CN1752984A - Determination method of plastic injection technological parameter and injection moulding machine - Google Patents

Abstract

The present invention relates to a method for setting plastic injection process parameter. Said method includes the following steps: using lots of injection examples as basis and creating example data base, according to plastic injection condition of objective example utilizing example inference method to search the example most approximate to objective example in the example data base so as to obtain the approximate plastic injection process parameter, and utilizing the example to absorb and modify said process parameter so as to define the process parameter of objective example. Said invention also provides an injection moulding machine including injection moulding main machine, memory, process paramete processor and controller.

Description

Determination method of plastic injection technological parameter and injection machine

Technical field

The present invention relates to the injection-moulding plastic field, particularly a kind of determination method of plastic injection technological parameter specifically by collecting, put in order the production instance in the plastics injection production, is determined the technological parameter of plastics injection based on the method for case-based reasoning.

Background technology

Characteristics such as plastics have that density is little, in light weight, good insulation preformance, dielectric loss is low, chemical stability is high and wearing quality is good, be widely used in every field such as industry, agricultural, building, packing, national defence and daily life, its rate of growth has leapt to first of the four big industrial materials (plastics, iron and steel, timber and cement), be one of fastest-rising industry in the world, the consumption that calculates according to volume and weight in the whole world has surpassed steel.

The injection moulding of plastics have the production cycle fast, production efficiency is high, can forming shape complexity, size accurately or the goods of band inserts and characteristics such as easily be automated, therefore, injection moulding becomes one of main machining method of plastics, plastics with the method processing have accounted for 32% of plastic processing general assembly (TW), occupy important status in the plastic products production industry.

Injection molding technological parameter is extremely important in plastics-production, directly has influence on product quality, cost and production cycle.And but determining of Shooting Technique parameter is very complicated, and factors such as itself and injection machine, plastics performance, mould are closely related.Traditional Shooting Technique determination method for parameter mainly is hit-and-miss method (claiming trial and error again), promptly determines constantly to carry out evaluating after the die trial behind the technological parameter according to the limited experience of related personnel, finally determines suitable Shooting Technique parameter.But in actual production, because the performance of plastic material varies, the structure of goods and mould is ever-changing, and the technological parameter complexity of injection machine is various, only is difficult to these factors are done comprehensively to consider and handle with limited experience; And the accumulation of related personnel's experience can't be caught up with the development of plastic material and the raising of goods complexity and accuracy requirement, therefore this method die trial repeatedly, thus cause technological parameter to determine that the time is long, the production gap is big, the moulding cycle period is long, rejection rate is high, product quality is undesirable, production is unstable, the injector utilization factor is low.Simultaneously, the essential experienced related personnel of this definite method, and because these type of personnel's wretched insufficiency has restricted the development of plastics injection industry.

Along with global market competition is growing more intense, requires to reduce as far as possible moulding process and the time is set, shortens the plastic product production cycle, improves quality of item, impels the maximization of injector productive capacity.Therefore, be badly in need of determining fast and accurately the technological parameter of plastics injection, replace traditional " trial and error " with new Shooting Technique parameter determination method.

Summary of the invention

Technical matters to be solved by this invention is to overcome the above-mentioned defective of prior art and determination method of plastic injection technological parameter and injection machine are provided, to reach the correct fast purpose of determining plastic injection technological parameter.

The present invention solves the problems of the technologies described above the technical scheme that is adopted:

A kind of determination method of plastic injection technological parameter, with a large amount of injection moulding examples is that instance database is set up on the basis, plastics injecting condition according to object instance, utilize the method for case-based reasoning, the search example the most close in instance database with object instance, obtain close plastic injection technological parameter, and draw and revise the technological parameter of this close example, thereby determine the technological parameter of object instance by example.

People are in order to solve a new problem, generally always naturally find an old problem similar to new problem earlier from memory, again in the old problem for information about with knowledge use in the finding the solution of new problem, just based on the inference method of example.Equally, in injection moulding was produced, therefore each production instance knowhow of technologist that all condensed itself, can carry out reasoning by the production instance of arrangement, determines rational Shooting Technique parameter, and it is of the present invention according to the place that Here it is.

