CN104630611A - Crucible for die-casting machine and casting technology of crucible for die-casting machine - Google Patents
Crucible for die-casting machine and casting technology of crucible for die-casting machine Download PDFInfo
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- CN104630611A CN104630611A CN201510106348.3A CN201510106348A CN104630611A CN 104630611 A CN104630611 A CN 104630611A CN 201510106348 A CN201510106348 A CN 201510106348A CN 104630611 A CN104630611 A CN 104630611A
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Abstract
The invention provides a crucible for a die-casting machine and a casting technology of the crucible for the die-casting machine. The casting technology comprises the following steps: selecting the following components by weight percent: 40-60% of scrap steel, 0-15% of cast iron, 20-40% of recycled material an 100-200kg of carburant; adding all scrap steel in a smelting device to heat, adding the cast iron after the scrap steel begins to melt, and adding the recycled material after the cast iron begins to melt, and adding the carburant in the smelting process; standing 5-8 min after the smelting device is warmed to 1500 DEG C and cooling by using clean recycled material; using a direct-reading spectrometer to sample melted liquid iron and performing the spectral analysis, judging whether the liquid iron component meets a predetermined standard, and if the liquid iron component meets the predetermined standard, adding copper in 0.35-0.45% of the liquid iron weight, chromium iron in 0.35-0.45% of the liquid iron weight and molybdenum iron in 0.13-0.15% of the liquid iron weight to perform high-temperature refining; feeding a nucleating agent when the liquid iron appears; pouring slagging off within 1 min to obtain the crucible for the die-casting machine. Through the adoption of the casting technology disclosed by the invention, the cast is heat-resistant and corrosion-resistant, is free from cracking and cannot be broken down, and the service life is greatly improved.
Description
Technical field
Patent of the present invention relates to casting field, particularly relates to a kind of casting technique and pressure die-casting machine crucible of pressure die-casting machine crucible.
Background technology
The crucible class foundry goods that pressure die-casting machine industry uses, its material is graphitic cast iron and HT300, and by conventional casting techniques method, HT300 is that foundry goods reduces the hardness of foundry goods by heat-treatment of annealing, improves plasticity, reduces unrelieved stress, makes microstructure and composition homogenizing.
In prior art, usually copper is added in stokehold batching, because the working conditions of crucible requires higher, zinc alloy solution to be carried in inside, continue to metallic solution heating, temperature at 415 ~ 430 DEG C, its use properties requirement and heat-and corrosion-resistant, and also having requirement to fatigue property, work-ing life is 1 year.The usual corrosion-resistant of foundry goods that existing material is made, with crackle, and easily breakdown, cause the foundry goods life-span low, only have 3-6 month work-ing life, cannot meet the demands and extensively be promoted.
Summary of the invention
The present invention is directed to the problems referred to above weak point, a kind of casting technique and pressure die-casting machine crucible of pressure die-casting machine crucible are provided, the performance and used life of foundry goods can be improved.
Technical scheme of the present invention is achieved in that
A casting technique for pressure die-casting machine crucible, comprising:
Choose raw material, described raw material comprises the component of following weight percent: steel scrap 40-60%, pig iron 0-15%, melt down material 20-40% and carburelant 100-200kg;
Melting, whole steel scrap is added in melting equipment and heats, the described pig iron is added after described steel scrap starts fusing, material is melted down described in adding after the described pig iron starts fusing, and in fusion process, add described carburelant, adopt after leaving standstill 5 ~ 8 minutes when described melting equipment is warming up to 1500 DEG C and totally melt down material cooling;
Spectroscopic analysis: adopt direct-reading spectrometer to carry out spectroscopic analysis to the molten iron sampling after fusing, judge whether hot metal composition meets preassigned, the copper that predetermined standard time adds weight of molten iron 0.35-0.45% is met at hot metal composition, the ferrochrome of 0.35-0.45%, the molybdenum-iron of 0.13-0.15% carries out high temperature refinery;
Breed: drop into nucleating agent during molten iron discharging, described nucleating agent content is 0.5% of weight of molten iron, stirs;
Cast: cast of skimming, the duration of pouring is T, and the weight of molten iron be poured on sand mo(u)ld is G, wherein, T=G
1/2, obtain pressure die-casting machine crucible.
