US1643780A - Air cooling of permanent molds - Google Patents

Description

p 927 H. s. LEE

AIR COOLING OF PERMANENT MOLDS 4 Shee ts-Sheet 1 Filed Aug. 24 1925 AIR COOLING OF PERMANENT MOLDS Filed Aug. 24 1925 4 Sheets-Sheet 2 I 1 4 ml[ 5 7 /g I, ZO I I 2? /J 2 /3 ,7 INVENTO A i/Fey 5 4/55 gww A TTORNE Y.

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p 927 H. 5. LEE

AIR COOLING OF PERMANENT MOLDS Filed Aug. 24, 1925 4 Sheets-Sheet 3v INVENTOR. IVA/ex) d in: K I

.4 TTORNEY.

Spt. 27,1927. H 5 LEE 1,643,780

AIR COOLING OF PERMANENT MOLDS Filed Auk. 24, 1925 4 Sheets-Sheet 4 m WWW JNVENTOI? 7449/PPY 0'- 1-155 i1 TTORNEY.

Patented Sept. 27, 1927. v I

UNITED STATES- PATENT OFFICE.

nanny s. LEE, or rmzmou'rn, MICHIGAN.

AIR COOLING OF PERMANENT MOLIDS.

Application filed August 24, 1925. Serial No. 51,973.

" This invention relates to permanent mold apparatus and methods of cooling the molds,

tained at a constant relatively high temperature so as to prevent the chilling of the casting. At the same time the mold must be prevented from getting too hot and the 2 object of-rny invention is to remove or carry away the heat from the mold at just the necessary rate to maintain this constant temperature.

A further object is an automatic control which regulates the rate at which the heat is withdrawn so as to maintain the mold at an even or constant temperature. I

The above and other ohiects which will hereinafter appear, are attained loy improve- 359 ments emhodying new and useful features as disclosed in this application. To enable others skilled in the art to fully comprehend the essential features of the improvements, drawings illustrating a preferred form have heen annexed as a part of this disclosure.

In the drawings:

l is a plan view of the preferred form or: apparatus showing a few molds assembled on the machine.

Fig. 2 is a section on the plane indicated by line 2-2 of Fig; 1.

3 is an outside front elevation. Pg. 4 is a plan sectional view taken on the line 4-4 or Fig. 2 and showing the outer air duct and related parts.

Fig. is an elevation of the hack of one of the mold sections.

S is an elevation of a modified form of the haclr of one of the mold sections with di li er nt shaped slots and fins.

The apparatus or machine illustrated has a stationary talole 1 and a rotating talole 11 mounted to rotate horizontally ahout a vertilt is important that the mold be main cal pivot. 2. Secured on the depressed outer rim 3 of the rotating table 1 are pairs of bearing blocks 4 which support guide rods 5 on which slide the inner mold section carriers 6. Bearing blocks 4 also serve to guide the sliding center rods 7 which reciprocate the inner mold section carriersin accordance with the action of rollers 8 engaging in the cam race 9 non-rotatably fixed beneath the stationary table 1*, and between guide blocks 10 secured to the table. Each permanent mold consists of sections 11, 12. Section 12 is fastened on outer mold section carrier 13 secured on the guide rod 5. The mold section 11 is fastened to inner mold section car- ;ier 6 which is mounted to slide on guide rods 5.

Beneath the paths of travel of the mold section carriers are arranged air ducts 14,

15. Duct 15 is circular to correspond with the travel of carrier 13, while duct 14 is parallel to the cam race 9 to correspond with the travel of carrier 6. Extending along the top of ducts 1,4, 15, are flapper valves 16 normally covering openings 17 in the ducts. Each flapper valve is pivoted at 18 and has a crank arm 19 which hy its weight normally tends to hold the valve closed.

Depending from the lower portion of each mold section is a housing 20 which isprovided with an extension 20 which is secured to the back of the mold and a casing 20 having a cam 21 is secured to the housing 7 20 which lifts the arms 19 to open the flapper valves 16 within the casing. The hack of each mold section has slots 23 to provide passages forair between cooling fins Q2. The extension or back plate 26 does not cover the entire back of the mold ,lout stops short of the top so as to provide an air inlet opening 24 through which the air is admitted into the passages 23 between the cooling fins 22.

