What should be noted when purchasing second-hand broken-bridge aluminum window and door equipment?

Nowadays, there are many sellers of second-hand break-through aluminum window and door equipment, and many manufacturers also choose to purchase second-hand equipment. To some extent, purchasing second-hand equipment can indeed save a lot of expenses. Now, let's share with you how to inspect break-through aluminum window and door equipment.

1. The geometric accuracy of the parts, including dimensional accuracy, shape accuracy and surface penetration accuracy. Generally, items such as size, cylinder, roundness, flatness, straightness, coaxiality, parallelism, perpendicularity and runout can be identified. According to the repair nature, the geometric standards of individual parts do not need to be followed, and relative matching accuracy is required.

2. The quality of the parts, including surface roughness and whether there are scratches, corrosion, cracks, detachment, burning or cracks.

3. The physical and mechanical functions of the parts, in addition to the hardness and depth of the hardened layer, it is also necessary to conduct appropriate functional tests on the parts formed during the manufacturing and repair process, such as stress conditions, balance conditions, elasticity, stiffness, oscillation, etc.

4. Hidden defects of the parts, including internal slag, gas holes, pores, voids and welding during the manufacturing process, as well as micro cracks occurring during use.

5. The quality and dynamic balance of the parts, such as the mass difference between the piston and the connecting rod group, dynamic balance of high-speed rotating parts, such as crankshafts, fans, shafts, wheels, etc.

6. The material characteristics of the parts, such as the alloy composition of the parts, the carbon content at the carburizing stage, the uniformity of each part, the removal of graphite, the aging and transformation of rubber materials, etc.

7. The bonding strength between the parts and the surface material of the vehicle, such as coatings, spraying, surface treatment layers and the base material, mechanical fixed joints, bearing alloys, bearing plates, etc.

8. Cooperation of components, such as coaxiality, planar planetary, interlocking conditions, the consolidation of components.

9. The degree of wear of the parts of the break-through aluminum window and door equipment. Correctly determine the wear degree of the conflicting parts and worn parts, and continue to use based on the wear condition.

10. If sealing of the engine cylinder block and cylinder head is required, check for leaks.