This standard specifies the test methods for SP and SL series extrusion equipment. This standard is applicable to SP and SL series extrusion equipment. This standard is used together with JB/T 6756.1. JB/T 6756.10-1993 Test methods for special equipment for wires and cables Part 10: SP and SL series extrusion equipment JB/T6756.10-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Special Equipment for Wires and Cables
Test Methods
Part 10 SP, SL Series Extrusion Equipment
Subject Content and Scope of Application
This standard specifies the test methods for SP, SL series plastic expansion equipment. This standard is applicable to SP, SL series extrusion equipment JB/T6756.1093
This standard is used together with JB/T6756.1 "Test Methods for Special Equipment for Wires and Cables Part 1 General Principles".
2 Reference standards
GB10095
Precision of involute cylindrical gears
JB/T5820 Technical requirements for plastic extrusion equipment for wires and cables JB/DQ8657 Product quality classification for special equipment for wires and cables JB/DQ8124 Basic technical requirements for cable equipment 3 Idle running performance test
3.1 Preparation before test
Before test, the equipment should be tested in accordance with the 3 provisions of JB/T6756.1. 3.2 Rotation steps and time of the operating mechanism
The operating mechanism of the equipment should start from the lowest speed and increase the knife height step by step. Generally, it should be operated at three speeds: low, medium and high. The operation time of each speed should not be less than 30 minutes, and the continuous idle operation time at the highest speed should not be less than 4 hours. 3.3 Speed ​​detection
The speed of each output shaft should be measured with a tachometer, which should meet the design requirements. 3.4 Temperature rise detection
Use a point thermometer to measure the temperature of each bearing cover and suspicious points of the gearbox and calculate the temperature rise. 3.5 Noise detection
Noise detection should comply with the provisions of Article 5.1 of JB/T6756.1 and be carried out at the highest speed. 3.6 Electromechanical safety protection device detection
Electromechanical safety protection device detection should comply with the provisions of Article 5.3 of JB/T6756.1. 4 Load operation performance test
After the equipment passes the idling test, it is adjusted and the load operation performance test is carried out under normal process conditions. 4.1 Main engine discharge test
a. Power on the main engine to increase the temperature and observe the working conditions of the instrument, temperature control system, and cooling system. b. Observe the plasticization of the plastic according to the process temperature. 4.2 Maximum extrusion volume detection Use the largest specification die, polyvinyl cyanide cable material for extrusion test (main machine without core wire) at the speed allowed by the process under the condition of stable extrusion process, use a stopwatch to time, run 60, cut the extruded plastic, weigh it with a scale, randomly sample a total of 5 tests, take the average value, calculate the maximum extrusion volume per hour, which should meet the requirements of JB/DQ8657.7 standard. Approved by the Ministry of Machinery Industry on August 21, 1993
1993-1001 implementation
4.3 Product specification detection
JB/T 6756.1093
From the production range specified by the equipment, select large, medium and small specifications as the processing objects, run at the maximum speed allowed, and perform extrusion operations. Each specification is not less than 1 full plate, and the outer diameter and eccentricity value after extrusion are measured with conventional measuring tools. 4.4 Reliability test
Under normal production conditions, the equipment can run continuously for 72 hours without any fault within the speed range specified by the equipment. 5 Precision test of main parts
5.1 Screw
a. Heat treatment of screw and measurement of wear-resistant layer thickness During the nitriding treatment of screw, there must be a furnace sample for each furnace. The nitriding hardness and nitriding depth of the screw are tested by a hardness tester and a metallographic microscope respectively.
b. The roughness of the working surface of the screw
Verify with a roughness sample and, if necessary, with a roughness measuring instrument. The radial full runout test of the screw outer diameter shall comply with the provisions of Figure 1 and Table 1. c
5.2 Barrel
Measurement of barrel heat treatment hardness and wear-resistant layer thickness a.
When barrel nitriding is performed, each furnace must have a furnace sample. The barrel nitriding hardness and nitriding depth are tested by a hardness tester and a metallographic microscope. The surface roughness of the barrel inner hole is checked by a roughness sample and, if necessary, by a roughness measuring instrument. The straightness of the barrel inner hole is measured by the indirect measurement method shown in Figure 2 and Table 2. c.
5.3 Gearbox
The axis parallelism test of each bearing hole of the box body shall comply with the provisions of Figure 3 and Table 3. a.
Gear accuracy test shall comply with the relevant provisions of GB10095. b.
6 Accuracy inspection of the whole machine
6.1 Screw and barrel assembly clearance measurement
Before assembly, use the outer diameter micrometer block gauge and the inner diameter dry gauge to measure the screw outer diameter and the inner hole size of the barrel respectively, and then calculate the difference.
