JPH11198099A - Lateral pressure cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To respectively change loads of streaks in accordance with a difference of distortional quantity by furnishing a streak load variable means to vary a streak to a streak load computed for each part of a workpiece by a streak load computing means as the streak load in accordance with a position at the time of providing the streak. SOLUTION: After a distortional state of a workpiece 1 observed by a distortion checker 15 is converted to an image signal by using a CCD camera, etc., it is classified in steps on intensity levels by a distortion detecting means. Thereafter, an optimum streak load at a cutting point is selected in accordance with correlation of a notch load of step classified distortional quantity and previously collected distortional quantity by a streak load computing means, and its information data is delivered to a streak load variable means 29. It is possible to stamp a load of a streak corresponding to each distortional quantity of the workpiece 1 by this streak load variable means 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for cutting a workpiece by lateral pressure, and is applied to a field where a high-quality cut surface is required and cutting of the workpiece suitable for mass production is required. The present invention relates to a side pressure cutting device used in a step of cutting a workpiece, for example, a rod-shaped long glass, which is used when a glass optical element such as a glass optical element is formed by pressing.

[0002]

2. Description of the Related Art Conventionally, mass-production techniques for aspherical glass lenses by a molding method suitable for mass production of aspherical glass lenses have been established and are up to the present day. Most of optical element materials used in molding such glass lenses have a spherical polishing, a polishing ball, or a polishing cylindrical shape.

[0003] As a method of processing the above-mentioned cylindrical optical element material, a rod material is cut, polished, wrapped and polished to obtain an optical element material having mirror surfaces at both end surfaces. Recently, a lateral pressure cutting method (hereinafter, referred to as a disking method) utilizing material destruction by lateral pressure has been proposed.

[0004] This processing method does not generate chips and noise during processing, requires little processing time and processing energy, and the lateral pressure during processing does not depend on the size of the workpiece. It is a constant value, and the cut surface becomes smoother,
In particular, glass and ceramics have many advantages not seen in conventional processing methods, such as a mirror surface.

The structure of a conventional side pressure cutting apparatus using such side pressure cutting will be described with reference to FIG. 3, for example, as disclosed in Japanese Patent Application Laid-Open No. Hei 7-132500. The first metal member 6 and the second metal member 7 prevent the pressure seal member 5 from being in direct contact with the pressure seal member 5 and prevent the pressure seal member 5 from being damaged.
A so-called stopper ring method using the same is used.

In this stopper ring system, a plurality of pressure sealing members 5 are applied while deforming a pair of pressure sealing members 5 by applying a tensile force in an axial direction on a rod-shaped workpiece 1 and a pressing force in a radial direction on the workpiece 1. This is a cutting method, in which each pressure seal member 5 is fitted in a state of being surrounded by a step portion of each metal member 6, 7 so as not to directly contact the workpiece 1.

This side pressure cutting device is provided with a boosting line 1
1, a pair of metal members 6, 7 provided in the pressure container 10, and a pair of pressure seals provided at both ends of the side pressure transmission cylinder 3 having a length corresponding to one cut. A hydraulic pump 14 for supplying hydraulic oil 18 into the pressure chamber 9 between the members 5, a pressure generating device 12 in which the hydraulic pump 14 and the intensifier 13 are incorporated, and one side of the second metal member 7. And a holding member 8.

The bar-shaped workpiece 1 is machined so as to maintain a surface roughness of Rmax = 3.25S or less, and a streak 2 is provided before cutting. The striations 2 of the workpiece 1 are inserted up to a position facing the boost line 11 in the side pressure transmission cylinder 3 of the pressure vessel 10. Hydraulic oil 1 from pressure generator 12
When 8 is introduced into the pressure vessel 10 via the pressure raising line 11, a compressive stress is generated on the outer peripheral surface of the workpiece 1 via the side pressure transmission tube 3, and a tensile stress is generated at the center. . The tensile stress generated inside the workpiece 1 increases in proportion to the applied pressure. When the tensile stress exceeds the tensile strength of the workpiece 1, the workpiece 1 is broken and cut at that point. At this time, although there is a time difference from the streak 2 located in the side pressure transmitting cylinder 3, they are cut almost simultaneously. The pressure medium 4 is filled between the workpiece 1 and the side pressure transmission cylinder 3 so that the lateral pressure 17 is evenly applied to the outer peripheral surface of the workpiece 1.

[0009]

However, the conventional side pressure cutting device as described above has the following problems. The problem will be described.

The rod-shaped workpiece 1 used in the conventional lateral pressure cutting device based on the disking method is preferably originally free from internal distortion. However, although it is not different from the normal workpiece 1 in visual confirmation, a large number of internal distortions are generated in the actual workpiece 1 and irregularly remain in various places in the longitudinal direction of the workpiece 1. This was revealed by observation with a strain tester.

When the workpiece 1 having the internal distortion is cut by the disking method, the weight accuracy and the surface quality of the cut surface are remarkably reduced, and the workpiece 1 includes uncut portions. This is one factor that greatly deteriorates the cutting property of the object 1.

In general, the internal strain of glass can be almost completely removed by annealing from the glass softening point to ordinary temperature without applying a force for regulating from outside.
If the workpiece is annealed after being processed into a bar shape, the stress previously regulated is released, so that an error occurs in the finished dimension of the workpiece 1. For example, there is a problem in that the workpiece 1 is warped in the length direction, or the outer diameter has an elliptical or flat cross-section, and cannot be used as a disking material. .

In general, internal strain is classified into "class" by an optical path difference occurring per 1 cm in thickness. The workpiece 1 whose outer peripheral surface is machined is used through a manual process of discarding a workpiece 1 having a large internal distortion, that is, a workpiece 1 of a low grade as a defective product as it is, and selecting only a workpiece having a small internal distortion as much as possible. Was disadvantageous in terms of cost in terms of productivity.

Actually, a cutting experiment was performed on the workpiece 1 having internal distortion under the same cutting conditions as those without distortion using the disking method.
The result is that the weight accuracy and surface quality of the cut surface are reduced, and uncut portions are also likely to occur. As a countermeasure against this result, it is necessary to try cutting by applying a larger cutting energy.

On the other hand, in the present construction method in which the pressure is increased and reduced, the rod-shaped workpiece 1 is repeatedly expanded and contracted in the radial direction or the axial direction, so that the side pressure transmitting cylinder 3 necessary for maintaining the airtightness is obtained. And the pressure seal member 5 deteriorates.

Further, there is an indenter stamped on the outer peripheral surface of the workpiece 1 used as another consumable member. When an excessively large load is excessively applied, a wave-like unevenness centering on the two streaks is generated. As a result, there is a problem that the surface quality is deteriorated and the tip of the indenter is apt to be chipped.

The present invention solves the above-mentioned problems in the conventional cutting technique. In the disking method, a workpiece having an internal distortion does not need to be subjected to a heat treatment or the like, and the weight accuracy and the surface quality are the same as the conventional one. Provided is a side pressure cutting device that can obtain an optical element material and can obtain a quality stable optical element material while maximizing the life of each consumable member for continuous cutting.

