CN212451599U - Bearing ring rolling roller die - Google Patents

Abstract

The utility model discloses a bearing ring roller die utensil of rolling. Belongs to the technical field of moulds. The hot-working die mainly solves the technical problems that the existing hot-working die of the bearing rolling roller is easy to cause hot adhesion and thermal fatigue and has short service life. It is mainly characterized in that: including the mould main part, its characterized in that: a white bright layer and an oxide layer are arranged on the surface of the die main body; the white and bright layer is a nitrocarburizing layer attached to the die main body; the oxide layer is attached to the white bright layer. The utility model has the characteristics of long service life, improvement mould main part toughness and surface hardness, lubricated antifriction performance are good and improve mould corrosion resistance, mainly used bearing ring rolls roller die utensil.

Description

Bearing ring rolling roller die

Technical Field

The utility model belongs to the technical field of the mould, a bearing ring rolls roller die utensil is related to, especially a bearing ring rolls roller die utensil that its surface obtains compound protective layer through low temperature nitrocarburizing and isothermal oxidation treatment again on conventional heat treatment's basis.

Background

The bearing is one of the most widely used parts in the mechanical field, and can be divided into a sliding bearing and a rolling bearing, and the rolling bearing has the advantages of small friction coefficient, easy starting, convenient production, low manufacturing cost and the like, so the bearing is widely applied in production practice.

The production of rolling bearing products has been over 100 years old, and the main factors determining the quality and the production cost of the rolling bearing products have a great relationship with the comprehensive performance and the service life of a die.

For a long time, the hot working forging technology is mainly adopted for producing the bearing ring die. The most widely used and most applied is the hot working die mainly made of two materials, namely 3Cr2W8V and H13. The ferrule rolling die is one of the most used and most critical dies.

The rolling die for the bearing ring is in service in severe working environment and working condition. The die is required to have high yield strength and high alternating stress, and also has good comprehensive properties of heat adhesion resistance, thermal fatigue resistance, abrasion resistance and the like.

The conventional heat treatment of the bearing ring rolling die adopts the process that the die made of 3Cr2W8V or H13 materials is heated to 950-1050 ℃ under the condition of vacuum or controlled atmosphere for quenching or isothermal quenching, and then tempering treatment is carried out at 520-600 ℃ under the protective atmosphere, wherein the hardness of a matrix is 46-52 HRC. If the base body of the rolling die for the bearing ring is hard and is greater than 46-52HRC, the die is high in strength, good in wear resistance and long in service life. If the hardness of the die is less than 46-52HRC, the impact toughness of the die is good, the fracture is less, but the die strength is reduced, the die collapse failure is easy to occur, and the service life is very short.

Disclosure of Invention

The utility model aims at providing a bearing ring roller die that obviously improves mould main part toughness and surface hardness, lubricated antifriction performance well and mould life improves by a wide margin to above-mentioned weak point.

The technical solution of the utility model is that: the utility model provides a bearing ring rolls roller mould, includes the mould main part, its characterized in that: a white bright layer and an oxide layer are arranged on the surface of the die main body; the white and bright layer is a nitrocarburizing layer attached to the die main body; the oxide layer is attached to the white bright layer.

The technical solution of the utility model is that the nitrocarbon co-cementation layer is a compound epsilon-Fe₂-3N layers.

The technical solution of the present invention is that the oxide layer is Fe₃O₄A black oxide layer.

The technical solution of the utility model in the mould main part be 3Cr2W8V or H13 mould steel material's mould main part.

The thickness of the white bright layer in the technical solution of the utility model is 6-15 microns.

The surface hardness of the white bright layer in the technical solution of the utility model is HV 700-900.

The utility model discloses because the surface at current mould main part is equipped with bright layer and oxide layer, wherein, bright layer is for adhering to the nitrocarbon oozing layer in the mould main part altogether, the oxide layer is adhered to on bright layer, therefore form scattered sclerosis layer on mould main part surface, not only mould main part intensity does not have obvious reduction, can make its toughness and apparent hardness surface obviously improve on the contrary, the whole strengthening effect with the bright layer that contains compound and the good lubricated antifriction performance of black oxide layer combine together organically, make bearing ring circle compression roller mould more adapt to work under abominable operational environment and the condition, and can full play its good comprehensive properties, be superior to former singly having conventional heat treatment technique and the effect that singly has current surface strengthening technique greatly, good synergy has been gained. The service life of the die can be prolonged by 1-2 times, and the consumption cost of the die is greatly reduced.

