CN86107807A - Iron machine performance rapid test method and device thereof - Google Patents
Iron machine performance rapid test method and device thereof Download PDFInfo
- Publication number
- CN86107807A CN86107807A CN86107807.1A CN86107807A CN86107807A CN 86107807 A CN86107807 A CN 86107807A CN 86107807 A CN86107807 A CN 86107807A CN 86107807 A CN86107807 A CN 86107807A
- Authority
- CN
- China
- Prior art keywords
- eigenwert
- analysis curve
- differential analysis
- machine performance
- cast iron
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 9
- 238000010998 test method Methods 0.000 title claims abstract description 5
- 238000004458 analytical method Methods 0.000 claims abstract description 23
- 230000005496 eutectics Effects 0.000 claims abstract description 11
- 229910001018 Cast iron Inorganic materials 0.000 claims abstract description 10
- 230000009466 transformation Effects 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 239000013078 crystal Substances 0.000 claims abstract description 4
- 238000005266 casting Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 238000002076 thermal analysis method Methods 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 3
- 239000007858 starting material Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims 1
- 230000009931 harmful effect Effects 0.000 abstract 1
- 230000002277 temperature effect Effects 0.000 abstract 1
- 238000002474 experimental method Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012417 linear regression Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- DBUTVDSHVUGWOZ-UHFFFAOYSA-N [Si].[Ni].[Cr].[Ni] Chemical compound [Si].[Ni].[Cr].[Ni] DBUTVDSHVUGWOZ-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Images
Abstract
Iron machine performance rapid test method and device thereof are the mechanical propertys that is used for fast measuring cast iron, it is characterized in that it is with liquidus temperature T
L, maximum cooling velocity KB and eutectic transformation after primary crystal changes on the differential analysis curve begin to the time interval τ between the eutectic transformation peak dot
3Sum is its eigenwert, can offset the influence of the fluctuation of pouring temperature to mechanical property preferably like this, and simultaneously again owing to realized microcomputerization, thereby precision is higher, and the error at measurment of its tensile strength and hardness can be less than ± 7%.
(KB+ τ
3) this eigenwert can overcome effectively because the fluctuation of pouring temperature and harmful effect that the mensuration of mechanical property is brought.
Description
Iron machine performance rapid test method and device thereof are the tensile strength sigma that is used at the real-time prediction cast iron of casting process
bWith hardness HB, it is the method that a kind of eigenwert by thermal analysis curve and differential analysis curve is forecast the iron machine performance.Polish scholar S.Jura had once delivered the paper of a piece " differential analysis of cast iron solidified process " by name in the 46th international casting annual meeting in 1979, the tensile strength and the hardness of cast iron have been forecast first with the eigenwert of thermal analysis curve and differential analysis curve, he is with (liquidus temperature on the thermal analysis curve), maximum cooling velocity after primary crystal changes on the KB(differential analysis curve) and three amounts such as β (the differential analysis curve of eutectic section is with respect to the inclination angle of time coordinate) be used as the eigenwert of its regression curve, the regression equation between its iron machine performance and the eigenwert is:
σ
b＝a
1+b
1T
L+c
1β+d
1（KB）
2
HB＝a
2+b
2T
L+c
2β+d
2KB
Wherein, a
1, b
1, c
1, d
1, a
2, b
2, c
2And d
2Be constant term, can do suitable adjustment according to the starting material of cast iron and the variation of smelting technology.The regression equation that this author proposes is:
σ
b＝-552.6+4.95×10
-4T
2 L+8.4β-0.16（KB）
2
HB＝-1105.2+1.14T
L-1.32β-1.15KB
Its corresponding determinator is to be made up of, thermopair, ratio-differentiator, registering instrument and stabilized voltage supply, and figure sees Fig. 1.The rationale of this differential analysis rapid test method is: in the technological parameter and pouring temperature one timing of sample, owing to figure mutually and the liquid phase ratio change under the condition of the thermal capacity variation that causes, the pace of change of specimen temperature (being cooling velocity) can directly reflect the casting solidification rate variations, and the casting solidification rate variations can reflect the forming core and the growing state of alloy structure and determining to solidify after metallographic structure.Therefore, some time parameters of rate of temperature change on the differential analysis curve and taking-up thus can further describe alloy organizing and corresponding therewith mechanical property.Wherein, eigenwert T
