Metallic case for portable phone formed through press process and method of manufacturing the same

A method of manufacturing a metallic case for a portable phone through a press process, the method comprising:

• forming a workpiece by blanking one metallic plate;
• forming an edge wall as a punch presses and inserts the workpiece into a die, in a shape of a jointless rectangular frame having no defect including a wrinkle or a fracture;
• cutting and removing an extra portion (α) of the edge wall formed in the shape of the rectangular frame;
• and
• correcting a deformed portion by pushing and restriking the deformed portion to correctly form a shape or a dimension of a product formed in the thirdly cutting and removing of the extra portion (α) of the edge wall formed in the shape of the rectangular frame,
• wherein a folding surface is formed to be overlapped with the edge wall in the shape of the rectangular frame after the restriking is performed, while making close contact with an inner surface of the edge wall or being spaced apart from each other, such that an exposed outer surface of the edge wall has a curved surface or a chamfered surface inclined at a predetermined angle, and a step surface is easily formed at an upper end of the edge wall to mount a window glass.

A method of manufacturing a metallic case for a portable phone through a press process, the method comprising forming an edge wall to form inner spaces in both sides of an inner wall surface using one sheet of a metallic plate having malleability and toughness through the press process,

• wherein a first edge wall is formed to be erected by bending an edge of the inner wall surface,
• a second edge wall is formed to be bent downward from an upper end of the first edge wall,
• an overlap surface is formed to be overlapped with the first edge wall as the second edge wall extends downward of the inner wall surface, and
• a step surface is formed at the upper end of the first edge wall having the overlap surface to mount a window glass.

A method of manufacturing a metallic case for a portable phone through a press process, the method comprising:

• cutting a metallic plate in a predetermined size to form a workpiece such that the metallic case is manufactured;
• performing a primary drawing process to form a first edge wall at an outer portion of the workpiece while forming an inner space having a concave shape only at one surface of the workpiece;
• performing a secondary drawing process with respect to the workpiece subject to the primary drawing process to form the first edge wall at the outer portion of the workpiece while forming the inner space only at the one surface of the workpiece;
• cutting and removing an extra portion (α) of the workpiece except for a remaining portion for a second edge wall of the metallic case after performing the primary and secondary drawing processes;
• performing a preliminarily bending process with respect to the workpiece at a primary bending angle to form the second edge wall of the metallic case after removing the extra portion (α);
• and
• forming the second edge wall such that inner spaces are formed at both surfaces of the inner wall surface by erecting the second edge wall at a right angle in order to form the first and second edge walls at edges of the inner wall surface constituting the metallic case.

A metallic case for a portable phone which is formed through a press process, the metallic case comprising:

• a first inner space formed by a first edge wall formed upward from an edge of an inner wall surface by performing a drawing process with respect to one side of one metallic plate having a predetermined thickness;
• and
• a second inner space formed by a second edge wall formed by bending a flange, which is spread outward at a right angle from the first edge wall, downward from an upper end of the first edge wall,
• wherein a folding surface extending upward is formed to be overlapped with an inner portion of the second edge wall by bending a front end of the second edge wall, which extends downward, upward, such that an edge wall of a rectangular frame has a thickness thicker than a thickness of the inner wall surface, and
• step surfaces are formed to mount a window glass and a battery cover on and under the first and second edge walls having thicknesses thicker than the thickness of the inner wall surface to mount a window glass and a battery cover.

A method of manufacturing a metallic case for a portable phone through a press process, the method comprising:

• a first process of forming a first edge wall at an edge of an inner wall surface to form an inner space having a predetermined depth while forming a flange spread at a right angle by performing a drawing process with respect to one sheet of a metallic plate having a predetermined thickness;
• a second process of performing a restriking process to maintain a size of the inner space uniformly by the first edge wall;
• a third process of removing an extra portion (α) of the flange extending outward of the first edge wall through the restriking process;
• a fourth process of forming an overlap surface by bending a front end of the flange upward at a right angle after removing the extra portion (α) of the flange;
• a fifth process of bending the overlap surface, which is formed by bending the front end of the flange upward at a right angle, at an inclination angle of 45° to facilitate a hemming process;
• a sixth process of performing the hemming process to bring the overlap surface bent at 45° into close contact with a second edge wall;
• a seventh process of bending a part having the overlap surface, which is hemmed, at 45°;
• and
• an eighth process of performing a hemming process with respect to the part bent at 45°.