相对于需要高速护坡模具的施工方来讲,许多的施工方承包的道路建设都需要数量非常庞大的高速护坡,但是并非每条道路需求的高速护坡尺寸都会一样,有许多的基本就是生产完这条道路所需要的护坡砖之后其模具并没有坏就联系模具厂家进行废料回收,既浪费财力又浪费物力。
Compared to construction companies that require high-speed slope protection molds, many construction companies require a very large number of high-speed slope protection for road construction. However, not every road requires the same size of high-speed slope protection. Many basic methods involve contacting the mold manufacturer for waste recycling after producing the required slope protection bricks for this road, which wastes both financial and material resources.
高速护坡模具设计拉伸模时,为了保证制件的尺寸精度和质量,应注意如下几方面问题:拉深模结构的选择;压料装置的设计设计拉深模时,要合理地选择压料装置;选用合理的出件装置应根据拉伸件的表面质量及尺寸精度不同而采用不同的初件装置,如当制件要求底部较平时,不能采用下漏的刚性推件装置,而必须采用弹性****装置;导向装置的选择,设计拉深模时,通常情况下可以不必采用导向装置,只需在安装时将上、下模对准,调整好上、下模的间隙即可。拉伸工艺计算,拉深模设计时,要对拉伸工艺进行****计算,尤其是多次拉伸的模具,其拉伸次数、各次拉伸的尺寸应满足拉伸变形工艺要求,否则模具设计的再好,也难以拉伸成型。
When designing the drawing die for high-speed slope protection, in order to ensure the dimensional accuracy and quality of the parts, attention should be paid to the following issues: the selection of the drawing die structure; When designing the deep drawing die for the pressing device, it is necessary to choose the pressing device reasonably; The selection of a reasonable output device should be based on the surface quality and dimensional accuracy of the stretched part, and different initial device should be used. For example, when the bottom of the workpiece is required to be relatively flat, a rigid push device with downward leakage cannot be used, and an elastic * * * device must be used; When designing a deep drawing die, it is usually not necessary to use a guiding device. Simply align the upper and lower molds during installation and adjust the gap between them. When calculating the stretching process and designing the deep drawing die, it is necessary to perform * * * * calculations on the stretching process, especially for molds that have been stretched multiple times. The number of stretches and the size of each stretch should meet the requirements of the stretching deformation process. Otherwise, even if the mold is designed well, it is difficult to stretch and form.
高速护坡模具精密注射成型与通用注射成型工艺流程基本相同。精密注射成型的工艺特点是高注射压力、高注射速度、采用多级注射工艺。精密注射成型的注射压力都比较高,并有向超高压力方向发展的趋势,一般为220~250MPa。也可高达400MPa,制品收缩率与注射压力成反比,当注射压力足够高时,制品的收缩率几乎为零。制品收缩率的降低,可有效的提高制品的精度和重复精度,提高注射压力还能有效的提高制品的抗冲击性、****弯曲应力和屈服强度,高注射压力可减少精密制品的壁厚,提高流体的流动长度;提高注射压力,可保证实际注射速率。
The precision injection molding process for high-speed slope protection molds is basically the same as the general injection molding process. The process characteristics of precision injection molding are high injection pressure, high injection speed, and the use of multi-stage injection technology. The injection pressure of precision injection molding is relatively high, and there is a trend towards ultra-high pressure, generally ranging from 220 to 250 MPa. It can also reach up to 400MPa, and the shrinkage rate of the product is inversely proportional to the injection pressure. When the injection pressure is high enough, the shrinkage rate of the product is almost zero. The reduction of product shrinkage rate can effectively improve the accuracy and repeatability of the product. Increasing injection pressure can also effectively improve the impact resistance, bending stress, and yield strength of the product. High injection pressure can reduce the wall thickness of precision products and increase the flow length of fluids; Increasing injection pressure can ensure the actual injection rate.