JP4221117B2 - Molding sheet mold production equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention, a prism sheet, a relatively fine, such as a lens sheet, relates to a the production equipment of the mold for shaping the sheet used to produce the shaping sheet having a regular unevenness It is.
[0002]
[Prior art]
Conventionally, when forming a mold used for molding a molding sheet that is relatively fine, such as a prism sheet or a lens sheet, and has a regular concavo-convex shape, the molding sheet shape is fine. In the cutting of a cylindrical mold using a lathe, the position accuracy is maintained by performing cutting continuously in a spiral shape with one cutting tool having one cutting tip.
[0003]
[Problems to be solved by the invention]
However, since the conventional manufacturing apparatus described above performs cutting continuously using a single bite, there arises a problem with the durability of the cutting tip such as wear or breakage of the cutting tip. It was difficult to manufacture accurately. In particular, a mold for a molding sheet having fine and sharp irregularities such as a prism sheet is required to have strong printing durability for the reason of manufacturing the molding sheet. Therefore, the material used for the molding mold has a hardness. Highly difficult-to-cut materials are desirable, but as described above, it has been difficult to process such materials.
[0004]
FIG. 4 is a diagram showing a method of processing a difficult-to-cut material by a conventional manufacturing apparatus.
The cutting tool 1 is provided with a cutting tip 1 a on a shank 1 c and is fixed to a tool post 3. The mold material 4 is a difficult-to-cut material and is attached to a lathe and rotates. Cutting is started from the cutting groove 4V ₁ of the molding material 4, and the tool post 3 is sent in the feed direction indicated by the arrow F in the figure, thereby proceeding with the cutting grooves 4V ₁ and 4V ₂ . However, the tip of the cutting tip 1a to the mold material 4 is difficult to cut materials also will be scraped (1a-2), the second half working cutting groove 4V _(n-1), come to 4V _n, which originally required The shape of the cutting groove (4V ₁ etc.) cannot be processed.
[0005]
Further, in the conventional manufacturing apparatus, even if the material can be processed when the fine uneven shape has a regular cycle that is a repetition of one simple shape, it is a number when it is a repetition of two or more simple shapes. It is necessary to perform machining in several times and change the tool every time. This reduces the accuracy of the work and requires a lot of time and labor for machining, and the price of the mold has increased several times.
[0006]
FIG. 5 is a view showing a processing method of the mold 5 which is a repetition of two or more simple shapes by a conventional manufacturing apparatus.
Machining is performed by using the cutting tool 1 with the cutting tip 1a and replacing the remaining valley B with the cutting tool 2 with the cutting tip 2a. When machining is performed in this process, errors such as mounting errors due to replacement of tools, feed amounts and positions in the feed direction due to repeated machining, and cut amounts in the cutting depth direction are integrated, and the dimensions of the machined mold processed. The optical characteristics of the prism sheet and the like molded by the mold 5 are difficult to satisfy the target characteristics, and the man-hour required for processing the mold 5 is doubled. Was several times more.
[0007]
The object of the present invention is to provide a mold for a forming sheet that can be processed with high accuracy even with difficult-to-cut materials, and can be processed with high accuracy in a short time even with a combination of simple shapes with unit irregularities of 2 or more. to provide a production equipment.
[0008]
[Means for Solving the Problems]
The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this. That is, the invention of claim 1 is the manufacture of a forming die for a forming sheet, which is used for manufacturing a forming sheet formed by forming a plurality of unit concavo-convex shapes in a one-dimensional or two-dimensional direction with a regular regular period. It is an apparatus, Comprising: The cross-sectional shape which cuts the said to-be-cut material in a trough shape in the tool post (13) which moves relatively in a cutting depth direction and / or a feed direction with respect to a to-be-cut material ( 20 ) is substantially. A triangular first cutting tool (21a) and a second cutting tool (21b) having a substantially triangular cross section for cutting the workpiece into a valley shape and having the same shape as the first cutting tool were mounted. A cutting tool (21) is provided, the first cutting tool is in a position to be sent before the second cutting tool, and the feed direction of the first cutting tool and the second cutting tool Y, and the regular period in the feed direction of the first and second cutting tools as P When an integer equal to or greater than 1 is n, the relationship is Y = nP, and the second cutting tool sent later has the same valley shape as the position cut by the first cutting tool sent earlier. An apparatus for manufacturing a forming die for a shaping sheet , characterized by tracing a position .
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.
(First embodiment)
FIG. 1 is a view for explaining a first embodiment of an apparatus for producing a forming die for a shaping sheet according to the present invention. Note that, in the description of the embodiment described below, the same reference numerals are given to the portions that perform the same functions as the above-described portions, and overlapping descriptions are appropriately omitted.
1st Embodiment is the manufacturing apparatus and manufacturing method of a shaping | molding die for shape | molding the prism sheet | seat which is continuous although the cross-sectional shape of the unevenness | corrugation of the shaping sheet surface combines two types of substantially triangular shapes, Is related to the attachment of the cutting tip to a cutting tool, particularly a shank, in a lathe.