LBe to have reflected the influence of chemical analysis to mechanical property, KB has then reflected the influence of the pace of change of specimen temperature to mechanical property.Its major defect of above-mentioned regression equation that Polish scholar S.Jura proposed is: it does not reflect the influence of the fluctuation of pouring temperature to KB, KB was not constant just when the molten iron of same composition fluctuateed when pouring temperature: when pouring temperature is high, cooling velocity is slower, and the KB value is just little; Otherwise the KB value is just big; It is not enough to add the measurement mechanism precision, and its error can fail to be used for to produce up to about 10% always.Feature of the present invention is: with eigenwert (KB+ τ
3) replace KB, wherein τ
3Be meant: eutectic transformation began to the time interval between the eutectic transformation peak dot on the differential analysis curve.Pouring temperature is to τ
3Influence just opposite to the influence of KB with it: eutectic transformation time lengthening when pouring temperature is high, τ
3Be worth more greatly, otherwise just littler.Thereby employing (KB+ τ
3) make eigenwert and can offset the pouring temperature fluctuation influence to cooling velocity, the regression equation between its eigenwert and the mechanical property is as follows:
σ
b＝a
′ 1+b
1′T
L+c
′ 1（KB+τ
3）
HB＝a
′ 2+b
′ 2（KB+τ
3）
Wherein, a
1', b
1', c
' 1, a
2', b
' 2And c
' 2Be constant term, can make suitable accent according to the variation of the starting material of cast iron and smelting technology and pause.In addition, device block diagram of the present invention is seen shown in Figure 2.Be characterized in: it is a microcomputerization.After amplifier had received the signal that thermopair comes, its output was just delivered in one 12 the A/D converter by a negative pressure cut-off circuit, delivers in the microcomputer after being changed by the latter again and goes.In addition, for cold junction compensation and the zero shift that solves thermopair, between thermopair and amplifier, sealed in a compensating circuit again.Amplifier adopts automatic balancing circuit.Owing to have above characteristics, the error at measurment of employing this method and device back mechanical property can be less than 7%.
Embodiment:
The used device of this method is seen Fig. 2.Wherein,
Sample cup: be of a size of 35 * 35 * 70mm.Middle placement diameter is 3mm, and wall thickness is the quartz protecting tube of 0.5mm.
Thermopair: the high precision nickel chromium-nickel silicon thermocouple is placed in the quartz protecting tube.Its long-term serviceability temperature of thermopair is 1000 ℃, and the short-term serviceability temperature can reach 1300 ℃.In order to protect temperature measurement accuracy, adopt high frequency thristor to swash the welding of arc 77-1 type argon shield thermopair welding machine.
Amplifier: adopt cheap 791c, 7910 amplifiers and 3DJ7F field effect transistor have been formed two-stage serial connection amplifier, on circuit knot machine, adopt the form of binary channels chopper-stabilized DC amplifier, its actual enlargement factor is 500 times, the normal temperature drift of whole amplifier was less than 20 μ v/12 hours, and the linearity is better than 0.02%.
12 A/D converter negative pressure all are general circuit by reaching compensating circuit.
Main frame: select the TP801 single card microcomputer for use.
Experimental technique
1, asks tensile strength sigma
bWith liquidus temperature T
L(τ
3+ KB) regression equation:
By a large amount of experiments, make σ respectively
bWith T
L, σ
bWith (KB+ τ
3) scatter diagram, again to experimental data carry out one-variable linear regression with analyse, find out σ respectively
bWith T
L, σ
bWith (KB+ τ
3) the simple regression equation.But consider T
LWith (KB+ τ
3) be to σ from two different angles of chemical analysis and cooling velocity
bExert an influence, carry out binary linear regression, draw its last regression equation and be so go up to need these two eigenwerts are put together:
σ
b＝-111.9042+0.1041T
L+0.1699（KB+τ
3）
2, ask hardness HB and T
L(KB+ τ
3) regression equation:
By step same as described above and method, can obtain its last regression equation and be
HB＝-495.8962+0.5884T
L+0.2104（KB+τ
3）
More than used eigenwert T
L, KB and τ
3All be by a large amount of experiments, draw that its curve map is seen Fig. 3 from heat analysis and differential analysis curve.
Last error analysis please be shown in Table 1, with the HB relative error generally below 7%.
Description of drawings
Fig. 1, differential measurement device block scheme
The 1-thermopair;
The 2-proportional parts;
3-differential part;
The 4-recording section;
The 5-stabilized voltage supply.
