A honing rod metal binder composed of metal powders of different particle sizes and a manufacturing method thereof

Abstract

The invention discloses a honing bar metal binder composed of metal powders of different particle sizes and a preparation method thereof. The honing bar metal binder consists of the following raw materials in percentage by weight: 50-80% copper, 10%-30% tin, 5%-15% cobalt, and 3%-7% silver. The particle sizes of the raw materials in the binder are various, and the particle sizes range between 200-800 meshes. The honing bar metal binder and abrasive are evenly mixed in proportion and then formed into a honing bar by a hot pressing and sintering process. The prepared honing bar has a long processing life and good parameter stability.

Description

Technical Field

[0001] The invention relates to the technical field of metal binder preparation, in particular to a honing bar metal binder composed of metal powders of different particle sizes and a preparation method thereof. Background Art

[0002] Honing bars are strip-shaped bonded abrasive tools made of abrasives and binders, which are embedded in the honing head to perform finishing on the finished surface. The binder is used to bond many fine abrasive grains together to give the abrasive tool a certain shape and necessary strength. During grinding, the abrasive grains can cut the workpiece with the support of the binder. When the abrasive grains are blunt, they can also be broken or fallen off in time to expose new abrasive grains to continue working and maintain the good cutting performance of the honing bar.

[0003] In the prior art, metal powder with a single particle size is often used as the metal binder for preparing honing bars. The selection of such a single particle size metal cannot fully meet the market demand. For example, for the processing of cast iron cylinder bore series products, the workpiece hardness is HB207-277, the material is cast iron HT250, the mesh requirements are RZ2-5, RPK0-0.3, RK0.2-0.8, RVK0.8-2.4, and the metal binder made of metal powder with a single particle size of 200-300 meshes has a coarser particle size, which will reduce the density and strength of the honing bars, resulting in a short life of the honing bars. The metal binder made of metal powder with a single particle size of 600-800 meshes has a finer particle size and poor fluidity, which affects the density and hardness of the honing bars. The life of the honing bars can be increased during the processing, but the parameters are unstable and they are easily scratched.

[0004] Therefore, it is necessary to develop a honing bar metal bond to improve the preparation of honing bars with long service life and good parameter stability. Summary of the invention

[0005] In view of the above situation, the purpose of the present invention is to provide a honing rod metal binder made of metal powders of different particle sizes from 200 mesh to 800 mesh, which are mixed in a certain proportion and used to prepare honing rods, thereby improving the processing life and ensuring parameter stability.

[0006] The technical solution is:

[0007] A honing stick metal binder composed of metal powders of different particle sizes, the honing stick metal binder is composed of the following raw materials in weight percentage: 50-80% copper, 10%-30% tin, 5%-15% cobalt, 3%-7% silver, and the particle sizes of the raw materials in the binder are various, and the particle sizes range between 200-800 meshes.

[0008] Furthermore, the honing bar metal bond and abrasive are used together to prepare the honing bar, and the abrasive content is 6.25%-25% of the volume of the bond, corresponding to a concentration of 25-100%.

[0009] Furthermore, the abrasive is diamond or cubic boron nitride, and the particle size of the abrasive is in the range of 200 mesh to 800 mesh.

[0010] Preferably, the honing rod metal bond is composed of the following raw materials in weight percentage: 60% copper, 25% tin, 10% cobalt, and 5% silver. The weight ratio of 800 mesh copper: 400 mesh copper: 200 mesh copper in the copper is 18:18:24, the weight ratio of 800 mesh tin: 400 mesh tin: 200 mesh tin in the tin is 7.5:7.5:10, the weight ratio of 800 mesh cobalt: 400 mesh cobalt: 200 mesh cobalt in the cobalt is 3:2:5, the weight ratio of 800 mesh silver: 400 mesh silver: 200 mesh silver in the silver is 1.5:1.5:2, the abrasive content is 18.75% of the volume of the bond, the corresponding concentration is 75%, and the particle size of the abrasive is 400 mesh.

[0011] Furthermore, the honing stick is prepared by the following method: the binder and the abrasive are mixed evenly in proportion and then formed by a hot pressing sintering process, wherein the sintering hot pressing process comprises the following steps:

[0012] (1) Temperature and pressure increase stage: within 1-6 minutes, the temperature is increased to 400°C and the pressure is increased to 75KN;

[0013] (2) Temperature rising and pressure holding stage: within 6-12 minutes, the temperature rises to 850°C and the pressure is maintained at 75KN;

[0014] (3) Heat preservation and pressure preservation stage: within 12-20 minutes, the temperature is maintained at 850°C and the pressure is maintained at 75KN;

[0015] (4) Cooling and pressure holding stage: Within 20-24 minutes, the temperature drops to 400°C and the pressure is maintained at 75KN.

