DE1652115C3 - Device for surface grinding of crankshafts - Google Patents

Description

50

The invention relates to a device for surface grinding of crankshafts, Consisting of machine frame with device for clamping the crankshaft and drive for the clamped crankshaft and at least one mounted on the machine frame on the to be machined Crankshaft attached and with tier crankshaft pleuclanig moving tool holder in which at least one oscillating grinding stone holder with grinding stone is attached, wherein the tool holder is a tripod with a bearing foot placed on the crankshaft having.

In the known Vorrichumiien of the following genus (I ¹ SA.-Patent Specification 2 277 047) the bearing foot is also the grinding stone and the grinding stone processes the actual bearing foot of the crank handle. ii. H. a cylindrical 1 pool Its oscillating movement is a reciprocating movement in the direction of a surface line of this cylindrical surface. The groove between the crank pin and the crank arm is not machined. - According to more recent studies (see research reports from the Ministry of Economics and Transport in North Rhine-Westphalia, No. 655), however, grooves or notches in the fillets are the starting point for fatigue fractures occurring on crankshafts. However, devices of a similar type for surface ^{machining 0} of crankshafts are known with which the flutes between the crank pin and crank arm are machined in crankshafts (cf. Machinery, 1961 Volume 98, pp. 276 to 278) worked with roller tools, the roller tools being guided over the surface to be processed and also the groove. However, finishing by roller burnishing a tool surface does not lead to satisfactory results, at least in the case of crankshafts. It is well known that the structure of workpieces is never of the same strength, density and hardness at all points. As a result, the roller burnishing tools can penetrate to different depths at the individual positions, based on the circumference of the workpiece. This, however, results in a different stretching and thus also a deformation of the axis of the crankshaft and, as a result, causes correction errors.

Also when machining straight shafts with transition fillets or radii between shaft parts of different diameters, similar roller burnishing operations have already been carried out, and in the sense of surface rolling (cf. VDI guidelines. 196:!, pp. 1 to 6). Even with these Measures occur the deficiencies described.

In the case of devices of a completely different type (cf. German Auslegeschrifft 1 300 834 or USA.-Patent 3 089 289) it is known with oscillating To work grindstones, which in workpiece parts provided with radii, e.g. in grooves of shafts or in rollers of ball bearing rings. The whetstones oscillate, so to speak the center of curvature of the surfaces to be machined. The problems around surface grinding of crankshafts in the groove between the crank pin and crank arm are thereby has not yet been influenced.

The invention is based on the object of providing a device of the type described at the beginning to develop further that also a surface grinding of the fillets between crank pins and crank arm can be carried out. To solve this problem, the invention teaches that the grindstone holder (s) arranged parallel to the stand of the tool holder and around one to the stand axis orthogonal swivel axis can be swiveled into a groove on the crank pin or on the central bearing as well as - as is known per se - around the own assigned to the groove center Axis can be driven in an oscillating manner.

The advantages achieved can be seen in the fact that with the device according to the invention, the fillets on the crank pin and medial bearing pin of crankshafts from an Oheiflüc!) easy grinding process unk'i / ogen can be, on the one hand about the pivoting movement and aiuici verweis about the Os / illati'insbewcgunt machining ^ processes in the Surface of the Ilohlkelil. realized graze that

1 652 I 15

SfucSSc ^^ n ^ keScn '"H ^? ^" "^ -» »^ η arranged parallel to the tripod

uaucrorucnc in aen Honikenlen no longer arises- 's, ι, ι, .-, γ. ., ^ "Ι,., Ι, m η u · · ι · λ ι

can hen . This is especially true if the tr,, Λ P ", f ^ ^A , ⁿ " ^rdnUn S ^su ^

Surface grinding by inserting ί \ JT ^e " _t V ^L : ^{inha ter} _u ¹⁰ " ■ "a for

«Nrrhendrr B, -irh, Mtiinov _C i _P ; L ι - · ^{,, z cnt} ~ stand axis orthogonal swivel axis in a hollow

i £ Sinneeη he MicrSh, i ^ ™ ^ ¹ " ¹ * ' ¹ ""* ^{s kti} ^ 12 on the crank pin 4 or, on the Middle A

b itm duX ^ m _nr wrd ° «T ^Sl 'i ?. ^erh ₁ ⁿ ' ^sh - ^B " ^r - pivotable as well as its own axis 11

