US2268949A

US2268949A - Die casting machine

Info

Publication number: US2268949A
Application number: US300742A
Authority: US
Inventors: Albert F Lehmann
Original assignee: Individual
Current assignee: Individual
Priority date: 1939-10-23
Filing date: 1939-10-23
Publication date: 1942-01-06
Anticipated expiration: 1959-01-06

Description

Jan. 6, 1942. A. F. LEHMANN DIE CASTING MACHINE Filed Oct. 23, 1959 5 Sheets-Sheet l NN Kw2 3 nventor Jan. 6, 1942.

A. F. LEHMANN DIE CASTING MACHINE 5 SheeJcs-Sheet 2 Filed 0G11. 23, 1939 llllll |l|l l Illl .f

Jan. 6, 1942. A. F. LEHMANN DIE CASTING MACHINE Filed 001;. 23, 1959 5 sheets-sheet 3 QN WN 5 Sheets-Sheet 4 l l l I I Jan. 6, 1942. A. F. LEHMANN DIE CASTING MACHINEv Filed Oct. 25, 1939 Jan. 6, 1942. A. F. LEHMANN 2,268,949

DIE CASTING MACHINE Filed Oct. 23, -1959 5 Sheets-Sheet 5 Gttornegs Patented 6, 1942 I A' UNlTEb f STATES 1PA-'nam'l OFFICE ma cAs'rlNo MACHINE Alben F. uhmm, Detroit. Mien.

Application october za, i939. sei-m Nn. 30am v claims., (ci. zz-sz) This invention relates generally to die casting and molding machines.

It is an object of the present invention to provide a rrew and improved die casting and molding machine of a structural character such that substantially perfect castings may be made. v

Another object ofthe invention is to provide a new and improved die casting and molding machine in which a pair of separable dies are positively held against separation during the casting operation. g

A further objectof the invention is to provide a die casting and molding machine of new and improved construction to withstand the stresses and strains accompanying operation of such mashines.

A still further object of the invention is to provide a die casting and molding machine hav- `ing a supply of liquid casting material in which automatic die charging apparatus is disposed and arranged to be moved out of the supply between extended periods of operation to avoid damage to the charging apparatus by contraction and expansion of the casting material.

Other objects of the invention will become apparent from the following detailed description taken with the accompanying five sheets of drawings in which- Figure 1 is a top plan view of a die casting machine embodying features of my invention;

Figure 2 is a side view shown in elevation of the die casting machine; l

Figure 3 is a view shown in section taken longitudinally of the machine along the line and in the direction of the arrows 3--3 of Fig. 1;

Figure 4 is a view shown in section taken longitudinally of the machine along the line and in the direction of the arrows 4-4 of Fig. 1;

Fig. 5 is an end view of the machine looking from left to right of Fig. 2;

Fig. 6 is a view shown in cross section of the;

machine, taken along the line and in the direc tion of the arrows 6 6 of Fig. 2;

Fig. '1k is a view similar to Fig. 6 but taken along the lineA and in the direction of the arrows 'I--l vin elevation and partly `in cross section, taken along .the line and in the direction of the arrows 9 3' of Fig. 2;

Fig. 10 is a fragmentary view of the machine shown in cross section, taken along the line and in the direction ofthe arrows IO-IO ol Fig. 2;

' Fig. 11 isv a view of the machine shown in cross section, taken along the line and in the direction of the arrows II-I I of Fig. 2;

Fig. 12 is a view of the machine shown in cross section, taken alongthe line and in the direction of the arrows I2'-I2 of Fig. 2;

Fig. 13 is a fragmentary top plan View of the machine shown partly in section, taken along the line and in the `direction of the arrows I3-I3 of Fig. 2, and

. Fig. 14 is a perspective view shown partly in section of a part of the machine.

Referring toythe drawings by characters of reference, the die casting machine includes a base I Il on which is mounted a rigid frame comprising a pair of spaced, parallel, lower side members or rails II, a pair of spaced, upper, parallel side members or rails I2 and opposite end walls I3 land Il. parallel with the lower rails Il and both pair of rails are preferably rectangular in shape. The

end walls I3, Il seat on the lower rails and supgether but, it will be seen that the rails II and I2 because of the shoulders I5, I6 take the longitudinal strains and that the bolts I8 are not under shearing stresses.

