42results about How to "Prevent deformation and instability" patented technology

The invention relates to a connection tube applied to the indoor machine and outdoor machine of an air conditioner and a manufacture method thereof. A taper face of weld is arranged at the joint welding position of a copper pipe, and raised grains are arranged on the outer wall of an aluminum pipe. During welding, a mosaic block is arranged at the welding position of the fixed electrode; a grooveis arranged in the mosaic block, raised grains are prepared on the groove; and the nominal diameter of the groove which bears raised grains is identical with the outer diameter of the aluminum pipe. The aluminum fluid melted during welding can be filled in the raised grains of the groove of the mosaic block, so that the deformation of the aluminum pipe is avoided, and the quality and strength of the product are improved. By such welding method, the aluminum pipe can be clamped to avoid breaking off; in addition, the outer diameter of the welding position of the copper-aluminum pipe joint is kept identical with the outer diameter of the aluminum pipe.

The invention relates to opposite roller spinning equipment, in particular to opposite roller spinning equipment for forming a large thin-walled cylindrical part, and aims to solve the problems that existing die spinning equipment is high in cost, poor in universality and long in manufacturing period as a core die is needed. A chuck substrate fixing base is installed on a rack between an internal rotation guide rail and an external rotation guide rail, a chuck substrate is installed on the chuck substrate fixing base, an external rotation mechanism fixing base is installed on the external rotation guide rail in a sliding mode, and an external rotation disc is installed on the external rotation mechanism fixing base; a bottom plate is installed on an internal rotation guide rail, a lifting motor is installed at the lower end of the bottom plate, one end of a lifting lead screw penetrates through the bottom plate, and the other end of the lifting lead screw is connected with a base; an internal rotation device fixing base is installed on the bottom plate, a worm and gear assembly is installed on the chuck substrate, a three-claw chuck is installed on the worm and gear assembly, multiple pull rods are connected with the external rotation disc, the chuck substrate and the base, an internal rotation device is installed in the internal rotation device fixing base, and the external rotation device is installed in the external rotation disc. The opposite roller spinning equipment is suitable for carrying out opposite roller spinning on the large thin-walled cylindrical part.

The invention discloses a welding method for loading a cold source with welding and controlling load with displacement. The method includes: applying a cold source with a certain power to other parts of the weldment before and during the application of the welding heat source; if the power of the cold source is not enough , then a displacement-controlled mechanical tensile load is applied simultaneously in the lengthwise direction of the weld and in the direction perpendicular to the weld. This method is that while the welding heat source acts, a certain power cold source acts on other parts of the weldment. If the total deformation caused by the cooling contraction in this area can be equal to the total deformation of the free thermal expansion of the heating part, then the heating The expansion of the part is not hindered, the stress will be zero, and no plastic deformation will occur. If the power of the cold source is limited, the total deformation caused by the cooling contraction is less than the total deformation of the free thermal expansion of the heating part, and a mechanical tensile load can be applied around the weldment at the same time to generate a certain stretch in the entire weldment or locally Elastic deformation to compensate or counteract the free thermal expansion deformation of a part of the heating part. In practice, welding with low stress and no plastic deformation can be realized, the compressive stress in the weldment can be reduced, and the instability and deformation of the thin plate can be avoided.

The invention discloses a laser heating induced isostatic pressing loading type die-less forming method of plates. The method comprises the following steps of: partially heating the plates through laser; applying isostatic pressing on liquid mediums; finishing the die-less forming of the plates by accumulating partial deformations of the plates. According to the laser heating induced isostatic pressing loading type die-less forming method of the plates, the shortcomings that the forming accuracy of a laser thermal stress forming method is not high and intricately shaped parts are difficult to form are overcome, and the machining speed and accuracy are accurately controlled, so that the size accuracy and good surface quality of the formed plates are higher, and the intricately shaped parts can be formed; the forming limit is improved, thus the machining procedures are simplified, the number of the machining procedures is reduced, and the machining efficiency is improved.