CN1037329C

CN1037329C - Casting method of wearing composite material

Info

Publication number: CN1037329C
Application number: CN92104706A
Authority: CN
Inventors: 唐靖林
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-06-19
Filing date: 1992-06-19
Publication date: 1998-02-11
Anticipated expiration: 2007-06-19
Also published as: CN1080221A

Abstract

The present invention relates to a method for compounding strengthening and wearing materials on the surface of castings, which belongs to the technical field of casting. By using the means of filling a solid gasified mould to the mould cavity of a casting mould made by a vacuum sealed forming technology, a negative dimension allowance is reserved in a position on the surface of the solid gasified mould, the solid gasified mould is put in the mould cavity of the casting mould, then, composite dried alloy powder is put into a 'gap cavity ' formed between the solid gasified mould and the inner wall of the mould cavity, the 'gap cavity' is filled compactly and sealed, and the mould is closed, pumped into vacuum and poured. The method can be used for compounding alloy layers on the surface of the castings with different shapes and guarantees the quality of the alloy layers of the castings; the thickness of the alloy layers can be regulated, and thus, the alloy layers have strong adaptability.

Description

A kind of casting method at the metal surface composite abrasion resistance material

The present invention relates to a kind of casting method at the metal surface composite abrasion resistance material, it belongs to casting technology field.

In the abrasive wear occasion, frayed the requirement to its material should have high wearability usually, possesses good toughness again, and the part that simple a kind of material is made is difficult to satisfy above conflicting requirement.So the various surface strengthening technologies in combination-wearing coat, toughness material surface are showing very big superiority aspect the above-mentioned contradiction of solution.Wherein, when producing foundry goods, disposable finishing in the technology of cast(ing) surface composite wear-resisting alloy layer compared with surface intensified techniques such as traditional built-up welding spraying and laser surface alloyings in casting solidification process, it is big to have alloy layer thickness, increases service life, can heat treatment and alloy-layer and metallic matrix be outside the advantage such as metallurgical binding, main is to need not special equipment, simplified production process, thereby shortened the production cycle, the aspect that reduces production costs has significant using value.

When producing foundry goods, make that the method for cast(ing) surface composite wear-resisting alloy layer is modal to be: apply casting and by applying combine together casting technique of casting and vacuum sealed molding; Above-mentioned casting technique and method are all used aborning, and use till today always.But there is following technical defective in they as the technology at cast(ing) surface composite wear-resisting alloy layer: (1) alloy layer thickness is thinner, influenced foundry goods service life, and machine-finish allowance is little, has influenced its application; (2) owing to exist organic or additives such as inorganic binder, easily produce defectives such as slag inclusion, pore in the alloy-layer, composite alloy layer quality is affected; (3) on casting mold die cavity inwall, be laminated with pure dry state alloyed powder,, be only limited to the die cavity wall of level of approximation, especially be laminated with the alloyed powder difficulty, thereby limited applying of this method in the die cavity side though have many good qualities.

The object of the present invention is to provide a kind of casting method of reinforced wear-resistant composite, this method can be laminated with alloy powder particle on die cavity diverse location surface simultaneously, so that cast(ing) surface composite alloy layer, and alloy layer thickness can regulate within the specific limits, and overcome the deficiency of above-mentioned prior art.

In order to realize purpose of the present invention, design of the present invention is such: the prefabricated full mold gasified pattern of elder generation, and make full mold gasified pattern surface need the position of composite abrasion resistance material artificial be reserved with negative size surplus, then above-mentioned gasified pattern is inserted in the casting mold die cavity, gasified pattern and die cavity inwall form a thickness " interstitial cavities " uniformly, again alloyed powder is put in above-mentioned " interstitial cavities ", after the mould assembling, adopt the cast of vacuum sealed molding method, because high temperature, molten metal at first makes the gasified pattern gasification, gas is taken away by vacuum thereupon, and then, molten metal replaces the gasified pattern position, be full of die cavity, under negative pressure of vacuum and capillarity, penetrate in the alloy powder particle, alloy powder particle is under the hot physics and chemical action of high-temperature metal, behind casting solidification, just form a wear-resistant alloy layer on its surface.

In order to be laminated with the convenience of alloyed powder granulosa, above-mentioned full mold gasified pattern can be designed to removable combination die, to satisfy the requirement that different surfaces is laminated with alloy powder particle.

The composite alloy layer thickness is by the artificial negative size surplus of reserving on the gasified pattern or by the thickness decision of full mold gasified pattern and die cavity inwall formed " interstitial cavities ", the material of full mold gasified pattern is the polystyrene foam plastics of using always in the cavityless casting.

