SU770643A1 - Injection mould - Google Patents

Description

(54) PRESS FORM

I

The invention relates to a foundry industry and is intended for the manufacture of models in the production of casting on melted models; It can be used in molds for injection molding metals and plastics.

Molds for casting on produced models are known with a device for advancing the pushing out of models, which is intended to protect the models from being hit by protruding tappets when they are pushed out of the mold 1.

During translational motion, the central sleeve rotates, slides with its spiral grooves along the puffs moved in the grooves of the rod, made with a smaller elevation angle; there is a progressive advance of the sleeve relative to the tubular and pin pushes.

The advance mechanism is difficult to manufacture, assemble and repair, quickly goes down.

The closest technical solution to the invention is a mold with a two-stage ejection of castings, which, in order to prevent breakage of different-height models when ejecting, one of the pusher plates is connected to the base plate through elastic elements and equipped with a travel stop, and the other is connected with drive 2.

However, a known mold limits the range of products, for example, products with holes parallel or at an angle to the plane of the connector, because when the mold is opened, the elastic force of the rubber elastic elements can be immediately transferred to the push plates to eject the castings, which will deform them. rods that receive movement from automatic mechanisms associated with the course of opening the mold will not be withdrawn from the casting.

The purpose of the invention is to increase the reliability of the mold during operation and to expand the range of products obtained.

This is achieved by performing a two-step pushing mechanism for casting in the form of 20 two pairs of pusher plates that receive movement from the drive movement pins at the end of the stroke to open the mold, while in one pair of pusher plates the stop is fixed, acting through the shackle with a roller hinged on the rack , on another pair of plates pushers.

In order to skew the push system, a pair of pusher plates is provided with a movement limiter, and the stop and the shackle are set in pairs evenly in the diametrically opposite direction.

The drawing shows the proposed mold, the cut.

The mold contains a movable plate 1 with a sprue bushing 2 and inclined fingers 3 and a stationary half-form consisting of a plate 4 with sockets for the gating ring 5 and models 6, a slider 7 of the side rod and a stop 8, a stand 9 with an advance mechanism containing an earring 10, a roller 11, an axis 12, a base 13, and a support plate 14 with fixed rods 15 and 16 and openings for pushing rods 17. Inside there are two pairs of pushing plates 18 and 19 with pushing bushings 20 and 21 fixed in them, pushing . 22, counter-tappers 23 and 24 and. erezheni.

The mold works as follows.

After the model mass is pressed in and the gate ring 5 and model 6 are cured, the mold is opened. The movable plate 1 moves away, drying out with its inclined fingers the 3rd terminal of the side rod with the slider 7 from the model 6. Then using the pushing bar 17 of the model machine, the joint movement of the pushing plates 18 and 19 is started to remove the model link (runner ring 5 with models 6) from the rods 15 and 16 and pushing the models out of the sockets of the plate 4. At the same time, the movement to the pushing plate 18 is transmitted through the roller i 1 by the abutment 25 which rests on it.

The shank 10 with the roller. 11 rotates around the axis 12 (see position A, shown conventionally). Passing path B, which is necessary to remove from the rod 16 and push the models out of the nests of plate 4, plate 18 stops (yriop into limiter 8 is possible), since at this time stop 25 goes out of contact with roller 11, passes by it, not delaying the movement of the pushing plate 19 to the value B. The uniform ejection of the gating is ensured.

rings and models from the sockets and removal from the rods and guaranteed retraction (repulsion) of the model element from the most projecting pushers 22 by the value of T, i.e. G vb.

When the mold is closed, the pushing plates 18 and 19 are returned to their original position by means of the counter pushers 23 and 24 due to their interaction with the plane of the connector of the movable plate.

The use of the proposed mold 1 for the manufacture of melted models ensures the expansion of the range of castings obtained by casting by melted models; simplicity of design and reliability in the operation of the mechanism of two-stage ejection of castings; obtaining complex castings with internal holes and external undercutting surfaces.

Claims (2)

1. A mold from the manufacture of smelted models, containing movable and stationary half-molds, a base plate and a two-stage mechanism for ejecting castings, consisting of two groups of pushers mounted on plates, characterized in that, in order to increase reliability in operation and expanding the product range in one of the pairs of pushing plates additionally reinforced emphasis, acting through the earring with a roller, hinged on the side of the rack, on the other pair of plates pushers. 2. A press mold according to claim 1, characterized in that, in order to reduce the skewing of the pushing system, a pair of pusher plates is provided with a movement limiter, and the stop and the shackle are installed in pairs uniformly in the diametrically opposite direction. Information sources. taken into account in the examination 1. Casting on melted models. Engineering monograph edited by Ya. I. Shklennik, Mashinostroenie, 1971, p. 105 2. USSR author's certificate No. 526437, cl. B 22 C 7/02, 1974.