1. Carefully read the sawing machine manual
Determine and master the type, specifications, working principle, technical parameters, application scope, adjustment and operation methods of the sawing machine.
2. Mechanical mechanism performance and accuracy inspection
a. Check the reducer: remove the belt cover, turn the input shaft of the reducer by hand, and feel the meshing state of the transmission gear train in the reducer. The idle stroke is too large or the meshing is too tight, and the scale is determined by the special inspector; Idling 1 Hours, listen to the noise of the reducer (no more than 75 decibels), irregular impact sound is a bad state; touch the housing of the reducer with your hand, feel the temperature (generally no more than 65 ℃), hot hands are a bad state. Check the tightening, connection, sealing, lubrication and other conditions of each part.
b. Use a dial indicator to detect the movement accuracy of the main and driven saw wheels: radial runout≦0.15mm; end face runout≦0.20mm.
c. Check the working status of the tensioning mechanism: to achieve flexible transmission of the screw and nut pair, and proper tension; the sliding block fits well in the sliding groove. (The sawing machine with a sawing capacity greater than or equal to 500 is not equipped with a screw nut, and a hydraulic cylinder is used to tension the saw band)
d. Check the accuracy of the moving and fixed jaws: ensure that the jaw working surface is perpendicular to the work surface, and the jaws are only allowed to tilt to the workpiece direction (inclination 0.30:200mm) and perpendicular to the longitudinal axis of the carriage (or saw blade falling track plane).
e. The front and rear positions of the saw band guide arm and the guide block are correct, and the working surfaces of the two guide blocks are the same.
f. A busbar of the feeding hemp roller is 0.5mm higher than the work surface and parallel to the work surface.
g. Others: The whole machine does not lack spare parts; each connection is tightly combined and firm; each adjustable mechanism has complete functions, convenient adjustment, and reliable self-locking; no-load or loaded operation, no resonance at low speed, no comparison at medium and high speeds Great shock.
h. Check the reliability and sensitivity of the fast-forward slide rule function.
i. The geometric accuracy and working accuracy should meet the terms specified in JB/T4318.3-2013 (Machinery Industry Standard—Horizontal Band Saw Machine).
3. Hydraulic electrical system inspection
a. The hydraulic components such as the motor, oil pump, solenoid valve, speed control valve, overflow valve and pressure gauge in the hydraulic station have a reasonable layout. The soft and hard pipelines are easy to disassemble and assemble. The pipeline joints and the combination of various components and the valve plate are well sealed. The noise is low.
b. The position of the lifting cylinder is correct, the highest point of lifting the saw frame should meet the cutting function parameters of the sawing machine, the saw frame falls to the end (electrical limit switch action), and the tooth tip connection of the saw belt is slightly lower than the sawing machine table; the rest is clamped The functions of the oil cylinder, feeding oil cylinder, and pressing oil cylinder are in place.
c. Adjust the pressure of the hydraulic system, start the hydraulic system, check the sealing condition of all components such as pumps, valves, valve plates, cylinders, tanks, pipelines, pipe joints, etc., and the coordination and sensitivity of functional actions.
d. Check the standardization of the wiring of the distribution box and the electrical operation box, the coordination and consistency with the sawing machine function, the protection (interference interlock) function of the saw wheel starting and clamping and feeding action, and check the sensitivity of each component.
e. The hydraulic system implements the new version of the standard GB/T23572, the general technical conditions of the hydraulic system.
f. The electrical system implements the new version of the standard GB/T24342, the experimental specification for the continuity of the protective grounding circuit.
GB/T24343, Insulation resistance test specification.
GB/T24344, Specification for withstand voltage test.
4. Sawing function inspection
a. The operation accuracy of saw wheel, guide arm, worktable and saw frame lifting:
b.Remove the guide arm and tension the saw band so that the saw back rests on the edge of the saw wheel. The band will not fall during operation and the edge of the saw wheel is not laborious (generally there is a 0.5-1.0mm gap between the saw back and the edge of the saw wheel. );
c. Install the guide arm, tension the saw band, only adjust the guide arm and guide block so that the saw band is perpendicular to the worktable surface and the fixed jaw surface (⊥0.10/100mm), while maintaining the “a” state.
d. The saw band lifting track surface is perpendicular to the table surface (⊥0.10/100mm).
e. The feeding table of the automatic sawing machine is 0.1-0.6mm lower than the working table in the entire feeding stroke, and parallel to the working table; the feeding fixed jaw is on the same side as the working fixed jaw during the entire feeding stroke.
5. Comprehensive index inspection:
Take the outer circle Φ90—Φ100 ferrous metal bar to cut (choose the appropriate saw blade, the appropriate linear speed), and adjust the hydraulic speed control valve during the cutting process to the appropriate descending speed (observe the sawdust to determine). After cutting, check the perpendicularity between the saw section and its surface generatrix (perpendicularity tolerance 0.4/100mm).
a. The automatic sawing machine cuts 0.5, 2.0, and 5.0 slices respectively (generally more than 6 slices), and the uniformity of the thickness of the blanks can be detected under the standard conditions of ensuring the verticality of the two strips.
b. The detection of noise sound pressure level shall be determined in accordance with the new version of GB/T4215, the noise power level of metal cutting machine tools.
c. The safety operation should implement the new version of GB15760, the general technical conditions for safety protection of metal cutting machine tools.
d. Appearance inspection
e. All parts are complete and the fasteners are connected reliably.
f. The paint coverage is complete, the color is bright and uniform, the color is uniform, and the senses are heavy; the surface is flat and smooth, the dead corners are cleaned, no oil and floating objects; no sag, no overlapping marks; the putty is polished and smooth, the edges and corners are full, the transition is uniform, and there is no bump Defects such as scratches, scratches, peeling, paint peeling, etc., sand smoothly.
g. The surface quality of the electroplated parts and blackened parts is good, and there are no defects such as bumps, peeling, meat loss, and painted faces.
h. The metal signs are riveted firmly and smoothly; the position of the self-adhesive trademark is correct, the fit is tight, and the sharp corners are not convex or warped.
6. Inspection of the spray paint quality of the whole machine:
a. Putty is applied to the dents on the non-machined surfaces of castings and welded structural parts. The putty is required to be wiped smoothly, the contours of the firm parts are clear, the edges and corners are full, and the surface of the putty is smooth without cracks.
b. The non-processed surface of the whole machine is sprayed with iron red primer. The spray paint is required to be evenly covered, without dew point. Note that the whole machine must be derusted before spraying the primer to increase the adhesion of the primer.
c. In addition to the chrome-plated parts, black parts, motors, signs, control box panels, and scales, the driving wheel, driven wheel cover, guide movable frame, and control box spray paint are required for the whole machine. The surface paint is required to be uniform, with clear boundaries, and each part The edges and corners are full and smooth, no sagging, no stains, no scratches.