CN1095652A

CN1095652A - Venting valve arrangement for diecasting moulds

Info

Publication number: CN1095652A
Application number: CN 93106083
Authority: CN
Inventors: F·霍德勒
Original assignee: Fondarex F Holder & Cie SA
Current assignee: Fondarex F Holder & Cie SA; Fondarex F Hodler and Cie SA
Priority date: 1993-05-21
Filing date: 1993-05-21
Publication date: 1994-11-30

Abstract

The breather valve assembly that is used for compression mod, it comprises: a block, one places the conduit in the block, at least one valve piston that is configured in this block part, air in the block conduit is discharged, at least one driven plunger that is configured in this block part and communicates with this block conduit, a connection piece is connected between each valve piston and each driven plunger, so that each valve piston is moved along with driven plunger, thereby in use, fluid pressure in the block conduit can be used to operate driven plunger, drives valve piston again, and valve piston is closed the block conduit from exhaust condition.

Description

Venting valve arrangement for diecasting moulds

The relevant a kind of breather valve assembly that is applicable to mold of the present invention.

This kind breather valve assembly has been exposed in No. 306274 patent specification of Switzerland.In this specification structure openly, the utensil that is in transmission connection between driven plunger and the valve piston has a rocking bar, and these pistons all are connected on this rocking bar.When driven plunger moves, rocking bar can rotate, and then makes valve piston move a corresponding distance, thereby according to the rotational orientation of rocking bar, can cause valve piston closed or open.

Yet known valve assembly can only be used for less valve, and this little valve only is applicable in the little die cavity of casting light casting.Even in this case, the also necessary precision very of endplay device, result cause the manufacturing of valve assembly very complicated, that is to say, can't avoid functional fault fully.Because two pistons all have the guided cylinder of regular length, how many significant deflections that rocking bar departs from the position that becomes vertical with cylinder axis can produce stress on the guided cylinder of piston.For fear of this shortcoming, must be provided with special device on the pivoting point that these pistons and rocking bar join, the space dwindles between the piston pivoting point that causes with the angle variation of compensation rocking bar.Above-mentioned angle system is projected in the angle on the plane that becomes vertical with piston axis.

The invention provides a kind of can the use so that get rid of the breather valve assembly of the air of die cavity with mold, this assembly comprises: a block, one places the conduit (or being called the block conduit) in the block, this block conduit is used for forming the extension of the airway of this mold, at least one is configured in the valve piston in this block, so that with the block conduit, thereby the air in the airway is discharged in use, at least one is configured in this block and the driven plunger that communicates with this block conduit, fluid pressure to the anticaustic force generating apparatus of opposing in it is reacted, should or the axis of each valve piston and this or each driven plunger come down to parallel, a connection piece be connected this or each valve piston and should or each driven plunger between, so that make this or each valve piston become each driven plunger and move along with this, thereby in use, the fluid pressure that produces in the block conduit can be operated this or each driven plunger, drive again and be somebody's turn to do or each valve piston, and valve piston is closed the block conduit from exhaust condition.

In a preferred embodiment, the transmission between driven plunger and the valve piston is to be produced by a dish-shaped member, and this dish member is stuck in the gap between two composition surfaces of valve piston.This gap can be a groove, and this groove is occupied by the plate with end-play.Should or each driven plunger and connector between this or each valve piston be designed under part does not need the situation of high-precision design and manufacturing, can not guarantee correct action.Again, if the pattern of connector make two-piston or be fixed in the work that all has end-play on the part that is bonded with each other member or member coefficient on these two pistons with it, just can not cause fault because of the thermal expansion of the member that is bonded with each other.

Yet, if heat is held cylinder expansion than it and is got for a long time to such an extent as to piston becomes, individual may being stuck in because of the appearance of thermal stress in its cylinder one of in these pistons.In order to eliminate this kind danger, in the breather valve assembly of preferred embodiment of the present invention, be provided with several driven plunger, these pistons become to be arranged in parallel and with a dish-shaped member start (as previously mentioned) each other, this dish member is prominent to these valve pistons, should contact with two adjacent surfaces of at least one valve piston by the dish member simultaneously.In order to reach identical purpose, can not have only a valve piston and be provided with a plurality of valve pistons that have driven member such as driven dish, this driven member is driven the piston start or is connected with it, and this driven plunger then is connected with all valve piston in a kind of mode of transmission of power.According to the number of driven plunger and/or valve piston quantity, their diameter can be littler than the diameter of single driven plunger and/or valve piston, all has identical outstanding function to guarantee each, same a large amount of gas can be extracted out from mold simultaneously.Adopt these small bore pistons, its piston play can be littler than the play of big piston diameter, and at high temperature also can not press from both sides phenomenon dead or that block; The metal fluid of high fluidity makes the inoperable dangerous facts of valve just can not take place being pressed under the high pressure effect between piston and the cylinder wall.A plurality of driven plunger are provided and under the situation that needs are arranged, provide the plurality of valves piston to have extra advantage; That is, because they can move freely in cylinder, therefore make them get back to the required power of starting point and just can reduce.So as long as the less spring of elastic force, in large diameter driven plunger, just can exempt simultaneously through the pin that is commonly used to discharge high pressure.

