The technical solution analysis is based on the above analysis, using the “BS†(brainstorming) method in the value engineering to design and compare the schemes. After the summary and preliminary evaluation, three transformation schemes are obtained, as shown. The trimmer modification plan content is expected to be fully modified after the investment transformation day program features: the grinding wheel frame feed is changed into numerical control; the original dressing device is completely removed, the main motor drive, the oil cylinder swings slightly, and the overall adjustment of the spiral angle.
Semi-automatic dresser: use the original part of the function, manually feed the grinding wheel; use the oil cylinder to swing the lifting diamond wheel, and swing at a small angle when trimming. Please design and develop the original machine tool factory according to the B plan. The structure is simple, the maintenance is convenient, and the transformation time is short. The investment is based on the value engineering principle to evaluate the three schemes A, B and C. The basic procedure for selecting the best scheme is to use the DARE method to find the weighting coefficient Wi of each evaluation project. .
When using value engineering to select the best solution, we must first select some evaluation indicators that have an impact on the implementation effect of the program to judge the pros and cons of the program. Secondly, the importance degree of each evaluation index is determined, and then the importance coefficient of each evaluation index, that is, the weighting coefficient is determined. Here, according to the importance degree of the realization function, six evaluation indicators such as function realization degree, dressing effect, scrap rate, transformation cost, maintenance cost and transformation period are selected to select the scheme.
The loop multiple is determined: the loop multiple is the basis for determining the weighting coefficient of each evaluation item, that is, the important step of value engineering function analysis. The determination of the multiple of the ring is mainly based on professional technology and practical experience, but in order to reduce the deviation, the personnel required to participate in the evaluation must have a certain level of professional skills, and the number should not be too small. The project hired 6 technicians from the electromechanical department of the factory to score the above indicators, and listed the order of each evaluation index according to the importance degree of the realization function, and then determined the chain multiple of each evaluation index.
Taking the importance of maintenance cost as one unit, the importance of the transformation cost is twice the maintenance cost, and the ratio of the transformation cost is 2 points. The others are similarly analogized, and the ratio of the multiples of each evaluation index is obtained. Evaluation project function realization degree trimming effect scrap rate transformation cost maintenance cost modification cycle ring ratio multiple importance value weighting coefficient 14. Determination of importance value: Let the last evaluation index, that is, the importance value of the transformation cycle is 1, according to each indicator The relationship between the multiples of the loop and the importance value of each evaluation index is calculated.
Others are analogous to analogy, and thus the importance values ​​of the respective evaluation indicators are obtained. Determination of the weighting coefficient: Accumulate the importance value of each evaluation index, and then divide the importance value of each evaluation index by the cumulative total score, that is, 14.58, and obtain their weighting coefficients. For example, the weighting factor of the maintenance cost is 1.2/14.
The satisfaction degree coefficient si of each scheme is obtained. Each program evaluates the project satisfaction degree coefficient project evaluation evaluation program tentative satisfaction degree coefficient correction satisfaction degree coefficient solution satisfaction degree coefficient end. The method for determining the degree of satisfaction coefficient si of each scheme is the same as the method for determining the weighting coefficient, and will not be described.
Find the total evaluation value Ai of the scheme, where Ai=WiSi. From the display, the evaluation value of the B scheme is the highest with the highest value of A=0.4, using the semi-automatic dresser, using the original part of the function, manually feeding the grinding wheel; The roller, small angle swing when trimming, is the best solution. After the multi-party demonstration, the best solution was manufactured, installed and tested through paper for three months. The equipment was rebuilt to achieve the expected goals.
Technical solution evaluation This technical transformation, using the principle of value engineering, with functional analysis as the core, found out the commonality and individuality before and after the transformation. Technically, the original similar functional components are utilized as much as possible. Due to the high precision and easy retention of the diamond roller, the surface quality of the workpiece is obviously improved, and the waste caused by the inaccurate cutting is completely eliminated, and the scrap rate is reduced from 15% to 2%. In addition, the operation is simple, no need to repeatedly adjust, shortening the dressing time, and improving the production efficiency.
(Finish)
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