[0018]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a lateral pressure cutting device according to the present invention has a distortion detecting means for partially measuring the internal distortion of a workpiece, and further comprises a distortion detecting means. The tool has a striation load calculating means, a cutting pressure calculating means, a boosting time calculating means, or a fitting distance calculating means which can be adjusted according to the amount of distortion detected by the above method. It is characterized in that it enables cutting equivalent to a workpiece without distortion even on a workpiece, and reproduces an optimal cutting process for cutting a workpiece.

As described above, in the disking method, an optical element material having the same weight accuracy and surface quality as the conventional one can be obtained without the need for heat treatment or the like even for a workpiece in which internal distortion has occurred. An optical element material which is stable in quality while maximizing the life of the member can be obtained.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lateral pressure cutting device according to a first aspect of the present invention is based on a lateral pressure cutting method utilizing material destruction due to lateral pressure on a material, and cuts an outer peripheral surface of a workpiece to be cut. In a side pressure cutting device that cuts the work piece along the streak by providing a streak corresponding to the position and applying a side pressure to the work piece,
The workpiece is a bar-shaped workpiece having irregular distortion in the length direction, and the workpiece is based on video information having information on the distortion obtained by imaging means by making the distortion of the workpiece visible. A strain detecting means for calculating the amount of strain for each part, and calculating a striation load by an indenter for providing the striation on each part of the workpiece according to the strain amount determined by the strain detecting means. And a streak load calculating means for performing the streak load, wherein the streak load is changed to a streak load calculated for each part of the workpiece by the streak load calculating means in accordance with a position of the streak load. A streak load varying means, wherein the indenter stress-cuts the workpiece provided with the streak by the indenter with the streak load varied by the streak load varying means.

According to this configuration, the amount of internal strain of the workpiece is determined, and the distribution of the internal strain of the workpiece is examined while
The load on the streak can be changed in accordance with the difference in the amount of distortion.

According to a second aspect of the present invention, there is provided a lateral pressure cutting apparatus, wherein a striation is formed on an outer peripheral surface of a workpiece to be cut in accordance with a cutting position based on a lateral pressure cutting method utilizing material destruction by lateral pressure on a material. A lateral pressure cutting device for applying a lateral pressure to the workpiece to cut the workpiece along the streak, wherein the workpiece is a bar-shaped workpiece having irregular distortion in the length direction. A distortion detecting means for determining the amount of distortion for each part of the workpiece based on video information having the information of the distortion obtained by the imaging means so that the distortion of the workpiece can be viewed; Cutting pressure calculating means for calculating a lateral pressure value at the time of cutting, according to a total distortion amount at a cutting position obtained based on the distortion amount determined by the distortion detecting means, and a lateral pressure value at the time of cutting As the cutting pressure acting And a cutting pressure varying means for varying the lateral pressure value calculated by means by a variable has been side pressure value in the cutting pressure varying means, a configuration in which the stress cut a workpiece provided with the striations.

According to this configuration, the amount of internal strain of the workpiece is determined, and the distribution of the internal strain of the workpiece is examined,
It is possible to adjust the pressure in the pressure chamber in accordance with the total amount of distortion at the cutting position.

According to a third aspect of the present invention, there is provided a lateral pressure cutting device, wherein a striation corresponding to a cutting position is formed on an outer peripheral surface of a workpiece to be cut based on a lateral pressure cutting method utilizing material destruction due to lateral pressure on a material. A lateral pressure cutting device for applying a lateral pressure to the workpiece to cut the workpiece along the streak, wherein the workpiece is a bar-shaped workpiece having irregular distortion in the length direction. A distortion detecting means for determining the amount of distortion for each part of the workpiece based on video information having the information of the distortion obtained by the imaging means so that the distortion of the workpiece can be viewed; A boosting time calculating means for calculating a boosting time of a lateral pressure value at the time of cutting, according to a total strain amount at a cutting position obtained based on the strain amount determined by the strain detecting means; Of the lateral pressure value of Means for changing the side pressure value calculated by the step-up time calculating means. The workpiece provided with is stress cut.

According to this configuration, the amount of internal strain of the workpiece is determined, and while the distribution of the internal strain of the workpiece is examined,
It is possible to change the boosting time up to the set pressure according to the total distortion amount at the cutting position.

According to a fourth aspect of the present invention, there is provided a lateral pressure cutting device, wherein a striation corresponding to a cutting position is formed on an outer peripheral surface of a workpiece to be cut based on a lateral pressure cutting method utilizing material destruction by lateral pressure on a material. A lateral pressure cutting device for applying a lateral pressure to the workpiece to cut the workpiece along the streak, wherein the workpiece is a bar-shaped workpiece having irregular distortion in the length direction. A bar-shaped metal member having an outer diameter equivalent to that of the workpiece, the bar-shaped metal member being arranged at at least one end of the workpiece to adjust a range of applying a lateral pressure to the workpiece, and the workpiece and the bar-shaped metal member. A lateral pressure transmission cylinder that covers the outer peripheral surfaces thereof and transmits the lateral pressure;
Based on the video information having the information of the distortion obtained by the imaging means to make the distortion of the workpiece visible,
A strain detecting means for calculating an amount of strain for each part of the workpiece; and a fitting distance of the rod-shaped metal member in the side pressure transmitting cylinder is calculated according to the strain amount determined by the strain detecting means. Fitting distance calculating means and a fitting for moving and adjusting the rod-shaped metal member to a position which is a fitting distance calculated by the fitting distance calculating means as a fitting distance of the rod-shaped metal member into the side pressure transmitting cylinder. With a matching distance adjusting means, the rod-shaped metal member is moved and adjusted by the fitting distance adjusting means,
The workpiece provided with the streak is subjected to stress cutting.

According to this configuration, the amount of internal strain of the workpiece is determined, and while the distribution of the internal strain of the workpiece is examined,
It is possible to change the setting distance of the rod-shaped metal member according to the total distortion amount at the cutting position.

According to a fifth aspect of the present invention, there is provided a lateral pressure cutting device, wherein a striation corresponding to a cutting position is formed on an outer peripheral surface of a workpiece to be cut based on a lateral pressure cutting method utilizing material destruction due to lateral pressure on a material. A lateral pressure cutting device for applying a lateral pressure to the workpiece to cut the workpiece along the streak, wherein the workpiece is a bar-shaped workpiece having irregular distortion in the length direction. A distortion detecting means for determining the amount of distortion for each part of the workpiece based on video information having the information of the distortion obtained by the imaging means so that the distortion of the workpiece can be viewed; According to the amount of strain determined by the strain detecting means, a mark load calculating means for calculating a mark load by an indenter for forming the marks on each part of the workpiece, and providing the marks. , That much Depending on the, as the striations load,
A streak load varying unit that changes to a streak load calculated for each part of the workpiece by the streak load calculating unit, and a cutting position obtained based on the strain amount calculated by the strain detecting unit. Cutting pressure calculating means for calculating a lateral pressure value at the time of cutting in accordance with the total distortion amount; and cutting pressure variable means for varying the lateral pressure value at the time of cutting to the lateral pressure value calculated by the cutting pressure calculating means. And a structure in which a workpiece provided with a streak is stress-cut by the indenter by a streak load changed by the streak load changing means by a lateral pressure value changed by the cutting pressure changing means.

