CN103057023A - Improvement method for centrifugal casting silicon tube - Google Patents

Abstract

The invention relates to an improvement method for a centrifugal casting silicon tube. The improvement method for the centrifugal casting silicon tube comprises the steps of (1) constructing a centrifugal casting device comprising a motor, a coupler, a stainless steel precise tube for casting and molding and a bearing; (2) preparing a mold release, immersing granulous gelatin with certain quantity in purified water for 5 hours, putting a container for containing the gelatin into a water bath after the gelatin fully absorbs moisture and expands, and heating until the gelatin is dissolved completely; (3) pouring the mold release; (4) preparing an RTV (room temperature vulcanization) silicon solution; (5) pouring and curing the silicon solution, namely, pouring a certain amount of silicon mixed solution after volume defoaming into the stainless steel precise tube, and under room temperature, driving the stainless steel tube by the high-speed rotation of the motor until the mixed solution is cured; and (6) demolding, and taking out the molded silicon tube after the cured gelatin is dissolved at the temperature of 35 DEG C. According to the invention, the problem of demolding of silicon tube machining is solved well, and the required silicon tube is manufactured effectively.

Description

A kind of improving one's methods for the centrifugal casting silicone tube

Technical field

The present invention relates to a kind ofly for the improving one's methods of centrifugal casting silicone tube, belong to the silicone tube preparing technical field.

Background technology

Because the impact of activity after bio-tissue exsomatizes adopts the good silicone tube simulated blood vessel of elastic performance or tracheae to study its inner flow field problem usually in the laboratory.

Traditional sebific duct processing mold pressing or extrusion forming process of adopting more, introduce such as document 1---Luo Shoujing, ChenBing Guang, Qi Pixiang. liquid forging and extrusion forging technology. Beijing: Chemical Industry Press, 2006.Mould pressing process needs expensive mould, and the construction cycle is long, and very easily produces waste product.The extrusion forming process precision is relatively poor, and there is obvious defective in product.Therefore, these two kinds of methods all are not suitable for making the silicone tube of different wall.

Summary of the invention

The technology of the present invention is dealt with problems: overcome the deficiencies in the prior art, provide a kind of for the improving one's methods of centrifugal casting silicone tube, solved well the release problems of silicone tube processing, effectively produced the silicone tube that meets specification requirement.

The technology of the present invention solution: a kind of for the improving one's methods of centrifugal casting silicone tube, its characteristics are that performing step is as follows:

(1) centrifugal casting equipment builds

Precision stainless steel pipe 3 and bearing 4 that centrifugal casting equipment comprises motor 1, shaft coupling 2, uses as casting mold, wherein motor drives precision stainless steel pipe High Rotation Speed by shaft coupling, and the acting as of bearing reduced in the precision stainless steel pipe High Rotation Speed process frictional resistance with axle bed;

(2) preparation of releasing agent

A certain amount of granular gelatin was soaked 5 hours in pure water, and the mass ratio of described gelatin and water is 1:7, fully absorbs the container that will hold gelatin after moisture expands until gelatin and is placed in the water-bath, is heated to gelatin and dissolves fully under 80 ℃ of conditions;

(3) perfusion of releasing agent

Outside diameter d according to silicone tube to be processed ₁, the precision stainless steel pipe inner diameter d ₂And length L, with a certain amount of volume V ₁Gelatin solution be fed in the precision stainless steel pipe, under room temperature 20-25 ℃ condition, motor High Rotation Speed certain hour is namely finished the interpolation operation of releasing agent until gelatin solution solidifies; Described motor High Rotation Speed certain hour is decided according to the gelatin solution amount that is fed into, get 5 to 15 minutes (owing to evenly be attached to the precision stainless steel pipe internal surface, the gelatin of being used as releasing agent is thinner one deck, therefore setting time is generally 5 to 15 minutes under the room temperature condition);

$V_1=L\&times;\mathrm{\&pi;}\&times;[{\left(\frac{{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="HDA00002758160400011.png"\; state="\{\{state\}\}">d</figure-callout>}}_2}{2}\right)}^2-{\left(\frac{d_1}{2}\right)}^2]---\left(1\right)$

(4) preparation of room temperature vulcanized (RTV) silica gel solution

Adopt the two components of RTV type, i.e. A component and B component silicone rubber machine silicon sebific duct, concrete operation comprises:

A. metering: according to the requirement of selected two-component silicone rubber, according to proportioning ratio accurate weighing A component and the B component of mass ratio A:B;

B. stir and deaeration: the mixed solution of A, B component is mixed in transparent vessel, and place transparent airtight container to vacuumize certain hour with deaeration; Described certain hour is decided according to the mixed solution amount, and the deaeration time decide by A, the B mixed solution observed in the transparent vessel, if there is not obvious bubble rising in the mixed solution, illustrates that then deaeration finishes, and this time was above 5 minutes usually;

