1. Pritisak
The princip of pressure setting is: the corresponding strength to overcome the resistance of the action, but the parameter value needs to be adjusted accordingly to match the speed of the action.
2. Brzina
Surađujte s the the above pressure to complete the required activity speed (the flow rate of system hydraulic oil) of each action program. The basic speed levels are divided into: slow flow 0.1-10, slow speed 11-30, medium speed 31-60}, and high speed 61-99.
1. The control of the injection speed is applied to different product structures and materials to set the size values. We will not distinguish them here (engineering/general plastics, crystalline/amorphous plastics, high-temperature/low-temperature plastics, soft/hard plastics) It is easy to confuse people. To give a more understandable explanation, injection speed is a process element that is difficult to control in injection molding. Unlike other process elements, there are standard data for reference (will be introduced in detail later).
Ovisi o the fluidity of the material; soft plastics such as PP, LDPE, TPE, TPR, TPU, TPU, PVC and other soft plastics have good fluidity and have small cavity resistance when filling. Općenito, a lower injection speed can be used filling. Cavity. Cavity. Commonly used medium-viscosity plastics such as ABS, HIPS, GPPS, POM, PMMA, PC+ABS, Q glue, HDPE% 2c etc. have slight poor fluidity. When the product appearance gloss not required or the product thickness is moderate (product When the wall thickness or bone thickness or bone thickness 1,5MM or more), the injection speed can be filled at a medium speed. Otherwise, the filling speed needs to be appropriately increased accord to the product structure or appearance requirements.
Inženjering plastika takve PC, PA+GF, PBT+GF, LCP have poor fluidnost i općenito require high-speed injection during filling, especially materials with added GF (staklo vlakna). If the injection speed is too slow, surface of the product will be damaged. The floating fiber (silver streak on the surface) is serious.
2. Control of talje brzina;
Ova parametar je one of the most easily previđen procesi in daily work, jer most kolege believe that this process has little impact on mouldding, and products can be produced by adjusting the parameters at will. Međutim, in injection mouldding, the melt parametri are the same as those of the injection process. The glue speed is is equal important. The melt speed can direkt afekt the melt mix effect, mouldding Cycle and other important links.
3. Kontrola plijesan otvaranje i zaključavanje brzina;
Postavka različiti parametri uglavnom za za različite plijesni strukture, takve kao podešavanje velika brzina plijesan stezanje prije početak niska plijesan stezanje tlak za a dvoslojna ravna plijesan temelj proizvod lišće plijesan plijesan učinkovito poboljšanje proizvodnja učinkovitost. Međutim, kada podešavanje the speed of mold , opening and locking for moulds s rows rows rows, the speed and speed of mold opening and locking must be determined accord to the height and structure of the rows. Special mold structures the rows. Special mold structures and core-pulling mold are explained in the following chapters due to their complex structures.
4. Control of naprstak brzina;
It uglavnom ovisi on the demoulding condition of the product. In principle, it should be as fast as possible on the premise of ensure that the product does not appear white, high, or deformed. Otherwise, the parametri need to be adjusted appropriately according to the actual situation. Of course; under normal circumstances, the first time to adjust the demoulding The true speed should be medium to low speed (15%-35%), which can Effective extend the service life of the Ejector Pin And Ejector Cilindar.
3.+Location
Prebacivanje točke između brzo i sporo brzina, high and low pressure of each action
1. Control of injection position;
During injection mouldding parametar ispravljanje pogrešaka, the injection position needs to be adjusted accord to the unit weight and structure of the product. When adjusting the position by considering the unit weight of the product, it is often said that the amount of glue required for the product,
For example: a product has a unit weight of about 50G and is produced using a 90T injection molding machine. The theoretical injection volume of this model is 120G and the melting stroke is 130MM. The approximate melt weight per MM is the theoretical injection volume of 120G÷the melting stroke of 130MM. =0.92G, that is, the injection distance of the product is 50×0.92=46MM position. If the melt end position is set at 60MM, then the product quality is basically OK when the injection reaches 14MM.
