CN105234417A - Manufacturing method for thin-wall medical parts - Google Patents

Abstract

The invention belongs to the technical field of medical instruments, and particularly relates to a manufacturing method for thin-wall medical parts through a powder injection forming technology. Compared with the prior art, the thin-wall parts produced by the adoption of the powder injection forming technology have the characteristics that products in complex shapes are formed at a time, the product dimensional precision is high, no mechanical processing or only minimal processing is required, production automation is likely to be realized, and the product performance is excellent. The processing efficiency is high, the processing cost is also greatly reduced, and customer needs can be well met.

Description

A kind of preparation method of medical thin-walled parts

Technical field

The invention belongs to medicine equipment preparation field, relate to a kind of preparation method of thin-walled parts, especially relate to a kind of medical thin-walled parts.

Background technology

Thin-walled parts, because having lightweight, feature such as saving material, compact conformation etc., has been widely used in each industrial machine and parts.It is adopt the method manufacture of machining that traditional method prepares such or of this sort medical thin-walled parts, but due to operation various, working (machining) efficiency is low, and yield rate is low, and the cost of processing is high, is thus badly in need of seeking a kind of new processing method and substitutes.

Summary of the invention

The present invention, in order to solve the deficiencies in the prior art, adopts powder injection-molded technology, and this technology is a novel newly net forming technology, solves the shortcoming of above-mentioned machining.

The present invention for solving the problems of the technologies described above adopted technical scheme is: the preparation method of a kind of preparation method of medical thin-walled parts, is characterized in that comprising the following steps:

1) prepare binding agent: described binding agent is made up of silica gel, Merlon, methyl acrylate, wherein the percentage by weight of each component is: silica gel 70 ~ 75%, Merlon 8 ~ 10%, methyl acrylate 15 ~ 20%; First by 8 ~ 10% Merlon, 15 ~ 20% methyl acrylates add kneader, are warming up to 200 ~ 220 DEG C, mixing 10 ~ 15 minutes; Reduce melting temperature to 180 ~ 190 DEG C, then 70 ~ 75% silica gel are added kneader, mixing 10 ~ 15 minutes, obtained binding agent;

2) feeding is prepared: first the binding agent of percentage by weight 10 ~ 15% and the metal dust of 85 ~ 90% are added three-dimensional rotation device, obtain the mixture of uniform powder and binding agent; Then the mixture of above-mentioned uniform powder and binding agent is added kneader, be warming up to 200 ~ 220 DEG C, mixing 10 ~ 15 minutes; Reduce melting temperature to 180 ~ 190 DEG C, mixing 10 ~ 15 minutes, obtained feeding;

3) injection moulding: the aforementioned feeding prepared is added injector and injects, according to the feature of product, product injection parameters is adjusted, its suitable parameter area is as follows: injection temperature 170 ± 10 DEG C, injection pressure: 60 ~ 80bar, injection speed: 60 ~ 80 mm/second, inject time: 1 ~ 1.5 second, cool time: 5 ~ 7 seconds, dynamic model temperature: 20 ~ 25 DEG C, cover half temperature: 10 ~ 12 DEG C;

4) degreasing: first degreasing adopts solvent degreasing, then carries out two step degreasing methods of thermal debinding;

Solvent degreasing: first the ethanol of 95% is added solvent degreasing groove and carry out being heated to 50 ~ 60 DEG C, then carries out degreasing in 2 ~ 3 hours in a solvent by the blank injected bubble, after blank taken out be placed in drying box dry 30 minutes;

Thermal debinding: the blank that solvent degreasing is good is placed in vacuum degreasing stove and carries out thermal debinding, thermal debinding adopts temperature-gradient method program, ensure that the remaining binders after solvent degreasing can remove smoothly thoroughly, adopt respectively and insulation platform is set the fast decoupled temperature 350 DEG C of methyl acrylate and Merlon and 550 DEG C, then more than 850 DEG C, carry out presintering;

5) sinter: adopt vacuum sintering furnace to sinter, control sintering temperature at 1310 ~ 1370 DEG C, control sintering vacuum at 150 ~ 200Pa, control sintering time at 80-100 minute.

Advantage of the present invention is: have once-forming complicated shape goods, product size precision high, without the need to machining or only need trace processing, be easy to realize the feature of the production automation and excellent product performance, working (machining) efficiency is high, processing cost also reduces greatly, is well positioned to meet the demand of client.

