阅读说明：本技术 一种树脂基无心磨砂轮的制备方法 (Preparation method of resin-based centerless grinding wheel ) 是由 张光宇 王凯平 于 2018-06-21 设计创作，主要内容包括：本发明公开了一种树脂基无心磨砂轮的制备方法,将树脂粉与添加物热压、硬化制备胶木基体；搅拌下,将磨料润湿剂加入磨料中,然后再加入树脂结合剂,混合30～60min,制备磨料混合物；所述树脂结合剂的制备为,将酚醛树脂粉、铜锡合金6040、碳化硅、冰晶石、氧化铬混合2～2.5h,得到树脂结合剂；将胶木基体、磨料混合物加压成型,得到树脂砂轮；将复数片树脂砂轮组合,得到树脂基无心磨砂轮。采用树脂胶木基体,基体材料与超硬磨料层的主要成分均为高分子材料,增大了磨料层与基体之间的粘结力。同时树脂基无心磨砂轮在使用过程中具有一定的弹性,有效的提高了磨削工件的光洁度。本发明结构简单,便于推广。(The invention discloses a method for preparing a resin-based centerless grinding wheel, which comprises the steps of hot-pressing and hardening resin powder and additives to prepare a bakelite matrix; adding an abrasive wetting agent into an abrasive under stirring, then adding a resin bonding agent, and mixing for 30-60 min to prepare an abrasive mixture; the preparation method of the resin bonding agent comprises the following steps of mixing phenolic resin powder, copper-tin alloy 6040, silicon carbide, cryolite and chromium oxide for 2-2.5 hours to obtain the resin bonding agent; pressurizing and molding the bakelite matrix and the abrasive material mixture to obtain a resin grinding wheel; and combining a plurality of resin grinding wheels to obtain the resin-based centerless grinding wheel. The resin bakelite matrix is adopted, and the matrix material and the main components of the superhard abrasive layer are polymer materials, so that the binding power between the abrasive layer and the matrix is increased. Meanwhile, the resin-based centerless grinding wheel has certain elasticity in the use process, and the smoothness of a ground workpiece is effectively improved. The invention has simple structure and is convenient for popularization.)

1. The preparation method of the resin-based centerless grinding wheel is characterized by comprising the following steps of:

(1) hot pressing and hardening the resin powder and the additives to prepare a bakelite matrix; adding an abrasive wetting agent into an abrasive under stirring, then adding a resin bonding agent, and mixing for 30-60 min to prepare an abrasive mixture; the preparation method of the resin bonding agent comprises the following steps of mixing phenolic resin powder, copper-tin alloy 6040, silicon carbide, cryolite and chromium oxide for 2-2.5 hours to obtain the resin bonding agent;

(2) pressurizing and molding the bakelite matrix and the abrasive material mixture to obtain a resin grinding wheel;

(3) and combining a plurality of resin grinding wheels to obtain the resin-based centerless grinding wheel.

2. The method for preparing the resin-based centerless grinding wheel according to claim 1, characterized in that: the additive is glass fiber or carbon fiber which is subjected to surface treatment by a coupling agent; the resin powder is one or a combination of more of phenolic resin powder, epoxy resin powder and polyimide resin powder; the thickness of the resin grinding wheel is 30-50 mm, and the outer diameter is 150-450 mm.

3. The method for preparing the resin-based centerless grinding wheel according to claim 1, characterized in that: the hot pressing temperature is 150 ℃, and the time is 2 hours; the hardening temperature is 140-160 ℃, and the time is 10 h; roughening or knurling the excircle of the bakelite matrix; the pressure forming temperature is 130-150 ℃, the pressure is 100-150 tons, and the time is 1.5-2.5 h; the resin grinding wheels are combined in a bonding and/or bolt fastening mode.

4. A preparation method of a resin grinding wheel for a resin-based centerless grinding wheel is characterized by comprising the following steps:

(1) hot pressing and hardening the resin powder and the additives to prepare a bakelite matrix; adding an abrasive wetting agent into an abrasive under stirring, then adding a resin bonding agent, and mixing for 30-60 min to prepare an abrasive mixture; the preparation method of the resin bonding agent comprises the following steps of mixing phenolic resin powder, copper-tin alloy 6040, silicon carbide, cryolite and chromium oxide for 2-2.5 hours to obtain the resin bonding agent;

(2) and (3) pressurizing and molding the bakelite matrix and the abrasive material mixture to obtain the resin grinding wheel.

