CN102320114A - Rapid heating cycle molding (RHCM) process and die with telescopic sprue bush - Google Patents

Rapid heating cycle molding (RHCM) process and die with telescopic sprue bush Download PDF

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Publication number
CN102320114A
CN102320114A CN201110163318A CN201110163318A CN102320114A CN 102320114 A CN102320114 A CN 102320114A CN 201110163318 A CN201110163318 A CN 201110163318A CN 201110163318 A CN201110163318 A CN 201110163318A CN 102320114 A CN102320114 A CN 102320114A
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CN
China
Prior art keywords
plate
sprue bush
heating
cover
heating plate
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CN201110163318A
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Chinese (zh)
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CN102320114B (en
Inventor
黄风立
顾金梅
赵云
许锦泓
娄勇坚
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嘉兴学院
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Priority to CN201110163318.8A priority Critical patent/CN102320114B/en
Publication of CN102320114A publication Critical patent/CN102320114A/en
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Publication of CN102320114B publication Critical patent/CN102320114B/en

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Abstract

The invention provides a rapid heating cycle molding (RHCM) process using a telescopic sprue bush. The process comprises the following steps of: heating and cooling hot plates; and controlling the temperature at the heating and cooling stages, wherein, at the cooling stage, the upper hot plate and the lower hot plate can be bounced away from a plate A and a plate B through a spring. In the invention, in order to smoothly bounce away the plate A, the sprue bush is divided into an upper sprue bush part and a lower sprue bush part, and the two parts can slide to each other. The invention further provides a rapid heating cycle die with the telescopic sprue bush. The rapid heating cycle die comprises a fixed die part and a moving die part, wherein, the fixed die part comprises the telescopic sprue bush, the upper hot plate and a fixed die assembly; and the moving die part comprises the lower hot plate and a moving die assembly. By adopting the RHCM process and die with the telescopic sprue bush, cores and cavities of the dies can be more uniformly heated and cooled so as to obtain the plastic injection molding product with high appearance quality.

Description

Rapid thermal cycles Shooting Technique and mould with scalable sprue bush

Technical field

The present invention relates to a kind of Shooting Technique and mould of plastic injection mould rapid thermal cycles, belong to the mould for plastics technical field.

Background technology

In traditional injection mo(u)lding, plastic melt is with after die surface contacts, and mold temperature generally can be reduced to below 90 ℃, and begins to cool down from bath surface and to solidify.When the plastic melt of different directions meets, can form weld mark at product surface.The rapid thermal cycles injection molding process adopts the technology that becomes the mould temperature, can address the above problem, and obtains high accuracy, does not have the product that melts trace.Research shows that in injection phase, if can keep mold temperature more than 100 ℃, especially, when mold temperature reached more than 150 ℃, the part strength that injection mo(u)lding is produced was high; This is because mould is heated when injection moulding, makes the flowability of raw material in die cavity improve, and the stress of having avoided the cooling back to be easy to generate because of internal density is inhomogeneous is concentrated.In addition, because the superficial density of part is also very even, this makes surface quality of workpieces very good.But the rapidity of the heating and cooling of mould and uniformity are the key issues that this technology popularization of restriction is used.

To the problems referred to above, the researcher has researched and developed numerous mould Fast Heating modes, as: Steam Heating, electrical heating, electromagnetic induction heating, Infrared Heating, heat conduction heating etc., the version and the method for realization are various.But still there are problems such as the bad and thermal efficiency of heating uniformity is lower.

Summary of the invention

The purpose of this invention is to provide a kind of simple in structure, heating and cooling rapidly, evenly, save the energy, and safe and reliable rapid thermal cycles Shooting Technique and mould.

The present invention will solve is the heating that exists of existing Shooting Technique and inhomogeneous cooling is even, the thermal efficiency is low, and the product of being produced has the problem of molten trace etc.

