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problems of cutting tool design for wooden shaped surfaces.

by:QY Precision      2019-11-02
Abstract: The processing of wood profiles needs to solve the tool geometry, which makes the tool wear in the cutting process minimum.
Where the tool is out of contact with the material being cut, the main problem can be solved.
In the process of using concave tools, this problem is more important.
Then, it is easier to solve the profiling problem of such tools using CAD system, in which any results can be verified immediately.
Key words: Design, profile, tool, wear, CAD 1.
Brief introduction the problem of forming tool design is to first produce all the planes of a cutting wedge.
These are planes on the front and on the side.
They are represented in a tool diagram with a corresponding angle.
In order to correctly solve the problem of the tool, these angles must have appropriate values according to some rules that will ensure the effectiveness of designing the tool.
Therefore, to start the design, it is important to consider all the conditions related to the problem as the machine tool parameters and the process conditions of the cutting process, including the workpiece material and the tool material.
The forming cutting tool for wooden profiles is mainly a flat tool made of high strength steel material fixed in a fixed body.
Because the wooden profile is usually four.
In some cases, it is necessary to consider the \"overlap\" of forming curves \". 2.
The base cutting tool is used to separate the chip from the working material and produce a new surface.
The most important part of the tool is cutting and fixing pieces.
The fixings are always related to the machine tool that uses the tool.
This part must be solved with cutting force.
The creation of wedge geometry is the most important part of the solution to the building problem, because the wedge is an indirect interaction with the workpiece.
The wedge forms a chip, which affects the quality and quantity of production.
It is necessary to distinguish between the geometry given by the designer and the geometry given by the cutting tool and the movement of the workpiece to each other.
When forming a tool, the designer often has to solve the problem of the critical point, because the tool gap angle is zero, which may cause the shape edge to appear dislike.
As can be seen from Figure 1, this is more important on concave cutters. 1. [
Figure 1 slightly]
This problem can be solved on cutting tools with open profile. What is the outline of the endpoint tangent containing an angle less than 180 [degrees].
However, if any tangent line is perpendicular to the axis of rotation, a problem with the critical point of the cam profile occurs.
For this instance, a solution exists (Chladil 2004).
Since the learning angle of the critical point cannot be zero, it is necessary to design the tool in order to produce the shape from the deviation direction shown in Figure 12. [
Figure 2:From the Fig.
2 Case use [Representativepsi]
The direction angle generated by the contour (
The tangent line for the peripheral point contains the profile of 90 [degrees]
The direction of departure is [psi]=90 -[[kappa]. sub. r], where [[kappa]. sub. r]
Cutting edge angle).
The intersection of direction and shape profile refers to the point of tool gap [[alpha]. sub. [psi]]
Has its maximum value.
Provide minimum tool gap [[alpha]. sub. min]
At the intersection of the horizontal line with the shape curve and tool orthogonal gap [need[alpha]. sub. 0]
It is considered to be on the vertical line where the shape curve intersect and then the tool side oblique angle [psi]
From the equation (1): tg [psi]= tg (90 -[[kappa]. sub. r])tg [[alpha]. sub. min]/ tg[[alpha]. sub. 0](1)
Forming tools are used for milling or machining special shapes on the workpiece.
Since different shaped shapes are very easy to form in cutting operations on CNC machine tools, the use of these types of knives is slightly reduced.
Nevertheless, in addition to the rotation operation, many milling processes still require forming milling knives, and the easiest way to produce them is to use forming cutting tools or grinding methods. 3.
The shape of the wood profile cutting tool that forms the cutting tool is created on the side plane.
The length of the shape depends on the type of production and also on the cost of production.
In the wood industry, cutting tools are most often solved as blades fixed in the base body (Lisican, 1996).
This is equivalent to flat cutting tools in the metal industry.
The general wooden profiles are four
Side profile, so it is necessary to solve our forming tool, which processes the profile from the four directions perpendicular to each other as shown in the figure3 (Chladil, 2004 B). [
Figure 3 slightly]
Since these cutting tools must be addressed to produce profiles with sufficient geometric and dimensional accuracy, it is necessary to create their profiles to ensure that accuracy requirements and [OVERLAP][alpha]. sub. min].
