Flaremaking Essay

3737 words - 15 pages

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FLARE MAKING

© Philips Lighting B.V. (department I.S.G.T.) 2002 All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior permission of Philips Lighting B.V., dept. I.S.G.T. - the Netherlands.

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INFORMATION FOR THE MECHANICAL GLASS HANDLING COURSE

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-------------------------------------------------------------------------------------------------------------subject: Flare making.

contents: 1. 2. 3. 4. 5. 6. 7. 8. 9. General product requirements. Cracking off by thermal shock. Flanging. Cooling. ...view middle of the document...

V., dept. I.S.G.T. - the Netherlands.

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2. CRACKING OFF.

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Relative positioning of burner and scratching wheel. The scratch has to be made exactly in the zone of the maximum thermal strain. This means in the centre of the heated zone. This zone must be as small as possible. The crack will start from the scratch and will follow the highest strain.

If the scratch is not situated in the zone with the maximum strain, the crack will move from the initiating point e.g. the scratch, towards the zone with the highest strain. This causes stepping or waving of the crack. Specially ‘stepping’ may cause axial cracks in the stemtube, causing rejects during stemmaking. (cracked stemtube).

Although these types of crack may seem very small and sometimes can be closed again during glazing of the cutting rim, they must be avoided.

As a starting point for the adjustment of the correct burner height, the height level of the scratch can be compared to the height level of the burner. For this adjustment the machine has to driven by hand, from the scratching wheel position back to the burner position. In most cases this will not be the final adjustment, but it does give a good starting point for proper adjustment.

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© Philips Lighting B.V. (department I.S.G.T.) 2002 All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior permission of Philips Lighting B.V., dept. I.S.G.T. - the Netherlands.

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Positioning of the scratching wheel: The scratching wheel must be positioned horizontally in all directions. The axis of the wheel holder must be directed towards the centre of the machine. The wheel must be well fixed and its bearing must be stable. Since we meet a number of tolerances, such as positioning of the heads, outer diameter of the glass tubes etc. the adjustment of the scratching wheel in radial direction of the machine is somewhat questionable with respect to the scratching depth. A compromise has to be found between on one side the combination of the smallest glass tube diameters and the heads positioned somewhat inwards to the machine and on the other side the biggest tube diameters and heads positioned somewhat outwards. Also the speed of touching has some influence. As a guide line, a scratch with a length of 2 to 4 mm is an indication of a correct adjustment. The spring force must be set so that all tubes will be scratched. It should not be so strong that mechanical damage (chips, cracks) are observed. The scratching wheel has to be sharp and grinded correctly. (see GLV 109-15-25 pages 310-312). Positioning of the burner and flame setting: The burner has to be positioned horizontally in all directions. The axis of the burner must be directed towards the centre of the machine. The flame has to be parallel with the axis of the burner (check for correct...

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