Category: Manufacturing Technology knowledge

With the development of science and technology, the requirements for injection molding process are becoming higher and higher. The choice of injection molding mainly depends on the type of plastic, the initial shape, and the shape and size of the product. The common methods of injection molding include extrusion, injection molding, blow molding and calendering. Each method has its advantages and disadvantages, and is more suitable for specific applications. injection molding Injection molding: also known as injection molding, its principle is to add granular or powdery raw materials into the hopper of the injection machine. The raw materials are heated…

What to do if the paint strength is insufficient? There are two cases of insufficient coating strength: one is the normal drying strength, the other is the strength after high temperature washing. The two cannot be replaced. The normal drying strength is high ≠ the high temperature strength, and accidents will occur if misunderstood. 1. There are three reasons for insufficient drying intensity First, the performance of additives is insufficient; second, the amount of additives is insufficient; third, there is a problem with aggregate powder. The former two are easy to understand, while the latter may not be universally and…

This paper summarizes some problems of stamping die and lists some corresponding solutions for your reference. 1. Scrap jumping 1) The length of the punch is not enough, and the punch shall be replaced according to the thickness of one material cut into the female die by the cutting edge of the punch plus 1mm 2) If the clearance of the female die is too large, cut in the die to reduce the clearance or use a draper to reduce the clearance 3) If the punch or template is not demagnetized, demagnetize the punch or template with a demagnetizer 2.…

1、 Flow marks and patterns Visual inspection: the casting surface has stripes consistent with the flow direction of liquid metal, and has obvious non directional veins different from the color of the metal substrate, without development trend. 1. The causes of flow marks are as follows: 1) Too low mold temperature 2) Poor runner design and poor internal gate position 3) Material temperature is too low 4) Low filling speed and short filling time 5) Unreasonable gating system 6) Poor exhaust 7) Spray is unreasonable 2. The pattern is caused by excessive coating or poor coating quality in the mold…

01 Methods to prevent quenching cracks (1) Reasonably design part shape The design of equal wall thickness shall be adopted as far as possible to avoid abrupt changes in cross section shape: ① The parts with large difference in wall thickness shall not be made into a whole, and the mosaic structure shall be adopted so that each block can be as strong as possible; ② Large parts shall be designed as hollow structure as far as possible; ③ If necessary, process holes shall be opened; ④ Sharp corners shall be avoided at the corners of the contour, and larger…

When a sheet metal processing enterprise has just received a new production project to prepare for investment, it will face such a choice: should it buy a laser cutting equipment or a CNC punch? As we all know, in today's sheet metal processing industry, there seem to be ten thousand reasons to promote sheet metal processing enterprises to invest in laser cutting machines. In addition, with the increasingly vigorous development of the co processing business, many enterprises may start to consider gradually withdrawing the outsourcing processing business and plan to enter new business areas at the same time. If the…

The non-standard design work involves a wide range of aspects. Because the nature of the profession is to solve problems in all aspects, non-standard designers are required to have a wide range of knowledge and knowledge. The more knowledge, the more effective the work, the more knowledge, the more experience, the more methods to solve problems, the faster and more accurate. Today, I would like to share with you the mistakes that are easy to make and the details that are ignored in non-standard mechanical design. I hope it will be helpful to you! Major errors that must not occur…

There are many process parameters of ion nitriding. In addition to the common nitriding temperature and time, it is also related to furnace gas pressure, gas source, gas pressure and flow rate, voltage and current, gas extraction rate and other factors. 01 Nitriding temperature and time 1) The nitriding temperature of ion nitriding is basically the same as that of gas nitriding, generally 500~540 ℃. There is an optimal corresponding value between the nitriding hardness and temperature of different materials, generally 450~540 ℃. When the temperature is higher than 590 ℃, the hardness will decrease significantly due to the accumulation…

The role of four types of stainless steel and alloy elements Stainless steels can be divided into four types: austenitic, martensitic, ferritic and duplex stainless steels (Table 1). This is based on the metallographic structure of stainless steel at room temperature. When low carbon steel is heated to 1550 ℉, its structure changes from ferrite phase at room temperature to austenite phase. When cooling, the microstructure of low carbon steel is transformed into ferrite again. The austenite structure at high temperature is nonmagnetic, and its strength is smaller and toughness is better than that of room temperature ferrite. When the…

1、 Broken wire 1. Poor discharge state - reduce the P value. If the P value decreases greatly and the wire is still broken, consider reducing the I value until the wire is continuous. This operation will reduce the processing efficiency. If the wire breaks frequently, please refer to the following contents to find out the root cause of the wire break. 2. The liquid flushing state is not good, and the upper and lower nozzles cannot be veneered, or the broken wire is usually located in the processing area during open machining—— Lower the P value and check whether…