How to compress the wheel hub mold changeover time to within 2 hours

How to compress the wheel hub mold changeover time to within 2 hours
The replacement time of wheel hub molds has been reduced from the common industry standard of 3 hours to less than 2 hours, relying on standardized interfaces, quick change clamping, and preparation work before replacement.
First, calculate where the changeover time is spent
A complete changeover includes six steps: demoulding, cleaning, mold installation, takeover, machine adjustment, and first piece confirmation. Disassembly and assembly usually account for 55% -65%.
Takeover and adjustment account for 20% -25%, and first piece confirmation accounts for 10% -15%. The focus of optimization should be on disassembly and assembly, rather than repeatedly compressing the machine adjustment time.
Calculated based on a three shift system with one type change per day, each time saves one hour, resulting in an additional 300 hours of effective production time per year.
Standardized interfaces are a prerequisite
Standardize the positioning method of the mold to use positioning pins and flanges of the same specifications, so that there is no need to readjust when changing the mold. The alignment process usually takes 30-50 minutes.
After interface standardization, the height of the mold should also be standardized. The height difference should be controlled within ± 5mm, and the same set of pads can be used to save time on adjusting the pads.
Xinfeng Mold will make interface parameters into drawing attachments for the wheel hub mold project, and customers can directly use them for future mold purchases without the need for repeated adaptation.
The value of quick change clamping device
Traditional bolt pressing plates require the disassembly and assembly of 16-24 bolts per set of molds, which takes 40-60 minutes. Hydraulic or mechanical quick change clamping can be pressed for less than 10 minutes.
The investment for a single set of quick change equipment is about 30000 to 80000 yuan. Calculated based on 200 model changes per year and saving 40 minutes each time, the payback period is usually within 1 year.
The clamping force needs to be verified. The clamping force of the quick change device should not be lower than 80% of the original bolt scheme, otherwise there is a risk of loosening on large tonnage machines.
The takeover process is most prone to errors
The number of interfaces for water, gas, and temperature measurement lines often reaches 20-40. Connect and confirm one by one, taking 20-30 minutes.
By using an integrated connector board, multiple waterways can be centralized into one quick plug panel, reducing the docking time to less than 5 minutes.
The interface needs to be designed to prevent errors. Different circuit joint diameters or colors should be distinguished to avoid local cooling failure caused by reverse connection.
Preparation before changeover determines on-site efficiency
Mold preheating should be completed before going online. Heating the mold to above 200 ℃ using an offline preheating furnace can save 1-2 hours of on-site preheating.
Prepare the tooling, lifting equipment, and spare parts in advance and place them next to the changeover station. If one tool is missing, the replacement will be interrupted.
The instruction manual for changeover should be visualized. Create a graphic board with steps, torque, and takeover numbers so that new employees can follow the instructions.
Compression space in the adjustment process
Establish a wheel profile parameter library and archive the pressure, temperature, and time parameters of mature wheel profiles. When changing the model, it can be directly called, and the tuning time can be reduced from 60 minutes to 20 minutes.
The first piece confirmation adopts a rapid inspection tool, and the size and airtightness are checked synchronously. The waiting time for laboratory reports is often an invisible consumption of changeover time.
The adjustment sequence should be fixed as mold temperature, pressure, and time, and should not be cross adjusted. Cross adjustment can cause variables to interfere with each other, which can actually be slower.
Frequently Asked Questions
Is it realistic to switch models within 2 hours?
Answer: Standardized interfaces can accelerate device replacement, but require initial investment.
Q: How much does the quick change device cost?
Answer: A single set costs about 30000 to 80000 yuan, and the payback period is usually within one year.
Q: How much time can offline preheating save?
Answer: It can save 1-2 hours of on-site preheating.
Q: Why is it easy to make mistakes when taking over?
Answer: There are up to 20-40 circuits that require error prevention design.
Question: How long can the adjustment time be reduced?
Answer: When there is a parameter library, it can be compressed for about 20 minutes.
Q: What is the necessary frequency for modification?
Answer: More than once a day results in a shorter recovery period for the renovation.
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