Hi, this is little control in the housekeeper, today to bring us the valve manufacturing process must be the requirement of technology for valve design is put forward,


1) casting(1) should be taken into account according to the characteristics of different materials, reasonable structure, for example, due to the volume of malleable iron shrinkage and need to be annealed heat treatment, casting size and thickness should be small as far as possible, and stainless steel castings illiquid, design selection of thickness should be increased appropriately, as far as possible simple shape,
(2) wall thickness should be uniform, the node should be circular arc and the necessary slope to ensure smooth transition, and should try to avoid too much metal accumulation, lest produce shrinkage cavity, osteoporosis, defects such as cracks,
(3) the air knife at the bottom of the valve body should not be too narrow, too deep, in order to make the sand core has the certain strength, air knife arc radius should not less than as far as possible according to valve size decision, to avoid impact broken when pouring core sand to make it difficult,
(4) determine the body * small thickness, not only to calculate according to the strength and stiffness, consider the casting condition and casting methods of manufacturing, do good quality, light weight, save material,
(5) must consider the die is convenient,

2) forging
1) forging shape should be as simple as possible, for batch big parts should adopt die forgings,
(2) the proper draft Angle, and try to avoid sharp corners and sharp edges,

3) heat treatment
(1) of the heat treatment requirements shall be according to the properties of the material reasonable choice, such as hardness and mechanical properties of high and low and stipulate the scope of a reasonable,
(2) easy to generate in the process of heat treatment deformation of parts should be appropriate to enhance parts of rigidity,

4) welding, mechanical and assembly under the
Surfacing welding pieces of base should be considered and weldability of surfacing welding material, in order to avoid defects such as cracks, at the same time, still should choose proper hair bad size,
(2) have the locating datum, facilitate the clamping, add the
(3) to facilitate measurement, and the best design basis and the measurement datum,
(4) the design to choose standard cutting tools, fixture, under standard measuring tool to create conditions, to reduce the homemade arts equipment,
(5) facilitate grinding and assembling,

Finished,