US3165983A

US3165983A - Cylinder block constructions and methods and apparatus for making same or the like

Info

Publication number: US3165983A
Application number: US140111A
Authority: US
Inventors: Jesse B Thomas
Original assignee: Reynolds Metals Co
Current assignee: Reynolds Metals Co
Priority date: 1961-09-22
Filing date: 1961-09-22
Publication date: 1965-01-19
Anticipated expiration: 1982-01-19

Description

Jan. 19, 1965 J. a. THOMAS 3,165,983

CYLINDER B K CONSTRUCTIONS ME 5 AND APPARAT FOR MAKING SAME THE L Sheets-Sheet 1 Filed Sept. 22, 1961 JNVEVTOR. JESSE 8. THOMAS HIS ATTORNEYS Jan. 19, 1965 J. B. THOMAS 3,165,983

CYLIN BLOCK CONSTRUCTIONS AND METH AND AP ATUS FOR MAKING SAME OR THE KE Filed Sept. 22, 1961 3 Sheets-Sheet 2 s M m m w m m c m in I w. B c m m mm 2, 2 r m 5 4 g {v ll MW a I N i H fifi M l JP fl C ,M H W 1 o -q 2 LO% 0 2 5 a w m uv n, w M k M w C I, u L 'lll "L7, 6 5 ll lb I 4 F JFG w 2. i r

Jan. 19, 1965 J. B. THO

' CYLINDER BLOCK CONSTRUCTI MAS ONS AND METHODS'AND APPARATUS FOR MAKING SAME OR THE LIKE Filed Sept. 22. 1961 3 Sh eets-Shee t 3 INVENTOR. JESSE B. THOMAS H S ATTORNEYS United States Patent CYLINDER BLQCK CONSTRUCTIGNS AND METH- ODS ANI) AFPARATUS FOR MAKING AME GK THE LIKE Eesse B. Thomas, Iiemico (Jonnty, Va, assignor to Reynolds Metals Company, Richmond, Vin, a corporation of Delaware Filed Sept. 22, 1961, Ser; No. 1%,111

15 Claims. (Cl. 92-469) This invention relates to improved cylinder block constructions or the like and to improved methods and apparatus for making such cylinder block constructions or the like.

It is well known in the art that cylinder blocks for internal combustion engines and the like have been formed by casting or otherwise surrounding cylinder block material, such as aluminum-containing metallic material and the like, about one or more cylinder-defining members formed of steel or the like whereby the cylinder-defining members are formed of wear resistant materials and the remainder of the cylinder block construction is formed of good heat conducting and light-weight materials. The cylinder block material is usually bonded to the cylinderdefining members or mechanically locked thereto.

However, it has been found that such prior known bonding or mechanically locking means are inadequate and the cylinder-defining members tend to readily break loose from the cylinder block material during continued use of the cylinder block constructions. Such cylinder block failurc is particularly aggravated when he cylinder-defining members are formed of one aluminum alloy and the cylinder block material is formed of another aluminum loy.

According to the teachings of this invention, however,

an improved cylinder block construction and method and apparatus for making the same areprovided wherein the cylinder-defining member or members thereof are firmly secured to the cylinder block material regardless of the combination of materials utilized and will not tend to ICE.

Such cylinder-defining members are telescoped over suitable mandrels disposed in a mold chamber of a mold device whereby the rnolten cylin der block material can be subsequently disposed in the mold chamber. and's'urround the cylinder-defining members. 7

There after, either the mold deviceor the cylinder-defining members are vibrated, preferably by ultrasoniovibrating means, in such a manner that fusion or-welding is ef-' fected between the cylinder block material and the cylinder-defining members at the flanges of the cylinder-defining members, such fusion or welding not only taking place at the tips of the flanges of the cylinder-defining members but even extending into the valleys between adjacent flanges.

In this manner, the cylinder-defining members of the resulting cylinder block construction are metallurgically bonded to the cylinder block material and cannot readily break loose from the subsequently solidified cylinder block material;

Accordingly, it is an object of this inventionto provide an improved cylinder block construction having oneor more of the novel features set forth above or hereinafter shown or described.

Another object of this invention is to provide an improved method for making such a cylinder block construction or the like. I

A further object of this invention is to provide an improved apparatus for making such a cylinder block construction or the like. 7

Other objects, uses, and advantages of this invention v are apparent from a reading of this description, which proceeds with referenceto the accompanying drawings forming a part thereof and wherein:

break loose through continued use of the cylinder block construction.

