SU797883A1

SU797883A1 - Mould with break-off gates for polymeric articles

Info

Publication number: SU797883A1
Application number: SU782682209A
Authority: SU
Inventors: Эмма Сергеевна Виноградова; Роман Павлович Занин
Original assignee: Всесоюзный Научно-Исследовательскийтехнологический Институт Приборо-Строения
Priority date: 1978-11-02
Filing date: 1978-11-02
Publication date: 1981-01-23

Description

Изобретение относится к переработке пластмасс и может быть использовано ... ' при изготовлении изделий с отверстиями, не допускающих образования около отверстий раковин и холодных спаев.The invention relates to the processing of plastics and can be used ... 'in the manufacture of products with holes that prevent the formation of holes near the holes and cold junctions.

Известна литьевая форма для формования полимерных изделий, содержащая формующие плиты и подпружиненный стержень И·Known injection mold for molding polymer products containing molding plates and a spring-loaded rod And

Однако в известном устройстве подпружиненный стержень компенсирует усадку за счет дополнительного расхода материала, при этом в случае изготовления отверстия не исключается образование раковин около отверстий изделия.However, in the known device, the spring-loaded rod compensates for shrinkage due to the additional consumption of material, while in the case of making holes, the formation of shells near the holes of the product is not excluded.

Наиболее близким техническим решением.к предлагаемому является литьевая форма с отрывными литниками для полимерных изделий, содержащая неподвижную плиту с размещенными в ней задержками литников, плиту съема литников, связанную с неподвижной плитой, подвижную плиту, связанную с плитой с формую2 ; щими полостями, и плиту с разводящими и впускными литниковыми каналами [2J.The closest technical solution to the proposed one is an injection mold with tear-away gates for polymer products, containing a fixed plate with gate gates placed in it, a gate removal plate connected to a fixed plate, a movable plate connected to the mold plate 2; cavities, and a plate with distributing and inlet sprue channels [2J.

Недостатком форм такой конструкции является невозможность полностью устранить образование раковин и холодных спаев при изготовлении изделий с отверстиями.The disadvantage of the forms of this design is the inability to completely eliminate the formation of shells and cold junctions in the manufacture of products with holes.

Цель изобретения - повышение качества изделий при изготовлении в них отверстий.The purpose of the invention is to improve the quality of products in the manufacture of holes in them.

Поставленная цель достигается тем, что литьевая форма с отрывными литниками для полимерных изделий, содержащая неподвижную плиту с размещенными в ней задержками, литников, плиту съема литников, связанную, с неподвижной плитой, подвижную плиту, связанную с плитой с формующими полостями, и плиту с разводящими и впускными; литниковыми каналами, снабжена размещенными в плите с литниковыми каналами подпружиненными в сторону плиты съема стержнями, каждый из которых выполнен со ступенчатым отверстием для сообщения разво— дящего канала с формующей полостью, примем ступенчатое отверстие большим диаметром обращено к разводящему каналу, ; а меньшим диаметром к формующей полости. / , jThis goal is achieved by the fact that the injection mold with tear-away gates for polymer products, containing a fixed plate with delays placed in it, gates, a gating plate, connected, with a fixed plate, a movable plate connected with a plate with forming cavities, and a plate with distributing and inlet; the sprue channels, equipped with rods placed in the plate with the sprue channels, rods spring-loaded towards the removal plate, each of which is made with a stepped hole for communicating the spreading channel with the forming cavity, let us take a stepped hole with a large diameter facing the distributing channel,; and a smaller diameter to the forming cavity. /, j

На фиг. 1 изображена, форма в сомкнутом пЬложении; на фиг. 2 - го же, в разомкнутом положении.In FIG. 1 depicts a closed form application; in FIG. 2nd, in the open position.

