Nitridation apparatus and process for cast iron piston ring

A cast iron piston and piston ring technology, applied in metal material coating process, coating, solid diffusion coating, etc., can solve the problems that the product is difficult to meet customer requirements, the nitriding process of cast iron piston ring, and the process are not well understood. Achieve the effect of meeting market demand, low production cost and high economic benefit

Inactive Publication Date: 2009-04-08
HUAMIN NANPING AUTOMOBILE FITTINGS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most domestic piston ring manufacturers only carry out nitriding treatment on steel piston rings, and the nitriding process and technology are relatively mature, but they do not know much about the nitriding process and technology of cast iron piston rings, and the products are difficult to satisfy customers. Require

Method used

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  • Nitridation apparatus and process for cast iron piston ring
  • Nitridation apparatus and process for cast iron piston ring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Nitriding process is:

[0055] (3) Preparations before nitriding: cleaning, drying, pickling, cleaning and drying;

[0056] (4) Nitriding, using an industrial nitriding furnace, using gas nitriding:

[0057] A. Preparation stage:

[0058] a) Check whether ammonia gas, nitrogen gas and desiccant are sufficient;

[0059] b) Clean the furnace, furnace cover and hangers, dredge the pipeline and confirm that the pipeline is unimpeded;

[0060] c) Hang the pickled, oil-free and water-stained ring flat and tightly on the hanger with the opening facing upwards;

[0061] d) Slowly hang the hanging ring into the furnace;

[0062] e) Apply a layer of silica gel and clay mixture on the sealing ring, cover the furnace cover and tighten the bolts;

[0063] f) Insert the thermocouple and connect the ammonia gas and waste gas pipelines;

[0064] g) Adjust the position where the exhaust gas enters the water so that the pressure in the furnace is 600mm water column;

[0065] B. He...

Embodiment 2

[0078] Nitriding process is:

[0079] (1) Preparations before nitriding: cleaning, drying, pickling, cleaning and drying;

[0080] (2) Nitriding, using industrial nitriding furnace, using gas nitriding:

[0081] A. Preparation stage:

[0082] a) Check whether ammonia gas, nitrogen gas and desiccant are sufficient;

[0083] b) Clean the furnace, furnace cover and hangers, dredge the pipeline and confirm that the pipeline is unimpeded;

[0084] c) Hang the pickled, oil-free and water-stained ring flat and tightly on the hanger with the opening facing upwards;

[0085] d) Slowly hang the hanging ring into the furnace;

[0086] e) Apply a layer of silica gel and clay mixture on the sealing ring, cover the furnace cover and tighten the bolts;

[0087] f) Insert the thermocouple and connect the ammonia gas and waste gas pipelines;

[0088] g) Adjust the waste gas inlet position so that the pressure in the furnace is 700mm water column;

[0089] B. Heating stage:

[0090] a) ...

Embodiment 3

[0102] Nitriding process is:

[0103] (3) Preparations before nitriding: cleaning, drying, pickling, cleaning and drying;

[0104] (4) Nitriding, using an industrial nitriding furnace, using gas nitriding:

[0105] A. Preparation stage:

[0106] a) Check whether ammonia gas, nitrogen gas and desiccant are sufficient;

[0107] b) Clean the furnace, furnace cover and hangers, dredge the pipeline and confirm that the pipeline is unimpeded;

[0108] c) Hang the pickled, oil-free and water-stained ring flat and tightly on the hanger with the opening facing upwards;

[0109] d) Slowly hang the hanging ring into the furnace;

[0110] e) Apply a layer of silica gel and clay mixture on the sealing ring, cover the furnace cover and tighten the bolts;

[0111] f) Insert the thermocouple and connect the ammonia gas and waste gas pipelines;

[0112] g) Adjust the waste gas inlet position so that the pressure in the furnace is 650mm water column;

[0113] B. Heating stage:

[0114] ...

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Abstract

The invention provides a nitriding device for a cast-iron piston ring and a nitriding process thereof, wherein the nitriding device comprises a nitriding furnace, and the nitriding furnace is provided with a nitrogen inlet pipe, an ammonia gas inlet pipe, a mixed gas outlet pipe, a carbon tetrachloride titration device and an indicating device for the pressure inside the furnace; the other end of the mixed gas outlet pipe is connected with a determinator for ammonia dissociation rate. The process comprises: the preparation before nitriding, the preparation period, the temperature-rise period and the temperature-fall period of the nitriding process. The device of the invention has the advantages of reasonable structure, reasonable process flow, simple operation, low production cost, reliable performance of the treated product and further has the advantages of completely meeting client requirements, being applicable to the nitriding of vehicle cast-iron piston rings, gas rings or oil rings, meeting market requirements and having pretty high economic benefit.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of cast iron piston rings, and more specifically relates to a nitriding device and a nitriding process of cast iron piston rings. Background technique [0002] Nitriding is a chemical heat treatment method that infiltrates nitrogen into the surface layer of the piston ring. The purpose is to strengthen the surface of the piston ring, so that the piston ring has: 1. Higher surface hardness and wear resistance; 2. Higher fatigue strength ; 3. Smaller deformation; 4. Higher anti-"occlusion" performance; 5. Improve corrosion resistance. At present, most domestic piston ring manufacturers only carry out nitriding treatment on steel piston rings, and the nitriding process and technology are relatively mature, but they do not know much about the nitriding process and technology of cast iron piston rings, and the products are difficult to satisfy customers. Require. Therefore, providing a novel c...

Claims

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Application Information

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IPC IPC(8): C23C8/26C23C8/02C23G1/08
Inventor 肖信福
Owner HUAMIN NANPING AUTOMOBILE FITTINGS GROUP
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