In particular, one cylinder block construction of this invention includes a cylinder-defining member having a plurality of outwardly tapering flanges extending from the exterior thereof, each flange tapering to a point like tip means or both, the tips of the flanges of the cylinder-defining member are melted and fused with the cylinder block material to form substantially homogeneous structures at the ends of the flanges of the cylinder-defining member. The cylinder block material is also bonded to the coating on the flanges of the cylinder-defining member from the fused tips thereof toward the bases of the flanges. Thus, the cylinder block materialbecomes metallurgically bonded to the cylinder-defining member in such a manner that the cylinder-defining member cannot readily break loose from the subsequently solidified cylinder block material.

Another cylinder'block construction of this invention is formed from one or more or" the aforementioned cylinderdefining members except that the cylinder-defining member or members are not covered by the aforementioned coating.

FIGURE 1 is'a schematic, flow diagram illustrating one 1 method of this invention for forming an improvedcylinder' block construction of this invention.

FIGURE 2 is an enlarged, fragmentary, perspective I FIGURES 5 and 6 are fragmentary,cross-sectional views similar to FIGURE 4 and illustrate various stages in the method of bonding the cylinder block material to y the cylinder-defining member of this invention.

'- FIGURE 7 is an enlarged, fragmentary, cross-sectional View of the completed cylinder block construction of this invention and is taken substantially on line 7-7 of the right-hand terminal view of FIGURE 1. 7

FIGURE 8 is a schematic cross-sectional view illustratingthe method and apparatus of this invention for forming another cylinder block construction of this inven' tion.

FIGURE 9 is an enlarged, fragmentary, cross-sectional view illustrating the cylinder block construction formed by the method and apparatus of FIGURE 8.

f FIGURES 10-l2-are views similar to FIGURE 8 an illustrate other embodiments of the method and apparatus of this invention.

members of this invention. V

While the various features of this inventionare herein after described in connection with a' cylinder block conaisssss struction for an internal'combustion engine or the like,

I it is to be understood that any other desired structures can be secured together by the methods and apparatus of this invention to produce ardesired construction. Therefore, this invention is not to be limited to only the applications thereof illustrated in the drawings, as the drawings are merely illustrative of one of the wide variety of uses of this invention.

" and disposed flush with the outer ends 34 of the main Referring now to FIGURE 1, one of the methods of i this invention for forming a cylinder block construction or the like is schematically illustrated and comprises the following steps.

As illustrated at station in FIGURE l, a length of cylinder-defining member stock 11 is extruded by a conventional extruding apparatus 12. The extruded stock 11.

is subsequently cut at station 13 into a plurality of cylinder-defining members 14 of the desired length and ma chined to any desired degree. Thereafter, each cylinderdefining member 14 is coated at station;15 by a suitable material that bonds itself to the exterior surface of the cylinder-defining member 14 and is adapted to be bonded to the desired cylinder block material. The thus coated cylinder-defining members 14 are disposed in-asuitable cylinder block mold device 16 at station 17, the cylinderdefining members 14 being placed over suitable, heatable mandrels 18 disposed in the mold chamber 19 of the mold device 16; Thereafter, the desired 'cylinder block mate- 'rial 20 is 'dispen'sedfrom suitable apparatus 21 into the mold chamber 19 of the mold device 16 to be cast around the cylinder-defining members 14 and be metallurgically bonded thereto in a manner hereinafter described. After the cylinder block material 20 has solidified, the resulting cylinder block construction 22 is removed from the mold device 16 and suitably machined, if required, at station 23 to form the completed cylinder block construction 22.

The cylinder-defining members '14 can be'formed from any desired material or combination of materials, and, in the embodiment illustrated in the drawings, the cylinderdefining members 14 are formed from'anextrudable high silicon aluminum-containing metallic material which" is particularly adaptable for forming awear-resistant cylinder-defining structure for an internal combustion engine or the like. However, the cylinderdefining members 14 can be formed'frorn copper or magnesium alloy, if-desired. As illustrated in FIGURE 2, each extruded cylinderdefining member 14 comprises. a main cylindricalbody portion'24 having a cylinder bore 25 passing therethrough;

A plurality of outwardly tapering, radially disposed flanges l or fins 26 extend longitudinally from the exterior surface 27 of the main body portion 24 of the cylinder-defining member 14. -Each flange 26 has a pair of opposed side '

walls

28 and 29 which converge from the base 30 of the respective flange '26 to the tip or outer end 31 thereof. While the opposed '

sides

28 and 29 of each flange 26 are illustrated asvconverging together to form a knife-edgelike tip 31 and defining-a triangular cross-sectional configuratioruit is to be understood that the opposed sidesZS and 29 of each flange 26 can define any desired crosssectional'configuration whereby' the tips 31 of thefianges v pared to the cross-sectional widths of the bases 3tl'thereof,

for a purpose hereinafter described.

