CN110103401A - Ultrasound plasticizing Micro Injection Molding Machines main body and forming method - Google Patents

Abstract

The invention discloses a kind of ultrasound plasticizing Micro Injection Molding Machines main body and forming method, main body includes quantitative feeding module, ultrasound plasticizing module, metering module, injection module and closing unit；Quantitative feeding module includes parallel moving mechanism, rotating mechanism, charging pressure assembly and barrel component, and the one end for feeding pressure assembly extends in barrel component, the other end is connected with rotating mechanism, and rotating mechanism is connected on parallel moving mechanism；The entrance of ultrasound plasticizing module is connected to quantitative feeding module, exports and be connected to metering module；Metering module includes measuring room, metering plunger, displacement sensor, pressure sensor and driving mechanism, measuring room one end is connected to closing unit, the axial centre for measuring plunger is equipped with through-hole, and metering plunger is set to the measuring room other end and is connected with driving mechanism, and measuring room is connected to runner；Injection module includes injection piston, driving assembly, and one end of injection piston extends in measuring room across metering plunger, the other end is connected with driving assembly.

Description

Ultrasound plasticizing Micro Injection Molding Machines main body and forming method

Technical field

The invention belongs to advanced molding manufacturing field, more particularly to a kind of ultrasound plasticizing Micro Injection Molding Machines main body and at Type method.

Background technique

Currently, micro-nano product has been widely used for the numerous areas such as aerospace, military affairs, auto industry, microinjection at Typical Representative of the type technology as minute manufacturing technology, relative to micro shapings such as hot pressing, chemical etching, LIGA, fine electric sparks The micro injection molding of technology, polymer has the advantages such as low cost, mass, high-precision.

And traditional micro injection molding technology is there are fusion time is long, one time plastics capacity is excessive, injection volume and micro- volume of part Serious the problems such as mismatching, result in that Forming Quality stability is poor, and waste of raw materials is serious.Ultrasonic plastifying technology can improve poly- The mobile performance of polymer melt, obtains better filling effect, and it is excellent to have that shaping efficiency is high, plasticizing quality is good, low energy consumption etc. Gesture realizes " charging, low head injection on demand ", and application potential is huge.

But Ultrasonic probe has both the function of plasticizing and injection, and tool in ultrasound plasticizing equipment at present on the market Head and plasticizing chamber belong to clearance fit, and tool heads is caused to cause to aggravate with plasticizing chamber wall friction when carrying out dynamic plasticizing and injection molding, It is easy to cause wear phenomenon, substantially reduces the service life of tool heads.And there is also following deficiencies for existing equipment:

1, charging aspect: occurring particle during polymer-filled and splash out phenomenon, no to be plasticized preceding thick metrology steps, to modeling Change amount is not estimated well；Tool heads have both plasticizing and melt conveying, mode do not consider simply the abrasion conditions of components with The maintenance of subsequent key component substitutes.

2, ultrasound plasticizing aspect: plasticizing chamber is connected to mould core chamber, and no particular valve is able to carry out barrier, is only capable of using The injection molding in plasticizing；Under plunger effect, the residual polymerization composition granule not being plasticized completely polymerize with what is be plasticized completely Object melt is fills up to mould core chamber together, and it is bad to easily lead to Forming Quality.

3, injection aspect: though realizing quick plasticizing by ultrasonic plasticizing advantage, consider after being plasticized to polymer Melt carries out delicate metering, causes in the molded part obtained after injection fillers mould core chamber, and waste material accounting is still very big.

Summary of the invention

The purpose of the present invention is to solve the shortcomings of the prior art place, provides one kind and had not only been able to achieve quantitative feeding but also energy reality The ultrasound plasticizing Micro Injection Molding Machines main body of existing metered shot.

This ultrasound plasticizing Micro Injection Molding Machines main body provided by the invention, it includes quantitative feeding module, ultrasound plasticizing Module, metering module, injection module and closing unit；Quantitative feeding module includes parallel moving mechanism, rotating mechanism, charging pressure group Part and barrel component, the one end for feeding pressure assembly extends in barrel component, the other end is connected with rotating mechanism, rotating mechanism company It is connected on parallel moving mechanism；Ultrasound plasticizing module includes plasticizing chamber, and plasticizing chamber is externally provided with heating component, is plasticized the entrance of chamber and quantitative Feed module connection, outlet are connected to metering module；Metering module includes measuring room, metering plunger, displacement sensor, pressure biography Sensor and driving mechanism, the both ends of measuring room are opening, and one end is connected to closing unit, and the axial centre for measuring plunger is equipped with Through-hole, metering plunger are set to measuring room other end end, are connected with driving mechanism, and displacement sensor is connected to metering plunger Outside, pressure sensor is set between metering plunger and driving mechanism, and measuring room is connected to the runner of connecting block；Injection module packet Include injection piston, driving assembly, one end of injection piston pass through metering plunger extend in measuring room, the other end of injection piston with Driving assembly is connected.

