Формы для литья под низким давлением (LPDC)
Формы для гравитационного литья
Формы для литья под противодавлением (CPC)
Structural Parts Casting Mold
Форма для литья ступиц мотоциклетных колес
Форма для литья под давлением ступицы колеса с диф
Форма для литья под действием силы тяжести ступицы
Форма для литья под низким давлением ступицы колес
Design of dimension gauges for LPDC castings, including specialized gauges, on/off gauges, three-dimensional coordinates, and deformation control schemes
Low pressure castings will experience shrinkage and deformation after cooling and heat treatment, and caliper single point measurement cannot determine the assembly contour; Specialized gauges are the core of batch rapid size control. Incorrect selection of gauge benchmarks and unreasonable arrangement of measuring points can cause batch misjudgment and interference during installation.
1、 Quantitative standards for gauge reference, shrinkage, and tolerance allocation
A356 low pressure casting line shrinkage rate: 0.55-0.75%; The upper limit for thick walled shells is 0.70-0.75%, and the lower limit for thin-walled shells is 0.55-0.65%. The pre release shrinkage of the mold processing is corrected according to the measured value, and theoretical values are not directly applied.
Priority should be given to using the casting machining benchmark for the gauge reference, with unified reference holes, reference surfaces, and machining fixtures to avoid errors caused by benchmark conversion.
Gauge tolerance: generally take 1/3 of the product tolerance; The product has a tolerance of ± 0.2mm, and the manufacturing tolerance of the measuring tool is controlled within ± 0.06mm.
Detection components: flat dial gauge, stop pin, profile card, gap gauge; Freeform surfaces, complex cavities, and coordinate sampling.
The Xinfeng Mechanical Inspection Tool Plan synchronously outputs a list of measuring points, distinguishing between key assembly features and non key appearance features, with a focus on controlling sealing surfaces and installation hole positions.
2、 Structure, Material, Inspection and Maintenance of Inspection Tools
Inspection tool body: aluminum substrate+hard anodizing, or 45 steel quenching; The measurement insert is made of Cr12MoV, which is wear-resistant and has a hardness of HRC58-62.
The positioning pin consists of a fixed reference pin and a floating compensation pin, which releases the stress of free deformation of the casting and prevents false deviation caused by forced pressing.
For castings with large deformation during heat treatment, auxiliary clamping points should be added to the gauge to control the clamping force and avoid bending the castings.
Inspection cycle: Calibrate every 2000 molds for mass production; Long term storage, recheck the benchmark before each launch; Replace the worn-out pins or damaged inserts immediately.
Three coordinate sampling frequency: first piece must be inspected, and after batch stabilization, according to AQL; Restoration of full inspection after size fluctuation, mold replacement, and heat treatment furnace.
3、 Differences in Control of Inspection Tools for Overseas Customers
In Southeast Asia, simple cardboards and calipers are commonly used for spot checks, but the accuracy of the measuring tools is low, and out of tolerance parts are repaired and polished on site.
North American Tier 1 gauge drawings, gauge calibration reports, and GRR analysis must be submitted to PPAP, and GRR<10% can be put into mass production.
European customer gauges with data collection, automatic upload of dial gauge readings, SPC monitoring of size trends, and advance prediction of deformation drift.
Large scale bracket castings in the Middle East have loose dimensional tolerances but strict assembly clearance requirements. Inspection tools focus on the coaxiality of assembly contours and installation holes.
4、 Defective size failure chain
The shrinkage rate value is incorrect → insufficient pre placement of the mold → the overall size of the casting is too small, and the hole position and contour are all out of tolerance;
Inconsistent benchmarks, misalignment between gauge benchmarks and machining benchmarks → measurement qualified, interference during machine assembly;
Uncalibrated wear of inspection tool inserts → Batch misjudgment, defective products flow into assembly;
Unsupported heat treatment → uneven deformation, flange warping, hole spacing deviation.
5、 Long tail traffic layout ideas
Low pressure casting gauges, casting shrinkage rate GRR、 Three coordinate detection, aimed at dimensional engineers and quality inspectors.
Keywords: LPDC casting gauge design, shrinkage rate A356 low pressure casting;
Question category: Height R&R requirement for aluminum casting;
Comparison class: custom checking fixture vs CMM inspection for casting.
Suitable for size inspection and tooling inspection special pages.
6、 Common misconceptions in the industry
Misconception 1: The shrinkage rate is uniformly set at 0.7%, and there is a significant difference in shrinkage between thick and thin castings, with thicker walls experiencing greater shrinkage.
Misconception 2: The tighter the gauge, the better. Forcefully pressing the casting to conceal natural deformation can lead to misjudgment.
Misconception 3: Measuring a few holes with a caliper indicates that the size is qualified, and calipers cannot recognize contours and plane warping.
FAQ
Q: What is the shrinkage range of A356 low-pressure casting line?
A:0.55–0.75%。
Q: Recommended tolerances for gauge manufacturing?
A: 1/3 of the product tolerance.
Q: GRR Qualification Standards (North America)?
A:GRR<10%。
Q: How to choose the benchmark for measuring tools?
A: Maintain consistency with machining standards.
Q: Measure the hardness of the insert?
A:HRC58–62, wear-resisting.
Q: What are the key points of inspection tools for heat treated deformed parts?
A: Controllable compression, increase support points.
Q: How long does it take to calibrate the measuring tool?
A: Mass production is calibrated every 2000 molds.
Q: How to detect free-form surfaces?
A: Three coordinate sampling inspection.
Формы для литья под низким давлением (LPDC)
Формы для гравитационного литья
Формы для литья под противодавлением (CPC)
Формы для литья конструкционных деталей
Форма для литья ступицы колеса мотоцикла
Форма для литья ступицы колеса под дифференциальным давлением
Форма для гравитационного литья ступицы колеса
Форма для литья ступицы колеса под низким давлением
ФОРМЫ ДЛЯ АВТОМОБИЛЬНЫХ КОЛЕС
КОНСТРУКЦИОННЫЕ ДЕТАЛИ ДЛЯ АВТОМОБИЛЕЙ
ДРУГИЕ АЛЮМИНИЕВЫЕ ЛИТНЫЕ ДЕТАЛИ
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