Basic Knowledge of Thread Gauge Structural Elements of Thread Type of Thread Specified Drawing of Thread Thread Gauge TypesCylindrical Thread Gauge American Standard Unified Thread Gauge Gauges for Metric Trapezoidal Screw Threads Taper Thread Gauge Gauge for 60° Taper Pipe Thread Metric Taper Thread Gauge Petroleum Special Thread Gauge Gas Cylinder Special Tapered Thread Gauge Pipe Thread Gauge with Thread Seal Code for Thread and Thread Gauge American Inspection System for Fastening Threads (UN, UNR, UNJ, M and MJ) Basic Knowledge of Thread Gauge A thread gauge is a gauge used to [...]

Datum Parts are composed of several surfaces, and each surface has certain size and mutual position requirements. The requirement of relative position between parts surfaces includes two aspects: The distance dimensional accuracy and relative position accuracy (such as coaxiality, parallelism, perpendicularity and circular runout, etc.) between surfaces are required. The study of the relative position relation between the surfaces of parts is inseparable from the datum, and the position of the surfaces of parts cannot be determined without a definite datum. In its general sense, the datum is the point, line, and surface on the part that is used to determine the [...]

Turning is a machining method that uses cutting edges with specific geometric shapes to rotate the workpiece. Generally, the workpiece rotates while the tool of a single cutting edge moves along the machined surface. While a single cutting edge tool moves along the machined surface, turning is the most common machining method in modern machining methods compared to boring and milling. At present, the problem of turning is almost confined to the cost of chip formation and processing. Controlled chip flow and chip breaking in turning means not only that the material being removed is removed from the machined area, but the chips [...]

There are many reasons for the deformation of aluminum parts, which are related to the material, shape of the part, and production conditions. Machining deformation of aluminum parts mainly includes the following aspects: deformation caused by internal stress of blank, deformation caused by cutting force and cutting heat, and deformation caused by clamping force. Process Measures to Reduce Machining Deformation of Aluminum Parts 1.Reduce The Internal Stress of Aluminum Blank Natural or artificial aging and vibration treatment can partially eliminate the internal stress of the blank.Pre-processing is also an effective process method.For coarse blank, due to the large margin, so the deformation after [...]

Mechanical Properties Of Steel   1.Yield Point (σs) When the steel or sample is stretched, when the stress exceeds the elastic limit, even though the stress does not increase, the steel or sample still continues to undergo obvious plastic deformation, which is called yield. The minimum stress value at which the yield phenomenon occurs is the yield point. Suppose Ps is the external force at the yield point s and Fo is the fault area of the sample, then the yield point σs =Ps/Fo(MPa). 2.Yield Strength (σ0.2) The yield point of some metal materials is not obvious and it is difficult [...]

Why do we think titanium alloy is a difficult material to process? Because of the lack of deep understanding of titanium alloy processing mechanism and phenomenon. Physical Phenomena of Titanium Alloy Processing The cutting force during titanium alloy processing is only slightly higher than that of steel with the same hardness, but the physical phenomenon of processing titanium alloy is much more complicated than processing steel, which makes titanium alloy processing face huge difficulties. The thermal conductivity of most titanium alloys is very low, only 1/7 that of steel and 1/16 that of aluminum. Therefore, the heat generated in the process of cutting titanium alloy [...]

Large-size hexagonal bolts produced by a high-strength fastener company, the specifications are M48 to M64, and the materials are: 42CrMoA, 40CrNiM0 and other medium carbon alloy structural steels. In the process of cutting, forging, and heat treatment of the bolt, especially after the heat treatment, cracks of different forms were found. The total amount of cracks is less than 5% of the output, but it seriously affects the quality of the bolt and the subsequent processes. Most of the cracks are transverse cracks and hexagonal plane cracks, but there are also other types of bolt crack. From the perspective of the [...]