This standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of steel bar cold rolling and twisting units. This standard is applicable to steel bar cold rolling and twisting units with cold processing and raw materials of low carbon steel hot rolled round wire rods. JG/T 3058-1999 Steel bar cold rolling and twisting unit JG/T3058-1999 Standard download decompression password: www.bzxz.net

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Construction Industry Standard of the People's Republic of China JG/T3058—1999
Cold-rolled and twisted bars unit
Cold-rolled and twisted bars unit Construction Standard
1999-06-08 Issued
1999-12-01 Implementation
Issued by the Ministry of Construction of the People's Republic of China
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JG/T3058—1999
This standard is compiled based on the product standard JG3046—1998 "Cold-rolled and twisted bars" and with reference to the practical experience of domestic cold-rolled and twisted bars unit manufacturers. This standard is proposed by the Standard and Quota Research Institute of the Ministry of Construction. This standard is under the jurisdiction of Beijing Construction Machinery Comprehensive Research Institute, the technical unit responsible for construction machinery and vehicle standards of the Ministry of Construction.
The drafting units of this standard are Shenzhen Shengping Technology Co., Ltd., Jiaxing Zhenhua Machinery Manufacturing Co., Ltd., and Wuhan Metallurgical Equipment Manufacturing Co., Ltd. of Wuhan Iron and Steel Group. The main drafters of this standard are Dong Chongguang, Hu Yinhua, Wu Jiaxiong, Wang Mingxin, Lin Hongyu, and Jiang Zhidai.
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Construction Industry Standard of the People's Republic of China Cold-rolled and twisted bars unit
Cold-rolled and twisted bars unit Scope
JG/T3058—1999
The standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of cold-rolled and twisted bars units (hereinafter referred to as units). This standard applies to cold-rolled and twisted bars units with cold processing and raw materials of low-carbon steel hot-rolled round wire rods.
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 will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T4064—1983 Guidelines for safety design of electrical equipment GB/T4879—1985 Rust-proof packaging
GB.5083—1999 General principles for safety and sanitation design of production equipment JG3046—1998 Cold-rolled twisted steel bars
JG/T5011.1—1992 General technical conditions for steel castings for construction machinery and equipment JG/T5011.4—1992
General
Technical conditions for grey iron castings for construction machinery and equipment
General technical conditions for forgings for construction machinery and equipment JG/T5011.8—1992
Approved by the Ministry of Construction of the People's Republic of China on 1999-06-08 Engineering Construction Standard Full Text Information System
Implementation on 1999-12-01
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JG/T5011.10—1992
Construction Machinery and Equipment
Technical Conditions
JG/T5011.11—1992
General Technical Conditions for Cutting Parts
Construction Machinery and Equipment
General Technical Conditions for Assembly
JG/T5011.12—1992
General Technical Conditions for Painting of Construction Machinery and EquipmentJG/T5012—1992General Technical Conditions for Packaging of Construction Machinery and EquipmentJG/T5082.1—1996General Technical Conditions for Welded Parts of Construction Machinery and EquipmentJBJ23—1996General Specification for Construction and Acceptance of Mechanical Equipment Installation ProjectYB9249—1993Specification for Construction and Acceptance of Metallurgical Machinery and Equipment Installation ProjectDefinitions
This standard adopts the following definitions.
3.1 Cold-rolled and twisted bars Cold-rolled and twisted bars are hot-rolled low-carbon steel bars that are straightened, cold-rolled and cold-twisted in one step by a special cold-rolling and twisting machine to form a continuous spiral steel bar with a specified cross-sectional shape and pitch. 3.2
Cold-rolled and twisted bars unit A steel reinforcement machine that can continuously process cold-rolled and twisted steel bars and automatically cut them to the specified length. 3.3
continuous
The phenomenon of continuous cutting that is not in accordance with the specified length size due to the loss of control of the steel bar cutting machine's sizing device or cutting mechanism.
Rate of continuous shear
The number of continuous cutting phenomena that occurs for every 100 steel bars cut to the specified length size. Steel pile-up
The phenomenon of the rolled or flattened and twisted steel bars piling up between the rollers and the twisting device or the twisting device and the cutter.
4 Classification
4.1 Type
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According to the cold rolling mill roll support method, it is divided into cantilever type and arch type. 4.2 Main parameters
The main parameters of the unit are the raw material steel bar diameter: 5.5, 6.5, 8, 10, 12, 14mm. 4.3 Model and marking
4.3.1 The model of the unit consists of the name code, characteristic code, main parameter code and modification serial number:
Update, modification serial number: Indicated by uppercase printed Chinese phonetic letters (A, B, G.)