For realizing the object of the invention, the rapid thermal cycles Shooting Technique of scalable sprue bush of the present invention comprises hot plate heating period and cooling stage; Heating period and cooling stage are carried out temperature control;

Heating period: go up heating plate and contact with the A plate, following heating plate contacts with the B plate, and this way of contact contact area is big, and heat transfer by heat conduction speed is fast, homogeneous heating; In the heating period, mould closes (matched moulds), and accomplish injection, pressurize;

Cooling stage: a bit of distance of die sinking at first, heating plate and A plate are separated, following heating plate separates with the B plate, feeds cooling water again and cools off, and, opens mould fully during to design temperature etc. mold cools down again, ejects plastic;

Temperature control: according to the temperature of mold cores and die cavity, the heating power of heating plate and following heating plate in the control, and control flow of cooling water speed.

Because the present invention is designed with scalable sprue bush, so, cooperate pull bar screw and flexible member at cooling stage; Heating plate was separated with A plate (core) in the mold cools down stage, and when avoiding the core cooling, last heating plate still heats it; Therefore; Cooling water only to A plate (core) cooling, can reach quick cooling, reduces thermal loss simultaneously.

Heating plate ways of connecting down of the present invention makes down heating plate when die sinking for the first time, and following heating plate separated with B plate (die cavity) in the mold cools down stage; When avoiding the die cavity cooling; Following heating plate still heats it, and therefore, cooling water only cools off B plate (die cavity); Can reach quick cooling, reduce thermal loss simultaneously.

Rapid thermal cycles mold for injection molding with scalable sprue bush of the present invention; Comprise cover half part and dynamic model part; Described cover half partly comprises scalable sprue bush, goes up heating plate and cover half assembly; Dynamic model partly comprises heating plate and dynamic model assembly down, and described scalable sprue bush comprises sprue bush and submarine gate cover, the top that is placed in sprue bush suitable for reading of submarine gate cover.

The invention has the beneficial effects as follows: rapid thermal cycles Shooting Technique and the mould that has scalable sprue bush of the present invention; Owing to designed scalable sprue bush and flexible member; Can realize: in the heating period; Last heating plate and A plate (core) to be heated and following heating plate and B plate (die cavity) heat conduction contact area to be heated are big, and heating rapidly and uniformity of temperature profile; At cooling stage, last heating plate and A plate (core) and following heating plate and B plate (die cavity) separate, and reach the rapid and few effect of energy loss of cooling.The product quality that the present invention produces is high, and cost is low.

Description of drawings

Fig. 1 is a three-dimensional dimension sketch map of the present invention.

Fig. 2 is the A-A generalized section of Fig. 1.

Fig. 3 is the B-B generalized section of Fig. 2.

Fig. 4 is the structural representation after a bit of distance of the first die sinking of Fig. 2.

Fig. 5 is the structural representation after the complete die sinking of Fig. 2.

Fig. 6 is for having the scalable sprue bush structural representation of flexible member (spring).

Fig. 7 is for having the scalable sprue bush decomposition texture sketch map of flexible member (spring).

The specific embodiment

In order more to clearly demonstrate technical problem, technical scheme and the beneficial effect that the present invention will solve,, the present invention is further elaborated below in conjunction with Figure of description and specific embodiment.

As shown in the figure, the rapid thermal cycles Shooting Technique with scalable sprue bush of the present invention comprises hot plate heating period and cooling stage; Heating period and cooling stage are carried out temperature control;

Heating period: go up heating plate 4 and contact with A plate 23, following heating plate 1 contacts with B plate 2, and this way of contact contact area is big, and heat transfer by heat conduction speed is fast, homogeneous heating; In the heating period, mould closes, and accomplish injection, pressurize;

Cooling stage: a bit of distance of die sinking at first, heating plate 4 and A plate were opened in 23 minutes, following heating plate 1 was opened with the B plate in 2 minutes, fed cooling water again and cooled off, and, opened mould fully during to design temperature etc. mold cools down again, ejected plastic;

Temperature control: according to the temperature of mold cores 15 and die cavity 16, the heating power of heating plate 4 and following heating plate 1 in the control, and control flow of cooling water speed.

