Category: Manufacturing Technology knowledge

Causes and Solutions of Injection Molding Defects of TPU Products During the injection molding of thermoplastic polyurethane (TPU), the dried and preheated TPU granules are transported from the hopper of the injection molding machine to the heated barrel. When they are in the molten state, they are injected into the closed mold with relatively low temperature through the propelling action of the screw (or plunger) and the nozzle at the front end of the barrel to fill the mold cavity, and are cooled and solidified under pressure. After demoulding, the same TPU product as the mold cavity is obtained. […

Detailed calculation method: 1) First of all, you can ask the other party to provide a preliminary process arrangement for key or complex parts, detailed to each process and the time consumption of each process 2) The processing cost can be calculated according to the hourly cost of equipment required for each process. You can also ask the supplier for specific equipment costs, for example, Ordinary vertical heating is between ￥ 60~80 per hour (tax included). Milling machines, ordinary cars and other ordinary equipment are generally ￥ 30... 3) The price is based on the proportion of packaging and transportation,…

Technological measures to improve machining accuracy Direct error reduction method: direct error reduction is a basic method widely used in production. After finding out the main factors that cause machining errors, various technological measures can be taken to directly eliminate their effects in whole or in part. Error compensation method: It is to artificially create a new original error to offset the original error inherent in the original process system. Thus, the machining error is reduced and the machining accuracy is improved. Error transfer method: in essence, it transfers the geometric error, stress deformation and thermal deformation of the process…

Because the stamping die often loses its working size due to wear in the production process, it is difficult to meet the production requirements. Therefore, it is critical to improve the durability of stamping dies. This paper introduces several methods to improve the durability of stamping dies. Several ways to help improve the durability of stamping dies Improving the Design of Stamping Die Whether the design of stamping die is reasonable is the basis of improving the durability of stamping die. Therefore, effective measures should be taken to improve the durability of the stamping die when designing the stamping die,…

The material used to make sand mold is called molding material, the material used to make sand mold is generally called molding sand, and the molding material used to make sand core is called core sand. Generally, molding sand is composed of raw sand (mountain sand or river sand), clay and water in a certain proportion, of which clay is about 9%, water is about 6%, and the rest is raw sand. Sometimes a small amount of additives such as coal powder, vegetable oil and wood chips are added to improve the properties of molding sand and core sand. The…

Transparent plastics are widely used in life and have become one of the necessities. Transparent plastic products should be strictly operated in terms of raw material preparation, equipment and mold requirements, injection molding process and raw material handling of products. 1、 The preparation and drying of materials may affect the transparency of products due to any impurities contained in the plastic, so it is necessary to store and transport the materials. During the feeding process, attention must be paid to sealing to ensure that the raw materials are clean. In particular, the raw materials contain water, which will deteriorate after…

The production of PET blow molding bottles can be divided into injection stretch blow molding (injection stretch blow molding for short) and extrusion stretch blow molding (extrusion stretch blow molding for short) according to the different preforms of parison. The process of injection, drawing and blowing is that the preform with bottom is injected first, and then it is continuously sent to the heating furnace (infrared or electric heating) by the conveyor belt after cooling, and then it is heated to the stretching temperature, and then it is brought into the blowing mold for axial stretching with the help of…

Machining is the abbreviation of mechanical processing, which refers to the processing technology of accurately removing materials through processing machinery. Mechanical processing mainly includes manual processing and numerical control processing. Manual processing refers to the method of processing various materials by mechanical workers manually operating milling machines, lathes, drilling machines, sawing machines and other mechanical equipment. Manual processing is suitable for small batch and simple parts production. Numerical control machining (CNC) refers to the use of CNC equipment by machinists for machining, including machining centers, turning and milling centers, wire EDM equipment, thread cutting machines, etc. At present, the vast…

Ductile iron is an important casting metal material developed in recent 40 years in China. The tensile strength, plasticity and toughness of nodular cast iron are higher than those of other cast iron due to the small stress concentration caused by spherical graphite and the small splitting effect on the matrix. Compared with steel with corresponding structure, the plasticity is lower than that of steel, the fatigue strength is close to that of ordinary medium carbon steel, the yield ratio can reach 0.7~0.8, almost twice that of ordinary carbon steel, and the cost is lower than that of steel, so…