[0016] Due to the adoption of the above technical solution, the present invention has the following advantages compared with the prior art:

[0017] 1. By improving the metal binder formula of the honing rod, metal powders of different particle sizes are used and sintered with copper / tin / cobalt / silver as the main components to form a high-performance binder combined with an alloy. The prepared honing rod has both self-sharpening and wear resistance, and stable processing.

[0018] 2. Based on the metal binder composed of hard rigid abrasive grains and metal powders of different particle sizes, by controlling the raw material ratio, sintering temperature gradient, insulation time and insulation pressure, the final honing stick has a long processing life, good parameter stability, and the processing accuracy and roughness can meet the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a specific embodiment of the sintering hot pressing process of the present invention. DETAILED DESCRIPTION

[0020] The above and other technical contents, features and effects of the present invention are described in detail below with reference to the attached Figure 1 The detailed description of the embodiments will clearly show that the structural contents mentioned in the following embodiments are all based on the drawings in the specification.

[0021] Example 1

[0022] A honing rod metal binder composed of metal powders of different particle sizes, the honing rod metal binder is composed of the following raw materials in weight percentage: 68% copper, 12% tin, 15% cobalt, and 5% silver, the weight ratio of 700 mesh copper: 450 mesh copper: 200 mesh copper in the copper is 18:16:21, the weight ratio of 700 mesh tin: 450 mesh tin: 200 mesh tin in the tin is 8:8:9, the weight ratio of 700 mesh cobalt: 450 mesh cobalt: 200 mesh cobalt in the cobalt is 7:5:3, and the weight ratio of 700 mesh silver: 450 mesh silver: 200 mesh silver in the silver is 2:2:1;

[0023] The honing bar metal bond and abrasive are used together to prepare the honing bar. The abrasive content is 12.5% ​​of the volume of the bond, corresponding to a concentration of 50%. The abrasive is cubic boron nitride, and the particle size of the abrasive is 800 meshes.

[0024] The honing stick is prepared by the following method: a binder and an abrasive are mixed uniformly in proportion and then formed by a hot pressing sintering process, wherein the sintering hot pressing process comprises the following steps:

[0025] (1) Temperature and pressure increase stage: within 1-6 minutes, the temperature is increased to 400°C and the pressure is increased to 75KN;

[0026] (2) Temperature rising and pressure holding stage: within 6-12 minutes, the temperature rises to 850°C and the pressure is maintained at 75KN;

[0027] (3) Heat preservation and pressure preservation stage: within 12-20 minutes, the temperature is maintained at 850°C and the pressure is maintained at 75KN;

[0028] (4) Cooling and pressure holding stage: Within 20-24 minutes, the temperature drops to 400°C and the pressure is maintained at 75KN.

[0029] Example 2

[0030] A honing rod metal binder composed of metal powders of different particle sizes, the honing rod metal binder is composed of the following raw materials in weight percentage: 65% copper, 15% tin, 13% cobalt, and 7% silver, the weight ratio of 800 mesh copper: 500 mesh copper: 200 mesh copper in the copper is 20:20:25, the weight ratio of 800 mesh tin: 500 mesh tin: 200 mesh tin in the tin is 5:5:5, the weight ratio of 800 mesh cobalt: 500 mesh cobalt: 200 mesh cobalt in the cobalt is 4:3:6, and the weight ratio of 800 mesh silver: 500 mesh silver: 200 mesh silver in the silver is 2:2:3;

[0031] The honing bar metal binder and abrasive are used together to prepare the honing bar. The abrasive content is 20% of the binder volume, corresponding to a concentration of 80%. The abrasive is diamond, and the particle size of the abrasive is 600 meshes.

[0032] The honing stick is prepared by the following method: a binder and an abrasive are mixed uniformly in proportion and then formed by a hot pressing sintering process, wherein the sintering hot pressing process comprises the following steps:

[0033] (1) Temperature and pressure increase stage: within 1-6 minutes, the temperature is increased to 400°C and the pressure is increased to 75KN;

[0034] (2) Temperature rising and pressure holding stage: within 6-12 minutes, the temperature rises to 850°C and the pressure is maintained at 75KN;

[0035] (3) Heat preservation and pressure preservation stage: within 12-20 minutes, the temperature is maintained at 850°C and the pressure is maintained at 75KN;

[0036] (4) Cooling and pressure holding stage: Within 20-24 minutes, the temperature drops to 400°C and the pressure is maintained at 75KN.

