Ceramic Body and Steel Post Locating Pin Assembly
A composite locating pin adapted for interconnection with a welding apparatus, securing a plurality of workpieces in a fixed relative condition, and resisting slag adhesion, deformation and pin failure, during a welding cycle, includes, in a preferred embodiment, a removable pin body formed of a technical ceramic, a pin post formed of a steel alloy, and an adhesive layer intermediate the body and post, wherein the body and post are cooperatively configured so as to be removably yet securely interfitted in an assembled condition, and the layer is configured so as to further secure the pin in the assembled condition.
1 . A composite locating pin adapted for use with a welding apparatus and for locating and securing a plurality of workpieces in a fixed relative condition during a welding cycle, wherein slag is generated, said pin comprising:
a pin body formed of a first material generally resistant to deformation and adhesion to the slag, wherein said first material is electrically and thermally insulative; and
a post formed of a second material having lateral bending, tensile and shearing strengths greater than the first material, and configured to be securely interconnected with the apparatus,
said body and post being mated pairs, and cooperatively configured so as to be securely interfitted in an assembled condition.
2 . The pin as claimed in claim 1 , further comprising:
a locking mechanism configured to hold the pin and post in the assembled condition.
3 . The pin as claimed in claim 2 , wherein the mechanism includes loctite.
4 . The pin as claimed in claim 2 , wherein said body defines a longitudinal cavity, the post presents an elongated member, and said cavity and member are cooperatively configured so that at least a portion of the member is receivable within the cavity.
5 . The pin as claimed in claim 4 , wherein the body presents a longitudinal body length, and the member extends within the cavity a distance not less than one-half the body length.
6 . The pin as claimed in claim 4 , wherein the cavity and member present congruent polygonal cross-sectional shapes, and the member is tightly receivable within the cavity, so as to prevent relative rotational motion, when the member is inserted into the cavity.
7 . The pin as claimed in claim 4 , wherein the cavity and member present congruent star shaped cross-sections, and the member is tightly receivable within the cavity, so as to prevent relative rotational motion, when the member is inserted into the cavity.
8 . The pin as claimed in claim 4 , wherein the cavity is tapped and the member is threaded, so that the member is adjustably inserted within the cavity.
9 . The pin as claimed in claim 1 , wherein the first material is a technical ceramic.
10 . The pin as claimed in clam 1 , wherein the second material is 4140 steel alloy.
11 . The pin as claimed in claim 1 , wherein the body and post cooperatively define a longitudinal co-axis and first and second ends in the assembled condition, and a stop spaced from the ends.
12 . The pin as claimed in claim 1 , wherein the stop is equally spaced from the ends.
13 . The pin as claimed in claim 4 , wherein the cavity defines a constant cross-sectional diameter equal to 6.00 mm, and the member presents a constant cross-sectional diameter equal to 5.75 mm.
14 . A composite locating pin adapted for use with a welding apparatus and for locating and securing a plurality of workpieces in a fixed relative condition during a welding cycle, wherein slag is generated, said pin comprising:
a pin body formed of a first material generally resistant to deformation and adhesion to the slag, wherein said first material is electrically and thermally insulative;
a post formed of a second material having lateral bending, tensile and shearing strengths greater than the first material, and configured to be securely interconnected with the apparatus, said body and post being mated pairs, and cooperatively configured so as to be securely interfitted in an assembled condition; and
a locking mechanism configured to hold the pin and post in the assembled condition,
said body defining a longitudinal cavity,
said post presenting an elongated member,
said cavity and member being cooperatively configured so that at least a portion of the member is receivable within the cavity, the cavity defines a constant cross-sectional diameter within a range of 4 to 8 mm and the member presents a constant cross-sectional diameter within a corresponding range of 3.75 to 7.75 mm.
15 . A composite locating pin adapted for use with a welding apparatus and for locating and securing a plurality of workpieces in a fixed relative condition during a welding cycle, wherein slag is generated, said pin comprising:
a pin body formed of a technical ceramic;
a post formed of a steel alloy, and defining a tapped hole so as to be securely connected to the apparatus by a bolt fastener; and
a loctite adhesive layer intermediate surfaces defined by the body and post,
said body and post being mated pairs, and cooperatively configured so as to be securely interfitted in an assembled condition.