According to this configuration, the amount of internal strain of the workpiece is determined, and while checking the internal strain of the workpiece, the load of the striation is changed according to the difference in the amount of distortion, and the pressure in the pressure chamber is adjusted. It becomes possible.

According to a sixth aspect of the present invention, there is provided a lateral pressure cutting device, wherein a striation corresponding to a cutting position is formed on an outer peripheral surface of a workpiece to be cut based on a lateral pressure cutting method utilizing material destruction due to lateral pressure on a material. A lateral pressure cutting device for applying a lateral pressure to the workpiece to cut the workpiece along the streak, wherein the workpiece is a bar-shaped workpiece having irregular distortion in the length direction. A distortion detecting means for determining the amount of distortion for each part of the workpiece based on video information having the information of the distortion obtained by the imaging means so that the distortion of the workpiece can be viewed; According to the amount of strain determined by the strain detecting means, a mark load calculating means for calculating a mark load by an indenter for forming the marks on each part of the workpiece, and providing the marks. , That much Depending on the, as the striations load,
A streak load varying unit that changes to a streak load calculated for each part of the workpiece by the streak load calculating unit, and a cutting position obtained based on the strain amount calculated by the strain detecting unit. In accordance with the total distortion amount, the boosting time calculating means for calculating the boosting time of the lateral pressure value at the time of cutting, and the boosting time of the lateral pressure value at the time of cutting, as the boosting time of the lateral pressure value calculated by the boosting time calculating means A pressurizing time variable means for changing the pressurizing time, the side pressure value is raised by the pressurizing time varied by the pressurizing time variable means, and The structure provided with the streak is stress cut.

According to this configuration, the amount of internal strain of the workpiece is determined, and while examining the internal strain of the workpiece, the load on the striations 2 is changed depending on the difference in the amount of strain, and the time required to increase the pressure to the set pressure is obtained. Can be changed.

According to the above configuration, in the disking method, even a workpiece having internal distortion can be cut as well as a workpiece without distortion, and the optimum cutting process for cutting the workpiece can be reproduced. Becomes possible.

Hereinafter, a side pressure cutting device according to an embodiment of the present invention will be specifically described with reference to the drawings. (Embodiment 1) FIG. 1 is a view showing a process of varying the load of a streak using a strain tester 15, and FIG. FIG. 3 is a perspective view showing a method of forming the mark 2, FIG. 3 is an overall configuration diagram of the lateral pressure cutting device, and FIG. 4 is a diagram showing an example of a strain amount and a mark load amount for marking the mark 2 on the outer peripheral surface of the workpiece 1. FIG. 3 is a diagram for explaining Embodiment 1 of the present invention.

This side pressure cutting device is used for cutting the bar-shaped workpiece 1. When the workpiece 1 is cut by the side pressure cutting device, as shown in FIG. 2, prior to the cutting, the indenter 21 previously positioned on the cutting position on the outer peripheral surface of the workpiece 1 is used to cut the workpiece 1. Streak 2 for easily inducing cutting on the outer peripheral surface of the cutting position of object 1
Must be provided. The tip shape of the indenter 21 is polished at an arbitrary angle forming a pair.
When the workpiece 1 is brought into contact with the load Wx and the set distance Ly from the vertical direction, the streak 2 is formed locally.

In the process up to the trace load varying means 29 for varying the load on the trace 2 shown in FIG. 1, first, the distortion state of the workpiece 1 observed by the distortion inspection device 15 is measured using a CCD camera or the like. After converting to a video signal, it is divided into luminance levels by the distortion detecting means, and then the notch load of the divided distortion amount and the previously collected distortion amount is calculated by the streak load calculating means. Based on the correlation, the optimum load of the streak 2 at the cutting position is selected, and the information data is sent to the streak load varying means 29, so that the streak 2 corresponding to the individual strain amount of the workpiece 1 is determined. The load can be stamped.

As shown in FIG. 3, the work 1 is fitted into the side pressure transmission tube 3 via the pressure medium 4, and the clearance between the work 1 and the side pressure transmission tube 3 is set to several tens μm. . Pressure seal members 5 are respectively disposed at both ends of the side pressure transmission cylinder 3, and are fitted into the first metal member 6 and the second metal member 7, respectively. In order to increase the airtightness at the time of pressurization, each pressure seal member 5 is deformed under pressure by moving the holding member 8 toward the first metal member 6 by a predetermined distance by the pressure of the hydraulic pump 14.

The pressure seal member 5 is arranged to seal the pressure of the rod-shaped workpiece 1 in the axial direction and the pressure of the rod-shaped workpiece 1 in the radial direction. In such a state, the outer peripheral surface of the side pressure transmission cylinder 3 and the pressure vessel 10 in a section sandwiched by the pair of pressure seal members 5 fitted via the first metal member 6 and the second metal member 7.
Is sealed to form a pressure chamber 9. Then, by flowing the working oil 18 from the pressure (oil pressure) generator 12 into the pressure chamber 9 of the pressure vessel 10 via the pressure raising line 11, a uniform lateral pressure 17 can be applied to the outer peripheral surface of the workpiece 1.

Pressure generator 1 for applying lateral pressure 17
2 is a hydraulic pump 14 and an intensifier 13 as shown in FIG.
The hydraulic pump 14 not only generates a force for holding the holding member 8 in the pressure vessel 10 but also has a function as a prime mover of the pressure intensifier 13.

Hereinafter, specific conditions in the side pressure cutting device according to the first embodiment will be described. The workpiece 1 of this example is a solid cylindrical optical glass rod having a Young's modulus of 8.2 × 10 ³ kgf / mm ² and an outer diameter of about 11 mm, and is used for lens molding. Eight streaks 2 for designating a cut surface on the workpiece 1 were provided at equal intervals of 3 mm in the axial direction of the outer peripheral surface.

In the workpiece 1 in which the internal distortion has occurred, the load Wx = 1000 g and the striations 2 are uniformly distributed as in the case of the workpiece 1 having no distortion.
Was engraved. The length of the imprinted streak 2 is about 400 μm, regardless of the presence or absence of distortion, and all eight locations have the same shape.

The engraved workpiece 1 is fitted into a hollow cylinder-shaped side pressure transmission cylinder 3 made of methacrylic resin. As the pressure medium 4 sealed between the workpiece 1 and the side pressure transmission cylinder 3, a known high-viscosity oil or fat was used. The Young's modulus of the methacrylic resin that is the material of the side pressure transmission cylinder 3 is 3.1 kgf / mm ² . Further, the length of the side pressure transmission cylinder 3 is set to about 20 mm, and the pressure seal member 5 is
A ring-shaped rubber having a wire diameter of 1.2 mm, and
And a predetermined position of the second metal member 7.

The holding member 8 is moved by about 1 mm toward the first metal member 6 under the pressure of the hydraulic pump 14 and pressed against the second metal pressure member, so that each pressure seal member 5 is compressed and deformed. Thus, the airtightness in the pressure chamber 9 is increased. Carbon tool steel was used as the material of the first metal member 6 and the second metal member 7. Further, the clearance accuracy of the inner diameter between the workpiece 1 and the first metal member 6 or the second metal member 7 is finished so as to be substantially the same as the clearance accuracy of the side pressure transmission cylinder 3.

