SU1310105A1 - Injection mould - Google Patents

Abstract

The invention relates to foundry, in particular, to injection molds for casting with separation of the casting from the gating system. The purpose of the invention is to improve the quality of castings. The goal is achieved by performing the drive of the knife 7 in the form of a wedge mechanism, providing rigid synchronization of the movement of the rod 12 of the pressing piston and the knife 7 in the process of pressing in the metal. The mold contains a fixed half-form 1 with a pressing chamber 2 and a movable Form 3 with an ejection plate 4, pushers 5, 17, 18, an emphasis 14 and a cavity 8. The knife 7 is spring-loaded and installed coaxially with the feeder 6. In the process of pressing in after filling The metal casting cavity of the knife 7 is moved upwards with the help of two wedges, one of which 10 through an adjustable rod 11 is rigidly connected to the rod 12, and the other is fixed to the knife 7. The knife 7 moves the metal from the feeder 6 to the casting. The metal from the pressing chamber is moved through the hole 9 in the knife 7 into the cavity 8, which ensures the further movement of the knife 7 upwards and the separation of the casting from the press residue. The final position of the knife 7 is fixed by the stopper 16 on the stop 14. When the mold is opened, the pushers 5 and 18 push the casting and press residue, and the pusher 17 removes the stopper 16 from the stop 14. The knife 7 returns to its original position under the action of the spring 15. 1 3.p. f-ly, 3 ill. (L ate

Description

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The invention from)) of osit to the production of titanium, in particular for injection molding.

The purpose of the invention is to improve the quality of the cast.

Pa figure 1 shows a diagram of the mold at the time of pressing; Fig. 2 is the same at the time of movement of the knife for trimming med1P1Kov; Fig. 3 is the same at the time of opening the mold and ejecting the casting and the press residue.

The mold contains a fixed half-form 1 with a pressing chamber 2, a movable half-form 3 with an ejection plate 4, pushers 5, a feeder 6 and a knife 7 for trimming the press residue from the casting placed coaxially with the feeder channel with the possibility of return} 1o-progressive movement in it. In the movable mold 3, there is a cavity 8 located against the pressing and in the knife 7 —a hole 9. The knife drive 7 is made in the form of a wedge mechanism, the wedge 10 of which is rigidly connected to

12 pressing piston and another wedge

13 is connected to the knife 7. The movable half-form 3 is provided with an emphasis 14. The knife 7 is spring-loaded with a spring 15. The wedge 13 is equipped with a stopper 16 installed with the possibility of interaction with the stop

14 and one of the pushers 17. To the cavity 8 summed up the pusher 18.

The mold works as follows.

When the mold is closed (Fig. 1), before pressing the melt, the knife 7 does not obstruct the feeder 6, which allows the metal to freely fill the casting cavity, while cavity 8 has no communication with the pressing chamber 2, since it is blocked by the knife 7. When Pressing simultaneously with the rod 12 moves the rod 11 with the wedge 10. After: iL-i6opa gap S, the wedge 10 interacts with the wedge 13 and the knife 7 moves upward, blocking the feeder 6.

At the time of the extrusion completion (Fig. 2), the knife 7 overlaps the feeder 6 and moves the metal from the feeder 6 to the casting cavity, separating the latter from the press residue. At this time, the opening 9 in the knife 7 is aligned with the cavity 8, which is filled with metal coming from the pressing chamber 2. Move 1 metal out of chamber 2 irpec52

The movement into the cavity 8 provides further movement of the shaft 12 and the knife 7.

At the end of its stroke, the knife 7 is fixed by the stopper 16 on the stop 14 (Fig. 2), which excludes the possibility of the knife 7 being jammed at the time of the ejection of the casting and the press residue.

Adjustable along the length of the rod 1 1 provides a change in the beginning of the movement of the knife 7, i.e. change the size of the gap S.

After crystallization of the casting, the mold is opened (Fig. 3),

At this point, the cast without the press residue is moved together with the movable half-form 3. A hydraulic pusher of a maschine (not shown) rigidly fastened to the ejection plate 4,

moves the last to the right. In this case, the pushers 5 carry out the ejection of the casting, and the pusher 18 - the press residue.

At the end of the stroke of the ejection plate 4, the pusher 17 interacts with the stopper 16, depresses it, and the knife 7 returns to its original position under the action of the spring 15.

Then the cycle repeats. The use of a wedge mechanism for driving the knife allows the movement of the knife to be strictly synchronized and

pressing pressure, which leads to an increase in the quality of castings due to the absence of a lag of knife movement and to a guaranteed separation of the casting from the press residue.

Claims (2)

1. A mold for injection molding, comprising a fixed mold with a pressing chamber and a pressing piston and a movable mold with hooks and a knife for trimming sprues placed coaxially to the feed channel of the gate system with reciprocating movement in it from the drive, differing from By the fact that, in order to improve the quality of the castings, a cavity is located in the movable half-form opposite the pressing chamber, a hole is made in the knife, and the knife drive is made in the form of a wedge mechanism, one wedge Secondly through the region the rod to be fixed along the length is rigid 313101054 connected to the piston pressing rod; the half-mold is provided with an abutment, the knife is taken out, and the other is loaded with a spring, and its wedge fitted with a stopper installed with 2. A mold according to claim 1, about tl and - the possibility of interacting with an emphasis that is movable by one of the pushers. 4J7 Compiled by A. Mandrik. Editor N. Kishtulinets Tehred A. Kravchuk Proofreader G. Reshetenik Order 1824/9 Circulation 741 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4