SU839702A1

SU839702A1 - Casting mould for producing hollow polymeric articles

Info

Publication number: SU839702A1
Application number: SU792822314A
Authority: SU
Inventors: Семен Яковлевич Рабинович; Вячеслав Тимофеевич Юдин
Original assignee: Специальное Конструкторско-Техно-Логическое Бюро Филиала Производст-Венного Объединения "Укрпластик"
Priority date: 1979-09-07
Filing date: 1979-09-07
Publication date: 1981-06-23

Description

Изобретение относится к переработке пластмасс в изделия, в частности, для изготовления полых изделий.The invention relates to the processing of plastics into products, in particular for the manufacture of hollow products.

Известна литьевая форма для изготовления полых полимерных изделий, содержащая подвижную и неподвижную полуформы, j выталкивающее устройство, выполненное в’ виде рычажного параллелограммного механизма, сталкивающую планку, пуансон, связанный с рычажным механизмом, и размещенный в подвижной полуформе выталкиватель центрального литника [1]. 10Known injection mold for the manufacture of hollow polymeric products, containing a movable and fixed half-molds, j ejector device made in the form of a lever parallelogram mechanism, pushing the bar, a punch connected to the lever mechanism, and a central gate ejector [1]. 10

При раскрытии известной формы скорость пуансона с изделием меньше, чем скорость подвижной полуформй. Для выдергивания пальцевого литника на подвижной части формы устанавливается зацеп.When disclosing a known shape, the speed of the punch with the product is less than the speed of the moving half-molds. To pull the finger gate on the movable part of the form, a hook is installed.

Недостатком формы является то, что благодаря зацепу литниковая система движется со скоростью подвижной части формы, а изделия вместе с впускными литниками перемещаются с меньшей скоростью, что приводит к браку изделий на поверхности _мпо месту отрыва литников и деформированию формующих частей формы.A drawback of the mold is that, thanks to the hook, the gating system moves with the speed of the movable part of the mold, and the products, together with the inlet gates, move at a lower speed, which leads to the rejection of the products on the surface _m at the place of the gates separation and deformation of the forming parts of the mold.

Цель изобретения — улучшение качества изделий.The purpose of the invention is the improvement of product quality.

Поставленная цель достигается тем, что литьевая форма для изготовления полых полимерных изделий, содержащая подвижную и неподвижную полуформы, выталкивающее устройство, выполненное в виде рычажного параллелограммного механизма, сталкивающую планку, пуансон, связанный с рычажным механизмом, и размещенный в подвижной полуформе выталкиватель центрального литника, снабжена контртолкателем и упругим элементом, размещенными в подвижной полуформе, и рычагом, шарнирно закрепленным одним концом на подвижной полуформе и контактирующим свободным концом с контртолкателем, а средней частью с одной стороны контактирующий с упругим элементом, а с противоположной стороны — с выталкивателем центрального литника, который подпружинен относительно подвижной полуформы в сторожу рычага.This goal is achieved by the fact that the injection mold for the manufacture of hollow polymer products, containing a movable and fixed half-molds, an ejector device made in the form of a lever parallelogram mechanism, pushing the bar, a punch connected to the lever mechanism and placed in the movable half-mold, the ejector of the central gate is provided counter-pusher and an elastic element placed in a movable half-mold, and a lever pivotally fixed at one end on the movable half-mold and contacting freely the bottom end with a counter-pusher, and the middle part on the one hand in contact with the elastic element, and on the opposite side, with the ejector of the central gate, which is spring-loaded relative to the movable half-mold to the guard of the lever.

Кроме того, расстояния точек контакта контртолкателя и выталкивателя центрального литника до оси шарнирного крепления рычага относятся как 2:1.In addition, the distance of the contact points of the counter-pusher and the ejector of the central gate to the axis of articulation of the lever are 2: 1.

На чертеже изображена литьевая форма, общий вид.The drawing shows an injection mold, General view.

Литьевая форма содержит подвижную 1 и неподвижную 2 полуформы, рычажный параллелограммный механизм 3, рычаги которого шарнирно связаны с полуформами, сталкивающую планку 4, плиту 5, на которой закреплен пуансон 6, подпружиненный 5 выталкиватель 7 центрального литника, шарнирно закрепленный в подвижной полуформе рычаг 8 на оси 9 кронштейна 10, а свободном концом контактирующим с контртолкателем 11, упирающимся в неподвижную полуформу 2. Рычаг 8 средней частью опирается на упругий элемент 12, выполненный в виде рессоры, и контактирует с выталкивателем 7 центрального литника.The injection mold contains a movable 1 and a fixed 2 half-molds, a lever parallelogram mechanism 3, the levers of which are pivotally connected to the half-molds, pushing the bar 4, a plate 5 on which a punch 6 is fixed, a spring-loaded ejector 7 of the central gate, a lever 8 pivotally mounted in the movable half-mold axis 9 of the bracket 10, and the free end in contact with the counter-pusher 11, abutting against the fixed half-mold 2. The lever 8 in the middle part rests on the elastic element 12, made in the form of a spring, and is in contact with the ejector 7 it sprue.

