CN102125990A - Method for manufacturing normal pressure reinforced wax mould head - Google Patents

Abstract

The invention discloses a method for manufacturing a normal pressure reinforced wax mould head, which is characterized by comprising the steps of: 1, firstly manufacturing a discrete mould assembly; 2, pouring wax liquid at normal pressure and doping wax crumbs; and 3, cooling, taking away the discrete mould assembly to obtain the normal pressure reinforced wax mould head. Compared with the method for manufacturing the mould by adopting the discrete mould head assembly through splicing at normal pressure, the wave crumbs formed at high pressure are doped in the manufacture process, and have high density and strong adsorbability, the shrinkage depression degree of the wax liquid containing the wax crumbs is far less than that of the wax liquid without containing the wax crumbs, the strength of the wax mould is improved, and the wax crumbs ensure that the cooling speed of the mould head is increased and the production period is shortened.

Description

A kind of normal pressure strengthens the manufacture method of wax-pattern head

Technical field

The present invention relates to a kind of improvement of hot investment casting wax-pattern die head manufacture method, specifically a kind of manufacture method that adopts wax liquid, mixes a kind of normal pressure enhancing wax-pattern head of cast under broken wax bits, the normal pressure.Mainly be applicable to the casting technique of sample or foundry goods negligible amounts.

Background technology

Development along with society, the purposes of precision casting is extensive day by day, except that being applied to aviation, weapons department, almost be applied to all industrial departments, particularly electronics, oil, chemical industry, communications and transportation, light industry, weaving, pharmacy, medicine equipment, pump and valve member.Casting dimension accuracy height, the surface roughness value of producing by the precision-investment casting method is low, flexibility is high, adaptability is strong, special in the complex-shaped parts of foundry goods, the mould of this casting, owing to be the wax-pattern that the high pressure cast forms, so superiority is remarkable, long service life is particularly suitable for producing in enormous quantities.

But in process of production, often run into the operation of cast samples, the perhaps operation of foundry goods negligible amounts, only be cast samples or requirement foundry goods quantity seldom in, if adopt independent height to press off wax-pattern, then mould takes very highly, causes production cost very high.In this case, for cost saving, often do not adopt independent height to press off wax-pattern.But adopt discrete die head die assembly to be combined into mould, employing is watered the method for casting liquid and is made under normal pressure, be combined into mould but adopt, the existing deficiency of die head of watering the method making of casting liquid under the normal pressure is: because pressure is low, cause wax-pattern density low, so the phenomenon of shrinkage porosite and upper surface contraction appears in wax-pattern easily, the intensity of wax-pattern significantly reduces, to such an extent as to cause in follow-up foundry production, often occur because the wax-pattern insufficient strength, and the phenomenon of rupture of wax-pattern appears, not only caused the yield rate reduction, the casting cost increases, and serious also can incur loss through delay the duration, result in greater loss.

Summary of the invention

The object of the present invention is to provide a kind of normal pressure, discrete die head die assembly of can adopting to be combined into the making mould of wax-pattern, can reduce shrinkage porosite degree, the surface depression degree of wax-pattern inside again, and the manufacture method that technology is simple, a kind of normal pressure that implement easily, that can improve wax-pattern intensity strengthens the wax-pattern head.

For reaching above purpose, the technical solution adopted in the present invention is: this a kind of normal pressure strengthens the manufacture method of wax-pattern head, it is characterized in that being finished by following steps:

(1), at first make discrete die assembly: according to foundry goods shape, the size that will cast, produce discrete die assembly, and the die assembly that will disperse is combined into the Wax mold inner chamber, is placed on the metallic plate plane with aluminium alloy; Simultaneously, select the high pressing die head of the similar high pressure belt cast gate wax cup of the Wax mold cavity shape that is combined into to discrete die assembly for use, the high pressing die head of this high pressure belt cast gate wax cup can be used a variety of in production at ordinary times, therefrom select qualified getting final product, its size is greater than 1/4 of die head to be cast, be advisable less than 1/2 of die head to be cast, distance in the outer wall of high pressing die head and the Wax mold between the cavity wall is 2-15mm, the height of the high pressing die head of high pressure belt cast gate wax cup be with its upper edge and bottom surface on the Wax mold inner chamber, the distance on end opening edge is advisable greater than 4mm.