Under the above cutting conditions, the lateral pressure 17 is P = 8.5 kgf / mm ² , the boosting time is 5 sec., And the set holding time is 3 sec.
When operated as c., cutting of the distorted workpiece 1 cuts all of them without any problem in terms of shape. The result was that only one out of eight optical element materials were generated at one place and obtained as good products.

In addition, with respect to the work 1 having no distortion, the streak 2
When the load Wx = 1500 g was similarly applied, a phenomenon that a shell-like scratch on the cut surface which occurs when an excessive load was applied excessively occurred occurred. As a result, the weight accuracy of the optical element material and the surface quality of the cut surface are reduced.

Therefore, in the first embodiment, the work 1 having the same internal strain as the one used in the above study is applied to the work load calculating means and the work load variable means 29.
The cutting was performed using.

Although the length of the streak 2 varies depending on the set load, the overall shape is almost the same. When the amount of internal strain at the position where these streaks 2 were stamped was measured, the maximum amount was about 100 nm / cm. As a result of detailed analysis, the amount of internal strain at a position 3 mm from one end surface of the workpiece 1 was about 100 nm / cm. At a position of cm and 6 mm, about 50 nm / cm, at a position of 9 mm, about 15 nm / cm, at a position of 12 mm, about 10 nm / cm, and at a position more than 15 mm, internal strain could hardly be measured.

Further, from the examination results of the basic experiment, when the distortion amount is about 10 nm / cm, Wx = 1050 g, when the distortion amount is about 50 nm / cm, Wx = 1300 g,
At about 100nm / cm, apply a load of Wx = 1500g and engrave,
It is known in advance that cutting can be performed without any problem at the same cutting pressure as the workpiece 1 without internal distortion.

From these facts, the load of the streak 2 applied from one end face to the internal strain amount is 1500 g, 1300 g, 1100 g,
g, 1050 g, 1000 g, 1000 g, 1000 g, and 1000 g were set in the order of the marking load calculating means, and marking was performed using the marking load varying means 29.

In such a state, the workpieces 1 having the streaks 2 having different lengths are all set in the side pressure 17 at P = 8.5 kg / mm ² and the pressure increasing time at T = 5 sec. The cutting was reliably performed at all the cross sections passing through the striations 2, and the weight accuracy and the condition of the cut surface were the same as those obtained by cutting the workpiece 1 with almost no distortion.

FIG. 5 shows an optical element 22 formed by performing heating, pressing, and cooling, which are post-processing, on the optical element material obtained by cutting with the side pressure cutting device of the first embodiment. The explanatory view of a processing process is shown. The optical element 22 of this example is used as one of the lenses for a video movie, and has a biconvex shape in which one surface is an aspheric surface and the other surface is a spherical surface. Further, the transfer surfaces of the first molding die 23 and the second molding die 24 used in the molding are each processed into a desired concave shape so as to correspond to the convex shape of each spherical surface of the optical element 22. , Are respectively fitted to the upper and lower inner diameter portions of the body mold 25. The transfer accuracy of the optical element 22 obtained through the molding step was not different from that obtained when the conventional optical element material was molded, and was a performance having no problem in optical characteristics.

In the first embodiment, the resolution of the set load is 50 g. However, as the resolution increases, the quality of the cut optical element material improves. Although the amount of strain and the absolute value of the load on the streak 2 vary depending on the outer diameter and the material of the workpiece 1, the correlation is the same, and the load on the streak 2 can be appropriately selected and set. It is possible. Further, if a material having a Young's modulus on the order of methacrylic resin is used as the material of the side pressure transmitting cylinder 3 to be used, the same effect can be obtained. In addition, other similar means can be adopted for the distortion inspection device 15 and the CCD camera as long as they have the functions described above.

As described above, according to the lateral pressure cutting device of the first embodiment, it is possible to detect the internal distortion of the workpiece 1 that has been irregularly generated in the length direction, and to detect the streak 2 according to the amount of each distortion. , The life of consumable members such as the indenter 21 can be extended to the maximum, and optical element materials that are stable in quality can be obtained. (Embodiment 2) FIG. 6 is a view showing a process until the cutting pressure is varied by a cutting pressure varying means 26 using a distortion inspection device 15, FIG. 7 is an overall configuration diagram of a side pressure cutting device, and FIG. FIG. 9 is a diagram showing a state of occurrence of internal distortion in FIG. 1, and FIG. 9 is a diagram showing a change in cutting pressure, all of which are diagrams for explaining Embodiment 2 of the present invention. Members corresponding to those described with reference to FIGS. 2 and 3 are denoted by the same reference numerals, and detailed description is omitted.

The distortion inspection device 15 according to the second embodiment
Are basically the same as the configuration of the side pressure cutting device of the first embodiment. The difference is that, as shown in FIGS.
The difference is that the streak load varying means 29 has means for finely adjusting the side pressure 17 in the pressure intensifier 13 of the pressure generating device 12 instead of the cutting pressure varying means 26.

Hereinafter, specific conditions in the side pressure cutting device according to the second embodiment will be described. The workpiece 1 used in the study is a solid cylindrical optical glass rod having a Young's modulus of 8.2 × 10 ³ kgf / mm ² and an outer diameter of about 11 mm, which is exactly the same as that used in the first embodiment. . The streaks 2 imprinted on the outer peripheral surface of the workpiece 1 are eight pieces which are assumed to be cut by a single step-up, and are provided at eight places so that the end face is the origin and the set distance Ly is equal to every 3 mm. I have. When the load Wx = 1000 g, the length of the streak 2 is 400 μm, and all have the same shape.

In this state, the lateral pressure 17 becomes P ₁ = 8.5 k
gf / mm ² , the boosting time was T = 5 sec., and the set holding time was 3 sec., the work 1 with no distortion could be cut without any problem in terms of shape, but the work with distortion occurred. As shown in Embodiment 1, the result of the object 1 was that only three out of eight optical element materials were obtained as non-defective products.

Therefore, in the second embodiment, the cutting pressure calculating means and the cutting pressure varying means 26 are used for the workpiece 1 in which the internal distortion similar to that used in the above study has occurred.
The cutting was performed using.

When the side surface of the work 1 having distortion was measured in detail, the situation was as shown in FIG. From this, in the streak portion 28 cut at one time of the workpiece 1,
The area ratio of the internal distortion generating section 27 to the area where there is no distortion was determined using the distortion inspection device 15. The distortion generation area ratio of eight cut portions of the workpiece 1 having the distortion this time was about 30%.

From the results of the basic experiments, it was found that the strain generation area ratio was about
At 30%, the cutting pressure is 1 kgf / mm ²
It is known in advance that when the area ratio is about 50%, the pressure needs to be increased by ² kgf / mm ² from the conventional set pressure.

From these facts, the cutting pressure was increased by 1 kgf / mm ² with respect to the total internal strain of the portion to be cut, the lateral pressure 17 was changed to P ₂ = 9.5 kgf / mm ² , and the other conditions were as follows. When cut under exactly the same conditions, the fitted work 1 is reliably cut in a cross section passing through all the streaks 2, and the weight accuracy and the condition of the cut surface are determined by the work 1 without distortion. The result was the same as that of cutting.

