SU1423239A1 - Lubricating coat for hot plastic metal working - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to technological lubricating coatings for the hot working of metals by pressure. The goal is to improve the quality of lubrication of the details of parts by removing scale from them. The lubricating coating contains sawdust, novolac phenol-formaldehyde resin in the following ratio of ingredients, wt.%: Sawdust 75-80; resin SF-015 1,5-3,5; water - the rest. When stamping hot billets, the lubricating coating of the indicated composition ensures complete removal of scale from the surface of the deformable billet. 2 tab.

Description

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The invention relates to the processing of metals by pressure, namely to lubricants used in hot processing.

The purpose of the invention is to improve the quality of lubrication of the surfaces of parts due to the removal of scale from them.

The lubricant is prepared as follows. Sawdust is dried and heated to 120-150 ° C, and then mixed with resin SF-015. Heating the sawdust below 120 ° C slows down and degrades the enveloping of their surface with a layer of SF-015 resin, and when heated above 150 ° C, part of the sawdust can be burned and charred.

Immediately before use, the treated sawdust is moistened with water, this is necessary to prevent the sawdust from being blown off the die surface with a stream of air at the moment they are thrown onto the stamp. With strong moisture (more than 25% water), there is an uneven distribution of sawdust on the die surface due to their clumping. When moistening less than 0%, a portion of the sawdust is blown away by the air flow. Therefore, in the composition of the lubricating coating, the content of sawdust is 75-80%. I In contact with the surface of a stamp having a temperature of 350-450 ° C, a layer of SF-015 resin, enveloping sawdust, melts and holds sawdust on the surface of the stream figure, regardless of its configuration and depth, to form a uniform layer of lubricating coating.

The content of novolac phenol-formaldehyde resin SF-015 in the lubricant coating is 1.5-3.5%.

As tests have shown, an increase in the percentage of resin SF-015 of more than 3.5% does not contribute to a better removal of scale on the deep cavities of the figure), and a decrease in its amount of less than 1.5% leads to insufficient grip of sawdust with the stream | i on a deep cavity the die of the stamp does not form a uniform layer of lubricating coating.

Example. For industrial testing, three lubricant compositions were prepared, the components of which are within the specified limits (see Table 1, compounds 2–4) and two beyond the boundary values of the limits (compositions I and 5).

For comparison, the results were tested: grease 6, containing wetted sawdust, and grease 7, containing

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sawdust and liquid glass deposited on a sheet of paper. Their compositions are listed in Table. No. 1.

Each type of lubricant was tested when the part was stamped. The bearing was on a hammer with a weight of falling parts of 10 tons. The series of parts consisted of 15 pieces.

After stamping, the blanks were cooled and visually inspected to determine the degree of scale removal from the surface. These data are given in table. No. 2

When stamping with lubricant 6, it was not possible to obtain a uniform lubricant coating of the die's die and stamped dross remained on the surface of the workpiece. Lubrication 7 with a uniform surface coating, the brook did not form a lubricant layer in the deep shtampa cavity, and the surface of the workpiece in this place also had traces of residual scale. The lubricant composition 1 provided a partial coating of the deep cavity of the brook with an uneven layer of lubricating coating and traces of stamped scale were also observed on the surface of the workpiece. The composition of greases 2, 3 and 4 evenly covered with a layer of grease the entire surface of the stream, including the deep cavity. When using these compounds, it was possible to obtain the cleanest surface of the workpiece without any marks of stamped scale.

Lubrication 5, forming on the surface of the figure a stream of a stamp, as well as lubricants 2, 3 and 4, a uniform layer, does not improve the surface quality of the workpiece.

Thus, the compositions of lubricants 2, 3 and 4 have high lubricating properties in comparison with the known compositions of lubricants and provide high surface quality of the workpieces.

Claims (1)

Invention Formula five 0 five 40 Lubricating coating for hot metal forming, containing sawdust and water, characterized in that, in order to improve the quality of lubricating the surfaces of parts by removing scale from them, it additionally contains 5 novolac phenoloformaldehyde resin SF-015, in the following ratio in50 gradedov, wt.%: Sawdust Resin SF-015 Water Table 1 The compositions of the tested lubricants Ingredients Ingredients content, wt.% . Sawdust 75-80 75-80 75-80 75-80 75-80 75-80 35-55 Resin SF-015 1 1.5 2.0 3.5 4.5 4.5 Liquid glass - - - - - -, 20-30 Paper-3 Water Remaining - Remaining - Remaining - Remaining - Remaining - Remaining - "- -" - "iia." "-". "". "...". .., | - ..--. Table 2 The degree of removal of scale from the surface of the forgings Indicator Indicators for types of lubricants,% state 1J1 t surface1 2 I 3 4 5 6 7 stamping Percentage ud-67-72 85-92 86-90 96-95 85-90 62-74 70-78 laziness of scale from the surface of the stampings (series of 15 parts)