Automotive bumper mould
The ten years that we have been in the plastic bumper mould industry as a custom mold manufacturer, we also have the privilege to provide plastic molds to clients around the globe, which are of the highest quality and delivered with superior service.
In order to provide the best possible quality in custom Automotive bumper mould, Topworks focuses on designing and manufacturing molds with the latest technology.
Throughout our ten years of business, Topworks has contributed significant knowledge and expertise to the plastic injection mold industry that allows us to offer our customers the highest level of skills, knowledge, and dedication you can find in the manufacture of original Automotive bumper mould.
It is a fact that Topworks has the capability to manufacture a complete set of Automotive bumper mould in an efficient and timely manner, and they also have the capability to customize the assembly and custom machining of each bucket to suit the customer’s specific needs.
As a result of our highly skilled employees, each of whom possesses a specific expertise,for Automotive bumper mould, we are comfortable fulfilling your plastic mould requirements regardless of how complicated the designs are.
We develop prototypes and production Automotive bumper mould in-house, and since we can deliver a multitude of your requirements, your products will be completed within our building.
We could supply different kinds of the bumper mould with P20 and 2738 steel ,especially for the hot-runner (sequence timer control)and runner-less car bumper mould.
Runner-less or Hot-Runner of Bumper Mould
When the plastic melt is thermally stable, it is possible to completely eliminate the need to regrind runners by using runnerless molds. One common type is the hot runner mold. In this bumper mould, the plastic is injected into an insulated runner plate that is kept slightly above melt temperature by a separate set of electric cartridge heaters and then through the runner channels and insulated nozzles into each cavity . In effect, this is a runnerless operation since there is no runner regrind. The hot runner plate is thermally insulated by an air gap.
Hot-runner car bumper moulds have numerous advantages as a consequence of elimination of sprue and runner regrind. There is no material loss or contamination from regrinding and no extra cost in blending regrind with virgin resin for automotive company. There is no degradation of polymer, especially in optical and electrical properties, due to regrind usage. No energy is wasted in regrinding or in melting and cooling regrind. There is an effective increase in shot capacity and reduction in required mold-opening stroke. Cold runners have a tendency to catch on other mold parts during ejection, and this problem is eliminated. The bumper mould fills faster and balanced flow to the cavities is more readily accomplished.
To control drool and yet prevent freezing, hydraulically operated gate valves or valve gate systems have been developed . Valve gates are compact hydraulic cylinder/valve pin assemblies for positive individual gate shutoff. At a preset time, the hydraulic cylinders retract at each gate, permitting melt flow. Secondary timers set the positive closure of each valve to occur after optimum preset fill time has expired. This eliminates overpacking or underfilling at each gate.
The system manifold and nozzles are temperature controlled to prevent thermal degradation of the melt. This complex system helps control cavity filling and end bumper product properties, especially for large, multigated parts and family moulds. Family moulds make different parts for a common assembly, and inherently have unbalanced flow.
Valve gate systems can be adjusted by tool maker to compensate for unbalanced flow and to run with minimum rejects in these situations. This is vital where regrind is not allowed because of rigid product specifications, such as in medical or optical products.
A simple alternative to heated hot-runner bumper moulds is to provide sufficient thermal insulation in the runner plate to keep the plastic from freezing. In an insulated runner mold a low thermal conductivity plastic skin, formed toward the end of injection next to the surface of the runner walls, insulates the bulk of the plastic flowing through the channel.
The diameter of the runner is about twice that for a cold-runner system. One disadvantage is that machine stoppage for 15 s or more may result in runner freezing, requiring partial disassembly of the mold to remove the runner.
Runnerless bumper molds from mold manufacturer have become popular for long production runs where extra mold cost and setup time can be absorbed by bumper mold maker . Valve gate systems are susceptible to contaminants in the melt stream that can clog nozzle valves. The three-plate mold is an alternative when simplicity and lower cost are important, and where runner regrind is not excessively costly.