6.2 Heating and temperature control stability inspection
Perform a power-on test on each electric heater of the whole machine, and use a thermocouple thermometer with an accuracy of 1% from 0 to 300℃ to measure the temperature of each zone. Use the measured temperature value to check the temperature correctness of the temperature control instrument, adjust the setting value of the temperature control instrument, and observe the automatic temperature control situation. 7 Electromechanical safety device inspection
7.1 The general safety protection inspection of the equipment shall comply with the provisions of Article 5.3 of JB/T6756.1. 7.2 Mainframe pressure protection test After the pressure sensor is assembled, adjust the pressure indicator to zero, and perform a load test during the equipment installation and commissioning, observe the pressure change of the pressure instrument, and adjust the set value. When the mainframe pressure reaches this value, the equipment should be able to alarm or stop running. 8 Appearance quality inspection
Equipment appearance quality inspection should comply with Article 5.2 of JB/T6756.1. 52
Tool carriage
Test items
Outer diameter of screw
Total runout
JB/DQ8657.7
Mobile platform
Testing tools
||Measuring frame with indicator
JB/T6756.10-93
Testing method
Test on a lathe or grinder that meets the precision standards 1. Test on a lathe As shown in Figure 1 ① The end of the workpiece to be tested is placed on the lathe jack and calibrated, and the other end is held with a pin. The measuring frame is fixed on the tool carriage, and the indicator contact touches the outer diameter of the screw. Slowly turn the lathe spindle, adjust the movement of the tool holder to match the lead of the screw, the difference between the maximum and minimum values ​​of the indicator is the total radial runout of the screw outer circle 2. Detection on the grinder (this is an approximate measurement method) As shown in Figure 1②, use a pin to support both ends, fix the measuring frame on the grinding head, and the indicator contact touches the outer diameter of the screw. Move the grinder workbench to record the maximum and minimum values ​​measured. Each time the screw rotates 30° for a total of 5 times (a total of 150°), measure and record the values ​​according to the above method. The difference between the maximum and minimum values ​​of the indicator is the total radial runout of the screw outer diameter
Testing items
Barrel inner hole straightness
JB5820
Table 2-2
Testing tools
1. Flat plate movement
2. Homemade special
3. Measuring frame with indicator
4. V-shaped support| |tt||Test items
Axis of each gearbox shaft
Parallelism
JB/DQ8657
Testing tools
1. Measuring stand with indicator
2. Three fixed and adjustable supports
JB/T6756.10—93
Testing method
Indirect measurement using special tools:bzxz.net
1. Place the barrel on two V-shaped supports on a flat plate, and use an indicator to calibrate the two ends of the barrel inner hole so that the axis is at the same height relative to the flat plate, as shown in ① in Figure 2. 2. Correct the machine cylinder so that the inner hole of the barrel is parallel to the moving direction of the moving platform. 3. Insert the self-made special tool into the inner hole of the machine cylinder as shown in the figure, so that the steel ball at the end of the tool always contacts the highest point B of the inner hole of the barrel, and the indicator contact contacts the measuring tool at point C. Slowly move the measuring tool, measure at no less than 5 places, and calculate the maximum reading difference of the indicator Mx, then the straightness error of the inner hole of the cylinder in the measured M
plane is f,AB
4. Rotate the cylinder 90°, measure and calculate f according to the above method,=5. The straightness error of the inner hole of the cylinder is:
f-(fx)*+(tfy)
Y(Mx)+(My)
Detection method
1. Place the gear box on three equal height bearings on the workbench of the observation bed. 2. The measuring frame is fixed on the main shaft of the mirror bed. The main shaft is rotated to calibrate any bearing hole on the gear box, and the center of the front and rear holes coincides with the center of the boring machine main shaft. 3. Move the workbench to align the second bearing hole with the main shaft of the bed. Measure in three axial sections that are 120° apart. The maximum value of half the difference in the indicator reading is taken as the parallelism error of the bearing hole:
(MM,)max
4. Check the parallelism error of the remaining bearing holes in turn. 5. Random testing is also possible.
Additional instructions:
JB/T6756.10-93
This standard was proposed and managed by Shanghai Cable Research Institute of the Ministry of Machinery Industry. This standard was drafted by Shanghai Electric Machinery Factory. The main drafters of this standard are An Zhendi and Zhang Yusheng. 55
People's Republic of China
Mechanical Industry Standards
Special Equipment for Wires and Cables
Testing Methods
JD/T6756.1~6756.10
Mechanical Standardization Research Institute of the Ministry of Machinery Industry
Edited, published and distributed by Standardization Research Office of the First Equipment Department of the Ministry of Machinery Industry
(No. 302, Xiashesi Street, Xiangtan City, Hunan Province)
Printed by Chaotan Electric Motor Factory Printing Factory
Format 880×12301/16 Printing Sheet 3mm Words 100 First Edition July 1994
July 1994-
Printing No. DB787
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