Pressure quenching die and technology for large-diameter thin arc plate carburized gear
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A technology of carburizing gears and large diameters, which is applied in the direction of gears, metal material coating technology, forming tools, etc., can solve the problem of high heat treatment deformation control requirements, and achieve the effects of improving heat treatment quality, convenient operation, and eliminating temperature differences
Active Publication Date: 2021-12-17
JIANGLU MACHINERY & ELECTRONICS GROUP
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This method has a simple process flow and high production efficiency, but the requirements for heat treatment deformation control in the carburizing and quenching stages are quite high
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Embodiment 1
[0048] S1. The part blank is a die forging. Before carburizing, the outer teeth, inner ring groove and groove bottom are all processed to a finishing allowance of about 0.3mm on one side. The arc plate is processed to the size required by the drawing, and anti-seepage paint is applied as required. ready for carburizing;
[0049] S2. The carburizing temperature is 930°C, the carburizing layer is (1.2-1.5) mm, and the carburizing equipment is an Ipsen controllable atmosphere multi-purpose furnace. The big end of the parts is placed flat on the material plate, and a 31mm high pad is used in the center block support;
[0050] S3. After carburizing + high-temperature tempering, scrub to remove the anti-seepage coating. The high-temperature tempering parameter is 640°C×240min, and then switch to quenching after high-temperature tempering;
[0051] S4. When quenching, put the large end of the part down and place it in an electric furnace for heating at a temperature of 800±10°C for ...
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Abstract
The invention discloses a pressure quenching die and technology for a large-diameter thin arc plate carburized gear, relates to the technical field of heat treatment pressure quenching dies and technologies, and solves the technical problems of heat treatment deformation and low production efficiency of an existing control gear. The pressure quenching die comprises a mandrel base, a blocking plate, a supporting plate, an outer ring supporting ring, a guide cone fixing screw, an outer pressing ring, an inner pressing ring, an inner hole die guide cone, an inner hole expanding die, a screw, a spring, a fixing ring, a guide cone reset spring, a hexagon socket cap screw, a standard elastic washer, an ejector rod and a ring spring. The gear is heated to the quenching temperature, the temperature is kept for a period of time, the gear is transferred from a heating furnace and is sleeved with the pressure quenching die by the aid of a special extraction assistive tool, a press is started, plane warping, limiting diameter, height size and the like are corrected under the combined action of the press and the die, a part meeting the finish machining requirement is obtained. The die has the characteristics of being convenient to operate, long in service life, good in gear shape correction effect and the like, and is worthy of application and popularization.
Description
technical field [0001] The invention relates to the technical field of heat treatment pressure quenching dies and processes, and more specifically relates to the field of press quenching dies and processes for large-diameter thin arc plate carburized gears. Background technique [0002] The steering gear is an important part in the comprehensive transmission device of the planetary transmission mechanism, which plays the role of transmitting the steering power. A steering gear is a large-diameter thin arc plate structure, the material is 20Cr2Ni4A steel, the φ158 inner ring groove and outer teeth require carburizing, the inner spline is not allowed to be carburized, the common normal diameter of the outer teeth is φ435mm, the arc plate wall thickness is 9mm, and the inner ring groove 31mm in the air. [0003] The economical and efficient manufacturing process of this part is: blanking→die forging→preheat treatment→rough machining to only remaining→carburizing+quenching→fini...
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