In addition, for clamping or the choking phenomenon that overcomes piston, to be decided to be 1/4 of sealing head end place piston diameter also be favourable like the degree of depth that sinks to of the driven plunger of plunger and/or valve piston with shape.Degree of sinking to herein be the outer surface of piston crown can shift-in in the cylinder wall and with its cylinder axial length that seals up.

Because one to sink to the degree of depth quite dark for this, so founding materials can contact with same large-area cylinder wall and piston head, founding materials will be passed to the as many heat of piston at least and pass to cylinder as a result.The result is because the expansion of the cylinder diameter that the temperature rising causes is next for a short time unlike the expansion of piston diameter, and the initial play between piston and the cylinder still can be maintained like this.Therefore, give valve piston, just can make it get back to the release position as long as add very little restoring force.

The present invention will further specify as follows in conjunction with the accompanying drawings.

Description of drawings:

Fig. 1 is the vertical cross section of the present invention's valve arrangement, and wherein valve piston ties up to the release position;

Fig. 2 system and the similar valve arrangement profile of Fig. 1, but valve piston is in closing position;

Fig. 3 is the view along one of two blocks of the valve arrangement that III among Fig. 1-the III line is obtained;

Fig. 4 system is along the front view of another blocks of two blocks of the valve arrangement that IV among Fig. 1-the IV line is obtained; And

Fig. 5 is the axial amplification profile of valve piston and cylinder thereof.

In the shown embodiment of these figure, breather valve is made up of a blocks, and this blocks comprises two

block

1 and 2, and these two block link together with bolt 3.Blocks can be locked on the half module 5 of mold with set bolt 4, is supportting another half module 6 of this mold with its outside (as shown in Figure 4).

In this embodiment, the shown half module 5 in Fig. 1 and Fig. 2 right side has an airway 7, and this airway 7 has an extension 8 in the block part 1 of valve arrangement.This extension 8 the cylinder of end with 9,5 driven plunger 10 in an expansion section then open in this expansion section, as shown in Figure 4.These driven plunger 10 shapes are like plunger, and at an end that reaches away from expansion section 9, all have a shoulder 11, and 11 of these shoulders are in cylindrical space 12, and these shoulders are a kind of stopper section that is used for defining the original position of driven plunger 10.One drive piston 13 can slide in cylindrical space vertically, and at its head end place away from driven plunger, drive piston 13 has a driven dish 14, and this driven dish 14 can rotate around the axis of piston.For this purpose, it rotatably is seated on the piston rod 15, and this piston rod 15 is disposed at the opposite side of drive piston 13, that is away from a side of driven plunger 10, and this piston rod 15 is guided in the hole 16 of block 2.Piston rod 15 by compression spring 17 around, this spring 17 makes drive piston 13 press to the left side of piston chamber 29 by driven dish 14, as shown in Figure 1, all in the figure driven plunger all are in original position.

Two vent piston 20 axially movably are contained in the cylinder 19, and these cylinders 19 are parallel to the axis of driven plunger.All there is an annular recess 18 centre of each vent piston 20, and this ring dress groove 18 can form with the method for turning or with two axle collars 21.Outlet 22 communicates with the cylinder 19 of accommodating valve piston 20.When valve piston 20 during in open position (as shown in Figure 1), outlet 22 is by cylinder 19, manifold 23(as shown in Figure 4) be communicated with extension 8 limits of airway 7.These manifolds 23 were vertical with 8 one-tenth of extensions before this, and then spread out.Final divergent 23a links to each other with chamber 24, and this chamber 24 is communicated with the cylinder 19 of one of valve piston 20.

After die cavity (end show) fills up and before motlten metal arrived conduit extensions 8 via airway 7, compression spring 17 passed through driven dish 14 and drive piston 13, driven plunger 10 is shifted onto on as shown in Figure 1 the original position.In case when this founding materials filled up the expansion section 9 of conduit extension 8 ends, this founding materials had the trend that flows to manifold 23.Because the section than conduit extension is little in fact for the combination section of these manifolds (they are derived from extension 8), the pressure of expansion section 9 can raise, thereby driven plunger 10 is being resisted the active force of spring, and is forced into end position, as shown in Figure 2.Meanwhile, driven plunger 10 drive piston 13 that can will have a driven dish 14 is pushed the right to; Driven dish 14 since with groove 18 positive engagement, valve piston 20 can be pushed into its closing position, as shown in Figure 2.So can make in the piston head 25 shift-in cylinders 19, thereby block being communicated with of chamber 24 and outlet 22.In this way, the outlet 22 of airway 7 is closed; The founding materials that once entered chamber 24 simultaneously via manifold 23 just can't penetrate outlet 22, nor can be from exporting 22 ejections.