Specifically, plastic injection technological parameter of the present invention is determined method, and its overall flow block diagram as shown in Figure 1.At first import the CAD moulding file (stl file) of goods, and the input injection plastics trade mark and injection machine model.Position according to cast gate is provided with calculates the die cavity geometric data by this cad file, comprises length of flow, average thickness, die cavity complexity, mold cavity volume etc.In case library, search for the example (similar example) the highest according to die cavity geometric properties, plastics rerum natura with current injection process similarity, and each technological parameter of taking-up example, technological parameter to similar example is revised, and by the controller of plastic injection molding communication interface each technological parameter is uploaded in the controller of plastic injection molding then.Carry out die trial again, if die trial success then will current injection moulding process be kept in the case library on the computer memory as production instance, make that case library is constantly abundant, expansion, as the basis of later case-based reasoning.

Example in the above-mentioned case library is described by the structure of its plastics injecting condition and corresponding technological parameter.This is because inevitable internal relation is arranged between the technological parameter of example injecting condition and injection moulding, just can determine the required technological parameter of injection moulding production by the injecting condition of example.

The plastics injecting condition of above-mentioned example following three aspects of serving as reasons are described: plastics kind, mold cavity geometric properties, injection machine model, wherein, described mold cavity geometric properties comprises: length of flow, average thickness, die cavity complexity, mold cavity volume.This is because Shooting Technique parameter and this several factors are closely related, different plastics have different rheological properties, the mold cavity feature also has decisive influence to technological parameter, and the coefficient that the injection machine of different model is changed (theoretical parameter) from technological parameter machine value (machine parameter) to true technological parameter is different.

The technological parameter of above-mentioned example comprises following aspect: injection parameters, pressurize parameter, cooling parameter and plasticizing parameter, nozzle heating-up temperature, nozzle holding temperature etc.This is because in the plastics injection process, and these parameters have the greatest impact to the moulding quality, are topmost technological parameters, and also being that the technologist is the most difficult in the mode transfer process determines, needs most definite technological parameter.

The organizational form of instance data sees table 1 for details thus.

Table 1, instance database organizational form

Example aspects	Plastics kind
			The injection machine model
	The die cavity length of flow
			The goods average wall thickness
	Mold cavity volume
			Die cavity complexity (interval [0.0,1.0])
	Technological parameter	The barrel heating-up temperature
The barrel holding temperature
		Injection parameters	Inject time
Injection pressure
	Injection speed
The injection start position
	The injection final position
The pressurize parameter			Dwell time
	Dwell pressure
		Cooling parameter	Cool time
The plasticizing parameter	Screw speed (angular velocity)
		Bedding and padding length
	Plasticizing terminal point (pine is not given up the throne and moves after not containing)
		Back pine is given up the throne and moves
	Back pressure

Above-mentioned case library leaves on the computer memory, can call so at any time.

As object instance, can determine moulding, plastics kind and the injection machine model of injection-molded item.According to the moulding file of injection-molded item, calculate required die cavity geometric properties data, i.e. length of flow, average thickness, mold cavity volume, and rule of thumb determine the die cavity complexity.

Determine the similarity of each example in current goal example and the case library then.Similarity adopts following formula to calculate:

$s=\frac{f\left(0\right)\×\underset{i=1}{\overset{4}{\mathrm{\Σ}}}(W_i\×f\left(i\right))}{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}{W}_i}---\left(1\right)$

Wherein, f (i) is the factor of influence of each characteristic, comprises the material factor, the thickness factor, the length of flow factor, the mold cavity volume factor and die cavity complexity factors etc., W _iWeights for each factor of influence: each factor of influence adopts following various calculating:

Material factor f (0):