(5) perfusion of silica gel solution and curing: according to the requirement of silicone tube wall thickness h to be processed, with a certain amount of volume V ₂Silica gel mixed solution after the deaeration is fed in the precision stainless steel pipe, and under room temperature 20-25 ℃ condition, motor High Rotation Speed certain hour drives the precision stainless steel pipe until mixed solution solidifies; Described high speed is often referred to rotating speed above 1000 rev/mins;

${\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HDA00002758160400011.png"\; state="\{\{state\}\}">V</figure-callout>}}_2=L\&times;\mathrm{\&pi;}\&times;[{\left(\frac{d_1}{2}\right)}^2-{(\frac{d_1}{2}-h)}^2]---\left(2\right)$

(6) demoulding is under 35 ℃ in temperature namely, takes out the silicone tube of moulding after the gelatin dissolving of solidifying.

The present invention's advantage compared with prior art is:

(1) under the cryogenic conditions, centrifugal casting adopts paraffin as releasing agent usually.It is uneven that paraffin solidifies the rear surface, thus need polishing, however for silicone tube processing, polishing process has great difficulty, surface roughness and the axiality of paraffin after being difficult to guarantee to polish.The present invention is directed to this technological difficulties, solve the release problems of silicone tube processing, by traditional centrifugal casting technique is improved, effectively produced the silicone tube that meets specification requirement.

(2) characteristics simple in structure according to silicone tube, the present invention selects centrifugal casting to process, and it is low that this method has a cost, and the liquid advantage that crystalline structure is fine and close under centrifugal action, defective is few is fit to make the uniform silicone tube of wall thickness very much.

(3) it is smooth that gelatin solution solidifies the rear surface, meets the requirement of surface roughness fully.Therefore, with respect to traditional centrifugal casting technique, adopt gelatin not need to carry out polishing as releasing agent.The present invention adopts gelatin to substitute paraffin as releasing agent, has solved well the release problems of silicone tube processing.

Description of drawings

Fig. 1 is centrifugal casting equipment figure;

Fig. 2 is the realization flow figure of the inventive method;

The silicone tube of Fig. 3 for adopting the inventive method to produce, internal diameter is 10 millimeters, wall thickness is 0.7 millimeter.

The specific embodiment

As shown in Figure 2, the main processing step of silicone tube centrifugal casting of the present invention is:

(1) centrifugal casting equipment builds.Centrifugal casting equipment comprises that mainly motor 1, shaft coupling 2, precision stainless steel pipe 3(use as casting mold) and bearing 4, as shown in Figure 1, wherein motor 1 drives precision stainless steel pipes 3 High Rotation Speeds by shaft coupling 2.Bearing 4 and precision stainless steel pipe 3 external diameter interference fit, it act as the frictional resistance that reduces in the precision stainless steel pipe 3 High Rotation Speed processes with axle bed;

(2) preparation of releasing agent.With a certain amount of (as long as compare V ₁How just) granular gelatin soaks 5 hours (mass ratio of gelatin and water is 1:7) in pure water, fully absorb the container that will hold gelatin after moisture expands until gelatin and be placed in the water-bath, is heated to gelatin and dissolves fully under 80 ℃ of conditions;

(3) perfusion of releasing agent.According to the external diameter of silicone tube to be processed, internal diameter and the length of precision stainless steel pipe, with a certain amount of volume V ₁Gelatin solution be fed in the precision stainless steel pipe.At ambient temperature, motor High Rotation Speed certain hour (deciding according to the gelatin solution amount that is fed into) is namely finished the interpolation operation of releasing agent until gelatin solution solidifies.

(4) preparation of RTV type silica gel solution.Usually adopt two component (A component and B component) silica gel machine silicon sebific ducts, master operation comprises:

A. metering: according to the requirement of selected two-component silicone rubber, according to proportioning ratio accurate weighing A component and the B component of mass ratio A:B;

B. stir: the mixed solution of A, B component is mixed in transparent vessel, and (the deaeration time can decide by A, the B mixed solution of observing transparent vessel to place the transparent sealing container to vacuumize certain hour, if there is not obvious bubble to rise in the mixed solution, illustrate that then deaeration finishes.General this time was above 5 minutes) (deciding according to the mixed solution amount) with deaeration;

(5) perfusion of silica gel solution and curing.According to the requirement of silicone tube wall thickness to be processed, with a certain amount of volume V ₂Silica gel mixed solution after the deaeration is fed in the precision stainless steel pipe.Be under the 20-25 ℃ of condition in room temperature, (the two-component silicone rubber product of purchase can provide this product under the A:B proportioning ratio condition that requires to motor High Rotation Speed certain hour, the hardening time of A, B mixed solution during different temperatures.Different two-component silicone rubber products, hardening time, difference was very large, bad provided concrete scope here) (deciding according to selected two-component silicone rubber) drive precision stainless steel pipe until mixed solution solidifies;

(6) demoulding is under 35 ℃ in temperature namely, takes out the silicone tube of moulding after the gelatin dissolving of solidifying.

