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ICS_65.060.80
National Standard of the People's Republic of China
GB/T 5856-1999
General specification of hot press
General specification of hot press1999-01-25Published
1999-08-01Implementation
Published by the State Administration of Quality and Technical Supervision
GB/T5856—1999bzxz.net
Referenced standards
Hot press parameters
Hot press plunger series
Hot press precision
Technical requirements
Test methods
Inspection rules
Standard This standard is based on the Japanese Industrial Standard JIS B6548-1986 "Test and Inspection Methods for Hot Presses" to revise GB/T5856-1986 "Precision of Hot Presses", GB/T5857-1986 "Technical Conditions for Manufacturing and Acceptance of Hot Presses", and GB/T1571-1988 "Parameters of Multilayer Hot Presses". After the revision, the three standards were merged, the precision and working precision of hot presses were changed to three levels, the tolerance value expression method was changed to numerical expression, the inspection items of the main components plungers and plunger cylinders were also greatly changed, the parameters were deleted as necessary, and the hot press plunger series was supplemented.
This standard replaces GB/T5856-1986, GB/T5857-1986 and GB/T1571-1988 from the date of implementation. This standard was proposed by the former Ministry of Forestry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Wood-Based Panel Machinery. Drafting units of this standard: Wood Industry Research Institute of China Academy of Forestry, Shenyang Heavy Machinery Factory. The main drafters of this standard: Ouyang Lin, Pu Chenghan, Wu Baoran, Qiu Ruiqiu. 1 Scope
National Standard of the People's Republic of China
General specification of hot press
General specification of hot pressGB/T5856-1999
Replaces GB/T5856~5857-1986
GB/T1571-1988
This standard specifies the general technical conditions of hot press, such as parameters, accuracy, technical requirements, test methods, inspection rules, etc. This standard applies to multi-layer hot presses for producing plywood, fiberboard, particleboard, veneer, etc. 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 will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. Tolerances and fits
GB/T1801--1979
Shape and position tolerances without tolerance values
GB/T1184—1996
GB/T2828--1987
Batch inspection counting sampling procedures and sampling tables (applicable to inspection of continuous batches) GB/T5226.1—1996
Industrial machinery and electrical equipment Part 1: General technical conditions GB/T7935—19 87
GB/T7932—1987
LY/T1359--1999
LY/T1376—1999
Hot press parameters
General technical conditions for hydraulic components
General technical conditions for pneumatic systems
General technical conditions for wood-based panel machinery
Painting colors for wood-based panel machinery
The size of the hot pressing plate and the total pressure of the hot press shall conform to the requirements of Table 1. Table 1 Hot press parameters
Fiberboard hot press
Medium density fiberboard
Approved by the State Administration of Quality and Technical Supervision on January 25, 1999 Length
Hot press size, mm
Total pressure, MN
Implementation on August 1, 1999
Particleboard hot press
Plywood hot press
Thermosetting resin decorative laminate hot press
Veneer hot press
Hot press plunger series
The outer diameter of the hot press plunger shall comply with the provisions of Table 2. GB/T5856—1999
Table 1 (end)
Dimensions of hot press, mm
Table 2 Outer diameter of hot press plunger
Outer diameter of plunger
Precision of hot press
Total pressure.MN
140,160,180,200,250.280,320,360.400,450.500,560,630,710,8005.1 The inspection items, inspection methods and tolerance values of accuracy and working accuracy are shown in Table 3. 5.2 When the measuring and checking tools specified in this standard are not available, other inspection methods are allowed to be used, but the inspection accuracy should not be lower than the accuracy of the inspection method specified in this standard.
Table 3 Precision of hot press machine
Test items
Flatness of hot press plate
Test method
Place the hot press plate on a flat plate, place a reflector on the surface to be tested, and adjust the autocollimator to be parallel to the surface to be tested.
Measure points as shown in the figure
Calculate the flatness error using the diagonal method or measure with an electronic
level.
Test diagram
Test items
Parallelism of hot press plate
Uniformity of hot press plate surface temperature
Uniformity of each hot press plate surface temperature
Surface roughness R of hot press plate
Test method
GB/T5856—1999
Table 3 (continued)
Test diagram
Place the hot press plate on the flat plate and measure the points as shown in the diagram. The difference between the maximum and minimum readings of the indicator is the measured value.