[0022]
The molding die 10 is a cylindrical copper blank before cutting, and a necessary fine uneven shape is produced on the surface by cutting while rotating it with a lathe (not shown).
[0023]
The cutting tool 11 is provided with a cutting tip 11a, 11b on a shank 11c, and is fixed to the tool post 13 with the shank 11c. The shape of the cutting tip 11a is a shape that matches the deep valley shape (10V ₁ , 10V _k , 10V _{(k + 2),} etc.) of the mold 10 to be cut. The shape of the cutting tip 11b is shallower valley shape of the mold 10 to cut _{(10V 2, 10V (k-} 1), 10V (k + 1) , etc.) is a shape that fits.
[0024]
FIG. 2 is an enlarged perspective view of the prism sheet molded by the mold 10 manufactured according to the first embodiment.
The prism sheet 15 has a combination of two types of peaks, large and small, that are regularly connected. The peak position difference Z = 30 μm, the left / right difference m = 25 μm, and the regular period P = 50 μm.
[0025]
Returning to FIG. 1, since the forming die 10 is a die of the prism sheet 15, dimensions such as Z and P are also equal to the prism sheet 15. Here, for the sake of simplicity, the contraction after the molding of the prism sheet is not considered.
[0026]
The distance Y between the cutting tip 11a and the cutting tip 11b is fixed so that Y = nP + m, where m is 0 <m <P and n is an integer of 1 or more.
[0027]
Here, since n = 100 and m = 25 μm and P = 50 μm, Y = 5025 μm. Therefore, the cutting tip 11a and the cutting tip 11b were fixed to the shank 11c so that Y = 5025 μm and Z = 30 μm. The fixed position accuracy was ± 1 μm.
[0028]
Cutting was performed in a spiral shape by rotating the mold 10 while feeding the tool post 13 with the cutting tool 11 fixed in the direction of arrow F at a constant speed. The feed rate was set so that the same amount as the regular period P was fed when the mold 10 was rotated once. Since the cutting tip 11a is sent before the cutting tip 11b, the cutting tip 11a _first performs deep valley-shaped cutting in the order of 10V ₁ ,..., 10V _k , 10V _{(k + 2)} . Next, cutting with a shallow valley shape is performed in the order of 10 V ₂ ,..., 10 V _(k−1) , 10 V _{(k + 1)} by the cutting tip 11 b fixed at a position delayed by 100.5 P (5025 μm). Is called.
[0029]
Thus, in 1st Embodiment, as a manufacturing apparatus which processes the shaping | molding die 10 which has the uneven | corrugated shape which combined two simple shapes from which a shape differs, two cutting tips of the shape suitable for each trough shape are shaping | molding die. Since it is fixed to the shank 11c in accordance with the shape of 10, the valley shape of the mold 10 can be cut accurately, the processing can be performed at once, the cutting time is shortened, and the manufacturing price is reduced. Can do.
[0030]
(Second Embodiment)
FIG. 3 is a view for explaining a second embodiment of the apparatus for manufacturing a forming die for a shaping sheet according to the present invention.
[0031]
The material of the mold 20 is a Ni-P cylinder that is a difficult-to-cut material, and a necessary fine uneven shape is produced on the surface by cutting it while rotating it with a lathe (not shown).
[0032]
The cutting tool 21 includes cutting tips 21a and 21b in a shank 21c, and is fixed to the tool post 13 by the shank 21c. The shape of the cutting tip 21a is a shape obtained by cutting the tip of the cutting tip 21b by C = 2 μm. The shape of the cutting tip 21b is a shape that matches the shallow valley shape (20V ₁ , 20V _2, etc.) of the mold 20 to be cut, and is specifically an acute triangle with an apex angle of 60 degrees.
[0033]
The mold 20 manufactured in the second embodiment is a simple prism sheet mold having a series of acute triangles with apex angles of 60 degrees, and has a regular period P = 50 μm.
[0034]
The cutting tips 21a and 21b are both fixed to the shank 21c, and the interval Y is fixed such that Y = nP, where n is an integer of 1 or more.
[0035]
Here, since n = 100 and P = 50 μm, Y = 5000 μm. Accordingly, the cutting tips 21a and 21b were fixed to the shank 21c so that the distance Y was set to 5000 μm and the depth direction was Z = 5 μm. The fixed position accuracy was ± 1 μm.
[0036]
Cutting was performed in the same manner as in the first embodiment. The feed rate was set so that the same amount as the regular period P was fed when the mold 20 was rotated once. In the second embodiment, since the interval between the cutting tips 21a and 21b is an integral multiple of the regular period P, the cutting tip 21b cuts deeper and sharper while tracing the same position as the cutting tip 21a cut. . At this time, since the cutting tip 21a has already been cut into shapes of 20V _k and 20V _{(k + 1)} , the burden on the cutting tip 21b is reduced. Therefore, even if it is the shaping | molding die 20 which uses a difficult-to-cut material as a raw material, the problem on durability, such as a tip of a cutting tip being worn or damaged, does not arise in the middle of processing.