Preferably, the preassigned of described hot metal composition comprises the component of following weight percent: carbon 3.0% ~ 3.1%, silicon 1.25% ~ 1.35%, manganese 0.9% ~ 1.1%, phosphorus 0.02%-0.08%, sulphur 0.02%-0.08%, chromium 0.35% ~ 0.45%, copper 0.35% ~ 0.45%, molybdenum 0.13% ~ 0.15%.
Preferably, before the step of described melting, also comprise:
Moulding; Choose self-hardening resin sand, add binding agent and solidifying agent, the weight of described binding agent is 0.9 ~ 1.2% of described self-hardening resin sand weight, and the weight of described solidifying agent is that 30 ~ 50% of described self-hardening resin sand weight carries out hand moulding;
Matched moulds: place mud bar or asbestos twine in joint face surrounding, sandbox keeps level, and driving adopts matched moulds at a slow speed, after matched moulds puts in place, carries out secondary mould closing after OOBA.
Preferably, after the step of described cast, also comprise:
Detect: to the single casting test block sampling after cast, check chemical composition, metallographic structure and mechanical property;
Aftertreatment: control soaking time, unpacked by the predetermined process time, and guarantee that the unpacking rear internal-external temperature difference of foundry goods is less, flawless produces, and carries out ball blast and polishing afterwards to foundry goods.
Preferably, described melting equipment is the medium-frequency induction furnace of CW2-PA2000 model.
Preferably, described binding agent is sodium silicate sand, and described solidifying agent is casting sulfonic acid.
Preferably, described in the step that breeds, comprising:
When molten iron proceeds to casting ladle 1/3, start successively evenly to throw nucleating agent, described nucleating agent is FeSi75;
All finish when subcontracting about to 2/3, first molten iron top layer is fully stirred, allow nucleating agent fully dissolve absorption.
Preferably, before the step of described cast, also comprise:
Thermometric, when temperature is higher than time temperature required, with chill cooling, pours into molten iron in single casting sand mo(u)ld.
Preferably, the step of described aftertreatment, comprising:
Unpack: first put into hot sandpit Slow cooling, then remove dead head and remove core;
Ball blast: cast-internal sand is all unwatered only;
Polishing: cast(ing) surface is tied sand, joint flash and fleshiness and remove clean.
A kind of pressure die-casting machine crucible, comprises the component of following weight percent: carbon 2.90% ~ 3.10%, silicon 1.60% ~ 1.80%, manganese 0.90% ~ 1.10%, phosphorus 0.02%-0.08%, sulphur 0.02%-0.08%, chromium 0.35% ~ 0.45%, copper 0.35% ~ 0.45%, molybdenum 0.13% ~ 0.15%.
The material composition of the present invention to the casting technique of pressure die-casting machine crucible and pressure die-casting machine crucible improves, add chromium, copper and molybdenum, add content of pearlite in alloy, improve thermotolerance and the erosion resistance of foundry goods, meet the crucible requirement of pressure die-casting machine enterprise, technical process for casting of the present invention is simplified, arrange rationally, cost is lower, and rarely waste product produces, be easy to produce, thus making low cost of manufacture of the present invention, product has the market competitiveness, simultaneously optimization design, technology difficulty is reduced, has good Scalable Performance.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the casting technique of pressure die-casting machine crucible in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Unless otherwise defined, technical term used herein or scientific terminology should be in field belonging to the present invention the ordinary meaning that the personage with general technical ability understands." first ", " second " that use in patent application specification of the present invention and claims and similar word do not represent any order, quantity or importance, and are only used to distinguish different integral parts.Equally, the similar word such as " ", " " or " being somebody's turn to do " does not represent quantity limitation yet, but represents to there is at least one." to comprise " or the similar word such as " comprising " means to occur that element before this word or object contain the element or object that appear at this word presented hereinafter and equivalent, and do not get rid of other elements or object." on ", D score, etc. only for representing relative position relation, when be described object absolute location change after, then this relative position relation also may correspondingly change." connection " is not limited to concrete type of attachment, can be direct connection, also can be indirectly connected by miscellaneous part, it can be non-removable connection, also can be dismountable connection, can be electric or signal connection, also can be machinery or physical connection.