Wherein, the material factor is the similarity of plastic material, comprise the similarity of viscosity, the similarity of shrinkage factor and the similarity of thermal diffusion coefficient, (i) (i=1,2,3) is respectively the mobile similarity factor, the pressurize similarity factor and the cooling similarity factor of material

v _i(i=1,2,3) is respectively the weights of each factor; η _(obj), η _(src)Be respectively the viscosity of object instance and similar example plastic material, can adopt the Cross Viscosity Model to calculate: $\mathrm{\η}=\frac{{\mathrm{\η}}_0(T,P)}{1+{({\mathrm{\η}}_0\mathrm{\γ}/{\mathrm{\τ}}^{*})}^{1-n}},$ ${\mathrm{\η}}_0(T,P)={\mathrm{Be}}^{T_b/T}{e}^{\mathrm{\βP}},$ τ ` is a material constant, and n is a non-newtonian index, η ₀Be zero-shear viscosity, B, T _b, β is material constant; s _(obj), s _(src)Be respectively the shrinkage factor of object instance and similar example materials; α _(obj), α _(src)Be respectively the thermal diffusion coefficient of object instance and similar example materials, the physical parameter of above-mentioned material reads from the plastic material storehouse.

Thickness factor f (1): $f\left(1\right)=1-\frac{|{\mathrm{thick}}_{\left(\mathrm{obj}\right)}-{\mathrm{thick}}_{\left(\mathrm{src}\right)}|}{{\mathrm{thick}}_{\left(\mathrm{obj}\right)}}---\left(3\right)$

Length of flow factor f (2): $f\left(2\right)=1-\frac{|{\mathrm{fiowLen}}_{\left(\mathrm{obj}\right)}-{\mathrm{fiowLen}}_{\left(\mathrm{src}\right)}|}{{\mathrm{fiowLen}}_{\left(\mathrm{obj}\right)}}---\left(4\right)$

Mold cavity volume factor f (3): $f\left(3\right)=1-\frac{|{\mathrm{volume}}_{\left(\mathrm{obj}\right)}-{\mathrm{volume}}_{\left(\mathrm{src}\right)}|}{{\mathrm{volume}}_{\left(\mathrm{obj}\right)}}---\left(5\right)$

Die cavity complexity factors f (4): $f\left(4\right)=1-\frac{|c_{\left(\mathrm{obj}\right)}-c_{\left(\mathrm{src}\right)}|}{c_{\left(\mathrm{obj}\right)}}---\left(6\right)$

Wherein, thick _(obj), flowlen _(obj), volume _(obj), c _(obj)Be respectively average thickness, length of flow, mold cavity volume, the die cavity complexity of object instance, thick _(src), flowle _(src), volume _(src), c _(src)Be respectively each characteristic of similar example correspondence.

Case retrieval: obtain the example of conditional value up to specification according to the similarity value, and from case library, determine the example the most similar with object instance.The similarity value is big more, the effect that technological parameter is determined is good more, and the similarity value is low more, and the effect that technological parameter is determined is poor more, therefore, the similarity of similar example must satisfy certain size, and general value 0.85 is only reasonably, a part of technological parameter of the similar example in the database can be used as the technological parameter of object instance at this moment, otherwise, be exactly irrational, the technological parameter in the database all can not be as the technological parameter of object instance.

After determining similar example, take out corresponding technological parameter from example.Because the technological parameter size of preserving in the example is the machine parameter numerical value (abbreviation machine parameter) that is provided with on the controller of plastic injection molding panel, wherein each kind of pressure, speed is the pressure in the hydraulic circuit just, the speed percentage value, rather than the true pressure of screw front end and velocity amplitude (being called theoretical parameter), that is to say, the part technological parameter is directly actuated by machine parameter, part is by machine parameter control indirectly, for directly actuated technological parameter, the machine value of setting is theoretical value, irrelevant with the injection machine model, technological parameter for indirect control, have transformational relation between machine value of setting and the theoretical value, the injection machine of different model has different conversion coefficients.Therefore, needs are considered the different of injection machine model that similar example and object instance use when determining that according to similar example pressure in the object instance is with the speed parameter value.

Had by the directly actuated technological parameter of machine parameter: barrel heating-up temperature, barrel holding temperature, dwell time, inject time, cool time, bedding and padding length, back pine are given up the throne and move etc., by machine parameter indirectly the technological parameter of control have: injection pressure, injection speed, dwell pressure, back pressure, screw rod rotational speed etc.

