Method for production of relief in functional layer of print form

FIELD: metallography, possible use for forming submicron relief structures in functional layers of metallographic forms.

SUBSTANCE: in accordance to method, by means of at least one technological transition sides 4,5,6,7 of profiled linear groove 8 of pattern fragment 3 are formed by means of shaping of functional layer of product 2. After full profile of groove 8 is formed, in internal corners of mating sections, at least parts of sections of curvilinear contour of groove 8 with different, relatively to base coordinates system, angular orientation, cold-hardening is removed which appeared during plastic deformation of material of functional layer during forming of profiled contour of groove 8. For that purpose in bisector area of aforementioned mating sections cuts 10 are made, directed towards area of groove 8 adjacent to bottom with exit of cutting part of tool onto upper plane of functional layer of product 2. Cuts 10 are made by shaping with length not exceeding size of side 4 or 5 of profile of groove 8 in direction of cut 10 in place where aforementioned cut 10 is made. Cut 10 is, as a rule, made during one pass of tool.

EFFECT: increased efficiency of process, increased precision and quality of processing due to elimination of cold-work strengthening.

3 cl, 4 dwg

 

The invention relates to a wide range of areas of modern machinery, industrial implementation object which is associated with the use of micro - and/or nanometer technology. The claimed invention can be implemented by industrial widely known cutting tools - planer cutters. In particular, the invention can be used for automated formation (for example, through multi-pass processing planing) submicron structures of the topography of the functional layers of metallographic print forms (cliche)that are used in the production of various types of securities (requiring a high degree of protection against forgery), as well as in other areas of technology, to retrieve the image (topography) of a given configuration and depth with sub-micron resolution structures of this figure (relief).

Since all the main disadvantages of the following (known from the prior art) methods of obtaining relief (picture) in the functional layer of the printing form most explicitly manifested in precision processes of the formation of structures of the above-mentioned relief with submicron accuracy (resolution) of their geometrical parameters (for example, in manufacturing processes of metallographic printing plates for intaglio printing), it is advisable to disclose the main features of these PR the processes, associated with the requirements for restrictions on the precision of the parameters generated by these processes specialized structures.

In particular, metallographic printing plate for gravure printing, used for receiving printed products (requiring a high degree of protection against forgery), have on the working surface (i.e. in the functional layer) tabs (forming a straight line) mainly trapezoidal profile generated by performing the corresponding profile of the grooves. Accuracy requirements of the components of these projections and their form (and therefore to the same elements of the above-mentioned grooves) are characterized by the following deviations from the nominal parameters:

- deviation from the specified form - 3 microns;

- deviation from the predetermined width is 4 μm;

- deviation from a given height (depth) - 5 microns;

- the deviation of the line elements of the profile (side faces the bottom of the engraving and edges) from the flatness and straightness - 4 ám.

When processing functional layer, for example, metallographic printing forms as accurately as possible the formation of contours and profiles relief elements (in particular, protrusions, forming a straight line, respectively, and grooves through which these protrusions formed) is necessary at the surface is based area of the functional layer. These plots are generated terrain depends on the quality of the printing form and accordingly prints with it. Obviously, by removing material of the functional layer from the space between the projections (straight lines) in the deep zone forming these projections grooves valid rougher treatment, because the precision of the deep sections of convex elements of the picture to a much lesser extent affects the quality through the printed form of prints.

A method of obtaining a closed contour elevation in the functional layer of the product by means of laser processing (SU # 1508468).

According to this known from the prior art method of forming a profile of the fragments of the relief is as follows.

The laser light through a lens Assembly with an off-center rectangular pupils focus on is placed in the focal plane of the above-mentioned lens unit mask stencil, which diafragmirovat peripheral radiation for external and internal contours of the shapes of the openings of the mask or stencil. Next diaphragmatically stream of laser radiation through the projection lens is projected on the surface of the functional layer of the processed product. As a result of this (through the projection lens) provide parafac is Siroco image of the shape of the openings of the mask or stencil on the processed functional layer of the product with the given reduction.

The disadvantages of this method of treatment should include (in addition to the high cost of special equipment required for its implementation), the relatively low resolution of the formed structures of relief. The reason is that when using optical systems, as a rule, there are fundamentally insurmountable limitations on the accuracy of the projected on a functional layer formed image pattern caused by diffraction and abberation effects in optical systems, as well as defocusing of the projected image during processing of the deep levels of the functional layer.

In addition, following the above method on the accuracy of the formed functional layer products relief overlay error of making the contour of the terrain (figure) directly in the mask is a stencil, and inherent in this type of processing variation of flatness of faces and evaporated deposition (spray) material for finishing the surface of the functional layer of the product (i.e. the surface not subject to any post-processing).

