1.Idler tube, idler shaft (cold drawn round bar), stamping bearing seat and supporting seals should be tested, the pipe diameter oval tolerance ≤ 0.6mm, cold bar diameter tolerance + 0.002- +0.012mm.Bearing seat and supporting the seal to be the first test assembly, shaft retainer must be steel, installed after the constant, no deformation.Other accessories should be tested before they can be used. Due to large quantities of accessories, inspection for the sampling, production, assembly found problems, the workshop should promptly notify the quality inspection staff, quality inspection department is responsible for organizational analysis, processing.
2. Cutting: When the tube and the shaft are unloaded, the cutting surface of the pipe and the shaft shall be perpendicular to the axis.Pipe and shaft length tolerance ≤ 2mm, vertical tolerance ≤ 2mm.
3. Pipe processing: When machining the pipe bearing steps on both ends of the pipe, the machining diameter and depth dimensional tolerances must meet the drawing requirements to ensure the concentricity of the two housings and the assembly requirements for both ends of the retainer.
4. The processing of the shaft: the processing of the shaft, the two ends should be flat, the groove depth of the groove to be processed according to the drawings, the depth of tolerance in line with the requirements of the drawings; two bay groove spacing to maintain the size of the pipe with the flat pad gap ≤ 1mm.When machining the flat shaft, the dimensions and spacing tolerances of the two ends should meet the requirements of the drawings.
5. Butt welding: in the double-headed automatic butt welding machine bearing, pipe welding, tooling should be tight fit and must ensure that coaxial does not skew, do not shake;Circumferential weld should be uniform, smooth, solid, weld height is not allowed to less than 3mm, strictly Weld, partial welding, missed welding, or should be welding operations.After welding must be carried out the necessary grinding, cleaning, idler surface is strictly prohibited there is welding.Welding of different diameter of the idler, the rotation speed, welder wire feed speed, wire diameter, welding current and voltage should be adjusted to ensure that the weld strength and size to meet the requirements.
6. Bearing: In the hydraulic automatic bearing on the installed shaft and bearing, you must ensure that the seal without leakage, the bearings are properly lubricated and put positive.The installation of positioning: the installation should be accurate, the bearing that is to be pressed in place and strictly prohibited overpressure; to always check the installed chute and tooling center is consistent, to ensure that the rear axle and pipe, bearing concentric, flexible shaft rotation.
7. Seal and reed: before and after the oil chamber should be filled with special lubricants, sealing slots and bearings should be added to 2/3 of the space of the oil.When sealing and reed, iron seal should be close to the bearing seat, the spring and seal the gap should be within 1mm, the gap is greater than 1mm must be rework. The retainer should be fully seated in the slot. In the assembly, the seal must be replaced due to assembly damage, and the missing parts are forbidden.
8. After the assembly is complete, the idler to ensure that the rotation is flexible, can not have a jam, turn the phenomenon. On the completion of the idler, the operator should be tested one by one test, the rotation must be undisturbed.
9. In addition to the quality inspection personnel inspection process, but also the finished product should be sampled, the responsibility to find the responsibility of the unit to solve.
10. Idler finished products to be classified storage, placed neatly, is strictly prohibited bumps.
11. When shipping, the responsible unit should check the quality of the storage idler, the non-compliance with the above requirements must be processed until qualified.
12. Idler painting should be carried out before the surface of the idler, the paint should be uniform without leakage spray, spray the idler surface should be clean, to prevent sticky foreign body, affecting the product image.