CN103722718A - PEEK plastic rod production device and process - Google Patents

Abstract

The invention discloses a PEEK plastic rod production equipment and process. The equipment includes a main machine and an auxiliary machine. The main machine is an extruder, which includes an extrusion system, a rotating system, and a control system; the extrusion system is a barrel screw; the rotating system includes a motor and a reduction box; The control system includes electrical instruments and actuators; the auxiliary machine includes molds, tractors, oil temperature machines, cutting machines, and ovens; ; The oil temperature machine is installed in the shaping section of the forming pipe; the tractor mainly includes a transmission device, a roller pressing device and a brake device, which is installed behind the heat preservation device; the cutting machine is installed in the mold outlet The latter; the oven is a sealed box; the process includes feeding, drying, plasticizing and extruding, homogenizing and splitting, forming/setting, traction, cutting board/stacking, and heat treatment.

Description

A kind of PEEK plastic bar production equipment and technology

technical field

The invention discloses a PEEK plastic rod production equipment and process.

Background technique

PEEK rod extrusion molding is to add granular materials into the barrel of the extruder from the hopper, and the materials are conveyed forward and compacted by the friction between the inner wall of the barrel and the surface of the screw under the extrusion force of the screw rotation. The heating device and friction preheating on the outside of the barrel melt and plasticize under high temperature and high pressure conditions. Then, the continuously rotating screw pushes the molten material into the mold of the die, and the molten material extruded from the die is cooled and shaped into the required PEEK product.

The previous production equipment and process are as follows:

PEEK rod extrusion molding production line is shown in Figure 1, the composition of the PEEK rod extrusion molding production line:

The production line of PEEK rod extrusion consists of two parts, the main machine and the auxiliary machine, which are called extrusion units. The main machine is an extruder, which consists of the following three parts: extrusion system, rotation system and control system. The extrusion system is a barrel screw, using a special equidistant gradual PEEK extrusion screw, the screw length-to-diameter ratio is 30:1, and the compression ratio is 3. The rotating system is mainly composed of a motor and a gearbox. The motor runs, and the reduction box is driven by the belt drive, so that the screw maintains a certain shear rate. The control system of the extruder is mainly composed of electrical instruments and actuators. Its main function is to control the main machine to make its operating speed and power normal, and to ensure the temperature, pressure, flow and product quality of the main machine and auxiliary machines, so as to realize the whole unit. automatic control. Auxiliary machine: The composition of the extruder depends on the type of product. Generally, the auxiliary machine consists of the following parts: single rod die, tractor, and cutting device. Mold: The mold is assembled by the flange, the head body, the shaping cylinder, and the cooling water tank; the molten raw material enters the head body under the action of the screw rotating and shearing, and turns the spiral molten material into a straight line under a certain pressure through the bell mouth. The mold enters the forming cylinder to be formed, solidified and shaped under the action of cooling water. The tractor is mainly composed of a transmission device, a roller pressing device and a brake device; it is installed behind the heat preservation device, and the mold and the tractor are fixed together through a connecting rod. The reducer drives the roller to keep the product at a certain pressure in the compression zone and move forward at a constant speed. The cutting machine is a bar cutting equipment, which is installed behind the outlet of the pipe mold. The extruded product passes through the cutting support surface of the cutting machine, cuts the bar through the high-speed rotation of the saw blade, and cuts it into the required length.

The production process of extrusion molding is: feeding → drying → plasticizing extrusion → forming/setting → traction → cutting/stacking.

⑴Feeding: Feed in time to ensure that the hopper is not empty. Different materials cannot be mixed. Pay attention to distinguish the grade and type of materials to prevent sundries and miscellaneous materials from entering the hopper and causing blockage of the discharge port.

⑵Drying: Due to the high temperature absorption of PEEK resin, it must be dried before extrusion molding to remove moisture, otherwise its moisture content exceeds a certain limit, and the moisture will evaporate into gas in the extruder barrel , so that the product contains pores inside, and the strength decreases. Use 130°C circulating hot air to dry the PEEK material, the drying time is 4-6H, so that the moisture content in the product is less than 0.2%.