The utility model has the characteristics of long service life, improvement mould main part toughness and surface hardness, lubricated antifriction performance are good and improve mould corrosion resistance, mainly used bearing ring rolls roller die utensil.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1-an oxide layer; 2-white bright layer; 3-the mould body.

Detailed Description

In order to illustrate the technical solution of the present invention more clearly, the following describes embodiments of the present invention in further detail.

As shown in fig. 1, an embodiment of the present invention relates to a bearing ring rolling roller die, which comprises a die main body 3, and a white layer 2 and an oxide layer 1 disposed on the surface of the die main body 3 to form a composite layer. The die main body 3 is the existing bearing ring rolling roller die and is made of 3Cr2W8V or H13 die steel.

The white layer 2 is a nitrocarburizing layer adhered and dispersed on the die main body 3, and the nitrocarburizing layer is a compound epsilon-Fe₂-3N layer with thickness of 6-15 microns and surface hardness HV 700-900.

An oxide layer 1 is attached on the bright white layer 2. Oxide layer 1 is Fe₃O₄A black oxide layer.

The utility model discloses bearing ring rolling roller mould adopts low temperature nitrocarburizing + oxidation composite treatment technology to make, including following process steps.

And cleaning and drying the rolling roller die of the bearing ring made of 3Cr2W8V or H13 material, namely the die main body 3 after the mechanical processing and the conventional heat treatment are finished.

The cleaned and dried mould main body 3 is placed into a preheating furnace, and then is subjected to heat preservation for 1 hour at the temperature of 300-350 ℃, so that the preheating aims to prevent the mould from carrying moisture to enter the nitrocarburizing furnace to cause micro-explosion, reduce the temperature difference in the furnace and be beneficial to the generation of a nitrocarburizing layer.

The preheated main body 3 of the die is put into a salt bath furnace containing nitrocarburizing agent, the heat preservation and the cementation treatment are carried out at the temperature of 520 ℃ and 580 ℃ for 2 hours, the main body 3 of the die is taken out by a hoisting tool and stays in the air outside the furnace for a few minutes, the redundant salt bath is filtered out, and the epsilon-Fe is generated₂-3N nitrocarburized layer, i.e. white-bright layer 2, thickness in the range of 6-15 microns and surface hardness in the range of HV 700-900. The alloy elements with high content of Cr, W, V, etc. are easy to form scattered hardening layer on the surface of the mould main body 3 together with N atoms. The low-temperature nitrocarburizing technology has the advantages of low treatment temperature, high surface hardness, small friction coefficient and good lubricating property.

The co-infiltrated and short-time air-cooled mold body 3 is placed into an oxidation furnace with the temperature of 350-380 ℃, and the temperature is kept for 6 to 10 minutes to generate Fe₃O₄A black oxide layer attached on the white layer 2; taking out and putting into an oil groove for cooling, and then cleaning, drying and oiling for later use.

Claims (6)

1. The utility model provides a bearing ring rolls roller die utensil, includes mould main part (3), its characterized in that: a white and bright layer (2) and an oxide layer (1) are arranged on the surface of the die main body (3); the white and bright layer (2) is a nitrocarburizing layer attached to the die main body (3); the oxide layer (1) is attached to the white bright layer (2).

2. The bearing ring rolling roller die according to claim 1, wherein: the nitrocarburizing layer is a compound epsilon-Fe₂-3N layers.

3. The bearing ring rolling roller die according to claim 1, wherein: the oxide layer (1) is Fe₃O₄A black oxide layer.

4. The bearing ring rolling roller die of claim 1, 2 or 3, wherein: the die main body (3) is made of 3Cr2W8V or H13 die steel.

5. The bearing ring rolling roller die of claim 1, 2 or 3, wherein: the thickness of the white bright layer (2) is 6-15 microns.

6. The bearing ring rolling roller die of claim 1, 2 or 3, wherein: the surface hardness of the white and bright layer (2) is HV 700-900.

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