At the time ofcasting, these small areas are melted away; thus assuring a'metallurgical bond. The degree of metallurgical bond obtained is controlled by the initial 1 temperature of the finned cylinder-defining member :14

body portion of the cylinder-defining member 14.

. When the cylinder-defining members 14 are formed from the'extruded stock 11, the cylinder-defining members 14 can be cut fromthe stock 11-and subsequently coated by a suitable bonding material 35, FIGURE 4,

at station 15, FIGURE 1, the thickness of the bonding material 35 beingygreatly exaggerated in the drawings.

. Alternately, the extruded stock 11 can be coated with the bonding material 35 immediately after the stock 11 has been extruded by the apparatus 12. Thereafter, the ,cylinder-defining members 14 can be subsequently cut from the coated stock 11 when needed.

As previously stated, the bonding material 35 must be of a type which will readily bond to the exterior surface of the cylinder-defining member 14 and also-be adapted to be bonded to the cylinder block material 20 in a manner hereinafterdescribed. It has been found that when the cylinder-defining member 14 is formed from the aforementioned aluminum-containing metallic material,

zinc, silver, molybdenum, tin, indium, or copper form suitable bonding materials 35 for subsequently bonding an aluminum-containing metallic cylinder block material '20, such as aluminum alloy 13, to the aluminum cylinderdefining member 14.

.When the; bonding material 35 is formed from zinc,

1 and the cylinder defining member 14 is formed from'an understood that the cylinder-defining members 14 can 7 be formed by a casting operation, if desired. However,

it has been found less expensive to extrude the cylinderdefining members 14 than to cast the same. Therefore, the flanges 26 are designed to run longitudinally relative to the cylinder-defining members 14 to accommodate such extrusion operation. It is to be understood, how ever, that the flanges 26 can be disposed in any desired position around the outer peripheral surface 27 of the cylinder-defining member 14.

For example, as illustrated in FIGURE 3, the outwardly tapering flanges'26 of the cylinder-defining member 14 of this invention are disposed circumferentially therearound and function in the same manner as the flanges 26 of the cylinder-defining member 14. Since the cylinderdefining member 14, cannot be extruded, the same can be formed by any suitable casting operation or the like.

' 26 have relatively small cross-sectionalwidths, as com- In particular, the cylinder-defining member can be die cast, permanent mold cast, or sand cast. Further, the cylinder-defining member 14' can be formed by sintering aluminum alloy particles together with or without Wearresistantiron pellets or the like.

After the coated cylinder-defining members 14 have been provided, the same are disposed over the mandrels 18 in the mold chamber 191 of the mold device 16, the

' mandrels 18 preferably being heatable' to desired temand thetemperature of the molten aluminum, or other molten metal,'which is cast around the cylinder-defining] member 14. a

If desired, the opposed endsof the flanges 26 of each cylinder-defining member 14 can be cut away, asat 32, to

provide a mechanical locking eifect of the cylinder-defin- A ing member 14 with the cylinder block material 28 when the cylinder. block material ,20 is cast over theends 33 peratures to supplement the temperature of the molten cylinder block material 20 in forming the subsequent metallurgical bond between the cylinder-defining members 14 and the cylinder block material 20.

While the cylinderblock construction 22 illustrated in 7 FIGURE l is illustratedashaving four cylinderdefining members 14 provided therein, it is to be understood that the cylinder-block construction 22 could have one or any cylinder-defining members 14,-as de- 7 desired number of sired.

As illustrated in'FIGURES'l and 5, the molten block material 20 'is cast around the coated cylinder-defining members 14, and the heat ofthemoltencylinder block as the flanges 26 tend to heat up from the tips 31 thereof toward the bases 30, the cylinder block material becomes bonded to the coating 35 inwardly from the tips 31 toward the bases 36 as schematically illustrated in FIG- URE 7.

