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Preparation process of novel hard alloy to-be-extruded material

A cemented carbide and preparation technology, which is applied in metal processing equipment, transportation and packaging, etc., can solve the difficulties in controlling the amount of cemented carbide sintered carbon, the difficult volatilization of polymer compounds, and the limitations of applicability and practicability To avoid the softening and denaturation of paraffin wax, reduce the melting point of paraffin wax, and achieve the effect of strong practicability

Active Publication Date: 2020-09-11
ZHEJIANG DEWEI CEMENTED CARBIDE MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, about 40% of the bars in China are prepared by the extrusion molding process. The specific process of the cemented carbide extrusion molding process commonly used in China is mainly composed of wet grinding, slurry drying, glue mixing, and pre-pressing. , extrusion, blank drying, cutting and sintering. Although it can meet the needs of the market, the polymer compounds used in the extrusion process are generally difficult to volatilize and difficult to eliminate during the sintering process. It is difficult to control the amount of sintered carbon in cemented carbide. At the same time, other domestic cemented carbide extrusion molding processes will also be applied to some irritating and corrosive gases such as solvent gasoline and tetralin, which will affect the production environment. It will cause a certain impact, and it will also cause a certain threat to the health of the workers, so the applicability and practicality are limited.

Method used

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  • Preparation process of novel hard alloy to-be-extruded material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] figure 1 A specific embodiment of the invention is shown in which figure 1 It is a process schematic diagram of the present invention.

[0023] A preparation process for a novel cemented carbide material to be extruded, comprising a spray drying tower, a ball mill and a program-controlled fully automatic Z-type mixer, including the following steps,

[0024] Step A. Spray and granulate fully refined paraffin wax with a melting point of 50-56° C. through a spray drying tower to prepare powdered paraffin wax powder with certain fluidity; in this embodiment, the paraffin wax is 52# material.

[0025] Step B, different WC, Co, Cr 3 C 2 and alcohol into a ball mill to grind for 30-60 hours, after grinding, add the fully refined paraffin wax powder prepared in step A and continue grinding for 10 hours to prepare a mixed slurry, which is placed in a spray drying tower for spraying. Granules to prepare mixture granules;

[0026] Step C. Add the molding agent to a 300L autom...

Embodiment 2

[0040] In this embodiment, it is basically the same as in Example 1, except that in step C, the molding agent includes raw materials in the following percentages by weight: 1.25% of paraffin wax with a melting point of 40-45°C, 0.15% of microcrystalline wax , 1.7% n-dodecane and 0.4% oleic acid.

[0041] In step C, the heating and stirring temperature is 50-55° C., the stirring speed is 10-30 r / min, and the stirring time is 20-30 minutes.

[0042] In the step D, the addition of the n-hexane is 0.5% by weight.

[0043] In said step D, stirring the mixture comprises the following steps:

[0044] Step D-1, stirring for 100 minutes, the stirring temperature is 65°C, and the stirring speed is 30r / min, so that the state of the material is slurry;

[0045] Step D-2, continue to stir for 40 minutes, the stirring temperature is 30°C, and the stirring speed is 15r / min, so that the state of the material is dough;

[0046] Step D-3, continue to stir for 40 minutes, the stirring tempera...

Embodiment 3

[0049]In this embodiment, it is basically the same as in Example 1, except that in step C, the molding agent includes raw materials in the following percentages by weight: 1.0% of paraffin wax with a melting point of 40-45°C, 0.3% of microcrystalline wax , 1.5% n-dodecane and 0.3% oleic acid.

[0050] In step C, the heating and stirring temperature is 50-55° C., the stirring speed is 10-30 r / min, and the stirring time is 20-30 minutes.

[0051] In the step D, the addition of the n-hexane is 0.5% by weight.

[0052] In said step D, stirring the mixture comprises the following steps:

[0053] Step D-1, stirring for 150 minutes, the stirring temperature is 65°C, and the stirring speed is 30r / min, so that the state of the material is slurry;

[0054] Step D-2, continue stirring for 90 minutes, the stirring temperature is 30°C, and the stirring speed is 15r / min, so that the state of the material is dough;

[0055] Step D-3, continue to stir for 90 minutes, the stirring temperatu...

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Abstract

The invention discloses a preparation process of a novel hard alloy to-be-extruded material. The preparation process comprises the following steps of A, carrying out spray granulation on fully refinedparaffin, the smelting point of which is 50-56 DEG C through a spray drying tower to prepare powdery paraffin powder with certain flowability; B, inputting different WC, Co, Cr3C2 and alcohol in a ball mill to grind, and then adding the fully refined paraffin in the step A to prepare mixed slurry; C, adding a forming agent into a water bath and controlling a mixer to heat and stir till the mixture is melted; D, inputting the mixture in the step B into the step C to be hermetically stirred, and adding normal hexane; and E, inputting the mixture in the step D into a plunger extruder to obtain the extruded material. The preparation process is high in practicality, avoids defects of crack of a product due to centralized paraffin discharge of paraffin at the same smelting point in a sinteringprocess and the like and improves the processing quality. The preparation process avoids defects of crack of an extruded blank due to centralized drying and volatilization of the forming agent and thelike, and is high in practicality.

Description

technical field [0001] The invention belongs to the technical field of preparation of hard alloy extruded profiles, and in particular relates to a preparation process of a novel hard alloy material to be extruded. Background technique [0002] At present, domestic cemented carbide forming processes mainly include compression molding, cold isostatic pressing, dry bag pressing and extrusion. Compared with compression molding, isostatic pressing and dry bag pressing, extrusion molding of cemented carbide has the advantages of high raw material utilization rate, high production efficiency, high first pass rate, unlimited product length, and can be processed with internal cooling holes. Carbide rods and other advantages. At present, about 40% of the bars in China are prepared by the extrusion molding process. The specific process of the cemented carbide extrusion molding process commonly used in China is mainly composed of wet grinding, slurry drying, glue mixing, and pre-pressi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/20
CPCB22F3/20B22F1/108B22F1/102
Inventor 陈敏李振东汪维
Owner ZHEJIANG DEWEI CEMENTED CARBIDE MFG CO LTD