US2816650A - Device for trimming the back edge and side face of cast slugs in a matrix-composing and line casting machine - Google Patents

Description

Dec. 17, 1957 K. DEBUS ETAL 2,816,650

DEVICE FOR TRIMMING THE BACK EDGE AND SIDE FACE OF CAST SLUGS IN A MATRIX-COMPOSING AND LINE CASTING MACHINE' Filed Feb. 9, 1954 ite @tates Patent DEVICE FOR TRllVIMING THE BACK EDGE AND SIDE FACE OF CAST SLUGS IN A MATRlX-COM- POSING AND LINE CASTING MACHINE Karl Debus, Bad Homburg, and Rudolf Hiirter, Frankfurt am Main, Germany Application February 9, 1954, Serial No. 409,137

Claims priority, application Germany February 9, 1953 3 Claims. (Cl. 199-59) This invention relates to a method of and device for trimming the back edge and side face of cast slugs in a matrix-composing and line casting machine.

Known methods and devices, particularly back knives and knife blocks, for trimming the back edge and side face of cast slugs in a line composing and casting machine, are inadequate; when they are used, deviations of a few hundredths of a millimeter from the required size are often unavoidable. This in turn involves a great deal of make-ready on the forms. The inaccuracy of cast slugs is partly by the fact that a cast slug, inserted in a mould without being securely held, is conveyed past a stationary back knife. The resulting slug dimensions vary according to the state of the knife-edge; too sharp a knife draws the slug, too blunt a knife repels it. The same applies to the side knives, the precise cutting angle of which is also very important any in accuracy in one slug in this case becomes multiplied in a group of slugs.

it has been proposed that inaccuracies in slugs may be removed by casting them a few millimeters too high and milling off the back edge to the precise slug height, preferably by means of a planer-type milling machine. However, this method requires a separate operation and special machining devices.

It has now been found that it is possible according to the present invention to finish a slug extremely accurately in a more simple manner, while still in a matrix-composing and line casting machine, and to keep the dimensional variations in the height of the slug below 0.01 mm. Adjustment of the necessary accuracy in the dimensions takes place independently of the mould of the machine.

In order to give it a precise height, a cast slug, the back edge of which may conveniently have been already deburred by means of the usual back knife, is machined on its back edge between being ejected from the mould and being placed on the galley of the machine.

Since one side face of the slug can be milled simultaneously with the back edge of the slug, and hence finely machined, a knife block is unnecessary.

The slug coming from the mould is preferably pushed on to a carriage against stops which locate the slug. Carriage and slug are then conveyed past a milling cutter or the like, which machines the back edge of the slug accurately. Micrometer devices are useful for accurate setting of the milling cutter.

It is advisable to sub-divide the stops into individual lamellae which can be secured in position and, in case the type edge of the slug has blind portions as well as a type profile, to arrange for the corresponding lamellae to be pressed back by the type profiles, while the remaining lamellae either rest against the blind portions of the type edge already or are brought into contact with these portions by means of special members. The lamellae may then be secured or locked and thus form a stop for all portions of the type edge of the slug.

Such a reciprocally profiled stop also has the advantage that slugs which are only partially covered with type do not tilt when they rest against the stop and do not become inclined at an angle on the carriage. In the first instance the slug is only approximately accurate and should not be pressed against the type face of the slug alone as this would deform the type. Thus the slug itself forms the profile of the stop which thus rests against the whole of the slug.

In practice it is advisable to proceed in such a manner that the ejector blades or fingers of the ejector device of the machine force the cast slug out of the mould until the type edge rests gently against the lamellae, possibly with the type-face portions pressing back the lamellae lying opposite them. The lamellae would 10- cate a blind slug accurately in their normal or initial position.

The lamellae may then be secured, for example by means of a locking plate, and the ejector blades retracted. The slug may then be gently pressed against the fixed lamellae by means of a resilient member and clamped against a fixed lower stop bar at one end of the slug from the other end of the slug.

Carriage, slug and stop are then set in motion and travel along a milling cutter, the back edge being milled. At the same time one side face of the slug can be finely machined, for example milled, as a result of which an accurate thickness of the slug is ensured. For this purpose the thickness milling cutter is made adjustable according to the various thicknesses, for example from 4 to 42 point thick.