Further, as the relatively narrow tips 31' of the flanges I 26 are heated, the same tend to melt in the manner illustrated in FIGURE 7, to fuse with the coating 35 and molten cylinder block material 20 to provide substantially homogeneous metallic structures 36 at the free ends of the flanges 26. In this manner, the homogeneous structures 35 metallurgically bond the cylinder block material 2% to the cylinder-defining member 14. Because the molten cylinder block material 20 cools or solidifies at a relatively rapid rate, such melting of the flanges 26 takes place only at the tips 31 thereof. However, the

heat provided by the molten cylinder block material 20, V

with or without the heat supplied by the mandrels 18, is sufficient to cause the cylinder block material 20 to bond to the coating 35 from the fused ends 36 of the flanges 26 toward the bases 30 thereof. The extent to which the cylinder block material 20 is bonded to the coating 35 of the cylinder-defining members 14 throughout the length of the flanges 26 depends on how long and to what temperature the flanges 26 are heated, such factors being controlled by the heatable mandrel 18 and the tempera:

ture of the poured metal.

However, it has been found that when the tips 31 of the flanges 26 of the cylinder-defining member 14 are fused to the cylinder-block material 26 in the manner previously described to provide the metallurgically bonded homogeneous structures 36, a suflicient amount of the coating 35 on the flanges 26 is bonded to the cylinder block material .20 from the fused, ends of the flanges 26 toward the bases 30 thereof to provide a good bond between the cylinder block materialZti and the cylinder-defining members 14. V

Therefore, not only has. it been found that such metal- 7 lurgical bonding method produces a cylinder block con other cylinder block construction 4l of this invention which is illustrated in FIGURE 9, the cylinder block construction 40 comprising one or more cylinder-defining members 14 metallurgically bonded to the cylinder block material 20' in a manner hereinafter described.

As illustrated in FIGURE 9, the exterior surfaces of the cylinder-defining members 14 are not covered with the coating 35 previously described and are fused or metallurgically secured to the cylinder block material 2%) not only at the tips 31 of the fins 2s thereof but also at the bases 30 of the fins '26 and in the vafleys 41 between adjacent .fins 26 whereby the cylinder-defining members 14 will not readily break loose from the cylinder block material 20 during subsequent use of the cylinder block construction 40.

The cylinder-defining members 14 and cylinder biock material 20 of FIGURE 9-are metallurgically secured together by the method and apparatus ofFIGURE 8 in the manner nowto be described. 7

As illustrated inFIGURE 8, a suitable m'old device 42, similar to the mold device 16 previously described,;has

. a mold chamber 43 adapted to receive one or'more cylinvention are cooler during operation thereof than prior 7 known constructions, because the cylinder block material of the cylinder biock constructions of this invention readily conducts the heat away from the cylinder-defining members thereof.

While any number of flanges 26 may be provided on each cylinder-defining member 14, it has been found that the greater the number of flanges 26 provided, the greater 7 the surface area provided for such bonding operation.

After the cylinder block construction 22 has been formed in the above manner, the same is removed from the molding device 16. Thereafter, the cylinder block construction 22 can be suitably machined to provide air der-defining members 14 and molten cylinder block material 20 in the manner previously described.

In particular, suitable, heatable mandrels 44, similar to the mandrels 18 previously described, are secured in the proper positions in the mold chamber 43 of the mold device 42 in any suitable manner, such as being bolted therein by bolts 45 or the like, whereby the cylinderdefining'members 14 are adapted to be respectively telescopically disposed over the mandrels 44 and'be properly positioned in the mold chamber 43 of the mold device 42. 7 After the cylinder-defining members 14- have been so positioned in the mold device 42, molten cylinder block material 20 is poured into a mold chamber 33 to surround thecylinder-defining members 14 and be metallurgically l bonded thereto by an ultrasonic welding operation.

The ultrasonic welding operation is provided by ultrasonically vibrating either the mold device 42 or the cylinder-defining members 14 as the molten cylinder block material 20 is being poured into the mold chamber 45,

whereby the cylinder block material 29 is welded or fused In this manner, the current supplied by the alternator '48 passes through the crystal 46 and causes the same to vibrate in the desireddirection, depending upon the particular cut of the crystal. 46, whereby the vibrations produced by the crystal 46 are transferred to the mold device 42 by a suitable connecting rod 51 secured to the plate 47 at one end 52 thereof and to the mold device 42 at the end 53 thereof While the crystal 46 and alternator 4-8 can be designed in any manner well known in the artto cause vibrations at any desired frequency, it is preferred that the crystal 46 vibrate at a'frequency greater than 20 kilocycles so as to be beyond the audio frequency range, although lower frequencies would work, such as 10 kilocycles or: the like.

