JP2002348139A - Calculating method for quantity of object for inspection and acceptance of intermediate work including part not guaranteeing quality - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of calculating the quantity of the objects for inspection and acceptance with respect to intermediate works which include parts that are not the objects of quality guarantee, which are delivered to processors without being cut apart so that the yield of the intermediate works is enhanced and their productivity is not lowered. SOLUTION: The method comprises a step for storing, into a storing means of a computer, basic data such as the position, the dimension, the weight of the part, of an intermediate work delivered to processors, that is not the object for quality guarantee, a step for calculating inspection and acceptance data such as the quantity of the objects for inspection and acceptance with an arithmetic means of the computer, using the basic data and a computing formula previously stored in the storing means, a step for storing the inspection and acceptance data into the storing means, and a step for outputting, from an outputting means of the computer, the inspection and acceptance data and the position data of the part that is not the object for quality guarantee.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a part of a semi-finished product which is not subject to quality assurance (hereinafter, simply referred to as "product") when an intermediate processed product produced by a material supplier is processed by a processor to produce a product. (Parts not covered by quality assurance) without removing them, and deliver them to the processor as it is, and also accurately calculate the amount of the inspection target that allows the intermediate product to be inspected accurately.

[0002]

2. Description of the Related Art Conventionally, a material supplier prepares an intermediate processed product and delivers the intermediate processed product to the processor, and the processor further processes the intermediate processed product to produce a final product. Is being done.

For example, when an optical fiber is a product, a material supplier manufactures a preform for the optical fiber,
A processor manufactures an optical fiber product. The optical fiber preform, a core portion,
A glass rod having a refractive index distribution and a core / cladding ratio that is made of a clad part having a lower refractive index than the core part and is processed into a required optical fiber when processed into a product optical fiber. And a predetermined length (for example, about 1 m) and an outer diameter (for example, 30 to 100 mm)
To the extent). The optical fiber can be manufactured by drawing an optical fiber preform to a diameter of, for example, 125 μm using a drawing apparatus.

[0004] When a characteristic defect occurs in the intermediate processed product, depending on the content and the degree of the characteristic defect, it is conceivable that a processing defect may result in a product defect when processed by a processor. Therefore, the reference value of the characteristic value of the intermediate processed product that does not cause product failure is determined, and the part exceeding this reference value is cut off from the intermediate processed product by the material supplier as a part not covered by quality assurance, and then We are going to ship.

For example, when the intermediate product is the optical fiber preform, air bubbles may remain in the preform, and the optical fiber is manufactured by drawing the preform containing such air bubbles. In such a case, it is considered that there is no particular problem since small-sized bubbles diffuse and disappear. On the other hand, if the air bubbles are large, the air bubbles cannot be diffused completely from the preform to the optical fiber, or the expansion action is stronger than the diffusion action, causing the outer diameter fluctuation or breakage of the optical fiber. It is also conceivable. Therefore, at the stage of the optical fiber preform, it is necessary to cut and remove a portion containing large-sized air bubbles in advance and ship it to a processor.

[0006] However, in the case of cutting off the part not subject to quality assurance from the intermediate processed product by a flame burner or the like, the part is cut not only over the part not subject to quality assurance but also over a wide area around the outside part of the quality assurance. As a result, the yield of intermediate processed products is reduced. In addition, since the cut preforms outside the quality assurance target are shortened, the frequency of setting the intermediate processed product increases, and the number of parts that do not become products at the start and end of processing increases. In addition, the working efficiency of the processing is reduced. Then, if one intermediate product is cut in the middle to remove the parts that are not covered by the quality assurance, the size of each intermediate product becomes smaller, and the size and weight of the intermediate product required by the processor are reduced. May not. Alternatively, the dimensions and weight of the intermediate processed product shipped to the processor will be biased toward the smaller one within the range required by the processor, and the processor will set up and start up the intermediate processed product into a product The time and labor required for the production increases, and the production efficiency of the product decreases.

[0007]

SUMMARY OF THE INVENTION Accordingly, the present invention solves the above-mentioned problems, improves the yield of an intermediate processed product, does not reduce the production efficiency of the intermediate processed product, and does not cut off the intermediate processed product on the way. The purpose of the present invention is to provide a method for calculating the inspection target amount for intermediate processed products including parts not subject to quality assurance to be delivered to a processor.

