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) and
maximum 500 mm s
–1
injection speed (injection flowrate
509 cm3
s
–1
) (Fig. 6, Table 2). The necessary injection
thrust of the 36 mm screw is 2.
7 times that of the 22 mm
screw and the maximum pressure is 300 MPa.
The servomotor for the ‘S-2000i100B high speed
injection specification’ was developed with higher torque
than the servomotor installed on the ‘S-2000i100A high
6 ROBOSHOT S-2000i100B high speed injection specificationspeed injection specification’. Although the motor outer
dimension is greater because of the increased rotor size
for higher power, the average torque is achieved in a
slow to fast speed range. Furthermore, the increase in
rotation inertia is reduced to a minimum.
Because the motor power is so large, if a standard
drive mechanism using a pulley and belt is used, the
rotation inertia would be extremely large with the wider
belt and pulley because of the power transition capacity.
Therefore, a mechanism with direct connection of the
servomotor and the ball screw is used in the ‘S-
2000i100B high speed injection specification’.
Furthermore, high precision pressure control, not
influenced by external noise, is achieved by application
of a high precision and high resolution digital load cell.
Figure 7 shows the injection acceleration performance
for light guide panel mouldings using the ‘S-2000i100B
high speed injection specification’. This machine
achieves 15 ms of rapid acceleration, which is superior
to the performance of the ‘S-2000i100A high speed
injection specification’.
Figure 8 shows the injection pressure curve in the
metering process. In this process, the injection servo-
motor and screw rotation servomotor rotate at the same
time. It was confirmed that high precision pressure
control was achieved with ,1 kgf cm–2
variance.
Injection unit driven by linear motor
As mentioned before, to fill thin walled products with
wall thicknesses less than 0.
2 mm, injection speeds over
1000 mm s
–1
are required. The maximum available
injection speed for the injection unit with a combination
of rotary servomotor and ball screw is around
800 mm s
–1
. However, linear motors are known as a
means of attaining high speeds, and Fanuc has devel-
oped and supplied linear motors since 1994.为了以一个精确和稳定的方式生产薄壁制品，FANUC已经开发了电动式注塑机，由旋转或直线电机驱动，以满足产品成型所需特定功能，如很薄的壁厚或特殊形状的塑料材料。在本文中，每种注射单元的必要特征和许多模具的实例一起被介绍。论文网
关键词：高速，壁薄，伺服电机，直线电机，精度控制
介绍
由于信息产业的不断发展，对于小、轻、超精密产品的需求量也在增加。在塑料成型行业，更薄或更高精度的产品继续发展，这一趋势也愈发显著。
典型的塑料制品包括微小的存储器芯片的把手，或手机或数码相机电池箱。为了生产这样薄的模具制品，模具的一个总的技术组合——材料和注塑机的技术——是必需的。
尤其对注塑机而言，一个将熔融材料以一个很短的时间高速和高加速度的充满型腔是必需的。