CN102159343A

CN102159343A - Device for carrying mold cores

Info

Publication number: CN102159343A
Application number: CN2009801280859A
Authority: CN
Inventors: D·蒂曼; G·希勒
Original assignee: Emil Mueller GmbH
Current assignee: Emil Mueller GmbH
Priority date: 2008-07-17
Filing date: 2009-07-01
Publication date: 2011-08-17
Anticipated expiration: 2029-07-01
Also published as: BRPI0915999A2; RU2011105722A; CN102159343B; WO2010006925A1; PL2313219T3; RU2502580C2; MX2011000504A; EP2313219B1; EP2313219A1; DE102008040507A1

Abstract

In metallic components used in mechanical engineering design, particularly in motors, pumps, compressors or power plant systems, and which are manufactured using known casting and injection molding methods, it is frequently required that cavities be provided in cast or injection molded parts, for example channels for cooling media or lubricants. Furthermore, the shaping of a cast or injection molded part by undercutting can be hindered. In both cases, soluble mold cores are particularly suitable as placeholders of such cavities. As a device for self-supporting placement of a core in the mold of a casting device, said core able to be dissolved by a liquid solvent, the invention proposes that the device is a supporting tube (3), that the at least one supporting tube (3) has a reduced cylindrical part (5) and that this part (5) inserts into the mold core (1) and holds the mold core.

Description

Be used to support the device of core rod

The present invention relates to be used for can be by the device of the core rod of liquid flux dissolving single-ended the fixedly installing of the mold of casting equipment.

In that in machine-building, in motor, pump, compressor or power station plant, use especially and the metal parts with known casting and the manufacturing of spray to cast method, often need in casting or spray to cast part, cavity be set, for example be used for the passage of cooling medium or lubricant.In addition, casting or spray to cast part are shaped and may be hindered by slotting.In both cases, so-called disengaging core rod is particularly suitable for as the occupying device of respective cavities, and it is a kind of soluble core rod, by the liquid flux solubilized.Because this core rod since its in cast parts or spray to cast part the position and can not touch from the outside, so it develops from set cavity by the perforate that provides on cast parts or spray to cast part for this reason.Preferred especially this core rod is with water-soluble sand that flocks together or salt manufacturing.Such core rod also can use when the spray to cast plastic part.

The difficult point of the cooling duct in for example known piston that is formed in internal combustion engine.The there must not have the ground of support to the core rod that is provided with for the shaping annular cooling channel and keeps in a cavity, this cavity is full of with solution fully.

A solution to this proposes in DE 10131725 B4.This core rod keeps in position given in advance on the casting mould core at casting equipment under the power effect, and this power effect here produces by vacuum or magnetic.Fixedly the time, must in core material, mix the material that can be magnetized by magnetic.But this material must be removed to noresidue, and does not allow to react with cast material.

Must guarantee by the vacuum sucking-off time can not sucking-off solution.Know a kind ofly to be used to shaping cooling duct in piston and the fixing device of salt core rod from DE 4238851 A1, wherein the salt core rod is fixed on the half movable mold of crystallizer by keeping bar, and described maintenance bar self is stuck on the ram.This solution structure expense is big.

Task of the present invention be to provide a kind of simple in structure, be used for the single-ended mechanical device that fixedly installs core rod that can be by the liquid flux dissolving in the mold of casting equipment.

This task solves by the feature of the characteristic of first claim.Favourable remodeling of the present invention provides in the dependent claims.

Be used for the single-ended device that fixedly installs core rod that can be by liquid flux dissolving in the mold of casting equipment as of the present invention, the special holding tube that for this reason is shaped is arranged.One end of this holding tube inserts core rod, and the other end inserts for example another core rod of another part that crystallizer wall or insertion water mold.Keep this core rod by one or more holding tube then.According to the present invention, the terminal little cross section that the end of holding tube in inserting core rod inserts in having than the other parts of watering mold.Form is that this device of holding tube has such advantage, promptly is particularly useful for having the core rod of little cross section.Such core rod for example is annular core rod, and it for example is used at piston particularly in the shaping of the cooling duct of the piston of internal combustion engine.

The size of holding tube of the present invention is decided on the size of the core rod that it will support.This holding tube can have 10mm to the total length between the 30mm, wherein the length of taper portion at 3mm between the 7mm.The maximum gauge of holding tube can be decided on the inlet tube that leads to cavity set in cast parts and the diameter of discharge pipe, at 3mm between the 20mm.The column part that attenuates of holding tube has 2mm to the diameter between the 5mm.Wall thickness at 0.1mm between the 0.6mm.In the column part that it attenuates, holding tube can have a longitudinal cut or two relative longitudinal cuts, and these longitudinal cuts are complementary on length and diameter, can have 1.5mm to the length between the 4mm and 1mm to the width between the 1.5mm.

The material of holding tube is decided on the material of solution, and it should not react with it as far as possible and causes influence to keep function.The material of holding tube for example can be the V2A steel.

Holding tube is inserted on another pipe usually, perhaps inserts in the perforate of a part of mold.Usually this pipe or perforate provide the path that passes to core rod, make behind casting or spray to cast, when workpiece hardens, by this pipe or perforate the maintenance pipe bit are opened, so that produce the path that passes to core rod.Supply with the liquid of dissolving core rod then by this perforate, and lysed core rod is developed.

Negative pressure can be on holding tube, applied, the exhaust of core rod can be during casting and spray to cast process, supported thus.By the otch in the column part that attenuates of holding tube, the area of the perforate of holding tube is exaggerated, and supports exhaust thus.This negative pressure is consistent with the core rod composition.Under the situation of salt core rod, this negative pressure for example is 0.2 crust.