In the second embodiment, if the number of cuts per time changes, the total distortion amount of the cut portion also changes. Therefore, it is necessary to find an optimum cutting pressure for the total distortion amount in advance.

As described above, according to the lateral pressure cutting device of the second embodiment, it is possible to detect the internal distortion of the workpiece 1 which has been irregularly generated in the longitudinal direction, and further, it is possible to detect the entire internal portion of the portion to be cut at one time. By varying the cutting pressure in accordance with the amount of distortion, it is possible to obtain optical element materials that are stable in quality while maximizing the life of consumable members such as the pressure seal member 5, the side pressure transmission cylinder 3, or the indenter 21. It becomes possible. (Embodiment 3) FIG. 10 is a view showing a process until the boosting time is varied by the boosting time varying means 31 using the strain tester 15, FIG. 11 is an overall configuration diagram of the side pressure cutting device, and FIG.
7A and 7B are diagrams showing changes in the boosting time, all of which are diagrams for explaining the third embodiment of the present invention. In the third embodiment, like the second embodiment, the members corresponding to those described with reference to FIGS. 2 and 3 are denoted by the same reference numerals, and detailed description is omitted.

The distortion inspection device 15 according to the third embodiment
Are basically the same as the configuration of the side pressure cutting device according to the first embodiment. The differences are shown in FIGS.
As shown in the figure, the striation load calculating means is replaced with a boosting time calculating means, and the streak load varying means 29 is replaced with a boosting time varying means 31. Is a point.

The specific conditions in the side pressure cutting device according to the third embodiment will be described below. Workpiece 1 used for examination
Is a solid cylindrical optical glass rod exactly the same as that used in the first and second embodiments, and the setting conditions of the streaks 2 stamped on the outer peripheral surface are the same as those in the second embodiment. , Eight locations estimated to be cut by one pressurization.

As shown in the first and second embodiments, the cutting for comparison is performed when the lateral pressure 17 is P = 8.5 kgf / mm.
^{2. Under the condition} that the boosting time was T ₁ = 5 sec. And the set holding time was 3 sec., The number of non-defective products obtained was 3 out of 8.

Therefore, in the third embodiment, the work-up 1 having the internal distortion similar to that used in the above examination is applied to the work-up time calculating means and the work-up time varying means 3.
Cutting was performed using No. 1.

When the workpiece 1 having distortion was measured in detail by using the distortion inspection device 15, distortion as shown in FIG. 8 was observed. As shown in the second embodiment, the distortion generation area ratio was about 30. %.

From the basic experiment results, it is known in advance that when the distortion generation area ratio is about 30%, the boosting time needs to be set to about 1 second, which is 4 seconds earlier than the conventional setting time. From this, the pressure raising time was changed to T ₂ = 1 sec., And the side pressure 17 was P = 8.5 kgf / mm ² , and the set holding time was 3 sec. The cross section passing through the streak 2 was surely cut, and the result that the weight accuracy and the cut surface of each were not different from the workpiece 1 having no internal distortion was obtained.

In the third embodiment, if the number of cuts at one time changes, the total distortion amount of the cut portion also changes. Therefore, it is necessary to find an optimum boosting time for the total distortion amount in advance. As described above, according to the lateral pressure cutting device of the third embodiment, the pressure-up time is adjusted according to the total internal distortion amount of the portion to be cut at one time for the workpiece 1 generated irregularly in the length direction. This makes it possible to obtain optical element materials that are stable in quality while maximizing the life of consumable members such as the pressure seal member 5, the side pressure transmission cylinder 3, and the indenter 21. (Embodiment 4) FIG.
FIG. 4 is a view showing a process until the fitting distance of the rod-shaped metal member 16 shown in FIG. 4 into the side pressure transmission cylinder 3 is adjusted. FIG. 14 is an overall configuration diagram of the side pressure cutting device. It is each figure for demonstrating. Members corresponding to those described with reference to FIGS. 2 and 3 are denoted by the same reference numerals, and detailed description is omitted.

[0069] Strain detector 15 in the fourth embodiment
Are basically the same as the configuration of the side pressure cutting device according to the first embodiment. The differences are shown in FIGS.
As shown in the figure, the streak load calculating means is replaced by the fitting distance calculating means, and the streak load varying means 29 is replaced by the fitting distance adjusting means 30, and the rod-shaped metal member 16 used for regulating the cutting position of the workpiece 1 is used. Is the point having

Hereinafter, specific conditions in the lateral pressure cutting device according to the fourth embodiment will be described. The workpiece 1 used in the study is a solid cylindrical optical glass rod having a Young's modulus of 1.03 × 10 ⁴ kgf / mm ² and an outer diameter of about 7 mm. The streaks 2 provided on the outer peripheral surface of the workpiece 1 are spaced at equal intervals of 3 mm in the axial direction of the outer peripheral surface.
Thirteen locations were provided that could be expected to be cut off by one boost.

In the workpiece 1 in which internal distortion has occurred, the streak 2 is imprinted with a load of about Wx = 1000 g, similarly to the undistorted work 1, and the length of the inscribed streak 2 is about 350 μm.
Thus, all 13 locations have the same shape regardless of the presence or absence of distortion.

The engraved workpiece 1 is fitted into a hollow cylinder-shaped side pressure transmission cylinder 3 having a length of about 40 mm. The other pressure seal members 5, the first metal member 6, and the second metal member 7 have the same action as in the first embodiment, though the diameters are different.

The lateral pressure 17 is applied to the work 1 in which
= 10 kgf / mm ² , and cutting was attempted. However, the cutting properties near the end face of the workpiece 1 were particularly poor, and three out of thirteen cutting portions were generated, and the cutting was not completed.

Therefore, in the fourth embodiment, the fitting distance of the rod-shaped metal member 16 into the side pressure transmission cylinder 3 is calculated for the workpiece 1 having the same internal distortion as that used in the above examination. Cutting was performed using fitting distance calculating means and fitting distance adjusting means 30 for adjusting the fitting distance of the rod-shaped metal member 16 based on the calculation result.

The bar-shaped metal member 16 is disposed such that the end surfaces thereof abut on one end of the workpiece 1 and has an outer diameter similar to that of the workpiece 1 and an appearance similar to that of the workpiece 1, but is a brittle material. This is a member having different properties from the above, and a general metal with high toughness is used. When a lateral pressure 17 is applied to the rod-shaped metal member 16 fitted in the lateral pressure transmission cylinder 3 by a predetermined distance together with the workpiece 1 by hydraulic pressure, the workpiece 1 moves along the cross section where the streak 2 is engraved. Although cut, the rod-shaped metal member 16 does not break.

When the internal strain amount of the workpiece 1 having the same distortion as described above was measured, the area ratio of the 13 strains was about 40% in total, but the area ratio of the strain from the end face to 6 pieces was measured. The area ratio of strain occurrence is 70%, and the same area ratio from 7 to 13 is 1
As a result of 0%, it was clarified by the distortion detecting means that the distortion was concentrated on the end face. As described above, the fitting distance calculating means determines that the number of cuts
And the difference of the area ratio of the strain occurrence by half of the number
It is set to operate only when there is 20% or more.