O ^ ¹ ^ EioSe currently Tem "KrSSösmiti ITF" TJ Tf ""? '"V" ^ * ^ ^ * 7

«I.nl-i rl ^ r Uohll-nhi ,? πι ™ ■. mungsnuttd- Ixlzapten4, this pivoting is essentially

he Ln ve c ^ ~ '"'" ^ ¹ " ⁶ " ^{chcn unltr cinei} » ^Winkd " ™ ⁴⁵ ^ Axis- der

χ Ηι'πΓηργ, γΓ H ^M ° 8 ^llch J ^CIlc n ^d < ^r further io crankshaft 1 or, to the level of the crank pin

ί IH 2 ^g MÖPr / nkp ^U , ^nS r ^gC T ^Cn , ^Vornchlun B · ^S » t ™ 4 connected cheek 13. The pivoting swivel

f ^L n that the S ^ v '" ^{arrangement ng S} ° ^{ZU trcf} - β""«^'" ¹ S ^{1 in the} exemplary embodiment around a Lacer-

.1 ^ i, r ^a " ^z * ci d.ani _e tral opposite bolts as pivot axis 14. The oscillating movement

TuJ _n Z ren \ M 'Mt "'? ^{Uil! Cr} '^' ^ ^iÜC ^ ^crM & ^by moving around the bearing.an.e 15. to hearbei- _1S which is part of the grindstone holder 10 and in a .enden crank pin or M.ttcllagcr associated bearing plate 16 on the grindstone holder 10 used is, and are connected to a gcmcnsamcn drive for the oscil- I _m embodiment and according to the preferred Auslionsbcwegung. Thus, at the guide of the invention has the tripod 5 at a crankpin or a d.ebe.den opposite Hohlfcchfe at a central location, always two diametrically opposite sides ,, ^ Licl.zc, -. grindstone holder _in 1θΓ the two grindstone ^{be NRBC 'tet werdcn} · ^{DL' r} OszLilationsantneb consists halier 10 the two delimiting grooves 12 on the practical part of a rotation motor mn crank pin 4 or middle part ₂ to be machined are eccentric and attached to the eccentric drive the fi ... 4. closed spring-loaded lever arms of the grinding i _m embodiment, these two Schleifstcinstemhalter Due to the spring load can mc1>, ₅ hold. 10 to a common drive 17 for the Osdic whetstones to match the shape of the flutes. cilatory movement connected. This common Dabe, consists of the Moghchken, the An, Mdnung S ₁₁ to Anuieb for the Osyillationsbeweuun, k-teht au. ircften. that the umbrella holder has a common. a rotary motor 18 with l ^ nu-rahineb 19 acting on the lever arms of the grindstone holder and attached to the eccentric drive 19. χ have on loading spring. For the Sehwenkbewe- 30 the Sehleifsteinhalter 10 ah.eVmkelten levering one will generally use the grindstone holder arms 20. The two lever arms 20 are there to equip with adjusting cylinder piston arrangements. Uu ₁ J ₁ eme common loading spring 21 load! In the following, the invention is based on a and uecen der, Ex / enterabtneb 19 des Rotaüonsmc, -lled.ghch an exemplary embodiment portraying gate. ₃₅ 1 beispielswefse an air motor or hydraulics displayed shear Motor be F "ÜR the already mentioned Schwiiu-F 1 g. In perspective a view of a inventions bewcming, the di .: Schleifsleinhaller 10 with the dungsgemaßen device grindstones 6 in d ^ fillet 12 pivots,, st Fig. 2 is a section in direction a -A through which a Siellzylinderkolbenanordnuim 22 xoruesehen. an article according to Fig. 1, _{40] m, lk, g} i _{cichzcitip laundri} hrcnd of Bearbcitangsx ^ r-Fig. 5 a with respect to the F 1 g. 1 and 2 essential _; ii "the necessary pressure force is generated," I enlarged section of the object.