For the technological parameter of indirect control, need convert machine parameter to theoretical parameter, so that the using of object instance technological parameter.Each technological parameter conversion formula of controlling indirectly is as follows respectively:

Injection pressure: $p_{\mathrm{inj}\left(\mathrm{src}\right)}=p_{\max \left(\mathrm{src}\right)}\×\frac{p_{\mathrm{inj}-\mathrm{oil}\left(\mathrm{src}\right)}}{P_{\mathrm{panel}\left(\mathrm{src}\right)}^{\max }}$ Or

Injection speed: $v_{\mathrm{inj}\left(\mathrm{src}\right)}=\frac{v_{\max \left(\mathrm{src}\right)}}{0.25\mathrm{\π}{D_{\left(\mathrm{src}\right)}}^2}\×\frac{v_{\mathrm{inj}-\mathrm{oil}\left(\mathrm{src}\right)}}{v_{\mathrm{panel}\left(\mathrm{src}\right)}^{\max }}---\left(8\right)$

Dwell pressure: $p_{\mathrm{hld}\left(\mathrm{src}\right)}=p_{\max \left(\mathrm{src}\right)}\×\frac{p_{\mathrm{hld}-\mathrm{oil}\left(\mathrm{src}\right)}}{p_{\mathrm{panel}\left(\mathrm{src}\right)}^{\max }}$ Or

Back pressure: $p_{\mathrm{back}\left(\mathrm{src}\right)}=p_{\max \left(\mathrm{src}\right)}\×\frac{p_{\mathrm{back}-\mathrm{oil}\left(\mathrm{src}\right)}}{P_{\mathrm{panel}\left(\mathrm{src}\right)}^{\max }}$ Or

Screw rod rotational line speed: $v_{\mathrm{screw}\left(\mathrm{src}\right)}={\mathrm{\ω}}_{\mathrm{src}}\×\frac{D_{\left(\mathrm{src}\right)}}{2}---\left(11\right)$

Wherein, p _{Inj (src)}, v _{Inj (src)}, p _{Hld (src)}, p _{Back (src)}Injection pressure, dwell pressure, back pressure on the difference representation theory, p _{Inj-oil (src)}, p _{Hld-oil (src)}, p _{Back-oil (src)}The machine parameter values of representing injection pressure, dwell pressure, back pressure respectively, that is the force value in the oil circuit; p _{Max (src)}Be the maximum injection pressure of injection machine, p _{Panel (src)} ^Max, v _{Panel (src)} ^MaxBe respectively oil circuit maximum pressure, the velocity amplitude that can be provided with on the controller of plastic injection molding panel, A _{Injection cylinder (src)}Be the total sectional area of injection cylinder, A _{Screw (src)}Be screw rod sectional area, D _(src)Be screw diameter, v _{Screw (src)}Be screw rod rotational line speed, more than each variable be employed machine correspondence in the similar example value (the subscript unification is: _(src)).

Instance parameter is drawn: after searching the most similar example, from then on determine the technological parameter of object instance in the example.The principle that parameter is drawn is: the barrel heating-up temperature of object instance, barrel holding temperature, injection speed, injection pressure, dwell pressure, dwell time, cool time, bedding and padding length, back pine are given up the throne and move, the numerical value value of corresponding parameter in the similar example of screw rod rotational line speed reference.Wherein, by the directly actuated part technological parameter of machine parameter: heating-up temperature, holding temperature, dwell time, cool time, bedding and padding length, back pine are given up the throne and move the respective value of directly getting in the similar example, by the indirect technological parameter of control of machine parameter: injection speed, injection pressure, dwell pressure, the screw rod rotational line speed theoretical value after the above-mentioned formula conversion of learning from else's experience, other NM technological parameters are determined by revising in follow-up technological parameter correction.The available following formula of the absorption of parameter is clearly expressed:

T _(obj)＝T _(src)；T _(obj)′＝T _(src)′；t _hld(obj)＝t _hld(src)；t _cool(obj)＝t _cool(src)；ΔL _spare(obj)＝ΔL _spare(src)；Δx _(obj)＝Δx _(src)；p _inj(obj)＝p _inj(src)；v _inj(obj)＝v _inj(src)；p _hld(obj)＝p _hld(src)；p _back(obj)＝p _back(src)；v _screw(obj)＝v _screw(src)； (12)

Wherein, T _(obj), T _(obj)', t _{Hld (obj)}, t _{Cool (obj)}, Δ L _{Spare (obj)}, Δ x _(obj), p _{Inj (obj)}, v _{Inj (obj)}, p _{Hld (obj)}, p _{Back (obj)}, v _{Screw (obj)}Barrel heating-up temperature, holding temperature, dwell time, cool time, bedding and padding length, the back pine that is respectively object instance given up the throne and moves theoretical value with injection pressure, injection speed, dwell pressure, back pressure, screw speed (linear velocity), T (src)), T _(src)', t _{Hld (src)}, t _{Cool (src)}, L _{Spare (src)}, Δ x _(src), p _{Inj (src)}, v _{Inj (src)}, p _{Hld (src)}, p _{Back (src)}, v _{Screw (src)}Be respectively corresponding technological parameters theoretical value in the similar example.

Example correction: determine undetermined technological parameter in the parameter absorption, comprise inject time, injection start position, injection final position, plasticizing final position.Utilize the difference between object instance and the similar example volume injected, the method for correction is as follows:

Inject time: $t_{\mathrm{inj}\left(\mathrm{obj}\right)}=\frac{V_{\left(\mathrm{obj}\right)}}{v_{\mathrm{inj}\left(\mathrm{obj}\right)}}---\left(13\right)$

The plasticizing final position: $Y_{\left(\mathrm{obj}\right)}=\mathrm{\Δ}{L}_{\mathrm{spare}\left(\mathrm{src}\right)}+\frac{V_{\left(\mathrm{obj}\right)}}{0.25\mathrm{\π}{D_{\left(\mathrm{obj}\right)}}^2}---\left(14\right)$

The injection start position: $x_{0\left(\mathrm{obj}\right)}=\mathrm{\Δ}{L}_{\mathrm{spare}\left(\mathrm{src}\right)}+\frac{V_{\left(\mathrm{obj}\right)}}{0.25\mathrm{\π}{D_{\left(\mathrm{obj}\right)}}^2}+\mathrm{\Δ}{x}_{\left(\mathrm{src}\right)}---\left(15\right)$

The injection final position: $x_{1\left(\mathrm{obj}\right)}=x_{0\left(\mathrm{obj}\right)}-0.95\frac{V_{\left(\mathrm{obj}\right)}}{0.25\mathrm{\π}{D_{\left(\mathrm{obj}\right)}}^2}---\left(16\right)$

Wherein, V _(obj), t _{Inj (obj)}, Y _(obj), x _{0 (obj)}, x _{1 (obj)}Be respectively object instance volume injected, inject time, plasticizing final position, injection start position, injection final position.Other variable symbols definition are with aforementioned same.

Object instance technology conversion: the following theoretical value that will obtain again converts machine parameter values on the employed injection machine of object instance, i.e. the value that is provided with on the controller panel, and the formula of conversion is as follows:

Injection pressure: $p_{\mathrm{inj}-\mathrm{oil}\left(\mathrm{obj}\right)}=p_{\mathrm{panel}\left(\mathrm{obj}\right)}^{\max }\×\frac{p_{\mathrm{inj}\left(\mathrm{obj}\right)}}{p_{\max \left(\mathrm{onj}\right)}}$ Or

Injection speed: $v_{\mathrm{inj}-\mathrm{oil}\left(\mathrm{obj}\right)}=\frac{0.25{D_{\left(\mathrm{obj}\right)}}^2{v}_{\mathrm{panel}\left(\mathrm{onj}\right)}^{\max }}{v_{\max \left(\mathrm{obj}\right)}{v}_{\mathrm{inj}\left(\mathrm{obj}\right)}}---\left(18\right)$