Each moldis opened and closed at the appointed time by the table rotating and the roller traveling in the cam race. Each casing 20 depending from its corresponding housing 20 freely passes along one of the ducts and opens valves 16 located within the casing. As each duct is connected with a source of suction, air is sucked through the inlet' opening 24 into the passages between the cooling fins 22 for facilitating the distill film

.sipation of heat, the air passing down through openings 17 to be carried ofi through the face of the mold, say for example, the

back of the mold has a temperature of approximately 700" when the face of the mold has a temperature of 900. As more of the coolair is caused to travel down the passageway 23 between the fins on the back of the mold, more heat will be withdrawn from the mold. Secured in one of these passageways 23 on the back of the mold, is a thermal element 30 which is preferably held by suitable guides 31 for the major portion of its length. This thermal element may be of any suitable construction and is preferably formed of two pieces of strip metal, one of which has a greater co-efficient of expanse than the other.

In Fig. 3 I show the two positionsof this thermal element and designate the same as A and B. When the temperature reaches the maximum, the thermal element is in the position designated as B and in the position A at the minimum position. Pivoted as at 32 is a valve33. Fig. 2 shows this valve as closed. To the end of the thermal element is secured a link 34. The other end of said link is secured to a bell crank 35 pivoted at 36. A link 37 connects the other end of the bell crank with the flap valve 33. As the temperature on the back of the mold raises, the thermal element will move from position A towards'position B, thereby opening the valve 33 through the link and crank connection above described. .The opening of the valve 33 permits additional air to be drawn through the passageway 33 in the back of the mold and consequently removes heat from the mold at a greater rate of speed, thereby lovgeiring the temperature at the back of the mo I This automatic thermal control obviously can be nicely timed and regulated to main-' tain the back of the mold at a constant temperature. Of course there might be slight. main:

fluctuations, but the temperature is tained relatively constant.

What I claim is:

1. In a permanent mold apparatus, in combination, a" mold having cooling fins, and an adjacent duct for fluid to cause the fluid to flow against the fins. 1

2. In a permanent v mold apparatus, in combination, a mold mountedto travel in a path, and a duct for fluid extending along combination, movable molds, an

neaaveo the path of travel of the mold and constructed to cause fluid to flow against the mold during travel of the same.

3. In a permanent mold apparatus, in combination, a mold mounted to travel in a path, a duct for fluid extending along the path of travel of the mold and provided with a plurality of valves extending along the duct, and means adapted to open each valve while the mold is adjacent the valve.

d. In a permanent mold apparatus, in combination, a mold mounted to travel in a path, a duct for fluid extending along the path of travel of the mold and provided with a plurality of valves extending along the duct, and means traveling with the mold to open each valve while the mold is adja cent the valve.

5. lln a permanent mold apparatus, in combination, a mold mounted to travel in a path, a duct for fluid extending along the path of travel of the mold, a plurality of valves mounted along the face of the duct which is nearest the path of'travel of the mold, and means traveling with the mold to open each valve while the mold is adjacent the valve.

6. In a permanent mold apparatus, in combination, a mold mounted to travel in a path, a duct for air or the like extending along. the path of travel of the mold, a pluwith the mold to open each valve while the mold is adjacent the valve.

7. In a permanent mold apparatus, in combination, a two section mold whose seotions are mounted to travel together, cam

means adapted to cause one of said mold sections to be reciprocated relatively to the other mold'section during the travel of the sections, and a duct for fluid extending along the path of travel of each mold section and constructed to cause fluid to flow-against the mold sections during the travel of the same. 8. In a permanent mold apparatus, in combination, a two section mold whose sections are mounted to rotate together, cam means adapted to cause oneof said mold sections to be reciprocated relatively to the other mold section during the rotation of the sections, and a duct for fluid extending along the path of travel of each mold section and constructed'to cause fluid to flow against the mold sections during the travel of the same. I a

9. In a permanent mold apparatus, in

means actuated by the movement of the molds ,for

causinp: fluid to flow against the molds.

ling permanent molds which comprises intermittently introducing metal into themolds and maintaining the wallsof the mold relaunease tively cold by introducing a 000E111? fluid against an external part of the mold While the mold is travelling.

11. In a molding apparatus, a mold; a support therefor, means for moving the mold in a cyclic path to receive molten metal and form the same, and means for causing fluid to flow against the mold throughout its entire cyclic path. I

12. In a molding apparatus, a mold, a support therefor, means for moving the mold in a cyclic path to receive molten metal and form the same, a duct for a cooling fluid,

and means for causing the cooling fluid to flow against the mold While the mold is mom ing in its path.

13. The method of casting metal in travelling permanent molds which comprises intermittently introducing metal into the molds and maintaining the molds relatively cold by introducing a cooling fluid against the molds While the said molds are travelling.

In testimony whereof l have axed my signature.

RY S. LEE.

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