Wristwatch case and method of fixing pipe to wristwatch case

A wristwatch vase having a wristwatch case body provided with a through-hole and a pipe press-fitted in the through-hole which is obtainable by a process comprising:

• providing a wristwatch case body with a through-hole;
• press fitting a pipe exhibiting a through-hole/pipe press-fit overlap width of greater than 0 mm in the through-hole;
• and
• heating the wristwatch case after the press fitting, thereby joining and fixing the pipe to the wristwatch body so as to have no junction interface between the pipe and the wristwatch body,
• wherein the diameter of the through-hole and the outside diameter of the pipe each exhibit a roundness of 0.01 mm or less.

A wristwatch case having a wristwatch case body provided with a through-hole and a pipe press-fitted in the through-hole which is obtainable by a process comprising:

• providing a wristwatch case body with a through-hole;
• press fitting a pipe exhibiting a through-hole/pipe press-fit overlap width of greater than 0 mm in the through-hole;
• and
• heating the wristwatch case after the press fitting, thereby joining and fixing the pipe to the wristwatch body so as to have no junction interface between the pipe and the wristwatch body,
• wherein the through-hole on its internal surface has a surface roughness maximum (Rmax1) of 5 μm or less, and/or the pipe on its outside diameter portion has a surface roughness maximum (Rmax2) of 5 μm or less.

A wristwatch case having a wristwatch case body provided with a through-hole and a pipe press-fitted in the through-hole, which is obtainable by a process comprising:

• providing a wristwatch case body with a through-hole;
• press fitting a pipe which has it surface finished with a metallic coating and exhibits a through-hole/pipe press-fit overlap width of greater than 0 mm in the through-hole;
• and
• heating the wristwatch case after the press fitting in a vacuum or a reducing gas;
• thereby joining and fixing said pipe to the wristwatch body through a diffusion layer,
• wherein the diameter of the through-hole and the outside diameter of the pipe each exhibit a roundness of 0.01 mm or less.

A wristwatch case having a wristwatch case body provided with a through-hole and a pipe press-fitted in the through-hole, which is obtainable by a process comprising:

• providing a wristwatch case body with a through-hole;
• press fitting a pipe which has its surface finished with a metallic coating and exhibits a through-hole/pipe press-fit overlap width of greater than 0 mm, in the through-hole;
• and
• heating the wristwatch case after the press fitting in a vacuum or a reducing gas;
• thereby joining and fixing said pipe to the wristwatch body through a diffusion layer,
• wherein the through-hole on its internal surface has a surface roughness maximum (Rmax3) of 5 μm or less, and/or the pipe on its outside diameter portion has a surface roughness maximum (Rmax4) of 5 μm or less.

A wristwatch case having a wristwatch case body provided with a through-hole and a pipe press-fitted in the through-hole, which is obtainable by a process comprising:

• providing a wristwatch case body with a through-hole;
• press fitting a pipe which has its surface finished with a metallic coating and exhibits a through-hole/pipe press-fit overlap width of greater than 0 mm in the through-hole;
• and
• heating the wristwatch case after the press fitting in a vacuum or a reducing gas;
• thereby joining and fixing said pipe to the wristwatch body through a diffusion layer,
• wherein the diffusion layer comprises a layer formed by a solid phase diffusion from the metallic coating comprising at least two metals selected from among Ti, Fe, Cr, Ni, Cu, Al, Pt, Au, Pd and Ag.

A process of fixing a pipe to a wristwatch case body, comprising:

• providing a wristwatch case body with a through-hole;
• press fitting a pipe which has its surface finished with a metallic coating and exhibits a through-hole/pipe press-fit overlap width of greater than 0 mm in the through-hole;
• and
• heating the resultant wristwatch case after the press fitting in a vacuum or a reducing gas,
• thereby joining and fixing the said pipe to the wristwatch body through a diffusion layer,
• wherein the metallic coating comprises at least two metals selected from among Ti, Fe, Cr, Ni, Cu, Al, Pt, Au, Pd and Ag, and the diffusion layer comprises at least two metals selected from among Ti, Fe, Cr, Ni, Cu, Al, Pt, Au, Pd and Ag.