Литьевая форма содержит неподвижную плиту 1, связанную с ней плиту 2 10 сьема ΗΗτίίΗκοΒψ; подвижную плиту 3, плиту 4 с формующими полостями 5, связанную с подвижной плитой, плиту 6 с разводящими 7 и впускными 8 литниковыми каналами, плиту 9 с выталкивате* 15 лями 10 изделий.The mold contains a fixed plate 1, a plate 2 associated with it 10, removal ΗΗτίίΗκοΒψ; a movable plate 3, a plate 4 with forming cavities 5, connected with a movable plate, a plate 6 with distributing 7 and inlet 8 gating channels, a plate 9 with an ejector * 15 ily 10 products.

в . В неподвижной плите 1 закреплены задержки 11 литников, а в плите 6 установлены подпружиненные пружинами 12 стержни 13, выполненные каждый со сту- 20 пенчатым отверстием 14 для сообщения разводящего канала с формующей полостью причем большим диаметром отверстие ι обращено к разводящему каналу, а меньшим - к формующей полости. ²⁵ in . In the fixed plate 1, delays of 11 sprues are fixed, and in the plate 6, springs 13 spring-loaded 12 are installed, each made with a 20-step hole 14 for communicating the distributing channel with the forming cavity, the larger diameter of the opening ι facing the distributing channel, and the smaller one facing forming cavity. ²⁵

Форма ^работает следующим образом. В начале заполнения формы расплав Термопласта из разводящего литникового канала 7 через точечные впуски заполняет формующие полости 5, ступенчатые от- 30 верстия 14 стержней 13. При повышении давления расплава формующие отверстия стержней 13, преодолевая сопротивление пружин 12, перемещаются, вдвигаясь в формующие, полости 5 под действием раз- 35 ности сил давления, возникающей благодаря тому, что площадь отверстия, обращенного к разводящему каналу, больше формующей части стержней.Form ^ works as follows. At the beginning of filling the mold, the Thermoplast melt from the distributing sprue channel 7 through the point inlets fills the forming cavities 5, stepwise 30 holes 14 of the rods 13. With increasing melt pressure, the forming holes of the rods 13, overcoming the resistance of the springs 12, move, moving into the forming cavities 5 under the action of the difference in pressure forces arising due to the fact that the area of the hole facing the distributing channel is larger than the forming part of the rods.

При этом стержни отодвигаются от 40 плиты 2 съема литников и открывают доступ расплаву из разводящих каналов 7 к стержням 13. ·In this case, the rods are moved away from the 40th plate 2 of the gates and open the melt from the distributing channels 7 to the rods 13. ·

Расплав термопласта, подаваемый к стержням непосредственно из разводящего 45 литникового канала, надежно прижимается к плите 1 (фиг. 1).The molten thermoplastic supplied to the rods directly from the distributing channel 45 gating channel, reliably pressed against the plate 1 (Fig. 1).

Раскрытие формы начинается с раскрытия по плоскости разъема между плитами б и 2. При этом задержки 11 извлекают 50 затвердевший термопласт из отверстий стержней, точечных впусков и разводящих литниковых каналов.The opening of the form begins with the opening along the plane of the connector between plates b and 2. At the same time, delays 11 remove 50 hardened thermoplastics from the holes of the rods, pin inlets and distributing gate channels.

Затем раскрытие следует по плоскости между плитой съема литников и неподвижной плитой. При этом литник извлекается из литниковой втулки, снимается с задержек 11 и удаляется из формы. Только после этого начинается раскрытие формы по основной плоскости ее раскрытия между плитами 6 и 4. В конце раскрытия формы выталкиватели извлекают изделия!5.Then the disclosure follows in a plane between the gate removal plate and the fixed plate. In this case, the sprue is removed from the sprue sleeve, removed from the delays 11 and removed from the mold. Only after this begins the disclosure of the form along the main plane of its disclosure between plates 6 and 4. At the end of the disclosure of the form, the ejectors remove the products! 5.

Такое выполнение формы обеспечивает равное течение расплава термопласта без разделения потока и образования холодных спаев и раковин.This embodiment of the mold ensures equal melt flow of the thermoplastic without flow separation and the formation of cold junctions and shells.