(Of course, the above is based on experience, and there are some deviations, because the screw compression ratio calculation formula in the book is not followed. It is too complicated, and I believe most colleagues cannot calculate it.) As for how to use the the injection position to control various letvice Defects in The proizvod.
2. Control of melt position;
Općenito speaking, it is shvaćen that the melt distance is set in response to the required injection amount of the molded product. Most colleagues ignore the three-stage switching position of the melt and only focus on the melt position. Of course; for molded products of ordinary difficulty, the melt position must be adjusted It is not necessary to switch between fast and slow speed or high and low back pressure, i the required product quality can still be achieved. Međutim, when producing color masterbatch and highly heat-sensitive plastika, it is better to appropriately switch the melt speed and back pressure adjustment position. to control product quality.
3. Položaj kontrola od plijesan otvaranje i zaključavanje;
The switching point is uglavnom set accord to the needs of mold opening and locking speed.
3.1 Under normal okolnosti, the switching point of mold opening speed is slow speed before the mold product leaves the mold cavity (about 5-15MM), then fast speed, which can Effectively shorten the time required for mold opening, and finally slow speed (tj. plijesan otvaranje međuspremnik). Položaj, općenito 20-40MM away from the required end position of mold opening, it is better to start switching (the end position depends on the product structure and whether a robot is used), which can Effective extend the service life of the injekc Machine and the stability of The Mold Opening Action).
The structural factors of some special molds, such as three-plate molds or core-pulling molds, the mold opening speed needs to be determined according to the actual situation. For example, the three-plate mold has the product cavity on the middle plate. When opening the mold, the first action is on the nozzle plate, and the nozzle needs to be After the runner is separated from the product, the male and female molds are separated again, so 1-2 switching points need to be added at the mold opening position, which are medium speed-slow speed-high speed-slow speed. Machines with larger tonnage can be adjusted as needed. Add a few more switching points, in short, the quality of the molded products will not be affected during the mold opening process and the movement process will be smooth.
3.2 The setting of the stezanje položaj uglavnom ovisi on the struktura of the mold. For example: the flat mmould structure (to is, the parting surfaces of the the front and rear mold are are both flat, no slider/core pulling, no insertion structure) switches at the steznica speed. You can directly use the 4-}Position Position To Perform "fast-medium speed-low pressure-high pressure". The switching princip of the position is: the fast mold stezanje tak je po mogućnosti about 70% of the mold opening stroke. (The quick end position of the the three-plate mold depends on Depends on the the constructal size of the mold), its main function is to shorten the mold steznica ciklus. After the medium speed, it acts as a deceleration buffer for high-speed mold locking (because it will switch to the low-voltage protection funkcija after the medium speed)
The end position of the the mold mold stezanje medium speed is very important, as it determines the the starting position of the mmould stezanje low voltage protection. Some iskusni kolege are very confused about the mold clamping low voltage and think that the mold can be locked by any setting. In fact, this is not the case. If the mold stezanje nisko tlak je set nepravilno, its zaštitna funkcija will be potpuno izgubljena, Which Is Fatal To Full Automatic Mold Production.
4. Control of ejector pin position;
Teoretski, the ejection length of the ejector pin is twice the height of the mold cavity (tj. , the mold core) behind the mold. Međutim, in actual operation, it is not needed to set the position exactly accord to this method. Specifically, it is uglavnom to facilitate the removal the product. Međutim, when adjusting the Ejector pin position for the first time, it Is Necessary To Postupno Lengthen it. First, 50% of the mold ejector pin stroke must be ejected, and then it depends on the removal status of the product during the the production process.