[0008]

According to the present invention, in order to achieve the above object, a material supplier delivers an intermediate product of a product to a processor, and the processor manufactures the product by processing the intermediate product. When processing the intermediate processed product into a product by the processor, the intermediate processed product including a part not covered by the quality assurance which is expected to be likely to not have the desired product characteristics may be obtained. A method for calculating the quantity of intermediate processed products including parts not subject to quality assurance to be delivered to a processor, which is to be delivered to the processor, wherein at least one of the dimensions and weight of the intermediate processed product delivered to the processor is included in the intermediate processed product. At least one of the position, size and / or weight of the outside part subject to quality assurance and the size and / or weight of the normal part located around this outside part of quality assurance and excluded from inspection. Storing basic data including at least one of an amount per unit size and an amount per unit weight of an intermediate product in a storage unit of a computer; and calculating the basic data and the following stored in the storage unit in advance. Using a formula, a step of calculating at least one of the inspection target amount and the inspection amount of the intermediate processed product by the arithmetic means of the computer, and storing the inspection data in the storage means; and Outputting the position data of the quality assurance target outside from the output means of the computer. R = T-(X + L) where R is the quantity of the intermediate processed product to be accepted, T is the total amount of the intermediate processed product delivered, X is the quantity of the intermediate processed product outside the quality assurance target, and L is the intermediate processed product This is the amount of normal parts around the outside of the quality assurance target excluded from the inspection target.

[0009] This calculation method is based on the assumption that the quality of the intermediate processed product, which is not expected to satisfy the product standard even when processed by the processor, is not covered by the quality assurance, and the normal range of a certain range located around the outside of the quality assurance target. In this method, the amount obtained by subtracting the part from the total amount of processed intermediate products is used as the inspection target amount. The values of X and L can be appropriately determined according to the type of the intermediate processed product or the product, and the quality assurance ability of the material supplier or the processor. According to the above calculation method, even when the intermediate processed product includes a part not covered by the quality assurance, the intermediate processed product can be shipped to the processor without removing the part not covered by the quality assurance, and is subject to inspection. Quantity and price can be easily and reliably calculated.

Accordingly, it is possible to save time and labor for cutting off the intermediate processed product and to improve the yield of the intermediate processed product. Further, the material supplier does not need to stop the production line of the intermediate processed product for cutting off the part outside the quality assurance target, so that the production efficiency of the intermediate processed product is improved. In order to avoid cutting off the intermediate product to cut off the part outside the quality assurance target, by dividing one intermediate product, the size of the intermediate product is not enough and it is not Will not come out. From the above, intermediate products,
Consequently, the production cost and price of the product can be kept very low.

Further, the quantity and total quantity in the above formula are not limited to weight, but may be calculated by volume or may be converted to price. By accumulating the result data calculated according to the present invention and constructing a database, a material supplier can efficiently take quality improvement measures.

Next, in one aspect of the method of calculating the inspection target amount for an intermediate product including a part not subject to quality assurance according to the present invention, the following expression is applied instead of the above-mentioned expression for calculating the inspection target amount. it can. R = T−Σ (X _i + L _i ) where R is the quantity of the intermediate processed product to be accepted, T is the total amount of the intermediate processed product delivered, and X _i is the quality of the intermediate processed product outside of the quality assurance target. warranty items (hereinafter, simply referred to as quality warranty items) in the periphery of the quality warranty part quantity of each, the L _i is excluded from the acceptance subject,
This is the quantity of the normal part for each item not subject to quality assurance. When there are several types of parts not covered by the quality assurance, the quantity to be accepted for each item not covered by the quality assurance is calculated and summed up to calculate a more accurate quantity to be accepted for the intermediate processed product. be able to.

Further, in another aspect of the method of calculating the inspection target amount for an intermediate product including a part not subject to quality assurance according to the present invention, a preform for an optical fiber is used as the intermediate product and an optical fiber is used as the product. can do. In other words, by creating a map or the like to inform the processor of the information on the dimensions and positions of the components outside the quality assurance target included in the optical fiber preform, the processor can draw the preform onto the optical fiber. During or after drawing, the optical fiber at a portion corresponding to the part of the preform that is not subject to quality assurance can be removed. By doing so, the processor can handle long preforms, which means that the setup of the preforms can be reduced compared to the case where the material supplier handles many preforms shortened by removing parts that are not covered by quality assurance. Time and labor such as a start-up time until the outer diameter of the optical fiber or the outer diameter of the coating is stabilized after starting the drawing or drawing can be saved. The preform can be used without waste if the optical fiber corresponding to the portion not covered by the quality assurance is effectively used for testing a coloring device, a ribbon manufacturing device, a loose tube device, and the like.

