SU540906A1

SU540906A1 - Lubricant for hot metal forming

Info

Publication number: SU540906A1
Application number: SU2190096A
Authority: SU
Inventors: Людмила Петровна Михайлова; Александр Федорович Ничков
Original assignee: Предприятие П/Я В-8739
Priority date: 1975-11-17
Filing date: 1975-11-17
Publication date: 1976-12-30

Description

(хлоридонитратна ) и наполнитель графит Эта смазка не может быть использована прн гор чей ковке сферических поверхностей баллонов , так как она плавитс в диапазоне 200-300°С при 1000°С в очаге деформации с Образованнем жидкотекучего плава (в зкостью 0,06 пуаз) и стекает с поверхности ковочного инструмента-формовател . Известна смазка 8 дл гор чей обработки металлов, содержаща полиакриламид, графит и воду при следующем соотношении компонентов , вес. % : Полиакриламид8-10 Графит30-35 ВодаОстальное до 100 Однако полиакриламид в этой смазке сгорает при соприкосновении с заготовкой, нагретой до 1000-1200°С, вода испар етс , а оставшийс графит с окалиной не про вл ет достаточных смазочных и экранирующих свойств. Поэтому во врем деформации отсутствует разделительный слой, преп тствующий привариванию окалины и металла на инструмент . В результате чего происходит налипание металла на формователь, что приводит « снижению стойкости инструмента и по влению браковочных рисок, и скручивани металла. Целью данного предложени вл етс повышение качества обра батываемой поверхности за счет повышени экранирующих свойств смазочного сло . Поставленна цель достигаетс за счет того , что смазка на основе воды, графита и полиакриламида дополнительно содержит триполифосфат натри и синтетическое моющее средство при следующем содержании компогентов , вес. %: Графит20-40 Полиакриламид0,3-3 Триполифосфат натри 5-15 Синтетическое моющее средство0,05-0,5 Водадо 100 Смазку готов т, раствор полиакриламид в воде при посто нном перемешивании и при нагревании до 60-80°С или в специальном баке с механической мещалкой без подогрева. В полученный раствор полиакриламида ввод т водный раствор триполифосфата натри соответствующей концентрации. Затем добавл ют графит и синтетическое моющее средство . Смесь снова перемешивают.(chloride chloride) and graphite filler This lubricant cannot be used by hot forging the spherical surfaces of cylinders, as it melts in the range of 200-300 ° C at 1000 ° C in the deformation zone with a Formed flowable fluid (viscosity 0.06 poises) and drains from the surface of the forging tool-former. Known lubricant 8 for hot metal processing, containing polyacrylamide, graphite and water in the following ratio, wt. %: Polyacrylamide 8-10 Graphite 30-35 Water Else to 100 However, the polyacrylamide in this lubricant burns in contact with the workpiece heated to 1000-1200 ° C, the water evaporates, and the remaining graphite with scale does not show sufficient lubricating and shielding properties. Therefore, during the deformation there is no separation layer that prevents the welding of scale and metal on the tool. As a result, sticking of metal to the former takes place, which results in "a decrease in tool life and the appearance of rejecting marks, and twisting of the metal. The aim of this proposal is to improve the quality of the surface to be treated by increasing the shielding properties of the lubricating layer. This goal is achieved due to the fact that the lubricant based on water, graphite and polyacrylamide additionally contains sodium tripolyphosphate and a synthetic detergent for the next component content, wt. %: Graphite 20-40 Polyacrylamide 0.3-3 Sodium tripolyphosphate 5-15 Synthetic detergent 0.05-0.5 Vodado 100 Lubricant is prepared, a solution of polyacrylamide in water with constant stirring and when heated to 60-80 ° C or in a special tank with mechanical broom without heating. An aqueous solution of sodium tripolyphosphate of appropriate concentration is introduced into the resulting polyacrylamide solution. Then graphite and synthetic detergent are added. The mixture is stirred again.

Claims

Comparative performance table Polyacrylamide is incorporated into the lubricant as a cooling agent in order to increase tool life and its service life. The optimal addition of polyacrylamide is IB ranging from 0.3-3%, which increases the cooling capacity of the lubricant compared to ordinary water by 20-25%, and with a further increase in the concentration of polyacrylamide, the cooling property does not noticeably change, and the viscosity of the aqueous solution increases which leads to excessive lubricant consumption. Sodium tripolyphosphate is introduced into the lubricant to obtain a reliable release layer, i.e., in order to improve the shielding properties of the lubricants and the surface quality of the cylinders. Sodium tripolyphosphate interacts with scale on the surface of the cylinders, which is formed when they are preheated to 1000-1200 ° C. This results in a strong adhesion of the lubricant to the tool and a viscous melt in the deformation zone, which does not squeeze out at high pressure, being a reliable separating layer between the tool and the metal. This, in turn, prevents the metal from sticking to the former, increasing its service life and ensuring the high surface quality of the cylinder being processed. The presence of 5% by weight sodium tripolyphosphate in the lubricant creates a system with a viscosity of 0.085 poises, with an increase in the tripolyphosphate content of up to 15%, the viscosity increases to 0.18 poise, i.e. a decrease or increase in the sodium tripolyphosphate content leads to a corresponding change in viscosity lubrication system in the deformation zone. The limits of sodium tripolyphosphate concentration are determined by the limited possibility of its interaction with scale, so below 5 or more than 15% the content of tripolyphosphate does not give the desired effect. The addition of detergent to the lubricant composition eliminates contamination of the forging tool, thereby improving the adhesive properties of the lubricant. For these purposes soap or any synthetic detergent can be used, for example, the non-ionic detergent SP-10 or OP-7. Comparative tests of the proposed and known lubricants were carried out (table). Recipe known lubricant weight. %; Graphite35 Polyacrylamide 5 Water60 Formulation of the proposed lubricant, weight. %: Graphite32 Polyacrylamide1 Sodium tripolyphosphate 10 OP-100.1 Vodado 100 As can be seen from the table, when using from: a well-known lubricant (ed. Mon. No. 300502), welding of scale occurs to the tool (molder), which makes it necessary to clean it from welding scale. every 10-15 cylinders. In this case, defects appear on the surface of the cylinders. Tests have confirmed that the proposed lubricant, when spherical surfaces of cylinders are molded from hard-to-deform steel at a temperature of 900-1000 ° C, provides a viscous (0.18 poise) melt and corresponding shielding properties. The proposed lubricant provided a yield of 950-990 suitable products (per 1000 products), while a known lubricant provided only 580-600 suitable products. The invention is a lubricant for hot metal forming based on water, graphite and polyacrylamide, characterized in that, in order to improve the quality of the surface being treated, the lubricant additionally contains sodium tripolyphosphate and synthetic detergent for the next content of components, wt. %: Graphite 20-40 Polyacrylamide 0.3-3 Sodium tripolyphosphate 5-15 Synthetic detergent 0.05-0.5 Vodado 100 Sources of information taken into account during the examination: 1.Avt. swith USSR № 404843, S YuM7 / 02, 1973.

2. Avt. swith USSR Js 432173, S YuM 3/02, 1974.

3. Avt. swith USSR № 414294, S YuM 5/02, 1974.

4. Avt. swith USSR 380693, S YuM 7/02, 1973.

5. Avt. swith USSR № 457715, S YuM 7/04, 1975.

6.Avt. swith USSR № 450829, S YuM 3/02, 1974.

7. Avt. swith USSR № 335269, S YuM 3/22, 1972.

8. Avt. swith USSR 300502, S YuM 3/02, 1971.