Fig. 1 shows the schematic flow sheet of the casting technique of the pressure die-casting machine crucible that the embodiment of the present invention provides, and as shown in Figure 1, the casting technique of the pressure die-casting machine crucible of the present embodiment is as described below.
101, choose raw material, raw material comprises the component of following weight percent: steel scrap 40%-60%, pig iron 0-15%, melt down material 20%-40% and carburelant 100-200kg.
Principal element weight percent in the present embodiment in steel scrap meets table one:
| Project | Carbon | Silicon | Gao Meng | Low manganese | Phosphorus | Sulphur | Chromium |
| Content % | 0～0.5 | 0～1.0 | 0.7～2.0 | 0～0.7 | 0～0.08 | 0～0.05 | 0～0.25 |
Table one steel scrap specification
Principal element weight percent in the present embodiment in the pig iron meets table two:
| Project | Carbon | Silicon | Manganese | Phosphorus | Sulphur | Iron | Other |
| Content % | 3.4～5.4 | 1.25～1.6 | 0～0.8 | 0～0.08 | 0～0.05 | 91.0～95.0 | 0～0.2 |
Table two pig iron specification
Principal element weight percent in the present embodiment in carburelant meets table three:
| Project | Carbon | Sulphur | Moisture |
| Content % | 99.0～100 | 0～0.05 | 0～1.00 |
Table three carburelant specification
Be understandable that, in other examples, choosing of raw material also can adopt weight to be 1200kg steel scrap, the 450kg pig iron, 950kg melts down material, carburelant 25kg, ferrosilicon 15kg, ferromanganese 10kg casts, and the present embodiment does not specifically limit it, can limit voluntarily according to actual needs.
102, melting, whole steel scrap is added in melting equipment and heats, the described pig iron is added after described steel scrap starts fusing, material is melted down described in adding after the described pig iron starts fusing, and in fusion process, add described carburelant, adopt after leaving standstill 5 ~ 8 minutes when described melting equipment is warming up to 1500 DEG C and totally melt down material cooling.
In a particular application, melting equipment in the present embodiment adopts medium-frequency induction furnace-CW2-PA2000, electronic platform scale is adopted time reinforced, first steel scrap is added in medium-frequency induction furnace, smelting temperature rises always, is added by the pig iron after scrap melting part, adds and melt down material after pig iron melt portions, can add carburelant in the process of melting, heating makes load melting.
Also can add ferrosilicon and ferromanganese in a step 102, thus improve the content of silicon and manganese, its weight can limit voluntarily.
Wherein, the principal element weight percent in the present embodiment in ferrosilicon meets table four:
| Project | Carbon | Silicon | Manganese | Phosphorus | Sulphur | Chromium |
| Content % | 0～0.20 | 74.0～80.0 | 0～0.50 | 0～0.04 | 0～0.02 | 0～0.5 |
Table four ferrosilicon specification
Principal element weight percent in the present embodiment in ferromanganese meets table five:
| Project | Silicon | Manganese | Phosphorus | Sulphur |
| Content % | 0～4.50 | 65.0～72.0 | 0～0.4 | 0～0.03 |
Table five ferromanganese specification
103, spectroscopic analysis: adopt direct-reading spectrometer to carry out spectroscopic analysis to the molten iron sampling after fusing, judge whether hot metal composition meets preassigned, the copper of weight of molten iron 0.35%-0.45% is added after hot metal composition meets preassigned, the ferrochrome of 0.35%-0.45%, the molybdenum-iron of 0.13%-0.15% carries out high temperature refinery.
It should be noted that and to leave standstill when medium-frequency induction furnace rises to 1500 DEG C, carry out spectroscopic analysis to the sampling of stokehold molten iron, the present embodiment adopts the direct-reading spectrometer of ARL3460OES model, but is not limited to this, and there is a lot of scum silica frost on molten iron top layer, needs cleaning to remove.
In the present embodiment, meet the hot metal composition of preassigned, the component of following weight percent should be comprised: carbon 3.0% ~ 3.1%, silicon 1.25% ~ 1.35%, manganese 0.9% ~ 1.1%, phosphorus 0.02%-0.08%, sulphur 0.02%-0.08%, chromium 0.35% ~ 0.45%, copper 0.35% ~ 0.45%, molybdenum 0.13% ~ 0.15%.
