 will displace the liguid 8 above the valve member 19 trlrou~h the port 20 and ports 23 and will pass throu~h the layer of liquid 8 ~ 2 7~

into the space 7. 'l'hus the co~bustion produc~s are clean~d from aust and small-size suspended particles they contairl and vill also give up heat and energy.
Then the combustion products are remov~d tnIou~h the vipe 34 out of the space 7 outsiae tr,e ~pparatus as shown by arrow D. 'iht ports 32 provided in ~ne end 31 of the body ~8 of the cover member 13 are designed for the passa~e of the combustion products 40 and are àlso capable o~ retaining coarse particles of burnt burrs 15 so L~S to ~rDtect the valve member 19 a~ainst ~ama~e.
Subseguently, the cover 13 is moved by the hydraul-ic cylinder ~5 into its initial uppermost position shown in Fig. 1.
'l'he apparatus accordin~ to tLle inve~tion ma~es it possible to enlarge tne range OI' parts being treated since the excessive heat ol combustion products is not transmitted to tne part being treated and is removed from the v~orkin~ chamber throu~h the exhaust valve whicn is especially important for parts maae of ~lu-minium alloys and other similar materials. ;l`lle ~eposit of metal oxides and particles of burr material on the parts after the treatment is reduced.

Claims

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
A thermopulse apparatus for deburring parts, comp-rising:
- a frame comprising a hollow body having inner walls;
- a working chamber having outer walls and an interior, the working chamber being accommodated in said body in such a manner that a space is defined between said inner walls of said body and said outer walls for liquid partly filling the space;
- said working chamber having a top part and a bottom part, spark plugs mounted in said top part, an inlet valve for filling said interior of said cham-ber with fuel mixture mounted in said top part, an exhaust valve for discharging combustion products from said interior of said chamber mounted in said bottom part of said chamber along the longitudinal axis thereof under the layer of said liquid, the exhaust valve having a casing with an inlet port and side walls which have ports for establishing commu-nication between said space for said liquid and said interior of said chamber, and a cover member for accom-modation of the parts being treated, the cover member being mounted for reciprocations within said chamber and having ports on the side of said exhaust valve for the passage of said combustion products from said interior of said chamber through said inlet port of said casing of said exhaust valve and said ports in said side walls of said casing of said exhaust valve into said space for said liquid.