The recessed rails together provide a guide or l sildeway and the walls of these recesses are'further recessed to receive hardened metallic strips I9 which may be secured to the railsvby screws 20. On these hardened'slideways, a die carrier member 2I is slidably supported and carries a die member 22 cooperable with a fixed die member 23, the die 23 being rigidly secured to the frame end wall I 4 by screws or bolts 2|.. 'Ihe movable die 22 may be rigidly secured to its carrier 2I by screws 25 or by other suitable means.` I'his carrier member 2|, Fig. 8, comprises four slide rails 26 Joined by a vertical wall 21. to `which the die member 22 is secured and integral -with the wall 21, a tubular portion 28 extending centrally between and longitudinally of the rails 26 is reenforced and joined to the wall 21 by radially spaced webs 29.'

'I'he upper rails I2 overlie and are i Any suitable power means may be employed to move the die member 22 to open and close the die and in the present instance, hydraulic power means is employed. This hydraulic power means comprises a cylinder member mounted in the frame end wall I3 and a piston 3|, the cylinder member 30 being provided with

passages

32 and 33 to effect hydraulic action on opposite sides of the piston. A push rod 34 having one end secured 'to the piston 3| has itsvother end secured to the die carrier member 2|, the rod 34 extending centrally through the carrier tubular portion 28 and being screwthreaded into a detachable member 35 which may be secured by screws or by other suitable means to the end wall 23 of thedie carrier. The cylinder member 38 is screwthreaded into an internally threaded member 38 which is rotatably mounted in the end wall I3 and is rotatable by a hand wheel 31. This provides an adjustment to compensate for dies of different depth or thickness.

Slidably mounted in and adjustable along the frame slideways, is a cam carrier or supporting member 40 which is of general cylindrical shape having a central bore 4I through which the piston push rod 34 extends and is freely reciprocal. In its rear surface, the carrier member 48 is recessed to receive the inner end of `the adjustable cylinder 30, rotation of which adjusts the position of carrier 48 along the slideways. The member 48 is provided with a reduced tubular portion 42 on which is rotatably mounted a tubular member 43 on one end of which lis secured radially spaced cam members 44 providing together an interrupted but inclined cam surface cooperable with an interrupted cam surface on similar cam members 45 which are secured to the rear end of the die carrier 2|, this cam action being provided to close the die tightly and to hold it tightly closed during the casting operation. Rigidly secured to the rear end of the rotatable cam carrier member 43, a gear 48 in mesh with a movable rack 41 provides for rotation of member 43 to close the die tightly and the gear 48 and member 43 are held to the guide and carrier member v4I1 by a retaining ring 48. A l.

As shown more clearly in Fig. 12, the rack 41 is preferably operated hydraulically and to this end is provided with a push rod 48 on the end of which a piston 49 reciprocates in a cylinder 50 having iiuid passages 5|, 52 leading into the cylinder on opposite sides of the piston. In the frame rails I|`and I2, slots 53 extending longitudinallythereof are provided to receive bolts 54 for retaining the carrier member 48 in the desired position of adjustment.'

Carriers

28 and 43 are adapted to telescope, member 28 being provided with longitudinal internal slots 55 and member' 43 being provided with external slots 58 so that member 28 may slide over member 43 when the parts are properly aligned, see Fig. 8. These slotted

members

83, 28 resultin the cooperating cam surfaces on their opposed ends being interrupted, as previously mentioned, the

cooperating cam members

44, 45 being radially spacedbetween the slots and being hardened and rigidly secured to respective ends of the

members

43, 28 by screws or by other suitable means.

