US1938707A

US1938707A - Process or method of casting

Info

Publication number: US1938707A
Application number: US471325A
Authority: US
Inventors: Ira C W Mann
Original assignee: Reo Motor Car Co
Current assignee: Reo Motor Car Co
Priority date: 1930-07-28
Filing date: 1930-07-28
Publication date: 1933-12-12
Anticipated expiration: 1950-12-12

Description

Dec., 12, 1933. L Q w, MANN 1,938,707

PROCESS OR METHOD OF CASTING Filed July 28, 1930 IIIII l To? 27@ Mani/a y ATTO R N EY Patented Dec. 12, 1933 UNITED STATES PATENT OFFICE Motor Cat Company, poration of Michigan Lansing, Mich.. a col'- Applcation July 28, 1930. Serial No. 471,325

1 Claim.

This invention relates to a cast metal plate having a pin of different material cast thereinand to the process or method of casting the same. l

The invention relates particularly to a cast iron punch plate having a steel pilot pin cast therein and to the method of making the same.

Heretofore it has been the custom to employ in connection with punch presses and the like, a

1 punch plate formed of cast iron or the like having formed thereon an integral cast projection or pin by means of which the plate is secured to the press. It has been found in practice, however, that cast iron pins or projections cast with the plate when the same ismade are apt to fracture and frequently do at the juncture of the pin with the plate.

It is therefore one of the important objects of my invention to provide a punch plate having zo a steel pin secured thereto when the plate is cast, it being found that in structures of this kind all liability of fracture at the juncture of the plate and pin is eliminated.

The several objects and advantages of my invention together with the manner in which my improved method or process is practiced will be made more apparent as this description proceeds, especially when considered in connection with the accompanying drawing, wherein Figure 1 is a perspective view of a punch plate constructed in accordance with my invention and in accordance with my process;

Figure 2 is a vertical sectional view through a mold by means of which the plate is cast, and

g5 Figure 3 is a top plan view of the core of the mold.

As seen from Figure 1, the punch plate 10 is cast with a pilot or pin 11, formed preferably of steel and united with the plate 10 when the latter o is cast.

By reference to Figures 2 and 3the manner in which the punch plate 10 is cast will be made more apparent. In this iigure it will be noted that the mold consists of a drag section 12 and I5 a cope section 13. The drag section of the mold is provided with the punch plate pattern recess or cavity 14. The drag section of the mold is preferably rammed full of sand with the bottom side up, the sand being rammed around the 0 punch plate pattern (not shown) which would then be in the bottom thereof. The drag section of the mold is then turned over placing the pattern on top.

The reference character 15 indicates the core 5 of the mold which as shown in Figure 3, is formed of two sections 15'. The two halves of the core are recessed to accommodate the end of the pilot or pin 16 and after being placed together these two core halves are cemented together to thus hold the pilot or pin in place.` The core is proso vided with a plurality of vertically extending apertures 17 arranged circumferentially around the pilot 16.

The core together with the pilot 16, is placed in the cope section of the mold and for locating the pilot with respect to the mold cavity during the time that sand is rammed into the cope section of the mold, the punch plate pattern which is still in the drag section of the mold is provided with an aperture 18, see the dotted line illustration of a portion of the punch plate pattern shown in Figure 2.

Therefore with the core in position and with the pilot 16 extending down into the aperture 18, sand is rammed around the core rmly to hold the core in the position shown. At the same time a riser (not shown) is inserted in the upper ask to provide the riser opening 19.

After the cope section has been rammed full of sand it is removed on the parting line, the pattern is taken out together with the member which formed the riser opening and an outlet is made communicating with the riser opening. Thereafter the cope section is again placed on the drag section of the mold whereupon the pilot or pin 16 will project down into the pattern recess or cavity 14. Thereafter a runner box 20 is placed on top of the cope section of the mold in position to surround the core 15. Also an over-flow basin 2l is placed at the side of the mold adjacent the riser and the molding apparatus is ready for the-.pouring of the molten metal. A

At this point it might be noted that the pilot or pin 16 is preferably made of cold-rolled steel and copper plated. In the flrst place, this prevents rusting of the pilot and the copper serves as a flux to insure an adequate union between the pilot and the cast iron of which the punch plate is formed.

The metal is then poured into the runner box in suiiicient quantities and fast enough to keep the runner box substantially completely full, thus creating a static head or pressure which acts to force the molten metal down through the circumferentially arranged apertures 17 and into 105 the mold cavity 14. After the mold cavity 14 is full, the metal overows through the riser and flows into the over-now basin 21.

In practice it has been found eicient to pour into the mold a surplus of metal substantially 110 equal to the amount required to illl the pattern recess or cavity 14. This surplus of hot molten metal which ows through the apertures 17 and into the pattern recess heats the pilot or pin 16 substantially to a melting point which causes the pilot and the plate to unite. By reason of the fact that the pilot becomes thoroughly heated throughout its length, it does not cool quicker than or prior to the plate'lO so that there is no difference in the coefficient of expansion or contraction which would permit the pilot 16 to become loose with respect to the plate. Moreover, it is desirable, although not essential, that the end of the pilot 16 be provided with a circumferential groove or reduced portion 16' into which the molten metal will flow to provide a more adequate union between the parts. In practice it also has been found that by maintaining the pin heated throughout its length it will not chill and harden the cast iron and prevent machini118.

When the cast article has become suiiiciently chilled to be removed from the mold, the core 15 is obviously removed from the pilot 16.

Various modicatons of the specic method herein described may suggest themselves to those skilled in this art and to this end reservation is made to make such changes as may come Within the purview of the accompanying claim.

What I claim as my invention is:

Those steps in the method of integrating a steel pilot with a cast iron punch plate which consist in forming a cavity in a lower mold part, said cavity being of the size and shape of the punch desired, mounting a pilot in a core member with the end of the pilot projecting from the core member, mounting said core member in a second mold part, assembling said second mold part with the first mentioned mold part with the projecting end of the pilot disposed in the cavity in the rst mentioned mold part, forming passages in the core member circumferentially of the pilot, and pouring molten casting metal into said cavity by way of said passages.

IRA C. W. MANN.