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Ceramic CBN (cubic boron nitride) grinding wheel for grinding hole seat surface in oil nozzle, manufacturing method and special mould in manufacturing process

A production method and technology of oil injectors, which are applied in the field of grinding wheels, can solve the problems of high mold size and assembly precision, high mold manufacturing cost, and poor weight consistency, so as to achieve stable and consistent grinding performance, improve tissue uniformity, and rough The effect of increasing strength

Active Publication Date: 2014-08-13
ZHENGZHOU RES INST FOR ABRASIVES & GRINDING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, at present, the batch stability of the internal grinding wheel used for the processing of the center hole seat surface of the fuel injection nozzle at home and abroad is poor, and the grinding quality of the workpiece is not easy to control
[0003] At present, the commonly used vitrified bond superhard material grinding wheel is molded, which has high production efficiency, less labor, low scrap rate, short production cycle, and high production efficiency. The range of product density is large, suitable for large, medium and small batch production, but there are disadvantages for micro grinding wheels with extremely small size and weight
Due to the small size and quality of the micro-grinding wheel itself, and high dimensional accuracy requirements, most of the molding materials for vitrified bond superhard material grinding wheels are in the form of powder, and water-soluble methylcellulose aqueous solution, dextrin, and polyethylene are generally used for mixing. Alcohol solution or alcohol-soluble liquid phenolic resin, epoxy resin, urea-formaldehyde resin solution as a wet binder, in the process of weighing and feeding due to the volatilization of volatile components in the wetting binder and the preparation process of molding materials The unavoidable material loss causes the weight consistency of the pressed grinding wheels to be poor between individual and batches. The weight difference of a single grinding wheel can reach about 0.02-0.05g, accounting for 5-25% of the total weight of the grinding wheel, which will Seriously affect the consistency of the grinding performance of the grinding wheel, and have a greater negative effect on the grinding quality and stability of the grinding wheel
Moreover, this type of micro grinding wheel is generally produced in a single mold (that is, one set of molds presses one product at a time), which is inefficient.
However, if multi-mode production is used (that is, one set of molds presses multiple products at one time), the requirements for mold size and assembly accuracy are very high, the cost of mold manufacturing is high, and the production and application of molds are also cumbersome, causing a lot of inconvenience

Method used

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  • Ceramic CBN (cubic boron nitride) grinding wheel for grinding hole seat surface in oil nozzle, manufacturing method and special mould in manufacturing process
  • Ceramic CBN (cubic boron nitride) grinding wheel for grinding hole seat surface in oil nozzle, manufacturing method and special mould in manufacturing process
  • Ceramic CBN (cubic boron nitride) grinding wheel for grinding hole seat surface in oil nozzle, manufacturing method and special mould in manufacturing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The production process is as follows:

[0033] 1) Mixing of grinding wheel molding materials: weigh according to the weight percentage of 20% vitrified bond, 63% cubic boron nitride abrasive, 5% single crystal corundum filler, 6% phenolic resin powder and 6% liquid paraffin wetting agent Each raw material. First, mix cubic boron nitride abrasive and single crystal corundum filler, then add liquid paraffin to wet the abrasive and filler, then add vitrified bond and mix evenly, and finally add phenolic resin powder and mix evenly.

[0034] 2) Hot pressing molding: put the mixed molding material into a special mold, hot pressing molding on a hot pressing machine, hot pressing temperature is 180 ° C, pressure is 32 MPa, heat preservation and pressure holding for 1.5 hours, cooling and unloading the mold, and there are several pieces in the middle. Sand blocks for circular through-holes (see image 3 ).

[0035] 3) Take out a single grinding wheel: taking the center of ea...

Embodiment 2

[0042] The production process is as follows:

[0043] 1) Mixing of grinding wheel molding materials: weighed according to the weight percentage of 22% vitrified bond, 65% cubic boron nitride abrasive, 2% single crystal corundum filler, 5% phenolic resin powder and 6% liquid paraffin wetting agent Each raw material. First, mix cubic boron nitride abrasive and single crystal corundum filler, then add liquid paraffin to wet the abrasive and filler, then add vitrified bond and mix evenly, and finally add phenolic resin powder and mix evenly.

[0044] 2) Hot pressing molding: put the mixed molding material into a special mold, hot pressing molding on a hot pressing machine, the hot pressing temperature is 165 ° C, the pressure is 35 MPa, heat preservation and pressure holding for 1.2 hours, cooling and unloading the mold, and there are several pieces in the middle. A sand block with a circular through hole.

[0045] 3) Take out a single grinding wheel: take the center of each thr...

Embodiment 3～6

[0052]

[0053] Such as making the grinding wheel for center hole grinding, the manufacturing method of the grinding wheel described in Examples 3-6 in Table 3 can refer to Example 1. The special mold used in the making process is the same as embodiment 1. See Table 4 for the grinding effect of the grinding wheel described in Examples 3 to 6 in Table 3.

[0054] Table 4, the grinding effect of grinding wheel and domestic and foreign products of embodiment 3~6 middle hole grinding

[0055]

[0056] For making the grinding wheel for seat surface grinding, the manufacturing method of the grinding wheel described in Examples 3-6 in Table 3 can refer to Example 2. The special-purpose mold used in the production process is the same as embodiment 2. See Table 5 for the grinding effect of the seat surface of the emery wheel described in Examples 3 to 6 in Table 3.

[0057] Table 5 Embodiment 3~6 Grinding effect of grinding wheels for seat surface grinding and products at home...

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Abstract

The invention relates to a ceramic CBN (cubic boron nitride) grinding wheel for grinding a hole seat surface in an oil nozzle. The ceramic CBN grinding wheel is made of the following raw materials in percentage by weight: 10-30% of ceramic bond, 30-83% of CBN, 0-20% of single crystal corundum, 4-20% of phenolic aldehyde resin powder and 3-15% of liquid paraffin. The invention also provides a manufacturing method of the miniature grinding wheel and a special mould in a manufacturing process. After the formula and the manufacturing method disclosed by the invention are adopted for batch production of ceramic CBN miniature grinding wheels (the outer diameters of the grinding wheels are smaller than 5mm and the single weight is smaller than 1g), the production efficiency of the miniature grinding wheels of such kind can be obviously improved, the tissue uniformity is favorably improved, and weight consistency of grinding wheel individuals and grinding wheels in a batch is also ensured, so that the grinding performance of the grinding wheels is kept stable and consistent.

Description

technical field [0001] The invention belongs to the technical field of grinding wheels, and in particular relates to a ceramic cubic boron nitride (CBN) grinding wheel for grinding the hole seat surface of an oil injector, a manufacturing method and a special mold during the manufacturing process. Background technique [0002] The fuel injection system is the heart of the engine, the quality of the fuel injection system directly affects the performance of the engine, and the most important part of the fuel injection system is the nozzle assembly in the injector. Seriously affect the performance of the engine, which is related to the power, economy and operability of the engine, and also involves exhaust gas emissions and mechanical noise. Due to the small diameter and thin thickness of the ceramic cubic boron nitride grinding wheel used for grinding the hole seat surface of the injection nozzle, the weight of a single grinding wheel is very small, about 0.1 to 1g, which belo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24D18/00B24D3/14
Inventor 杨威王志起鲁涛高会强
Owner ZHENGZHOU RES INST FOR ABRASIVES & GRINDING CO LTD
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