In a specific embodiment, make the parallel moving mechanism screw slide；The rotating mechanism includes stepping electricity Machine and motor cabinet, motor cabinet are the rectangle seat of top end opening, and the bottom end of motor cabinet is equipped with through-hole, and stepper motor is assemblied in motor cabinet Interior, the output shaft of stepper motor is connected after passing through through-hole with flexible coupling, and rotating mechanism is assemblied in the cunning with its motor cabinet Outside platform；The charging pressure assembly includes quantitative conveying lever, transiting rod, connecting shaft and pressure plunger, one end of quantitative conveying lever Be connected by transiting rod with pressure plunger, the other end is connected with connecting shaft, feed pressure assembly with its connecting shaft and flexibility shaft coupling Device is connected.

Further, making the quantitative conveying lever includes bar main body, equidistant helical blade and stop collar, bar main body packet Major diameter section, conical section and path section are included, the outer end of major diameter section is equipped with threaded hole, and the outer end of path section is equipped with thread head, helical-blade Piece is axially disposed in outside path section, and stop collar is the soft ring flat-plate being set to outside path section, at helical blade root position；Institute The outer wall for stating one end of the connecting shaft is equipped with screw thread, and one end of connecting shaft is connect with bar main body screw, the other end and flexible coupling phase Even；The pressure plunger is cylindrical type plug, and outer diameter is greater than the outer diameter of transiting rod, and top is equipped with threaded hole, and outer wall is equipped with A pair is in annular groove arranged up and down to prevent melt adverse current；One end of the transiting rod is equipped with threaded hole, and the other end is equipped with screw thread Head, screw thread nose end are connected with bar main body screw head, and screw thread head end is connect with pressure plunger screw.

Preferably, the barrel component is made to include barrel, transitional cylinder and cartridge holder；The side wall of barrel is equipped with charging Mouthful, feed inlet is externally connected with blanking component, and blanking component includes hopper, feeding cylinder, feed screw and motor, the bottom end of hopper with Feeding cylinder connection, feeding cylinder is in tilted layout, its low side is connected to feed inlet, and feed screw is axially disposed in feeding cylinder, electric The output shaft of machine is connected with feed screw；The both ends of transitional cylinder are equipped with the connection ring of evagination, and connection ring is equipped with mounting hole；Institute The bottom end for stating barrel is equipped with the terminal pad of evagination, and terminal pad is equipped with connecting hole；Barrel by pass through mounting hole, cartridge holder and The bolt of connecting hole cooperates corresponding nut fastening.

For the ease of assembly, making the quantitative feeding module further includes linear bearing and linear bearing bracket；Linear bearing Internal diameter and the outer diameter of transiting rod match；Linear bearing bracket includes positioning sleeve and mounting rod, and a pair of of mounting rod is symmetrically affixed Through-hole is equipped in the outer end of the outer wall of positioning sleeve, mounting rod；Linear bearing is assemblied in positioning sleeve, and linear bearing bracket is by wearing The fastener for crossing through-hole is anchored on the bottom end of transitional cylinder；The screw thread head end of the transiting rod pass through linear bearing bracket after with pressure Plunger is connected.

In a specific embodiment, making the ultrasound plasticizing module further includes Ultrasonic probe, rotary valve, connecting block With class ball valve；The both ends of plasticizing chamber be opening, bottom side wall be equipped with recirculation hole, set runner, heating component in connecting block It is placed on rotary valve outside plasticizing chamber, rotary valve is located at recirculation hole, heating component is located at the top of rotary valve, the valve of class ball valve Bar extends in runner, Ultrasonic probe from bottom end protrude into plasticizing it is intracavitary, be plasticized chamber bottom end be anchored under linear bearing bracket with Transitional cylinder connection.

Preferably, the plasticizing chamber is made to include conical section and cylindrical section, the bigger diameter end of conical section is connected to transitional cylinder, is small Diameter end is linked together with cylindrical section, and recirculation hole is located at cylindrical section bottom；The heating component includes heat transfer jacket, heating sheet and heat-insulated Component, heat transfer jacket are placed on outside cylindrical section, and heating sheet is affixed in heat transfer jacket, and insulating assembly is coated on outside heat transfer jacket；The connecting block For square type block, one end is equipped with the perforative ladder hole of through-thickness, and one end of the runner is connected to ladder hole, is another End extends to outside connecting block；Whether the rotary valve is located in the major diameter section of ladder hole, connect for controlling plasticizing chamber with runner It is logical；The class ball valve is assemblied in outside connecting block, valve rod extends in runner.

Preferably, the driving mechanism is identical as driving assembly structure, it include bracket, stepper motor, shaft coupling, silk Bar and nut seat, bracket are door type frame, and the side of bracket is embedded with bearing, and stepper motor is assemblied in outside the other side of bracket, it is led Axis, which extends in bracket, to be connected by shaft coupling with screw rod, and the other end of screw rod is assembled in bearing, and nut seat is threadedly connected to silk Outside bar；The metering plunger is connected with corresponding nut seat respectively with injection piston.

