[Scene definition] How to define performance and warranty boundaries in a screw procurement contract is to start from the real volume scene of the plant and not just the diameter or price of the screw. It is recommended that the drawings version, documentation, size reports, turn-overs and services be organized first, followed by three consecutive shifts to avoid a single test model representing the production status. The aim of this step is to establish comparable old programme benchmarks so that subsequent screw changes can be supported by data.

The most easily overlooked aspects of the topic are needs deviations, creation deviations and acceptance disputes. Plants should first identify acceptable ceilings for quality defects, then discuss speed and energy consumption targets, and place red lines for quality and equipment loads at the same time for key products. Vendors can make retroactive trade-offs between interoperability, earmarking and cost when there are clear values for product weight, daily production, customer quality caps and allowed stop times.

The main line of the case [design focus] is the management of the supply chain with uniform data packages and performance acceptance standards. In geometry and materials programmes, the matrix, alloy layer and surface treatment should be selected on the basis of grinding, corrosive and heat loads; and the measurement segment should be synchronized with the required back pressure, without excessive back pressure. The final solution would also need to be compatible with the wear and tear of the cylinder, the drive, the physical velocity and the current cleaning process, and would not cover up co-operation or process problems with a single high-level material.

The new [comparison validation] programme proposes to operate for at least 24 consecutive hours, with a 30-mode extraction for each stabilization phase, recording the replacement time, the amount of excess waste and the first eligible time. The test should be conducted using a uniform code to avoid different names for the same phenomenon in different shifts, as well as a test to check the acoustic, friction and metal powder immediately after delivery and to identify co-ordinated risks in a timely manner. If only the first one is checked, it is easy to miss the risks associated with heat drifting, material stoppage, reversal loop return and prolonged wear and tear.

When the [stabilized production] spiral is shaped, a single asset-numbered associated drawing, repair, up and down is used to record, and trend maps are created for the perforation, the reverse ring gap and the inside of the cylinder. The time of storage, back pressure, screw velocity, noise and mass of the product shall be recorded in a uniform manner in the shift. When the above indicators change at the same time, the mechanical gaps and the state of the raw materials should be checked before the process is adjusted to avoid the use of parameters to compensate for hardware degradation.

The cost statement [comprehensive cost] could not simply be a screw price, with a minimum production threshold set for a dedicated screw, re-comparisonation of the generic formula when production is insufficient, and classification of the cost of passenger litigation, refunds and additional overhauls as loss of quality, not just by counting the scraps on the aircraft. It is recommended that the cost per 10,000 eligible items be exported simultaneously, the cost per 1,000 operating hours and the estimated number of return months. When new programmes reduce waste, refuelling or sudden shutdowns, higher initial inputs are often offset during production.

The [Closed Ring Management] will eventually include drawing numbers, screwdriver materials, heat treatment, critical dimensions, portable tubes, process windows and acceptance data in the curriculum vitae cards. It is recommended that stratums by batch of raw materials be used to prevent the miscalculation of formula fluctuations as a matter of equipment, and that a system of metallic heterogeneity separation and magnetic insulation be established, and that pry damage be examined after the anomaly. The applicable boundary “how to define performance and secure the boundary in a screw procurement contract” should be reassessed, rather than defaulting on the permanent validity of the old conclusion, when there is a significant change in the feedstock formulation, retrospective ratio, product structure or target node.

Topic: Procurement, acceptance and vendor management