Heat the hot press plate with saturated steam at a pressure of 0.3MPa until the inlet and outlet temperatures remain stable. Use a digital thermometer to measure at the 9 points shown in the figure. The difference between the maximum and minimum readings of the thermometer is the measured value. Pressure is taken as 0.The hot platen is heated by 3MPa saturated steam. When there is no back pressure on the condensate valve, the temperature near the steam outlet of each hot platen is measured with a thermometer. The difference between the maximum and minimum readings of the thermometer is taken as the measured value. The surface roughness is measured with a touch-type surface roughness measuring instrument.
Inspection items
Opening between hot press plates
Uniformity
Flatness of movable crossbeam table
Flatness of fixed crossbeam table
Parallelism of movable crossbeam table to fixed crossbeam table
Inspection method
GB/T5856—1999
Table 3 (continued)
Inspection diagram
Let the hot press plate be in the initial position.
Use a vernier caliper to measure the four corners between the hot press plates.
Use the maximum difference between the reading value and the basic size as the measurement
For a hot press with a simultaneous closing mechanism
, measure the uniformity of the opening when the hot press
plates are in any position.
Use a vernier caliper to measure the four corners between the hot
plates, and use the difference between the maximum and minimum readings
as the measurement value.
Same as serial number 1
Same as serial number 1
Use two equal-height pillars
to support the two ends of the center line
under the movable crossbeam to keep it still. The indicator is placed on the
ruler||on the movable crossbeam table.
Measure the scene according to the diagram, and take the difference between the maximum and minimum readings of the indicator as the measured value.
Same as No. 1
Same as No. 1
Inspection items
Verticality of the moving track of the movable beam to the fixed beam table
Verticality of the column to the flat surface on the plunger cylinder
Inspection method
GB/T5856-1999
Table 3 (continued)
Inspection diagram
Place the angle ruler on the fixed beam table, and fix the indicator on the movable beam table. Make the movable beam reciprocate.
Measure according to the diagram.
The difference between the maximum and minimum readings of the indicator is the measured value.
Measure within the maximum working stroke length of the movable crossbeam. Place a straight ruler on the upper plane of the column cylinder and a frame level on the straight ruler. Place the frame level against the column busbar.
Measure according to the position shown in the figure.
The difference between the maximum and minimum readings of the frame level is the measured value.
Inspection Items
Pressure Thickness Uniformity
Inspection Method
GB/T5856—1999
Table 3 (End)
Inspection Diagram
On the hot press plate, place a strip of man-made board with a total area similar to the width of the hot press plate, and place a lead strip with a thickness slightly larger than that of the man-made board.
After applying pressure at the maximum working pressure, use a micrometer to measure the thickness of each point of the lead strip shown in the diagram. The difference between the maximum difference in thickness of the lead strip and the maximum difference in thickness of the man-made board before pressurization is the measured value. The inspection is carried out on the upper, middle and lower layers of the hot press plate. The untested layer
should be placed with the same artificial board as the hot press plate
radial surface.
1 The tolerance values of serial numbers 1, 2, 7, 8, 9, 10, and 11 in the table are for hot presses with a hot press plate length of 2650mm. The tolerance values of hot press plates of different lengths should be converted according to the tolerances in the table.
2 The tolerance values in the table are for hot presses with a maximum working stroke of 1.5m. For hot presses with different maximum working strokes, the tolerance values are converted in proportion to the tolerance values in the table.
3 The thickness difference of the strip artificial board should not be greater than 0.1mm. If the maximum thickness difference of the lead strip after pressurization is greater than the maximum thickness difference of the strip artificial board before pressurization; according to the tolerance requirements in the table, if it is less than, it is qualified. 6 Technical requirements
6.1 General requirements
6.1.1 The design, manufacture and acceptance of the hot press should comply with the provisions of this standard and LY/T1359. 6.1.2 The electrical, hydraulic, pneumatic and other components and other accessories of the hot press should have a certificate of conformity and be tested at the same time as the hot press. 6.1.3 The important parts and components such as the column, frame plate, hot press plate, plunger, plunger cylinder, movable beam, fixed beam, etc. should be stress-relieved after rough processing.