Through the end wall of the iixed die 23 and through the adjacent frame end wall I4 are aligning apertures to receive a nozzle 51 for introducing or charging the die with metal for casting. Metal is introduced preferably hydraulically into the nozzle 51 by a second and removable nozzle 58 having a body provided with a cylinder 80 containing a piston 8|. The die charging mechanism is mounted on a base 82 having'a drainage sump 88 for excess metal and positioned in the drainage sump 88 is a second and removable sump 84 wherein ya quantity of liquid metal is kept in which the nozzle 58 is submerged. The metal in the sump or reservoir 84 automatically lls the cylinder 8|) of the nozzle 58 when the piston 8| is retracted such that it opens a submerged inlet passage 82a leading into the cylinder. 'A burner (not shown) may be provided in the sump 83 below the sump 84 to keep the metal therein in a liquid state and at the proper temperature for casting.

The die charging mechanism is preferably hydraulically operated and tothis end includes an open ended fluid tube 85 which is mounted on ybrackets 88a which are rigidly but removably secured to the top of the base 82. Intermediate its ends, the tube is provided with an enlarged portion or what may be termed4 a ilxed piston 88 which is enclosed in a cylinder 81 adapted to move longitudinally ofthe tube. The tube 85 is provided on opposite sides of the piston portion 88 with outlets 88 and 88. The opposite ends of the cylinder are closed by cap members 18 which slidably receive the tube 85 and compress sealing material 1I to provide fluid tight sliding joints. The cylinder 81 is provided with a laterally and downwardly extending rigid arm 13 which extends down into the sump 84 and to which is rigidly secured a pushrcd 14 to which .the piston 8| is rigidly secured. Secured on the top of the base 82, Fig. 10, an adjustable plate 14 cooperates with a downwardly directed extended portion 15 of the cylinder 81 to limit downward swinging movement of the cylinder 81 about the tube 85.

0n the opposite side of the sump from the hydraulic actuator, the nozzle 58 is pivoted on a shaft 18 which is hingedly mounted on top of the base 82 by a bracket 11. Normally, the hinge. as at 18, of the nozzle 58 is rigidly secured to the base 82 by bolts 88 to retain the nozzle rigidly in place in the sump during casting operations. Also, the nozzle 58 is held with its outlet end tightly against the inlet end of the ilxed nozzle 51 by a pair of spaced parallel bolts 8| .which have their inner ends plvoted on shafts 82 mounted in aligned bores which extend through the frame end wall I4 transverse of the machine. The bolts 8| position in upwardly facing senil-cylindrical bores 8Ia in the nozzle body and the free ends of the bolts are threaded to receive nuts 83 which may be tightened down against washers to urge and hold the nozzle 58 against the fixed nozzle member 51. This arrangement provides for easy and ready removal of the nozzle and associated parts out of the metal in the sump so that they will not be subjected to stresses and strains to which they would 'otherwise be subjected by and when the metal is permited to cool and harden. To remove the nozzle member 58 it is only necessary to loosen bolts 8| and remove bolts 88 after which the nozzle may be swung upward out of the sump about the shaft 18. Also, after withdrawing the piston 8| from its cylinder 88, arm 18 of the hydraulic actuator may be swung upwardly abou'A the tube 85 out of the sump.

In operation, assuming the die to be closed, suitable well known controlmeans (not shown) establishes communication between the cylinder 81 through passage 88 and a source oi.' fluid under pressure which causes the cylinder 31 to move along tube 3l toward the die. This moves the piston 8| inwardly, displacing thev liquid metall in its cylinder, causing the metal to flow through nozzle I1 into the die. After the'cast has been made the die-is opened' hydraulically by nrst bringing tluld pressure-to bear on the inner end of-the, piston 49, retracting the rack 41 and rotating gear and cam carrier member I3 until the splines thereon coincide with the recesses v55 of, the ldie carrier member tubular portion 28. vWhen this occurs, the cooperating` cam members will, of course, be disengaged and the die carrier member is free to slide or telescope over the cam carrier 43; Opening movement of the die is obtained by introducing fluid under pressure through passage 33 into the cylinder 3| wherein the pressure will act to retract piston 3|. and through the connecting rod 34`move the die member 23 and its carrier to open position away from the fixed die member 23 after which the finished casting may be removed. On closing the die, iluid pressure acts on piston 3| to move the die to closed position after which :duid pressure acting through the rack 41 and gear 46 rotates member 43 and the cooperating` cam members Il and l tightly close the die and hold it against any slight opening movement during the casting operation so that substantially perfect castings may be made.

