Integral type heats up flow path technology

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In shedding line technology to be provided in plastic injection mould as heat wide application, the connection way that traditional runner plate and nozzle leave in pressure is progressively the system of hot flow path of the form of characters or letters that be rectified is replaced. In recent years, large and medium-sized note model when using needle type much nozzle to inject, also use the whorl connection of nozzle and runner plate. The system of hot flow path that one's early years has type of whole of path of integral type thermal current is made had before New Year more. Of one model much antrum small make use thimble type spray head, the span between axes of small spray head is 10 ～ 20mm when, nozzle uses whorl connection runner plate, cause construction of system of hot flow path compact. The graph shows the whorl connection that is the 4 nozzle that distributing point-blank 1 times, runner plate is rectangular cylinder. The much nozzle installation of connection of this kind of whorl is on the runner plate of minor volume. Long and thin nozzle has better flexible. Have below working status bend be out of shape, expand in order to compensate the transverse heat of runner plate. Nozzle relies on runner plate to conduct heat, do not install add hot coil. Due and enough strength mixes connection snail tooth relatively high accuracy, want to be able to disassemble. A glue between nozzle end panel and underside of runner plate Kong Zun, must reliable. The hot compensation of large size runner plate comes true very hard. Nozzle of diametical 10mm above, lack bends be out of shape the flexibility below, long-term since cannot use structure of type of this kind of whole. The demand that way of integral type thermal current expands in recent years, the consumptive electron product such as flat computer and sport plane, mobile phone is much, crop very big. If the graph shows the thin plate that note model 2 times, use the gating system of hot flow path and combination of cold flow path mostly. Graph 2 in nozzle of gules 4 hot flow path, will plastic fuse-element carries cold flow path of yellow, via infuse of rectangular side runner antrum. Nowadays, needle type nozzle is taller and taller than opening the applied scale of type nozzle, if plastic fuse-element is shot directly in the runner of needle type nozzle,note model the surface, on the labour tabulation face with runner trace laminose now protruding. Runner is on the hot protective screen between nozzle of hot flow path and calm model antrum, temperature change is big. Plastic fuse-element charges a pattern cut rate tall, flow is not steady, note model on area classics regular meeting has the drawback such as mark of going from place to place near runner. Nowadays, the drive of needle type nozzle enrages the time sequence control of crock or oil cylinder, the position that fusion seams can be adjusted in process trying a model. The inject dot of the much nozzle that integral type thermal current is go up in cold flow path, the demand of positional dimension precision that nods to deciding the inject on pattern plate is not high, suit the application that integral type thermal current. The graph of hot flow path that pressure assembles is shown 3 times for nozzle of pneumatic needle type, runner plate 11 with nozzle body it is 14 to lean both the pressure connection between. ※ pursues 3 on the connection face that B face is runner plate and nozzle to fall in pressure. The mutual interference that it is expanded by the heat of 2 direction, namely the heat with transverse runner plate expands and the heat of nozzle axes direction expands, machine and be assembled the influence of the error again, regular meeting of the classics on B face produces the leak of frit glue. ※ pursues 3 on A face is nozzle protruding shoulder and decide the Kong Zun on pattern plate bear control an aspect. Going up of the calm pattern plate of numerous nozzle, must go up in same plane by Kong Zun each. They are apart from the underside B of runner plate, be apart from fixed die the C face of fixed head, must have taller dimension noncombatant duty. A face is heat of nozzle axes direction expands quantity calculative datum plane. Shoulder of protruding of axes direction nozzle, runner plate and bear press a production error of 9, can affect runner plate 11 with nozzle body 14 both the pressure between. When pressure inadequacy, or pressure of many nozzle axial has difference, can make frit glue causes the leak in B face. On the other hand, in face of A of nozzle protruding shoulder, quantity of heat conducts calm pattern plate to go up directly, loss heats up the energy of flow path. ※ pursues 3 on C face is bear control a group 9 and fixed die fixed head the 2 assembly between face. Should stay between them have 0.

03 ～ 0.

