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What do 4.4 and 8.8 on threaded bolts mean?
The performance grade of bolts used for steel structure connection is 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9 and so on. Bolts of grade 8.8 and above are made of low carbon alloy steel or medium carbon steel and heat-treated (quenched, tempered), which are generally called high strength bol...Read more -
Hole processing knowledge, very comprehensive, a must-read for robots
Compared with external surface processing, the conditions of hole processing are much worse, and it is more difficult to process holes than to process external circles. This is because: 1) The size of the tool used for hole machining is limited by the size of the hole to be machined, and the rigi...Read more -
Machining center knowledge
The machining center integrates oil, gas, electricity, and numerical control, and can realize one-time clamping of various complex parts such as discs, plates, shells, cams, molds, etc., and can complete drilling, milling, boring, expanding, reaming, Rigid tapping and other processes are processe...Read more -
The machine has been working for a lifetime, what does the 4.4 and 8.8 on the bolt mean?
The performance grades of bolts for steel structure connection are divided into more than 10 grades such as 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, etc. Among them, the bolts of grade 8.8 and above are made of low-carbon alloy steel or medium-carbon steel and are heat-treated (quenching, t...Read more -
Process measures and operation skills to reduce deformation of aluminum parts
There are many reasons for the deformation of aluminum parts, which are related to the material, shape of the part, and production conditions. There are mainly the following aspects: deformation caused by internal stress of blank, deformation caused by cutting force and cutting heat, and deformat...Read more -
One article to understand drilling, reaming, boring, pulling… A must read for machinery industry worker!
Drilling, pulling, reaming, boring… What do they mean? The following will teach you to easily understand the difference between these concepts. Compared with external surface processing, the conditions of hole processing are much worse, and it is more difficult to process holes than to proc...Read more -
Detailed explanation of common terms of CNC system, necessary information for machining professionals
Increment pulse coderThe rotary position measuring element is installed on the motor shaft or the ball screw, and when it rotates, it sends out pulses at equal intervals to indicate the displacement. Since there is no memory element, it cannot accurately represent the position of the machine tool...Read more -
CNC programming engineer factory technical specification
1. Clarify the responsibilities of the programmer, and be responsible for the control of processing quality, processing efficiency, cost control, and error rate in the mold CNC manufacturing process.2. When the programmer receives a new mold, he must understand the requirements of the mold, the r...Read more -
Application and Skills of CNC Machining Cycle Instruction
1 IntroductionFANUC system is one of the commonly used control systems for CNC machine tools, and its control commands are divided into single cycle commands and multiple cycle commands.2 programming ideasThe essence of the program is to find out the characteristics of the tool trajectory, and re...Read more -
The measuring tools in the machinery factory are all senior engineers who understand it!
1. Classification of measuring instrumentsA measuring instrument is an instrument that has a fixed form and is used to reproduce or provide one or more known quantities. Different measuring tools can be divided into the following categories according to their use:1. Single value measuring toolA g...Read more -
Coarse and fine thread, how to choose?
How fine is the thread that can be called a fine thread? We might as well define it in this way. The so-called coarse thread can be defined as a standard thread, while the fine thread is relative to the coarse thread. Under the same nominal diameter, the number of threads per inch is different, t...Read more -
Basic common sense of machining, don’t do it if you don’t understand it!
1. Benchmark Parts comprise several surfaces, each with a specific size and mutual position requirements. The relative position requirements between the surfaces of the parts include two aspects: the distance dimensional accuracy between the surfaces and the relative position accuracy (such ...Read more