The obtained technological progress of method of the present invention is: it uses reinforced alloys powder (as diamondite powder commonly used) successfully compound thicker wear-resistant alloy layer on the foundry goods matrix, maximum ga(u)ge can reach about 10mm, because the dried alloyed powder that uses does not contain other organic or inorganic additives, thereby composite alloy layer tissue densification, pore, dreg defect seldom, and composite alloy layer and mother metal matrix are metallurgical binding.In addition, use this method to operate easily successfully at irregular casting material surface recombination one deck antifriction alloy powder, casting cost is relatively low.

The following examples can further specify the present invention.

Embodiment:

Mechanical seal ring is the fluid machinery revolution shaft seal that uses in the engineerings such as oil, chemical industry, mine, it seals by end face, as shown in Figure 1, thereby the seal face of sealing ring should have high-wearing feature, ring seat is when having certain wearability, also certain toughness will be arranged, but ring seat only requires that have certain wearability in the overcurrent side just passable.

The used concrete grammar of present embodiment is: at the end face and the overcurrent side composite wear-resisting alloy layer of the ring seat of being made by common material, the alloy powder is selected cast tungsten carbide (WC+W for use ₂C) be main key phase, operating procedure is described below in conjunction with accompanying drawing.

Fig. 1 is the cutaway view of embodiment mechanical seal ring.

Fig. 2 is the profile of full mold gasified pattern 3.

Fig. 3, Fig. 4, Fig. 5, Fig. 6 are the profiles of embodiment operating process sandbox.

Fig. 7 is the profile of mechanical seal ring finished product.

Description of drawings:

1, wearing face, 2, seal ring seat, 3, the full mold gasified pattern, 4, vacuum sealed molding sandbox, 5, vacuum orifice, 6, vacuum chamber, 7, ventilation net, 8, die cavity, 9, sealing film, 10, dry state molding sand, 11, interstitial cavities, 12, alloyed powder, 13, the sprue gate, 14, alloy-layer, 15, base metals.

The present embodiment operating procedure is as follows:

1, full mold gasified pattern processed

As shown in Figure 2, gasified pattern 3 usefulness foamed polystyrene foamed plastics are made Fig. 2 In dotted portion represent foundry goods actual size, i.e. cavity dimension.

2, manufacture the vacuum seal casting mold

As shown in Figure 3, in vacuum sealed molding sandbox 4, insert dry state molding sand 10,, after vacuumizing, do forming cavity 8 with sealing film 9 sealings.

3, as shown in Figure 4, the full mold gasified pattern is put into the casting mold die cavity, owing to be reserved with certain negative size surplus than foundry goods when carrying out gasified pattern and manufacturing, so full mold vaporization membrane and die cavity inwall form an interstitial cavities 11 naturally, so, tamp this interstitial cavities with the diamondite powder.

4, sealing

As shown in Figure 5, sealing film 9 is covered on casting mold die cavity 8, and seal it off, 5 places vacuumize at vacuum orifice, under the negative pressure of vacuum effect, do the attitude alloyed powder granulosa that looses by consolidation.

5, mould assembling cast

As shown in Figure 6, produce second half casting mold with the vacuum sealed molding method, mould assembling is burnt and is annotated, 13 pour into molten metal from the sprue gate, vacuumize at vacuum orifice 5 places simultaneously, high-temperature liquid metal at first makes gasified pattern 3 gasifications, gas is taken away by vacuum thereupon, molten metal replaces the position of gasified pattern 3 and is full of die cavity 8, penetrate in the alloy powder particle under the effect of negative pressure of vacuum, alloy powder particle is under the hot physics and chemical action of high-temperature metal, behind the casting solidification, form a wear-resisting diamondite layer 14 on its surface, as shown in Figure 7.

Claims

1, a kind of casting method at the metal surface composite abrasion resistance material, feature is: the prefabricated full mold gasified pattern of elder generation, and make full mold gasified pattern surface need the position of composite abrasion resistance material artificial be reserved with negative size surplus, then the full mold gasified pattern is inserted in the casting mold die cavity, again the composite alloy powder is put into the interstitial cavities that full mold gasified pattern and die cavity inwall form, vacuumize after the sealing, the mould assembling cast, high-temperature liquid metal makes the gasified pattern gasification, after gas is taken away, molten metal replaces the gasified pattern position, is full of die cavity, under negative pressure of vacuum and capillarity, penetrate in the alloy powder particle, alloy powder particle behind casting solidification, just forms a wear-resistant alloy layer on its surface under the hot physics and chemical action of high-temperature metal.

2, method according to claim 1 is characterized in that said full mold gasified pattern is removable combination die.

3, method according to claim 1 and 2 is characterized in that the material selection polystyrene foam plastics of said full mold gasified pattern.