CN105651467A - Detection method of sandbox sealing performance - Google Patents
Detection method of sandbox sealing performance Download PDFInfo
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- CN105651467A CN105651467A CN201610020334.4A CN201610020334A CN105651467A CN 105651467 A CN105651467 A CN 105651467A CN 201610020334 A CN201610020334 A CN 201610020334A CN 105651467 A CN105651467 A CN 105651467A
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- China
- Prior art keywords
- sandbox
- detection method
- described sandbox
- detection
- gas leakage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
Abstract
The invention provides a detection method of the sandbox sealing performance. A sandbox is sealed, then compressed air is fed into the sandbox so as to enable the sandbox to be in a positive pressure state, and then whether the sandbox leaks air is judged; and if yes, the sandbox is repaired and then detected again, and if not, the sandbox is determined to be qualified. According to the scheme, the sealing performance of the sandbox is dually ensured by a standard inspection flow and a standard inspection method, the vacuum degree of casting is further ensured, box crushing, winkling and air holes caused for insufficient sealing performance of the vacuum sandbox are effectively controlled, the detection method is reusable, the operation is flexible and simple, the cost is low, and the method is suitable for wide popularization.
Description
Technical field
The present invention relates to sealing propertytest technical field, particularly relate to the detection method of a kind of sandbox stopping property
Background technology
The cost utilizing vacuum full mold casting technology to produce foundry goods is only 20%��60% that sand mold casting technology produces casting cost, and progressively can carry out to numerous by letter, the batch production being widely used in cast iron, cast steel and non-ferrous casting, the technological transformation and the product innovation that are particularly suitable for middle-size and small-size factory are produced. Comprising the automobile casting of auto parts machinery and high precision high strength.
Vacuum full mold casting technology is a kind of advanced foundry engieering drawn the advantage of negative pressure casting on the basis of cavityless casting in modern age and grow up, external also known as negative-pressure los mould casting, it (is generally casting expandability polystyrene with porous plastics, i.e. EPS) make the model of single use, taking adhesive-free dry sand as molding material, plastic pattern is through being coated with coating and puts into sandbox after drying and adds sand ram-jolt, metal is poured into a mould under negative pressure and is solidified, thus the cavity after making metal replace plastic mold vaporization, premium casting needed for final formation, this technology has low cost, low labour intensity, the advantage of great surface quality and cleaning Foundry Production environment, it it is the revolutionary new technology that represent 21st century cast growth direction, moulding process and equipment is significantly simplify due to it, therefore its investment is only 70% to the 30% of ordinary sand casting mechanization production investment.
The vacuum tightness of negative pressure lost foam vacuum sand box on casting quality impact significantly, mainly shows as following problem:
(1) crush. The major cause of crush is caused to be that the vacuum tightness in sandbox is too low, height is uneven and vacuum tightness sharply decline etc. And one of reason causing sandbox negative-pressure vacuum degree deficiency has yarn net and bleed line blocking, causing ability of bleeding to reduce, vacuum tightness declines.
(2) elephant skin. When white mould (EPC module) contacts with high-temperature liquid metal stream stock, it is decomposed into gaseous state, liquid state, solid-state composition, when heat of high temperature, the white mould of the EPC of 46% decomposes and reaches gaseous state and solid-state, the white mould of the EPC of 54% just can be reached after casting complete and to decompose completely, and before vaporization, be present on the border of casting mold with the state of liquid phase. Liquid state being vaporized completely, it is necessary to have regular hour and enough temperature, these liquid EPC retes shrink by its own face tension force, form discontinuous fringe shape, Cockle Defect.The generation of this problem also because vacuum degree deficiency, suction too little caused by, cause not by the liquid object of EPC pitch shape by dope layer gap suction and pumping to, in molding sand, impelling generation elephant skin.
(3) pore. Pore is the cavity being distributed on cast(ing) surface or cross section. EPC Bai Moyin is decomposed into solid-state, liquid, gaseous substance by the heat effect of high-temperature liquid metal stream stock, a large amount of gas is not taken away by the bleed-off passage of sandbox by vacuum pump, or vacuum tightness is too little, vacuum tightness scarce capacity, causes gas hold-up to generate pore in foundry goods.