(2), normal pressure waters casting liquid and mixes broken wax bits: earlier in the cavity of the Wax mold that will be combined into through the discrete die assembly of wax liquid normal pressure injection that wax is handled, the liquid level of the wax liquid that injects is up to 6-8mm the time, mix broken wax bits again, when mixing broken wax bits, mix broken wax bits on one side, water casting liquid on one side, it is uniformly dispersed, the incorporation of broken wax bits is 1 with the ratio of the addition of wax liquid: 1-4, because broken wax bits are to form under the high pressure, so have high density, inner solid characteristic has suction-operated to the space in the wax liquid of cast under the normal pressure, waters the big deficiency of shrinkage depression degree that casting liquid brings under the normal pressure thereby overcome; When the liquid level of the mixed liquor of wax liquid and broken wax bits reaches mouth from Wax mold along 4mm, again the lower end of the high pressing die head of the high pressure belt cast gate wax cup selected for use is embedded in the mixed liquor that wax liquid and broken wax considers to be worth doing, the degree of depth that require to embed is not less than 4mm with the upper and lower surface distance on the interior accent edge of the surface, place of its upper edge and bottom surface and Wax mold, and the distance between the interior cavity wall of the outer wall of the high pressing die head of high pressure belt cast gate wax cup and Wax mold is 2-15mm.

(3), cooling: behind normal pressure wax liquid and the broken wax bits casting complete, put into cold water and cool off, after the cooling, take discrete die assembly away, promptly make the affiliated normal pressure of the present invention and strengthen the wax-pattern head.

Adopt the present invention to carry out sample or the less casting process production of foundry goods amount, through on probation in the our factory, its percent defective is reduced to 1-1.5% by original 15%, and product percent of pass obviously improves; And expense obviously reduces.

Beneficial effect of the present invention is: with at present under normal pressure, the making mould that adopts discrete die head die assembly to be combined into wax-pattern compares, owing in manufacturing process, mixed the broken wax bits that form under the high pressure, this broken wax bits density is big, adsorptivity is strong, so that the shrinkage depression degree of wax liquid is far smaller than is the shrinkage depression degree of wax liquid entirely, so improved the intensity of wax-pattern, and broken wax bits accelerate the cooling velocity of die head, have shortened the production cycle.

Description of drawings

Fig. 1, provided the schematic top plan view of the discrete die assembly of embodiment 1.

Fig. 2, provided the schematic top plan view of the high pressing die head of embodiment 1 selected high pressure belt cast gate wax cup.

Fig. 3, provided " one " font wax-pattern front-view schematic diagram that embodiment 1 produces.

The specific embodiment

Embodiment 1

Prepare a kind of " one " font wax-pattern, length is 600mm, and thickness, width are 8mm.Its shape such as Fig. 3.

Its production stage is as follows:

1, at first make discrete die assembly: by the founding casting length is that 600mm, an end have the aluminum alloy bar that length is the crossbeam of 80mm, two, and as discrete die assembly 1,2, as shown in Figure 1.With two discrete die assembly 1,2 make-ups, place on the metal plate 3, between two discrete die assembly 1,2 make-ups, form " one " font cavity 4, thereby constitute the Wax mold of making " one " font wax-pattern.Simultaneously, also will select the high pressing die head 5 of the bucket shape high pressure belt cast gate wax cup similar to " one " font cavity 4 shapes for use, the width of the high pressing die head 5 of bucket shape high pressure belt cast gate wax cup is 40mm, be equivalent to " one " font cavity 4 length 1/2; The width of the wax-pattern die head 5 of bucket shape high pressure belt cast gate wax cup is 40mm, be equivalent to " one " font cavity 4 length 1/2; The thickness of the high pressing die head 5 of bucket shape high pressure belt cast gate wax cup is 30cm, (height that does not contain cup), be equivalent to " one " font cavity 4 thickness 3/28.