Further, based on the results of the basic experiment, if the number of pieces cut at one time is reduced, the cutting pressure can be reduced accordingly.
It has been previously known that the cutting pressure required for cutting only individual pieces is about 7.5 kgf / mm ² (other setting conditions are the same as those for cutting 13 pieces).

From these facts, the work 1 having the distortion
Is inserted into the side pressure transmission cylinder 3 by a distance corresponding to the number of cut pieces of the bar-shaped metal member 16, and the side pressure 17 is set to P ′ = 9.0 kgf /
When the pressure was changed to mm ² and the pressurization time was set to 5 seconds and the set holding time was set to 3 seconds, cutting was performed, and all six pieces of the inserted workpiece 1 were reliably cut. Next, the rod-shaped metal member 16 is fitted into the side pressure transmission cylinder 3 by a distance corresponding to seven cut pieces,
When the lateral pressure 17 was changed to P = 8.0 kgf / mm ² and the cutting was attempted under exactly the same conditions, the inserted work 1
Were cut, and the weight accuracy and the surface quality of the obtained 13 optical element materials were not different from the cutting of the workpiece 1 without distortion.

In the fourth embodiment, when cutting a workpiece 1 shorter than the side pressure transmission cylinder 3, bar-shaped metal members 16 are arranged at both ends of the workpiece 1 so that the workpiece 1 is sandwiched. It is also possible to fit in. In addition, if a few uncut workpieces 1 are used, and if there is no large difference between the respective strain generation area ratios, it is also possible to cut the workpiece by applying a boost pressure again. The setting of the fitting distance calculation means can be changed, of course.

As described above, according to the lateral pressure cutting device of the fourth embodiment, for the workpiece 1 in which the distortion is irregularly generated in the length direction, according to the distortion generation area ratio of the portion cut at one time. By adjusting the fitting distance of the rod-shaped metal member 16 into the side pressure transmission cylinder 3, it is possible to obtain optical element materials that are stable in quality. (Embodiment 5) FIG.
FIG. 14 is a diagram showing a process until the cutting pressure by the cutting pressure variable means 26 and the load at the time of providing the streak 2 on the workpiece 1 by the streak load variable means 29 are changed, and a fifth embodiment of the present invention is shown. FIG. Members corresponding to those described with reference to FIGS. 2 and 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0081] Distortion checker 15 in the fifth embodiment
The main configuration such as the strain detecting means using the, the striation stamping process, and the side pressure cutting device is basically the same as the configuration of the side pressure cutting device of the first embodiment. The difference is that, as shown in FIG. 15, the streak load calculating means, the cutting pressure calculating means, the streak load varying means 29, and the intensifier 13 of the pressure generating device 12 shown in FIG.
This is the point that each component of the cutting pressure variable means 26 corresponding to the means for finely adjusting the inside is simultaneously provided.

Hereinafter, specific conditions in the lateral pressure cutting device according to the fifth embodiment will be described. The workpiece 1 used in the study is a solid cylindrical optical glass rod having a Young's modulus of 1.03 × 10 ⁴ kgf / mm ² and an outer diameter of about 7 mm, which is exactly the same as that described in the fourth embodiment. As in the fourth embodiment, 13 streaks 2 are formed on the outer peripheral surface of the workpiece 1 at regular intervals of 3 mm corresponding to the number of cuts that can be expected to be cut by one step-up.

In the workpiece 1 in which internal distortion has occurred, similarly to the workpiece 1 having no distortion, the streak 2 is stamped with a load of Wx = 1000 g, and the length of the stamped streak 2 is about 350 μm.
And all 13 locations have the same shape.

The engraved workpiece 1 is fitted into a prescribed position of the side pressure transmission cylinder 3 having a hollow cylindrical shape. For the strained workpiece 1, P = 8.5 kgf / mm ² as the side pressure 17 which is similar to that of the undistorted workpiece 1, the pressure rise time is T = 5 sec.
Cutting was attempted with the set holding time of 3 sec., But none of the 13 cuts were cut.

When the amount of internal strain at the position where these streaks 2 were stamped was measured, the maximum amount was about 150 nm / cm. As a result of detailed analysis, the amount of internal strain at a position 3 mm from one end face of the workpiece 1 was About 110 nm / cm, about 80 nm / cm at 6 mm, about 60 nm / cm at 9 mm, about 40 nm / cm at 12 mm, about 20 nm / cm at 15 mm, about 10 nm / cm at 18 mm, At a position of 21 mm or more, the internal strain was hardly measurable. Further, the total strain generation area ratio of 13 workpieces 1 was about 60%.

Also, from the results of the basic experiment, when the amount of internal strain at a position 3 mm from one end surface of the workpiece 1 is about 10 nm / cm, Wx = 1.
100g, about 20nm / cm Wx = 1200g, about 40nm / cm Wx = 1
300g, about 60nm / cm Wx = 1400g, about 80nm / cm Wx = 1
It has been found in advance that, when a load of Wx = 1700 g is applied at 550 g and about 110 nm / cm and a streak 2 is imprinted, the workpiece 1 can be cut at the same cutting pressure as the workpiece 1 having no internal distortion.

The above experimental results were obtained when the lateral pressure 17 was 8.5 kgf / mm ^{2. As} a result of examining the case where the lateral pressure 17 was increased to 9.5 kgf / mm ² , it was found that the amount of distortion was about 40 nm / cm or less. Has revealed that it is not necessary to increase the streak load when the streak 2 is provided. That is, when the lateral pressure 17 is set to be higher than the set value by 1 kgf / mm ² , the required streak load can be reduced by about 300 g with respect to the strain amount described in the fifth embodiment.

In this state, the applied streak load is
1400g, 1250g, 1100g, 1 from one end face for internal strain
000g, below 1000g, equal load setting, lateral pressure 17 is 9.5kg
f / mm ^TwoThe pressurizing time is about 5 sec.
All cross-sections through all streaks 2 are reliably cut,
The weight accuracy and surface quality are the same as the undistorted workpiece 1.
No results were obtained.

In the fifth embodiment, the work 1
Depending on the outer diameter and the material of the material, the absolute value of the striation load and the cutting pressure with respect to the strain amount changes, but their correlation is the same. After selecting the cutting pressure appropriately, set the adjustment of the striation load. It is also possible.

As described above, according to the lateral pressure cutting device of the fifth embodiment, it is possible to detect the internal distortion of the workpiece 1 that has occurred irregularly in the longitudinal direction, and to detect the streak 2 according to the amount of each distortion. By changing the load and the cutting pressure at the time of providing, the life of a consumable member such as the pressure seal member 5, the side pressure transmission cylinder 3, or the indenter 21 is maximized, and the optical element material that is stable in quality is formed. It is possible to obtain. (Embodiment 6) FIG.
FIG. 9 is a diagram illustrating a process of varying the load when the streak 2 is provided by the streak load varying unit 29 and the boosting time by the boosting time varying unit 31, for explaining the sixth embodiment of the present invention. It is. Members corresponding to those described with reference to FIGS. 2 and 3 are denoted by the same reference numerals, and detailed description is omitted.