5. The method for manufacturing a resin grinding wheel for a resin-based centerless grinding wheel according to claim 4, characterized in that: the additive is glass fiber or carbon fiber which is subjected to surface treatment by a coupling agent; the resin powder is one or a combination of more of phenolic resin powder, epoxy resin powder and polyimide resin powder; the hot pressing temperature is 150 ℃, and the time is 2 hours; the hardening temperature is 140-160 ℃, and the time is 10 h; the thickness of the resin grinding wheel is 30-50 mm, and the outer diameter is 150-450 mm; the pressure forming temperature is 130-150 ℃, the pressure is 100-150 tons, and the time is 1.5-2.5 h.

Technical Field

The invention relates to a resin-based centerless grinding wheel, and belongs to the technical field of centerless grinding wheel preparation.

Background

Centerless grinding is generally performed on a centerless grinding machine, and during grinding, a workpiece is not centered and supported by a tip, but is placed between a grinding wheel and a guide wheel, supported by a supporting plate below the grinding wheel and driven to rotate by the guide wheel. In the prior art of preparing a centerless grinding wheel, the centerless grinding wheel is generally formed by using an aluminum alloy rod or an aluminum alloy plate as a substrate, turning the substrate, then hot-pressing an ultrahard grinding material layer, and then assembling a plurality of sheets.

Because the centerless grinding wheel is generally large in size, an aluminum alloy rod or an aluminum alloy plate is used as a base body, and although the mass of the centerless grinding wheel is lighter than that of a steel base body, the whole mass of the grinding wheel is still heavier; meanwhile, the superhard abrasive layer is poorly bonded with the surface of the aluminum alloy substrate by hot pressing, so that the grinding wheel has poor processing efficiency and service life.

Disclosure of Invention

The invention aims to provide a light resin matrix for a centerless grinding wheel, which is used for the first time, so that the weight of the grinding wheel is greatly reduced, and meanwhile, the application properties of the grinding wheel, such as strength and stability, are maintained.

In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:

a resin-based centerless grinding wheel comprises a plurality of resin grinding wheels; the resin grinding wheel comprises a bakelite base body and an abrasive layer; the bakelite matrix is prepared by hot pressing and hardening resin powder and additives.

In the technical scheme, the additive is glass fiber or carbon fiber subjected to surface treatment by a coupling agent; the resin powder is one or a combination of more of phenolic resin powder, epoxy resin powder and polyimide resin powder; the thickness of the resin grinding wheel is 30-50 mm, and the outer diameter is 150-450 mm.

In the technical scheme, the hot pressing temperature is 150 ℃, and the time is 2 hours; the hardening temperature is 140-160 ℃, and the time is 10 h; the resin grinding wheels are combined in a bonding and/or bolt fastening mode.

The invention also discloses a preparation method of the resin matrix for the resin-based centerless grinding wheel, which comprises the following steps of hot-pressing and hardening the resin powder and the additives to prepare the bakelite matrix, namely the resin matrix for the resin-based centerless grinding wheel.

The invention also discloses a preparation method of the resin grinding wheel for the resin-based centerless grinding wheel, which comprises the following steps:

(1) hot pressing and hardening the resin powder and the additives to prepare a bakelite matrix; adding an abrasive wetting agent into an abrasive under stirring, then adding a resin bonding agent, and mixing for 30-60 min to prepare an abrasive mixture; the preparation method of the resin bonding agent comprises the following steps of mixing phenolic resin powder, copper-tin alloy 6040, silicon carbide, cryolite and chromium oxide for 2-2.5 hours to obtain the resin bonding agent;

(2) and (3) pressurizing and molding the bakelite matrix and the abrasive material mixture to obtain the resin grinding wheel.

In the technical scheme, the additive is glass fiber or carbon fiber subjected to surface treatment by a coupling agent; the resin powder is one or a combination of more of phenolic resin powder, epoxy resin powder and polyimide resin powder; the hot pressing temperature is 150 ℃, and the time is 2 hours; the hardening temperature is 140-160 ℃, and the time is 10 h; the pressure forming temperature is 130-150 ℃, the pressure is 100-150 tons, and the time is 1.5-2.5 h.

