RU2505400C2 - Two-channel extrusion head for making polymer shaped runner using ultrasound oscillations - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: proposed two-channel extrusion head is used for making a polymer furniture runner with application of ultrasound oscillations. Proposed head comprises split case composed of two sections with cooling system that make forming channels of shaped cross-sections communicated with the head feed channel and magnetostriction radiators. Note here that said magnetostriction radiators are arranged at forming head, at upper section above shaped grooves. Surface of said grooves is shaped to "Ш"-like section. Cooling system is composed of three rectangular cross-section flow channels located at upper section.

EFFECT: higher efficiency and quality, simplified design.

2 dwg

Description

The invention relates to the field of equipment for the processing of polymeric materials and can be used in the petrochemical industry, in particular for the manufacture of furniture skid.

Known two-channel extrusion head for the manufacture of polymer cladding rails containing a housing made detachable with a cooling system. The liners form two forming channels of a profile section between themselves. The inner surface of the profile insert is formed by a sinusoidal curve. At the concavity of the indicated surface, rods are longitudinally located (RF patent No. 2189314, MKI B29C 47/12, 2002. Bull. No. 26).

The disadvantage of this extrusion head is the complexity of construction and installation, since the head consists of two sections and two inserts that require the necessary accuracy during installation, i.e., alignment with respect to longitudinally located rods, which can lead to distortion of the cross section of the profile shape and deterioration in the quality of extruded products.

The closest in technical essence and the achieved effect is a multi-extruded extrusion head for the manufacture of polymer profile products using ultrasonic vibrations, which contains a housing, a holder with a mandrel and channels of profile section for passing the polymer melt communicated with the feed channel of the head and a magnetostrictive emitter (RF patent No. 2147989, MKI B29C 47/12, 2002. Bull. No. 12, prototype).

A disadvantage of the known extrusion head is the complexity of construction and installation, since the head consists of two half-cylindrical sections and a split mandrel, consisting of two cross-shaped sections that are mounted in a cylindrical ferrule. The connection of the half-cylindrical sections and the split mandrel requires the necessary accuracy during installation, that is, compliance with the alignment with respect to the longitudinally located half-cylindrical sections and the mandrel, which can lead to distortion of the cross section of the profile shape and deterioration in the quality of extruded products.

In this design, the uniform penetration of ultrasonic vibrations directly onto the entire mass of the polymer melt is not achieved, since the magnetostrictive emitter is located in a limited area only in the center of the split mandrel, therefore, a decrease in the viscosity of the melt in the wall layer of the extrudate has little and little effect on improving the productivity and surface quality of products .

The invention is aimed at solving the problem of simplifying the design of the extrusion head and increasing the productivity and quality of the polymer furniture skid.

This problem is solved due to the fact that the two-channel extrusion head for the manufacture of a polymer furniture skid using ultrasonic vibrations, comprising a housing made detachable from two sections with a cooling system, forming forming channels of profile section communicating with the power channel of the head and magnetostrictive emitters. In this case, magnetostrictive transducers are installed on the forming head in the upper section above the profile grooves, the surface of which is formed in the form of a W-shaped profile, and the cooling system is made in the form of three flow channels of rectangular cross section symmetrically located in the upper section.

The novelty of the invention lies in the fact that magnetostrictive transducers are installed on the forming head in the upper section above the profile grooves, the surface of which is formed in the form of a U-shaped profile, and the cooling system is made in the form of three flow channels of rectangular cross section symmetrically located in the upper section.

The technical result provided by the two-channel extrusion head for the manufacture of a polymer furniture skid is expressed in simplifying the design and improving the quality of the furniture skid, due to the choice of the optimal cross-sectional geometry of the forming channels.

The invention is illustrated by drawings: in Fig.1 is a cross-section of a two-channel extrusion head for the manufacture of a polymer furniture skid using ultrasonic vibrations; figure 2 is a cross section of the resulting furniture skid.