Detailed description of the invention

Embodiment:

Plant the preparation method of the preparation method of medical thin-walled parts, it is characterized in that comprising the following steps:

1) prepare binding agent: described binding agent is made up of silica gel, Merlon, methyl acrylate, wherein the percentage by weight of each component is: silica gel 70 ~ 75%, Merlon 8 ~ 10%, methyl acrylate 15 ~ 20%; First by 8 ~ 10% Merlon, 15 ~ 20% methyl acrylates add kneader, are warming up to 200 ~ 220 DEG C, mixing 10 ~ 15 minutes; Reduce melting temperature to 180 ~ 190 DEG C, then 70 ~ 75% silica gel are added kneader, mixing 10 ~ 15 minutes, obtained binding agent;

2) feeding is prepared: first the binding agent of percentage by weight 10 ~ 15% and the metal dust of 85 ~ 90% are added three-dimensional rotation device, obtain the mixture of uniform powder and binding agent; Then the mixture of above-mentioned uniform powder and binding agent is added kneader, be warming up to 200 ~ 220 DEG C, mixing 10 ~ 15 minutes; Reduce melting temperature to 180 ~ 190 DEG C, mixing 10 ~ 15 minutes, obtained feeding;

3) injection moulding: the aforementioned feeding prepared is added injector and injects, according to the feature of product, product injection parameters is adjusted, its suitable parameter area is as follows: injection temperature 170 ± 10 DEG C, injection pressure: 60 ~ 80bar, injection speed: 60 ~ 80 mm/second, inject time: 1 ~ 1.5 second, cool time: 5 ~ 7 seconds, dynamic model temperature: 20 ~ 25 DEG C, cover half temperature: 10 ~ 12 DEG C;

4) degreasing: first degreasing adopts solvent degreasing, then carries out two step degreasing methods of thermal debinding;

Solvent degreasing: first the ethanol of 95% is added solvent degreasing groove and carry out being heated to 50 ~ 60 DEG C, then carries out degreasing in 2 ~ 3 hours in a solvent by the blank injected bubble, after blank taken out be placed in drying box dry 30 minutes;

Thermal debinding: the blank that solvent degreasing is good is placed in vacuum degreasing stove and carries out thermal debinding, thermal debinding adopts temperature-gradient method program, ensure that the remaining binders after solvent degreasing can remove smoothly thoroughly, adopt respectively and insulation platform is set the fast decoupled temperature 350 DEG C of methyl acrylate and Merlon and 550 DEG C, then more than 850 DEG C, carry out presintering;

5) sinter: adopt vacuum sintering furnace to sinter, control sintering temperature at 1310 ~ 1370 DEG C, control sintering vacuum at 150 ~ 200Pa, control sintering time at 80-100 minute.

Claims (1)

1. the preparation method's of a medical thin-walled parts preparation method, is characterized in that comprising the following steps:

1) prepare binding agent: described binding agent is made up of silica gel, Merlon, methyl acrylate, wherein the percentage by weight of each component is: silica gel 70 ~ 75%, Merlon 8 ~ 10%, methyl acrylate 15 ~ 20%; First by 8 ~ 10% Merlon, 15 ~ 20% methyl acrylates add kneader, are warming up to 200 ~ 220 DEG C, mixing 10 ~ 15 minutes; Reduce melting temperature to 180 ~ 190 DEG C, then 70 ~ 75% silica gel are added kneader, mixing 10 ~ 15 minutes, obtained binding agent;

2) feeding is prepared: first the binding agent of percentage by weight 10 ~ 15% and the metal dust of 85 ~ 90% are added three-dimensional rotation device, obtain the mixture of uniform powder and binding agent; Then the mixture of above-mentioned uniform powder and binding agent is added kneader, be warming up to 200 ~ 220 DEG C, mixing 10 ~ 15 minutes; Reduce melting temperature to 180 ~ 190 DEG C, mixing 10 ~ 15 minutes, obtained feeding;

3) injection moulding: the aforementioned feeding prepared is added injector and injects, according to the feature of product, product injection parameters is adjusted, its suitable parameter area is as follows: injection temperature 170 ± 10 DEG C, injection pressure: 60 ~ 80bar, injection speed: 60 ~ 80 mm/second, inject time: 1 ~ 1.5 second, cool time: 5 ~ 7 seconds, dynamic model temperature: 20 ~ 25 DEG C, cover half temperature: 10 ~ 12 DEG C;

4) degreasing: first degreasing adopts solvent degreasing, then carries out two step degreasing methods of thermal debinding;

Solvent degreasing: first the ethanol of 95% is added solvent degreasing groove and carry out being heated to 50 ~ 60 DEG C, then carries out degreasing in 2 ~ 3 hours in a solvent by the blank injected bubble, after blank taken out be placed in drying box dry 30 minutes;

Thermal debinding: the blank that solvent degreasing is good is placed in vacuum degreasing stove and carries out thermal debinding, thermal debinding adopts temperature-gradient method program, ensure that the remaining binders after solvent degreasing can remove smoothly thoroughly, adopt respectively and insulation platform is set the fast decoupled temperature 350 DEG C of methyl acrylate and Merlon and 550 DEG C, then more than 850 DEG C, carry out presintering;

5) sinter: adopt vacuum sintering furnace to sinter, control sintering temperature at 1310 ~ 1370 DEG C, control sintering vacuum at 150 ~ 200Pa, control sintering time at 80-100 minute.