In a specific embodiment, making the closing unit includes mold core, dynamic model component, cover half component and pushing tow group Part；Dynamic model component includes moving template and dynamic mould fixing plate, and moving template fixed plate is square type plate, and center position is logical equipped with thimble Road, linear bearing is embedded at corner location, and outer end is equipped with notch and dynamic model fixing piece for installing moving template；Cover half Component includes solid plate, cover half fixed plate and injection head, and solid plate fixed plate is square type plate, its middle part equipped with stepped hole, cover half Fixed plate is in the major diameter section of stepped hole, and injection head is in path section；Pushing tow component includes thimble, guide post and pushes away Bar, thimble extend in thimble channel, and push rod is affixed with dynamic mould fixing plate, guide post pass through linear bearing after with cover half fixed plate phase Even, cover half fixed plate and dynamic mould fixing plate surround mold core cavities, and mold core is placed in mold core cavities；Closing unit is connected to the metering mould Block is outer, is connected to its injection head with measuring room；Mold core cavity region is corresponded in the dynamic mould fixing plate equipped with heating sheet.

The present invention also provides a kind of ultrasound plasticizing micro injection molding method, this method is plasticized micro- note using above-mentioned ultrasound Shaping machine main body is penetrated as tool progress, comprising the following steps:

Step 1: starting heating component, gives plasticizing chamber heating, assisting ultrasonic plasticizing；

Step 2: control plasticizing chamber is in close state, quantitative feeding is realized in rotating mechanism work, is translatable after the completion of charging Mechanism works and opens ultrasonic wave instruction, and charging pressure assembly continues slowly to be displaced to keep enough plasticizing pressures, polymer Particle starts to be plasticized；

Step 3: opening plasticizing chamber, connecting block is heated to the condition of high temperature to keep by heating sheet at this time after the completion of plasticizing The molten mass state of polymer, polymer melt enter metering module through connecting block runner under the pressure effect of pressure plunger；

Step 4: polymer melt enters measuring room, driving mechanism driving metering plunger retracts, when back pressure reaches setting Value obtains molded part polymer melt aequum according to PVT curve and displacement sensor, stops melt conveying, and metering finishes, Injection piston is matched with measuring room front end injection canal at this time, i.e. injection canal is not connected to measuring room, melt be fully populated in In measuring room；

It is displaced Step 5: controlling injection ram rollback segment by driving assembly, at this time injection ram and measuring room front end Injection canal is detached from hole axle cooperation, i.e., injection canal is connected to measuring room, and driving assembly control metering plunger anterior displacement will be counted The melt extrusion finished is measured to measuring room front end injection canal, last driving assembly control metering piston melts polymer Body is squeezed into injection canal；

It is displaced in injection canal Step 6: driving assembly continues control injection ram, will be gathered under certain speed Polymer melt is injected in the type chamber in closing unit；

Step 7: polymer melt, during filling mold cavity, injection ram is first displaced with constant speed and is filled, to When mold filling to certain proportion, it is switched to pressure control, injection ram is switched to constant pressure injection at this time, completes polymer melting The filling pressure maintaining of body；

Step 8: it is cooling, it repeats the above steps after die sinking pickup and carries out the movement in next period.

The present invention is when in use inputted polymer beads by barrel component, and polymer beads are cached in quantitative conveying lever On, it is then worked by rotating mechanism and drives charging pressure assembly rotation, the polymerization being cached in rotation process on quantitative conveying lever The plasticizing that lower part is advanced under composition granule is quantitative is intracavitary, the rotating machine when being plasticized intracavitary polymer beads quantity and reaching requirement Structure stops operating, and quantitative conveying lever stops conveying polymer beads, realizes the quantitative feeding (thick metering) to polymer beads, real The automatic ration material feeding function for having showed ultrasonic plasticizing reduces manual feed time significantly and estimates conveying to material requested, can be real The continuous automatic production of existing product；Parallel moving mechanism works after the completion of feeding, and parallel moving mechanism drives rotating mechanism and charging to apply Component entirety downlink is pressed, the plunger downlink that presses and after keeping enough plasticizing pressures, polymer beads be plasticizeds completely, polymer melts Body enters in measuring room, and metering plunger is pushed to retract, and measures polymer melt body known to rollback displacement by displacement sensor Product, after reaching designated volume, injection module work, injection ram movement injects polymer melt in closing unit.To To realize the thick metering and the accurate measurement of polymer melt injection of polymer beads, and closing unit is cooperated to complete micro-nano system The molding of part.

Detailed description of the invention

Fig. 1 is the axonometric schematic diagram of a preferred embodiment of the invention.

Fig. 2 is the cutaway enlargement diagram of quantitative feeding module in the present embodiment.

Fig. 3 is the enlarged diagram that pressure assembly and barrel component are fed in the present embodiment.

Fig. 4 is the elevational schematic view of ultrasound plasticizing module in the present embodiment.

Fig. 5 is the cutaway enlargement diagram in Fig. 4 at B-B.

Fig. 6 is the enlarged diagram of heating component in the present embodiment.

Fig. 7 is the cutaway enlargement diagram of metering module in the present embodiment.

Fig. 8 is back pressure PID control strategy schematic diagram.

Fig. 9 is the schematic cross-sectional view of closing unit in the present embodiment.