Fig. 2, WRZ-1 type mechanical property fast measuring instrument block scheme
1-sample cup;
The 2-thermopair;
The 3-amplifier;
The 4-A/D converter;
The 5-TP801 single card microcomputer;
6-exports demonstration;
The 7-output print;
The 8-magnetic tape station;
The scanning of 9-two-way.
The heat analysis of Fig. 3, casting pig and differential analysis curve
T
L-liquidus temperature (G);
Maximum cooling velocity (G/ second) after the KB-primary crystal changes;
τ
3On-differential analysis the curve, eutectic transformation began to the time interval (second) between the eutectic transformation peak dot;
Table 1-σ
bTest data table with the calculating relative error of HB.
The numbering of the casting pig of numbering-various different components;
The iron machine performance fast measuring device that WRZ-1 type-the present invention proposes;
σ
b(puller system)-be the σ that on puller system, records
bValue;
The HB(sclerometer)-be the HB value that on sclerometer, records.
Continuous table 1,
Numbering HB(WRZ-1 type) relative error (%) HB(sclerometer)
1-1 251 269 6.7
1-2 258 257 0.4
1-3 250 253 12
1-4 256 266 3.8
1-5 253 246 2.8
1-6 255 246 3.7
1-7 252 244 3.2
2-1 212 211 0.5
2-2 216 215 0.5
2-3 225 230 2.6
2-4 236 236 0.0
2-5 241 236 2.1
2-6 241 232 3.9
2-7 243 253 4.0
2-8 235 231 1.7
2-9 240 252 4.8
3-1 241 239 0.8
3-2 240 257 6.6
3-3 239 234 2.1
3-4 237 239 0.8
Table 1, with the test data table of the calculating relative error of HB
Numbering σ
b(WRZ-1 type) N/mm
2σ
b(puller system) N/mm
2Relative error (%)
1-1 373.97 372.5 0.4
1-2 382.49 386.81 1.1
1-3 365.72 354.47 0.7
1-4 363.48 362.11 0.3
1-5 351.62 334.18 6.5
1-6 359.46 347.70 3.7
1-7 348.59 343.20 0.15
2-1 252.74 259.99 2.7
2-2 263.03 280.67 6.3
2-3 304.00 302.72 0.4
2-4 332.32 316.44 5.0
2-5 335.94 321.83 4.4
2-6 340.84 345.74 1.4
2-7 349.27 353.49 1.2
2-8 320.26 319.97 0.1
2-9 340.45 352.02 3.2
3-1 332.91 319.68 4.1
3-2 337.71 342.31 1.3
3-3 325.07 314.09 3.5
3-4 324.58 304.39 6.6
List of references
1. the differential analysis of cast iron solidified process
Poland S.Jura " the 46th international casting nd Annual Meeting collection in 1979 ".1979。
Claims (2)
1, iron machine performance rapid test method and device thereof are to be used at casting process in real time the tensile strength sigma b of prediction cast iron and hardness HB, it is the method that a kind of eigenwert by thermal analysis curve and differential analysis curve is forecast cast iron, generally is with T at present
LThree amounts such as (liquidus temperature on the thermal analysis curve), KB (the maximum cooling velocity after primary crystal changes on the differential analysis curve) and β (the differential analysis curve of eutectic section is with respect to the inclination angle of time coordinate) are as the eigenwert of regression curve, for casting pig, regression equation is:
σb=a
1+b
1T
L+c
1β+d
1KB
HB=a
2+b
2T
L+c
2β+d
2KB
Wherein, a
1, b
1, c
1, d
1, a
2, b
2, c
2, d
2Be constant term.
The invention is characterized in that it is with T
L(KB+ τ
3) return as eigenwert, corresponding regression equation is between eigenwert and the mechanicalness:
σb=a
1′+b
1′T
L+c
1′(KB+τ
3)
HB=a
2′+b
2′T
L+c
2′(KB+τ
3)
Wherein, τ
3For eutectic transformation on the differential analysis curve begins to the peak-to-peak time interval of eutectic transformation, a
1', b
1', c
1', a
2', b
2' and c
2' be constant term, can do suitable adjustment according to the starting material of cast iron and the variation of smelting technology.
2, said iron machine performance fast measuring device is by thermopair in the claim 1, and ratio one differentiator, register and stabilized voltage supply connection form.