[0037] Example 3

[0038] A honing rod metal binder composed of metal powders of different particle sizes, the honing rod metal binder is composed of the following raw materials in weight percentage: 65% copper, 12% tin, 18% cobalt, and 5% silver, the weight ratio of 800 mesh copper: 500 mesh copper: 250 mesh copper in the copper is 15:15:20, the weight ratio of 800 mesh tin: 500 mesh tin: 250 mesh tin in the tin is 9:9:12, the weight ratio of 800 mesh cobalt: 500 mesh cobalt: 250 mesh cobalt in the cobalt is 5:5:6, and the weight ratio of 800 mesh silver: 500 mesh silver: 250 mesh silver in the silver is 1:1:2;

[0039] The honing bar metal binder and abrasive are used together to prepare the honing bar. The abrasive content is 24% of the binder volume, corresponding to a concentration of 96%. The abrasive is diamond, and the particle size of the abrasive is 200 meshes.

[0040] The honing stick is prepared by the following method: a binder and an abrasive are mixed uniformly in proportion and then formed by a hot pressing sintering process, wherein the sintering hot pressing process comprises the following steps:

[0041] (1) Temperature and pressure increase stage: within 1-6 minutes, the temperature is increased to 400°C and the pressure is increased to 75KN;

[0042] (2) Temperature rising and pressure holding stage: within 6-12 minutes, the temperature rises to 850°C and the pressure is maintained at 75KN;

[0043] (3) Heat preservation and pressure preservation stage: within 12-20 minutes, the temperature is maintained at 850°C and the pressure is maintained at 75KN;

[0044] (4) Cooling and pressure holding stage: Within 20-24 minutes, the temperature drops to 400°C and the pressure is maintained at 75KN.

[0045] Example 4

[0046] A honing rod metal binder composed of metal powders of different particle sizes, the honing rod metal binder is composed of the following raw materials in weight percentage: 60% copper, 25% tin, 10% cobalt, and 5% silver, the weight ratio of 800 mesh copper: 400 mesh copper: 200 mesh copper in the copper is 18:18:24, the weight ratio of 800 mesh tin: 400 mesh tin: 200 mesh tin in the tin is 7.5:7.5:10, the weight ratio of 800 mesh cobalt: 400 mesh cobalt: 200 mesh cobalt in the cobalt is 3:2:5, and the weight ratio of 800 mesh silver: 400 mesh silver: 200 mesh silver in the silver is 1.5:1.5:2;

[0047] The honing bar metal bond and abrasive are used together to prepare the honing bar. The abrasive content is 18.75% of the bond volume, corresponding to a concentration of 75%. The abrasive is cubic boron nitride, and the particle size of the abrasive is 400 meshes.

[0048] The honing stick is prepared by the following method: a binder and an abrasive are mixed uniformly in proportion and then formed by a hot pressing sintering process, wherein the sintering hot pressing process comprises the following steps:

[0049] (1) Temperature and pressure increase stage: within 1-6 minutes, the temperature is increased to 400°C and the pressure is increased to 75KN;

[0050] (2) Temperature rising and pressure holding stage: within 6-12 minutes, the temperature rises to 850°C and the pressure is maintained at 75KN;

[0051] (3) Heat preservation and pressure preservation stage: within 12-20 minutes, the temperature is maintained at 850°C and the pressure is maintained at 75KN;

[0052] (4) Cooling and pressure holding stage: Within 20-24 minutes, the temperature drops to 400°C and the pressure is maintained at 75KN.

[0053] Comparative Example 1

[0054] The same as Example 4, except that the particle size of the copper, tin, cobalt and silver is 800 mesh.

[0055] Comparative Example 2

[0056] The same as Example 4, the only difference is that the particle size of the copper, tin, cobalt and silver is 200 mesh.

[0057] Performance Test:

[0058] (1) The honing bars prepared in Examples 1-4 and Comparative Example 1 were tested for processing life and parameter stability. The results are shown in Table 1:

[0059] Table 1 Processing life Parameter stability Example 1 5780 items Stablize Example 2 5680 items Stablize Example 3 5450 items Stablize Example 4 5000 pieces Stablize Comparative Example 1 5100 items Parameters fluctuate Comparative Example 2 2000 items Parameters fluctuate

[0060] It can be seen from Table 1 that, compared with Comparative Examples 1 and 2, the honing bars prepared in Examples 1-3 have a long processing life and stable parameters during use.

