Claims
- 1. A method for manufacturing a die, which is configured of a polyhedron having multiple planes (11 through 16) of a similar shape and which can be opened into a continuous polygon area on a plane, each of the multiple planes having inclined boundary portions on one side (Rb1, Rb), the continuous polygon area being contiguous to one another through bridge portions (Br) connected between two adjacent ones of the multiple planes, the method comprising the steps of:preparing a mold (31, 32) having a first side and a second side opposite said first side, and a cavity therebetween in the form of said opened polyhedron and comprising inclined portions (34) which are formed on the one side and which correspond to the inclined boundary portions of the die, gate portions (35) connected to the inclined portions (34) on the one side, and raised portions (33) extended from an opposite side of the one side to define the bridge portions between the gate and the raised portions (35 and 33), the raised portions (33) forming linear grooves on the opposite side between the two adjacent ones of the multiple planes, said inclined boundary portions including a narrow inclined boundary portion (RB1) that is narrower in width than the remaining inclined boundary portions (Rb); and injecting a predetermined resin into said mold (31, 32) to obtain said die.
- 2. A method for manufacturing a die according to claim 1, wherein said predetermined resin is polypropylene.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2000-40936 |
Feb 2000 |
JP |
|
Parent Case Info
This is a divisional of application Ser. No. 09/785,325 filed Feb. 20, 2001; now U.S. Pat. No. 6,659,459 the disclosure of which is incorporated herein by reference.
US Referenced Citations (11)
Foreign Referenced Citations (7)
Number |
Date |
Country |
2061853 |
Sep 1990 |
CN |
2085676 |
Oct 1991 |
CN |
1093033 |
Oct 1994 |
CN |
8705084 |
Apr 1988 |
DE |
2202159 |
Sep 1988 |
GB |
7-112734 |
May 1995 |
JP |
8-143034 |
Jun 1996 |
JP |
Non-Patent Literature Citations (1)
Entry |
JP Comic Strip Publication, pp. 95 and 96—The structure of the dice is shown in the comic and is self-expalnatory. |