The invention also discloses a preparation method of the resin-based centerless grinding wheel, which comprises the following steps:

(1) hot pressing and hardening the resin powder and the additives to prepare a bakelite matrix; adding an abrasive wetting agent into an abrasive under stirring, then adding a resin bonding agent, and mixing for 30-60 min to prepare an abrasive mixture; the preparation method of the resin bonding agent comprises the following steps of mixing phenolic resin powder, copper-tin alloy 6040, silicon carbide, cryolite and chromium oxide for 2-2.5 hours to obtain the resin bonding agent;

(2) pressurizing and molding the bakelite matrix and the abrasive material mixture to obtain a resin grinding wheel;

(3) and combining a plurality of resin grinding wheels to obtain the resin-based centerless grinding wheel.

In the technical scheme, the additive is glass fiber or carbon fiber subjected to surface treatment by a coupling agent; the resin powder is one or a combination of more of phenolic resin powder, epoxy resin powder and polyimide resin powder; the thickness of the resin grinding wheel is 30-50 mm, and the outer diameter is 150-450 mm.

In the technical scheme, the hot pressing temperature is 150 ℃, and the time is 2 hours; the hardening temperature is 140-160 ℃, and the time is 10 h; the plurality of resin grinding wheels are combined in a bonding and/or bolt fastening mode; roughening or knurling the excircle of the bakelite matrix; the pressure forming temperature is 130-150 ℃, the pressure is 100-150 tons, and the time is 1.5-2.5 h.

In the technical scheme, the mass ratio of the phenolic resin powder to the copper-tin alloy 6040 to the silicon carbide to the cryolite to the chromium oxide is (20-40) to (30-40) to (15-24) to (2-5) to (2-8); the mass ratio of the abrasive wetting agent to the abrasive to the resin bonding agent is (1-3) to 100 to (80-120); the abrasive wetting agent is a coupling agent, and the abrasive is a diamond abrasive.

The resin-based centerless grinding wheel disclosed by the invention has the advantages that a centerless grinding matrix is a bakelite matrix which is subjected to one-step hot press hardening by adopting resin powder and glass fiber or carbon fiber subjected to surface treatment by a coupling agent, and the resin powder is one or a combination of more of phenolic resin powder, epoxy resin powder and polyimide resin powder; preferably, the bakelite matrix is formed by one-time hot press molding, hardening through an oven and then lathing.

The resin-based centerless grinding wheel disclosed by the invention comprises a plurality of resin grinding wheels, wherein the resin grinding wheels are assembled and combined to obtain a finished product; according to the invention, the aluminum alloy matrix of the centerless grinding wheel is changed into the resin bakelite matrix for the first time, so that the weight is reduced by 1/3-2/3;

the resin bakelite matrix is adopted, and the matrix material and the main components of the superhard abrasive layer are high molecular materials, so that the binding force between the abrasive layer and the matrix is increased;

the resin bakelite matrix is adopted, so that the centerless grinding wheel has certain elasticity in the use process, and the smoothness of a ground workpiece is effectively improved;

the invention has simple structure and is convenient for popularization.

Detailed Description

The invention is further described below with reference to the following examples:

the preparation method of the resin-based centerless grinding wheel comprises the following steps:

(1) hot pressing and hardening the resin powder and the additives to prepare a bakelite matrix;

preparing a resin binder: weighing raw materials, wherein the mass ratio of the raw materials to the phenolic resin powder to the copper-tin alloy 6040 to the silicon carbide to the cryolite to the chromium oxide is (20-40) to (30-40) to (15-24) to (2-5) to (2-8), respectively putting the components of a resin binder into a three-dimensional mixer, mixing for 2-2.5 hours, and uniformly mixing to obtain the binder for later use;

preparing an abrasive mixture: the mass ratio of the abrasive wetting agent to the abrasive to the resin bonding agent is (1-3) to 100 to (80-120), and the method comprises the following steps: dropwise adding a wetting agent into the stirred abrasive, adding a bonding agent after the surface of the abrasive is wetted, and putting the abrasive and the bonding agent into a three-dimensional mixer together for mixing for 30-60 min to prepare an abrasive mixture;

(2) turning a bakelite matrix into a required shape, roughening or knurling the excircle of the bakelite matrix, adding an abrasive mixture, and performing hot press molding by using a die press head at the temperature of 130-150 ℃ under the pressure of 100-150 tons for 1.5-2.5 hours to obtain a resin grinding wheel;

(3) and combining a plurality of resin grinding wheels to obtain the resin-based centerless grinding wheel.