This paper introduces a reliable and practical sample forming method. Firstly, the external dimensions of the workpiece are calculated according to the workpiece drawing, and then the central pressure point is located. Considering the utilization of materials, draw a layout. Analyze the outline and specific size of the workpiece, and punch it with a stamping die. It has high efficiency and simple operation. After the parameters are determined, the assembly of the die and the design and assembly requirements of the main parts are analyzed. In addition to design work instructions, assembly drawings. It also includes molds, non-standard parts drawings, processing drawings, processing cards and non-standard parts processing cards.
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Material: gd-al Si 12 Tieen46100 (standard UNI-5076).
Drawing angle 1
Unregistered radius R0.5
Hole deburring
The surface is clean and free of burrs.
Do not inject points in the sealing plate area.
-Diamond tools or machining with tungsten carbide tools.
Volume: 46.56cm3 (die casting)
: 43.99 cubic centimeters (in process)
3. Translation of English for Mould Specialty
Hardness is the influencing factor of wear resistance. In general, the higher the hardness of die parts, the better the wear resistance. In addition, the wear resistance is related to the type, quantity, shape, size and distribution of carbide materials.
English for Mould Specialty
The mold consists of three basic parts, namely, the floating cavity plate and the fixed template in the dynamic simulation part. The hole diameter of the push plate should be cut off with a core with a slightly larger diameter and a larger number of threads to prevent the threads from being scratched. An assembly mechanism consisting of a push plate, a push plate, a semi-fixed plate and an ejector rod of an injection molding machine. The distance from the floating cavity plate to the maximum movement limit control of nails or similar devices. The principles of injection molding and casting are very similar. When the resin material enters the rotary screw, it should enter three zones: feeding zone, compaction zone and plasticizing zone. The gate is the entrance of molten plastic into the cavity, and the shunt wall must be smooth to prevent the shape resistance of parting surface when the melt flows, which depends entirely on the shape contraction of plastic, making it difficult to eject plastic parts. During injection cooling, shrinkage depends on the melting process of plastic parts.
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Extrusion molding process
The process of thermoplastic extrusion molding is divided into four stages.
Plasticizing stage
Plastic raw materials processed by dry method are added into nitriding barrel from extruder hopper, and after heating, screw rotation, compaction and mixing below, they are changed from solid powder or aggregate into uniform melt with certain fluidity for plasticizing processing.
Extrusion stage
Even the screw rotation plasticized with the plastic melt is sent to the front of a nitriding barrel, and the screw rotation can obtain a continuous profile with the same cross section and die shape on a certain die through the extrusion action of the extrusion die head.
Complete the design stage
After the thermoplastic leaves the die, it will be extruded out of the plastic continuous profile for cooling and setting, otherwise the plastic will be deformed under its own weight, and there will be depression or distortion.
In most cases, qualitative and cooling are completed at the same time. Only when all kinds of bars and pipes are extruded, there is a separate qualitative process, while the film extrusion and setting processes are not carried out separately, but only by cooling. Extruded plates and sheets are sometimes flattened by a pair of rollers, which have the effects of setting and cooling at the same time. Generally, air cooling or water cooling is adopted, and the cooling speed has a great influence on the surface roughness, size and shape accuracy of plastic parts. Hard plastics (such as polystyrene, low density polyethylene and rigid polyvinyl chloride). ) cannot be cooled too fast, otherwise it will easily cause residual stress and affect the appearance quality of plastic parts; Soft or crystalline plastic parts are required to be cooled in time to avoid deformation of plastic parts.
Traction plastic parts. Coiling and cutting
When plastic is extruded from the die, it usually expands after sudden release due to the pressure from the die, and then contracts after cooling, thus changing the size and shape of plastic parts. In addition, due to the continuous extrusion of plastic, the self-weight is getting bigger and bigger. If it is not guided, the plastic will stagnate and the plastic products cannot be extruded smoothly. Therefore, while cooling, we should constantly draw the plastic out, which is the traction.
The traction process is completed by the extruder auxiliary device at one time. Extrusion traction
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The speed should be adapted to the speed. Generally, the traction speed is slightly higher than the extrusion speed, which can eliminate the size change of plastic, and at the same time, proper stretching of plastic can improve the molding quality. Different plastics pull at different speeds. Usually, the drawing speed of films and monofilaments will be faster, because the drawing speed is faster, the diameter and thickness of plastic parts are reduced, the longitudinal strength is increased, and the tensile fracture resistance is increased. For extruded hard plastic parts, the traction speed should not be large, and it is usually necessary to adjust the traction speed within a certain range and be very uniform, otherwise it will affect its dimensional uniformity and mechanical properties.
Cutting (such as rod, tube, plate, sheet, etc.) by plastic traction on the cutting device according to the use requirements, or making a roll (such as film, monofilament, cable, etc.) on the winding device. In addition, some plastic parts, such as films, sometimes need post-treatment to improve dimensional stability.
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A Brief Introduction to the English Content of "Qi" Model
This book is written to meet the needs of English teaching for mold design and manufacturing majors in colleges and higher vocational colleges. According to the characteristics of mold technology and the new technology of modern mold manufacturing, the main content covers the relevant knowledge of mold design and manufacturing. * * * consists of 9 units, including: stamping, bending, stretching, extrusion, injection molding, mold processing and manufacturing, mold manufacturing equipment and system, mold quotation and contract, etc. This book can be used as teaching books or reference materials for mold design and manufacturing, electromechanical, mechanical, numerical control, material processing and other majors in colleges and higher vocational colleges, and can also be used as learning reference books for engineers and technicians engaged in mold design and manufacturing and mold foreign trade personnel.
A Brief Introduction to Ba-style English
Mold English, a training book for professional and technical personnel in higher vocational colleges. You can learn more about the translation between foreign languages and molds, and technicians can also make corresponding reference.
English for Mould Technology
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