Ceramic cbn grinding wheel for grinding the seat surface of the center hole of the fuel injection nozzle, its manufacturing method and a special mold in the manufacturing process

A manufacturing method and a technology for injecting nozzles, applied in the field of grinding wheels, can solve the problems of high mold size and assembly accuracy, high mold manufacturing cost, poor weight consistency, etc., and achieve stable and consistent grinding performance, improve organizational uniformity, and roughness. Strength boosting effect

Active Publication Date: 2016-05-11
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 grinding wheel for grinding the seat surface of the center hole of the fuel injection nozzle, its manufacturing method and a special mold in the manufacturing process
  • Ceramic cbn grinding wheel for grinding the seat surface of the center hole of the fuel injection nozzle, its manufacturing method and a special mold in the manufacturing process
  • Ceramic cbn grinding wheel for grinding the seat surface of the center hole of the fuel injection nozzle, its manufacturing method and a special mold in the manufacturing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Grinding wheel for center hole grinding, grinding wheel specification: 1A1W4×6×2×16.5×M2CBN325 / 400.

[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 c...

Embodiment 2

[0041]Grinding wheel for seat surface grinding, grinding wheel specification: 1A1W3.3×10.5×2×21.6×M2CBN325 / 400.

[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 ...

Embodiment 3～6

[0051] Each raw material weight percentage of emery wheel described in table 3 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...

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Abstract

The invention relates to a ceramic CBN grinding wheel for grinding the center hole seat surface of an oil injector, which is made of the following raw materials in weight percentage: 10-30% ceramic bond, 30-83% cubic boron nitride, 0-20% Single crystal corundum, 4-20% phenolic resin powder and 3-15% liquid paraffin. The present invention also provides the manufacturing method of the above-mentioned micro-grinding wheel and the special mold in the manufacturing process. Batch production of ceramic CBN micro grinding wheels (the outer diameter of the grinding wheel is less than 5mm, and the unit weight is less than 1g) by adopting the formula and production method described in the present invention can significantly improve the production efficiency of this type of micro grinding wheel, which is conducive to improving the uniformity of the structure and ensuring the grinding wheel at the same time The weight consistency between single and batches, so that the grinding performance of the grinding wheel remains 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 Patents(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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