[0037]
Thus, in 2nd Embodiment, as a manufacturing apparatus which processes the shaping | molding die 20 which has the same uneven | corrugated shape, one tip was made into flat shape among the two cutting tips of the shape suitable for the valley shape. Is fixed to the shank 21c, so that even if the material is a difficult-to-cut material, the trough shape of the mold 20 can be accurately determined without causing problems in terms of durability such as wear or damage to the tip of the cutting tip. Can be cut. Further, since the machining can be performed at a time, the cutting time can be shortened and the manufacturing price can be reduced.
[0038]
(Deformation)
The present invention is not limited to the embodiment described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention.
[0039]
(1) In each embodiment, the example in which the cutting tool is provided with the cutting tip is not limited to this. For example, the shank portion and the cutting tip portion may be an integrated cutting tool.
[0040]
(2) In each embodiment, an example in which two or more separate cutting tips are mounted on the same shank and fixed to the tool post is shown. However, the present invention is not limited to this. For example, a plurality of cutting tools are used in one tool post. It may be fixed.
[0041]
(3) In 2nd Embodiment, although the example which uses the cutting tip 21a which cut | disconnected the front-end | tip first was shown, when it uses multiple cutting tips of the same shape, for example, the cutting tip sent previously will be Even if worn, the same shape can be obtained because the correct shape is cut by a cutting tip sent later. The same effect can be obtained by using a cutting tip having a rounded tip first.
[0042]
(4) In each embodiment, although the example which cuts in a spiral shape was shown, it does not restrict to this, For example, you may process in order that each trough is independent.
[0043]
【The invention's effect】
As described above in detail, according to the present invention, which is fixed to the same tool rest, a first cutting tool having a substantially triangular cross-sectional shape for cutting the cutting material in the trough-shaped, trough the object cutting material shape Since the cutting shape is substantially triangular and the cutting is performed using the second cutting tool having the same shape as the first cutting tool , the cutting edge of the cutting tool is worn or damaged. Since no problem occurs and machining can be performed continuously, the cutting shape can be made accurate.
[0045]
According to the present invention, the shaping sheet mold of the manufacturing apparatus are the prism sheet, and the exact shape of the mold for a prism sheet, can be provided at low cost.
[0046]
According to the present invention , since the first cutting tool is in a position to be sent before the second cutting tool , a plurality of cuttings can be performed simultaneously, and a plurality of processings can be performed continuously. .
[0050]
According to the present invention , since the first cutting tool and the second cutting tool have a substantially triangular cross-sectional shape and a sharp tip shape, the molding for a shaping sheet having a plurality of prism shapes and the like. The mold can be manufactured accurately and in a short time.
[0052]
According to the present invention , the distance in the feed direction between the first cutting tool and the second cutting tool is Y, the regular period in the feed direction of the first and second cutting tools is P, and the integer greater than or equal to n is n. Then, since Y = nP, the second cutting tool can accurately trace the position cut by the first cutting tool.
[0054]
According to the present invention , since cutting is performed using the first cutting tool and the second cutting tool that are fixed to the same tool stand and cut the workpiece, the cutting edge of the cutting tool is worn away. As a result, durability problems such as breakage do not occur and machining can be performed continuously, so that the cutting shape can be made accurate.
[0055]
According to the present invention , since the first cutting tool and the second cutting tool are simultaneously moved in the cutting depth direction and / or the feeding direction with respect to the workpiece, the cutting tool tip is moved. Durability problems such as wear and damage do not occur, and machining can be performed continuously, so that the cutting shape can be made accurate. Also, a plurality of shapes can be processed simultaneously.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a first embodiment of the present invention.
FIG. 2 is an enlarged perspective view of a prism sheet molded by the molding die according to the first embodiment.
FIG. 3 is a diagram for explaining a second embodiment of the present invention.
FIG. 4 is a diagram illustrating a conventional technique.
FIG. 5 is a diagram illustrating a conventional technique.
[Explanation of symbols]
1, 2, 11, 21 Bite 1a, 2a, 11a, 11b, 21a, 21b Cutting tips 1c, 2c, 11c, 21c Shank 3, 13 Tool post 4, 5, 10, 20 Mold 15 Prism sheet

Claims (1)

An apparatus for manufacturing a forming mold for a forming sheet, which is used for manufacturing a forming sheet formed by forming a plurality of unit irregularities in a one-dimensional or two-dimensional direction with a regular regular period,
A first cutting tool having a substantially triangular cross-sectional shape for cutting the workpiece into a valley shape on a tool post that moves relative to the workpiece in the cutting depth direction and / or feed direction, and the workpiece a cutting tool cross-sectional shape for cutting the wood to the valley shape and a second cutting tool of the first cutting tool and the same shape are mounted in a substantially triangular
With
The first cutting tool is in a position to be sent before the second cutting tool,
When the distance in the feed direction between the first cutting tool and the second cutting tool is Y, the regular period in the feed direction of the first and second cutting tools is P, and an integer equal to or greater than 1 is n. ,
Y = nP,
Moreover, the second cutting tool to be sent later traces the same valley-shaped position as the position cut by the first cutting tool sent earlier,
An apparatus for producing a forming die for a shaping sheet.

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