Preferably, the rod 51 is formed from a low heat conducting material such as a high nickel or chromium steel,

' interposing suitable insulatingme'ans 54 between the sup p'orting plate 47 and the end 52 of the rod'SlL. .Alternatej '14 by the mandrels 44c. 7

Therefore, it can be seen that various means havebeen provided for either vibrating the mold device. or "the e cylinder-defining members to effect ultrasonic welding 101' By thus Vibrating the, mold device 42 at the ultrasonic frequencies produced by the crystal 46, it has been-found that the cylinder block material 20 .will be completely fused or welded to the 'fins 2 6 of the'cylinder-defining members 14 without utilizing the previouslyfmentioned coating 35 on the cylinder-defining,members 14, although the cylinder-defining members 14 and'cylinder block ma terial 20'are formed fromdissimilar or similar aluminum alloys or thelike.

However, it is to be understood that the cylinder-defining members 14- can be covered with the coating 35 whereby the cylinder block material 20 will be welded or fused to-the coating 35 inrthe above manner when the mold device is vibrated.

While the vibration transfer rod 51 is illustrated in FIGURES as being attached externally to the side wall a of the molddevice 42, it is to be understood that the same can be attached to the mold device 42 in any desired position, such as to the bottom Wall thereof, if desired,

'to produce the aforementioned Welding or fusion operation.

Further, the vibration transfer rod 51 can be attached a to the internal surface of the mold device 42, if desired. a For example, the vibration transfer rod 51a of FIGURE is secured to the inside surface of the side wall of the mold device 42a and is vibrated in the above manner to produce the welding or fusing operation. In the embodiment illustrated in FIGURE 10, the vibration transfer rod 51a is formed of any suitable material that is able to withstand the heat of the molten cylinder block material which is poured into the mold device 42a and which will not be fused or otherwise secured to the cylinder block material 20 whereby the subsequently formed cylinder block construction can be readily removed from the mold V device 42a.

As previously stated, thecylinder-defining members 14 'and cylinder block material 20 can 'be ultrasonically welded or fused together by either vibrating the mold device 42 of FIGURE 8 or the cylinder-defining members 14 thereof. 7 V

One means for vibrating the'cylinder-defining members 14, rather than directly vibratingthe mold device 42, is illustrated in FIGURE 11 wherein each mandrel 44b has a piezoelectric crystal 4eb mounted on the upper end thereof and secured thereto by suitable bolt's offastening means 55 passing respectively through the mounting plates 47b and the mandrels 44b. Preferably, the crystals 46b and supporting plates 4717 are electrically and thermally insulated from the mandrels 44b by suit'able insulation means 56 interposed therebetween;

In this manner, the vibrations of in FIGURE 9. a

If desired,.the vibratingmeans can be mounted directly in the mandrels 44. For example, as illustrated in FIG- URElZ, the'crystals 46c and supporting plates 470 are respectively received in suitable cavities respectively provided 1n the mandrels 44c and are electrically and thermally insulated therefrom by suitable insulation means 57.

because thecylinder-defining members are metallurgically bonded to the cylinder block material and will not readily v break loose therefrom, as in the prior art.

While piezoelectric crystals have been illustrated in the drawings as providingfthe means for vibratingthe mold deviceor cylinder-defining members, it is to be u'nder- .stood thatother vibratingmeans may be utilized, as

desired. 7

It has been found that not only does the ultrasonic vibrations-cause fusion or welding between the cylinderdefining members 14 and cylinder block material 20, but

, also the ultrasonic vibrations improve the physical properties of the resulting casting by reducing the growth of 7 large crystals and retards alloy segregation.

While it"is not illustrated, it is to be understood that the vibratory rods interconnecting the ultrasonic transducers with the various mold devices could be cooled in any desired manner.. For example, the vibratory rods can be cooled by circulating a heat exchange media through the interior of the rods.

