Since its establishment in 2004, Longwei has always adhered to the business philosophy of "Technological Innovation, Integrity First, Quality Oriented", provides millions of roller every year globally for various industries. We are still looking for ways to improve quality and production efficiency from raw materials and processes.
Materials
The quality of raw materials is the key to ensure the quality of roller. Therefore, all raw materials that enter the factory must be strictly "double-checked" before being put into storage. Check the test report, count the quantity, observe the appearance, measure the wall thickness and liearity, etc., only the qualified materials can be put into storage and production.
Tube: run-out and roundness are the key indexes that affect the performance of the roller, which will directly affect the stability and reliability of the transportation of goods. There are many factors that affect the run-out, mainly the roundness and straightness of the tube. Our company selects the straight seam high frequency precision roller special welded tube, meet the technical standards of GB/T13793, and customized production according to the higher dimensional tolerance, so that the roller can have better round run-out performance than JB/T 7012-2008.
Shaft: all the load on the roller is ultimately borne by the shaft. Our company selects high quality high precision drawn round steel as the shaft material, the surface finish is good, easy to cut processing, has greater strength and hardness, all the technical indexes are in line with GB/T 905 related requirements.
Bearing is one of the most critical parts of the roller. Proper selection directly determines the performance and life of the roller. According to the characteristics of the roller, we have configured different types of bearings for each type of roller, and specified clearance, lubrication and sealing methods.
Blanking
Our company has introduced a number of automatic high speed precision cutting machine, suitable for market conventional Φ25, Φ32, Φ38, Φ50, Φ57, Φ60, Φ63, Φ70, Φ76, Φ89 tube and Φ8, Φ10, Φ12, Φ15, Φ17, Φ20, Φ25, Φ30 round steel cutting. Automatic feeding, cutting and discharging, cutting length tolerance of within ±0.1mm, each feeding machine can cut 2000-3000 pieces/shift (8H), the efficiency is about 3 times compare with manual blanking, cutting process does not need cutting oil which is friendly to environment.
Welding
There are often welding processes in the production of the roller, such as welding between the tube and the sprocket, welding between the tube and the flange. Our company introduced argon arc protection automatic welding machine and carbon dioxide gas protection automatic welding machine, the equipment is easy to operate and observe, can work for a long time, reduce manual work intensity, improve production efficiency. Inert gas argon protection, can effectively reduce the workpiece combustion loss; Argon arc welding has stable arc combustion, heat concentration, high temperature of arc column, narrow heat-affected area, dense weld, no welding slag on the welding surface, and no need to do welding treatment, so as to ensure high strength and nice appearance.
Machining Work
Before the roller assembly, we will do a lot of processing on the cut down tube and shaft. For example: burr removal, chamfering, punching ear, milling flat or tapping, etc. We not only introduced large-scale automated processing equipment and CNC equipment, but also independently developed some equipment to improve processing accuracy and production efficiency.
Automatic double-head double-side milling machine: self-developed automatic double-head double-side milling machine, both ends of the milling at the same time, to ensure the parallelism of both ends within 0.04mm, high efficiency.
Automatic dual-head impact earphone: the self-developed automatic dual-head impact earphone has a tolerance accuracy of ±0.1mm and high efficiency.
