Mar as urrainn dhut an cearcall cumadh stealladh a ghiorrachadh ann an inneal cumadh stealladh china?

Mar as urrainn dhut an cearcall cumadh stealladh a ghiorrachadh ann an inneal cumadh stealladh china?

Anns a 'chomann gnìomhachais seo a tha a' sìor fhàs farpaiseach, tha leasachadh èifeachdas toraidh na chùis airidh air aire. Tha an artaigil seo a’ toirt cunntas air grunn dhòighean air cearcall an in-stealladh a leasachadh le bhith a’ cleachdadh gnàthaichte no ùr-dhealbhaichte innealan cumadh stealladh china no molltairean

Cearcall stealladh

Tha an cearcall stealladh de inneal cumadh in-stealladh china air a stiùireadh gu h-uisgeach a’ toirt iomradh air toiseach clampadh molltair chun ath clampadh molltair. Mar as trice tha clampadh molltair air a roinn ann an ceithir earrannan: clampadh molltair luath, clampadh molltair slaodach, dìon molltair le cuideam ìosal agus clampadh molltair le cuideam àrd.

Bidh an stealladh a’ tòiseachadh às deidh an clampadh le cuideam àrd a chrìochnachadh, agus tha e cuideachd air a roinn ann an grunn earrannan. Bidh am plastag leaghte a’ lìonadh a’ chuas rè an in-stealladh. Nuair a bhios an toll air a lìonadh, tha an cuideam ag èirigh gu mòr, mar sin canar an ìre pacaidh ri deireadh an in-stealladh cuideachd.

Nuair nach eil an smachd iomchaidh, bidh burrs air an toradh crìochnaichte. Tòisichidh an cuideam cumail às deidh an in-stealladh a chrìochnachadh. Leis an fhìrinn innse, bidh an fhuarachadh a’ tòiseachadh às deidh an toll a lìonadh, tha cuairteachadh teas an sgriubha fhathast èideadh, bidh e a’ tòiseachadh bhon t-suidheachadh cuideam. Nuair a bhios am molltair a 'fuarachadh, bidh an toradh crìochnaichte a’ crìonadh fon fhuachd.

Is e an obair a bhith a’ cumail cuideam a dhol tron ​​ruitheadair fuar nach eil fhathast air daingneachadh, agus lìon na fosaidhean a chruthaich an crìonadh aig cuideam grèim sa chumantas nas ìsle na cuideam an in-stealladh, gus am bi an toradh deiseil làn (gun fhiaclan) nuair a tha e air a leagail.

Nuair a tha an ruitheadair fuar air a dhaingneachadh, chan eil e ciallach am preas a chumail a-rithist, agus faodar an cuideam a thoirt gu crìch. Faodar an cuideam grèim a roinn ann an grunn earrannan, agus tha cuideam cumail gach earrann eadar-dhealaichte (mar as trice a 'lùghdachadh mean air mhean), a tha air a roinn le ùine. Tha an ùine gleidhidh iomlan air a dhearbhadh le cuideam an toraidh chrìochnaichte no às aonais dents air an toradh crìochnaichte. Dèan rèiteachadh bho ùine grèim goirid, agus àrdaich an ùine gleidhidh airson gach stealladh, gus nach bi cuideam an toraidh chrìochnaichte a’ dol am meud no gun gabhar ri dents, chan fheumar an ùine gleidhidh a mheudachadh.

Tha an “àm fuarachaidh” tha paramadair a chaidh a shuidheachadh air inneal cumadh in-stealladh china na ùine bho bhith a’ crìochnachadh a’ chuideam gu fosgladh a’ mholltair, ach bidh am fuarachadh a’ tòiseachadh cho tràth ‘s a bhios an toll molltair air a lìonadh le plastaig. Tha adhbhar an “àm fuarachaidh” is e sin toirt air an toradh crìochnaichte cumail a’ fuarachadh agus a’ daingneachadh gus nach bi e deformed leis an in-stealladh nuair a thèid a stealladh. Bu chòir a ràdh gu bheil an “àm fuarachaidh” air a thighinn bhon deuchainn.

Clampadh

Tha innealan cumadh in-stealladh china seòrsa toggle a chaidh a dhealbhadh o chionn ghoirid air cuairtean ola clampaidh molltair ath-nuadhachadh gus a bhith a’ strì airson astar clampaidh molltair nas àirde. Tha e freagarrach airson a chleachdadh fon bhun-stèidh nach eil an molltair fo ùmhlachd buaidh àrd. ,

Clampadh molltair le cuideam àrd

Le bhith a’ cleachdadh an fheachd clampaidh as ìsle a chuireas casg air an toradh crìochnaichte bho bhith a’ toirt a-mach burrs, faodaidh e an ùine a tha riatanach airson an roinn clampaidh le cuideam àrd a ghiorrachadh. A bharrachd air sin, na slatan ceangail, toglaich, agus teamplaidean molltair, innealan cumadh in-stealladh china, agus leudaichidh teamplaidean am beatha mar thoradh air cleachdadh feachd clampaidh ìosal.

