亚州AV综合色区无码一区_亚洲国产精品久久久久久久_亚洲熟妇无码av另类vr影视_国产精品XXXX国产喷水

Multiple diversion and convergence, changing the flow direction to homogenize the composition and temperature of the melt. The mixing section is an inward slotted structure set at the end of the ordinary screw homogenization section, with an outer diameter equal to the outer diameter of the screw. The trench is divided into several groups, and between each group is the convergence area of materials. The material is divided by grooves, converged in the convergence area, and then divided and converged. The principle is similar to the pin type. The characteristic of a separated screw is that in addition to the original screw thread (called the main screw), there is also an additional thread (called the additional thread) on the melting section, whose outer diameter is slightly smaller than the outer diameter of the main thread. The lead of the main and auxiliary threads is different. The auxiliary thread starts from the end of the feeding section (and is connected to the feeding section), passes through several threads, and gradually intersects with the main thread of the homogenization section. The depth of the screw groove and the thread lead of this screw gradually change from the feeding section to the homogenization end. The thread lead gradually narrows from width, and the depth of the screw groove gradually shallows from depth, which can compress the material.

Preheating of workpieces before spraying: Preheating of workpieces before spraying has great practical significance, as it can remove surface moisture and reduce the accumulation of stress in the coating. Especially for shaft parts of the same size as our factory, a preheating temperature of around 100 ° C is more suitable. Spray aluminum coated nickel composite powder F505 as the bonding layer on the surface of the processed shaft neck. The thickness of the bonding layer is 0.10-0.15mm, which is only used for bonding purposes, so there is no need to spray too thick. After spraying the bonding layer, spray the G101 powder working layer. G101 powder must be preheated and baked at a temperature of 105-250 ℃ before use to ensure the fluidity of the powder spraying and avoid clumping and blocking the spraying channel. During the spraying process, strict control is exercised over gas pressure, flame temperature, spraying distance, spraying angle, and movement speed to ensure that the coating is uniform, flat, and firmly bonded. The specific control parameters are as follows: the coating position is an outer curved surface; Preheating temperature 100-200 ° C. Spray distance 180-200mm; Spray angle 90 °; The movement speed of the spray gun is 6-12mm/min; The linear speed of the rolling mill is 8-12m/min.

When spraying the working layer, a neutral flame is used, and powder can be observed from the flame. At the end of the flame, the powder appears bright white, indicating that the temperature is high. If it is dark red or red, the temperature is not enough. At this time, it is necessary to adjust the size of the powder feeding airflow and flame energy to heat the powder to a bright white color. At this point, the powder temperature is high, the speed is fast, and the deposition effect is good.

Metal processing after spraying: After spraying, the sprayed area is wrapped with multiple layers of asbestos to slow down and prevent cracking. When cooled to room temperature, rough turning can be carried out, leaving a grinding allowance (about 0.3-0.5mm) before grinding. Grind according to the required dimensions and specified roughness on the drawing. At this point, the repair of the rolling mill has been completed.

In terms of usage, screw bearings provide a standardized variety of products to adapt to various purposes. The circulation methods widely used in machine tools include circulation conduit type, circulation device type, and end cover type. The preloading methods include positioning preloading (double nut method, positioning preloading method) and fixed pressure preloading.

You can choose the appropriate type according to the purpose. The lead screw has a high-precision ground screw and a cold-rolled screw bearing formed by high-precision cold rolling processing.

In addition, to meet the urgent delivery needs of users, there are also finished products that have been processed at the end of the shaft, semi-finished products that can be freely processed at the end of the shaft, and cold-rolled screw bearings. As the peripheral components of this bearing, the necessary screw support units, nut supports, locking nuts, etc. for use have also been standardized and available for users to choose from.

Screws are commonly used in plastic molding equipment, such as plastic profile extruders, injection molding machines, etc. The screw and barrel are the core components of plastic molding equipment. It is the part of heating extrusion plasticization. It is the core of plastic machinery.

Screws are widely used in machining, CNC machines, CNC lathes, injection molding machines, wire cutting, grinding machines, milling machines, slow wire, fast wire, PCB drilling machines, precision carving machines, engraving and milling machines, spark discharge motors, biting machines, planers, large vertical lathe gantry milling, and so on.