US3916976A

US3916976A - Process for producing foundry sand molds

Info

Publication number: US3916976A
Application number: US430473A
Authority: US
Inventors: Leon F Miller; Henry J Herbruggen; Robert G Shields
Original assignee: Sherwin Williams Co
Current assignee: Sherwin Williams Co
Priority date: 1971-04-05
Filing date: 1974-01-03
Publication date: 1975-11-04
Anticipated expiration: 1992-11-04

Abstract

A foundry molding machine utilizing a match-plate and two sets of rubber lined cope and drag slip flasks with two stations; one station assembling one set of flasks with the match-plate therebetween and then rolling over the flask-match-plate assembly to fill the drag with sand while supporting the assembly on the cope and jolting and applying a low pressure preliminary squeeze to the sand within the drag, rolling the assembly back to fill the cope and then supporting the assembly on the sand within the drag for the application of jolt and high pressure squeeze to the sand in both the cope and drag, separating the assembly and indexing the cope and drag vertically separated to a second station while simultaneously indexing the second set of flasks to the first station, holding the sand rammed flasks vertically separated in the other station to permit coring and closing the flasks and stripping the sand cakes thus assembled therefrom to be placed on a bottom board while the second set of flasks are being filled and rammed at the first station; the indexing and roll-over of such flasks being obtained each by a piston-cylinder assembly having controlled stroke deceleration on extension thereof.

Description

' United States Patent [191 Miller et al.

[ PROCESS FOR PRODUCING FOUNDRY SAND MOLDS [75] Inventors: Leon F. Miller, Rocky River; Henry J. Herbruggen, Westlake; Robert G. Shields, Chagrin Falls, all of Ohio Related US. Application Data [62] Division of Ser. No. 131,528, April 5, 1971, Pat. No. 3,815,662, which is a division of Ser. No. 672,063, Oct. 2, 1967, Pat. N0. 3,589,432. I

[52] US. Cl. 164/37 [51] Int. Cl. B22C 15/30 [58] Field of Search 164/27, 29, 37, 38, 39,

[56] References Cited UNITED STATES PATENTS 1,561,500 11/1925 Wood 164/29 2,013,278 9/1935 Luton 164/37 X 3,506,058 4/1970 Hunter 164/37 Primary Examiner-Francis S. Husar Assistant Examiner John E. Roethel Attorney, Agent, or FirmDonnelly, Maky, Renner &

Otto TE F Nov. 4, 1975 ABSTRACT A foundry molding machine utilizing a match-plate and two sets of rubber lined cope and drag slip flasks with two stations; one station assembling one set of flasks with the match-plate therebetween and then rolling over the flask-match-plate assembly to fill the drag with sand while supporting the assembly on the cope and jolting and applying a low pressure preliminary squeeze to the sand within the drag, rolling the assembly back to fill the cope and then supporting the assembly on the sand within the drag for the application of jolt and high pressure squeeze to the sand in both the cope and drag, separating the assembly and indexing the cope and drag vertically separated to a second station while simultaneously indexing the second set of flasks to the first station, holding the sand rammed flasks vertically separated in the other station to permit coring and closing the flasks and stripping the sand cakes thus assembled therefrom to be placed on a bottom board while the second set of flasks are being filled and rammed at the first station; the indexing and roll-over of such flasks being obtained each by a piston-cylinder assembly having controlled stroke deceleration on extension thereof.

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Claims

1. A process for producing foundry sand molds comprising the steps of assembling cope and drag flasks with a pattern therebetween, placing the drag flask up and filling it with sand, preliminarily squeezing the sand therein, then turning the assembly over and filling the cope flask with sand, squeezing such sand in both the cope and drag flasks, vertically separating the cope and drag flasks, and then laterally indexing such flasks vertically separated for coring and closing.

2. A process as set forth in claim 1 including the step of jolting the cope and drag flasks to facilitate the ramming of sand therein.

3. A process as set forth in claim 1 including the step of supporting peripherally the cope flask as the drag flask is filled, and supporting the preliminarily squeezed sand cake within the drag flask as the cope flask is filled.

4. A process as set forth in claim 1 wherein the assembly is turned over by the retraction and extension of a piston-cylinder assembly having controlled deceleration on extension.

5. A process for producing completed foundry sand molds comprising the steps of ramming cope and drag flasks with a pattern therebetween at one station, vertically separating such flasks to draw the pattern therefrom, indexing such vertically separated flasks to a second station, holding such flasks vertically separated at such second station to permit coring, and then closing such flasks and stripping the sand molds therefrom.

6. A process as set forth in claim 5 including two sets of cope and drag flasks, and indexing such sets alternately to and from the two stations.

7. A process as set forth in claim 5 including the step of indexing empty flasks into such one station as the sand rammed flasks are indexed from such one station.

8. A process as set forth in claim 5 including the steps of placing the drag flask up and filling it with sand at such one station, preliminarily squeezing the sand therein and then turning the assembly over and filling the cope-flask with sand and then finally squeezing such sand in both the cope and drag flasks.

9. A process as set forth in claim 5 wherein the ramming of the cope and drag flasks is accomplished by both high pressure squeeze and jolt.

10. A process as set forth in claim 5 including the step of placing a bottom board under the sand molds at the second station.

11. A process as set forth in claim 5 wherein the closing of such flasks and the stripping of the sand molds therefrom is accomplished at such second station.