Main parameter code: Raw materials processed by the unit
The maximum nominal diameter of the steel bar m
Unit characteristic code: B Cantilever type:
P Arch type
4.3.2 Marking example
The maximum nominal diameter of the raw material steel bar processed is 10m, the first modified cantilever steel bar cold rolling and twisting unit:
Steel bar cold rolling and twisting unit GUB10AJG/T3058-1999 The maximum nominal diameter of the raw material steel bar processed is 14mm, arch type steel bar cold rolling and twisting unit|| tt||Rebar cold rolling and twisting unit GUP14JG/T3058—19994.4
Basic parameters
The basic parameters of the unit shall comply with the provisions of Table 13
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Raw material steel bar diameter
Roller linear speed
Table 1 Basic parameters of the unit
Cold rolling mill opening adjustment range
Fixed length cutting length range
5 Technical requirements
General requirements
Cantilever type
Arch type
5.1.1 The unit shall include basic equipment such as pay-off stand, straightening machine, cold rolling mill, twisting device, cutting machine, blanking rack, and cooling, lubrication and electrical supporting systems. 5.1.2 The unit is suitable for altitudes not exceeding 3700m; the ambient temperature is -15~+40℃. The required power supply is three-phase AC power supply, 50H, 380V, and the allowable voltage fluctuation range is ±10% of the rated voltage.
The installation of the equipment shall comply with the requirements of JBJ23. The quality and performance indicators of the processed cold-rolled twisted steel bars shall comply with the relevant provisions of JG3046.
Performance of the whole machine
5.2.1 The friction parts of the moving parts shall be able to ensure normal lubrication. The rollers and twisting rollers shall be reliably cooled during operation, and the cooling medium shall ensure that it does not affect the bonding performance between the steel bars and concrete.
5.2.2 The unit is not in a positive belt
The load noise of the cold rolling mill shall not be greater than 85dB(A), excluding the instantaneous noise of the cutting machine cutting or falling.
The difference in the diameter of the paired rollers shall not be greater than 0.05mm. The power consumption of the unit for processing one ton of cold-rolled twisted steel bars should not be greater than 40kW·h. The number of steel stacking times for processing one ton of cold-rolled twisted steel bars should not be greater than 3 times. The continuous cutting rate of the cutting machine should not be greater than 3%.
Unit reliability index:
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a) The reliability index of the unit within 240 hours of working time should not be less than 85%; b) The working time before the first failure of the unit should not be less than 120 hours; c) The average trouble-free working time of the unit should not be less than 100 hours. 5.2.9 The deviation of the fixed-length cutting should be ±10mm. 5.2.10 After the whole machine is assembled, it should be operated in a linked idle manner, and all its operating parts and systems should work normally, reliably and safely. 5.3 Main parts and systems of the unit
5.3.1 Pay-off stand
The pay-off stand should be stable, safe, easy to use, and able to ensure continuous feeding. 5.3.2 Straightening machine
A straightening machine should have the functions of straightening, derusting and adjusting the tension of raw steel bars. 5.3.3 Cold rolling mill
a) The rollers of the cold rolling mill should have the function of adjusting the radial center distance of the rollers (i.e. the flattened thickness of the steel bars) and locking the center distance to keep it unchanged during the rolling process; b) Fast or slow rolling can be achieved through the speed change device; 3) The rollers or roller sleeves should be easy to disassemble and install; d) The coaxiality between the rolling center line of the rolling mill and the center line of the twisting device should not be greater than 0.5mmz
e) The main motor of the cold rolling mill should not be started directly, and a starting device, overload protection and short-circuit protection device should be provided;
f) Under normal lubrication, rated speed and load conditions, the bearing temperature rise after the cold rolling mill has been running for 3 hours should not be greater than 40℃
Twisting device
single) The twisting device should have the function of making the flattened steel bars twist regularly and continuously, and be easy to adjust to meet the requirements of the flattened thickness and pitch of steel bars of different specifications; b) The wearing parts of the twisting device should be easy to replace. 5.3.5 Cutting machine
The cutting machine should be able to ensure continuous production and avoid steel piling or pulling. The number of cuts (i.e. the number of steel bars) should be recorded automatically.