Ma tha molltair le feachd clampaidh de 50t gu leòr, chan eil feum air feachd clampaidh de 51t, eadhon ged a tha feachd clampaidh nas àirde aig an inneal cumadh in-stealladh china china agad.

stealladh

Faodar an astar stealladh as àirde a chleachdadh nuair nach toir an toradh deiseil builgeanan no spotan dubha air sgàth plastaig scorched. Gu sònraichte airson cumadh stealladh le ballachan tiugh, tha tòrr àite stòraidh èadhair anns a’ chuas molltair air a lìonadh le plastaig leaghte. Tha astar stealladh ro àrd a’ cur casg air an èadhar anns a’ chuas bho bhith air a leigeil a-mach às a’ mholltair, mar thoradh air builgeanan.

Le bhith a’ cleachdadh a’ chuideam stealladh as ìsle faodaidh sin an fheachd clampaidh a tha a dhìth a lughdachadh (feachd leudachaidh), fhad ‘s a bhios tu a’ cleachdadh an teòthachd baraille as ìsle faodaidh e an giorrachadh “àm fuarachaidh”.

Cùm cuideam

Faodar an ùine gleidhidh as giorra a dhearbhadh bho chuideam an toraidh chrìochnaichte no an fhiaclan iomchaidh. Tha mòran de thoraidhean le ballachan tana ann nach fheum cuideam a chumail, leis gu bheil an ìre a-staigh den toradh deiseil air a dhaingneachadh gu bunaiteach dìreach às deidh an in-stealladh a chrìochnachadh.

Ùine fuarachaidh

Tha abairt ann: Tha am molltair gu bunaiteach na iomlaid teas. Tha, bidh am molltair an-còmhnaidh a’ toirt air falbh an teas leaghaidh tron ​​​​t-sianal uisge fuar, agus faodaidh molltair air a dhealbhadh gu ceart èifeachdas iomlaid teas a leasachadh. Ach, ma tha e ceadaichte, faodaidh fuarachadh uisge-deighe am meud a ghiorrachadh “àm fuarachaidh”. Ma tha an t-uisge deighe air fhuarachadh gus am bi am molltair co-dhlùthachadh, faodaidh an sèideadh èadhair tioram agus an inneal clampaidh molltair ròin an ìre de phuing drùchd a lughdachadh agus casg a chuir air dùmhlachd.

If the plasticizing capacity is not enough and it becomes a bottleneck, the following treatments can be done during screw design and parameter adjustment:

1. Barrier screw can increase plasticizing capacity.
2. Large diameter (C.) screw can increase plasticizing capacity.
3. Increasing the groove depth of the screw can increase the plasticizing capacity.
4. Increasing the speed of the screw can increase the plasticizing capacity (some plastics that are sensitive to shear, leithid PVC, Peata, msaa., cannot use this method).
5. Reduce the back pressure as much as possible, otherwise it will increase the plasticizing speed.
6. The hydraulic sealing nozzle is adopted, so that the injection mold can be plasticized when opening and closing the injection mold.
7. The use of pre-plasticizer design enables the screw to be plasticized during the cycle except for the injection and holding time.
8. Adopt pressure-holding device, so that the screw can be plasticized in the pressure-holding section.

Use the highest speed to open the injection mold without tearing the finished product and producing a loud injection mold opening noise. Some sophisticated injection china china injection molding machines have decompression equipment before injection mold opening, and even high-speed injection mold opening will not produce noise. In order to achieve accurate injection mold stop position under high-speed injection mold opening, brake valve or closed-loop control can be used.

On small injection china china injection molding machines with low ejection force, pneumatic ejection can be used, which is higher than hydraulic ejection speed. Electric ejection is faster than pneumatic ejection.

The injection mold can be designed to be ejected by the injection mold opening action instead of the ejection device on the injection china china injection molding machine. This method can only be ejected once. This is the simplest method of ejecting while opening the injection mold.

Using independent oil circuit, gas circuit or circuit control, it can realize the function of multiple ejection while opening the injection mold while ejecting. Gu

Equipped with video and computer equipment, it can quickly analyze whether the finished products are all dropped after one ejection. The second ejection is performed when not all of them are dropped, so 99% of the cycles in the above example are ejected only once, which saves the average cycle time.