While I have shown and described my invent said carrier tion in detail it is to be understood that the same is to be limited only by the appended claims for many changes may be made without departing from the spirit and scope of the invention.

What I claim is: 1. In adie casting machine, a frame vhaving a slideway, a die member secured to said frame, a carrier member slidably mounted in said slideway, a die member carried by said carrier member and vmovable therewith toward and away from said first-named die member, saidA second-named die member having a closed position cooperable-with said first-named die member, said carrier member having a tubular portion provided on one end thereof with cam means, a rotatable tubular member supported by said frame and having cam means on one end thereof, said cam means upon rotation of said tubular member in one direction cooperating with said first-named cam means for releasably locking said second-named die member in closed position, said rotatable member upon rotation in the.

opposite direction disengaging said first-named cam means and said second-named cam means lan`dittinginto said carrier member upon movement thereof' to move said second-named diemember to open position,- means to rotate said rotatable member, and means to move said carrier member. l f

2. In a die casting machine, a frame having a slideway, a die member secured to said frame, a carrier member slidably mounted in said slideway, a die member carried by said carrier memy ber and movable therewith toward and away from said first-named die member, said secondnamed die member having a closed position coperable with said first-named die member,l said carrier member having a tubular portion provided on one end thereof with cam means, a rotatable tubular member carried by said frame and having cam means on one end thereof, said second-named cam means upon rotation of said tubularl member in one direction cooperating with said first-named cam means for releasably locking me mend-named die membr in um position, said'rotatable member upon rotation in the opposite direction disengsinzv said first-` named cam'means'and said second-named cam means and ntting into said carrier member upon mo .ement thereof to movel said vsecond-named di member to open position, means to 'rotate walls, a carrier member slidably guided by said slideway, a die member carried by said carrier member and cooperable with said first-named die member, said second-named die member b'eing movable between open and closed positions with respect to lsaid first-named die member. a second carrier member slidably adjustable along said slideway, a rotatable member carried by and rotatable relative to said second-named carrier member, cam means carried by' said first-named carrier member, cam means carried by said rotatable member and cooperable with said rstnamed cam means upon rotation of said rotatable member in one direction to hold said second-named die member in closed position.

.4. Ina die casting machine, la. plurality of spaced parallel rails recessed to provide a slideway and having inwardly facing end abutment shoulders, opposite end walls abutting said shoulders, a die member secured to one ofsaid end walls, a vcarrier member slidably guided by said slideway, a die member carried by said carrier member and cooperable with said rst-named die member, .Said second-named die member being` movable between open and closed positions with respect to said rst-named die member, a second carrier member slidably adjustable along said slideway, a rotatable member carried by and ro- 5. In a machine of the character described. a frame including a plurality of spaced longitudia nally-extending rails positioned to provide a slideway and opposite end members 4mounted on said frame, a die member secured to one of said end members, a carrier member slidably guided by said slideway, a die member I carried by said carrierA member and cooperable with said firstnamed die member, a second carrier member slidably adjustable along said slideway, a rotatable member carried by said second-named carriermember, and means-on said first-named carrier rmember and on said second-named carrier member cooperable byl rotation of said rotatable mem-` ber to hold said movable die member in closed position with respect to said first-named die member.

6. In a machine .of the character described, a

frame including'means providing a slideway, a die member secured to said frame at one end of said slideway, a carrier member slidably guided by said slideway, a die member carried by said carrier member and cooperable with said firstnamed die member. a second carrier member slidably adjustable along said slideway, a rotatable member carried by said second-named carrier member. and means on said rst-named carrier member and on said second-named carrier member cooperable by rotation of said rotatable member to hold said movable die member in closed position with respect to said first-named die member.

'1. In a machine of the character described, a frame including means providing a slideway, a carrier member slidably guided by said slideway, a die member mounted on said frame, a. second tatable member carried by and rotatable relative to said second-named carrier member, and circumferentially spaced interrupted cam means on said second-named carrier member and on said-rotatable member cooperable and interengageable with one another on rotation o! said rotatable member to urge said die members together.