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Method for making diamond string beads

A diamond bead and diamond technology, which is applied in the field of diamond bead preparation, can solve problems such as high requirements, loss of liquid phase materials, and easy-to-damage equipment, and achieve the effects of meeting wear resistance requirements, reducing comprehensive energy consumption, and reducing labor intensity

Active Publication Date: 2015-03-25
GUILIN TEBON SUPERHARD MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of diamond beads by hot pressing sintering is adopted by most diamond tool enterprises because of its regular shape, good matrix compactness, and high wear resistance of beads, but it has the following disadvantages at the same time: (1) the graphite used for sintering The requirements for the mold material are high, and the service life of the graphite mold is short and the loss is large; (2) the number of beads for one sintering in the hot-press sintering furnace is limited, and the production efficiency is low; (3) each sintering requires rapid heating and Cooling, high energy consumption, and easy damage to equipment; (4) Due to the external pressure applied to the beaded carcass during sintering, the liquid phase material in the sintered body is easily lost, resulting in burrs at the corners of the carcass and the composition of the carcass. Segregation affects the performance of the carcass; (5) The loading and unloading of the mold needs to be done manually, which is not only low in efficiency and high in cost, but also the performance of the product is easily affected by the proficiency of the production workers

Method used

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  • Method for making diamond string beads

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Weigh Fe-based submicron alloy powder (average particle size of 2 μm), CuSn alloy powder (average particle size of 30 μm) and W powder (average particle size of 5.5 μm) composed of Fe45Co17Cu38 in a weight ratio of 17:1:2 ) a total of 1kg, mixed evenly to obtain a mixed powder; take 5.0g of WS-120 granulation agent, dissolve it in 20g of absolute ethanol to make a solution, slowly drop it into the above mixed powder, and place it in a stirring granulator Mixing in the medium, so that the metal powder is aggregated to achieve the purpose of granulation, and the granular material is obtained; wherein, the Fe-based submicron alloy powder composed of Fe45Co17Cu38 is prepared according to the following method:

[0035] According to the molar ratio of the substance, n(Fe 2+ ):n(Co 2+ ):n(Cu 2+ )=45:17:38 ratio configuration concentration is 1.5mol / L FeCl 2 、CoCl 2 , CuCl 2 Mix 50L of solution and 50L of oxalic acid solution with a concentration of 1.8mol / L (the temper...

Embodiment 2

[0042] Repeat Example 1, the difference is:

[0043] ① The composition of Fe-based submicron alloy powder is Fe43Co17Cu40, and its average particle size is 3 μm; the auxiliary materials are WC powder, Zn powder and Al powder, and their average particle size is 8 μm. The Fe-based submicron alloy powder, WC powder, Zn powder The weight ratio to Al powder is 87:8:3:2.

[0044] 2. Take copper-plated coated diamond (wherein particle size 40 / 45 accounts for 50%, particle size 45 / 50 accounts for 40%, and particle size 50 / 60 accounts for 10%) by weighing the concentration of 1.6 carats per cubic centimeter and add it in the granular material; The relative density of the carcass ring obtained after cold pressing and free sintering of the carcass material is ≥ 97%, and the Rockwell hardness ≥ 90HRB. The rectangular parallelepiped carcass standard sample (30×12× 6) Three-point bending strength ≥ 1000MPa;

[0045] ③Free sintering temperature and time: sintering at 650°C for 40 minutes, ...

Embodiment 3

[0047] Repeat Example 1, the difference is:

[0048] ①The composition of Fe-based submicron alloy powder is Fe44Co19Cu37, (average particle size is 3μm;

[0049] 2. Weigh copper-plated coated diamond (wherein particle size 40 / 45 accounts for 35%, particle size 45 / 50 accounts for 45%, and particle size 50 / 60 accounts for 20%) by weighing the concentration of 1.5 carats per cubic centimeter, and add it to the granular material to obtain The relative density of the carcass ring obtained after cold pressing and free sintering of the carcass material is ≥98%, and the Rockwell hardness is ≥90HRB. The rectangular parallelepiped carcass standard sample (30×12×6 ) three-point bending strength ≥ 1150MPa;

[0050] ③Free sintering temperature and time: sintering at 550°C temperature zone for 50 minutes, sintering at 650°C temperature zone for 40 minutes, sintering at 750°C temperature zone for 30 minutes, sintering at 850°C temperature zone for 50 minutes, and sintering at 750°C for 110 ...

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Abstract

The invention discloses a method for making diamond string beads. The method comprises the steps that firstly Fe-based submicron alloy powder, auxiliary material and granular-making additive are used for making granules, the granules are evenly mixed with diamond grains, and carcass materials are obtained, wherein the Fe-based submicron alloy powder is composed of Fe (45+x)Co(17+y) Cu (38+z), -2 <= x, y and z<=2, and x+ y+ z=0; secondly the carcass materials are made unto carcass rings, bead core steel is sleeved with the carcass rings, then the bead core steel sleeved with the carcass rings are freely sintered in a uniform atmosphere, and the diamond string beads are obtained. The Fe-based submicron alloy powder composed of specific ingredients is used for making the diamond string beads through free sintering, the carcass linear shrinkage is made to be 13%-18%, the carcass can not crack and deform after being shrunk, and composition segregation can not happen in the carcass after sintering is completed; by means of the powder, the sharpness of the obtained string beads can be improved, and the abrasion resistance requirement of a string bead rope saw is met; in addition, labor intensity, energy consumption and unit cost are all lowered to a certain extent.

Description

technical field [0001] The invention relates to a diamond wire saw, in particular to a method for preparing diamond beads. Background technique [0002] Diamond beads are composed of two parts, the working layer carcass ring and the hollow cylindrical bead core steel body. The manufacturing process mainly includes hot pressing sintering method, electroplating method and brazing method. At present, the preparation of diamond beads by hot pressing sintering is adopted by most diamond tool enterprises because of its regular shape, good matrix compactness, and high wear resistance of beads, but it has the following disadvantages at the same time: (1) the graphite used for sintering The requirements for the mold material are high, and the service life of the graphite mold is short and the loss is large; (2) the number of beads for one sintering in the hot-press sintering furnace is limited, and the production efficiency is low; (3) each sintering requires rapid heating and Cooli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/08
Inventor 卢安军秦海青林峰蒙光海雷晓旭刘文平程煜张健伟张振军莫睿
Owner GUILIN TEBON SUPERHARD MATERIAL
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