The object that negative-pressure los mould casting vacuumizes and effect: be molded after performing in vain, put into sandbox through coating oven dry and evenly add dry sand vibration ramming moulding by layer, by vacuum pump, air between sand grains in sandbox is taken away again, sand mold in the sandbox of sealing is made to have certain degree of packing, inside carries out casting mold cast under being in negative pressure state, accelerate exhaust velocity and strengthen free air delivery, reduce metal and apperance interface air pressure, accelerate the fltting speed in metal liquid stream stock forward position, improve the cavity filling ability of foundry goods, be conducive to reducing the carbon black defect of cast(ing) surface; Vacuumize the burning that can also suppress white mold materials, impel it to vaporize, environmental protect, reduce the pollution to air; Increase mobility, the plasticity of metal liquid stream stock, make the profile of foundry goods more clear.
And in the prior art, the ventilating pit of large-scale negative pressure lost foam vacuum sand box vacuumized part is all hide with the filter screen of thin layer, then fix with several screws. And when moulding is poured into a mould, owing to being subject to the long-time baking of high-temperature liquid metal and high temperature molding sand, filter screen is easy to damage, when vacuumizing, molding sand enters bleed-off passage result in blockage through the filter screen damaged like this, thus the vacuum tightness making sandbox declines, negative pressure is not enough, cause the crush of sandbox, elephant skin and pore.
Summary of the invention
The detection method of sandbox stopping property provided by the invention, for the defect existed in prior art, it is an object of the invention to provide a kind of method by utilizing pressure sandbox stopping property to be detected.
The present invention provides the detection method of a kind of sandbox stopping property, comprising:
Step 1: sealed by sandbox, then leads to pressurized air so that being barotropic state in sandbox in sandbox;
Step 2: the pressure change in record sandbox, to judge whether sandbox exists gas leakage; And
Step 3: if sandbox exists gas leakage, then sandbox is reprocessed and then return step 1; Otherwise judge that sandbox is qualified.
The detection method of the sandbox stopping property according to the present invention, also comprises the step that the type to sandbox judges before step 1,
Wherein, when judging that sandbox is brand-new sandbox, then perform step 1; When judging sandbox as operation sandbox, then perform detection of negative pressure step.
The detection method of the sandbox stopping property according to the present invention, detection of negative pressure step comprises:
Sub-step 1: sandbox is sealed and vacuumizes, so that in negative pressure state in sandbox;
Sub-step 2: the time that sandbox performs to vacuumize was compared with the standard pumpdown time, to judge whether sandbox exists gas leakage; And
Sub-step 3: if sandbox exists gas leakage, then mark Gas leak position and reprocessed by sandbox and then perform step 1; Otherwise judge that sandbox is qualified.
The detection method of the sandbox stopping property according to the present invention,
Step 1 is included in after sandbox seals further, leads to the pressurized air 10 minutes into 0.08MPa in sandbox;And
Step 2 and step 3 comprise observed pressure meter 3 minutes further, and every 0.5 minute record 1 pressure data, if the pressure range of decrease >=10%, then sandbox existence gas leakage in sandbox in 3 minutes, otherwise would judge that sandbox is qualified.
The detection method of the sandbox stopping property according to the present invention, sub-step 2 comprises further: when sandbox performs ratio >=1.1 in time and the standard pumpdown time vacuumized, then judge that sandbox exists gas leakage.
The detection method of the sandbox stopping property according to the present invention, repeats sub-step 2 at least twice.
The detection method of the sandbox stopping property according to the present invention, in the step performing also to comprise before step 1 outward appearance to sandbox and size is checked.
The detection method of the sandbox stopping property according to the present invention, also comprised the step of process screen cloth inspection before performing detection of negative pressure step.
The detection method of the sandbox stopping property according to the present invention, carries out moulding to qualified sandbox and then comes into operation.
The useful effect of the detection method of the sandbox stopping property of the present invention is:
The detection method of the sandbox stopping property of the present invention, by sandbox being carried out sealing and then leads to pressurized air in sandbox so that sandbox being barotropic state is to judge whether sandbox exists gas leakage, if there is gas leakage in sandbox, then sandbox is reprocessed and then detect, otherwise judge that sandbox is qualified. This scheme is with the stopping property of the inspection process of stdn and the method for inspection double shield sandbox of specification, and then ensure the vacuum tightness of cast, crush, elephant skin and the pore that effectively control causes because of vacuum sand box stopping property deficiency, this detection method is reusable, not only operate flexible, easy, and with low cost, be suitable for extensive popularization.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the embodiment of the detection method of the sandbox stopping property of the present invention;
Fig. 2 is the schematic flow sheet of another embodiment of the detection method of the sandbox stopping property of the present invention.