Because the difference of manifold 23 is scattered (as shown in Figure 4), fill up expansion section 9 and driven plunger 10 moved on to before the end position shown in Fig. 2 (breather valve is a closure state among the figure) at metal flow, the metal splashings or the minute metallic jet flow that occur in before the closely knit metal flow can not arrive chamber 24.

Driven plunger 10 and valve piston 20 are all made shape like plunger.Valve piston 20 be designed to valve piston when the final position shown in Fig. 5 imaginary line, its the head outer surface 26 that contacts with founding materials can put in an axial distance T in the wall (it and these piston 20 tight fits) of cylinder 19, this apart from T need be at least piston head 25 diameter 1/4.Because this one stretches into degree of depth T, can absorb and piston head 25 heat of as much at least by head surface 26 at the contacted cylinder wall of founding materials of cylinder head end place and heat.The diameter that increases because of being heated of cylinder 19 equals to be directed at the diameter that piston head 25 is wherein increased because of heat absorption to I haven't seen you for ages as a result.This feature also is the same for the head of driven plunger 10.

Be the event of combination, driven dish 14 is configured in the chamber 29 of block 2, and the opening of this chamber 29 is towards block 1.There is a par 27 at the edge of this driven dish 14.Its size is made when driven dish and is forwarded to when making par 27 on the position shown in Fig. 3 dotted line, and driven dish 14 can break away from the cannelure 18 of valve piston 20.In this turned position, when

block

1 and 2 when separated from one another, driven dish 14 and drive piston 13 and piston rod 15 can shift out from block 2, form the protuberance 21 of grooves 18 by valve piston 20, and this moment, valve piston 20 remain in the block 2.On the contrary, can not hold driven dish 14, under the situation of drive piston 13 and piston rod 15, valve piston 20 can be pulled out in cylinder 19.

One logical from pressure source and the catheter pressure 28 that can begin Pretesting breather valve function at casting manipulations by this be communicated with cylindrical space 12 between the drive piston 13 between driven plunger 10.

Claims

1, a kind ofly be used for mold so that the breather valve assembly that the air in the die cavity is discharged, this assembly comprises: a block, one places the conduit (or being called the block conduit) in the block, this block conduit is used for forming the extension of the admittance pipe of this mold, at least one is configured in the valve piston in this block part, so that with the block conduit, thereby the air in the airway is discharged in use, at least one is configured in this block and the driven plunger that communicates with this block conduit, fluid pressure to opposing reaction force generation device in it is reacted, should or the axis of each valve piston and this or each driven plunger come down to parallel, a connection piece be connected this or each valve piston and should or each driven plunger between, so that make this or each valve piston along with this or every driven plunger and move, thereby in use, the fluid pressure that produces in the block conduit can be operated this or each driven plunger, drive again and be somebody's turn to do or each valve piston, and valve piston is closed the block conduit from exhaust condition.

2, breather valve assembly according to claim 1, it is characterized in that, wherein should or each valve piston comprise a member with connector between this or each driven plunger, this member is in occupation of the space between two adjacent surfaces of this or one of each valve piston and driven plunger.

3, as the breather valve assembly as described in the claim 2, it is characterized in that wherein this member is a dishful of member.

4, as the breather valve assembly as described in the claim 3, it is characterized in that wherein the space of being defined by two adjacent surfaces is a groove, this member occupies this groove of work, has end-play simultaneously.

As the breather valve assembly as described in the claim 2, it is characterized in that 5, wherein these adjacent surfaces belong to this or each valve piston.

6, as the breather valve assembly as described in the claim 2, it is characterized in that wherein these a plurality of driven plunger promote this member.

7, breather valve assembly as claimed in claim 1 or 2 is characterized in that, wherein a drive piston is configured between these driven plunger and this member, so as between them transferring power.

8, breather valve assembly according to claim 1 is characterized in that, wherein this reaction force generation device comprises a spring.

9, as the breather valve assembly as described in claim 3 or 5, it is characterized in that wherein this dish member can turn on the position that does not occupy this groove.

10, as the breather valve assembly as described in claim 3 or 4, it is characterized in that, wherein this dish member mainly be shaped as circle, but be removed one section arc surface so that make this plate not occupy this groove in this position.

11, as the breather valve assembly as described in claim 3 or 4, it is characterized in that wherein this block is two blocks, this dish member is configured in the chamber of a block wherein, thereby when each valve piston makes this block conduit when exhaust condition is closed, this dish member contacts with the pedestal of this chamber.