4. Temperatura
Nužno uvjeti obavezno za plastika taljenje i plijesan grijanje
1. Kontrola materijala cijev temperatura;
Općenito speaking, plastics with different properties have relative standard mouldding temperatures, such as: ABS= (disting between 230-260} for high-impact materials and 190-230} for low-impact materials), SAN=180-220, HIPS=180- 220, POM=170-200}, PC=240-300}}, ABS/PC=230-260, PMMA=200-230% 2c PVC= (distinguish high gustoća 160-200, low gustoća 140-180), PP=180-230 , PE= (disting between high density 240-300} and low gustoća 180-230});
TPE= (distinguish high gustoća 170-200, low gustoća 140-180), TPR= (distinguish high gustoća 170-200, low gustoća {{{5{5}5}}; d}), TPU= (distinguish high gustoća 160-200, low gustoća 120-160) PA=230-270, PA+fiber=250-300, PBT{{12% 7d}, PBT+fiber=240-280. In addition, the mouldding temperatura of adding Flame retardants (tj. vatra retardant materijali) treba biti 20-30 degrees lower than ordinary materials. The specific use temperature depends on the production situation, because the mouldding temper direktno afekt the fluidity, viskoznost, mold temperature, color, shrinkage rate, product deformacija, etc. of the plastika.
2. Kontrola plijesni temperatura;
The plijesan temperatura uglavnom ovisi on the fluidity of different plastics. A simple understanding is is that it the key process to overcome poor fluidity. For example, PC materials and PA+ fiber materials have poor fluidity, and their flow resistance during the filling process is large, so they need to be faster. The glue injection speed is used for filling.
In addition, when producing PC transparent plastic parts, a higher mold temperature is required to improve surface air marks, rainbow marks, internal bubbles and other undesirable problems. When producing fiber-added materials, if the mold temperature is low, silver streaks will appear on the surface ( floating fibers).
Pod normal okolnosti, you can refer to the following data to adjust the mold temperature:
ABS=30-50 (Proizvodi s visoka površina kvaliteta zahtjevi or deformacija kontrola can be podignut to 60-110 degrees) PC=50-80 (Proizvodi s high surface quality requirements or thin-walled products can be raised to 85-140 degrees) HIPS= 30-50 (transparent PS and products with high surface quality requirements can be raised to 60-80 degrees)
PMMA=60-80 (tankozidni proizvodi i proizvodi s high surface quality requirements can be raised to 80-120} degrees) PP=10-50, PE=10-50 (visoka gustoća or tanko-stijenka proizvodi can increase the mold temperatura appropriately) Rubber (TPE, TPR, TPU)=10-50},
PA, PBT=30-60 (materijali s visoko površina kvaliteta zahtjevi i staklo vlakna dodana can be povećana to 70-100)
5. Vrijeme
The time each action takes to execute
1. Control of filling time;
Uključujući ubrizgavanje vrijeme i držanje vrijeme
1.1. Injekcija vrijeme:
Općenito speaking, if the the quality of the product is qualified, the the shorter the better. Because the injection time direkt impactcts the internal stress and production cycle of the product, in principle, the glue position of the product, the the contrary, for debele stijenke proizvodi, the control time is The shrinkage problem requires extending the injection time as appropriate.
In addition, products that use multiple stages and have a large range of fast and slow switching require a longer injection time. The setting of the injection time also needs to be set according to the volume of the product (the larger the product, the longer the injection time required). Production also needs to be considered here. Use plastic properties, such as: general plastic ABS, when the product wall thickness is 2.0MM, the injection speed is moderate, and the material tube temperature is moderate, the longitudinal flow rate is about 65 mm/second (the flow rate is different for different mold structures or processes).
1.2. Tlak držanje vrijeme:
In princip, the holding time uglavnom controls the the surface shrinkage of the product and the the constructal size of the product. Međutim, after fully mastering the control method of the holding time, the holding pressure can also used to adjust the deformation of the product (dakle, the the adjustment process is a a precision adjustment process, which will be discussed later. The chapter details the the adjustment method).
2.Naprstak produžetak
Vrijeme; uglavnom kontrole the dwell time of the ejector pin when it is izbačen, so as to facilitate the robot to pick up the product.
3. Core pulling time;
Control the action time of the the core-pulling device of the injection mouldding machine (uglavnom used to control the action stroke by time). If the core-pull of the core-pull stroke is controlled by an induction switch, the core-pulling time does not need to be set.