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5.3.6 Blanking rack
The blanking rack should have an automatic length control device and can be linked with the cutting machine to cut and blank.
5.3.7 Electrical system
a) The design of electrical equipment should comply with the relevant provisions of GB/T4064; b) The electrical system should be reliably grounded, and its grounding resistance should not be greater than 102; c) The electrical components and lines should be well insulated, and the insulation resistance to the ground should not be less than 1M
d) The line connection of the electrical system should be good, and the layout of instruments, switches and buttons should be reasonable for easy operation and observation.
5.4 Manufacturing requirements
5.4.1 The unit shall be manufactured in accordance with the design drawings and technical documents approved by the prescribed procedures. Cutting parts shall comply with the provisions of JG/T5011.10. 5.4.2
Welding parts shall comply with the provisions of JG/T5082.1. Castings shall comply with the provisions of JG/T5011.1 and JG/T5011.4. Forgings shall comply with the provisions of JG/T5011.8. Assembly parts shall comply with the provisions of JG/T5011.11. Painting shall comply with the provisions of JG/T 5011.12. The safety and sanitation of machinery and lubrication equipment shall comply with the relevant provisions of GB5083. The materials of important parts and the surface hardness after heat treatment should comply with Table 2. Table 2 Materials and surface hardness of important parts
Roller ring
Torsion strip
Wear-resistant guide nozzle
Cutting machine blade
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9CY2M6V, 9SIC, GCT15
9SiCr20CiMnTi
ZGMn13.GCr15
9SICr, 10Ti
Hardness HRC
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6 Test methods
Each test should be recorded in detail.
6.1 Test of rolled steel bar performance
The test method for the quality and performance of cold-rolled twisted steel bars rolled by the unit shall comply with the provisions of JG3046.
6.2 Dimension measurement
6.2.1 Measure the diameter of the rolling rolls with an outside diameter micrometer with an accuracy of 0.01mm. Measure the diameter of each roll at two mutually perpendicular points and take the arithmetic mean. 6.2.2 Measure the length of the steel bar with a steel tape measure with an accuracy of 1mm and a length greater than the cut-off length of the cold-rolled twisted steel bar to be measured
6.3 Coaxiality measurement
The measurement of the coaxiality between the rolling center of the roll and the center line of the twisting device shall comply with the relevant provisions of YB9249.
6.4 No-load test
First, start the straightening mechanism, cold rolling mill, cutting machine, blanking rack, cooling and lubrication system, electrical and operating system of the unit separately without load. Stop the machine when all parts are operating normally. Then, all mechanisms are linked to run at no-load. The no-load operation starts at low speed and then at high speed. The continuous operation time should not be less than 30 minutes. 6.4.2 After the unit runs stably at no-load, the linear speed of the cold rolling mill roll is measured. The speed of the roll is measured with a tachometer. Then, according to the measured roll speed and diameter, the linear speed of the roll is calculated according to formula (1):
= yuan Dn
center of the formula
-roller linear speed, m/min;
-measured roll speed, r/min;
-measured roll diameter, m.
6.5 Load test
6.5.1 The load test should be carried out after the no-load test is passed. (1)
6.5.2 According to the model of the unit, process the largest and smallest diameters of the raw materials respectively: 7
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Three of the longest and shortest types in the cutting range (i.e. two different specifications, two different lengths, a total of 12 pieces). And test the various technical indicators and product performance of the unit during load operation.
6.6 Unit noise test
6.6.1 The test instrument is an ordinary sound level meter (the error does not exceed ±2dB(A)) and a tape measure. 6.6.2 There is no vibration source and interference within 10m around the tested sample. No other personnel are allowed near the sound level meter except the measurer and the operator. 6.8.3 The sound level meter uses an A counting network and fast gear measurement. 6.6.4 Measure the noise of the sample during the cold rolling load stage (the noise during steel bar cutting and blanking is not included).
6.6.5 Test at four measuring points, front, rear, left and right, 1.5m horizontally around the cold rolling mill and 1.5m above the ground. The distance between the measuring point and large reflective objects (such as walls, etc.) should be greater than 1.5m. bzxz.net
First measure the background noise of the unstarted prototype, and then measure the operating noise of the prototype under load.
