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A processing method for yoke iron seat parts of dot matrix printer

A technology of a needle type printer and a processing method, which is applied in the fields of electrical components, inductance/transformer/magnet manufacturing, magnetic materials, etc. Conductivity, low coercivity, and the effect of improving strike force and sensitivity

Active Publication Date: 2017-03-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest disadvantage of soft magnetic materials prepared by powder metallurgy is that due to the existence of a certain number of pores in the sintered product, the density of the material is low, resulting in low magnetic properties of the material.
For example, the relative density of metal soft magnetic materials prepared by metal injection molding can only reach 90% to 95%. Due to a small amount of pores and other defects, it is difficult for the material to achieve high saturation magnetic induction, high magnetic permeability and low magnetic flux density. Coercivity

Method used

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  • A processing method for yoke iron seat parts of dot matrix printer
  • A processing method for yoke iron seat parts of dot matrix printer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] All kinds of raw materials are distributed according to the ingredients of 98% iron, 0.6% phosphorus, 0.4% silicon, 0.2% chromium, 0.2% carbon, and 0.6% manganese, and the powders of various raw materials are ball milled for 3 hours, and the mixed powder and ingredients are 60% paraffin , 15% high-density polyethylene, 20% polypropylene and 5% stearic acid binder, according to the volume ratio of the powder is 58% at a temperature of 160 ° C for 2 hours to prepare the binder and powder Mix evenly the feed material, and the feed material is formed on an injection molding machine, the forming parameters are: injection temperature 155°C, injection pressure 90MPa, injection speed 80%, pressure holding time 4s, to obtain the yoke seat forming blank. First, soak the molded billet in trichlorethylene for 4 hours for solvent degreasing, after the solvent degreasing billet is dried, then thermally degrease and pre-sinter the melted billet in a hydrogen atmosphere within a tempera...

Embodiment 2

[0019] All kinds of raw materials are distributed according to the ingredients of 97% iron, 1.0% phosphorus, 0.8% silicon, and 1.2% manganese chromium, and the powders of various raw materials are ball milled for 3 hours, and the mixed powder and ingredients are 60% paraffin, 15% high-density polyethylene , 20% polypropylene and 5% stearic acid binder, mixed for 2 hours at a temperature of 160°C for 58% by volume of the powder, to prepare a uniform feed of the binder and powder, fed The material is molded on an injection molding machine, and the molding parameters are: injection temperature 155°C, injection pressure 90MPa, injection speed 80%, pressure holding time 4s, and the yoke iron seat molding blank is obtained. First, soak the molded billet in trichlorethylene for 4 hours for solvent degreasing, after the solvent degreasing billet is dried, then thermally degrease and pre-sinter the melted billet in a hydrogen atmosphere within a temperature range of room temperature to ...

Embodiment 3

[0021] According to the ingredients of 97% iron, 0.8% phosphorus, 0.8% silicon, 0.6% chromium, 0.6% manganese, 0.2% C carbon, all kinds of raw materials are ball milled for 3 hours, and the mixed powder and ingredients are 60% The binding agent that paraffin wax, 15% high-density polyethylene, 20% polypropylene and 5% stearic acid are formed, is 58% by the volume ratio of powder at 160 ℃ of temperature and kneads 2 hours, prepares binding agent and The powder is uniformly mixed and fed, and the fed material is formed on an injection molding machine. The forming parameters are: injection temperature 155°C, injection pressure 90MPa, injection speed 80%, and holding time 4s to obtain a yoke seat forming blank. First, soak the molded billet in trichlorethylene for 4 hours for solvent degreasing, after the solvent degreasing billet is dried, then thermally degrease and pre-sinter the melted billet in a hydrogen atmosphere within a temperature range of room temperature to 800°C, and ...

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Abstract

The invention relates to a wire printer yoke iron seat and a processing production method thereof, and belongs to the technical field of production of wire printer iron cores. The method comprises the following steps: mixing carbonyl iron powder, powder obtained by uniformly mixing alloy powders and an appropriate binder at a certain temperature to prepare a uniformly mixed charge with good rheological performances, and carrying out an injection molding technology to prepare a body of a yoke iron seat with a required shape; and removing parts of the binder from injection molded body through a solvent degreasing technology, completely removing the binder from the body through a heating decomposition technology, and sintering the binder removed body at 1200-1500DEG C for 1-10h to obtain the yoke iron seat product. The density of a yoke seat soft-magnetic material prepared in the invention is greater than 98%, the magnetic induction intensity B6000 is 1.6-2.0T, the maximum magnetic conductivity is 8-25mH / m, the coercive force is smaller than 120A / m, the resistivity is greater than 20[mu]omega.cm, and the dimension precision of the product is smaller than + / -0.3%.

Description

technical field [0001] The invention belongs to the technical field of preparation of yoke iron bases for dot matrix printers, and in particular provides a preparation method for yoke iron base materials and yoke iron base parts for dot matrix printers. Background technique [0002] The yoke seat is a key part of the dot matrix printer, and it and the magnetic core are usually an integral part, collectively referred to as the yoke seat. There are several magnetic cores distributed on the yoke base, generally 12 or 24. Each magnetic core is equipped with a coil wound with enameled wire. The coil is connected to the circuit board. The upper part of the magnetic core is equipped with an armature, a printing needle and a return spring. When the control circuit signal is transmitted to the circuit board, it controls the on-off of the coil current. When the power is turned on, due to the phenomenon of electromagnetic induction, the magnetic core will be magnetized at this time, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C38/34C22C38/18C22C38/04C22C38/02C22C38/00B22F3/22H01F41/02H01F1/147
Inventor 秦明礼鲁慧峰章林贾宝瑞丁向莹曲选辉
Owner UNIV OF SCI & TECH BEIJING
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