Fig. 1. The integrated algorithm of operation of the information retrieval system of the cutting tool

When all basic data in the form of the file are entered into the program module, process of search by results of which information on the found mill – the link to its location in ISS RI and the sketch is output is carried out. At computer modeling the planes of axial section (fig. 2 are received mill model in an isometry (fig. 2 and). б) and family of curves with bending around (fig. 2 в) 
The pilot batch of conic trailer mills with screw shaving is made flute.

. 
а)                                                                               б)                                                                                  в)

Results of measurements showed that the disk mill chosen by means of the INFORMATION RETRIEVAL SYSTEM as RI processes screw shaving a flute in the set limits.

Projects of state standards in which there are TPM intended for application in spheres of distribution of the state metrological control and supervision have to be exposed to metrological examination in the state scientific and metrological centers Rostechregulation.

Documents on MVI which aren’t used in spheres of distribution of the state metrological control and supervision subject to metrological examination in the order established in branch or at the enterprise.

It is expedient to carry out metrological expertize of materials on development of TPM in the following sequence, to check:

- completeness of the documents submitted for metrological examination; thus can be included in the package of documents:

• initial requirements (specification) on development of TPM;

• the document (draft document) on TPM;

• programs and results of experimental or settlement estimation of characteristics of an error of measurements;

• the report on results of research at a development stage or approbations of TPM;

• other documents of development and research MVI (for example, the software when using computer facilities).

Analyze sufficiency and completeness of the basic data necessary for development of TPM and for estimation of characteristics of errors of measurements which will be attributed by TPM. Basic data are provided in GOST P 8.563-96, including:

- purpose of TPM (a scope, the name of the measured size, limits of measurements, characteristics of the measured size, characteristics of object of measurements if they can influence an error of measurements, etc.);

- requirements to an error of measurements; In the absence of requirements in an explicit form they should be established, proceeding from requirements to reliability of control or an error of tests. Often in practice use a ratio between blundered measurements and tolerance zone border;

- conditions of measurements (temperature, humidity, pressure, other factors of influence). Conditions of measurements can be set in the form of nominal rates and (or) borders of ranges of possible values of the influencing sizes;

- requirements to automation of measuring procedures;

- requirements to safety of performance of work;

- other requirements according to specifics of TPM.

Analyze standard documentation on which references in materials to TPM are given, check, whether expired the term of their action, reveal not specified normative documents.

Check correctness of metrological terminology (according to RMG 29-99 and other standards establishing terms and definitions in concrete areas of measurements) and correctness of names and designations of sizes and their units (according to requirements of GOST 8. 417-2003).

Estimate correctness of a choice of measuring instruments and a choice (development) of a method of measurements. In a number of technical documentation recommendations about application of concrete measuring instruments are provided. Analyze completeness of the accounting of all factors influencing an error of performance of measurements; estimate validity of the assumptions accepted when developing TPM.

Analyze and estimate completeness of identification and the accounting of components of an error of measurements (typical sources and the making errors of measurements are given in appendix A by GOST P 8.563-96).

Analyze a choice of a way of estimation of characteristics of the making errors and a way of their summation. At research use the following procedures of estimation of errors of measurements: settlement, experimental or settlement and experimental. Analyze and estimate completeness and validity of procedure of preparation and performance of measurements.

Establish expediency and possibility of increase of accuracy of measurements on the analyzed TPM.

Establish possibility of control of accuracy of measurements and analyze procedure of such control.

At metrological examination of the documents regulating TPM it is necessary:

- to establish, whether this TPM belongs to spheres of distribution of GMN (Art. 13 of the Act of the Russian Federation “About ensuring unity of measurements” the version of 1993);

- to establish compliance of a technique of performance of measurements to requirements of GOST P 8.563-96.

Thus it is analyzed:

• name TPM correctness;

• existence of all necessary sections and correctness of their name;

• completeness and correctness of a statement of all sections.

- to establish existence (or absence) numerical characteristics of errors of measurements;

- to estimate validity of the attributed characteristics of an error of measurements;

- to check implementation of requirements regarding conditions of measurements;

- to establish observance of the requirements to measuring instruments used when performing measurements;

- to estimate validity and correctness of a choice of measuring instruments on accuracy;

- to check completeness and correctness of a statement of requirements to auxiliary devices, standard samples, the certified mixes, reactants;

- to check completeness and correctness of a statement of algorithm of preparation and performance of measurements;

- to estimate possibility of control of accuracy of results of the measurements received when using this TPM;

- to check completeness and correctness of a statement of requirements for safety measures and environmental protection;

- to check compliance of the applied terms and designations of sizes and their units to requirements of standard documentation.

The purpose of metrological examination of drawings is verification of the necessary means and data sufficient for control of the sizes, maximum deviations, etc. parameters and requirements, and also an assessment of their suitability for control.

Metrological examination is recommended to subject assembly, assembly, outline drawings, and also drawings of separate details.

It is expedient to carry out metrological expertize of the drawing of a detail in the following sequence:

- in the presence on the drawing of text records of norms of accuracy check correctness of terminology. At detection of terminological mistakes it is necessary to understand the valid sense of qualifying standards. In some cases carrying out metrological examination before receiving the corresponding explanations from the developer is inexpedient;

- reveal the sizes limited to admissions, establish need and possibility of their control;

- check mutual coordination of admissions of the sizes, forms and arrangements;

- estimate mutual coordination of admissions and requirements to a surface roughness;

- check possibility of control of admissions of a form and a relative positioning of surfaces.

It is necessary to distinguish metrological examination and metrological control. In control, generally check correctness of metrological terms, names and designations of physical quantities and their units.