The small burrs at the head of the slug on the opposite side face are preferably removed in the same operation by means of a stationary knife, for example, a type of scraper blade.

By withdrawing the stop, the slug may be released and can slide in known manner on to the galley.

An embodiment of a device for carrying out the method of the invention is hereinafter described, by way of example, with reference to the accompanying drawings, in which:

Figure 1 is a view of one side face of a slug pressed against stop lamellae by the ejector blades of a matrixcomposing and line casting machine,

Figure 2 is a side view of the carriage of the machine with a clamped slug being machined both by a back edge milling cutter and by a side face milling cutter, and

Figure 3 is a section along the line 11-11 in Figure 2.

A slug 6, pressed against stop lamellae 3, 4, 5 by the ejector blades 2 of an ejector device of the machine, which is not illustrated, is supported by a carriage 1. The slug 6 rests with its end 7 against a stop bar 8 and is urged against this stop by means of a force indicated by the arrow 9. The bar 8 is thinner than the thinnest slug, i. e. about 1.5 mm. The groups of lamellae 3 and 5 rest against the fixed angle-bar l0 and are pressed against the bar it) by type-carrying portions 11 and 12 of the slug, while the blind portions 13, 14 of the slug rest against the groups of larnellae 4, but do not press these against the bar 10.

The carriage l is guided by means of a dovetail 15, and holds the lamellae which are made angular. The arms of the angular lamellae which are not cooperating with the slug are pointed as at 16. The lamellae 3, 4, 5 which are subject to a slight spring pressure towards the right as shown in Figure 2, are pushed by the slug, according to the profile thereof, and are subsequently fixed in the left-hand or right-hand end position by a pointed locking plate 17, according to their position. A channel 18 in the carriage serves to guide a blade 19 on its rail 20. Coolant flows through a passage 21.

The side face 22 of the slug 6 is finely machined by a side-milling cutter 23, and the back edge 24 of the slug by a back-milling cutter 26 mounted on a common spindle 25. The milling cutters may run, for example, at 6000 R. P. M.

We claim:

1. A device for producing an exact required height of a cast slug in a matrix-composing and line casting machine having a mould, comprising a carriage for said slug, stop lamellae to locate said slug ejected from said mould, a locking plate for said lamellae and precision cutting tools mounted in said machine independently of said mould, said lamellae being individually securable by said locking plate in positions that they may take up depending on the profile of the type edge of said slug to form a complete stop along the whole type edge of said slug and said cutting tools being precisely adjustable for micro finishing the back edge and a side face of said slug.

2. A device for producing an exact required height of a cast slug in a matrix-composing and line casting machine having a mould, comprising a carriage for said slug, stop lamellae to locate said slug ejected from said mould, a locking plate for said lamellae, a driving shaft mounted in said machine independently of said mould and a back-milling cutter and a side-milling cutter mounted on said shaft, said lamellae being individually sccurable by said locking plate in positions that they may take up depending on the profile of the type edge of said slug to form a complete stop along the whole type edge of said slug and said cutters being precisely adjustable for micro-finishing the back edge and a side face of said slug.

3. A device for producing an exact required height of a cast slug in a matrix-composing and line casting machine having a mould comprising a carriage for said slug, stop lamellae to locate said slug ejected from said mould, a locking plate for said lamellae, a driving shaft mounted in said machine independently of said mould, a back-milling cutter and a side-milling cutter mounted on said shaft, said lamellae being individually sccurable by said locking plate in positions that they may take up depending on the profile of the type-edge of said slug to form a complete stop along the Whole type edge of said slug and said cutters being precisely adjustable for micro-finishing the back edge and side face of said slug, and a fixed scraper blade held against that side face of said slug opposite to said face which has been machined by said side-milling cutters to remove burrs therefrom.

References Cited in the file of this patent UNITED STATES PATENTS 1,083,195 Lucke DAiX Dec. 30, 1913 2,011,212 Curle Aug. 13, 1935 2,056,566 Curie et al. Oct. 6, 1936 2,202,942 Beiber June 4, 1940 FOREIGN PATENTS 530,214 Great Britain -2 Dec. 6, 1940 OTHER REFERENCES Kents Handbook (Kent) (11th ed.), published by Wiley & Sons (New York), 1938 (pages 21-33 thru 2l-46).

Images