Patent ID: 7713050
Filing Date: 2010-05-11
Classification: B23P,B28B,B29C,B29L,Y10T

Abstract:
1. A die for forming a honeycomb structure comprising: a die base having a first plate-like member provided with back holes to introduce a forming material and a second plate-like member provided with slits to form the forming material into a lattice-like shape, the first plate-like member being provided with groove portions having shapes corresponding to the slits on the side of a bonding surface between the first plate-like member and the second plate-like member, the groove portions each having a depth y (mm) which satisfies the following equation (1) in which t1 is a thickness (mm) obtained by subtracting the depth (mm) of the groove portions from a thickness (mm) of the first plate-like member, E1 is an apparent volume elasticity (GPa) of the first plate-like member at 25° C. in consideration of a state in which the back holes are formed, t2 is a thickness (mm) of the second plate-like member, E2 is a volume elasticity (GPa) of the second plate-like member at 25° C., and a is a coefficient calculated using the formula: where k is a numerical value indicating bonding strength, α1 and α2 are the thermal expansion coefficients (1/° C.) of the first plate-like member and the second plate-like member, respectively, ΔT is a temperature difference between a bonding temperature (° C.) in a case where the first plate-like member is bonded to the second plate-like member and ordinary temperature (° C.), and M and L are a width (mm) and a pitch (mm) of the groove portions respectively.