2, normal pressure waters casting liquid and mixes broken wax bits: will inject under normal pressure through the wax liquid that dewaxing is handled earlier between two discrete outer mold assembly 1,2 make-ups in formation " one " font cavity 4, when the liquid level of the wax liquid that injects is 6mm, in wax liquid, mix broken wax bits by 1: 2 ratio arm casting liquid, limit again, and evenly disperse.When 4 mouthfuls of upper surface distance " one " font cavitys of the mixed liquor of wax liquid and broken wax bits the time along surface, place 40mm, high pressing die head 5 with the bucket shape high pressure belt cast gate wax cup selected for use embeds in the wax liquid again, and to make the bottom surface of the high pressing die head 5 of bucket shape high pressure belt cast gate wax cup be 4mm from the distance of metal plate 3, simultaneously constantly inject the wax liquid, and be sprinkled into broken wax by 1: 2 ratio simultaneously and consider to be worth doing to the high pressing die head 5 of bucket shape high pressure belt cast gate wax cup.When the surperficial 4mm in the high pressing die head 5 upper edge places of the mixed liquor surface distance bucket shape high pressure belt cast gate wax cup of wax liquid and the broken wax bits of cast in the high pressing die head 5 of bucket shape high pressure belt cast gate wax cup, stop to be sprinkled into broken wax bits, only inject wax liquid, till pouring into a mould liquid level and the surface, high pressing die head 5 upper edge places of bucket shape high pressure belt cast gate wax cup is equal.

3, cooling: put into cold water and cool off, after cooling, remove two discrete die assemblies 1,2, promptly make affiliated " one " font wax-pattern of present embodiment.

Claims (1)

1. a normal pressure strengthens the manufacture method of wax-pattern head, it is characterized in that being finished by following steps:

(1), at first make discrete die assembly: according to foundry goods shape, the size that will cast, produce discrete die assembly, and the die assembly that will disperse is combined into the Wax mold inner chamber, is placed on the metallic plate plane with aluminium alloy; Simultaneously, select the high pressing die head of the similar high pressure belt cast gate wax cup of the Wax mold cavity shape that is combined into to discrete die assembly for use, its size is greater than 1/4 of die head to be cast, less than 1/2 of die head to be cast, distance in the outer wall of high pressing die head and the Wax mold between the cavity wall is 2-15mm, the height of the high pressing die head of high pressure belt cast gate wax cup be with its upper edge and bottom surface from the distance on the upper and lower mouth edge of Wax mold inner chamber greater than 4mm;

(2), normal pressure waters casting liquid and mixes broken wax bits: earlier in the cavity of the Wax mold that will be combined into through the discrete die assembly of wax liquid normal pressure injection that wax is handled, the liquid level of the wax liquid that injects is up to 6-8mm the time, mix broken wax bits again, when mixing broken wax bits, mix broken wax bits on one side, water casting liquid on one side, the incorporation of broken wax bits is 1 with the ratio of the addition of wax liquid: 1-4; When the liquid level of the mixed liquor of wax liquid and broken wax bits reaches mouth from Wax mold along 4mm, again the lower end of the high pressing die head of the high pressure belt cast gate wax cup selected for use is embedded in the mixed liquor that wax liquid and broken wax considers to be worth doing, the degree of depth that require to embed is not less than 4mm with the upper and lower surface distance on the interior accent edge of the surface, place of its upper edge and bottom surface and Wax mold, and the distance between the interior cavity wall of the outer wall of the high pressing die head of high pressure belt cast gate wax cup and Wax mold is 2-15mm;

(3), cooling: behind normal pressure wax liquid and the broken wax bits casting complete, put into cold water and cool off, after the cooling, take discrete die assembly away, promptly make the affiliated normal pressure of the present invention and strengthen the wax-pattern head.

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