Dwell pressure: $p_{\mathrm{hld}-\mathrm{oil}\left(\mathrm{obj}\right)}=p_{\mathrm{panel}\left(\mathrm{obj}\right)}^{\mathrm{mac}}\×\frac{p_{\mathrm{hld}\left(\mathrm{obj}\right)}}{p_{\max \left(\mathrm{obj}\right)}}$ Or

Back pressure: $p_{\mathrm{back}-\mathrm{oil}\left(\mathrm{obj}\right)}=P_{\mathrm{panel}\left(\mathrm{obj}\right)}^{\max }\×\frac{p_{\mathrm{back}\left(\mathrm{obj}\right)}}{p_{\max \left(\mathrm{obj}\right)}}$ Or

Screw speed: ${\mathrm{\ω}}_{\left(\mathrm{obj}\right)}=\frac{2\×v_{\mathrm{screw}\left(\mathrm{obj}\right)}}{D_{\left(\mathrm{obj}\right)}}---\left(21\right)$

Wherein, the implication of each corresponding variable is identical in the implication of each variable and the aforementioned formula, and each variable is the value of employed injection machine correspondence in the object instance.

Finally like this determined the above-mentioned processing parameter of object instance on the controller of plastic injection molding panel, the standard TCP/IP communication interface by controller of plastic injection molding uploads to technological parameter in the controller then, in order to carry out injection moulding.

If moulding quality zero defect then is saved in object instance in the case library after the above-mentioned object instance injection moulding, enrich the content of case library, as the basis of later case-based reasoning.

The present invention also provides a kind of injection machine, it comprises injection machine main frame, memory, technological parameter processor and controller, described memory stores case library, plastics rerum natura storehouse and injection moulding hangar, described technological parameter processor is determined technological parameter by said method, and technological parameter is transferred to controller.

Compared with prior art, the invention has the advantages that: use the case-based reasoning method, can obtain the technological parameter of the plastics injection under the specific injecting condition quickly and accurately, thereby shorten the plastic product production cycle, improve quality of item, impel the maximization of injector productive capacity.

Description of drawings

Fig. 1 is that plastic injection technological parameter is determined the method flow entire block diagram

Embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

As shown in Figure 1, set up three databases earlier: case library, plastics storehouse, injection moulding hangar, as the basis of this method.

Plastics injection production instance is collected, put in order to case library according to institutional framework as shown in table 1, is kept on the computer memory.

The physical parameters such as viscosity, shrinkage factor, thermal diffusion coefficient of different trade mark plastics are included in the plastics storehouse, leave on the computer memory basis that the material similarity was calculated during similarity was calculated as an example in.

The injection moulding hangar leaves the injection machine performance parameter arrangement of using in the injection example in the database in, is kept on the computer memory, as the basis that similar case process Parameters Transformation is become the object instance technological parameter.

Moulding CAD moulding file according to the target example calculates the die cavity geometric properties again: moulding CAD moulding file is a stl file, determine moulding average wall thickness (average wall thickness of die cavity just), volume injected, determine the complexity of die cavity and the position that is provided with according to cast gate according to technologist's experience, determine the length of flow in the die cavity, thereby determine the characteristic of object instance.

Case retrieval then: each example in the traversal case library, ask the example in the case library and the similarity size of object instance, find out the similar example the most similar with object instance.Calculation of similarity degree adopts formula (1) to carry out, it reads earlier the plastic material physical parameter that uses in object instance material property parameter and the similar example from the plastic material storehouse, calculate material similarity f (0), utilize formula (2)-(5) calculated thickness factor, the long factor of stream, volume factor, complexity factors more respectively, use formula (1) to calculate total similarity again.

Instance parameter is drawn then: determine the most similar example by the similarity value, from case library, take out the technological parameter of similar example, and from the injection machine database, read the injection machine performance data that example uses, utilize formula (7)-(11) that the technological parameter (machine parameter) of similar example is converted to theoretical parameter.One group of equation shown in the through type (12) is determined the theoretical value of the part technological parameter of object instance.