Illustrate serial number:

1-quantitative feeding module,

11-parallel moving mechanisms,

12-rotating mechanisms, 121-motor cabinets, 122-stepper motors,

13-charging pressure assemblies,

131-quantitative conveying levers, 1311-bar main bodys, 1312-helical blades, 1313-stop collars,

132-transiting rods, 133-connecting shafts, 134-pressure plungers, 1341-annular grooves,

14-barrel components,

141-barrels, 1411-terminal pads,

142-transitional cylinders, 1421-connection rings,

143-cartridge holders, 144-linear bearing brackets, 145-linear bearings,

146-blanking components, 1461-hoppers, 1462-feeding cylinders, 1463-feed screws, 1464-charging motors；

2-ultrasound plasticizing modules,

21-Ultrasonic probes,

22-plasticizing chambers, 221-recirculation holes,

23-heating components, 231-heat transfer jackets, 232-heating sheets, 233-insulating assemblies,

24-connecting blocks, 241-runners,

25-rotary valves, 251-valve bodies, 252-otic placodes,

26-class ball valves, 261-valve rods,

27-collets, 28-pen cylinders, 29-rotary cylinders；

3-metering modules,

31-measuring rooms, 32-metering plungers, 33-displacement sensors, 34-pressure sensors,

35-driving mechanisms, 351-brackets, 352-motors, 353-shaft couplings, 354-screw rods, 355-nut seats, 356-sliding blocks；

4-injection modules, 41-injection pistons, 42-driving assemblies；

5-closing units,

51-pushing tow components, 511-thimbles, 512-guide posts, 513-push rods, 514-pedestals,

52-dynamic model components, 521-moving templates, 522-dynamic mould fixing plates, 523-dynamic model fixing pieces,

53-cover half components, 531-solid plates, 532-cover half fixed plates, 533-injection heads.

Specific embodiment

As shown in Figure 1, this ultrasound plasticizing Micro Injection Molding Machines main body disclosed in the present embodiment, including quantitative feeding module 1, ultrasound plasticizing module 2, metering module 3, injection module 4 and closing unit 5.

As shown in Fig. 2, quantitative feeding module 1 includes parallel moving mechanism 11, rotating mechanism 12, charging pressure assembly 13 and barrel Component 14, wherein parallel moving mechanism 11 is screw slide, and rotating mechanism 12 is connected on slide unit, feeds pressure assembly 13 and rotating machine Structure 2 is connected, and the bottom end for feeding pressure assembly passes through barrel component 14 and extends in the plasticizing chamber 22 of ultrasound plasticizing module 2.

As shown in Fig. 2, rotating mechanism 12 includes motor cabinet 121 and stepper motor 122, motor cabinet 121 is top end opening Rectangle seat, bottom end are equipped with through-hole, and stepper motor 122 is assemblied in motor cabinet, and the output shaft of stepper motor leads to after passing through through-hole Flexible coupling 16 is crossed to be connected with charging pressure assembly 13；Rotating mechanism is assemblied in outside slide unit by motor cabinet.

As shown in Figure 2 and Figure 3, charging pressure assembly 13 includes quantitative conveying lever 131, transiting rod 132, connecting shaft 133 and applies Hydraulic plunger 134.Quantitative conveying lever 131 includes bar main body 1311, equidistant helical blade 1312 and stop collar 1313, bar main body Including major diameter section A, conical section B and path section C；The outer end of major diameter section is equipped with threaded hole, to be connected with connecting shaft 133, accordingly The outer wall in 133 one end of connecting shaft be equipped with screw thread, one end of connecting shaft connect with bar main body screw, the other end and flexibility shaft coupling Device 16 is connected；Conical section plays sealing process to the feed inlet on barrel in quantitative conveying lever downlink, can also will remain in Barrel and the particle of feeding-passage connectivity part squeeze back in channel；The outer end of path section is equipped with thread head, is used for and transiting rod 132 It is connected；Helical blade is axially disposed in outside path section, and stop collar 313 is to be set to that path section is outer, helical blade root position The rubber ring flat-plate at place.One end of transiting rod 132 is equipped with threaded hole, and the other end is equipped with thread head, the spiral shell of screw thread nose end and bar main body Line head is connected, and screw thread head end is threadedly coupled with pressure plunger 134.Pressure plunger 134 is cylindrical type plug, and outer diameter is greater than transiting rod Outer diameter, top is equipped with threaded hole to be connected with transiting rod, outer wall be equipped with it is a pair of be in annular groove 1341 arranged up and down with Anti- melt adverse current.

Pressure assembly generally elongate rod is fed, each rod piece is assembly parts, by way of transiting rod and threaded connection So that in actual use length adjustment can be carried out according to single unit system structure, and reduce difficulty of processing；Pressure plunger is rapid wear Part needs to regularly replace, will pressure plunger and transiting rod also using being threadedly coupled by the way of, realization need to be only individually replaced when replacing Press plunger, without replacing entire rod piece, reduces replacement difficulty and also reduces use cost, can also be arranged to pressure plunger A series of product of different models meets ultrasonic plasticizing process later period seriation requirement.