If hot metal composition does not meet preassigned, then should adjust for corresponding constituent content, add the electrolytic copper (Cu >=99%) of weight of molten iron 0.35%-0.45% after up to standard, the ferrochrome of 0.35%-0.45%, the molybdenum-iron of 0.13-0.15% carries out high temperature refinery.
Wherein, the principal element weight percent in the present embodiment in ferrochrome meets table six:
| Project | Silicon | Phosphorus | Sulphur | Chromium |
| Content % | 0～5.0 | 0～0.06 | 0～0.06 | 60.0～100.0 |
Table six ferrochrome specification
Principal element weight percent in the present embodiment in molybdenum-iron meets table seven:
| Project | Carbon | Silicon | Phosphorus | Sulphur | Molybdenum | Copper | Antimony | Tin |
| Content % | 0～0.2 | 0～1.0 | 0～0.08 | 0～0.1 | 55.0～100.0 | 0～0.5 | 0～0.05 | 0～0.06 |
Table seven molybdenum-iron specification
Afterwards temperature is risen to 1500 ~ 1520 DEG C and leave standstill 5 ~ 8min, now allow molten iron roll, inner bits, floating to surface, add and melt down material cooling, then carry out secondary slagging-off.
104, breed: drop into nucleating agent during molten iron discharging, described nucleating agent content is 0.5% of weight of molten iron, stirs.
In the present embodiment, when molten iron proceeds to casting ladle 1/3, start successively evenly to throw nucleating agent, described nucleating agent is FeSi75; All finish when subcontracting about to 2/3, first molten iron top layer is fully stirred, thus make nucleating agent fully dissolve absorption.
Wherein, the principal element weight percent in the present embodiment in nucleating agent meets:
| Project | Silicon | Barium | Calcium | Aluminium |
| Content % | 65.0～97.4 | 1.3～3.0 | 1.3～3.0 | 0～3.0 |
105, pour into a mould: cast of skimming, the duration of pouring, within 1 minute, obtains pressure die-casting machine crucible.
Be understandable that, this step need place dead head by processing requirement, all cover plate must be built before enclosing sand, after nucleating agent fully dissolves absorption, remove the gred to molten iron surface and be advisable without obvious impurity floating, with air pressure gun, the deslagging agent that bag wall is residual is blown clean, when temperature is higher than time temperature required, lower the temperature with chill, molten iron is poured in single casting sand mo(u)ld, qualified rear molten iron surface coverage one deck deslagging agent, carries out pushing off the slag, finally pours into a mould, the duration of pouring is T, the weight of molten iron be poured on sand mo(u)ld is G, wherein, and T=G
1/2, in the present embodiment, be no more than 60 seconds the duration of pouring.
The casting technique of the pressure die-casting machine crucible in the present embodiment, by adding the pig iron, steel scrap in stokehold, melting down material, carburelant, alloy adds copper, chromium and molybdenum and carries out melting, by adding chromium, copper and molybdenum, adding content of pearlite in alloy, improving thermotolerance and the erosion resistance of foundry goods, try out through for some time and meet the crucible requirement of pressure die-casting machine enterprise, and gradation composition improves, melt casting process of the present invention is more optimized rationally, and cost is lower.
In another embodiment, the casting technique of pressure die-casting machine crucible of the present invention, also comprised not shown step 102a and 102b before step 102:
102a, moulding; Choose self-hardening resin sand, add binding agent and solidifying agent, the weight of described binding agent is 0.9 ~ 1.2% of described self-hardening resin sand weight, and the weight of described solidifying agent is that 30 ~ 50% of described self-hardening resin sand weight carries out hand moulding.
In the present embodiment, casting section thickness scope is 12 ~ 40mm, and weight range is 54 ~ 249kg, and the self-hardening resin sand of employing meets national standard JB/T9224-1999, as shown in Table 8:
| Project | SiO2％ | Silt content % | Water content % | Dihedral coefficient | Acid consumption value | Igloss amount |
| Specification | ≥95％ | ≤0.2 | ≤0.2 | ≤1.3 | ≤4 | ≤0.4 |
Table eight resin sand specification
The present embodiment adopt hand moulding, binding agent is sodium silicate sand, and the add-on of sodium silicate sand is 0.9 ~ 1.2% of weight resin, the essential substance content of sodium silicate sand and parameter as shown in Table 9:
| Project | SiO 2％ | Silt content % | Water content % | Dihedral coefficient | Granularity (order) |
| Specification | ≥93％ | ≤0.5 | ≤0.3 | ≤1.3 | 70～140 |
Table nine sodium silicate sand specification
Further, shown solidifying agent is casting sulfonic acid, reference standard HG/T2345-92, and the add-on of solidifying agent is 30 ~ 50% of weight resin, the essential substance content of solidifying agent and parameter as shown in Table 10:
| Project | Strong acid curing dose of A | Weak acid solidifying agent B | Winter solidifying agent |
| Density (g/cm 3) | 1.2～1.5 | 1.2～1.5 | 1.2～1.5 |
| Viscosity (mpa.s, 20 DEG C) | 10～30 | 10～30 | 10～30 |
| Total acidity (H 2SO 4) | 20～35 | 5～20 | 35～50 |
| Free sulfuric acid (%) | ≤15 | ≤5 | ≤25 |
Table ten solidifying agent specification
In a particular application, the present invention adopts sand under 25 tons of sand mills (model is SIPRON-250), measure the content of resin sand, sodium silicate sand and solidifying agent, checked the liquid level in resin, solidifying agent container and the sand position in sand storage, guarantee correctly adding of sand resin, solidifying agent.
102b, matched moulds: place mud bar or asbestos twine in joint face surrounding, sandbox keeps level, and driving adopts matched moulds at a slow speed, after matched moulds puts in place, carries out secondary mould closing after OOBA.
In step 102b, casting mold level is put, and paves at sandbox corner cushion block, in case bursting casting mold; Casting mold die cavity must not have defect, plucking phenomenon, and the large resin sand of defect is repaired, and the little sodium silicate sand of defect is repaired; Check whether upper and lower case casting mold is out of shape with ruler; Top box is turned over whether unimpeded by torch light inspection gating system; Confirm that the position of putting cast gate must be smooth, rough phenomenon cannot be had, blow clean, be coated with a graphite paint, and rapid fire dryout; With Gas spray gun, casting mold and chill position are toasted one time, guarantee that die cavity is fully dry; Check that in die cavity, loose sand is thoroughly cleaned out with torch; Binding agent, mud rope must be beaten outside sand mo(u)ld steady brace; Sandbox keeps level, and driving adopts matched moulds at a slow speed, after matched moulds puts in place, carries out secondary mould closing after OOBA; Check the phenomenon whether joint face has fash or do not put in place; With cover plate, dead head is built, prevent knockout; Four screw rods are locked at two diagonal angles, prevent mismatch, stack for two casees and need corner pad (wood) block to pave.
Closer, in another embodiment, the casting technique of the pressure die-casting machine crucible in the present invention, after described step 105, also comprises not shown step 106 and 107:
106, detect: to the single casting test block sampling after cast, check chemical composition, metallographic structure and mechanical property.
In the present embodiment, foundry goods detects in the single casting test block after same batch of cast, tensile strength adopts tension testing machine (WAW-300) to record, and hardness adopts testing machine (King3000) to record, and single casting sample performance test result is as shown in table ten one:
Table ten one single casting sample performance detects
107, aftertreatment: control soaking time, unpacked by the predetermined process time, and guarantee that the unpacking rear internal-external temperature difference of foundry goods is less, flawless produces, and carries out ball blast and polishing afterwards to foundry goods.
Wherein, step 107 specifically comprises the steps:
1071, unpack, first put into hot sandpit Slow cooling unpack after, then remove dead head and remove core.
In the present embodiment, produce the defects such as distortion, crackle for preventing foundry goods after being cast because cooling too fast, ensure that foundry goods has enough intensity and toughness when sand removal, foundry goods should have enough cooling times in die cavity, foundry goods is determine according to temperature 400 DEG C of unpacking the cooling time in sand mold
1072, ball blast: adopt suspension-type shot-blasting machine (Q37100) to be framed up by foundry goods, when throwing foundry goods, cast-internal sand all must be unwatered only, after ball blast, surface roughness need reach ISO-8501 standard.
1073, polish: cast(ing) surface is tied sand, joint flash and fleshiness and remove clean.
The foundry goods that the foundry goods that the present embodiment is produced is produced than prior art, its work-ing life extends to about 1 year, and there is stable metallographic structure and mechanical property, obtain the affirmative of user, in the production process of graphitic cast iron, add copper by adopting to molten iron, chromium, molybdenum carry out alloying, on the basis of intensity, castability, wear resisting property, machinability, low notch sensitive performance etc. retaining better graphitic cast iron, the technical problem of Shrinkage Porosity in Gray Cast Iron tendency and foundry goods shrinkage cavity thereof can also be effectively reduced.
The embodiment of the present invention also provides a kind of pressure die-casting machine crucible, comprise the component of following weight percent: carbon 2.90% ~ 3.10%, silicon 1.60% ~ 1.80%, manganese 0.90% ~ 1.10%, phosphorus 0.02%-0.08%, sulphur 0.02%-0.08%, chromium 0.35% ~ 0.45%, copper 0.35% ~ 0.45%, molybdenum 0.13% ~ 0.15%.
It should be noted that the pressure die-casting machine crucible of the present embodiment can obtain according to aforesaid method, repeat no more herein.
In a particular application, after considering stove, scaling loss can reduce the content of carbon, can increase the content of silicon after breeding, and therefore, after stove, pressure die-casting machine crucible should meet above-mentioned requirements.
The present invention carries out pressure die-casting machine crucible prepared by alloying after casting by introducing copper, chromium and molybdenum, its Shrinkage Porosity tendency is little or without shrinkage cavity, its property indices meets higher requirement completely, in addition, the present invention is the graphitic cast iron of pearlite matrix, its content of pearlite in alloy is high, and purposes is wide, is particularly useful for the casting of the important parts such as lathe bed, body.
These are only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a casting technique for pressure die-casting machine crucible, is characterized in that, comprising:
Choose raw material, described raw material comprises the component of following weight percent: steel scrap 40-60%, pig iron 0-15%, melt down material 20-40% and carburelant 100-200kg;
Melting, whole steel scrap is added in melting equipment and heats, the described pig iron is added after described steel scrap starts fusing, material is melted down described in adding after the described pig iron starts fusing, and in fusion process, add described carburelant, adopt after leaving standstill 5 ~ 8 minutes when described melting equipment is warming up to 1500 DEG C and totally melt down material cooling;
Spectroscopic analysis: adopt direct-reading spectrometer to carry out spectroscopic analysis to the molten iron sampling after fusing, judge whether hot metal composition meets preassigned, the copper of weight of molten iron 0.35-0.45% is added after hot metal composition meets preassigned, the ferrochrome of 0.35-0.45%, the molybdenum-iron of 0.13-0.15% carries out high temperature refinery;
Breed: drop into nucleating agent during molten iron discharging, described nucleating agent content is 0.5% of weight of molten iron, stirs;
Cast: cast of skimming, the duration of pouring is T, and the weight of molten iron be poured on sand mo(u)ld is G, wherein, T=G
1/2, obtain pressure die-casting machine crucible.
2. the casting technique of pressure die-casting machine crucible according to claim 1, it is characterized in that, the preassigned of described hot metal composition comprises the component of following weight percent: carbon 3.0% ~ 3.1%, silicon 1.25% ~ 1.35%, manganese 0.9% ~ 1.1%, phosphorus 0.02%-0.08%, sulphur 0.02%-0.08%, chromium 0.35% ~ 0.45%, copper 0.35% ~ 0.45%, molybdenum 0.13% ~ 0.15%.
3. the casting technique of pressure die-casting machine crucible according to claim 1, is characterized in that, before the step of described melting, also comprises:
Moulding; Choose self-hardening resin sand, add binding agent and solidifying agent, the weight of described binding agent is 0.9 ~ 1.2% of described self-hardening resin sand weight, and the weight of described solidifying agent is that 30 ~ 50% of described self-hardening resin sand weight carries out hand moulding;
Matched moulds: place mud bar or asbestos twine in joint face surrounding, sandbox keeps level, and driving adopts matched moulds at a slow speed, after matched moulds puts in place, carries out secondary mould closing after OOBA.