(3) Plasticizing extrusion: through the action of barrel temperature and screw, the material is transformed into a uniform and continuous melt with certain fluidity and extruded. The barrel is heated in three zones, and the temperature is set according to the characteristics of the raw materials: the temperature of the feeding section in the first zone: 380-390°C; the temperature in the melting and compression section in the second zone: 390-400°C; ℃; Joint: 390-400℃; Extrusion screw speed: 4-6r/min.

⑷Forming/Sizing: The uniform melt with fluidity enters the mold through the perforated plate due to the rotary extrusion of the screw, and is formed and shaped according to a certain shape of the parison and then extruded out of the mold. ①The mold compression zone is divided into four zones for constant temperature, so that the melt can be molded with a certain viscosity, that is, the temperature of the head body: 320-330°C; ②Cooling circulating water is connected to both ends of the cooling and shaping zone of the mold. The circulation makes the temperature of the molten material decrease continuously, and finally solidifies and crystallizes and is extruded out of the mold.

⑸Traction: The PEEK rod is dragged by the tractor to make the rod move forward at a constant speed under constant pressure to ensure the stability of product quality.

⑹Cutting/Stacking: Use a tape measure to measure the length of 1000MM, start the cutting machine, cut out the required length, and stack the bars neatly on a specific stacking rack. There is a stainless square steel between the rod and the rod layer, and the square steel between the layers looks best to be in a straight line up and down.

Existing problems include: 1. Spots and black circles on the surface of the bar; 2. Wave marks and scratches on the surface; 3. Yellow core inside; 4. The color of the bar is yellowish; 5. Poor mechanical properties; 6. Serious bending of the bar ; 7, low production efficiency.

Contents of the invention

The purpose of the invention is to overcome the deficiencies in the prior art, and provide a kind of PEEK plastic rod production equipment and technology.

In order to achieve the above object, the present invention adopts the following technical solutions:

A kind of PEEK plastic bar production equipment, comprises main engine and auxiliary machine, and described main engine is an extruder, and it comprises extruding system, rotating system, control system; Described extruding system is barrel screw; Described rotating system It includes a motor and a gearbox; the control system includes electrical instruments and actuators; the auxiliary machine includes a mold, tractor, oil temperature machine, cutting machine, oven; the mold includes a main mold, deflector, heat insulation ring, forming and calibrating cylinder and cooling water tank; the oil temperature machine is installed in the calibrating section of the forming pipe; the tractor mainly includes a transmission device, a roller pressing device and a braking device, which is installed in the back of the heat preservation device; The cutting machine is installed behind the mold outlet; the oven is a sealed box.

Further, the extrusion system uses a dedicated equidistant gradual PEEK extrusion screw with a screw length-to-diameter ratio of 30:1 and a compression ratio of 3.

Further, the cutting machine is bar cutting equipment.

Another object of the present invention is to provide a kind of PEEK plastic rod production technique, comprising:

Feeding: Feed in time to ensure that the hopper is not empty, and different materials cannot be mixed;

Drying: Use 130°C circulating hot air to dry PEEK, the drying time is 4-6H, so that the moisture content in the product is less than 0.2%;

Plasticizing extrusion: through the action of barrel temperature and screw, the material is transformed into a uniform and continuous melt with certain fluidity and extruded;

Homogenization and diversion: the uniform melt with fluidity, due to the rotary extrusion of the screw, enters the main mold through the perforated plate, the melt is further homogenized in the main mold and the melt is changed from spiral motion to linear motion;

Forming/Sizing: ①The straight-line flowing melt is evenly flowed into the deflector from the outlet of the main mold, diverted through the V-shaped groove of the deflector, and enters the forming tube of the multi-rod forming mold respectively, and is formed in the forming tube; The homogenization temperature of the plate is 300°C; ②The oil temperature machine is installed at both ends of the shaping box of the forming tube, and the shape is shaped at a high temperature to ensure that the product can be extruded smoothly and the surface is smooth; the shaping temperature is 150-180°C;

