Method of manufacturing enhanced teeth of dipper bucket of shovel
A process of manufacturing a tooth of a dipper bucket of a shovel is disclosed. The tooth has a larger joining portion coupled to the dipper bucket and a sharp portion. The process comprises cooling the molded tooth in a furnace at about 920° C., suddenly cooling the tooth in a fluid contained in the furnace, heating the tooth at about 460° C., slowly cooling the tooth in the air, supporting the tooth in the furnace with the joining portion immersed in the fluid and the sharp portion exposed in the air, and producing the finished tooth. The teeth are less brittle and more ductile while having a sufficient hardness. The teeth can dig further into earth for increasing load of the dipper bucket per shovel.
1. Field of the Invention
The present invention relates to the manufacturing of dipper bucket of shovel and more particularly to a method of manufacturing teeth of a dipper bucket of shovel with improved characteristics such as strengthened structure and improved ductility.
2. Description of Related Art
A conventional dipper bucket 1 of shovel is shown in
Another conventional dipper bucket 1 of shovel is shown in
It is an object of the present invention to provide a process of manufacturing a tooth of a dipper bucket of a shovel, the tooth having a larger joining portion coupled to the dipper bucket and a sharp portion, the process comprising cooling the molded tooth in a furnace at about 920° C., suddenly cooling the tooth in a fluid contained in the furnace, heating the tooth at about 460° C., slowly cooling the tooth in the air, supporting the tooth in the furnace with the joining portion immersed in the fluid and the sharp portion exposed in the air, and producing the finished tooth. The present invention has the advantages that the teeth are less brittle and more ductile while having a sufficient hardness, the teeth can dig further into earth for increasing load of the dipper bucket per shovel, and the teeth are durable.
The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Referring to
Referring to
Note that heating elements of the furnace 30 are provided in the bottom thereof. Hence, temperatures in different portions of the furnace 30 may be different. As shown in
The joining portion 11 has a strengthened structure and improved ductility. Hence, it is possible of increasing length of the integral sharp portion 12 without worrying about breakage thereof while inserting into earth in operation. As a result, a load of the dipper bucket 2 per shovel is increased (see
Referring to
While the invention herein disclosed has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention set forth in the claims.
Claims
1. A process of manufacturing a tooth of a dipper bucket of a shovel, the tooth having a larger joining portion coupled to the dipper bucket and a sharp portion, the process comprising the steps of:
- (a) cooling the molded tooth in a furnace at a first temperature;
- (b) suddenly cooling the tooth in a fluid contained in the furnace;
- (c) heating the tooth at a second temperature;
- (d) slowly cooling the tooth in the air;
- (e) supporting the tooth in the furnace with the joining portion immersed in the fluid and the sharp portion exposed in the air; and
- (f) producing the finished tooth.
2. The process of claim 1, wherein the furnace is an electric furnace.
3. The process of claim 1, wherein the first temperature is about 920° C.
4. The process of claim 1, wherein the fluid is oily.
5. The process of claim 1, wherein the second temperature is about 460° C.
6. The process of claim 1, wherein the fluid at a bottom of the furnace has a temperature about 560° C. and the fluid at its surface has a temperature about 460° C.
7. The process of claim 1, wherein the joining portion has a hardness number from about 35 to about 46 as expressed in HRC and the sharp portion has a hardness number from about 46 to about 48 as expressed in HRC.
Type: Application
Filed: Jul 7, 2003
Publication Date: Sep 29, 2005
Inventor: Jung-Ching Ko (Taichung City)
Application Number: 10/613,083