Returning now'to the features of this inventionlconcerning the coating of the exterior of the cylinder-defining members: 14 of FIGURE 1,.it has been found that'the cylinder-defining members 14 can berzincated to provide the coating for the above purpose.

In particular, each cylinder-defining member 14 is first caustic etched and' rinsed. Thereafter, each cylinderdefining member 14 is deoxidized and rinsed. The de-' oxidized and rinsed cylinder-defining member 14 is'then dipped in a zincate solution:for approximately thirty seconds and then rinsed. Subsequently, the zincated cylinder-defining member 14 is dipped in a nitric acid solution of approximately 50% concentration for approximately ten seconds.

Thereafter, the zincated cylinder-defining member 14is again dipped .into a zincate solution for approximately thirty seconds and then rinsed to complete the zincating process.

' It has been found that the zincate solution can consist of 100 grams of zinc oxide and 525 grams of caustic per liter of water. Optionally, a small percentageof half ,and half Rochelle salts and ferric chloride can be added to the zincate solution.

This-zincating process produces a superior zinc coating 35 on the cylinder-defining members 14 and can'be economically automated.

p The thus zincated cylinder-defining members 14 can be utilized in any ofthe above methods to produce the desired cylinder block constructions or the like.

i In addition, it has been found that the cylinder-defining members 14 can be formed by the method and apparatus 58 illustrated in FIGURE 13.

'In particular, a cylinder-defining member 14 is formed by casting the desired metallic material 59 in asuitable 1 mold device 60, the mold device 60 being so constructed and arranged that the same will produce the longitudinally disposed of circumferentially disposed fins 26 or .26 on the exterior surface of. the cylinder-defining member I 14 during thecasting operation.

Thus, thevibrations produced from thecrystals' 46; are

respectively transferred to the cylinder-defining members fusion between the cylinder-defining members and the cylinder block material, whereby the resulting cylinder block construction is a substantially unitary structure p A mandrel 61 is disposed in thecentral portion of the mold device 60 and cooperates therewith to define the central bore 25 passing through the cylinder-defining member 14.

If desired, suitable thin, disc-shaped permanent or '7 electric magnets can be incorporated in the mandrel 61 to hold in position a proper amount of iron particles 62 or the like that will subsequently line the'interior surface of the cylinder-defining member 14 to provide a wear-resistant surface. V 7

For example, the iron particles 62 can 'be disposed around the mandrel 61 and will adhere thereto in the proper thickness because of the aforementioned magnets, Thereafter, themolten metallic material 59 is cast into the molddevice whereby the layer of iron-par ticles '62 are cast in the molten'metallic material 59 and form the interior surface thereof.

' 1 wherein said coating is zinc.

The resulting cylinder-defining member 14 can be utilized in any of the above procedures to form the desired cylinder block construction or the like.

While there are many ways to produce the cylinderdefining members 14 by extruding the same, it is desirable to prevent the exterior surface thereof from oxidizing before the cylinder-defining members 14 are covered by the aforementioned coating 35.

One such method would be to surround the extruded stock 11 as it leaves the extruding apparatus 12 of FIG- URE 1 with an inert gas shield whereby no oxidation of the aluminum-containing extruded stock 11 can take place.

While the extruded stock 11 is surrounded by the inert gas shield, various metals can be sprayed'cr impinged upon the exterior surface of the extruded stock 11 to form the aforementioned coating 35.

Another such method is to extrude the stock 11 directly into a molten bath of zinc or the like as it leaves the extruding apparatus so that the aforementioned coating 35 can be formed on the extruded stock 11 before the same is exposed to the atmosphere and oxidizes.

For example, see FIGURE 14 wherein the extruding appartus 63 has the extruding end thereof forming one side of a container 64 carrying a molten bath 65 of zinc or. the like. 7

In this manner, the stock 11 is directly extruded into the molten metal bath 65 as it leaves the extruding 8. A cylinder block construction as set for in claim 1 I wherein said coating is indium.

9. A cylinder block construction as set forth in claim 1 wherein said cylinder-defining member is one aluminum alloy and said block material is another aluminum alloy having agreater heat conductivity than the heat conductivity of said cylinder-defining member.