Литьевая форма работает следующим образом.Injection mold works as follows.

Расплав термопласта подают в сомкнутую форму. По окончании цикла заливки форма раскрывается, в этот момент пуансон с изделием имеют скорость в два раза меньшую, чем скорость полуформы 1. Для предотвращения отрыва литников при. раскрытии формы толкатель с рессорой 12 через рычаг 8 прижимается к полуформе 2, а ось рычага 9 с кронштейном 10 движется вместе с полуформой 1; средняя часть рычага 8 и выталкиватель 7 литника, к которому она прижимается, движутся со скоростью, вдвое меньшей, чем ось 9, благодаря соотношению расстояний точек контакта контртолкателя и выталкивателя до оси шарнирного крепления рычага, равное 2:1, т. е. со скоростью пуансонов и изделий, что предотвращает отрыв литника от изделия. Съем изделий с литниками с формы происходит с помощью рычажного механизма 3 и сталкивающей планки 4, перемещаемой по пуансону 6. Затем цикл повторяется.The molten thermoplastic is fed into closed form. At the end of the pouring cycle, the mold opens, at this moment the punch with the product has a speed half that of half mold 1. To prevent the gate from breaking off at. the disclosure of the form of the pusher with the spring 12 through the lever 8 is pressed against the half-mold 2, and the axis of the lever 9 with the bracket 10 moves together with the half-mold 1; the middle part of the lever 8 and the ejector 7 of the gate to which it is pressed move at a speed half that of the axis 9, due to the ratio of the distances of the contact points of the counter-pusher and the ejector to the axis of the hinged mounting of the lever, equal to 2: 1, i.e., with a speed punches and products, which prevents the gate from separating from the product. The removal of products with gates from the mold occurs using the lever mechanism 3 and the pushing bar 4, which moves along the punch 6. Then the cycle repeats.

Применение предлагаемой литьевой формы предотвращает брак изделий в месте отрыва литника и поломку формующих элементов формы.The use of the proposed injection mold prevents the rejection of products at the sprue gap and breakage of the forming elements of the mold.

Claims

(54) CASTING FORM FOR THE MANUFACTURE OF HOLLOW POLYMERIC PRODUCTS The casting mold contains a movable 1 and a fixed 2 half molds, a lever parallelogram mechanism 3, the arms of which are pivotally connected to the half molds, pushes the bar 4, plate 5, on which a plunger 5 is attached, and a substrate is pressed by a layer, which has a sub- layer that has a surface that has a surface that has a surface that has a surface that has a surface that is pushed by a backing layer 4, a plate 5 which is pushed onto a mold, and which pushes the bar 5, which is resting on a mold and is attached to a half-mold, which has a back surface 5 which has a back surface that has a surface that has a back surface that has a back surface that has a back surface that has a surface that has a backing layer that is pushed by a backing layer. gate, hinged in the movable half-form lever 8 on the axis 9 of the bracket 10, and free 1M end in contact with the counter-push 11, abutting the stationary half-form 2. The lever 8 rests on the middle part of the elastic element NT 12, made in the form of springs, and is in contact with the ejector 7 of the central sprue. Casting form works as follows. Thermoplastic melt served in the closed form. At the end of the pouring cycle, the mold opens, at this moment the punch with the product has a speed two times lower than the speed of the mold 1. To prevent the sprues from breaking off, the mold of the pusher with spring 12 through the lever 8 presses against the mold 2, and the axis of the lever 9 with bracket 10 moves with half-form 1; The middle part of the lever 8 and the ejector 7 of the sprue to which it presses moves at a speed half as large as the axis 9, due to the ratio of the contact points of the counter-pusher and the ejector to the axis of the hinged arm of the lever equal to 2: 1, i.e. speed punches and products, which prevents the separation of the sprue from the product. The removal of articles with sprues from the mold takes place with the help of the lever mechanism 3 and the pushing bar 4, which is moved along the punch 6. Then the cycle is repeated. The application of the proposed injection mold prevents the products from being scraped at the place where the sprue breaks off and the forming elements of the mold are damaged. Claim 1. Injection mold for the manufacture of hollow polymer products, containing movable and stationary half-molds, an ejector device made in the form of a lever parallelogram mechanism, pushing the bar, a punch associated with the lever mechanism, and an ejector of the central sprue located in the movable half-shape, characterized by in order to improve the quality of the products, it is equipped with a counter-pusher and an elastic element placed in the movable half-form, and a lever hinged at one end on the movable half-form and the contacting free end with the counter-pusher, and the middle part on one side in contact with the elastic element, and on the opposite side with the ejector of the central sprue, which is spring-loaded relative to the mobile half-form in the direction of the lever.

2. Casting mold according to claim 1, characterized in that the distances of the points of contact of the counter-pusher and ejector of the central sprue to the axis of the pivotal attachment of the lever are 2: 1. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 391945, cl. In 29 C 5/00, 1971 (prototype).

P