Carry out the example correction: through type (13) (14) (15) (16) is determined inject time, plasticizing final position, injection start position and the injection final position of object instance.

Object instance technological parameter conversion: from the injection machine database, read the performance parameter of the employed injection machine of object instance again, utilize formula (17)-(21) that the theoretical value of the object instance technological parameter determined is converted to the value of setting on the controller of plastic injection molding panel.Thereby, just finished whole computation process, determined technological parameter at the employed injection machine of object instance.

Again above-mentioned technological parameter is uploaded in the controller by the standard TCP/IP network communication interface that controller of plastic injection molding provides.

Injection machine carries out die trial, if the goods that obtain meet the requirements, then die trial success is saved in the feature and the technological parameter of this injection among the example stock.

Claims (8)

1. determination method of plastic injection technological parameter, it is characterized in that: with a large amount of injection moulding examples is that instance database is set up on the basis, plastics injecting condition according to object instance, utilize the method for case-based reasoning, the search example the most close in instance database with object instance, obtain close plastic injection technological parameter, and draw and the technological parameter of this close example of example correction by example, thus the technological parameter of definite object instance.

2. by the described determination method of plastic injection technological parameter of claim 1, it is characterized in that:

The injection moulding example of described instance database comprises two parts, and a part is an example aspects, and another part is a technological parameter; Described example aspects is described by following three aspects: plastics kind, mold cavity geometric properties, injection machine model, and wherein, the mold cavity geometric properties comprises: length of flow, average thickness, die cavity complexity, mold cavity volume; Described technological parameter is barrel heating-up temperature, barrel holding temperature, injection parameters, pressurize parameter, cooling parameter and plasticizing parameter;

The plastics injecting condition of described object instance is an example aspects, and it is definite: the CAD moulding file that imports the object instance goods by following method, position according to the cast gate setting, calculate the die cavity geometric data by this moulding cad file, comprise length of flow, average thickness, mold cavity volume, rule of thumb determine the die cavity complexity;

The most close described example with object instance is meant that similarity is the example more than or equal to setting, and similarity is by formula $s=\frac{f\left(0\right)\×\underset{i=1}{\overset{4}{\mathrm{\Σ}}}(W_i\×f\left(i\right))}{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}{W}_i}$ Calculate, the similarity data of plastics are by obtaining in the plastics rerum natura storehouse;

Described example is drawn: by the directly actuated technological parameter of machine parameter: heating-up temperature, holding temperature, dwell time, back pine are given up the throne and move the respective value of directly getting in the most similar example, the technological parameter that other are controlled indirectly by machine parameter: injection pressure, injection speed, dwell pressure, back pressure, screw rod rotational speed, convert machine parameter to theoretical value, required injection machine parameter is by obtaining in the injection moulding hangar;

Described example correction is meant determines undetermined technological parameter in the parameter absorption, comprises inject time, injection start position, injection final position, plasticizing final position.

3. by the described determination method of plastic injection technological parameter of claim 2, it is characterized in that: described cad file is a stl file.

4. by claim 1 or 2 or 3 described determination method of plastic injection technological parameter, it is characterized in that: the technological parameter of described object instance converts the injection machine technological parameter to through object instance technology.

5. by the described arbitrary determination method of plastic injection technological parameter of claim 1-4, it is characterized in that: described similarity value determined value is 0.85.

6. by the described arbitrary determination method of plastic injection technological parameter of claim 1-5, it is characterized in that: described calculating and reasoning are all handled on computers, and described plastics rerum natura storehouse, injection moulding hangar, case library are stored on the storer of computing machine.

7. by the described arbitrary determination method of plastic injection technological parameter of claim 1-6, it is characterized in that: the communication interface of definite technological parameter by controller of plastic injection molding uploaded in the controller.

8. injection machine, it is characterized in that: it comprises injection machine main frame, memory, technological parameter processor and controller, described memory stores case library, plastics rerum natura storehouse and injection moulding hangar, described technological parameter processor is determined technological parameter by above-mentioned determination method of plastic injection technological parameter, and technological parameter is transferred to controller.

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