As shown in figure 3, barrel component 14 includes barrel 141, transitional cylinder 142 and cartridge holder 143；Barrel 141 is both ends The cylindrical type cylinder of opening, side wall are equipped with feed inlet 1411, and bottom end is equipped with the terminal pad 1412 of evagination, sets in terminal pad There is connecting hole, feed inlet is externally connected with blanking component 146, and blanking component includes hopper 1461, feeding cylinder 1462, feed screw 1463 and motor 1464, the bottom end of hopper be connected to feeding cylinder, feeding cylinder be in tilted layout, its low side be connected to feed inlet, charging Screw rod is axially disposed in feeding cylinder, and the output shaft of motor is connected with feed screw；Transitional cylinder 142 be cylinder type tube, two End is equipped with the connection ring 1421 of evagination, and connection ring is equipped with mounting hole；Cartridge holder 143 includes ring flange 1431 and is fixed in A pair of of linking arm 1432 outside ring flange；The top of transitional cylinder and barrel pass through the spiral shell across mounting hole, ring flange and connecting hole Bolt cooperates corresponding nut fastening, and the bottom end of transitional cylinder is connected with linear bearing bracket 144, and linear bearing bracket 144 includes fixed Position set 1441 and mounting rod 1442, a pair of of mounting rod are symmetrically fixed in the outer wall of positioning sleeve, and the outer end of mounting rod is equipped with through-hole, fixed Linear bearing 145, the bottom end that linear bearing bracket is anchored on transitional cylinder by passing through the fastener of through-hole are equipped in the set of position；Transition The screw thread head end of bar is connected after passing through linear bearing with pressure plunger.Pressure assembly is fed with the linear bearing bracket at the top of it 144 are connected with ultrasound plasticizing module 2.

As shown in Figure 4, Figure 5, ultrasound plasticizing module 2 includes Ultrasonic probe 21, plasticizing chamber 22, heating component 23, linking Block 24, rotary valve 25 and class ball valve 26.Wherein plasticizing chamber 22 is the single piece of both ends open, including conical section and cylindrical section, cone The bigger diameter end of shape section is connected to transitional cylinder, miner diameter end and cylindrical section are linked together, and the side wall of cylindrical section is equipped with recirculation hole 221. Heating component 23 as shown in Figure 6 includes heat transfer jacket 231, heating sheet 232 and insulating assembly 233；Heat transfer jacket 231 is square sleeve, Interior to be equipped with the circular hole for being matched with cylindrical section, heating sheet 232 selects silica gel heating sheet, and heating sheet has four, is affixed on heat transfer jacket respectively Four side walls outside；Insulating assembly 233 includes two long slabs and two short slabs, and two long slabs are respectively arranged at outside a pair of sidewalls of heat transfer jacket, Two short slabs and another pair side wall are fitted and connected between two long slabs.Connecting block 24 is square type block, and one end is equipped with through-thickness Perforative stepped hole, the major diameter section of stepped hole is interior to be equipped with collet 27, and the side wall of collet is equipped with through-hole, and connecting block is interior along length It spends direction and is equipped with runner 241, one end of runner is connected to through-hole on collet, the other end is through connecting block, and under connecting block Heating sheet is posted at corresponding runner position, while being equipped with the side opening being connected to runner in connecting block for installing class ball valve.Rotation Rotary valve 25 be single piece comprising valve body 521 and otic placode 252, valve body 251 are assemblied in collet, the outer end of otic placode and The pen cylinder 28 being set to outside heating component is connected, and is the rotation of valve body by the transform linear motion of pen cylinder.Class ball Valve 26 is extended in runner with its valve rod 261 from side opening, and controls the rotation of valve rod by rotary cylinder 29 to control opening for runner It closes.Ultrasound plasticizing module 2 at the top of plasticizing chamber by being assemblied under linear bearing bracket 144.

As shown in fig. 7, metering module 3 includes measuring room 31, metering plunger 32, displacement sensor 33, pressure sensor 34 With driving mechanism 35.Measuring room 31 is the cylinder of both ends open, and one end end is equipped with the through-hole being connected to connecting block runner；Meter Amount plunger 32 is T-type plug, interior to be equipped with axially extending bore；Driving mechanism 35 includes bracket 351, motor 352, shaft coupling 353, screw rod 354 and nut seat 355, bracket is door type frame, and the side of bracket is embedded with bearing, stepper motor is assemblied in outside the other side of bracket, Its main shaft, which extends in bracket, to be connected by shaft coupling with screw rod, and the other end of screw rod is assembled in bearing, and nut seat is threadedly coupled In outside screw rod；The metering plunger is connected with corresponding nut seat respectively with injection piston, and sliding block 356 is equipped on nut seat, Pressure sensor 34 is set between sliding block and metering plunger 32, and displacement sensor 33 is assemblied in metering plunger by mounting rack 34 On 32.Move back control to measuring plunger by back pressure PID control strategy simultaneously, stable back pressure value to be achieved and according to When required melt amount is calculated in PVT curve, stop polymer melt conveying, metering plunger stops, and completes meter action.Such as Shown in Fig. 8, back pressure PID control strategy: the fixed back pressure value P0 of artificial setting one, polymer melt are defeated from ultrasound plasticizing module first Send the back pressure value for measuring plunger front end to metered shot module increasing, when practical back pressure value is lower than setting back pressure value, meter Amount is not rotated with servo motor, and metering plunger stands fast.When practical back pressure value is more than setting back pressure value, servo motor is used in metering By rotation so that metering plunger moves back, displacement sensor is also started to work in this stage.It controls obtained final effect: Practical back pressure value is stablized near setting back pressure value.Because needing quickly to respond to pressure value, the control algolithm of this principle use For PID control.Injection module 4 includes injection piston 41 and driving assembly 42, and driving assembly 42 is identical as 35 structure of driving mechanism, In assembly, one end of injection piston is extended in measuring room, the through-hole of sealing type measuring room side wall across metering plunger, inject column The other end of plug is connected with the nut seat of driving assembly；Closing unit is assemblied in outside measuring room.

