CN103433825B - The control method of a kind of aero-engine carburized gears grinding burn - Google Patents

Abstract

The present invention relates to the control method of a kind of aero-engine carburized gears grinding burn.The present invention considers that the temperature that grinding produces is the main cause causing gear grinding to burn, and determines that the key of the new control method of aero-engine carburized gears grinding burn is: in gear manufacturing processes, conservative control grinding thermal source.The method comprising the steps of: the concrete technology parameter of each step in corase grind-half this process route of fine grinding-fine grinding-super grinding, and result shows to use new control method by experiment, and aero-engine carburized gears surface has no grinding burn.Compared with former control method: the positive revesal mill amount in the present invention reduces, and not easily produces a large amount of grinding heats; Cooling fluid viscosity reduce, its cooling and developing result better.

Description

The control method of a kind of aero-engine carburized gears grinding burn

Technical field

The present invention relates to the control method of a kind of aero-engine carburized gears grinding burn.

Background technology

Grinding burn refers to because TRANSIENT HIGH TEMPERATURE during grinding makes workpiece surface local organization change, and the hardness of piece surface is reduced, and occurs the phenomenon of oxidation stain in some part of surface of the work.Grinding burn can reduce the wearability of material, corrosion resistance and fatigue strength.

The basic reason of grinding burn is the Grinding superheat that grinding produces instantaneously, and the principal element of grinding burn is the generation of grinding heat and spreading out of of grinding heat, and the generation of grinding heat is emery wheel and grinding parameter, and spreading out of of grinding heat is controlled by cutting fluid and cooling.

Before improvement, the control of grinding burn is by frequently changing cutting fluid, improves the cooling effectiveness of carburized gears.This control method can not eliminate grinding burn completely, cause carburized gears performance reduce and repeat to reprocess, more seriously cause carburized gears to be scrapped, extend the manufacturing cycle, add manufacturing cost, the development work of restriction aero-engine model, affects production payment task.

Summary of the invention

The object of this invention is to provide the control method of a kind of aero-engine carburized gears grinding burn, overcome prior art and there is properties of product instability, qualification rate is low and the workpiece manufacturing cycle is long, manufacturing cost is high deficiency.

The mechanism that first the present invention analyzes aero-engine carburized gears grinding burn generation is as follows:

When grinding area temperature is significantly beyond steel belt roof bolt temperature, but still during lower than phase transition temperature, there is secondary troostite or tempered sorbite softening tissue in workpiece surface; When grinding area temperature exceedes the phase transition temperature AC1 of steel, workpiece surface regional area will become austenite, being subject to the cooling effect rapidly of cooling fluid and workpiece self heat conduction subsequently and in workpiece surface, occurring secondary quenching marten siting, there is tempered sorbite in secondary top layer.

To sum up, the present invention considers that the temperature that grinding produces is the main cause causing gear grinding to burn, and determines that the key of the new control method of aero-engine carburized gears grinding burn is: in gear manufacturing processes, conservative control grinding thermal source.

Therefore, technical scheme of the present invention is: the control method of a kind of aero-engine carburized gears grinding burn, specifically comprises the steps:

Step one: corase grind, optimum configurations is: grinding modification amount 0.02mm/ time, positive stroke mill amount 0.008mm, positive stroke feed rate 1800mm/min, revesal mill amount 0.008mm, revesal feed rate 1800mm/min, grinding speed 25m/min, every grinding 1 time, balance emery wheel and throwing is repaiied, cooling fluid is Castrol 600HC;

Step 2: half fine grinding, optimum configurations is: grinding modification amount 0.01mm/ time, positive stroke mill amount 0.008mm, positive stroke feed rate 1800mm/min, revesal mill amount 0.008mm, revesal feed rate 1800mm/min, grinding speed 25m/min, every grinding 1 time, balance emery wheel and throwing is repaiied, cooling fluid is Castrol 600HC;

Step 3: fine grinding, optimum configurations is: grinding modification amount 0.01mm/ time, positive stroke mill amount 0.008mm, positive stroke feed rate 1200mm/min, revesal mill amount 0.008mm, revesal feed rate 1200mm/min, grinding speed 25m/min, every grinding 1 time, balance emery wheel and throwing is repaiied, cooling fluid is Castrol 600HC;

Step 4: super grinding, optimum configurations is: grinding modification amount 0.005mm/ time, positive stroke mill amount 0.005mm, positive stroke feed rate 600mm/min, revesal mill amount 0.005mm, revesal feed rate 1200mm/min, grinding speed 25m/min, every grinding 1 time, balance emery wheel and throwing is repaiied, cooling fluid is Castrol 600HC.

Beneficial effect of the present invention: use new control method, aero-engine carburized gears surface has no grinding burn.Compared with former control method: the positive revesal mill amount in the present invention reduces, and not easily produces a large amount of grinding heats; Cooling fluid viscosity reduce, its cooling and developing result better.

Detailed description of the invention:

By contrasting improving front and after improving method for grinding in the present embodiment, embody the validity of the method proposed in the present invention.

Grinding parameter before improvement is in table 1, and the grinding parameter after improvement is in table 2, and the cooling fluid parameter before and after improving is in table 3.

Grinding parameter before table 1 improves

Grinding parameter after table 2 improves

Cooling fluid parameter before and after table 3 improves

After improvement, carry out contrast test from grinding parameter and cooling fluid two aspect, determine that the method for the present embodiment can effectively control carburized gears grinding burn.

Claims (1)

1. a control method for aero-engine carburized gears grinding burn, specifically comprises the steps:

Step one: corase grind, optimum configurations is: grinding modification amount 0.02mm/ time, positive stroke mill amount 0.008mm, positive stroke feed rate 1800mm/min, revesal mill amount 0.008mm, revesal feed rate 1800mm/min, grinding speed 25m/min, every grinding 1 time, balance emery wheel and throwing is repaiied, cooling fluid is Castrol 600HC;

Step 2: half fine grinding, optimum configurations is: grinding modification amount 0.01mm/ time, positive stroke mill amount 0.008mm, positive stroke feed rate 1800mm/min, revesal mill amount 0.008mm, revesal feed rate 1800mm/min, grinding speed 25m/min, every grinding 1 time, balance emery wheel and throwing is repaiied, cooling fluid is Castrol 600HC;

Step 3: fine grinding, optimum configurations is: grinding modification amount 0.01mm/ time, positive stroke mill amount 0.008mm, positive stroke feed rate 1200mm/min, revesal mill amount 0.008mm, revesal feed rate 1200mm/min, grinding speed 25m/min, every grinding 1 time, balance emery wheel and throwing is repaiied, cooling fluid is Castrol 600HC;

Step 4: super grinding, optimum configurations is: grinding modification amount 0.005mm/ time, positive stroke mill amount 0.005mm, positive stroke feed rate 600mm/min, revesal mill amount 0.005mm, revesal feed rate 1200mm/min, grinding speed 25m/min, every grinding 1 time, balance emery wheel and throwing is repaiied, cooling fluid is Castrol 600HC.