When the measured background noise is more than 10dB(A) lower than the operating noise, the actual measured value of the operating noise is the noise value of the unit. When the measured background noise is 6 to 10 dB(A) lower than the operating noise, the measured noise value in Table 3 should be subtracted The corresponding correction value is calculated after the noise value of the unit is obtained. Table 3 Correction value of operating noise
Difference between operating noise and background noise
Correction value
6.6. Each point is measured three times, and the arithmetic mean is taken as the operating noise value of the point. Delete the minimum point from the four-point measured and calculated results, and take the arithmetic mean of the remaining three points as the operating noise value of the unit.
6.7 Inspection of steel stacking times, continuous cutting rate and power consumption 6.7.1 Inspection of steel stacking times, continuous cutting rate and power consumption of the unit can be carried out by a dedicated person at the production site8
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is responsible for the implementation and allows cumulative calculation.
6.7.2 The number of steel piling and continuous cutting rate inspection is based on the prototype working for no less than 10 shifts (each shift is calculated as 6 hours of work), no less than two (including two) rolling specifications, the number of steel bars cut is greater than 200, and the actual output is calculated on average. The number of steel piling and continuous cutting rate. 6.7.3 The power consumption of the unit shall be measured using an independent special power meter. The cumulative working time of the unit is no less than 100h, the specifications of the rolled steel bars are no less than two, and the output is not less than 30t.
6.8 Unit manufacturing quality inspection
6.8.1 The unit manufacturing quality shall be calculated according to 5.4. 6.8.2 Use a 500V megohmmeter and a grounding meter to detect the insulation resistance and grounding of the unit.
6.9 Temperature rise test
Use a thermometer to detect the temperature rise of the cold rolling mill bearing. 6.10 Unit reliability test
6.10.1 The unit reliability test can be carried out at the production site under the supervision of a specialist under the prescribed conditions.
6.10.2 The unit reliability assessment test time shall not be less than 240h, and the average operating time per shift shall not be less than 6h.
6.10.3 The prototype used for the assessment test shall not be replaced during the test. Due to non-basic failures When the test is interrupted, it is allowed to replace the prototype and retest, but it shall not be accumulated. 6.10.4 The unit reliability assessment test only counts the basic faults that occur in the unit. Non-fundamental faults are counted as the latest faults but should be recorded in the fault registration table 6.10J5 Fault judgment
6.105.1 Faults caused by obvious external reasons or operators violating operating procedures and not using the equipment according to the prescribed conditions and derivative faults caused by basic faults are all non-fundamental faults.
6.10.5.2 Replacing wearing parts at the time specified in the unit manual is not considered a fault. However, records should be made and explained in the assessment test report. 6.10.6 Unit Failure Classification
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Unit failure classification shall be in accordance with the provisions of Table 4.
Table 4 Unit Failure Classification
Failure Category Failure Name
Fatal Failure
Serious Failure
General Failure
Failure Characteristics
Serious Endangerment or Causing Personal Injury
Failure Example
Failure Criticality Coefficient e
Personal Death Accident; Serious
Damage to the main equipment of the unit (such as cold
important components or main components are seriously damaged
rolling mill, cutting machine) and causing major economic losses
Seriously affect the function of the unit, the product is seriously unqualified and must be repaired in order, it is necessary to replace important external parts or disassemble the machine body to replace internal parts, the repair time exceeds 4 hours, the maintenance cost is high, and personal injury accidents; the main motor of the cold rolling mill is damaged, the cold rolling mill shaft is broken, and the beam column cracks obviously affect the main performance of the unit, the rolling mill bearing is damaged, and the cutting machine is cut or stopped. It must be stopped for maintenance. Generally, only cutting is required; except for the cold rolling mill, the external parts must be replaced or repaired. The fault time is less than 2h, and the maintenance cost is less than 2h. The motor damage, electrical appliance damage, switch damage, water supply, lubrication system damage, etc. will slightly affect the performance of the unit. It does not require poor electrical contact. The unit can be replaced or repaired by stopping or partially stopping the machine for a minor fault. The parts can be repaired by replacing or rotating the torsion roller damage (QD). The fault repair of the cold rolling mill can be repaired within 30min. 6.10.7 The working time before the first fault of the unit (MTTFF) The working time before the first fault of the unit is calculated according to formula (2). MIIFF = t
working time before the first fault, h. The mean trouble-free working time (MTBT) of the unit is calculated according to formula (3). MIBT
Where: t-
The cumulative working time of a unit, h,
The equivalent number of failures that occur in a unit within the specified reliability test time, its value is calculated according to formula (4).
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