As shown in figure 9, closing unit 5 includes mold core 51, dynamic model component 52, cover half component 53 and pushing tow component 54.Dynamic model Component 52 includes moving template 521 and dynamic mould fixing plate 522, and moving template fixed plate is square type plate, and center position is equipped with thimble Channel, linear bearing is embedded at corner location, and outer end is equipped with notch and dynamic model fixing piece for installing moving template 523.Cover half component 53 include solid plate 531, cover half fixed plate 532 and injection head 533, solid plate fixed plate be square type plate, its Middle part is equipped with stepped hole, and cover half fixed plate is in the major diameter section of stepped hole, and injection head is in path section.Pushing tow component 54 Including thimble 541, guide post 542, push rod 543 and pedestal 544, push rod 543 is hydraulic push rod, and cylinder body is connected with pedestal, is living Chock plug is connected with dynamic mould fixing plate, and thimble extends in thimble channel, and guide post is connected after passing through linear bearing with cover half fixed plate, Cover half fixed plate and dynamic mould fixing plate surround mold core cavities, and mold core 51 is placed in mold core cavities, and mold core alveolus is corresponded in dynamic mould fixing plate Domain is equipped with heating sheet；Closing unit is connected to outside metering module, is connected to its injection head with measuring room.

It is carried out as follows when carrying out ultrasound plasticizing micro injection molding with this shaping machine main body:

1, start heating component, give plasticizing chamber heating, play the role of assisting ultrasonic plasticizing；

2, control changeover valve is in off state, and is fed 10g or so (plastic multiple periods) for the first time, is passed through rotating mechanism Motor convey about 1-2g every time, after, stop screw, screw slide drive rotating mechanism and charging pressure assembly into The displacement of row segment, while ultrasonic wave instruction is opened, Ultrasonic probe is started to work, and charging pressure assembly continues slowly to be displaced to protect Enough plasticizing pressures are held, polymer beads start to be plasticized；

3, after the completion of being plasticized, rotary valve and class ball valve are opened, polymer melt is under the pressure effect of pressure plunger through holding in the mouth The runner connect in block enters in the measuring room of metering module, and corresponds to runner position equipped with heating sheet to guarantee to gather under connecting block Polymer melt is in high temperature state；

4, when polymer melt enters measuring room, driving metering plunger retracts, and metering plunger carries out back pressure PID control plan Slightly, back pressure reaches setting value, obtains molded part polymer melt aequum according to PVT curve and displacement sensor, stops molten Body conveying, metering finish, and injection piston is matched with measuring room front end injection canal at this time, i.e. injection canal does not connect with measuring room Logical, melt is fully populated in measuring room；

5, the displacement of injection ram rollback segment is controlled by driving assembly, injection ram and the injection of measuring room front end are logical at this time Road is detached from hole axle cooperation, i.e., injection canal is connected to measuring room, and driving assembly control metering plunger anterior displacement finishes metering Melt extrusion to measuring room front end injection canal, last driving assembly control metering piston is by melt extrusion Into injection canal；

6, (original state die unit is in the mold core type chamber that polymer melt is fills up in moving template by injection head Molding state), injection piston is persistently displaced pressure maintaining, completes the filling pressure maintaining of polymer melt；It is controlled and is infused by driving assembly It penetrates piston to advance in metering plunger, polymer melt is pressed into closing unit；Polymer melt is in filling mold cavity mistake Cheng Zhong, injection ram continues for displacement pressure maintaining, when mold filling to certain proportion, is switched to pressure control, completes polymerization The filling pressure maintaining of object molten mass

7, electric pushrod drives dynamic mould fixing plate movement, and dynamic mould fixing plate carries out die sinking movement far from cover half fixed plate, and one After positioning moves, knock-pin ejects molded part, completes the ejection of parts with microstructure；

8, it repeats the above steps and carries out the movement in next period.

The present embodiment after coming into operation compared to traditional ultrasonic plasticizing forming equipment for, pass through charging pressure assembly Design realize ultrasound plasticizing automatic ration material feeding function, reduce manual feed time significantly and material requested estimated defeated It send, which can realize simple replacement critical component, meet equipment size and technological parameter seriation requirement, may be implemented to gather The accurate conveying of polymer melt, prevents melt backflow phenomena, conveys polymer melt, tool heads and plasticizing cavity wall face using plunger Abrasion reduce, measure injection technique again afterwards using first be plasticized, also can be used while be plasticized while measure injection technique again, Forming Quality It is higher；Each module linking is integrated, so that polymer beads quantitative feeding and polymer melt transportation integration, whole equipment Structure is simpler compact, and setting heating component plays the role of assisting ultrasonic, polymer beads plasticizing efficiency outside plasticizing chamber Faster；Using servo PID back pressure control strategy, polymer melt metering is more accurate, and waste of raw materials rate reduces；Injecting unit with Die unit perfection linking is compared with traditional injection moulding molding, avoids the waste of raw materials remained in fixed board channel；It can be achieved The continuous, accurate of micro-nano structure part, low consumption, high quality molding.