Last heating plate 4 was opened through flexible member with the A plate and is flicked spring or adopt non-resilient element to separate in 23 minutes; Following heating plate 1 was opened through flexible member spring 9 with the B plate and is flicked or adopt non-resilient element to separate in 2 minutes.

Die cavity 16 is embedded in A plate 23 bottoms or die cavity 16 is integrative-structure with A plate 23, and core 15 is embedded in B plate 2 tops or is integrative-structure with B plate 2.

Temperature control is meant: heat sensor, comprise thermoelectricity occasionally the digital temperature appearance put into core 15 or die cavity 16, through the temperature of feedback system control mould; Described feedback system is meant that delivering to control module to the temperature signal that records from heat sensor handles, and is controlled the power of heating plate 4 and following heating plate 1 again by control module, the speed of control flow of cooling water.The function of control module is the treatment temperature signal, and the power of heating plate 4 and following heating plate 1 is gone up in control again, and the speed of flow of cooling water.

Rapid thermal circulation injection mould with scalable sprue bush of the present invention comprises cover half part and dynamic model part; Described cover half partly comprises scalable sprue bush, goes up heating plate 4 and cover half assembly; Dynamic model partly comprises heating plate 1 and dynamic model assembly down; Described scalable sprue bush comprises sprue bush 20 and submarine gate cover 21, the top that is placed in sprue bush 20 suitable for reading of submarine gate cover 21.

Under the matched moulds state; The end face of last sprue bush 20 peaks at the submarine gate and overlaps on the inner bottom surface of 21 head cavitys; Described sprue bush 20 tops of going up are provided with cylindrical section 29; The submarine gate overlaps 21 circular cavities 30 that are provided with suitable for reading, and cylindrical section 29 of sprue bush 20 is placed in the circular cavity 30 of submarine gate cover 21 and goes up between the chamber wall of Duan Biyu submarine gates cover circular cavities 30 of sprue bush cylindrical section 29 and leave little gap on this, so that go up sprue bush cylindrical section 29 slip in submarine gate cover circular cavity 30; The distance that last sprue bush 20 slides in submarine gate cover 21 is slightly larger than the ultimate range that heating plate 4 and A plate 23 flick, and this maximum flicks distance through 3 qualifications of pull bar screw.

Last sprue bush 20 is provided with elastomeric element 22, and described elastomeric element comprises spring.Described periphery of going up heating plate 4 is provided with thermal insulation layer 18.The described periphery of heating plate 1 down is provided with thermal insulation layer 1-1.

Described cover half assembly comprises A plate 23, die cavity 16; Cover half fixed head 22; Pull bar screw 3, locating ring 19, cover half flexible member 6, guide pillar 8, guide pin bushing 7, hold-down screw 5, hold-down screw 17, die cavity 16 are embedded in the A plate 23; Connect through hold-down screw 5, hold-down screw 17 between cover half fixed head 22, A plate 23 and the last heating plate 4, be provided with pull bar screw 3 between last heating plate 4 and the A plate 23.Locating ring 19 is located on the cover half fixed head 22.Guide pillar 8, guide pin bushing 7 are located at A plate 23 avris, and cover half flexible member 6 is located between A plate 23 and the last heating plate 4.The dynamic model assembly comprises B plate 2, core 15, supports backing plate 10, dynamic model flexible member spring 9, attachment screw 11, dynamic mould fixing plate 12, thimble fixed head 13, ejector retainner plate 14, push rod 24, sprue puller 25 and ejector retainner plate guide pillar 26; Core 15 is embedded in the B plate 2; Connect through attachment screw 11 between dynamic mould fixing plate 12, support backing plate 10 and the following heating plate 1; Dynamic model flexible member spring 9 is located at down between heating plate 1 and the B plate 2, and ejector retainner plate 12 is located on the thimble fixed head 13, and ejector retainner plate fixed head 13 is located on the dynamic mould fixing plate 12; Push rod 24 is located on the ejector retainner plate 14 with sprue puller 25, and ejector retainner plate guide pillar 26 is located at down between heating plate 4 and the ejector retainner plate 14.

