RING GEAR AND MANUFACTURING METHOD FOR SUCH A RING GEAR
First Claim
1. A method of manufacturing a forged article including a surface, the method comprising:
- defining a negative tooling pattern based on the surface;
providing a tooling set having a bottom die, a top die and an anvil, the bottom die being formed with an upper die surface that conforms to the negative tooling pattern, the anvil extending through the bottom die and defining an axis, the bottom die and the top die cooperating to define a die cavity;
preheating an annular blank formed of ferrous material to forging temperature selected Tw release to the melting temperature Tm of the material so that the homologous absolute temperature ratioTw/Tm is between 0.62 and 0.80;
placing an annular blank on an anvil and into the die cavity between a top die and the bottom die; and
pressing the blank between the top and bottom dies in a pressing direction that is generally parallel to the axis to form the forged article in single stroke.
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Abstract
A method of manufacturing a forged article (10) including a surface (18). The method includes defining a negative tooling pattern (52) based on the surface and providing a tooling set (28) having an anvil (30) and top (36) and bottom die (34). An upper surface (40) of the bottom die conforms to the negative tooling pattern. When the tooling is assembled the anvil extends through the bottom die and defines an axis. Additionally, the bottom and top dies cooperate to define a die cavity (76). A hollow blank (38) is preheated and placed on an anvil and into the die. In a single stroke, the hollow blank is pressed between the top and bottom dies in a pressing direction that is parallel to the axis. The preheating temperature Tw is a function of the homologous temperature ratio Tw/Tm is between 0.62 and 0.80, where Tm is the absolute melting temperature of the alloy.
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Citations
20 Claims
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1. A method of manufacturing a forged article including a surface, the method comprising:
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defining a negative tooling pattern based on the surface; providing a tooling set having a bottom die, a top die and an anvil, the bottom die being formed with an upper die surface that conforms to the negative tooling pattern, the anvil extending through the bottom die and defining an axis, the bottom die and the top die cooperating to define a die cavity; preheating an annular blank formed of ferrous material to forging temperature selected Tw release to the melting temperature Tm of the material so that the homologous absolute temperature ratioTw/Tm is between 0.62 and 0.80; placing an annular blank on an anvil and into the die cavity between a top die and the bottom die; and pressing the blank between the top and bottom dies in a pressing direction that is generally parallel to the axis to form the forged article in single stroke. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of manufacturing a ring gear including a surface having teeth, the method comprising:
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defining a negative tooling pattern based on the surface; providing a tooling set having a bottom die, a top die and an anvil, the bottom die being formed with an upper die surface that conforms to the negative tooling pattern, the anvil extending through the bottom die and defining an axis, the bottom die and the top die cooperating to define a die cavity; preheating an annular blank formed of ferrous material to forging temperature selected Tw release to the melting temperature Tm of the material so that the homologous absolute temperature ratioTw/Tm is between 0.62 and 0.80; placing an annular blank on an anvil and into the die cavity between a top die and the bottom die; and pressing the blank. between the top and bottom dies in a pressing direction that is generally parallel to the axis to form the ring gear. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification