CN104525854A - Mold and method for testing melting degree of internal chill - Google Patents
Mold and method for testing melting degree of internal chill Download PDFInfo
- Publication number
- CN104525854A CN104525854A CN201510032325.2A CN201510032325A CN104525854A CN 104525854 A CN104525854 A CN 104525854A CN 201510032325 A CN201510032325 A CN 201510032325A CN 104525854 A CN104525854 A CN 104525854A
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- CN
- China
- Prior art keywords
- testing
- die cavity
- internal densener
- rod iron
- cavity
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/60—Specific applications or type of materials
- G01N2223/624—Specific applications or type of materials steel, castings
Abstract
The invention relates to a mold for testing the melting degree of internal chill. The mold comprises a main body, wherein the main body is in a rectangular shape, and a rectangular cavity is arranged inside the main body; the bottom of the cavity is communicated with the outside through a pouring channel arranged at one side of the cavity, and the lower end of the pouring channel is communicated with the cavity; a bell mouth is formed in the upper end of the pouring channel, and a plurality of vertically parallel steel bars are arranged inside the cavity; each steel bar is positioned in a vertical plane where a central line of the bottom surface of the cavity is located along the rectangular length direction, and a distance between two adjacent steel bars is equal. A method for testing the melting degree of internal chill by using the mold comprises the steps of pouring, measuring the temperature, solidifying and sampling, cutting samples and observing, carrying out a cycle test, and carrying out data analysis. The mold and the method for testing the melting degree of internal chill are used for quickly and accurately testing the relation between the internal chill modulus as well as the pouring temperature and the casting modulus, thus a design method of internal chill is obtained, and the internal chill suitable for thick and large iron castings can be reasonably designed and poured.
Description
Technical field
The present invention relates to a kind of mould and the method for testing thereof that melt degree for testing internal densener.
Background technology
When the casting Technology Design of foundry goods, chill is used to accelerate the cooling velocity of foundry goods part in casting process.Foundry goods because its structure need cause various piece wall unevenness, some positions are very thick, and in the process of cooling, just cooling is slow, the thin position of wall thickness just cooling fast, make each position cooling velocity of same foundry goods uneven.The result caused likely produces shrinkage cavity or position drawing crack thin for wall.In order to avoid the generation of this phenomenon, after moulding completes, just place chill at the position that wall thickness is thick, absorb the temperature of molten metal with it, accelerate the cooling velocity at this position, shorten the time difference of the position cooling thin with other wall thickness.No matter be solidify control technology or consecutive solidification control technology, chill is all widely used simultaneously.
Chill divides internal densener and external chill, direct external chill is placed on casting exterior, directly contact with foundry goods, time metal liquid cast enters casting mold die cavity, directly contact with chill and carry out strong heat exchange, metal liquid cools fast, but concerning some thick and large castings, external chill is only relied on to cool the process of setting of uncontrollable foundry goods, foundry goods center is cold still slow, coarse grains, for this reason, adopt the technological design of internal densener, cold metal is placed in casting mold, when metal liquid enters casting mold die cavity time, metal liquid surrounds internal densener, with internal densener generation heat exchange, internal densener is heated, metal liquid cools, meanwhile, internal densener surface and metal liquid generation metallurgical reaction, internal densener surface melting, when metal liquid solidifies completely, the tissue that metal liquid solidifies and internal densener combine, form complete foundry goods.For reaching the requirement of internal densener surface melting, the size of internal densener, shape and quantity all need accurate calculating and design, internal densener is too little, melted completely by metal liquid at casting process, the cooling effect of metal liquid is less, and internal densener is excessive, and metal liquid can not melt the surface of internal densener, between internal densener and foundry goods, form interface, cause foundry goods to be scrapped.At internal densener design aspect, design manual just provides the empirical data of cast steel internal densener design, and computing formula does not provide strict condition, and deviation, often appears in the such as requirement such as internal densener component requirements and pouring temperature when causing internal densener to design; And the internal densener design aspect of cast iron, the related data almost do not designed at present.Therefore, in design cast iron internal chill, appropriate design has important theory value and practical advice meaning with the production using internal densener for thick large ironcasting.
Summary of the invention
The technical problem to be solved in the present invention is: in order to overcome the deficiencies in the prior art, provides a kind of mould and the method for testing thereof that melt degree for testing internal densener.
The technical solution adopted for the present invention to solve the technical problems is: a kind of mould for testing internal densener fusing degree, comprise main body, described main body is rectangle, described body interior is provided with rectangle mold cavity, the bottom of described die cavity is by being arranged on cast passage and the ft connection of die cavity side, described cast passage lower end is communicated with die cavity, the upper end of cast passage is provided with horn mouth, described die cavity inside is provided with some rod irons vertically be arranged in parallel, each rod iron is all positioned at the vertical plane at the center line place along rectangle length direction of die cavity bottom surface, spacing between adjacent two rod irons is equal.
As preferably, the length of described main body is 400mm, and width is 40mm, and be highly 300mm, described rod iron has 5, and the diameter of 5 rod irons is respectively 5mm, 8mm, 10mm, 12mm and 15mm, and the spacing between two adjacent rod irons is 50mm.
As preferably, described rod iron is mild steel, medium carbon steel, high-carbon steel or stainless steel material.
Adopting an internal densener fusing Tachistoscope method for the above-mentioned mould for testing internal densener fusing degree, comprising the following steps:
1) pour into a mould: molten metal is poured into a mould in die cavity by cast passage;
2) thermometric: after pouring metal melt enters die cavity, measures and record pouring temperature;
3) solidify sampling: after molten metal is full of die cavity, after waiting for that molten metal solidifies cooling, then take out casting sample;
4) cut sample to observe: the sample cutting rod iron and foundry goods interface by the method for Linear cut, then cut in the middle of sample, carry out observing and recording data;
5) loop test: repeat step 1), 2), 3), 4), draw many groups cut sample after data;
6) data analysis: the fusion situation adopting OM and the every root rod iron of sem analysis and molten metal, draws test data.
Particularly, in step 1), before cast, first bead is carried out to the surface of rod iron.
Particularly, in step 4), sample is observed after carrying out metallurgical polishing to it after cutting again.
Particularly, when sample thickness is 40mm, when pouring temperature is 1500 DEG C, rod iron is 20# steel, and molten metal is casting pig HT250.
The invention has the beneficial effects as follows: this is used for testing the relation that the mould of internal densener fusing degree and method of testing thereof can test out internal densener modulus and pouring temperature and casting modulus rapidly and accurately, and then draw the method for designing of internal densener, can reasonable design and water the internal densener outpouring and be applicable to thick large ironcasting more.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the structural representation of the mould for testing internal densener fusing degree of the present invention;
In figure: 1. main body, 2. die cavity, 3. rod iron, 4. pour into a mould passage.
Detailed description of the invention
In conjunction with the accompanying drawings, the present invention is further detailed explanation.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present invention are described in a schematic way, and therefore it only shows the formation relevant with the present invention.
As shown in Figure 1, a kind of mould for testing internal densener fusing degree, comprise main body 1, described main body 1 is rectangle, described main body 1 inside is provided with rectangle mold cavity 2, the bottom of described die cavity 2 is by being arranged on cast passage 4 and the ft connection of die cavity 2 side, described cast passage 4 lower end is communicated with die cavity 2, the upper end of cast passage 4 is provided with horn mouth, described die cavity 2 inside is provided with some rod irons 3 vertically be arranged in parallel, each rod iron 3 is all positioned at the vertical plane at the center line place along rectangle length direction of die cavity 2 bottom surface, spacing between adjacent two rod irons 3 is equal.
As preferably, the length of described main body 1 is 400mm, and width is 40mm, is highly 300mm, and described rod iron 3 has 5, and the diameter of 5 rod irons 3 is respectively 5mm, 8mm, 10mm, 12mm and 15mm, and the spacing between two adjacent rod irons 3 is 50mm.
As preferably, described rod iron 3 is mild steel, medium carbon steel, high-carbon steel or stainless steel material.
Adopting an internal densener fusing Tachistoscope method for the above-mentioned mould for testing internal densener fusing degree, comprising the following steps:
1) pour into a mould: molten metal is poured into a mould in die cavity 2 by cast passage 4;
2) thermometric: after pouring metal melt enters die cavity 2, measures and record pouring temperature;
3) solidify sampling: after molten metal being full of die cavity 2, after waiting for that molten metal solidifies cooling, then take out casting sample;
4) cut sample to observe: cut rod iron 3 and the sample at foundry goods interface by the method for Linear cut, then cut in the middle of sample, carry out observing and recording data;
5) loop test: repeat step 1), 2), 3), 4), draw many groups cut sample after data;
6) data analysis: the fusion situation adopting OM and the every root rod iron 3 of sem analysis and molten metal, draws test data.
Particularly, in step 1), before cast, first bead is carried out to the surface of rod iron 3.
Particularly, in step 4), sample is observed after carrying out metallurgical polishing to it after cutting again.
Particularly, when sample thickness is 40mm, when pouring temperature is 1500 DEG C, rod iron 3 is 20# steel, and molten metal is casting pig HT250.
Bead also claims shot peening strengthening, is to reduce part fatigue, improves one of the effective ways in life-span; Shot-peening is used to remove thickness and is not less than 2mm's or does not require to keep on medium-sized, the Large metallic articles of accurate size and profile and forging and casting oxide skin, iron rust, molding sand and old paint film; Here shot-peening is adopted mainly to remove greasy dirt on rod iron 3 and iron rust.
When molten metal is full of foundry goods die cavity 2, rod iron 3 and molten metal carry out heat exchange, cause the temperature of the center liquid metal of foundry goods first to be solidified lower than other parts of foundry goods, the temperature of cast-internal is raised gradually from inside to outside, be conducive to the feeding of foundry goods, can sound casting be obtained; Before foundry goods does not solidify, there is certain metallurgical reaction in high-temperature liquid metal and rod iron 3 surface, make rod iron 3 surface melting, when solidifying, rod iron 3 and foundry goods combine; If rod iron 3 diameter is large, pouring temperature is low, and molten metal and rod iron 3 surface metallurgical reaction can not occur, and when solidifying, rod iron 3 and foundry goods can not be in conjunction with, form not fused interface.
The checkout procedure of rod iron 3 and foundry goods fusion situation, casting complete also, after waiting for foundry goods cooling, clears up foundry goods, then cuts in the middle of test block, observes after metallurgical polishing; Through many experiments, the relation of rod iron 3 and foundry goods metallurgical melting and pouring temperature and rod iron diameter can be obtained; In addition, change the size of foundry goods, carry out identical experiment, under also can obtaining different casting thickness, when rod iron 3 and foundry goods metallurgical melting, the relation of pouring temperature and rod iron 3 diameter.
Wherein, OM is light microscope, and SEM is SEM.
Compared with prior art, this is used for testing the relation that the mould of internal densener fusing degree and method of testing thereof can test out internal densener modulus and pouring temperature and casting modulus rapidly and accurately, and then draw the method for designing of internal densener, can reasonable design and water the internal densener outpouring and be applicable to thick large ironcasting more.
With above-mentioned according to desirable embodiment of the present invention for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this invention technological thought, can carry out various change and amendment completely.The technical scope of this invention is not limited to the content on description, must determine its technical scope according to right.
Claims (7)
1. one kind melts the mould of degree for testing internal densener, it is characterized in that, comprise main body (1), described main body (1) is rectangle, described main body (1) inside is provided with rectangle mold cavity (2), the bottom of described die cavity (2) is by being arranged on cast passage (4) and the ft connection of die cavity (2) side, described cast passage (4) lower end is communicated with die cavity (2), the upper end of cast passage (4) is provided with horn mouth, described die cavity (2) inside is provided with some rod irons (3) vertically be arranged in parallel, each rod iron (3) is all positioned at the vertical plane at the center line place along rectangle length direction of die cavity (2) bottom surface, spacing between adjacent two rod irons (3) is equal.
2. as claimed in claim 1 for testing the mould of internal densener fusing degree, it is characterized in that, the length of described main body (1) is 400mm, width is 40mm, be highly 300mm, described rod iron (3) has 5, and the diameter of 5 rod irons (3) is respectively 5mm, 8mm, 10mm, 12mm and 15mm, and the spacing between two adjacent rod irons (3) is 50mm.