Describe the present invention in detail according to an embodiment.Each accompanying drawing is all drawn with the ratio of amplifying, wherein,

Fig. 1 represents the side view of the view that has its cross section of the salt core rod that is used for annular cooling channel of a band holding tube,

Fig. 2 represent with the vertical view of the prolongation running-on of the salt core rod of holding tube and

Fig. 3 represents the side view of holding tube, and its part is broken away.

Present embodiment represents to be used for the single-ended device that the salt core rod of annular is set regularly, and it for example is used in the particularly shaping of the cooling duct of the piston of internal combustion engine of piston.

Because the import of cooling duct and outlet converge at its downside usually, so annular core rod is supported on its downside.On these core rods, can form the prolongation running-on of alms bowl shape, insert holding tube in it.These prolongation running-ons indicate the import and the outlet of cooling duct simultaneously.Because the piston wall thickness, these prolongation running-ons do not allow significantly to exceed the cross section of cooling duct.On the other hand, the wall thickness of prolongation running-on must be even as big as providing the support that needs to holding tube, and wall can not peel off when injecting especially.Particularly hard core rod is perishable.

By its shape that attenuates, holding tube has such advantage, and promptly the prolongation running-on of core rod can significantly exceed its cross section scarcely, and however still keeps enough wall thickness, so that provide the support that needs to holding tube, can support and keep core rod thus.This is favourable under the situation of salt core rod especially.The external diameter of 75mm for example can be arranged annular cooling channel in the piston and 9mm is high and the wide non-circular cross-section of 4mm.

Fig. 1 represents that an annular core rod 1 that is used for the cooling duct of piston is the view that has cross section 2 of salt core rod in this example, and this core rod has the holding tube 3 of an insertion.The prolongation running-on 4 of an alms bowl shape is passed in this cross section in the centre, insert the column part that attenuates 5 of holding tube 3 and keep core rod 1 in the prolongation running-on.The entrance and exit of circular passage in the prolongation running-on 4 sign pistons of core rod 1, and be the position of cavity of removing being used to of utilizing holding tube 3 to get out will to form the circular passage of core rod 1.It stretches out several millimeters at the downside of core rod 3.

The undeformed part 6 that column part 5 holding tube 3 and that attenuate is connected can be inserted in the wall or another core rod of another pipe or a crystallizer with one end (not shown).The otch 7 that the column part that attenuates 5 of holding tube 3 has two lengthwises and extends in parallel.They may produce the cross-sectional area that amplifies tap 8 under the situation of exhaust at core rod 1.

Fig. 2 represents to have the vertical view of prolongation running-on 4 of the holding tube 3 of insertion.Find out that obviously because the cross section that reduces of the column part that attenuates 5 of holding tube 3, prolongation running-on 4 does not significantly exceed the excircle of core rod 1, thereby can not weaken the intensity of the wall of piston in its zone, cooling duct.

The side view that Fig. 3 cuts open with part illustrates the example of holding tube 3 of the present invention.Its total length 9 is 18mm, and the length of taper portion 10 is 6mm, and the length 11 of wherein inserting the column part that attenuates 5 in the core rod is 4mm.The long tapered segment 12 of 2mm is arranged therebetween.The parallel otch 7 of two 2.5mm long 13 and 1.5mm wide 14 is set on the column part 5 that attenuates.The diameter 15 of the undeformed part 6 of holding tube 3 is 4mm, and the diameter 16 of the column part 5 that attenuates is 3mm.Wall thickness 17 is 0.6mm.The material of holding tube 3 is V2A steel.

Claims

1. one kind is used at the single-ended device that core rod that can be by the liquid flux dissolving is set regularly of the mold of casting equipment, it is characterized in that, this device is a holding tube 3 at least, this holding tube 3 has a column part that attenuates 5, and this column part that attenuates 5 inserts in the core rod 1 that will keep and keeps this core rod.

2. device according to claim 1 is characterized in that, the column part that attenuates 5 of holding tube 3 and the consistent size of core rod.

3. device according to claim 1 and 2 is characterized in that, holding tube 3 is inserted in the prolongation running-on 4 of the core rod 1 that will keep.

4. according to the described device of one of claim 1 to 3, it is characterized in that holding tube 3 sign passes to and remains the path of the cavity that forms by core rod 1.

5. according to the described device of one of claim 1 to 4, it is characterized in that holding tube 3 indicates perforate, go out dissolved core rod via this opening is flushable.

6. according to the described device of one of claim 1 to 5, it is characterized in that holding tube 3 is in the downside setting of core rod 1.

7. according to the described device of one of claim 1 to 6, it is characterized in that the column part that attenuates 5 of holding tube 3 has at least one otch.

8. device according to claim 7 is characterized in that, the column part that attenuates 5 of holding tube 3 has the otch 7 of two parallel vertical settings.

9. according to the described device of one of claim 1 to 8, it is characterized in that, holding tube 3 has at 10mm to the total length between the 30mm 9, the length of taper portion 10 at 3mm between the 7mm, not the diameter 15 of crushed element 6 at 3mm between the 20mm, the diameter 16 of the column part 5 that attenuates at 2mm between the 5mm, wall thickness at 0.1mm between the 0.6mm.

10. according to the described device of one of claim 7 to 9, it is characterized in that, at least one otch 7 in the column part that attenuates 5 of holding tube 3 have 1.5mm to the length between the 4mm and 0.5mm to the width between the 1.5mm.

11., it is characterized in that holding tube 3 can be inserted in the annular core rod 1 according to the described device of one of claim 1 to 10.

12., it is characterized in that holding tube 3 can be inserted in the salt core rod 1 according to the described device of one of claim 1 to 11.