[0091] Distortion checker 15 in the sixth embodiment
The main configuration such as a strain detection unit using a sword, a streak load variable unit 29, and a side pressure cutting device is basically the same as the configuration of the side pressure cutting device of the first embodiment. The difference is that, as shown in FIG. 16, the streak load calculating means, the boosting time calculating means, the streak load varying means 29, and the means for finely adjusting the side pressure 17 in the pressure intensifier 13 of the pressure generator 12 shown in FIG. The point is that it has a corresponding boost time varying means 31.

Hereinafter, specific conditions in the lateral pressure cutting device according to the sixth embodiment will be described. The workpiece 1 used for the study was a solid cylindrical optical glass rod exactly the same as that used in the fifth embodiment, and a streak 2 stamped on the outer peripheral surface.
In the condition (1), the number of cuts in one pressurization is 13 places.

Embodiment 5 shows a process in which, in the workpiece 1 in which internal distortion has occurred, all the 13 pieces have not been cut as a result of cutting the workpiece 1 without distortion. As for the workpiece 1 in which the internal distortion has occurred, the same distortion generating area ratio as that of the fifth embodiment is selected, which has a total distortion generation area ratio of about 60% for 13 pieces.

From the results of the basic experiment, the lateral pressure 17 was 8.5 kgf / m
In the case of m ^2, the boosting time 5 sec., when the set configuration retention time as 3sec., although the load of the striations 2 required for the amount of distortion corresponding to 110 nm / cm becomes necessary 1700 g, When the boosting time was set to 1 sec., It was found that the required load of the streak 2 at the same strain amount was 1500 g.

In such a state, with respect to the amount of internal distortion,
The applied load of streak 2 is 1500g, 1350g, 1200 from one end face
g, 1100g, below 1000g, and lateral pressure 17 is 8.5kg
f / mm ^Two, Boost time is 1sec., Setting hold time is 3sec.
Under the conditions, the side through which all the streaks 2 of the inserted workpiece 1 pass
The cross section is reliably cut, and the weight accuracy and surface quality of each
The result was the same as that of the pure work 1.

In the sixth embodiment, the workpiece 1
Depending on the outer diameter and material of the material, the absolute value of the strain load and the cutting pressure with respect to the amount of strain changes, but their correlation is the same. It is also possible.

As described above, according to the lateral pressure cutting device of the sixth embodiment, it is possible to detect the internal distortion of the workpiece 1 that has occurred irregularly in the longitudinal direction, and to detect the streak 2 according to the amount of distortion. By changing the load at the time of providing the pressure and the step-up time, the life of consumable members such as the pressure seal member 5, the side pressure transmission cylinder 3, or the indenter 21 can be maximized, and the optical element materials that are stable in quality can be formed. It is possible to obtain.

[0098]

As described above, according to the first aspect of the present invention, the amount of internal strain of a workpiece is determined, and the distribution of the internal strain of the workpiece is examined, and the distribution of the internal strain is determined according to the difference in the amount of distortion. The load of the streak can be changed.

According to the second aspect of the present invention, the amount of internal strain of the workpiece is determined, and the distribution of the internal strain of the workpiece is examined, and the pressure in the pressure chamber is determined according to the total amount of strain at the cutting position. Can be adjusted respectively.

According to the third aspect of the present invention, the amount of internal strain of the workpiece is determined, and the distribution of the internal strain of the workpiece is examined to determine the internal strain of the workpiece. The boost time can be changed.

According to the fourth aspect of the present invention, the amount of internal strain of the workpiece is determined, and the distribution of the internal strain of the workpiece is examined. The setting distance can be changed.

According to the fifth aspect of the present invention, the amount of internal strain of the workpiece is determined, and while checking the internal strain of the workpiece, the load of the streak is changed according to the difference in the amount of distortion.
Further, the pressure in the pressure chamber can be adjusted.

According to the sixth aspect of the present invention, the amount of internal strain of the workpiece is determined, and while checking the internal strain of the workpiece, the load of the streak 2 is changed according to the difference in the amount of distortion. The time for raising the pressure to the set pressure can be changed.

As described above, in the disking method in which cutting does not involve cutting chips or noise and unnecessary time and energy are unnecessary, a plurality of specified cuttings can be reliably performed only by applying one side pressure. Thus, even a workpiece with internal distortion can be cut as well as a workpiece without distortion, and a cutting process optimal for cutting the workpiece can be reproduced.

As a result, an optical element material having the same weight accuracy and surface quality as the conventional one can be obtained without the need for heat treatment even for a workpiece having internal distortion, and the life of each consumable member can be maximized with respect to continuous cutting. It is possible to obtain a stable optical element material while maximizing the quality. Therefore, the overall yield can be improved.

[Brief description of the drawings]

FIG. 1 is a process diagram for explaining a lateral pressure cutting device according to a first embodiment of the present invention.

FIG. 2 is an explanatory view of a striation load device according to the first embodiment.

FIG. 3 is a configuration diagram of a side pressure cutting device according to the first embodiment.

FIG. 4 is a correlation diagram between a strain amount and a streak load in Embodiment 1;

FIG. 5 is an explanatory diagram of a process of manufacturing an optical element using the optical element material obtained by the lateral pressure cutting according to the first embodiment.

FIG. 6 is a process diagram illustrating a lateral pressure cutting device according to a second embodiment of the present invention.

FIG. 7 is a configuration diagram of a side pressure cutting device according to the second embodiment.

FIG. 8 is a diagram showing a state of occurrence of distortion of the workpiece detected by the distortion inspection device according to the second embodiment.

FIG. 9 is a dynamic behavior diagram of a cutting pressure in the second embodiment.

FIG. 10 is a process diagram for explaining a lateral pressure cutting device according to a third embodiment of the present invention.

FIG. 11 is a configuration diagram of a side pressure cutting device according to the third embodiment.

FIG. 12 is a dynamic behavior diagram of a boosting time in Embodiment 3;

FIG. 13 is a process diagram illustrating a lateral pressure cutting device according to a fourth embodiment of the present invention.

FIG. 14 is a configuration diagram of a side pressure cutting device according to the fourth embodiment.

FIG. 15 is a process diagram illustrating a lateral pressure cutting device according to a fifth embodiment of the present invention.