Retreat

Some finished products can be ejected by the vibration of the injection china china injection molding machine for multiple ejections. The thimble does not need to be fully retracted each time to shorten the time of multiple ejections.

The last ejection can start at the same time as the injection mold clamping. Since the stroke of the thimble is shorter than that of the template, the thimble will always be fully retracted before the injection mold is locked.

The shortest cycle time

The shortest cycle time consists of the time required for injection mold clamping, stealladh, pressure holding, cooling and injection mold opening. Feeding is carried out at the same time during the “àm fuarachaidh” and injection mold opening and closing, and even while maintaining pressure. Multiple ejections are performed at the same time when the injection mold is opened, and the last ejection is performed at the same time when the injection mold is closed. Anns a 'chùis seo, up to three actions can be performed at the same time, and each action has an independent drive. It may be that all three are oil circuits (such as three oil pumps), and all three are circuits (electric china china injection molding machine) or a combination of oil circuits, air circuits and circuits.

Electric china china injection molding machines generally have 4 servo motors to drive injection molding, feeding, opening, closing and demolding respectively. The advantage is that the parallel operation can shorten the cycle. Leis an fhìrinn innse, the hydraulic china china injection molding machine can also achieve this goal when using 3 independent oil circuits. Mar sin, this advantage is not a patent for electric china china injection molding machines.

Since injection cannot be made when the mold is opened, the four servo motors cannot operate at the same time. The analysis in Figure 10 shows that the three parallel actions have reached the shortest period.

Dry run time

Many china china injection molding machine specifications indicate the dry running time, but generally it is only calculated theoretical time, ignoring the acceleration and deceleration of the template, and of course the quality of the moving mold is not calculated, which is shorter than the actual mold opening and closing time. . According to Euromap’s standard, the idle running time is the time required for the template to open and close, and the opening and closing stroke is set at 0.7 times the four-column space. In the shortest cycle, only mold opening and closing time (idle running time) and injection time are related to the design of the china china injection molding machine.

Thin wall injection

Thin-wall injection molding is defined as injection molding with a wall thickness of 0.5 mm or less, or a process/wall thickness ratio of 300 no barrachd. In order to prevent the molten plastic from solidifying before filling the cavity, thin-wall injection molding is high-speed (and high acceleration/deceleration) cumadh stealladh. The so-called high-speed injection molding means that the forward speed of the screw is above 300 mm/s. Under high-speed injection molding, the injection time is generally within 0.5s. High-speed injection is assisted by accumulators. The oil pump fills the accumulator during the “àm fuarachaidh”, or a small oil pump can be used to fill the accumulator during times other than injection and pressure holding. The stored high-pressure oil is released during injection, which can generally increase the injection speed by 3 amannan.

Blow demoulding

If the product can be demolded by blowing, it is easy to blow while opening the mold. San fharsaingeachd, the air blowing is delayed after the mold is opened to hide the demolding time in the mold opening time.

Pneumatic demolding

Pneumatic ejection is realized on a small china china injection molding machine that requires little ejection force, so that mold opening and closing are parallel to ejection and ejection, which saves about 1s of ejector action time, which is considerable on small china china injection molding machines. , And finally reached a cycle time of 2s.

Second best

The cost of an china china injection molding machine with three independent oil circuits is relatively high. Two parallel-action china china injection molding machines generally use one oil circuit for the clamping device and another oil circuit for the injection device. This is based on the general division of china china injection molding machines.

Consider the oil circuit board of the clamping device and the oil circuit board of the injection device.

Hybrid oil-electric china china injection molding machine integrates the advantages of two drives, and is ingeniously matched. The general design is electric feeding and other actions of hydraulic pressure, such as FLYSE china injection molding machine.

Double pump injection

The dual pump design uses only one oil pump during injection. The oil circuit can be slightly changed so that the two pumps are used for injection, thereby increasing the injection speed to nearly double.

Hot runner mold

The hot runner can shorten the cycle in many ways.

1. If the diameter of the cold runner is larger than the thickness of the finished product, an “àm fuarachaidh” will have to wait for the runner to cool to a certain degree before the mold can be opened, but the finished product has already cooled down, causing waste. The runner of the hot runner mold does not need to be cooled, and the finished product determines the cooling time.

2. The amount of plastic in the cold runner is a percentage of the amount of finished plastic, even if it is heavier than the finished product, the injection and feeding time will be lengthened. The use of hot runner molds saves the injection and feeding time required for runner plastics.

3.There are nozzles in the cold runner, and the mold opening stroke should be increased.

4. In multi-cavity injection molding, the cold runner does not guarantee whether the finished product will fall or not. It needs to be taken out with a robotic arm (automatic operation) or manually (semi-automatic operation), and the cycle will be slowed down.