Traction: A brake seat is installed at the exit of the mold, and the plate product is clamped by adjusting the tightness of the brake bar through the brake seat, so that the molten raw material forms a certain pressure in the compression zone, so that the structure of the extruded product is tight;

Cutting/Stacking: Use a tape measure to measure the length of 1000MM, start the cutting machine, cut out the required length, and stack the bars neatly on a specific stacking rack. There is a stainless square steel between the rod and the rod layer, and the square steel between the layers looks best in a straight line;

Heat treatment: Heat treatment of stacked PEEK rods.

Further, the plasticizing extrusion is divided into three zones to heat the barrel, and the temperature is set according to the characteristics of the raw materials: the temperature of the feeding section in the first zone: 355-370°C; the temperature in the melting and compression section of the second zone: 360-380°C; Zone homogenization section temperature: 360-380°C; Joint: 370-390°C; Extrusion screw speed: 8-10r/min.

Further, in the process of homogenization and splitting, the melt homogenization maintenance temperature, that is, the set temperature of the main mold is: the temperature of the first zone is 330-340°C; the temperature of the first two zones is 330-340°C; the temperature of the latter zone is 330-340°C; It is 330-340°C; the temperature in the second zone is 330-340°C.

Further, the heat treatment is divided into sixteen sections:

The first heating temperature is 40°C and the heating time is 20 minutes

The second constant temperature temperature is 70°C and the constant temperature time is 90 minutes

The third heating temperature is 70°C and the heating time is 20 minutes

The fourth section of constant temperature temperature 100 ℃ constant temperature time 90 minutes

The fifth heating temperature is 100°C and the heating time is 20 minutes

The sixth stage constant temperature temperature is 120°C and the constant temperature time is 90 minutes

The heating temperature of the seventh stage is 120°C and the heating time is 20 minutes

The eighth section constant temperature temperature 150 ℃ constant temperature time thickness * 2 * 30 minutes

The ninth stage cooling temperature is 150°C and the cooling time is 20 minutes

The tenth section constant temperature temperature is 120°C and the constant temperature time is 180 minutes

The cooling temperature of the eleventh stage is 120°C and the cooling time is 20 minutes

The twelfth section constant temperature temperature 100 ℃ constant temperature time 180 minutes

The thirteenth section cooling temperature 100 ℃ cooling time 20 minutes

The fourteenth section constant temperature temperature is 70°C and the temperature time is 180 minutes

The cooling temperature of the fifteenth section is 70°C and the cooling time is 20 minutes

The sixteenth stage constant temperature temperature is 40°C and the temperature time is 180 minutes.

Due to the adoption of the above scheme, the slight spots and black circles on the surface of the product are eliminated, making the surface of the product smooth, and the phenomenon of flow marks and scratches is greatly reduced; at the same time, its mechanical properties meet the requirements, and the internal stress of the bar is eliminated, and there will be no There is no bending phenomenon, there are no pores and yellow lines inside the bar, and the production efficiency has also been greatly improved.

Description of drawings

Fig. 1 is the structural representation of the PEEK plastic rod production equipment that the embodiment of the present invention provides;

Fig. 2 is the PEEK plastic rod production process flowchart that the embodiment of the present invention provides;

Among them: 1. Motor; 2. Gear box; 3. Hopper; 4. Oven; 5. Control system; 6. Barrel screw; 7. Rack; 8. Flange; 9. Connecting square plate; 10. Feeding 11, main mold; 12, mold frame; 13, deflector; 14, heat insulation ring; 15, cooling water tank; 16, traction machine; 17, cutting machine.

Detailed ways

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.