3., as claimed in claim 1 for testing the mould of internal densener fusing degree, it is characterized in that, described rod iron (3) is mild steel, medium carbon steel, high-carbon steel or stainless steel material.
4. adopting an internal densener fusing Tachistoscope method for the mould for testing internal densener fusing degree described in any one of claim 1-3, it is characterized in that, comprise the following steps:
Cast: molten metal is poured into a mould in die cavity (2) by cast passage (4);
Thermometric: after pouring metal melt enters die cavity (2), pouring temperature is measured and record;
Solidify sampling: after molten metal being full of die cavity (2), after waiting for that molten metal solidifies cooling, then take out casting sample;
Cut sample to observe: cut rod iron (3) and the sample at foundry goods interface by the method for Linear cut, then cut in the middle of sample, carry out observing and recording data;
Loop test: repeat step 1), 2), 3), 4), draw many groups cut sample after data;
Data analysis: the fusion situation adopting OM and the every root rod iron (3) of sem analysis and molten metal, draws test data.
5. the method for testing of internal densener fusing degree as claimed in claim 4, is characterized in that, in step 1), before cast, first carry out bead to the surface of rod iron (3).
6. the method for testing of internal densener fusing degree as claimed in claim 4, it is characterized in that, in step 4), sample is observed after carrying out metallurgical polishing to it after cutting again.
7. the method for testing of internal densener fusing degree as claimed in claim 4, it is characterized in that, when sample thickness is 40mm, when pouring temperature is 1500 DEG C, rod iron (3) is 20# steel, and molten metal is casting pig HT250.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510032325.2A CN104525854A (en) | 2015-01-22 | 2015-01-22 | Mold and method for testing melting degree of internal chill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510032325.2A CN104525854A (en) | 2015-01-22 | 2015-01-22 | Mold and method for testing melting degree of internal chill |
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| Publication Number | Publication Date |
|---|---|
| CN104525854A true CN104525854A (en) | 2015-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510032325.2A Pending CN104525854A (en) | 2015-01-22 | 2015-01-22 | Mold and method for testing melting degree of internal chill |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0452065A (en) * | 1990-06-15 | 1992-02-20 | Toyota Central Res & Dev Lab Inc | Method for inserting metal-base complex material as internal chill |
| CN101406950A (en) * | 2008-11-18 | 2009-04-15 | 西安建筑科技大学 | Method for preparing composite abrasion-proof lining board |
| CN102744389A (en) * | 2012-07-27 | 2012-10-24 | 湖南三星机床工具有限公司 | Dead head-free casting technology |
| CN103934438A (en) * | 2014-04-30 | 2014-07-23 | 江苏理工学院 | Casting method for thick and large steel casting through internal chill |
| CN204413050U (en) * | 2015-01-22 | 2015-06-24 | 江苏理工学院 | For testing the mould of internal densener fusing degree |
-
2015
- 2015-01-22 CN CN201510032325.2A patent/CN104525854A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0452065A (en) * | 1990-06-15 | 1992-02-20 | Toyota Central Res & Dev Lab Inc | Method for inserting metal-base complex material as internal chill |
| CN101406950A (en) * | 2008-11-18 | 2009-04-15 | 西安建筑科技大学 | Method for preparing composite abrasion-proof lining board |
| CN102744389A (en) * | 2012-07-27 | 2012-10-24 | 湖南三星机床工具有限公司 | Dead head-free casting technology |
| CN103934438A (en) * | 2014-04-30 | 2014-07-23 | 江苏理工学院 | Casting method for thick and large steel casting through internal chill |
| CN204413050U (en) * | 2015-01-22 | 2015-06-24 | 江苏理工学院 | For testing the mould of internal densener fusing degree |
Non-Patent Citations (2)
| Title |
|---|
| B.П.杰斯涅茨基: "铸钢件的内冷铁", 《铸造》 * |
| 刘耀辉等: "高速钢/结构钢双金属复合材料界面研究", 《特种铸造及有色合金》 * |
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Application publication date: 20150422 |
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