Mold clamping device is an important part to protect precision molds and ensure product quality. Compared with the ordinary clamping device, the stiffness of the precision clamping device is 10% ~ 15%, and the parallelism standard between the moving and fixed templates is 30% ~ 40%, which is generally controlled at 0.05 ~ 0.08mm, so as to realize the low-pressure protection of the mold and the accurate control of the clamping force.

1、精密肘杆装置的合模装置

1. Clamping device of precision elbow bar device

对于传统的肘杆装置的合模装置，其动、定模板之间无法获得长期稳定的平行度，同时很难实现对精密模具的低压保护。

For the traditional clamping device of elbow bar device, the long-term stable parallelism between moving and fixed templates can not be obtained, and it is difficult to realize the low-pressure protection of precision molds.

为克服这一缺陷，精密肘杆装置做了以下改进：采用高精度的滚珠导轨副来导向动模板的运行，保证了动模板运行精度的稳定性；应用了具备控制速度和闭环压力的双重功能的伺服阀，实现了对于精密模具的低压保护；销轴和钢套采用了具有高耐磨性的摩擦副，进一步稳定了动、定模板之间的平行度；精密调模机构的应用实现了高精度地调模，从而保证了动模板在任一位置都能达到稳定的平行度。

In order to overcome this defect, the precision elbow bar device has been improved as follows: a high-precision ball guide rail pair is used to guide the operation of the moving formwork to ensure the stability of the operation accuracy of the moving formwork; The servo valve with dual functions of controlling speed and closed-loop pressure is applied to realize the low-pressure protection of precision die; The pin shaft and steel sleeve adopt friction pairs with high wear resistance to further stabilize the parallelism between moving and fixed formwork; The application of precision die adjustment mechanism realizes high-precision die adjustment, so as to ensure that the moving template can achieve stable parallelism at any position.

2、精密全液压合模装置

2. Precision full hydraulic clamping device

精密注塑的合模装置是以全液压合模装置为主。传统的合模装置其肘杆装置的合模力通常作用在上、下(或左、右)两侧，会导致动模板中部发生受力变形，从而影响模板的平行度，而这种全液压合模装置的合模油缸活塞作用于动模板的中央位置，保证了动、定模板之间长期稳定的平行度。

The clamping device of precision injection molding is mainly full hydraulic clamping device. The clamping force of the elbow bar device of the traditional clamping device usually acts on the upper and lower (or left and right) sides, which will cause the stress deformation in the middle of the moving template, thus affecting the parallelism of the template. The clamping cylinder piston of the full hydraulic clamping device acts on the central position of the moving template, ensuring the long-term stable parallelism between the moving and fixed templates.

随着应用要求的提高，精密全液压合模装置也不断进行着改造，动模板运行的导向采用高精度的滚珠导轨副就是一个最明显的进步，使其达到了进一步提高动、定模板之间的平行度稳定性的要求。

With the improvement of application requirements, the precision full hydraulic mold closing device is also constantly reformed. The most obvious progress is that the moving template is guided by the high-precision ball guide rail pair, which makes it meet the requirements of further improving the parallelism and stability between the moving and fixed templates.

3、无拉杆合模装置

3. Non pull rod clamping device

无拉杆合模装置由于不采用拉杆，消除了拉杆挠度对模板平行度的影响。近年来，通过对易受力变形的“C”形架进行改进，提高了动、定模板之间平行度的精度及精度稳定性。比如，米拉克龙的Freedom系列无拉杆注塑机其合模装置呈U型结构，且仅有底下两根拉杆，具有更高的刚性。通过配置专利的平衡油缸结构，使得定模板之间的平行度更稳定。

Because the pull rod is not used in the pull rod clamping device, the influence of the pull rod deflection on the parallelism of the formwork is eliminated. In recent years, the accuracy and accuracy stability of parallelism between moving and fixed formwork have been improved by improving the "C" frame which is easy to bear force and deformation. For example, miracron's freedom series pull rod free injection molding machine has a U-shaped clamping device with only two lower pull rods, which has higher rigidity. By configuring the patented balance oil cylinder structure, the parallelism between fixed templates is more stable.

4、分块连体头板

4. Block connected head plate

一般，有拉杆的合模装置注塑机其头板都是采用整块式结构，而这样的结构设计往往会由于头板受力过大而导致整体变形。精密注塑机通过采用分块连体头板，有效提高了头板的刚度，从而达到减小模板因受力而对模具产生的变形挠度。这种分块连体头板将头板的受力功能和安装模具功能分开，分别由各自的块体承担，并用中心圆环体连接受力块与安装模具块。在承受合模力的过程中，由于中心圆环体的受力面积小于受力块面积，头板受力产生的挠度,仅将中央中心圆环体处所产生的变形挠度传递给安装模具块，由此可以看出,安装模具块因受力而产生的变形挠度区仅在中央中心圆环体，不会对安装模具块整体产生挠度，从而达到提高锁模精度的目的。

Generally, the head plate of injection molding machine with pull rod clamping device adopts the whole block structure, and such structural design often leads to overall deformation due to excessive force on the head plate. The precision injection molding machine effectively improves the stiffness of the head plate by using the block connected head plate, so as to reduce the deformation and deflection of the formwork to the mold due to stress. The block connected head plate separates the stress function of the head plate from the function of installing the die, which is respectively borne by their respective blocks, and the central ring is used to connect the stress block and the installing die block. In the process of bearing the clamping force, since the stress area of the central ring is less than the area of the stress block, the deflection generated by the stress of the head plate only transmits the deformation deflection generated at the central ring to the installation die block. It can be seen that the deformation deflection area of the installation die block due to the stress is only in the central ring and will not produce deflection on the whole of the installation die block, So as to improve the mold locking accuracy.

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