As shown in Figure 1-2, the present embodiment provides a kind of PEEK plastic rod production equipment, the composition of PEEK rod extruder forming production line, the production line of PEEK extruding includes main engine, auxiliary machine, and these parts are called extruder unit; The main engine is an extruder, which includes extrusion system, rotation system, and control system; the extrusion system is barrel screw 6, which adopts a special equidistant gradual PEEK extrusion screw, and the length-to-diameter ratio of the screw is 30:1. The compression ratio is 3; the rotation system includes a motor 1 and a gear box 2, and the motor 1 runs and drives the gear box 2 through a belt drive, so that the screw maintains a certain shear rate; the control system 5 of the extruder includes electrical instruments and actuators , its main function is to control the main engine so that its operating speed and power are normal, and to ensure the temperature, pressure, flow and product quality of the main engine and auxiliary equipment, so as to realize the automatic control of the whole unit; motor 1, gearbox 2, control system 5. The hopper 3 and the oven are set on the frame 7; auxiliary machine: the composition of the extruder is determined according to the type of product, and the general auxiliary machine is composed of the following parts: mold, tractor, oil temperature machine, cutting machine , oven 4; mold includes main mold 11, deflector plate 13, heat insulation ring 14, forming shaping tube, cooling water tank 15, flange 8; mold is located on the mold frame 12; feeding port 10 is located near main mold 11 side There is a connecting square plate 9, the molten raw material enters the main mold through the feed port 10, and the two sides of the diversion block of the inlet channel are divided, and the divided molten raw material enters the eight bell mouths of the guide plate and the forming cylinder under a certain pressure. Forming and shaping under a certain pressure and constant oil temperature; the oil temperature machine is installed in the shaping section of the forming pipe, and the hot oil is continuously circulated to make the products in the shaping area shaped at a constant and balanced temperature and smoothly extruded from the mold; Tractor 16 is mainly made up of transmission device, roller pressing device and braking device. Installed behind the heat preservation device, the mold and the tractor are fixed together through the connecting rod, the four pairs of rollers on the upper and lower sides of the tractor are controlled by air to press the plate, and the reducer drives the roller to keep the product at a certain pressure in the compression zone and move forward at a constant speed; the cutting machine 17 is bar cutting equipment, which is installed behind the mold outlet. The extruded product passes through the cutting support surface of the cutting machine, cuts the bar through the high-speed rotation of the saw blade, and cuts into the required length product; the oven is a sealed box , through the temperature controller, set different temperatures, and heat-treat the product in multiple stages at different times to eliminate the residual internal stress of the product and ensure product quality and stability.

Another object of the present invention is to provide a production process for PEEK plastic rods. The production process of extrusion molding includes: feeding, drying, plasticizing extrusion, homogenizing and splitting, forming/setting, traction, cutting boards/stacking material, heat treatment. ⑴ Feeding: Feed in time to ensure that the hopper is not empty. Different materials cannot be mixed, pay attention to distinguish the grade and type of materials, and prevent sundries and miscellaneous materials from entering the hopper, causing the discharge port to be blocked. ⑵Drying: Due to the high temperature absorption of PEEK resin, it must be dried before extrusion molding to remove moisture, otherwise its moisture content exceeds a certain limit, and the moisture will evaporate into gas in the extruder barrel , so that the inside of the product contains pores, and the strength decreases; the PEEK is dried by circulating hot air at 130°C, and the drying time is 4-6H, so that the moisture content in the product is lower than 0.2%. (3) Plasticizing extrusion: through the action of the temperature of the barrel and the screw, the material is transformed into a uniform and continuous melt with a certain fluidity and extruded; the barrel is heated in three zones, and the temperature is set according to the characteristics of the raw material: 1. The temperature of the feeding section in the zone: 355-370°C; the temperature of the melting and compression section in the second zone: 360-380°C; the temperature of the homogenizing section in the third zone: 360-380°C; the joint: 370-390°C; the extrusion screw speed: 8-10r /min. ⑷ Homogenization and diversion: the uniform melt with fluidity enters the main mold through the perforated plate due to the rotary extrusion of the screw, and the melt is further homogenized in the main mold and the melt is changed from spiral motion to linear motion: ① melt Homogenization holding temperature, that is, the set temperature of the main mold: the temperature of the first zone: 330-340℃; the temperature of the first two zones: 330-340℃; the temperature of the latter zone: 330-340℃; . ⑸Forming/Sizing: ①The straight-line flowing melt is evenly flowed into the deflector from the outlet of the main mold, diverted through the V-shaped groove of the deflector, and enters the forming tube of the multi-rod forming mold respectively, and is formed in the forming tube; Flow plate homogenization temperature: 300°C; ② An oil temperature machine is installed at both ends of the shaping box of the forming tube to shape at high temperature to ensure that the product can be extruded smoothly and the surface is smooth; shaping temperature: 150-180°C. ⑹ Traction device: There is a brake seat at the exit of the mold, and the plate product is clamped by adjusting the tightness of the brake bar through the brake seat, so that the molten raw material forms a certain pressure in the compression zone, so that the structure of the extruded product is tight. ⑺Cutting/Stacking: Use a tape measure to measure the length of 1000MM, start the cutting machine, cut out the required length, and stack the bars neatly on a specific stacking rack. There is a stainless square steel between the rod and the rod layer, and the square steel between the layers looks best to be in a straight line up and down. ⑻ Oven heat treatment: When heat treating the stacked PEEK rods, it is mainly divided into sixteen sections:

The first heating temperature is 40°C and the heating time is 20 minutes

The second constant temperature temperature is 70°C and the constant temperature time is 90 minutes

The third heating temperature is 70°C and the heating time is 20 minutes

The fourth section of constant temperature temperature 100 ℃ constant temperature time 90 minutes

The fifth heating temperature is 100°C and the heating time is 20 minutes

The sixth stage constant temperature temperature is 120°C and the constant temperature time is 90 minutes

The heating temperature of the seventh stage is 120°C and the heating time is 20 minutes

The eighth section constant temperature temperature 150 ℃ constant temperature time thickness * 2 * 30 minutes

The ninth stage cooling temperature is 150°C and the cooling time is 20 minutes

The tenth section constant temperature temperature is 120°C and the constant temperature time is 180 minutes

The cooling temperature of the eleventh stage is 120°C and the cooling time is 20 minutes

The twelfth section constant temperature temperature 100 ℃ constant temperature time 180 minutes

The thirteenth section cooling temperature 100 ℃ cooling time 20 minutes

The fourteenth section constant temperature temperature is 70°C and the temperature time is 180 minutes

The cooling temperature of the fifteenth section is 70°C and the cooling time is 20 minutes

The sixteenth stage constant temperature temperature is 40°C and the temperature time is 180 minutes.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related All technical fields are equally included in the scope of patent protection of the present invention.

Claims (7)

1. a PEEK sticking plaster production equipment, comprises main and auxiliaries, it is characterized in that, described main frame is an extruder, and it comprises extrusion system, rotation system, control system; Described extrusion system is gun barrel screw rod; Described rotation system comprises motor and reduction box; Described control system comprises electrical instrumentation and executing agency; Described subsidiary engine comprises mould, hauling machine, oil temperature machine, cutting machine, baking box; Described mould comprises main mould, deflector, insulating collar, moulding sizing cylinder and cooling water tank; Described oil temperature machine is arranged on the sizing section of formed pipe; Described hauling machine mainly comprises transmission device, roller hold down gag and braking device, it be arranged on attemperator after; Described cutting machine is arranged on after mould outlet; Described baking box is the casing of sealing.

2. PEEK sticking plaster production equipment as claimed in claim 1, is characterized in that, described extrusion system adopts special-purpose equidistant gradation type PEEK extrusion screw rod, and screw slenderness ratio is 30:1, and compression ratio is 3.

3. PEEK sticking plaster production equipment as claimed in claim 2, is characterized in that, described cutting machine is bar cutting equipment.