6.1.4 The important parts and components such as the column, frame plate, hot press plate, plunger, plunger cylinder, movable beam, fixed beam and pressure vessel should have a certificate of conformity.
6.1.5 The hot press must be equipped with a temperature display device for the heating medium. 6.1.6 The hot press should meet the safety technical requirements and should be equipped with overload protection, limit stop, pressure indication and safe operation devices. 6.1.7 The factory hot press should ensure completeness and be equipped with special tools, accessories and spare parts required for normal use and maintenance. 6.2 Quality of main parts and components
6.2.1 Column
6.2.1.1 After rough machining, flaw detection shall be carried out.
6.2.1.2 The straightness of the axis shall comply with the provisions of Grade 8 in Table B1 of GB/T1184-1996. 6.2.1.3 The thread joint surface shall be inspected by the color coating method, and the actual contact area shall not be less than 75% of the theoretical contact area6
GB/T5856—1999
6.2.1.4 The transition between the inner diameter of the thread and the fillet of the shoulder shall be smooth and round, and there shall be no knife marks or scratches. 6.2.1.5 Thread surface roughness R.3.2. 6.2.2 Frame plate, frame
6.2.2.1 The weld of the frame plate shall be flawed, and there shall be no defects such as leakage, slag inclusion, cracks, etc. 6.2.2.2 The verticality of the lower plane of the inner frame of the rack to the center line of the inner frame shall comply with the provisions of Class 8 in Table B3 of GB/T1184--1996. 6.2.2.3 The parallelism of the lower support surface of the rack and the lower plane of the inner frame to the upper plane of the inner frame shall comply with the provisions of Class 8 in Table B3 of GB/T1184--1996.
Flatness of rack plate 1000:2.
Surface roughness of the transition arc of the inner frame of the rack plate R.6.3μm. 6.2.2.5
6.2.3 Hot press plate
The welds of the welded hot press plate shall be inspected and shall not have defects such as leaking welding, slag inclusion, cracks, etc. 6.2.3.1
For the hot medium channel holes drilled at both ends, the axis offset of the holes at both ends shall not exceed 2mm. 6.2.3.2
The symmetry of the axis of the heat medium channel hole to the upper and lower planes shall not exceed 2mm. 6.2.3.3
The surface roughness R of the surrounding surface is 12.5uμm, and the verticality to the working plane is 0.4mm. 6.2.3.5
The heat medium channel hole should be cleaned of dirt and debris, and there should be no blockage. There should be no scratches, bruises, delamination and other defects on the working surface. Test the pressure with a pressure of 1.5 times the maximum working pressure of the heating medium, and maintain the pressure for 5 minutes without leakage. 6.2.3.6
6.2.4The working surface of the plunger
should be treated with wear resistance, and the surface hardness should not be less than HV450. 6.2.4.2
The radial full runout shall comply with the provisions of Grade 6 in Table B4 of GB/T1184-1996. The outer diameter dimension accuracy shall comply with the provisions of grade f8 in Table 1 of GB/T1801-1979. 6.2.4.4 The outer diameter surface roughness R.0.8μm. The outer diameter surface shall not have defects such as scratches, bumps and coating shedding. 6.2.4.5
6.2.5 Plunger cylinder
6.2.5.1 The end face total runout of the mounting plane to the axis of the bushing hole shall comply with the provisions of grade 6 in Table B4 of GB/T1184-1996. 6.2.5.2 The dimension accuracy and radial total runout of the inner hole matched with the plunger or bushing shall comply with the provisions of grade H7 in Table 2 of GB/T1801-1979 and grade 7 in Table B4 of GB/T1184-1996 respectively. 6.2.5.3 The inner hole surface roughness R,1.6μm matched with the plunger or bushing. 6.2.5.4 The surface roughness of the transition radius between the installation plane and the outer circle is R, 6.3μm. 6.2.5.5 Test the pressure at 1.25 times the maximum working pressure, and maintain the pressure for 5 minutes without leakage. 6.2.6 Movable crossbeam and fixed crossbeam
6.2.6.1 The parallelism of the installation plane to the working plane shall comply with the provisions of level 7 in Table B3 of GB/T1184-1996. 6.2.6.2 The roughness of the working plane R. 6.3μm. 6.2.6.3 The verticality of the surrounding installation plane to the working plane is 0.40mm. 6.3 Assembly quality
6.3.1 The parts and components of the hot press machine shall meet the quality requirements and be assembled in accordance with the assembly process regulations. Parts such as gaskets and sleeves not specified in the drawings shall not be installed.