Fig. 3 is the structural representation of the detection device of the sandbox stopping property of the present invention;
Fig. 4 is the positive seal detection curve of the detection method of the sandbox stopping property of the present invention;
Fig. 5 is the negative-pressure sealing detection curve of the detection method of the sandbox stopping property of the present invention.
Embodiment
Fig. 1 is the schematic flow sheet of the embodiment of the detection method of sandbox 1 stopping property of the present invention. As shown in Figure 1, the detection method of sandbox 1 stopping property of the present embodiment can comprise step.
S1: step 1: sealed by sandbox 1, then leads to pressurized air so that being barotropic state in sandbox 1 in sandbox 1.
Specifically, sandbox 1 is gone to the detection station place on detection track 2, again by the vacuum butt hole 3 bottom sandbox 1 and hydraulic seal valve 4 abutting joint, top seal lid 5 and sandbox 1 are installed together, and use standard C type card 6 card dress firmly, after sandbox 1 is docked by the compressed air apertures covered via top seal with compressed air valve 7, in sandbox 1, lead to pressurized air so that sandbox 1 is barotropic state, to check.
S2: step 2: the pressure change in record sandbox 1, to judge whether sandbox 1 exists gas leakage.
Specifically, if the barotropic state led in the sandbox 1 of pressurized air changes, then there is gas leakage in sandbox 1, if the barotropic state led in the sandbox 1 of pressurized air does not change, then sandbox 1 does not exist gas leakage.
S3: step 3: if sandbox 1 exists gas leakage, then sandbox 1 is reprocessed and then return step 1;Otherwise judge that sandbox 1 is qualified.
Specifically, if there is gas leakage in sandbox 1, then reprocess with sandbox 1, after having reprocessed, again sandbox 1 is gone to the detection station place on detection track 2, again by the vacuum butt hole 3 bottom sandbox 1 and hydraulic seal valve 4 abutting joint, top seal lid 5 and sandbox 1 are installed together, and use standard C type card 6 card dress firmly, after sandbox 1 is docked by the compressed air apertures covered via top seal with compressed air valve 7, pressurized air is led to so that sandbox 1 is barotropic state, to check in sandbox 1.
The detection method of sandbox 1 stopping property of the present embodiment, by sandbox 1 being carried out sealing and then leads to pressurized air in sandbox 1 so that sandbox 1 being barotropic state is to judge whether sandbox 1 exists gas leakage, if there is gas leakage in sandbox 1, then sandbox 1 is reprocessed and then detected, otherwise judge that sandbox 1 is qualified. With the stopping property of the inspection process of stdn and the method for inspection double shield sandbox 1 of specification, and then ensure the vacuum tightness of cast, crush, elephant skin and the pore that effectively control causes because of vacuum sand box 1 stopping property deficiency, this detection method is reusable, not only operate flexible, easy, and with low cost, be suitable for extensive popularization.
The present invention shown in Fig. 1 sandbox 1 stopping property detection method embodiment basis on, the present invention specifically can also comprise following content.
Preferably, also comprise the step that the type to sandbox 1 judges before step 1,
Wherein, when judging sandbox 1 as brand-new sandbox 1, then perform step 1; When judging sandbox 1 as operation sandbox 1, then perform detection of negative pressure step.
Preferably, detection of negative pressure step comprises three sub-steps, wherein, sub-step 1) sandbox 1 is sealed and vacuumize, so that in negative pressure state in sandbox 1; Sub-step 2) time that sandbox 1 performs to vacuumize was compared with the standard pumpdown time, to judge whether sandbox 1 exists gas leakage; Sub-step 3) if sandbox 1 exists gas leakage, then Gas leak position is marked and sandbox 1 is reprocessed and then performs step 1; Otherwise judge that sandbox 1 is qualified.
Preferably, after step 1 is included in sandbox 1 sealing further, the pressurized air 10 minutes into 0.08MPa is led in sandbox 1, and step 2 and step 3 comprise observed pressure meter 3 minutes further, and every 0.5 minute record 1 pressure data, if the pressure range of decrease >=10% in sandbox 1 in 3 minutes, then there is gas leakage in sandbox 1, otherwise judges that sandbox 1 is qualified.