The clearance of 05mm is measured. Otherwise on nozzle axes of each spare parts expand, meeting pressing breaks through the hot pressing stress that produces fixed die fixed head. Pressure of many nozzle axial has difference, meet those who cause runner plate bend be out of shape, also can cause the leak of glue of the frit on B face. If countervail of vulcanize of path of integral type thermal current pursues 4 show needle type spray head, needle of awl head a powerful person uses drive of oil cylinder piston. 3 installation are in drive oil cylinder on runner plate. Nozzle housing 18 go up the shoulder that do not have protruding, only runner is covered 21 fixed go up in calm pattern plate. The heat that nozzle axes direction produces expands, do not suffer fixed die the tie of fixed head, without the counterpressure to nozzle. Nevertheless, the oil cylinder that reposes on runner plate needs titanium alloy heat insulation, use boiler circulation refrigeration. But, the transverse heat of runner plate expands, sell 20 outward heat from central fixed position outspread, if pursue,5 are shown. What Nextpage needs computation to forecast runner plate is transverse expand quantity. See a picture 5 on, the dimension that exports the position in the flow path on the runner plate below room temperature is Lp, the flow path on the runner plate below working temperature exports positional dimension to be Lq, the Lp in having type, the flow path on the runner plate below room temperature exports positional dimension, mm; Li, the positional measure that inject of the nozzle below room temperature orders, mm; Lq, the dimension of position of export of the flow path on the runner plate below working temperature, mm; Tm, the temperature of the mould, ℃ ; Tr, room temperature, 20 ℃ ; Tf, the inject temperature that plastic frit expects. If pursue 4 shown hot runner plate are full-length 740mm, wide 174mm. Farthermost inject dot is apart from central 376mm, design the Li=376mm on blueprint. Runner plate uses 4Cr13 steel, have AFe=11.

℃ of 5 × 10-6/ . Calm pattern plate uses P20(beautiful) , have AFe=12.

℃ of 8 × 10-6/ . Temperature Tf=240 ℃ , tm=45 ℃ , tr=20 ℃ . Beg the positional dimension Lp that the flow path on the runner plate below room temperature exports. In high temperature working status falls, axes of the nozzle on runner plate should the nozzle axes coincide with calm pattern plate, type (1) and type (2) is equal, lq = Lq. After getting leaving type, computational room temperature issues axes of mouth of the inject on runner plate, in the center of distance mould Lp. Computation has when the treatment below room temperature decides pattern plate, nozzle axes is apart from a model to be apart from central distance to should be Li=376mm. And runner plate is machined below room temperature, axes of exit of the inject on runner plate is apart from a mould central distance Lp=375.

17mm. Coincide of these two axes when shaping is shot in high temperature chip in, lq=376.

12mm. The transverse position measure that the nozzle on runner plate installs, the biggest expand the quantity has 0.