FIG. 16 is a process diagram illustrating a lateral pressure cutting device according to a sixth embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 workpiece 2 streak 3 side pressure transmission cylinder 4 pressure medium 5 pressure seal member 6 first metal member 7 second metal member 8 holding member 9 pressure chamber 10 pressure vessel 11 boost line 12 pressure generator 13 intensifier 14 hydraulic pressure Pump 15 Distortion inspector 16 Rod-shaped metal member 17 Side pressure 18 Hydraulic oil 21 Indenter 22 Optical element 23 First molding die 24 Second molding die 25 Body die 26 Cutting pressure variable means 27 Internal distortion generating part 28 Cut at one time Streak portion 29 Streak load varying means 30 Fitting distance adjusting means 31 Step-up time varying means

Claims (6)

[Claims] According to a lateral pressure cutting method utilizing material destruction due to lateral pressure on a material, a streak is provided on an outer peripheral surface of a workpiece to be cut in accordance with the cutting position, and a lateral pressure is applied to the workpiece. In addition, in the lateral pressure cutting device that cuts the workpiece along the streak, the workpiece is a bar-shaped workpiece having irregular distortion in a length direction, and the distortion of the workpiece is reduced. Based on the video information having the information on the distortion obtained by the imaging means by making it possible to visually check the amount of distortion for each part of the workpiece, and the distortion detected by the distortion detection means. According to the amount of strain, a mark load calculating means for calculating a mark load by an indenter for providing the marks on each part of the workpiece, and in providing the marks, according to the position thereof,
A streak load varying unit that changes the streak load to a streak load calculated for each part of the workpiece by the streak load calculating unit, wherein the streak changed by the streak load variable unit A side pressure cutting device characterized in that a workpiece provided with a streak is stress-cut by the indenter by a load. 2. A striation is provided on an outer peripheral surface of a workpiece to be cut in accordance with a cutting position based on a lateral pressure cutting method utilizing material destruction due to lateral pressure on a material, and a lateral pressure is applied to the workpiece. In addition, in the lateral pressure cutting device that cuts the workpiece along the streak, the workpiece is a bar-shaped workpiece having irregular distortion in a length direction, and the distortion of the workpiece is reduced. Based on the video information having the information on the distortion obtained by the imaging means by making it possible to visually check the amount of distortion for each part of the workpiece, and the distortion detected by the distortion detection means. In accordance with the total distortion amount at the cutting position obtained based on the distortion amount, a cutting pressure calculating means for calculating a lateral pressure value at the time of the cutting, and as the lateral pressure value at the time of the cutting, calculated by the cutting pressure calculating means. To the specified lateral pressure value With a cutting pressure variable means that changes, by the side pressure value changed by the cutting pressure variable means,
A side pressure cutting device, wherein the workpiece provided with the streak is stress-cut. 3. A striation is provided on an outer peripheral surface of a workpiece to be cut in accordance with a cutting position based on a lateral pressure cutting method utilizing material destruction due to lateral pressure on a material, and a lateral pressure is applied to the workpiece. In addition, in the lateral pressure cutting device that cuts the workpiece along the streak, the workpiece is a bar-shaped workpiece having irregular distortion in a length direction, and the distortion of the workpiece is reduced. Based on the video information having the information on the distortion obtained by the imaging means by making it possible to visually check the amount of distortion for each part of the workpiece, and the distortion detected by the distortion detection means. According to a total distortion amount of the cutting position obtained based on the distortion amount, a boosting time calculating means for calculating a boosting time of the lateral pressure value at the time of the cutting, and as a boosting time of the lateral pressure value at the time of the cutting, By the boost time calculation means Comprising a boosting time varying means that varies the boosting time of the calculated lateral pressure value, boosting the lateral pressure value by the boosting time varied by the boosting time variable means,
A side pressure cutting device, wherein the workpiece provided with the streak is stress-cut. 4. Based on a lateral pressure cutting method utilizing material destruction due to lateral pressure on a material, a streak is provided on an outer peripheral surface of a workpiece to be cut in accordance with the cutting position, and a lateral pressure is applied to the workpiece. In addition, in the lateral pressure cutting device for performing stress cutting of the workpiece along the streak, the workpiece is a bar-shaped workpiece having irregular distortion in a length direction, and the lateral pressure is applied to the workpiece. A rod-shaped metal member having an outer diameter equivalent to that of the workpiece, which is disposed at least at one end of the workpiece to adjust the pressing range of the workpiece and the workpiece and the rod-shaped metal member, the outer peripheral surfaces thereof are A side pressure transmitting cylinder for transmitting the side pressure, and the distortion of each part of the workpiece based on video information having information on the distortion obtained by an imaging unit by making the distortion of the workpiece visible. Strain detector to determine the amount A step, fitting distance calculating means for calculating a fitting distance of the rod-shaped metal member into the side pressure transmitting cylinder in accordance with the amount of distortion determined by the distortion detecting means, and lateral pressure transmission of the rod-shaped metal member. A fitting distance adjusting means for moving and adjusting the rod-shaped metal member at a position corresponding to the fitting distance calculated by the fitting distance calculating means as a fitting distance into the cylinder; Wherein the bar-shaped metal member is moved and adjusted so as to stress-cut the workpiece provided with the streak. 5. A streak corresponding to a cutting position is provided on an outer peripheral surface of a workpiece to be cut based on a lateral pressure cutting method utilizing material destruction due to a lateral pressure on a material, and the lateral pressure is applied to the workpiece. In addition, in the lateral pressure cutting device that cuts the workpiece along the streak, the workpiece is a bar-shaped workpiece having irregular distortion in a length direction, and the distortion of the workpiece is reduced. Based on the video information having the information on the distortion obtained by the imaging means by making it possible to visually check the amount of distortion for each part of the workpiece, and the distortion detected by the distortion detection means. According to the amount of strain, a mark load calculating means for calculating a mark load by an indenter for providing the marks on each part of the workpiece, and in providing the marks, according to the position thereof,
As the streak load, based on the streak load variable means that is changed to the streak load calculated for each part of the workpiece by the streak load calculation means, and the strain amount calculated by the strain detection means Depending on the total distortion amount of the cutting position obtained by
Cutting pressure calculating means for calculating the lateral pressure value at the time of cutting,
A cutting pressure varying means that varies to a lateral pressure value calculated by the cutting pressure calculating means as the lateral pressure value at the time of cutting, wherein the lateral pressure value varied by the cutting pressure varying means, A side pressure cutting device characterized in that a workpiece provided with a streak is stress-cut by the indenter by a streak load changed in (1). 6. A streak corresponding to a cutting position is provided on an outer peripheral surface of a workpiece to be cut based on a lateral pressure cutting method utilizing material destruction due to a lateral pressure on a material, and the lateral pressure is applied to the workpiece. In addition, in the lateral pressure cutting device that cuts the workpiece along the streak, the workpiece is a bar-shaped workpiece having irregular distortion in a length direction, and the distortion of the workpiece is reduced. Based on the video information having the information on the distortion obtained by the imaging means by making it possible to visually check the amount of distortion for each part of the workpiece, and the distortion detected by the distortion detection means. According to the amount of strain, a mark load calculating means for calculating a mark load by an indenter for providing the marks on each part of the workpiece, and in providing the marks, according to the position thereof,
As the streak load, based on the streak load variable means that is changed to the streak load calculated for each part of the workpiece by the streak load calculation means, and the strain amount calculated by the strain detection means Depending on the total distortion amount of the cutting position obtained by
A boosting time calculating means for calculating a boosting time of the lateral pressure value at the time of cutting; and a boosting time variable as a boosting time of the lateral pressure value calculated by the boosting time calculating means as a boosting time of the lateral pressure value at the time of cutting. A workpiece provided with a variable means, wherein the lateral pressure value is increased by the pressure increasing time varied by the pressure increasing time varying means, and a striation is provided by the indenter by the striation load varied by the striation load varying means. Side pressure cutting device, characterized in that the pressure cutting is performed by stress cutting.