Preferably, sub-step 2 comprises further: when sandbox 1 performs ratio >=1.1 in time and the standard pumpdown time vacuumized, then judge that sandbox 1 exists gas leakage.
Preferably, sub-step 2 at least twice is repeated.
Preferably, in the step performing also to comprise before step 1 outward appearance to sandbox 1 and size is checked.
Preferably, before performing detection of negative pressure step, also comprise the step of process screen cloth inspection. Herein it is to be understood that the process screen cloth inspection referred to herein refers to by range estimation or visual observation, thus check sandbox screen cloth whether intact, without distortion, damaged etc. operation steps.
Preferably, qualified sandbox 1 is carried out moulding then to come into operation.
Fig. 2 is the schematic flow sheet of another embodiment of the detection method of sandbox 1 stopping property of the present invention. As shown in Figure 2, the detection method of sandbox 1 stopping property of the present embodiment comprises brand-new sandbox 1 and with in 1 liang, sandbox, brand-new sandbox 1 positive seal detection and based on vacuum sand box 1 pour into a mould front negative pressure inspection, find leakage pressure problem after check with positive seal again, with the stopping property of the inspection process of stdn and the method for inspection double shield sandbox 1 of specification, and then ensure the vacuum tightness of cast.
In the brand-new sandbox 1 of the present embodiment is submitted to and checked and accepted, first brand-new sandbox 1 is carried out structure detection, namely check outward appearance, size etc., if through passed examination, carry out positive seal detection, otherwise undertaken reprocessing by brand-new sandbox 1 and again propose inspection. Fig. 3 is the structural representation of the detection device of sandbox 1 stopping property of the present invention, as shown in Figure 3, sandbox 1 goes to the detection station place on detection track 2; Again by the vacuum butt hole 3 bottom sandbox 1 and hydraulic seal valve 4 abutting joint; Top seal lid 5 and sandbox 1 are installed together, and use standard C type card 6 card dress firmly; After sandbox 1 is docked by the compressed air apertures covered via top seal with compressed air valve 7, logical pressurized air observes pressure changing in case after its pressure-stabilisation for some time, i.e. positive seal detection. Fig. 4 is the positive seal detection curve of the detection method of sandbox 1 stopping property of the present invention, wherein, A is standard pressure curve, B and C is defective pressure curve, judge whether sandbox 1 leaks gas according to pressure history in case, and then judge that whether its stopping property is qualified. If the stopping property of brand-new sandbox 1 is qualified, then brand-new sandbox 1 is gone into operation, and at operation process resume, it is checked; If defective, reprocess.
In the sandbox of operation 1 of the present embodiment, after some cycles put into operation by sandbox 1, its stopping property can occur decay then to need again to check its stopping property. First, to going into operation, sandbox 1 carries out screen cloth checkout procedure, if qualified, then sandbox 1 of going into operation proceeds negative-pressure sealing inspection, if defective, then carries out reprocessing and procedure inspection after proceeding to go into operation. Fig. 5 is the negative-pressure sealing detection curve of the detection method of sandbox 1 stopping property of the present invention, and wherein, a is standard pressure curve, b and c is defective pressure curve. With brand-new sandbox 1 the difference is that, first the sandbox 1 put into operation should carry out negative-pressure sealing detection, namely, being gone to by sandbox 1 after moulding station 8 loads loose sand 9 to case mouth uses overlay film 10 to seal, sealing rear top surface paving loose sand 9 compacting, go to cast station, by vacuum butt hole bottom sandbox 13 and vacuum valve 11 abutting joint, start vacuumizes, self-evacuating vacuum starts namely to observe negative pressure curvilinear motion situation in case, if negative pressure curve is abnormal for occurring, then proves the gas leakage of 1, this sandbox, namely prove that this sandbox 1 is qualified, then qualified sandbox 1 is put into operation; If negative pressure curvilinear motion abnormal (such as Fig. 5), prove that this sandbox 1 leaks gas, the detection station gone to by this sandbox 1 on detection track carries out positive seal detection (with brand-new sandbox 1), if positive seal detection is qualified, put into operation, if defective, indicate sandbox 1 air leak position and reprocess. Defective sandbox 1 carries out positive seal detection again after reprocessing, go to moulding station and come into operation after qualified, if defective, continues to reprocess.