6.3.2 The parallelism and flatness of the inner frame of the frame assembly and the bearing surfaces of each plunger cylinder shall comply with the provisions of level 9 in Table B3 and Table B1 of GB/T1184--1996 respectively.
6.3.3 The flatness of the plane on the inner frame of the rack assembly shall comply with the provisions of Grade 8 in Table B1 of GB/T1184-1996. 6.3.4 After the column nut is tightened to the supporting surface, use a 0.05mm feeler gauge for inspection. Only partial insertion of the feeler gauge is allowed. The insertion depth shall not exceed 20mm, and the cumulative length of the inserted part shall not exceed 10% of the detectable circumference. 6.4 Quality of electrical, hydraulic and pneumatic devices
6.4.1 The electrical technical requirements shall comply with the relevant provisions of GB/T5226.1. GB/T5856-1999
6.4.2 The technical requirements of hydraulic components shall comply with the relevant provisions of GB/T7935. 6.4.3 The technical requirements of pneumatic components shall comply with the relevant provisions of GB/T7932. 6.5 Painting
The paint color shall comply with the relevant provisions of LY/T1376. 7 Test method
7.1 Idle running test
After the overall assembly of the hot press is qualified, an idle running test shall be carried out. The plunger shall reciprocate continuously for at least 20 times. And the following items shall be inspected: a) The movement of each operating mechanism shall be smooth, coordinated and reliable; b) The movement of each plunger shall be flexible, smooth, without impact and creeping; c) The electrical, hydraulic, pneumatic, heating and other systems shall work normally and reliably, move flexibly, without jamming, collision or leakage; d) The fasteners shall not be loose.
7.2 Load test
7.2.1 The load test includes full load and overload test. The full load test shall not be less than 3 times. For the newly designed hot press, the overload test shall be carried out at 1.2 times of the maximum working pressure. The number of tests shall not be less than 2 times. During the load test, an artificial board similar to the radial surface of the hot press plate shall be placed between each hot press plate.
7.2.2 The load test shall inspect the following items: a) After the hot press is increased to the maximum working pressure and the pressure is maintained for 5 minutes, the pressure drop shall not exceed 5% of the maximum working pressure; b) All mechanisms shall be normal and reliable, and parts and components shall not have abnormal deformation and damage; c) There shall be no obvious shaking of the whole machine during the test, and the rigidity shall comply with relevant regulations. 7.3 Accuracy inspection
7.3.1 Before the accuracy inspection, the press shall be naturally leveled, and the vertical and horizontal levels shall not be greater than 1000:0.1. 7.3.2 The basic parameters, dimensions, types and specifications shall comply with the relevant standards and design regulations. 7.3.3 The accuracy shall comply with the provisions of Chapter 5 of this standard. 8 Inspection rules
Factory inspection
8.2 Before leaving the factory, each product must be inspected, and with the user's consent, it can be accepted by the user. 8.3 The inspection includes appearance quality, accuracy inspection, idle running test and load test. 8.4 For batch products, load tests shall be conducted by random sampling, and the sampling method shall be in accordance with GB/T2828. 8.5 Load tests can be conducted by users.
8.6 Type inspection
Type inspection shall be conducted for any of the following conditions: a) Trial design and evaluation of new products or conversion of old products; b) After formal production, the structure, materials and process of the products have undergone major changes; c) Production is resumed after a long period of suspension;
d) The national quality supervision agency proposes that type inspection is required. 9 Marking, packaging, transportation and storage
Should comply with the provisions of Chapter 12 of LY/T1359--1999. 8
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