Time quota
The time quota (working hours quota) refers to the working time and preparation required to complete a qualified product in accordance with the product process in a certain technical state and production organization mode The sum of time, rest time, and physiological time.
The time quota is composed of basic time (Tj), auxiliary time (Tf), time to arrange work (Tw), time to rest and physiological needs (Tx), and preparation and termination time (Tz).
(1) Basic time Tj: The time consumed by the process of directly changing the size, shape, relative position and surface state of the production object is called the basic time. For machining, the basic time is the time it takes to cut the metal.
(2) Auxiliary time Tf: The time consumed by various auxiliary actions, called auxiliary time. Mainly refers to the time consumed by actions such as loading and unloading workpieces, starting and stopping the machine, changing the cutting amount, measuring the size of the workpiece, and moving in and out of the tool. It can be confirmed by checking the table.
(3) Operating time: Operating time=basic time Tj+auxiliary time Tf
(4) Service time Tw (time to place work): Time consumed for normal operation service , Called service time. Mainly refers to the time consumed for changing tools, trimming tools, lubricating machine tools, cleaning chips, and tidying up tools. Calculation method: Generally, the calculation is based on 2% to 7% of the operating time.
(5) Rest time Tx: The time consumed for restoring physical strength and meeting the needs of physiological hygiene, which is the rest time. Calculation method: Generally, it is calculated as 2% of the operating time.
(6) Preparation and finalization time Tz: The time spent preparing and finalizing the production of a batch of parts is called the preparation and finalization time. Mainly refers to the time consumed by familiarizing with process documents, receiving blanks, installing fixtures, adjusting machine tools, disassembling fixtures, etc. Calculation method: Estimate based on experience.
Time quota standard
The time quota standard is stipulated according to the various components of the time quota. It includes: basic time standard, auxiliary time standard, time standard for taking care of work place, rest And physiological needs time standards, preparation and end time standards.
Time quota standards can be divided into equipment time quota standards and typical quota standards.
The equipment time quota standard is divided according to the type of work. Common machining includes turning, milling machine, planer, grinder, electrical machining, CNC machining, etc.
Time quota step-by-step method
Time quota step-by-step method, its theoretical basis is that the process processing consists of many steps, and the process time quota can be composed of the step time quota.