Claims

The invention relates to the processing of plastics and can be used in the manufacture of products with openings that prevent the formation of sinks and cold junctions around the holes. A casting mold for molding polymer products is known, which includes molding plates and a spring-loaded rod {JQ. However, in the known device, the spring-loaded rod compensates for shrinkage due to additional material consumption, and in the case of manufacturing the hole, the formation of sinks around the product holes is not excluded. The closest technical solution to the present invention is a casting mold with detachable sprues of polymer products containing a fixed plate with delays of sprues placed in it, a plate for removing sprues related to a fixed plate, a movable plate associated with a plate with molds, cavities, and a plate with razvodimi and inlet gating channels 2 The disadvantage of the forms of this design is the inability to completely eliminate the formation of sinks and cold junctions in the manufacture of products with holes. The purpose of the invention is to improve the quality of products in the manufacture of holes in them. The goal is achieved by the fact that the casting form with tear-off sprues for polymer products, containing a fixed plate with delays placed in it, sprues, a sprue plate, connected with a fixed plate, a movable plate associated with the plate with forming cavities, and plate with parting and inlet; gating channels, equipped with rods placed in a plate with gating channels, springed in the direction of the removal plate, each of which is made with a stepped hole to communicate the expansion channel with the forming cavity, let us take a stepped hole of large diameter facing the divider Caval, ; and smaller diameter to the forming cavity, /, FIG. 1 depicts a form in a closed n & Fig 2 is the same in the open position. The mold has a fixed plate 1, a plate 2 for removing sprues associated with it; movable plate 3, plate 4 with forming cavities 5, sv. connected with a movable plate, a plate 6 with a diverting 7 and inlet 8 gating channels, a plate 9 with ejectors of 10 products. 11 sprues are fixed in the fixed plate 1, and the springs 12 are installed in the plate 6 and the springs 13 are spring-loaded, each are made with a step out hole 14 to communicate the separating channel with the cavity. with the larger diameter, the hole i faces the dilating channel, and the smaller one - to the forming cavity,. The form is concerned as follows. At the beginning of filling the mold, the melt of the Thermoplastic from the diverting gate 7 fills the forming cavities 5, stepped from the top 14 rods, through dot inlets. When the pressure of the melt increases, the forming holes of the rods 13 move over the resistance of the springs 12 and move 5 under the action of the difference in pressure forces arising due to the fact that the area of the orifice facing the diverting channel is larger than the forming part of the strippers. In this way, the rods are moved away from the sprue plate 2 and open to the melt from the diverting channels 7 to the rods 13. The thermoplastic melt supplied to the rods directly from the spar gating channel is reliably pressed to the plate 1 (Fig. 1). The opening of the form begins with the opening along the plane of the connector between the plates 6 and 2. At the same time, the delays 11 extract the hardened thermoplastic from the holes of the 3 rods, the point inlets and the distributing channels. Then the disclosure follows a plane between the sprue plate and the fixed plate. The sprue is removed from the sprue bushing, removed from delays 11 and removed from the mold. Only after this begins the opening of the form along the main plane of its opening between the plates 6 and 4. At the end of the opening, the ejector ejects the product 5. Such an embodiment of the form ensures an equal flow of the thermoplastic melt without splitting the flow and forming cold joints and cavities. The invention of the Injection Molded Form with tear-off sprues for polymer products, comprising a fixed plate with placed gate delays, a plate for removing sprues associated with a fixed plate, a movable plate associated with the plate with forming cavities, and a plate with diverting and inlet gating channels, characterized in that, in order to improve the quality of the products when making holes in them, it is provided with rods placed in a plate with gating channels biased towards the removal plate and each of them made with a stepped hole for communicating the diverting channel with the forming cavity, wherein the stepped hole of large diameter is facing the diverting channel; and smaller diameter to the molding cavity. . Sources of information taken into account in the examination 1. Plastics in mechanical engineering. Ed. Zavgorodniy V. K., M., State Scientific / Technical Publishing House, engineering literature, 1959, p. 132.

2. Ivanov V.K. Designing of automatic injection molds for parts from Thermoplastics, Leningrad House of Scientific and Technical Propaganda, 1970, p. 12-14, fig. 6 (prototype).