Dynamic model flexible member spring 9 also can be a rubber; The cover half flexible member comprises spring, push rod rod guidance post spring 27 or rubber.

Specify clamping system of the present invention at present:

Last sprue bush 20 heads are contained on the cover half fixed head 22, and pass heating plate 4 bottoms and insert in the submarine gate cover 21.The submarine gate overlaps 21 heads and A plate 23 end face or a little less than A plate end face, top and runner cavity join, and flushes with runner, also can be lower slightly or a little more than the runner cavity.

Described scalable sprue bush, when mould closes, last sprue bush 20 tops and the submarine gate overlap 21 head cavity inner bottom surfaces and fit.For guaranteeing still reliably to contact after the repeatedly injection moulding; Described scalable sprue bush first die sinking a bit of apart from the time; Last sprue bush 20 and submarine gate cover 21 contact the cylindrical section segment distance that can effectively slide; This distance can be limited on pull bar screw 3, still keeps in touch with the chamber wall that guarantees the sprue bush 20 cylindrical section walls and the submarine gate 21, and the power of slip is driven by cover half flexible member spring 6.For guaranteeing that going up sprue bush 20 breaks away from submarine gate cover 21, is provided with spring 28 on last sprue bush 20.In addition, during die sinking for the first time, last heating plate 4 flicks power except that utilizing cover half flexible member spring 6 with A plate 23, also can adopt mechanical system to realize.

Described heating plate 4 and the last sprue bush 20 gone up, heat insulation between following heating plate 1 and push rod 24 and the sprue puller 25 etc., gap fiting mode greatly, the guide pillar 8 that is installed in down on the heating plate 1 also separates with heat-insulating material, avoids direct contact heat transfer.In addition, because heated contact surface is long-pending big, firing rate is fast.

Last heating plate 4 that the present invention is provided with separately and following heating plate 1 can supply to arrange that the space of heating element heater (heat pipe, high temperature oil, high-temperature steam) is big except that the assembling of minority parts is passed, heat up rapidly, and the appearance control of the uniformity of hot plate temperature.

In the described rapid thermal cycles technology that has a scalable sprue bush, (see figure 3) under the matched moulds state, last heating plate 1 and play heating plate 4 carry out contact thermal through the contact conduction to A plate 23 (core 16) and B plate 2 (die cavity 15) and conduct and heat.Be furnished with thermocouple etc. in core 15 and the die cavity 16, after being heated to design temperature, start injection and pressurize.After pressurize is intact, carry out the die sinking first time, see accompanying drawing 4.For the first time die sinking tool distance is less, equals heating plate 4 and flicks distance with A plate 23 and flick apart from sum with following heating plate 1 and B plate 2.Then, core 16 and die cavity 15 logical cooling waters are cooled off, owing to only core 16 and die cavity 15 are cooled off, cooling velocity is fast, and it is little that salband is walked heat.After the die sinking temperature that is cooled to set, stop logical cooling water, carry out the die sinking second time, see accompanying drawing 5.Push rod 24 ejects after the die sinking.At last, carry out matched moulds again, accomplish an injection cycle.

The above is merely one embodiment of the present of invention; Not in order to restriction the present invention; Allly described specific embodiment is made various modifications or replenish, or be equal to replacement and improvement etc., all should be included within protection scope of the present invention person of ordinary skill in the field of the present invention.

