Integral spinning forming method of crankshaft silicon oil shock absorber housing

Abstract

An integral spin forming method for the silicone oil damper housing of a crankshaft, comprising the following steps: a) blanking; b) punching a central hole; c) performing shoveling and spinning to increase the thickness, i.e. performing a shoveling and spinning operation on a circular sheet (3) on a computerized numerical control spinning machine using a first shoveling and spinning wheel (1) and a second shoveling and spinning wheel (5) simultaneously, and forming an inner cylinder on the circular sheet (3); d) extending and spinning to form an outer cylinder, i.e. performing flanging processing on the circular sheet (3) on the computerized numerical control spinning machine using a flanging wheel (13), and performing spinning processing using a spinning and flattening wheel (15) so as to form an outer cylinder on the circular sheet (3) which is concentric with the inner cylinder; e) forming teeth by spinning; and f) machine processing. The integral spin forming method is highly adaptable, the silicone oil damper housing of a crankshaft which is made using the method has good sealing performance, allows the quality to be easily controlled, and has a long service life.

Description

technical field [0001] The invention relates to a processing method for a crankshaft silicone oil shock absorber shell, in particular to an integral spinning forming method and a processing method for the crankshaft silicone oil shock absorber shell. Background technique [0002] In order to reduce the torsional vibration of the crankshaft, improve the fatigue life of the crankshaft, and reduce the vibration and noise of the whole vehicle, modern automobiles will install a crankshaft torsional vibration damper at the front end of the crankshaft with the largest torsional vibration amplitude of the engine. According to the different ways of reducing torsional vibration, it can be divided into three types: dynamic type, damping type and composite type, and the crankshaft silicone oil shock absorber belongs to a kind of damping shock absorber. This silicone oil shock absorber requires good sealing and a large inertial body to ensure reliable operation and meet good use requirem...

AI Technical Summary

Problems solved by technology

Integral casting is easy to produce shrinkage cavity, shrinkage porosity, etc., its mechanical properties cannot be guaranteed, and the sealing performance is difficult to meet the requirements; forging machining has low material utilization rate, large machining allowance, metal flow line is cut off, and the resistance of parts Defects such as low corrosion performance

During tailor welding, due to the uneven distribution of chemical components in the welding zone, resulting in uneven distribution of mechanical properties and poor dynamic balance of the product, its life and dynamic characteristics will be greatly affected, and various quality problems are prone to occur

For example, the publication number is CN 101672340A "Silicone Oil Shock Absorber Shell and Its Manufacturing Method", although the welding process is adopted, its material utilization rate is not high, and at the same time because the bottom of the cylindrical inner tube is directly welded to the basin Affected by welding defects, the middle part of the outer cylinder is prone to various welding defects. It is also difficult to guarantee the concentricity of the inner and outer cylinders, and its molding quality is difficult to control.

[0004] Aiming at the problem of welding defects, there has been a molding method for silicone oil shock absorber shells (application number 2012105894302). The processing steps are blanking, punching, shoveling, bending, spinning and machining. The steps can prepare integrally formed inner and outer cylinders to avoid welding defects, but the application does not describe the specific operation of the shoveling wheel, what kind of shoveling wheel is used, and the arrangement between the wheels, and the shoveling wheel There is no description of how to control the process to obtain an inner cylinder with uniform thickness, and the application for forming the outer cylinder is stamping and bending. This process will cause insufficient material defects in the round corner transition area of ​​the outer cylinder, resulting in transition The thinning of the area will affect the performance. In addition, when the tooth surface has large convex ribs, this process also needs to carry out wheel aggregation, which not only increases the tediousness of the process, but also has poor adaptability.

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