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PROFESSIONAL ADVICE PROFESSIONAL ADVICE

of work and, ultimately, affects even Discrepancies identified In the work of the technical Resolved Discrepancies
the wallet thickness of operators and service Using CAE to Improve
repairmen. TPM TPM TPM
The benefits of using the card 3 card 2 card 1 Honing Efficiency
Kanban method were obvious to us! TPM
If earlier all the tasks fell into one card 4 In the practice of leading
dark boiler of the technical service industrial enterprises, tools are widely
with at least a delay of one day, and
the inclusion of inconsistencies in the For example, after elimination of inconsistency used design automation. Modern
CAD -CAE -CAM systems allow you
work plan depended solely on the No. 2, technical service specialists have the
charisma of the shift supervisor, now opportunity to take on a new problem - inconsistency to organize an end-to-end production
process from the design development
transparency of the process was put No. 3. Each company employee can determine the stage to the release of the product.
at the forefront. overall dynamics at any time identification and CAEs are commonly used in design and are therefore more familiar to the designer. Meanwhile,
Using this approach has created elimination of inconsistencies in production, as well the use of these tools for the analysis of the technological process opens up new possibilities
an effective communication between as the nature of malfunctions. for making effective decisions in technology. This article discusses the capabilities of CAE in
production and technical service. The an application to the study of the process of forming the accuracy of shape and size when
simplicity of the method ensured staff honing the liner of an internal combustion engine and the errors arising from its heating and
involvement. Now the elimination of Discrepancies identified In the work of the technical Resolved Discrepancies temperature deformations during processing.
service
discrepancies is carried out on the TPM TPM
basis of priority, taking into account card 3 card 1 heats up and changes its geometry, which leads
the availability of free human and TPM TPM The geometric errors of the liner to a processing error. In this case, the size error is
material resources - the principle card 4 card 2 are regulated by GOST R 53809-2010 proportional to the change in the temperature of the
of drawing out and a continuous and, depending on the type of engine workpiece, and the shape error is proportional to
flow of repairs, maintenance was and the size of the liner, they are: for the uneven heating of the workpiece. Modern CAE
implemented. All identified problems Fig. 1. Stand and kanban cards.. the internal diameter of 0.03 ... 0.06 systems - computer-aided engineering analysis tools
in the operation of the equipment are recorded, eliminated and visually accessible to any mm, for the profile of the longitudinal
employee of the enterprise. Spare parts supply planning has become an objective process, the section and the non-circularity of the - allow you to analyze the occurring temperature
cost of purchasing unused spare parts, components and assemblies has been reduced. internal diameter, the tolerance is 0.01 deformations in conditions of complex heating and
cooling of the object of study.
Three months later, emergency downtime was significantly reduced, and the director ... 0.012 mm. In the processing, it is
paved his way from parking to the office through this simple and intuitive visualization tool. important to ensure the alignment Considering that the processing time exceeds
of the workpiece and the tool, the the time of temperature stabilization [4, 5], the
absence of deformation of the thin- process of heating the workpiece with a moving
walled workpiece during its fastening. source can be represented as the result of the action
In this regard, honing is often used of an equivalent distributed heat source, and consider
fixing the sleeve in a rubber cuff for the problem in a stationary setting.
mounting the sleeve over the hon. In accordance with [6], the work of honing
D.V. Korotnev, trainer-consultant of GC Orgprom.
Clamping-releasing the workpiece is almost completely turns into heat. The circumferential
performed by compressing the cuff force Pok is proportional to the total area of the
using air pressure. working part of the honing bars Sbr and the specific
Preliminary honing is performed pressure of the bars ru: Pok = ρok ∙ Sbr ∙ pу.
at high speeds and with a relatively The coefficient of proportionality pok in the first
large allowance to correct errors in approximation is taken equal to 0.4. The distribution
the location and shape of the hole. of heat between the workpiece, tool, chips, coolant
Significant efforts can lead to elastic depends on the processing speed [7]. Part of the
deformation of the workpiece. The final amount of heat transferred to the workpiece for
honing, unlike most other machining speeds W = 40 ... 80 m / min is 0.4 ... 0.65. Thus, it
methods, is carried out at lower speeds, is possible to evaluate the heat (Q, W) entering the
which helps to reduce processing errors, workpiece using the expression:
including those caused by thermal
deformation of the workpiece, but Q = 0.4∙kзгW∙Sбр∙py, (1)
reduces the productivity of the process.
The temperature of the workpiece where kзг = 0,4…0,65.
usually does not exceed 50 ... 100 ° The total amount of heat entering the
C [1, 2, 3, 4], which, depending on its workpiece, calculated for different processing modes
size, can lead to a change in diameter [6] in accordance with (1), is shown in table 1.
by 0.03 ... 0.05 mm. We assume that the axial velocity of the hone
The workpiece under the action V varies according to a harmonic law, and we will
of a movable heat source, the role of proceed from the assumption that the amount of
which is played by the honing process, heat received by the elementary ring pad dF released
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