Some standard content:
JB/T8583
This standard is formulated for the first time.
Appendix A of this standard is the appendix of the standard.
This standard is proposed and managed by the National Technical Committee for Casting Standardization. The responsible drafting units of this standard are: Shenyang Foundry Research Institute of the Ministry of Machinery Industry, Beijing Great Wall Foundry Group Co., Ltd., and Jinan Modeling Materials Factory. The participating drafting units of this standard are: Inner Mongolia Zhanrenlin Molding Sand Co., Ltd., Chaoyang Coated Sand Factory, Chongqing Changjiang Modeling Materials Company, Hebei Chengde Modeling Materials Company, Jiangsu Jintan Changjin Foundry Materials Factory, Hubei Guangshui Quartz Powder Factory, China FAW First Foundry, China First Tractor Engineering Machinery Company, Jinan Qianli Chemical Industry Corporation, Jiaxing Instrument Factory, etc. The main drafters of this standard are: Liu Yun, Liu Weihua, Lv Dezhi, Wang Yan, and Jin Guangming. 535
1 Scope
Machinery Industry Standard of the People's Republic of China
Coated Sand for Foundry
JB/T 8583:1997
This standard specifies the brand, technical requirements, test methods, inspection rules, packaging and transportation of coated sand for foundry. This standard is applicable to the production of coated sand for molds and cores using raw foundry sand and phenolic resin for shell molds (cores) as the main raw materials. 2 Cited Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB2684---1981 Test methods for raw sand and mixtures for casting GB9442-1988 Silica sand for casting
ZBG39005--1989 Phenolic resin for shell (core) of casting 3 Definitions
This standard adopts the following definitions.
3.1 Coated sand for casting
Molding sand and core sand with a layer of solid resin film on the surface of the sand grains before molding and core making. 3.2 Melting point
The temperature at which the phenolic resin film of the coated sand begins to melt under the action of heat and the sand grains are bonded together. 3.3 Flowability
The ability of the coated sand to fill the mold (core) box.
4 Grading and brand
The classification of coated sand for casting according to room temperature flexural strength is shown in Table 1. 4.1
Room temperature flexural strength
The classification of coated sand for casting according to ignition loss is shown in Table 2. Code
Loss on ignition
4.3 Brand
The brand of coated sand for casting is expressed as follows: 25
Approved by the Ministry of Machinery Industry of the People's Republic of China on June 20, 1997 536
Implemented on January 1, 1998
X-XX-XX
Example: FMS6-35-21Q
5 Technical requirements
5.1 Mandatory performance indicators
JB/T8583.-. 1997
Granularity grouping code of coated sand
-Grading code of loss on ignition
Grading code of flexural strength at room temperature
Coated sand for casting (the first letter of the Chinese pinyin of "覆、膜、沙") The performance indicators that must be measured for coated sand for casting are: flexural strength at temperature, hot flexural strength, ignition loss, particle size and melting point. 5.1.1 The flexural strength at room temperature of coated sand for casting shall comply with the provisions of Table 1. 5.1.2 The ignition loss of coated sand for casting shall comply with the provisions of Table 2. 5.1.3 The melting point of coated sand for casting is 96~105℃. 5.1.4 The hot flexural strength of coated sand for casting is 1.5~4.0MPa. 5.1.5 The particle size grouping of coated sand for casting shall be in accordance with the provisions of 4.2 in GB9442-88. 5.2 Selected performance indicators
5.2.1 The selected performance indicators of the coated sand for casting are: room temperature tensile strength, hot tensile strength, gas emission and fluidity. The test force method is recorded in A (Appendix of the standard).
5.2.2 If the purchaser has special requirements for the performance indicators in 5.2.1 and some special performance indicators (such as thermal deformation, disintegration, hardening speed, etc.), the supply and demand parties shall specify them in the order agreement. 6 Test methods
6.1 Normal bending strength
6.1.1 Instruments and tooling
SWY hydraulic strength testing machine
2S-6 sample preparation device and supporting support device (the distance between the two support points is 60mm) 6.1.2 Sample preparation
The size of the test sample of the room temperature bending strength of the coated sand for casting (Figure 1) is 22.36mm×11.18mm×70mm. 70
Figure 1 Bending strength test specimen
First heat the test specimen mold and the upper and lower heating plates to 232 (±5°C, then remove the upper heating plate, quickly pour the coated sand from the sand hopper into the mold cavity, and place the scraper blade perpendicular to the mold (parallel to the length direction of the mold). Scrape off the excess sand on the mold from the middle of the specimen to both sides twice, then press the upper heating plate, start timing, keep warm for 2 minutes, take out the sample, put it in a dry place to cool naturally to room temperature and measure it within 1 hour.
6-1.3 Determination method
×) In the above-mentioned particle size component, the amount of residue on the front sieve is greater than the amount of residue on the rear sieve, which is represented by Q, and vice versa, which is represented by I. 537
JB/T8583--1997
Place the bending test specimen on the fulcrum of the hydraulic strength testing machine. The smooth surface of the specimen should fall on the two supporting edges, and the loaded single edge should fall on the scraped surface of the specimen. The determination of the bending strength value of the specimen at room temperature shall be carried out in accordance with the provisions of 2.6.4 and 2.6.6 of GB2684·81. The bending strength value is 16 times the tensile scale value in the pressure gauge. 6.2 Hot bending strength
The instrument, tooling and specimen preparation for determining hot bending strength shall refer to the provisions of 6.1 of this standard. After preparing and taking out the specimen in accordance with the provisions of 6.1.2 of this standard, Rapidly load gradually on the hydraulic strength tester until the sample breaks. The time from taking out the sample to the completion of the test is required to be no more than 15$. Its hot bending strength value is 16 times the tensile scale value in the pressure gauge.
