How to improve machining productivity?

by xiaolong luo cnc machining shop

Labor productivity refers to the quantity of qualified products manufactured by a worker per unit time or the time it takes to manufacture a single product. Improving productivity is a comprehensive issue. For example, improving product structure design, improving blank manufacturing quality, improving machining methods, improving production organization and labor management systems, etc. As far as technological measures are taken, there are several aspects:

First, shorten the unit time quota

Time quota refers to the time required to complete a process under certain production conditions. The time quota is an important part of the process specification, and is an important basis for arranging the operation plan, performing cost accounting, determining the number of equipment, staffing, and planning the production area. Therefore, the reasonable establishment of time quotas is very important to ensure product quality, improve labor productivity, and reduce production costs.

Second, the process unit quota includes part

1.Basic time

The time consumed by a process that directly changes the size, shape, relative position, surface state, or material properties of a production object. For laser cutting, the basic time is the manoeuvring time to cut the metal.

2.Auxiliary time

Time consumed by various auxiliary actions that must be performed in order to achieve the process. This includes loading and unloading workpieces, starting and stopping machine tools, changing cutting rates, measuring workpiece dimensions, and feeding and retracting operations.

There are two ways to determine the auxiliary time:

(1) In mass production, the auxiliary actions are decomposed, the time consumed is determined, and then accumulated;

(2) In small and medium batch production, it can be estimated according to the percentage of basic time, and it can be modified and reasonable in actual operation.

The sum of basic time and auxiliary time is called operation time, also called process time.

3. Arrange work time

That is, the time consumed by a worker to take care of the work place (such as changing tools, adjusting and lubricating machine tools, cleaning chips, and cleaning tools, etc.), also known as service time. Generally calculated based on 2% to 7% of the operating time.

4. Rest and nature take time

That is, the time workers spend in working shifts to restore physical strength and meet natural needs. Generally calculated as 2% of operating time.

5. Preparation and end time

That is, the time it takes a worker to prepare and finish a job in order to produce a batch of products and parts. Including familiar with drawings and process documents, receiving rough materials, installing process equipment, adjusting machine tools, delivering inspections, sending finished products, returning process equipment, etc.

In addition, the use of various quick-change tools, tool fine-tuning devices, special tool setting templates, automatic tool change devices, improving the service life of tools, regular arrangement and placement of tools, fixtures, measuring tools, etc., can reduce the time and space of the layout work. Service time has practical significance for improving labor productivity.

 The use of advanced cnc machining equipment (such as CNC machine tools, machining centers, etc.) to gradually realize machining and measurement automation is also an inevitable trend to improve labor productivity.

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Created on Jan 12th 2020 21:21. Viewed 307 times.

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