Another technique to solve this problem is possible.
It includes determining the points that form the profile, and creating deflection tangents on both sides to make them overlap.
The intersection I of the tangent has a deviation from the forming curve, and its height means the error of the geometric profile seen from Figure 14. [
Figure 4 slightly]
In order to solve the height of the error, it is necessary to determine the depth of the arch and the deviation angle of the tangent: error = R (1/cos [alpha]/2 -1)(2)
Where the error is the deviation between the tangent intersection points (I)
Circular arch R is the radius of the arch [alpha]
Is the angle between the tangents in the equation (2)
Tangent deviation [it is also possible to derive the response angle]alpha]: [alpha]= 2 x arccos (R/ERROR + R)(3)
If a small angle between tangent lines is applied, these equations are also applicable to noncircular curves. g. [+ or -][degrees]or [+or -]2[degrees].
Then the actual error can be ignored (
Evaluation of the expression [in parentheses]+ or -]1[degrees]
Is [0,00015233]+ or -]2[degrees]is 0,00060954). 4.
The solution for the shape cutting tool the cutting tool should have the geometry of the tool wedge to ensure the best tool life.
This first involves the tipping point of most of the edges of the tool mentioned earlier.
Solve the shape cutting tool from Figure 1 to produce the profile
CAD system is used.
The split point at the upper part of the profile is set using a tangent of 42,5 [drop]degrees]and 47,5[degrees]
From the perspective of what the horizontal line means respectively, \"overlap\" is 5 [degrees].
Since the forming curve is an ellipse, more application functions are needed to solve the normal and tangent lines as well as the estimation of tangent points using the CAD system.
The curvature radius of the tangent point differs by a few percent, and the calculation error is also different, which means that the deviation is negligible.
In addition, upper forming tools with 47, 5 [angles]degrees]was drawn.
Preparation of side tools for 42,5 [angle] with the same proceduredegrees]
The upper half and 5 [degrees]
Outward Chiwei at the bottom.
The construction of the forming tool both tools complete the condition of the minimum working geometry under the [gap angle][alpha]. sub. min]= 2[degrees].
In order for the CAD data of the upper and side tools of the drawing object to be transmitted and processed in the CAM system to generate the ecnc program (Chladil, 2001).
The result is the main blade used to grind the forming tool (Lukovics, 2001)
Use the cutting geometry corresponding to Table 1. 5.
Recently, cutting tools have been used much less than in the past.
This is due to the development of computer technology and the corresponding capabilities of CNC machine tools.
Forming milling tools in the metal industry are produced on a dedicated vehicle bed, using knives that meet the requirements of optimal geometry and tool life.
Nevertheless, in the wood processing industry, forming milling tools are still widely used, it is a basic body made of building steel, with steel blades that form the desired shape on a specific grinding machine
To ensure the long life and sufficient accuracy of these blades, wedge geometry and tool profiles must be addressed.
CAD and CAMsystems are used to control all processes.
The solution to the forming tool and its geometry is part of the research plan VZ msm6215648902 approved by msmcr. 6.
Chladil, J. (2004)
, Geometric problems with plastic cutters, Strojarska Gracia 2004--(
Production Technology, pp. 184-190, ISBN 80-8070-300-
0. sulov, September 2004, Zilin ska University, Zilin na charadir, J. (2004)
, The problem of the wood profile production molding tool solution, the program of Trieskove a beztrieskoveobabanne dreva-(
Wood chips and chip-free work), pp. 105-111, ISBN80-228-1385-
0, Stary Smokovec, October 2004, University of Technology, J. Zvolen Chladil(2001)
, Optimization of tool selection for rotating parts machining NCMachine, Strojirenska swiie (
Engineering technology), Vol. 1, No.
Page 2/01, February 2001. 11-15,ISSN 1211-4162 Lisiean, J. et al. (1996)
, Technika spracovania dreva in Teoria (
Theory and Technology of wood processing
ISBN80, Matcentrum-967315-6-
Zvolen Lukovics, I. (2001)
, Vykonne brouseni nastroju a naradi (
Efficient grinding of cutting tools and tools)
ITC 2001-Proceedings-Tools2001, pp. 154-157, ISBN 80-7318-008-
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