The closest in technical essence and the achieved result to the stated object of the invention is a method of obtaining relief in the functional layer of the printing form, according to the but which by successive technological transitions form the side faces, at least one of the profile projection (or groove) of a piece of terrain (figure). One of the technological transitions carry out delineation mentioned protrusion (grooves) on the perimeter, at least from one of the generated faces, through education on the lines of the corresponding edges of the lug grooves with a depth of less height of the protrusion (or the depth of the grooves forming the ledge). Followed by removing the remaining seam allowance between the elements of the ledge (grooves) with the formation of a given profile without compromising the integrity formed in the process of contouring the area of the corresponding face. The process of forming the side faces of the projection (or groove) is realized by means of multi-pass processing of the functional layer of the printing form by cutting. Before contouring, mate, at least part of the contour plots of the ledge (grooves) with different relative to the base coordinate system, the angular orientation of the cut directed from the region adjacent to the contour line, in the area of the deleted allowance bisectorial grooves. Remove remaining after contouring seam allowance carried out in two stages. In the first stage, equidistant formed in the process of contouring the groove, cut groove with a depth equal to the set of vistavista (or the depth of the underlying grooves), moreover, in the process of forming this groove cutting edge (forming face of the protrusion) is shifted to the side of the deleted allowance by an amount limited technological access for processing and providing the exception of contact between this cutting edge with a plot of the faces of the protrusion formed in the process of contouring. In the second step removes the remaining allowance by successive passes of the tool in the area, which is limited formed at the first stage groove. This include the ability to exclude the contact of the cutting elements of the tool formed on said first step face of the profile ledge (publication application no PCT/RU01/00533, 2002).

The disadvantages of this method of obtaining relief in the functional layer of the printing form should be attributed to its technological complexity due to the fact that the full loop requires consistent implementation of several technological transitions, as well as the lack of precision and surface quality of the faces of the formed relief, because by performing bisecting grooves can only slightly reduce the formation of work hardening in the plastic deformation of the material of the functional layer of the printing form during the interaction of this material with the rear surface of the cutter at GDC is olinynyk (broken) parts of the contour of the groove. The reason is that the formation of bisecting grooves carried out before formation of the relief (i.e. core grooves).

The basis for the claimed invention was based on the task of creating such a method of obtaining relief in the functional layer of the printing form (product), which would increase the maintainability of the overall process for improving the accuracy and quality of treatment due to the possibility to eliminate work hardening in appropriate areas of the circuit grooves fragment of a relief after the formation of her full profile.

The problem is solved by that in a method of obtaining relief in the functional layer of the printing form according to which by means of at least one technological transition form the side faces of the profile of the curvilinear grooves fragment of relief by processing the functional layer of the printing form by planing, according to the invention in the inner corners and in areas with a smaller radius of curvature, interfaces, at least part of the curved sections of the path mentioned grooves with different relative to the base coordinate system, the angular orientation of the remove work hardening formed during plastic deformation of the material of the functional layer when forming the profile crinoline the aqueous contour of the groove, in bisectorial area mentioned interfaces perform incisions directed from the region adjacent to the bottom of the groove with the release of the cutting tool on the upper surface of the functional layer of the printing form.

Suitable incisions to perform the planing length not exceeding the size of a side face of the profile groove in the direction of the incision in the place of performance of this incision.

Optimal incision to perform in a single pass of the tool.

The invention is illustrated graphics.

Figure 1 - outline of the formed relief (profile curvilinear grooves)in the plan.

Figure 2 - cross section a-a of figure 1 (profiles fragments of patterns formed on the functional surface of the printing form with the designation of the key elements of this profile).

Figure 3 - callout I of figure 1.

Figure 4 - a section b-b in figure 3.

The method of obtaining relief in the functional layer of the printing form (product) is as follows.

First, it is useful to note that according to the present invention, the term "product"generally refers to a model printed form containing the finished profiled figure 3 (relief) from a set of grooves forming contour lines) and edges (forming a straight line), obtained by the methods of computer graphics which provides the required quality from the claims.

Before the implementation of the patented process generated in the functional layer 1 of the printing form 2 total relief of figure 3 are divided into separate processing objects - fragments of figure 3, represents a meaningful part of this figure, which is not bound, for example, the General tabs (forming in terms of direct line) with other finished parts of this picture.

Next is the immediate processing in accordance with the patented method, which consists in forming a functional layer 1 of the printing form 2 of the above-mentioned fragments figure 3.