Claims (10)

1. the rapid thermal cycles Shooting Technique with scalable sprue bush is characterized in that this technology comprises hot plate heating period and cooling stage; Heating period and cooling stage are carried out temperature control;
Heating period: go up heating plate and contact with the A plate, following heating plate contacts with the B plate, and this way of contact contact area is big, and heat transfer by heat conduction speed is fast, homogeneous heating; In the heating period, mould closes, and accomplish injection, pressurize;
Cooling stage: a bit of distance of die sinking at first, heating plate and A plate are separated, following heating plate separates with the B plate, feeds cooling water again and cools off, and, opens mould fully during to design temperature etc. mold cools down again, ejects plastic;
Temperature control: according to the temperature of mold cores and die cavity, the heating power of heating plate and following heating plate in the control, and control flow of cooling water speed.
2. the rapid thermal cycles Shooting Technique with scalable sprue bush as claimed in claim 1 is characterized in that heating plate and A plate separate through flexible member to flick or adopt non-resilient element to separate; Following heating plate separates through flexible member with the B plate and flicks or adopt non-resilient element to separate; Said flexible member comprises spring.
3. the rapid thermal cycles Shooting Technique with scalable sprue bush as claimed in claim 1 is characterized in that die cavity is embedded in A plate bottom or die cavity and A plate and is integrative-structure, and core is embedded in B plate top or is integrative-structure with the B plate.
4. the rapid thermal cycles Shooting Technique with scalable sprue bush as claimed in claim 1 is characterized in that temperature control is meant: heat sensor, comprise thermoelectricity occasionally the digital temperature appearance put into core or die cavity, through the temperature of feedback system control mould; Described feedback system is meant that delivering to control module to the temperature signal that records from heat sensor handles, and is controlled the power of heating plate and following heating plate again by control module, the speed of control flow of cooling water.
5. rapid thermal circulation injection mould with scalable sprue bush; It is characterized in that this mould comprises cover half part and dynamic model part; Described cover half partly comprises scalable sprue bush, goes up heating plate and cover half assembly; Dynamic model partly comprises heating plate and dynamic model assembly down, and described scalable sprue bush comprises sprue bush and submarine gate cover, the top that is placed in sprue bush suitable for reading of submarine gate cover.
6. the rapid thermal circulation injection mould with scalable sprue bush as claimed in claim 5; It is characterized in that under the matched moulds state; The end face of last sprue bush peaks on the inner bottom surface of submarine gate cover head cavity; The described sprue bush top of going up is provided with cylindrical section; The submarine gate cover circular cavity that is provided with suitable for reading, the cylindrical section of sprue bush is placed in the circular cavity of submarine gate cover and goes up between the chamber wall of Duan Biyu submarine gate cover circular cavity of sprue bush cylindrical section and leave little gap this on, so that upward the sprue bush cylindrical section can slide in the submarine gate overlaps circular cavity.
7. the rapid thermal circulation injection mould with scalable sprue bush as claimed in claim 5 is characterized in that sprue bush is provided with elastomeric element, and described elastomeric element comprises spring.
8. the rapid thermal circulation injection mould with scalable sprue bush as claimed in claim 5 is characterized in that described periphery of going up heating plate and following heating plate is provided with thermal insulation layer.
9. the rapid thermal circulation injection mould with scalable sprue bush as claimed in claim 5 is characterized in that described cover half assembly comprises A plate, die cavity, the cover half fixed head; Pull bar screw, locating ring, cover half flexible member; Guide pillar, guide pin bushing and hold-down screw, die cavity are embedded in the A plate, connect through hold-down screw between cover half fixed head, A plate and the last heating plate; Be provided with the pull bar screw between last heating plate and the A plate; Locating ring is located on the cover half fixed head, and guide pillar, guide pin bushing are located at A edges of boards side, and the cover half flexible member is located between A plate and the last heating plate; The dynamic model assembly comprises B plate, core, support backing plate, dynamic model flexible member, attachment screw, dynamic mould fixing plate, thimble fixed head, ejector retainner plate, push rod, sprue puller and ejector retainner plate guide pillar; Core is embedded in the B plate; Connect through attachment screw between dynamic mould fixing plate, support backing plate and the following heating plate; The dynamic model flexible member is located at down between heating plate and the B plate, and ejector retainner plate is located on the thimble fixed head, and the ejector retainner plate fixed head is located on the dynamic mould fixing plate; Push rod and sprue puller are located on the ejector retainner plate, and the ejector retainner plate guide pillar is located at down between heating plate and the ejector retainner plate.
10. the rapid thermal circulation injection mould with scalable sprue bush as claimed in claim 9, its characteristic comprises spring or rubber at the dynamic model flexible member; The cover half flexible member comprises spring, push rod rod guidance post spring or rubber.
CN201110163318.8A 2011-06-17 2011-06-17 Rapid heating cycle molding (RHCM) process and die with telescopic sprue bush CN102320114B (en)

