SU975175A1

SU975175A1 - Casting mould

Info

Publication number: SU975175A1
Application number: SU813296026A
Authority: SU
Inventors: Валерьян Михайлович Архипов; Михаил Самуилович Качан; Виктор Иванович Мишнев; Сергей Михайлович Петухов
Original assignee: Новосибирский электротехнический институт
Priority date: 1981-05-26
Filing date: 1981-05-26
Publication date: 1982-11-23

Description

(54) ЛИТЕЙНАЯ ФОРМА(54) CASTING FORM

Изобретение относитс к технологии машиностроени и может быть использовано в литейном производстве, в частности при изготовлении полых отливок.The invention relates to mechanical engineering technology and can be used in the foundry industry, in particular in the manufacture of hollow castings.

Известна литейна форма, содержаща стержень и пористую пластмассовую жеребейку 1.A known mold containing a rod and a porous plastic foal 1.

Однако известное техническое решение не позвол ет получать качественные отливки, так как части жеребейки / соприкасающиес с рабочей полостью формы или стержн , обволакиваютс в процессе заливки расплавом , crbpcUOT и образуют газовые раковины в отливке.However, the known technical solution does not allow to obtain high-quality castings, since parts of the foal / molds or cores in contact with the working cavity envelop in the process of melt pouring, crbpcUOT and form gas shells in the casting.

Наиболее близкой по технической сущности и достигаемому эффекту вл етс литейна форма, содержаща рабочую полость, стержень, расположенный в рабочей полости, и жеребейку , изготовленную из легковосплг1мен ющихс материалов 2.The closest in technical essence and the achieved effect is a mold, containing a working cavity, a rod located in the working cavity, and a foal made of highly reproducible materials 2.

В форме выполнены две дополнительные полости, одна из которых расположена на рабочей поверхности нижней полуформы и предназначена дл приема жеребейки, а друга находитс на рабочей поверхности нижней полуформы симметрично первой и в нейIn the form there are two additional cavities, one of which is located on the working surface of the lower half-form and is intended for receiving the foal, and the other is located on the working surface of the lower half-form symmetrically with the first and in it

установлен подвижно магнит, взаимодействующий с жеребейкой при ее удалении .A movable magnet is installed that interacts with the foal when it is removed.

Однако эта литейна форма не позвол ет получать качественные отливки вcлeдctвиe того, что расплав намораживаетс на жеребейку и при ее дальнейшем удалении намороженные элементы попадают в тело отливки и образуют неспаи.However, this casting mold does not allow to obtain high-quality castings due to the fact that the melt is frozen in the foal and with its further removal, frozen elements enter the body of the casting and form nespai.

Цель изобретени - повышение .качества отливки.The purpose of the invention is to improve the quality of the casting.

Поставленна цель достигаетс тем, что в литейную форму, содержащую литниковую систему, рабочую полость, стержень, расположенный в pa6o4efj полости и жеребейку, изготовленную из легковоспламен ющихс материалов, введен тепловой мост из материалов с высокой температуропроводностью,, например графита, и установленный между жеребейкой и литниковой системой .The goal is achieved by the fact that a thermal bridge made of materials with high thermal diffusivity, such as graphite, is installed in a mold containing a gating system, a working cavity, a rod located in the pa6o4efj cavity and a foal made of flammable materials gating system.

На фиг. 1 изображена литейна форма до заливки ее расплавом; на фиг. 2 -то же, момент отделени жеребейки от рабочей полости литейной формы.FIG. 1 shows a casting mold before melting it; in fig. 2 the same, the moment of separation of the foal from the working cavity of the mold.

Claims

The mold consists of the lower half-form 1, the upper half-form 2, the working cavity J, the rod 4, the foal 5, the heat bridge b, the casting system 7. During the pouring process, a gap 8 is formed between the working cavity and the die-pot. The mold is as follows. During the molding process, a thermal bridge 6 made of materials with high thermal diffusivity, such as graphite, is molded into the upper mold half. In the lower semi-flange 1, one end of the rods 4 is installed, on the other end of which the foal 5 is installed (the foal 5 can be pre-installed in the upper mold half 2) so that it touches the thermal bridge b. Then, the casting mold is assembled. In the process of pouring the melt into the gating system 7, the heat bridge 6 is heated and melts a part of the foal 5 adjacent to the heat bridge 6 and, accordingly, to the surface of the working cavity 3, resulting in a gap 8 between this surface and the foal 5. by raising the melt in the working strip 3, the colt 5, since it is much easier to melt, is removed from the working cavity 3, while burning on the surface of the melt and not falling into the body of the casting. After the castings are removed, the cycle is repeated. Thus, the foal in the process of pouring is not held by the surface of the working cavity, since it does not touch it at the time of the approach of the melt and does not form gas holes in the body on the cavity from pouring. f. At present, the departments of applied mechanics and instrument devices of the Novosibirsk Electrotechnical Institute have tested a mold with a thermal bridge between the colt and the gating system, and working drawings for tooling have been developed to produce one of the products at the Kasli machine-building plant. When the proposed mold was introduced into production for the manufacture of one of the products, the annual economic effect in the amount of 84,000 rubles was obtained. due to the exclusion of scrap castings from gas-shells, which is previously 4%. The invention of the Foundry form, comprising a gating system, a working cavity, a rod, located in the working cavity, and a foal made of highly inflammable materials, with the fact that, p. In order to improve the quality of the casting, it is equipped with a thermal bridge made of a material with high thermal diffusivity, for example, graphite, installed between the colt and the sprue system. Sources of information taken into account in the examination 1. US patent 3496989, cl. 164-30, published. 1974.

2. USSR author's certificate number 481362, cl. B 22 C 9/00, 1974.