In the functional layer 1, the printing plate 2 by at least one technological transition form the side faces 4, 5, 6 and 7 profile curved grooves 8 a fragment of figure 3 through the processing of the functional layer 1 of the printing form 2 planing. The formation of the mentioned profile of the groove 8 is carried out by any known from the prior art the processing circuit. After the formation of the profile mentioned curved grooves 8 in the inner corners (as well as in areas with a smaller radius of curvature) interfaces, at least part of the curved sections of the contour of the groove 8 with different (relative to the base coordinate system) of the angular orientation of the remove on the LEP (causing a swelling of the material of the functional layer 1 above the plane 9), formed during the plastic deformation of the material of the functional layer 1 during the formation of the profile contour of the groove 8. For this bisecting area mentioned interfaces perform incisions 10 directed from the region adjacent to the bottom of the groove 8 with the release of the cutting tool on the upper surface 9 of the functional layer 1 of the printing form 2. Cuts 10 also perform planing with a length not exceeding the size of the side face 4 or 5 profile of the groove 8 in the direction of the incision 10 in place of the execution of the incision 10. The notch 10, as a rule, carried out in one pass tool (cutter), the cutting direction when performing cuts 10 in figure 1 is shown by arrows 11.

An example of a specific implementation of the patented method of obtaining relief figure 3, the functional layer 1 of the printing form 2.

Practical implementation of the patented method was implemented on a special engraving machine (mounted in termokonstantnye the location on the basis of the known from the prior art standardized equipment and components) on set of operations reflected in claims 1 to 3 claims on the example of forming a closed profile grooves, profile configuration which is shown in figure 2 graphic materials with the following technologically predetermined geometrical parameters:

- width to the skill sets in the upper section - 50 µm;

- the depth of the grooves 35 microns;

- the length of the contour grooves on its longitudinal axis 11 mm;

- deviation from the specified form - 1 µm;

- deviation from the predetermined width in the upper section - 4 µm;

- deviation from the desired depth is 1 μm;

- the deviation of the line elements of the profile faces, the bottom of the grooves and ribs) from the flatness and straightness - 4 ám.

As the cutting tool was used universal cutter with angle at the vertex of 60 degrees and a width transverse cutting edge 10 μm. Workpiece material products 2 - brass brand L. Maximum cutting depth coordinate Z was 15 microns in a single pass of the tool, the cutting speed of 300 mm/min

Measurement of geometrical parameters generated in the functional layer 1 of the printing form 2 structures of the relief (in particular, grooves 8, forming a straight line), showed that actually obtained in the process in accordance with patent-pending technology deviations do not exceed technologically regulated field of tolerance in the manufacture of printing plates for intaglio printing, used in the manufacture of banknotes and other securities, requiring submicron resolution fragments figure 3 print. Namely, the respective ranges of deviations were within the following limits:

- otklonenie is from the specified form - ±1 μm;

- deviation from the predetermined width in the upper section of the ledge - ±2 microns;

- deviation from the desired depth - ±1 μm;

- the deviation of the line elements of the profile faces, the bottom of the grooves and ribs) from the flatness and straightness - ±0.5 micron.

Thus, patent-pending way to obtain relief in the functional layer of the printing form by cutting (slicing) of the specialized structures of the formed pattern (elevation) can be industrially implemented in different areas of technology. For example, the formation of mechanically relief in the functional layers of metallographic print forms (cliche) for gravure printing with sub-micron resolution of the formed structures (printed and gap elements), used primarily in the production of banknotes and other securities (requiring a high degree of protection against forgery), as well as in other fields of technology where necessary to obtain a functional layer product elevation (profile picture) with the specified sub-micron resolution of the structures.

1. The method of obtaining relief in the functional layer of the printing form according to which by means of at least one technological transition form the side faces of the profile of the curvilinear grooves fragment of relief through processing functional layer pécs is based shape planing, characterized in that in the inner corners and in areas with a smaller radius of curvature, interfaces, at least part of the curved sections of the path mentioned grooves with different relative to the base coordinate system, the angular orientation of the remove work hardening formed during plastic deformation of the material of the functional layer when forming the profile of the curved contour of the groove, which in bisectorial area mentioned interfaces perform incisions directed from the region adjacent to the bottom of the groove with the release of the cutting tool on the upper surface of the functional layer of the printing form.

2. The method according to claim 1, characterized in that the incisions do planing with a length not exceeding the size of a side face of the profile groove in the direction of the incision in the place of performance of this incision.

3. The method according to claim 1, characterized in that the incision is carried out in a single pass of the tool.



 

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