Claims (10)

1. a kind of ultrasound plasticizing Micro Injection Molding Machines main body, it is characterised in that: it includes quantitative feeding module, ultrasound plasticizing mould Block, metering module, injection module and closing unit；

Quantitative feeding module includes parallel moving mechanism, rotating mechanism, charging pressure assembly and barrel component, feeds the one of pressure assembly End extends in barrel component, the other end is connected with rotating mechanism, and rotating mechanism is connected on parallel moving mechanism；

Ultrasound plasticizing module includes plasticizing chamber, and plasticizing chamber is externally provided with heating component, and the entrance and quantitative feeding module for being plasticized chamber connect Logical, outlet is connected to metering module；

Metering module includes measuring room, metering plunger, displacement sensor, pressure sensor and driving mechanism, the both ends of measuring room It is opening, one end is connected to closing unit, and the axial centre for measuring plunger is equipped with through-hole, and it is another that metering plunger is set to measuring room One end end is connected with driving mechanism, displacement sensor be connected to metering plunger outside, pressure sensor be set to metering plunger with Between driving mechanism, measuring room is connected to the runner of connecting block；

Injection module includes injection piston, driving assembly, and one end of injection piston passes through metering plunger and extends in measuring room, injects The other end of plunger is connected with driving assembly.

2. ultrasound plasticizing Micro Injection Molding Machines main body as described in claim 1, it is characterised in that: the parallel moving mechanism is lead screw Slide unit；The rotating mechanism includes stepper motor and motor cabinet, and motor cabinet is the rectangle seat of top end opening, and the bottom end of motor cabinet is set There is through-hole, stepper motor is assemblied in motor cabinet, and the output shaft of stepper motor is connected after passing through through-hole with flexible coupling, is rotated Mechanism is assemblied in outside the slide unit with its motor cabinet；The charging pressure assembly include quantitative conveying lever, transiting rod, connecting shaft and Press plunger, and one end of quantitative conveying lever is connected by transiting rod with pressure plunger, the other end is connected with connecting shaft, charging pressure Component is connected with its connecting shaft with flexible coupling.

3. ultrasound plasticizing Micro Injection Molding Machines main body as claimed in claim 2, it is characterised in that: the quantitative conveying lever includes Bar main body, equidistant helical blade and stop collar, bar main body include major diameter section, conical section and path section, the outer end of major diameter section Equipped with threaded hole, the outer end of path section is equipped with thread head, and helical blade is axially disposed in outside path section, and stop collar is to be set to Soft ring flat-plate outside path section, at helical blade root position；The outer wall of the one end of the connecting shaft be equipped with screw thread, the one of connecting shaft End is connect with bar main body screw, and the other end is connected with flexible coupling；The pressure plunger is cylindrical type plug, and outer diameter was greater than The outer diameter of bar is crossed, top is equipped with threaded hole, and it is in annular groove arranged up and down to prevent melt adverse current that outer wall, which is equipped with a pair of,；It is described One end of transiting rod is equipped with threaded hole, and the other end is equipped with thread head, and screw thread nose end is connected with bar main body screw head, screw thread head end and Press plunger screw connection.

4. ultrasound plasticizing Micro Injection Molding Machines main body as claimed in claim 2, it is characterised in that: the barrel component includes material Cylinder, transitional cylinder and cartridge holder；The side wall of barrel is equipped with feed inlet, and feed inlet is externally connected with blanking component, blanking component packet Include hopper, feeding cylinder, feed screw and motor, the bottom end of hopper is connected to feeding cylinder, feeding cylinder be in tilted layout, its low side with into Material mouth connection, feed screw is axially disposed in feeding cylinder, and the output shaft of motor is connected with feed screw；The both ends of transitional cylinder It is equipped with the connection ring of evagination, connection ring is equipped with mounting hole；The bottom end of the barrel is equipped with the terminal pad of evagination, in terminal pad Equipped with connecting hole；Barrel cooperates corresponding nut to fasten by passing through the bolt of mounting hole, cartridge holder and connecting hole.

5. ultrasound plasticizing Micro Injection Molding Machines main body as claimed in claim 4, it is characterised in that: the quantitative feeding module is also Including linear bearing and linear bearing bracket；The internal diameter of linear bearing and the outer diameter of transiting rod match；Linear bearing bracket packet Positioning sleeve and mounting rod are included, a pair of of mounting rod is symmetrically fixed in the outer wall of positioning sleeve, and the outer end of mounting rod is equipped with through-hole；Linear axis It installs assigned in the bottom end that in positioning sleeve, linear bearing bracket is anchored on transitional cylinder by passing through the fastener of through-hole；The transition The screw thread head end of bar is connected after passing through linear bearing bracket with pressure plunger.