In the present embodiment, positive seal detection working method and judging criterion: 1) sandbox 1 seals and leads to into 0.08MPa pressurized air 10 minutes in backward sandbox 1; 2) observed pressure meter 3 minutes, and every 0.5 minute record 1 pressure data; 3) if the pressure range of decrease >=10% in sandbox 1 in 3 minutes, then there is gas leakage in sandbox 1, otherwise judges that sandbox 1 is qualified; 4) as sandbox 1 leaks gas, air leak position certification mark.
In the present embodiment, negative-pressure sealing detection working method and judging criterion: 1) sandbox 1 is sealed and vacuumize, so that in negative pressure state in sandbox 1;2) standard sandbox 1 vacuumizes negative pressure to the maximum time is T standard; 3) record single sandbox 1 to be evacuated to negative pressure maximum time T every time and survey; 4) time that sandbox 1 performs to vacuumize was compared with the standard pumpdown time, to judge whether sandbox 1 exists gas leakage, namely when T actual measurement/T standard >=1.1, illustrate that sandbox 1 leaks gas; 5) if sandbox 1 exists gas leakage, first detect the sealing condition of overlay film and rectify and improve, then repeat negative pressure inspection; 6) still obtain T actual measurement/T standard >=1.1 after again detecting, be then defined as sandbox 1 and leak gas; 7) mark this sandbox 1, and gone to malleation detection station and again detect, mark, reprocess.
Claims (9)
1. the detection method of a sandbox stopping property, it is characterised in that, comprising:
Step 1: sealed by sandbox, then leads to pressurized air so that being barotropic state in described sandbox in described sandbox;
Step 2: record the change of the pressure in described sandbox, to judge whether described sandbox exists gas leakage; And
Step 3: if described sandbox exists gas leakage, then described sandbox is reprocessed and then return described step 1; Otherwise judge that described sandbox is qualified.
2. detection method according to claim 1, it is characterised in that, before described step 1, also comprise the step that the type to described sandbox judges,
Wherein, when judging that described sandbox is brand-new sandbox, then perform described step 1; When judging described sandbox as operation sandbox, then perform detection of negative pressure step.
3. detection method according to claim 2, it is characterised in that, described detection of negative pressure step comprises:
Sub-step 1: described sandbox is sealed and vacuumizes, so that in negative pressure state in described sandbox;
Sub-step 2: the time vacuumized described in being performed by described sandbox compared with the standard pumpdown time, to judge whether described sandbox exists gas leakage; And
Sub-step 3: if described sandbox exists gas leakage, then Gas leak position is marked and described sandbox is reprocessed and then performs described step 1; Otherwise judge that described sandbox is qualified.
4. detection method according to claim 1, it is characterised in that,
Described step 1 is included in after described sandbox seals further, leads to the pressurized air 10 minutes into 0.08MPa in described sandbox; And
Described step 2 and step 3 comprise observed pressure meter 3 minutes further, and every 0.5 minute record 1 pressure data, if the pressure range of decrease >=10%, then described sandbox existence gas leakage in described sandbox in 3 minutes, otherwise would judge that described sandbox is qualified.
5. detection method according to claim 3, it is characterised in that, described sub-step 2 comprises further: when ratio >=1.1 in time of vacuumizing described in described sandbox performs and described standard pumpdown time, then judge that described sandbox exists gas leakage.
6. detection method according to claim 5, it is characterised in that, repeat described sub-step 2 at least twice.
7. detection method according to claim 1, it is characterised in that, in the step performing also to comprise before described step 1 outward appearance to described sandbox and size is checked.
8. detection method according to Claims 2 or 3, it is characterised in that, before performing described detection of negative pressure step, also comprise the step of process screen cloth inspection.
9. detection method according to any one of claim 1,3,4, it is characterised in that, qualified described sandbox is carried out moulding and then comes into operation.
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| CN201610020334.4A CN105651467A (en) | 2016-01-13 | 2016-01-13 | Detection method of sandbox sealing performance |
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| CN201610020334.4A CN105651467A (en) | 2016-01-13 | 2016-01-13 | Detection method of sandbox sealing performance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111238746A (en) * | 2020-02-18 | 2020-06-05 | 青岛海尔电冰箱有限公司 | Method, equipment and medium for detecting sealing performance of refrigerator |
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