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So far YIJIN has created 138 blog entries.

Case Analysis of Connector


Product Name: Connector Product Purpose: It is used for connect and fixed Material: Stainless Steel 304 Classification of Stainless Steel Parts 1.Bolt: A type of fastener consisting of a head and a screw (cylindrical body with external threads), fitted with a nut, for fastening two parts with through holes. This type of connection is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection belongs to the detachable connection. 2.Stud: A type of fastener without a head and with only external threads at each end. To [...]

Case Analysis of Connector2022-01-24T11:44:37+08:00

Most Complete Thread Basics, Thread Gauge Overview


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 [...]

Most Complete Thread Basics, Thread Gauge Overview2022-01-21T16:15:24+08:00

Basic Knowledge of Machining


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 [...]

Basic Knowledge of Machining2022-01-20T13:53:53+08:00

Flange Optical Accessories-Case Study


Product Name: Flange Product Purpose: It’s Used in Optical Accessories 6061-T6 Material: Aluminum 6061-T6 Surface Treatment: Black Anodized and Yellow Conductive Oxidation Characteristics of Aluminum 6061-T6 Brief Introduction High strength, high hardness (up to HV90 degrees or more) aluminum has good processing effect and oxidation effect. It hasn’t trachoma stomata, flatness is better. It can improve the processing efficiency and reduce the material cost. Aluminum 6061-T6 is the best choice for low price and high quality material. 6061-T6 series for aluminum, magnesium and silicon alloy that is a heat treatment type of corrosion resistance alloy. The strength and corrosion [...]

Flange Optical Accessories-Case Study2022-01-17T10:11:09+08:00

Common CNC Machining Process: Turning, Hole Machining, Milling, End Milling, Copy Milling


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 [...]

Common CNC Machining Process: Turning, Hole Machining, Milling, End Milling, Copy Milling2022-01-14T17:22:28+08:00

Super Practical Knowledge of Reduce The Deformation of Aluminum Parts During Machining


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 [...]

Super Practical Knowledge of Reduce The Deformation of Aluminum Parts During Machining2022-01-12T15:40:33+08:00

Most Complete Steel Knowledge


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 [...]

Most Complete Steel Knowledge2022-01-11T17:24:25+08:00

Threaded Shaft- Case Study


Product Name: Threaded shaft Application: Chemical industry Material: 1.4435 round bar Threaded Shaft Processing Characteristics It is very easy to harden in the process. Because of the large plasticity of stainless steel, the character is distorted during plastic deformation, and the strengthening coefficient is very large; and the Austenite is not stable enough, under the action of cutting stress, part of the Austenite will be transformed into Martensite; in addition, compound impurities are in the cutting Under the action of heat, it is easy to decompose into a diffuse distribution, so that a hardened layer is produced during cutting. The work [...]

Threaded Shaft- Case Study2022-01-10T14:29:16+08:00

Why Titanium Alloy Is A Difficult Material To Process?


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 [...]

Why Titanium Alloy Is A Difficult Material To Process?2022-01-10T16:25:52+08:00

Why Bolt Crack Happened? YIJIN Hardware Experts Will Tell You Why


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 [...]

Why Bolt Crack Happened? YIJIN Hardware Experts Will Tell You Why2022-01-10T15:58:58+08:00