6.3 Loss on burning
6.3.1 Main instruments
High temperature box-type resistance furnace
Balance (sensitivity 0.001g)
6.3.2 Test method
First, bake the porcelain boat at 1000C for 30min and then place it in a dryer to cool to room temperature for use. Weigh 2g (accurate to 0.001g) of the coated sand sample to be tested in the baked porcelain boat, and then put it in the heated to 1 Burn in a high-temperature box-type resistance furnace at 000~~1050℃ for 30 minutes, take out the porcelain boat and place it in a dryer, weigh it again after cooling to room temperature, and multiply the weight loss by 50 to get the burning loss of the sample.
6.4 Melting point
6.4.1 Instrument
SJZ coated sand melting point tester
6.4.2 Test method
Perform according to the provisions of 6.5.3 in ZBG39005-89. 6.5 Particle sizewwW.bzxz.Net
The particle size of coated sand shall be determined according to the method specified in 2.3 of GB2684---81. 6.6 For the test methods of other performance indicators of coated sand for casting, see Appendix A . 7 Inspection rules
7.1 In order to inspect the quality of coated sand, the purchaser can select an average sample of the same batch of coated sand purchased from intact packaging, and the average sample of bagged coated sand can be selected from 1% of the same batch, but the minimum shall not be less than 3 bags, and the total weight shall not be less than 5kg. If there is any doubt about the quality of a certain part of the coated sand, it shall be sampled separately for testing. 7.2 Each batch of coated sand supplied by the supplier shall be inspected in accordance with the technical requirements specified in this standard, and the inspection results and brand shall be written in the quality certificate. The inspection method of coated sand shall be carried out in accordance with the provisions of Chapter 6 of this standard. The samples required for inspection shall be selected from the total sample by the "quartering method" or sample divider. The selected performance indicators specified in this standard or special performance requirements outside the provisions shall be determined by negotiation between the two parties. 7.3 The purchaser may conduct quality inspection of coated sand according to this standard. If any indicator in the inspection result does not meet the requirements of the standard, double sampling shall be conducted again in the same batch of products for re-inspection. If the re-test results still do not meet the requirements, the supply and demand parties shall negotiate to resolve the issue or entrust an arbitration unit to make a ruling. The arbitration unit shall be selected by both parties through negotiation.
8 Packaging, marking, transportation and storage
8.1 The packaging bags of coated sand for casting should be moisture-proof and easy to transport. 8.2 The packaging bags should be marked with:
a) "Coated sand";
b) Brand;
c) Manufacturer's name or trademark;
d) Weight,
e) Production date or batch number
JB/T8583—1997
8.3 The supplier must provide a product quality certificate for each batch of coated sand. 8.4 Rain protection measures should be taken during transportation, and the packaging must not be damaged or mixed with other debris. 8.5 The storage period shall be specified by the supply and demand parties in the order agreement. 8.6 The storage room should be ventilated, dry and moisture-proof. 539
A1 Tensile strength at room temperature
A1.1 Apparatus and tooling
JB/T8583
Appendix A
(Appendix to the standard)
Test methods for other performance indicators of coated sand for casting SWY hydraulic strength testing machine; ZS-6 sample preparation device. A1.2 Sample preparation
Test the tensile strength of coated sand for casting at room temperature with an "8"-shaped standard sample, see Figure A1. RI2
Figure A1 "8\-shaped tensile strength test specimen
The preparation of the test specimen for measuring tensile strength shall refer to the provisions in 6.1. The determination of the tensile strength value of the test specimen at room temperature shall be carried out in accordance with the provisions of 2.6.3 and 2.6.6 of (GB268!81). The measured value multiplied by 2 is the tensile strength of the test specimen at room temperature. A2 Hot tensile strength
The instrument and test specimen preparation for measuring hot tensile strength shall refer to the provisions in 6.1. Determination of hot tensile strength: Prepare the sample according to 6.1.2. After taking out the sample, quickly break it in the hydraulic strength testing machine 1. The time from taking out the sample to the completion of the measurement should not exceed 15s. The measured value multiplied by 2 is the measured hot tensile strength of the sample. A3 Gas Emission
A3.1 Instrument
SFI, type recording gas emission measuring instrument: balance (sensitivity 0.001g); porcelain boat. A3.2 Test method
First, measure the gas emission Heat the instrument to 850°C and keep the temperature constant. Then weigh 10.001g of sand ground from several parts of the film sand strength sample and place it in a porcelain boat (before use, the porcelain boat needs to be burned at 1000°C for 30 minutes and then placed in a dryer to cool to room temperature). Send the porcelain boat containing the film sand sample to the red-hot part of the quartz tube of the gas emission meter, and quickly seal the tube mouth with a cold iron. At the same time, the recording part of the gas emission meter starts to work and record the gas emission of the tested sample. After 3m inThe gas emission of the sample can be read directly from the recording paper. A4 Flowability
A4.1 Instrument
$6mm standard flow cup.
A4.2 Test method
Measurement is carried out by timing method. Take a 6mm standard flow cup and make the bottom hole of it cold by hand. Then fill it with coated sand and level it. Remove your finger and start timing with a stopwatch at the same time. The time until the sand flows out is the measured value of the flowability of the sand. The unit is seconds. 5.40
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