10. A cylinder block construction comprising a cylin- V der-defining member having a plurality of outwardly tapering fins extending from the exterior thereof, a coating of bonding material disposed on the exterior surfaces of said fins, and cylinder block material surrounding said cylinder-defining member and being bonded to said fins by said. coating from the tips'of said fins toward the bases thereof, said cylinder block material and said'tips of said fins being fused to provide substantially homogeneous structures at said tips of said fins. 11. A cylinder block construction comprising a cylin der-defining member having a plurality of outwardly tapering fins extending from the exterior thereof, and

cylinder block material surrounding said cylinder-defining member and being bonded to said fins from the tips of apparatus 63 so as to be completely'covered by the coat ing 35 before any oxidation of the exterior surface of the extruded stock 11 can take place If desired, the extruding'apparatus 63 can be tilted in such a manner that the extruded stock 11 passes out of the bath- 65 so as to be subsequently cut into the desired lengths as the stock 11, is bein continuously formed and coated.

' Therefore, it can be seen that there has been provided 7 improved cylinder block constructions and improved methods and apparatus for making the same or the like,

whereby the cylinder-defining members are metallurgically bonded to'the cylinder block material and will not tend to break loose. therefrom during subsequent use of the cylinder block constructions.

While the form of the inventionnow preferred: has 1 been disclosed as required by the statutes, other forms may be used, all coming within the scopeof the claims bonding material disposed on the exterior surfaces of said fins, and cylinder block material surrounding said cylinder-defining member and being bonded to said fins by said coating from the tips of said fins toward the bases thereof, said tipsof said fins and, said coating and said cylinder block material in the region of said tips of said cylinder defined by said member.

said fins toward thebases. thereof, said cylinder block material and said tips of said fins being fused to provide substantially homogeneous structures at said tips of said fins.

' 12. A cylinder block construction as set forthin claim 11 wherein said fins of said cylinder-defining member are disposed'substantially circumferentially relative to' the 13. A cylinder block construction asset forth in claim 11 wherein said fins of said cylinder-defining member are disposed substantially parallel to the longitudinal axis 1 of the cylinder, defined by .said member.

' 14. A cylinder block construction comprising alcylindef-defining member having a plurality of outwardly j tapering fins extending from the exterior thereof, "and cylinder block material surrounding said cylinder-defining .member and being fused with thetips of said fins'lto provide substantially homogeneous structuresat the tips of said fins..

15. A cylinder block construction comprising a cylin- 'der-defining member of one aluminum-containing mate- .r ial, a coating. of bonding material disposed on the exterior surface ofsaid cylinder defining member, and a cylinder block of another aluminum-containing material surrounding said cylinder-definingmember and being bonded thereto by {said coating.

fins being fused to provide substantially homogeneous structures at said tips of-said fins.

2 A cylinder block construction as set forth in claimi 1 wherein said cylinder-defining member is an aluminum Y alloy.

4. A cylinder block construction as set forth in claim 3. A cylinder block construction as set forth in claim 1 wherein said block material is an aluminum alloy.

l wherein said coating is silver.

na in ci ed in the file or this patent UNITED. STATES PATENTS I I j Salisbur itm 1e 17, 1902 881,584 Hoifrnan Mar. 10,1908

1,528,947 7 Preston L Mar. 10, 1925 I 1,594,446 Boegehold Aug. 3, 1926 1,807,689 .Deputy IuneZ, 1931 1,902,350 Whitakerf Mar. 21, 1933 2,062,394 Brown Dec. 1,-1936' 2,327,259 Gay Aug. 17, 1943 2,433,903 Hensel e Jan. 6, 1948 2,475,396 r Lester July 5-, 1949 2,511,068

Kai1 'Iune13 1950'

Claims

1. A CYLINDER BLOCK CONSTRUCTION COMPRISING A CYLINDERDEFINING MEMBER HAVING A PLURALITY OF OUTWARDLY TAPERING FINS EXTENDING FROM THE EXTERIOR THEREOF, A COATING OF BONDING MATERIAL DISPOSED ON THE EXTERIOR SURFACES OF SAID FINS, AND CYLINDER BLOCK MATERIAL SURROUNDING SAID CYLINDER-DEFINING MEMBER AND BEING BONDED TO SAID FINS BY SAID COATING FROM THE TIPS OF SAID FINS TOWARD THE BASES THEROF, SAID TIPS OF SAID FINS AND SAID COATING AND SAID CYLINDER BLOCK MATERIAL IN THE REGION OF SAID TIPS OF SAID FINS BEING FUSED TO PROVIDE SUBSTANTIALLY HOMOGENEOUS STRUCTURES AT SAID TIPS OF SAID FINS.