Metrological examination comes to an end with recommendations about improvement of metrological providing. Considering that each documentation has a developer (the owner of documentation), it responsible for results of introduction of the project, he has the right to adopt or not to accept suggestions for improvement of metrological providing by results of metrological examination. Therefore, proposals of experts in metrological examination have advisory nature. As for remarks by results of metrological control, entering into drawings of the corresponding adjustments is obligatory, since this elimination of the made mistakes.

Now the domestic enterprises are developed actively and introduced quality management system. Metrological examination in our country was created for increase of a level of quality of production. Modern approach to quality sets a task not of control, and ensuring quality and not only production, it is solved the new concept – TQM (the general management by criteria of quality). Besides, firms, in addition to the created systems of quality management, develop specialized methodologies of improvement and ensuring quality. In these conditions metrological examination, it is possible to tell, receives a second wind and gets new functions and opportunities. Only creative approach to further improvement of metrological examination is capable to bring new decisions on additional improvement of quality of production of the enterprises of machine-building branch.

Keywords: A compression mold, thermal stability, thermal stability coefficient, molding under pressure.

At design of industrial equipment for molding under pressure of color alloys it is necessary to consider such factors as: properties of the filled-in alloy, a design of castings, type and nature of operation of the equipment and equipment. According to authors of this article, property of the filled-in alloy more influence a final design of a compression mold as they determine the final sizes of details of equipment, and also material of which they will be made, the technological modes of process of molding, etc.
As, now to 50% of preparations of the details received by method of the molding under pressure (MUP) are made of zinc alloys [1], it is necessary to focus the attention on studying of these alloys.
As the reasons good foundry properties of zinc alloys, low temperatures of filling in a casting mold of 380-480 °C, depending on structure of an alloy, and also possibility of drawing various coverings on a surface of the received castings for this purpose serve.
The specified advantages of zinc alloys in the conditions of market economy create serious prerequisites for expansion of application of this technology in the conditions of a mass and large-lot production. However it is interfered by lack of reliable techniques of forecasting of an operational resource of compression molds.

From the theoretical point of view work [2] in which the experimental and settlement technique of an assessment of operational firmness of compression molds is described is important.
In this work the term of operation of a compression mold is broken into 2 periods: the first – before emergence of the first cracks, the second – growth of cracks to the critical sizes or until destruction. Duration of the first period is eventually based on definition of power criterion

where - - the temperature tension operating on compression mold metal in the field of plastic deformations
 - material fluidity limit.
Depending on numerical value of this criterion is defined, what nature of damage. In a case  there is a thermofatigue damage, at quasistatic damage, if addition  of thermofatigue and quasistatic damages is possible. Power criteria gives the chance rather precisely to estimate dependence of behavior of material of a compression mold on tension perceived by it.
For thermofatigue damage:
 
(1) 

For quasistatic damage:
 (2)

For the mixed damage:
 (3)

In these formulas - the size of relative irreversible plastic deformation for a cycle, - the size of the relative saved-up deformation for a cycle, - limit plasticity of material at a temperature for a cycle, m – a curve inclination tangent temperature deformation for the considered material.

Calculation of the period of development of cracks to the critical sizes is carried out on a formula:

where - the current dimensionless measure of damages, 
 - the coefficient considering crack growth rate on i-ohm a loading step
m – curve inclination coefficient “temperature deformation”,
 - the provided coefficient of asymmetry of a cycle on i-ohm a loading step,
i – loading step,
- crack depth for each step of loading.
Thus, operational firmness will be defined by expression

where - quantity of cycles before emergence of the first cracks,
- quantity of cycles before emergence of the critical sizes of cracks.
This calculation procedure with small to deviations was confirmed by practical values. However, its application when using zinc alloys is impossible for the following reasons: calculation of the first period before emergence of the first cracks is made at low-cyclic loading, the second period of growth of cracks to the critical sizes is defined on the basis of the experimental data obtained when using aluminum alloys.
ccording to authors of this work, the provided information allows to draw an unambiguous conclusion on relevance of the problem which is taken out in the name, and also an urgent need of carrying out the theoretical and experimental researches directed on its permission.
In work [1] as the factor influencing thermal stability thermal deformation, i.e. smyaty form-building surfaces of compression molds is considered. At operation these deformations a smyatiya are summarized that leads to emergence of gaps between butt surfaces of compression molds and as a result, to education облоя on the cast products. 
Within a known technique of I.I. Goryunov as criterion of an assessment of thermal stability of materials the compression mold material embrittlement coefficient for one cycle [1] is offered. The physical sense of this coefficient is that when cycling margin of safety and plasticity of metal of a compression mold goes down depending on properties of material and thermal tension. For a case when the maximum temperature tension less strength the formula of calculation of thermal stability has the following appearance:
 (4)
where – thermal stability coefficient which depends on purity of a working surface of a compression mold, sensitivity of material to concentrators of tension, sharpness of cuts (concentrators), weight and amount of castings, etc.
 - temperature tension;
 – general thermal deformation;
- strength of material of a compression mold.
However the data provided in the same source for steel 3Х2В8Ф show that the removed formula doesn’t give the chance rather precisely to predict firmness of a compression mold for LPD of zinc alloys.
According to researches of authors of this work, concentrators of tension and purity of working surfaces of matrixes as these factors define nature of interaction of a stream of the melted metal with compression mold material have the greatest impact on coefficient of thermal stability. 
This statement is basic for a new, advanced technique of forecasting of an operational resource of compression molds of LPD of zinc alloys which key moment is determination of value of coefficient of thermal stability, depending on specific conditions of molding.
Determination of coefficient of thermal stability allows to predict precisely and adequately the size of an operational resource of a compression mold. 
It, in turn, gives the chance to develop practical recommendations about a choice of a design and material of compression molds for molding under pressure of zinc alloys for increase of operational firmness of the most loaded details of industrial equipment.