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Application Number Priority Date Filing Date Title
CN201110163318.8A CN102320114B (en) 2011-06-17 2011-06-17 Rapid heating cycle molding (RHCM) process and die with telescopic sprue bush

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Application Number Priority Date Filing Date Title
CN201110163318.8A CN102320114B (en) 2011-06-17 2011-06-17 Rapid heating cycle molding (RHCM) process and die with telescopic sprue bush

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CN102320114A true CN102320114A (en) 2012-01-18
CN102320114B CN102320114B (en) 2014-04-30

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103707472A (en) * 2013-12-06 2014-04-09 台州市黄岩炜大塑料机械有限公司 Plastic pipe die product outward ejection mechanism
CN103722653A (en) * 2013-05-27 2014-04-16 昆山德安模具设计有限公司 Novel multifunctional injection molding machine
CN103722654A (en) * 2013-05-27 2014-04-16 昆山德安模具设计有限公司 Novel intelligent injection molding machine
CN103722713A (en) * 2013-05-27 2014-04-16 昆山德安模具设计有限公司 Intelligent injection molding machine
CN105172047A (en) * 2015-09-14 2015-12-23 贾玉平 Injection mold for producing large thin-walled product
CN105437485A (en) * 2015-12-08 2016-03-30 深圳天珑无线科技有限公司 Mechanism and method for improving plastic product combining line

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101518932A (en) * 2009-04-09 2009-09-02 林建岳 Simplified steam-heat and high-light injection mold with clutch type cooling structure
CN102019396A (en) * 2009-09-14 2011-04-20 牟维军 Ejection mechanism with movable sprue bush and pulling board

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101518932A (en) * 2009-04-09 2009-09-02 林建岳 Simplified steam-heat and high-light injection mold with clutch type cooling structure
CN102019396A (en) * 2009-09-14 2011-04-20 牟维军 Ejection mechanism with movable sprue bush and pulling board

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103722653A (en) * 2013-05-27 2014-04-16 昆山德安模具设计有限公司 Novel multifunctional injection molding machine
CN103722654A (en) * 2013-05-27 2014-04-16 昆山德安模具设计有限公司 Novel intelligent injection molding machine
CN103722713A (en) * 2013-05-27 2014-04-16 昆山德安模具设计有限公司 Intelligent injection molding machine
CN103707472A (en) * 2013-12-06 2014-04-09 台州市黄岩炜大塑料机械有限公司 Plastic pipe die product outward ejection mechanism
CN103707472B (en) * 2013-12-06 2016-02-10 台州市黄岩炜大塑料机械有限公司 Plastic pipe die product outward ejection mechanism
CN105172047A (en) * 2015-09-14 2015-12-23 贾玉平 Injection mold for producing large thin-walled product
CN105437485A (en) * 2015-12-08 2016-03-30 深圳天珑无线科技有限公司 Mechanism and method for improving plastic product combining line
CN105437485B (en) * 2015-12-08 2017-12-08 深圳天珑无线科技有限公司 Improve the mechanism and method of plastic cement products joint line

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