US1635370A - Apparatus and method of coating molds with carbon - Google Patents

Description

H. S. LEE

July 1927.

APPARATUS AND METHOD OF COATING MQLDS WITH CARBON Filed F sh. 16. 1925 2 Sheets-Sheet, 1

R m m m ATTORNEY.

1,6 July 12,1927. HSLEE 35 370 APPARATUS AND METHOD OF COATING MOLDS WI'I H CARBON Filed Feb. 16, 1925 2 Sheets-Sheet 2 Patented July 12, 1927.

UNITED STATES,

8. LEE, OF PLYMOUTH, MICHIGAN.

APPARATUS AND EETHOD OF COATING HOLDS WITH CARBON.

Application filed February matrix of the mold.

I The present method of coating molds with carbon is the passing of a'mold past a ball of incomplete combustion flame, the carbon bein 'de osited on the mold. This works fair y we ,but it is foundthat quite often.

the carbon is deposited unevenly and results in certain portions of the mold having a thicker coating of carbon than the remaining portion of the mold. This results in an uneven castiapg, as the thicker portions of carbon make pressions in the casting and quite often these difliculties necessitate the junking of the casting. -With my process the carbon is evenly distributed and there is nopossible chance of an uneven coatingof carbon being deposited. on the mold and thereby it reduces the number of castings which are wasted.

One of the objects of my improved method is the moving of a flame along the surface of the mold at a uniform rate of speed and -maintaining the flame at a constant distance from the surface of the matrix of the mold,

which is to be coated with the carbon.- Another object is the association of my method for permanent mold machines wherein a plurality .of molds are continually moving along a certain line. My method may be easily adapted to such a machine by moving the flame in conjunction with the -m0ving molds.

This method may be applied to various types of molding machines wherein the molds are moved or conveyed in a straight line or are located on a revolving table such as described in pending application 'erial N 0. 4,744.

, In the drawings:

Fig. 1 is a Iplan view of a portion of a permanent mo d machine, showing one form of mechanism for performing my method.

Fig. 2 is a section on the line 2-2 of Fig. 1, which shows one form of apparatus for passing the flame along the surface of V -the' matrix of the mold.

.F Fig. -3 is a section on the line 33 of arried on conveyer chains or bel s a are the supports 6. These supports carry the guide rods 0, which support t e mold carriers 16, 1-925. Serialdflo. 9,528.

d and e, the carrier (5 being held stationary near the extremity of the guide rods and the inner carrier e being slidably guided on the guide nods. These mold carriers each carry the mold halves f which are provided with a mold cavity or matrix g, thesurface of which it is desired to coat! with an even coating of carbon, which serves to insulate the mold from the molten metal and also serves as a parting material permitting the automatic discharge of the casting when the same hardens. The inner movable mold carrier 0 isprovided with the inwardly extending tongue 71., which carries the roller 71 on its inner end. This roller '5 is adapted to' be engaged in the cam groove 7' so that as the molds are moved longitudinally the roller rides in the'cam groove, thereby moving the mold carrier e to separate or close the molds.

Supported on the super-structure k,which is composed of any suitably designed steel framework, is a'triangular track m,which has one side 1:. inclined at an angle to the horizontal. Guided in these tracks is a flame apparatus 0, which is provided with the rollers 12 engaging in the tracks. This flameapparatus supports the horizontal gas pipe r, and the depending T-shaped gas distributing pipe, 8 provided with, the burner tips t, for proecting the flame laterally against the sur ace of the mold in a fanshaped flame. Carried by the gas pipe 7' is a depending trip arm u, which is engaged by the trip v carried on the movable supports 6. As the molds are moved along, the

trip '0 engages the arma and moves the flame carrying apparatus to the right, as viewed in Fig. 2, thereby causing the rollers p to ride up the inclined track 11., thereby raising the burner tips it into the dotted line position, as shown in Fig.2.

The upper end of the inclined track 11. is

closed by a trap door w, which allows the rollers to pass by. Now when the rollers reach t 's upper sition, carrying the flame carrier with it, t e arm a is raised and permits the trip u topass under, thereby -releasingthe arm and allowing the coil tension spring as, which is secured to a portion of the supperstructure and to the flame apparatus, to return the flame apparatus along the horizontal track y, thereby holding the flame or burner tip in its upper level until the same returns to approximately its original position over the following pair of molds, whereupon the same is, allowed to drop downthe vertical track 1 and to drop the flame in the following set of molds, whereupon the flame apparatus is again moved for repeating the operation for coatin the following set of molds.-

he burner tips are flattened out so as to provide a fan-shaped flame, which is di' rected against the matrix ofthe mold and coats a portion of the matrix with a coat of carbon. This flame is moved by the mechanism above described, and is raised slowly but at a uniform speed, thereby moving the flame along the surface of the matrix of the mold at a uniform and constant speed. This exposes. the surface of the matrix of the mold to a flame of equal intensity for a constant length of time, and as a result a uniform coatin of carbon is deposited thereon and avoids t e possibilty of some of the surface having a thicker coating of carbon than the remaining portion.

Obviously this fan-shaped flame could be varied within certain limits as a fan-shaped flame such as shown in this apparatus is 'more'particularly adapted for coating a mold provided with a circular form of matrix.

' for shooting Where flat surfaces are desired to becoated with carbon, several 'etscould be utilized a thin s eet of flame against the surface, the width of the flame depending upon the amount of surface to be coated. The essential feature is the moving of a sheet of flame .along the surface of the matrix of a mold-in a direction at right angles to the plane of the flame, thereby exposing all portions of the surface of the matrix to the flame for the'same length of time, and to expose all parts of the surface to a flame of equal intensity.

VVha t I claim is:

1. The method. of de of carbon overthe sur ositing an even coat ace of the matrix of a mold, which comprises the moving of a single incomplete combustion sheet flame aeeaeee having a greater relative width than depth at a uniform speed along the entire surface of the matrix of said mold in a direction which is at right angles to the plane of said sheet flame, and parallel to the sur face to be coated. I

2. The method of depositing an even coatof carbon over the surface .of the matrix of a mold, which comprises the moving at a constant speed by said mold of a single incomplete combustion relatively thin sheet flame having a uniform heat intensity along the entire surface of the matrix of said mold and moving in a direction which is at right angles to the plane of said sheet flame and parallel to the surface toibe coated.

3. In an apparatus for coating .molds with carbon, the combination of a burner provided with means for projecting a sheet.

flame, and means for 'moving'said burner "along {the surface; of said mold at right angles to the plane of the sheet,flame.

4. In an apparatus for coating molds with carbon, the combination of a burner pro vided with a burner tip having a-jet opening which is relatively long and narrow for the purpose of projecting a sheet flame, and means for moving said burner along the surface of said mold at right angles to the plane of the sheet flame.

5. In an apparatus for coating molds with carbon, the combination of a burner pro vided with means for projecting a" fan.- shaped sheet flame, said means located at a point substantially equi-distant from all points in the mold surface in the plane of the flame, and means for moving said burner parallel to the surface of the mold and at right angles to the plane of the fanshaped sheet flame.

In testimony whereof'I have aflix'ed my signature.

- HARRY s. LEE;

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