6. ultrasound plasticizing Micro Injection Molding Machines main body as claimed in claim 5, it is characterised in that: the ultrasound plasticizing module is also Including Ultrasonic probe, rotary valve, connecting block and class ball valve；Plasticizing chamber both ends be opening, bottom side wall be equipped with stream Through-hole sets runner in connecting block, and heating component and rotary valve are placed on outside plasticizing chamber, and rotary valve is located at recirculation hole, heating group Part is located at the top of rotary valve, and the valve rod of class ball valve extends in runner, and Ultrasonic probe is protruded into from bottom end is plasticized intracavitary, plasticizing chamber Bottom end be anchored under linear bearing bracket and be connected to transitional cylinder.

7. ultrasound plasticizing Micro Injection Molding Machines main body as claimed in claim 6, it is characterised in that: the plasticizing chamber includes taper Section and cylindrical section, the bigger diameter end of conical section is connected to transitional cylinder, miner diameter end and cylindrical section are linked together, and recirculation hole is located at cylindrical section Bottom；The heating component includes heat transfer jacket, heating sheet and insulating assembly, and heat transfer jacket is placed on outside cylindrical section, and heating sheet is affixed on biography On hot jacket, insulating assembly is coated on outside heat transfer jacket；The connecting block is square type block, and one end is equipped with the perforative rank of through-thickness Terraced through-hole, one end of the runner is connected to ladder hole, the other end extends to outside connecting block；The rotary valve is logical positioned at ladder In the major diameter section in hole, whether it is connected to for controlling plasticizing chamber with runner；The class ball valve is assemblied in outside connecting block, valve rod extends to stream In road.

8. ultrasound plasticizing Micro Injection Molding Machines main body as described in claim 1, it is characterised in that: the driving mechanism and driving Modular construction is identical, includes bracket, stepper motor, shaft coupling, screw rod and nut seat, bracket is door type frame, the side of bracket Embedded with bearing, stepper motor is assemblied in outside the other side of bracket, its main shaft extends in bracket and is connected by shaft coupling with screw rod, silk The other end of bar is assembled in bearing, and nut seat is threadedly connected to outside screw rod；The metering plunger and injection piston respectively with phase The nut seat answered is connected.

9. ultrasound plasticizing Micro Injection Molding Machines main body as described in claim 1, it is characterised in that: the closing unit includes mould Core, dynamic model component, cover half component and pushing tow component；Dynamic model component includes moving template and dynamic mould fixing plate, and moving template fixed plate is Square type plate, center position are equipped with thimble channel, and linear bearing is embedded at corner location, and outer end is equipped with for installing The notch and dynamic model fixing piece of moving template；Cover half component includes solid plate, cover half fixed plate and injection head, and solid plate fixed plate is Square type plate, its middle part are equipped with stepped hole, and cover half fixed plate is in the major diameter section of stepped hole, and injection head is in path section； Pushing tow component includes thimble, guide post and push rod, and thimble extends in thimble channel, and push rod is affixed with dynamic mould fixing plate, guide post It is connected after linear bearing with cover half fixed plate, cover half fixed plate and dynamic mould fixing plate surround mold core cavities, and mold core is placed in mold core It is intracavitary；Closing unit is connected to outside the metering module, is connected to its injection head with measuring room；It is corresponding in the dynamic mould fixing plate Mold core cavity region is equipped with heating sheet.

10. a kind of ultrasound plasticizing micro injection molding method, which is characterized in that this method utilizes ultrasound modeling described in claim 1 Change Micro Injection Molding Machines main body as tool progress, comprising the following steps:

Step 1: starting heating component, gives plasticizing chamber heating, assisting ultrasonic plasticizing；

Step 2: control plasticizing chamber is in close state, quantitative feeding, parallel moving mechanism after the completion of charging are realized in rotating mechanism work It works and opens ultrasonic wave instruction, charging pressure assembly continues slowly to be displaced to keep enough plasticizing pressures, polymer beads Start to be plasticized；

Step 3: opening plasticizing chamber, connecting block has been heated to the condition of high temperature to keep polymerizeing by heating sheet at this time after the completion of plasticizing The molten mass state of object, polymer melt enter metering module through connecting block runner under the pressure effect of pressure plunger；

Step 4: polymer melt enters measuring room, driving mechanism driving metering plunger retracts, when back pressure reaches setting value, root Molded part polymer melt aequum is obtained according to PVT curve and displacement sensor, stops melt conveying, metering finishes, at this time Injection piston is matched with measuring room front end injection canal, i.e. injection canal is not connected to measuring room, and melt is fully populated in metering In room；

Step 5: controlling the displacement of injection ram rollback segment by driving assembly, injection ram and measuring room front end are injected at this time Channel is detached from hole axle cooperation, i.e., injection canal is connected to measuring room, and driving assembly control metering plunger anterior displacement will measure Complete melt extrusion to measuring room front end injection canal, last driving assembly control metering piston squeezes polymer melt It is depressed into injection canal；

It is displaced in injection canal Step 6: driving assembly continues control injection ram, by polymer under certain speed Melt is injected in the type chamber in closing unit；

Step 7: polymer melt, during filling mold cavity, injection ram is first displaced with constant speed and is filled, to type chamber When being fills up to certain proportion, it is switched to pressure control, injection ram is switched to constant pressure injection at this time, completes polymer melt Fill pressure maintaining；

Step 8: it is cooling, it repeats the above steps after die sinking pickup and carries out the movement in next period.