| 摘要 |
491,658. Grinding-wheels etc.; moulding. TENNANT, W. J. (Carborundum Co.) March 6, 1937, No. 6704. [Class 60] [Also in Group V] An abrasive wheel or other tool having a working surface composed of a thin layer of particles of diamond, boron carbide, or other costly abrasive, is formed by placing a thin strip of paper, cloth or metal 4, coated with an adhesive 5 and grains 6 of the abrasive, which may be oriented to present their major axes normally to the surface of the strip, with the layer 6 innermost, in the barrel 1 of a mould, the strip 4, or a removable thin metal ring, supporting the cap 7 of the mould, which cap is held by a clamping member 9. The body of the mould is filled with plastic material 12, for example, a phenolic condensation product resin, a thermoplastic material, or rubber mixed with vulcanizing materials and fillers and including abrasive grit, and the material is compressed by the plunger 11 of the mould whilst this is located between steam heated platens 21, 22, the material 12 thus being hardened and adhering to the grains 6; the layer 4 may be removed by lapping or by dissolving the adhesive layer 5. A wheel for grinding with its flat face is formed similarly, as also is a wheel employing the flat face and the periphery. A wheel of the form shown in Fig. 7 has the abrasive strip slotted longitudinally and bent to fit the conical faces of the core 24. A layer of silicon carbide &c. may be secured to the layer 6 by an adhesive, so as to form an annulus on the wheel beneath the layer 6 of diamond &c. grains. Specification 454,474 is referred to. |