The two-channel extrusion head for the manufacture of a polymer furniture skid, in accordance with figure 1, contains a detachable housing consisting of two sections of the upper 1 and lower 2, in which there are forming channels 3 formed in the upper section, the cross-section surface of which has a W-shaped profile . The forming channels 3 are equipped with a cooling system, consisting of three symmetrically arranged 4 for the flow of water in the upper section 1, through which the supply and removal of refrigerant.

The upper section 1 and the lower section 2 of the housing are interconnected by bolts 5.

Over the forming channels 3, magnetostrictive transducers 6 of the ПМС-6-22 type are mounted on the upper surface of the head, with the possibility of connecting them to the ultrasonic oscillation source 7 of UZG1-4.

The extrusion head is connected to the extruder using a flange (not shown).

A two-channel extrusion head for the manufacture of a polymer furniture skid using ultrasonic vibrations works as follows.

The polymer melt injected by the screw of the extruder enters the feed channel, then into the forming channels 3 formed in the upper section 1. The forming channels 3 give the polymer melt the U-shaped shape of the furniture skid in accordance with FIG. 2. The upper 1 and lower 2 sections are made of steel 45 with a high class Ra 0.8 of the contact surface cleanliness, which allows, when combining these parts, during assembly to assemble solid, without the slightest gaps, forming channels 3, when forcing through which polymer melt jets on the furniture surface the runner does not form traces of the joints of the parts. The furniture skid leaves the forming channels with a glossy surface with a high class of cleanliness.

In the upper section 1 of the housing of the extrusion head provides for the cooling of the extrudable furniture skid by supplying and discharging refrigerant using channels for the flow of water 4.

When the polymer melt is pressed through the forming channels, the extrudate is affected by the superposition of ultrasonic vibrations using magnetostrictive emitters 6 mounted on the upper plane of the head housing. The source of ultrasonic waves is an ultrasonic generator 7 of the UZG1-4 type, with the help of which an overlay is created on the polymer melt in the molding zone with a fixed oscillation frequency of 18, 19, 20, 22 and 24 kHz.

Due to the use of magnetostrictive emitters, the melt viscosity decreases, which reduces the resistance of the wall effect of melt outflow at the boundary with the surface of the forming channel.

Experimental studies were carried out on the ATL-45 experimental installation, which has a worm with a diameter of 45 mm and a length of 1125 mm.

The extrusion head had the following geometric dimensions: body width 270 mm, length 300 mm, length of the forming channels was 230 mm. A furniture skid with a size of 11 × 26 mm was obtained with grooves with a shoulder height of 6 mm and a groove width of 6 mm, the thickness of the bottom and shoulders was 5 mm. Received a furniture runner made of polystyrene PS-S GOST20282.

The optimum extrusion mode of the specified material at a temperature of 438-443 K and created pressure of 4.0-5.0 MPa, with a fixed frequency of application of ultrasonic vibrations of 18, 19, 20, 22 and 24 kHz to the polymer melt in the molding zone.

The technological and economic efficiency of using the proposed two-channel extrusion head for the manufacture of a polymer furniture skid using ultrasonic vibrations is that it allows you to:

- to increase the productivity and quality of products due to the influence of ultrasonic vibrations on the mass of extrudable polymer in the molding zone;

- eliminate the unevenness of the extrudate output due to the symmetrical arrangement of the forming channels;

- to simplify the design of the extrusion head, as well as its assembly and disassembly.

Claims (1)

A two-channel extrusion head for the manufacture of a polymer furniture skid using ultrasonic vibrations, comprising a housing made of two sections with a cooling system, which form forming channels of profile section communicating with the feed channel of the head, and magnetostrictive radiators, characterized in that magnetostrictive are installed on the forming head transducers in the upper section above the profile grooves, the surface of which is formed in the form of a W-shaped profile, and the azhdeniya configured as three flow channels of rectangular cross section, symmetrically arranged in the upper section.

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