The invention is characterized in that it is a microcomputerization, and the output of amplifier delivers to one 12 A/D converter by a negative pressure cut-off circuit, go by being input in the microprocessor after latter's conversion again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86107807 CN1012388B (en) | 1986-11-13 | 1986-11-13 | Method for rapidly measuring mechanical property of cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86107807 CN1012388B (en) | 1986-11-13 | 1986-11-13 | Method for rapidly measuring mechanical property of cast iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86107807A true CN86107807A (en) | 1988-05-25 |
| CN1012388B CN1012388B (en) | 1991-04-17 |
Family
ID=4803683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86107807 Expired CN1012388B (en) | 1986-11-13 | 1986-11-13 | Method for rapidly measuring mechanical property of cast iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1012388B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104049069A (en) * | 2014-06-13 | 2014-09-17 | 清华大学 | Furnace-front quick evaluation method of structure and performance of gray cast iron |
| CN105548242A (en) * | 2016-01-18 | 2016-05-04 | 苏锦琪 | Method and device for measuring content of carbon and chromium in chromium-containing molten white cast iron by thermal analysis method |
-
1986
- 1986-11-13 CN CN 86107807 patent/CN1012388B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104049069A (en) * | 2014-06-13 | 2014-09-17 | 清华大学 | Furnace-front quick evaluation method of structure and performance of gray cast iron |
| CN105548242A (en) * | 2016-01-18 | 2016-05-04 | 苏锦琪 | Method and device for measuring content of carbon and chromium in chromium-containing molten white cast iron by thermal analysis method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1012388B (en) | 1991-04-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Yasuda et al. | Direct observation of stray crystal formation in unidirectional solidification of Sn–Bi alloy by X-ray imaging | |
| Lee et al. | Evolution of Ag3Sn intermetallic compounds during solidification of eutectic Sn–3.5 Ag solder | |
| CN101308077A (en) | Apparatus and method for measuring middle and low-temperature smelt surface tension, density and wettability | |
| Zeng et al. | Solidification of Sn-0.7 Cu-0.15 Zn solder: in situ observation | |
| CN86107807A (en) | Iron machine performance rapid test method and device thereof | |
| Zhou et al. | Research progress on bonding wire for microelectronic packaging | |
| Huang et al. | Size effects on the interfacial reaction and microstructural evolution of Sn-ball/Sn3. 0Ag0. 5Cu-paste/Cu joints in board-level hybrid BGA interconnection at critical reflowing temperature | |
| CN1211178C (en) | System and method for reducing welding program error for IC welding machine | |
| CN105115860A (en) | Synchrotron radiation imaging-based visual alloy melt interdiffusion measuring method | |
| Kanda et al. | The absolute viscosity of some Lead-Tin alloys | |
| Gao et al. | Joining of silicon particle-reinforced aluminum matrix composites to kovar alloys using active melt-spun ribbons in vacuum conditions | |
| JPS63239181A (en) | Method for measuring diameter of crystal in cz furnace | |
| JP2993660B2 (en) | Bonding wire | |
| Fornaro et al. | Microstructure development during directional solidification of Sn–Ag–Cu ternary alloys | |
| US20100000303A1 (en) | Apparatus and method for determining the percentage of carbon equivalent, carbon and silicon in liquid ferrous metal | |
| Zhao et al. | Effects of rapid solidification process and 0.1 wt.% Pr addition on properties of Sn-9Zn alloy and Cu/solder/Cu joints | |
| Petrescu | Liquid State Atomic Mobility of Silicon in the Unmodified Eutectie Silumin | |
| Jeffery | The lead-tin system of alloys re-examined by an electrical resistance method | |
| Hayashi et al. | Surface tension of the nickel-based superalloy CMSX-4 | |
| Shen et al. | The effects of third alloying elements on the bulk Ag 3 Sn formation in slowly cooled Sn–3.5 Ag lead-free solder | |
| CN1233886C (en) | Single crystal growing furnace three-dimensional thermal field distributing automatic testing system and method thereof | |
| CN113447389B (en) | Method for determining activation energy of carbon steel solidification process by nonlinear equal conversion rate method | |
| Dyakova et al. | Rapidly Solidified Al-Cu-Mg Amorphous and Nanocristalline Alloys | |
| Zhang et al. | Wettability optimization analysis of lead-free solders with Taguchi method | |
| Broderick et al. | An X-ray Study of the Alloys of Silver with Bismuth, Antimony and Arsenic. I |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| C14 | Grant of patent or utility model | ||
| C19 | Lapse of patent right due to non-payment of the annual fee |