4. the casting technique of pressure die-casting machine crucible according to claim 1, is characterized in that, after the step of described cast, also comprises:
Detect: to the single casting test block sampling after cast, check chemical composition, metallographic structure and mechanical property;
Aftertreatment: control soaking time, unpacked by the predetermined process time, and guarantee that the unpacking rear internal-external temperature difference of foundry goods is less, flawless produces, and carries out ball blast and polishing afterwards to foundry goods.
5. the casting technique of pressure die-casting machine crucible according to claim 1, is characterized in that, described melting equipment is the medium-frequency induction furnace of CW2-PA2000 model.
6. the casting technique of pressure die-casting machine crucible according to claim 3, is characterized in that, described binding agent is sodium silicate sand, and described solidifying agent is casting sulfonic acid.
7. the casting technique of pressure die-casting machine crucible according to claim 1, is characterized in that, described in the step that breeds, comprising:
When molten iron proceeds to casting ladle 1/3, start successively evenly to throw nucleating agent, described nucleating agent is FeSi75;
All finish when subcontracting about to 2/3, first molten iron top layer is fully stirred, allow nucleating agent fully dissolve absorption.
8. the casting technique of pressure die-casting machine crucible according to claim 1, is characterized in that, before the step of described cast, also comprises:
Thermometric, when temperature is higher than time temperature required, with chill cooling, pours into molten iron in single casting sand mo(u)ld.
9. the casting technique of pressure die-casting machine crucible according to claim 4, is characterized in that, the step of described aftertreatment, comprising:
Unpack: first put into hot sandpit Slow cooling, then remove dead head and remove core;
Ball blast: cast-internal sand is all unwatered only;
Polishing: cast(ing) surface is tied sand, joint flash and fleshiness and remove clean.
10. a pressure die-casting machine crucible, it is characterized in that, comprise the component of following weight percent: carbon 2.90% ~ 3.10%, silicon 1.60% ~ 1.80%, manganese 0.90% ~ 1.10%, phosphorus 0.02%-0.08%, sulphur 0.02%-0.08%, chromium 0.35% ~ 0.45%, copper 0.35% ~ 0.45%, molybdenum 0.13% ~ 0.15%.
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| CN107175317A (en) * | 2017-04-27 | 2017-09-19 | 牡丹江中车金缘铸业有限公司 | A kind of rare earth modified water-glass sand track scale measures the casting technique of counterweight |
| CN110016606A (en) * | 2019-05-17 | 2019-07-16 | 重庆银河铸锻有限责任公司 | A kind of electro-smelting method of high-strength cast iron part |
| CN110129660A (en) * | 2019-05-17 | 2019-08-16 | 重庆银河铸锻有限责任公司 | A kind of electro-smelting method of corrosion-resistant High-Hardness Cast Iron part |
| CN113290207A (en) * | 2021-04-30 | 2021-08-24 | 宁波明凌科技有限公司 | Large sand mold crack repairing method |
| CN115821149A (en) * | 2022-11-30 | 2023-03-21 | 南阳飞龙汽车零部件有限公司 | Method for solving cracks of cast steel products |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107175317A (en) * | 2017-04-27 | 2017-09-19 | 牡丹江中车金缘铸业有限公司 | A kind of rare earth modified water-glass sand track scale measures the casting technique of counterweight |
| CN110016606A (en) * | 2019-05-17 | 2019-07-16 | 重庆银河铸锻有限责任公司 | A kind of electro-smelting method of high-strength cast iron part |
| CN110129660A (en) * | 2019-05-17 | 2019-08-16 | 重庆银河铸锻有限责任公司 | A kind of electro-smelting method of corrosion-resistant High-Hardness Cast Iron part |
| CN110016606B (en) * | 2019-05-17 | 2022-01-25 | 重庆机床(集团)有限责任公司 | Electric furnace smelting method for high-strength iron castings |
| CN113290207A (en) * | 2021-04-30 | 2021-08-24 | 宁波明凌科技有限公司 | Large sand mold crack repairing method |
| CN115821149A (en) * | 2022-11-30 | 2023-03-21 | 南阳飞龙汽车零部件有限公司 | Method for solving cracks of cast steel products |
| CN115821149B (en) * | 2022-11-30 | 2024-04-09 | 南阳飞龙汽车零部件有限公司 | Method for solving cracks of cast steel products |
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