In inventive embodiments, the motor speed of selection is 1800 rev/mins, and the internal diameter of precision stainless steel pipe is 300 millimeters of 13.5 millimeters, pipe range, and two-component silicone rubber is GE RTV615(A+B).12.8 milliliters gelatin solutions are fed in the precision stainless steel pipe, and the motor High Rotation Speed drives accurate pipe rotation 10 minutes to gelatin solution and solidifies.GE RTV615 silicon rubber A component and B component are that (amounting to 330 grams) weighed, mixed in the requirement of 10:1 according to mass ratio, and vacuum defoamation is extracted 7.0 milliliters silicon rubber mixed solution and is fed in the accurate pipe after 5 minutes.Be under 25 ℃ of conditions in temperature, motor high speed (being 1800 rev/mins in the embodiment of the invention) rotarily drives the precision pipe and rotates 36 hours to the curing of silica gel mixed solution, then with the silicone tube (as shown in Figure 3) of 35 ℃ of left and right sides emerge in worm water precision pipes with the taking-up moulding.

The silicone tube that centre spinning after adopt improving produces can effectively avoid the defective that produces in the process, and method is simple, cost is low.In the laboratory, this kind silicone tube has been applied among the research of simulated blood vessel or tracheae, and has obtained good effect.In addition, this class silicone tube also can be widely used in the fields such as food, medical treatment and instrument and meter.

Need to prove, according to the various embodiments described above of the present invention, those skilled in the art are the four corners that can realize independent claims of the present invention and appurtenance fully, implementation procedure and method same the various embodiments described above; And the non-elaborated part of the present invention belongs to techniques well known.

The above; only be the part specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any those skilled in the art are in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.

Claims (1)

1. one kind is used for improving one's methods of centrifugal casting silicone tube, it is characterized in that performing step is as follows:

The first step, the building of centrifugal casting equipment

Centrifugal casting equipment comprises motor (1), shaft coupling (2), as precision stainless steel pipe (3) and bearing (4) that casting mold is used, wherein motor (1) drives precision stainless steel pipe (3) High Rotation Speed by shaft coupling (2); The acting as of bearing (4) reduced in precision stainless steel pipe (3) the High Rotation Speed process frictional resistance with axle bed;

Second step, the preparation of releasing agent

A certain amount of granular gelatin was soaked 5 hours in pure water, and the mass ratio of described gelatin and water is 1:7, fully absorbs the container that will hold gelatin after moisture expands until gelatin and is placed in the water-bath, is heated to gelatin and dissolves fully under 80 ℃ of conditions;

The 3rd step, the perfusion of releasing agent

Outside diameter d according to silicone tube to be processed ₁, precision stainless steel pipe (3) inner diameter d ₂And length L, with a certain amount of volume V ₁Gelatin solution be fed in the precision stainless steel pipe (3), under room temperature 20-25 ℃ condition, motor (1) High Rotation Speed certain hour is namely finished the interpolation operation of releasing agent until gelatin solution solidifies; Described motor (1) the High Rotation Speed time is 5 to 15 minutes;

$V_1=L\&times;\mathrm{\&pi;}\&times;[{\left(\frac{d_2}{2}\right)}^2-{\left(\frac{d_1}{2}\right)}^2]---\left(1\right)$

The 4th step, the preparation of room temperature vulcanized (RTV) silica gel solution

Adopt the two components of RTV type, i.e. A component and B component silicone rubber machine silicon sebific duct, concrete operation comprises:

A. metering: according to the requirement of selected two-component silicone rubber, according to proportioning ratio accurate weighing A component and the B component of mass ratio A:B;

B. stir and deaeration: the mixed solution of A, B component is mixed in transparent vessel, and place transparent airtight container to vacuumize certain hour with deaeration;

The 5th step, the perfusion of silica gel solution and curing: according to the requirement of silicone tube wall thickness h to be processed, with a certain amount of volume V ₂Silica gel mixed solution after the deaeration is fed in the precision stainless steel pipe (3), and under room temperature 20-25 ℃ condition, motor (1) High Rotation Speed certain hour drives precision stainless steel pipe (3) until mixed solution solidifies;

$V_2=L\&times;\mathrm{\&pi;}\&times;[{\left(\frac{d_1}{2}\right)}^2-{(\frac{d_1}{2}-h)}^2]---\left(2\right)$

In the 6th step, the demoulding is under 35 ℃ in temperature namely, takes out the silicone tube of moulding after the gelatin dissolving of solidifying.

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