[0061] (2) The honing results of the honing bars prepared in Examples 1-4 and Comparative Examples 1-2 are shown in Table 2:

[0062]

[0063] It can be seen from Table 2 that the parameters of the honing bars prepared by the honing bar metal binder of the present invention can meet the requirements, and are more stable and have smaller changes than the parameters of Comparative Examples 1-2.

[0064] The above is a further detailed description of the present invention in combination with a specific implementation method, and it cannot be determined that the specific implementation of the present invention is limited to this; for technical personnel in the technical field to which the present invention belongs and related technical fields, based on the technical solution of the present invention, the expansion and replacement of operating methods and data should all fall within the protection scope of the present invention.

Claims

1. A honing stick metal bond composed of metal powders of different particle sizes, characterized in that: The honing rod metal binder is composed of the following raw materials in weight percentage: 50-80% copper, 10%-30% tin, 5%-15% cobalt, and 3%-7% silver. The particle sizes of the raw materials in the binder are various, and the particle size range is between 200-800 meshes; wherein the weight ratio of 700 mesh copper: 450 mesh copper: 200 mesh copper in the copper is 18:16:21, and the weight ratio of 700 mesh tin: 450 mesh tin: 200 mesh tin in the tin is 8:8:9 The weight ratio of 700 mesh cobalt: 450 mesh cobalt: 200 mesh cobalt in the cobalt is 7:5:3, the weight ratio of 700 mesh silver: 450 mesh silver: 200 mesh silver in the silver is 2:2:1; or the weight ratio of 800 mesh copper: 500 mesh copper: 200 mesh copper in the copper is 20:20:25, the weight ratio of 800 mesh tin: 500 mesh tin: 200 mesh tin in the tin is 5:5:5, the weight ratio of 800 mesh cobalt: 500 mesh cobalt: 200 mesh cobalt in the cobalt is 2:2:1; The weight ratio of the silver is 4:3:6, the weight ratio of 800 mesh silver: 500 mesh silver: 200 mesh silver in the silver is 2:2:3; or the weight ratio of 800 mesh copper: 500 mesh copper: 250 mesh copper in the copper is 15:15:20, the weight ratio of 800 mesh tin: 500 mesh tin: 250 mesh tin in the tin is 9:9:12, the weight ratio of 800 mesh cobalt: 500 mesh cobalt: 250 mesh cobalt in the cobalt is 5:5:6, the weight ratio of 800 mesh silver: 500 mesh silver in the silver is The weight ratio of 800 mesh copper: 400 mesh copper: 200 mesh copper is 1:1:2; or the weight ratio of 800 mesh copper: 400 mesh copper: 200 mesh copper is 18:18:24, the weight ratio of 800 mesh tin: 400 mesh tin: 200 mesh tin is 7.5:7.5:10, the weight ratio of 800 mesh cobalt: 400 mesh cobalt: 200 mesh cobalt is 3:2:5, and the weight ratio of 800 mesh silver: 400 mesh silver: 200 mesh silver is 1.5:1.5:

2.

2. The honing stick metal bond according to claim 1, characterized in that: The honing bar metal bond and abrasive are used together to prepare the honing bar, and the abrasive content is 6.25%-25% of the volume of the bond, corresponding to a concentration of 25-100%.

3. The honing stick metal bond according to claim 2, characterized in that: The abrasive is diamond or cubic boron nitride, and the particle size of the abrasive is in the range of 200 meshes to 800 meshes.

4. The honing stick metal bond according to claim 3, characterized in that: The honing rod metal bond is composed of the following raw materials in weight percentage: 60% copper, 25% tin, 10% cobalt, and 5% silver. The abrasive content is 18.75% of the bond volume, corresponding to a concentration of 75%, and the abrasive particle size is 400 meshes.

5. The honing stick metal bond according to any one of claims 2 to 4, characterized in that: The honing stick is prepared by the following method: a binder and an abrasive are mixed uniformly in proportion and then formed by a hot pressing sintering process, wherein the hot pressing sintering process comprises the following steps: (1) Temperature and pressure increase stage: within 1-6 minutes, the temperature is increased to 400°C and the pressure is increased to 75KN; (2) Temperature rising and pressure holding stage: within 6-12 minutes, the temperature rises to 850°C and the pressure is maintained at 75KN; (3) Heat preservation and pressure preservation stage: within 12-20 minutes, the temperature is maintained at 850°C and the pressure is maintained at 75KN; (4) Temperature reduction and pressure maintenance stage: Within 20-24 minutes, the temperature drops to 400°C and the pressure is maintained at 75KN.

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