4. a PEEK sticking plaster production technology, is characterized in that, it comprises:

Feed intake: feed intake in time, guarantee that hopper is not empty, different material can not be used with;

Dry: adopt 130 ℃ of circulating airs to be dried PEEK, be 4-6H drying time, make water content in product lower than 0.2%;

Plasticizing is extruded: by the effect of barrel zone temperature and screw rod, material changes the process that evenly melt is extruded continuously with certain fluidity into;

Homogenizing shunting: there is the improving uniformity of melt of mobility, because the rotary squeezing of screw rod enters main mould by porous plate, melt body further homogenizing and transfer melting material to rectilinear motion by screw in main mould;

Moulding/sizing: the 1. melt of streamlined flow, by main mould outlet, evenly flowed into deflector, by the V-type groove of deflector, shunt, enter respectively the formed pipe of how excellent shaping mould, moulding in formed pipe; Deflector homogenization temperature is 300 ℃; 2. the sizing tank ends at formed pipe is equipped with oil temperature machine, under the condition of high temperature, shapes, and guarantees that goods can be extruded and surface smoothness smoothly; Setting temperature is 150-180 ℃;

Traction: brake mount is equipped with in the exit position at mould, regulates the degree of tightness of brake article and clamping plate material products makes the raw material of melting in compressional zone, form certain pressure by brake mount, makes the close structure of extruded product;

Cutting plate/windrow: measure 1000MM length with tape measure, start cutting machine, cut out needed length, bar is neatly overlayed on specific rickstand.Between rod and rod layer, be placed with stainless square steel, square steel between layers seems preferably point-blank up and down;

Heat treatment: heat-treat stacking the PEEK rod of having piled.

5. PEEK sticking plaster production technology as claimed in claim 4, is characterized in that, described plasticizing is extruded Fen San district machine barrel is heated, according to raw material characteristics design temperature: district's feeding section temperature a: 355-370 ℃; Two melting compression section, district temperature: 360-380 ℃; Three district's homogenizing zone temperature: 360-380 ℃; Joint: 370-390 ℃; Extrusion screw rod speed: 8-10r/min.

6. PEEK sticking plaster production technology as claimed in claim 4, is characterized in that, in described homogenizing shunting process, melts body homogenizing and keeps temperature, and main mould design temperature is: last district temperature is 330-340 ℃; The first two district's temperature is 330-340 ℃; Hou Yi district temperature is 330-340 ℃; Hou Er district temperature is 330-340 ℃.

7. PEEK sticking plaster production technology as claimed in claim 4, is characterized in that, described heat treatment is divided into 16 sections:

First paragraph is heated 40 ℃ of 20 minutes heating-up times of temperature

70 ℃ of constant temperature times of second segment thermostat temperature 90 minutes

The 3rd section of temperature 70 C warm-up time 20 minutes of heating

100 ℃ of constant temperature times of the 4th section of thermostat temperature 90 minutes

The 5th section of 100 ℃ of warm-up times of temperature 20 minutes of heating

120 ℃ of constant temperature times of the 6th section of thermostat temperature 90 minutes

The 7th section of 120 ℃ of warm-up times of temperature 20 minutes of heating

150 ℃ of constant temperature time thickness * 2*30 minute of the 8th section of thermostat temperature

150 ℃ of temperature fall times of the 9th section of cooling temperature 20 minutes

120 ℃ of constant temperature times of the tenth section of thermostat temperature 180 minutes

120 ℃ of temperature fall times of the 11 section of cooling temperature 20 minutes

100 ℃ of constant temperature times of the 12 section of thermostat temperature 180 minutes

100 ℃ of temperature fall times of the 13 section of cooling temperature 20 minutes

70 ℃ of 180 minutes sad temperature times of the 14 section of thermostat temperature

The 15 section of cooling temperature 70 C temperature fall time 20 minutes

40 ℃ of 180 minutes warm times of the 16 section of thermostat temperature.

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