95mm. Below working temperature, nozzle runner covers solid outfit to be on the calm pattern plate of 45 ℃ , the whorl connection of nozzle paragraph have temperature of 240 ℃ job. The inject of the runner plate below room temperature nods classics vulcanize countervail, in inject working temperature falls, axes of the flow path on runner plate can the nozzle axes coincide with calm pattern plate. The wall of the intensity of nozzle of path of integral type thermal current and flexibility nozzle housing is large get the periodic action of frit glue pressure, put in the fatigue intensity problem of craze, get the nozzle of internal pressure action, have the restriction with the least large wall. Approach many spray head into the runner aperture that decides pattern plate below room temperature, in the process that warms up in system of hot flow path, the nozzle of whorl connection still meets those who produce axes way bend be out of shape, if pursue,6 are shown. Runner plate ends from which initiative, transverse heat expands be out of shape △ L, and the runner Duan Gu of nozzle is surely in calm pattern plate, runner paragraph fixed and sectional on have the biggest curve stress action. There is add turn quadrature to fall in nozzle and connection of runner plate whorl, need has bigger wall thick, just have intensity security. The heat that the transverse heat of runner plate expands is stretchy, increase all the more as dimension parameter serious. The external diameter of nozzle of big flow path is bulkier, tigidity is good but axial flexibility is poor. Bend to realize nozzle to already intensity wants to have again flexible, if the graph is shown 4 times, in nozzle whorl connection paragraph outside, cut dig week to groove, raise axes way curve flexibility. This groove is sectional comprise by circular arc and cant, prevent stress concentration, position opening slot is not danger in nozzle housing sectional, the least wall of nozzle cylindrical shell is large still should have enough strength. To facilitate integral type heats up the installation of flow path, shed heat path and nozzle to heat to 120 ℃ , insert in installing calm pattern plate. If the whorl connection that integral type thermal current pursues 4 show needle type spray head, the whorl M20 × of nozzle head 1, have 6 horn head and tighten. 6 horn have enough space between head end panel and runner plate, let seal glue end panel to have enough thrust, have the measure that avoids whorl connection to become loose even. Due and enough strength mixes connection snail tooth relatively high accuracy, want to be able to disassemble. Snail tooth surface changes processing through nitrogen. Introduction of line of thermal current of large whole type sees a picture radiator of 7 inject car is decorated gating system. ABS is decorated have 45 grams, long make an appointment with 700mm, mural thick 3mm, share 5 inject to nod. Upper reaches is system of hot flow path, nozzle of 5 needle type uses time order implement control leaves shut. The runner of nozzle is the straight runner below needle of awl head a powerful person, cold flow path begins from straight runner, frit makings carries conceal type runner to note model to decorate by flow path. Time sequence control implement string accept the sequence control system that fixing model machine in, after be being sparked by the signal of injection process, can adjust the open of nozzle of 5 needle type and the time that shut. When machining spot test-fire, settling time sequence control implement on each nozzle opens the time setting that shut. The frit makings that central nozzle injects is advanced to come when position of runner of adjacent of or so photograph, ability open the needle of a powerful person of these two nozzle, can eliminate the fusion on adornment length direction to seam. If the graph is shown 8 times, the needle type nozzle that integral type thermal current by oil cylinder drive, input the oil pressure 3MPa of pressure oil, action is on the piston of 35mm diameter, valid area is 735mm2, can produce closing force to have 2205N. 5mm of diameter of needle of a powerful person, needle of a powerful person is in when closing can elbow 112.

The high-pressured frit of 3MPa(1150kgf/cm2) expects. Oil cylinder body circulates with cooling water frigorific, 2 receive 2 return, string together all the way receive 3 oil cylinder, string together additionally all the way receive 2 oil cylinder. Oil cylinder body maintains in 40 ～ 45 ℃ temperature, make sure the sealing ring on oil cylinder works normally, still use the titanium alloy with thick 15mm bear control a group, cut off the caloric on runner plate is conducted. Inside casing of calm pattern plate heat lead, measure line of tepid couple down-lead, vitta and water-cooling cop to lap have adiabatic coat layer, have reliable clip firm. Nozzle grows 206mm, external diameter 24mm, housing wall is large 6.

5mm, the small port diameter of nozzle front straight runner 2.

5mm. The external diameter 12mm that runner covers, cooperate length 14mm, press fixed die Kong Zhong, have enough strength, can get cooling effectively again. The advantage whole type that integral type thermal current heats up flow path system to have the advantage of 5 respects, be sure to make structure of a kind of commonly used hot flow path. 1.

Compare pressure connection, nozzle and connection of runner plate whorl reduced the possibility of frit glue leak of 50% . 2.

The protruding shoulder that nozzle cancelled big diameter paragraph, the problem of consistency of axial fixed position in deciding pattern plate Kong Zun without shoulder of many nozzle protruding. The machining error that avoided to decide pattern plate is right the influence that installs precision. 3.

Avoid nozzle protruding shoulder to be conducted to deciding the heat of pattern plate Kong Zun, make decide a model the refrigeration of antrum board is more effective, the temperature of system of hot flow path distributings tend reasonable. 4.

The cutting treatment of the nozzle housing of straight barrel type is convenient, the province is versed in the province expects. 5.

System of road of integral type thermal current is injecting to install and be adjusted of the mould, forthright of hotter than pressure connection type flow path is gotten much. CNC Milling CNC Machining