Fig. 4 shows a section in the direction BB through the working crankshaft 1

Item according to F1 g. 2. _{45 βιΊ} · _dcr device according to the invention CrI ₁₁ IgI die

The one in the. The device shown in the figures serves as an oscillating movement in the plane of the

the surface grinding of crankshaft radii that are assigned to the fillet 12.

lenl. In its basic structure, the crankshaft 1 rotates at the same time, which means that the

Device from the machine frame 2 with a rubbing result, a surface treatment arises that.

ment 3 for clamping the crankshaft 1. It is particularly important if it is used as a precision machining in the

Furthermore, in the exemplary embodiment, it is a microfinish or superfinish machining

A plurality of stored on the machine frame 2, has been carried out on device. ensures that in the

fatigue fractures no longer occur on the crank pin 4 to be machined. -

And with the crankshaft 1 moving Vn in a simple manner, the V01 according to the invention

Tool holders 5, in which grindstones 6 are attached 55 helium with their tool holder aV the crank

Ind. The connecting rod-like movement is possible because pin 4 of a crankshaft 1 to be machined is

to be able to set this tool holder5 on special handlebars7 and to ensure that the

the machine frame 2 are connected. Dab -.- i crankshaft 1 equally ^ on by itself in the Lauerfuß 9

2 slides 8 of the Werl.zeugha! ' ^? heats up, can be special

be that the tool holder 5 in vertical and or 6- LciMüeke with de ih ^ lmi-s.iem,: ^ - n device

horizontal direction so that \ eil-iindcn scm.

one and the same device for processing \ o: i I -ic ■. ■ ifinilim _i is " _l :: h.; i.'u- Vonielmmg is on the example

different crankshafts I are used h ■ Ik, 1; Heiiimu of the fillets, .11 a crank

can. According to the invention, the V-, ei kz- ^ i: s: i \ , ipi -.,; ,, hen bes ('-! rather, you would.

ter5 from a stable, with; mf (! en Km -belzapü :

put on 1 agcrfuß 9 and at least one in the Mitie,!, i ^ -i einselzbai. '

For this purpose 4 sheets of drawings

Claims (5)

Patent claims: 1. Device for surface grinding of crankshafts, consisting of a machine frame with device for clamping the crankshaft and drive for the clamped Crankshaft and at least one mounted on the machine frame on the one to be machined Tool holder placed on the crankshaft and moved like a connecting rod with the crankshaft, in the at least one oscillating grindstone holder with grindstone is attached, the tool holder has a stand with a bearing foot placed on the crankshaft, characterized in that that the or each grindstone holder (10) parallel to the stand of the tool holder (5) arranged and around a pivot axis (14) orthogonal to the stand axis into a Hollow throat (12) on the crank pin (4) or on the center bearing can be swiveled in and also - as ao known per se - oscillating about its own axis (11) assigned to the flute center is or are drivable. 2. Apparatus according to claim 1, characterized in that the stand on two diametrically opposite sides each have a grindstone holder (10) that delimit the two Hollow fillets (12) assigned to the crank pin (4) or central bearing to be machined and to one common drive (17) for the oscillating movement are connected. 3. Device according to claims 1 and 2, characterized in that the oscillation drive d ^ r (17) from a rotational motor (18) with an eccentric drive (19) and to the eccentric output (19) connected spring-loaded lever arms (20) the grindstone holder (10) exist !. 4. Device according to claims 1 to 3, characterized in that the loop [stone holder (10) a common loading spring acting on the lever arms (20) of the grindstone holder (21) have. 5. Device according to claims 1 to 4, characterized in that the grindstone holder (10) are equipped with cylinder piston assemblies (22) for the pivoting movement.