Casting method of hollow crankshaft for mud pump

A hollow crankshaft and mud pump technology, applied in casting molding equipment, molds, mold components, etc., can solve the problems of crankshaft eccentricity, uneven wall thickness of floating cores, unreasonable riser setting, shrinkage holes, etc. Improve the quality of castings, improve the qualified rate of flaw detection, and prevent the sand core from breaking or deforming
CN103624218BActive Publication Date: 2016-03-02BAOJI PETROLEUM MASCH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BAOJI PETROLEUM MASCH CO LTD
Publication Date
2016-03-02

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Abstract

The invention discloses a casting method of a hollow crankshaft of a slurry pump. A casting model is utilized. The casting method comprises the following steps: manufacturing an actual sample and a core box of the hollow crankshaft; installing a sand discharge box, a large open riser, a slag collector and a pouring channel, opening open and hidden air holes in a sand mold, and arranging anti-cracking ribs in a turning part I and a turning part III; manufacturing a sand core and a core head mold body, manufacturing a core bar main rod, forming two groups of via holes in the core bar main rod, and welding a steel round positioning ring in each via hole; welding multiple reinforcing supports on the core bar main rod by reinforcing steel bars, winding a straw rope and a gas exhaust rope on the core bar main rod, putting a core bar into the core box, and filling sand for hardening; spraying paint; assembling the box; pouring; opening the box and spraying sand; polishing and repairing; normalizing; carrying out secondary sand spraying; and processing shaft holes in two end heads of the hollow crankshaft, thereby casting the hollow crankshaft of the slurry pump. The method provided by the invention can effectively prevent the structure defect of shrinkage cavity or shrinkage porosity partially.
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Description

technical field

[0001] The invention belongs to the technical field of mechanical equipment casting, and relates to a casting method of a hollow crankshaft for a mud pump. Background technique

[0002] The mud pump used in petroleum drilling equipment is very large, and the hollow crankshaft is the most important transmission part in the mud pump. The material is ZG35CrMoA. It has a complex structure and a large size. figure 1 As shown, 120 degrees each other such as figure 2 As shown, the middle design is hollow and the shape is complex as figure 1 shown.

[0003] Since the casting process design and production of the hollow crankshaft are very difficult, many casting process schemes have been adopted for a long time, but the hollow crankshaft blanks often have uneven wall thickness due to eccentric cores and floating cores, or due to Unreasonable riser settings lead to local shrinkage cavities and shrinkage porosity, resulting in extremely high waste rates. It is urgen...

Claims

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