[0014] In still another aspect of the method of calculating the inspection target amount for an intermediate processed product including a part not subject to quality assurance according to the present invention, the calculation of the inspection target amount for the intermediate processed product is performed by:
The processing may be performed for each production period of the intermediate processed product, for each shipping period of the intermediate processed product, or for each product production period of the processor. Further, the shipment period may be every shipment. Further, in still another aspect of the method for calculating the inspection target amount for an intermediate processed product including a part not subject to quality assurance according to the present invention, the calculation of the inspection target amount for the intermediate processed product is performed when the production amount of the intermediate processed product is reduced. The processing may be performed every time the predetermined amount is reached, every time the shipping amount of the intermediate processed product reaches the predetermined amount, or every time the amount of the product manufactured by the processor reaches the predetermined amount. By calculating the inspection target amount for each of the above periods, the material supplier can adjust the remaining shipping amount so that the total amount of the inspection target becomes a fixed order amount from the processor. By setting such a period, the material supplier and the processor can efficiently manage the inspection target amount, which is very convenient.

[0015] In still another aspect of the method of calculating the inspection target amount for an intermediate product including a part not subject to quality assurance according to the present invention, the quality assurance excluded part includes bubbles and foreign matter in an optical fiber preform. , Surface flaws, and / or refractive index distribution profile abnormalities can be applied.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method of calculating an inspection target amount for an intermediate processed product including a part not subject to quality assurance according to an embodiment of the present invention will be described in detail with reference to the drawings.

[Outline of Calculation of Inspection Amount] As shown in FIG. 1, the total delivery amount T of the intermediate processed product (indicated by a dashed line) is
A quantity X (shown by a thick solid line) outside the quality assurance target, a quantity L of a normal part around the outside of the quality guarantee target (shown by a thin solid line), and other normal parts R (shown by a broken line). Consists of By combining these X and L, the non-acceptance target amount N is obtained, and the object to be accepted is R = T−N = T−
(X + L). FIG. 1 shows a case where there is one item not subject to quality assurance, and FIG. 2 shows a case where the inspection target amounts for each item are totaled when there are a plurality of items not subject to quality assurance. According to FIG. 2, the quantity X ₁ (indicated by a thick solid line) corresponding to a certain item and the quantity L of the normal part around the quality assurance outside component.
_The amount combined with ₁ (indicated by a thin solid line) is the untested amount for the above item. In this way, when the non-recovery yields corresponding to the other items are also calculated and totaled, the non-reception target amount N is obtained by the following equation (a). _{N = Σ (X i + L} i) ... formula (a), however, X _i is the quality quantity for each quality warranty items quality warranty of the medial workpiece, the L _i is excluded from the acceptance target guarantee This is the quantity of the normal part for each item not subject to quality assurance around the target outside component.

By subtracting the non-reception target amount N from the total delivery amount T, the inspection target amount R of the intermediate processed product can be calculated as shown in the following equation (b). R = TN = T−Σ (X _i + L _i ) Equation (b)

Next, in the case where the product is an optical fiber and the intermediate product is the optical fiber preform, the inspection target quantity of the optical fiber preform will be obtained by using the above-mentioned equations (a) and (b). . First, as defects, bubbles (4 mm in diameter) and foreign matter (5 mm in diameter)
There are two in the preform, 5mm normal parts located on both left and right sides of the bubble are excluded from the inspection, and 6mm normal parts on both right and left sides of the foreign matter are excluded from the inspection. do.

According to the above equation (a), the length N of the optical fiber preform to be excluded from the inspection is 4 + 5 + 5 =
The total length of both 14 mm (bubbles) and 5 + 6 + 6 = 17 mm (foreign matter) is 31 mm (= 14 + 17). When expressing the untested sample by volume, the cross-sectional area (for example, 3000 mm ² ) of the preform is multiplied by a length of 31 mm to obtain 93 times.
000 mm ³ is obtained, and when the amount to be inspected is indicated by weight, this volume 93,000 mm ³ may be multiplied by specific gravity. The inspection target amount R of the optical fiber preform is 969 mm obtained by subtracting N (= 31 mm) from the total amount T (for example, 1000 mm) of the preform in the case of representing the length. Similarly to the above, it can be obtained from the volume.

[Map for Quality Assurance External Parts] If an intermediate processing product is found to have a quality assurance outside part, the quality assurance outside part and the normal parts around the quality assurance outside part are not subject to inspection. Are written in a map as shown in FIG. FIG. 3 shows that, in the optical fiber preform 1 having a length of 1200 mm, there is one bubble 3 having a diameter of 3 mm at a position 520 mm from the left end (the end on the side where drawing starts when drawing an optical fiber). I have.
In this case, the reference position (origin) may be determined in advance by, for example, attaching a label to one end of a bag for packing the preform. In addition, when there are a plurality of preforms including a part not covered by the quality assurance, the preforms may be as shown in Table 1 below. As the position of the quality assurance target external part, for example, at least one of a start position, an end position, and a center position of the quality assurance target external part can be indicated.

[0022]

[Table 1]

The map can be obtained by inputting data such as the dimensions of the optical fiber preform 1 and the positions of the bubbles 3 into a computer by a material supplier. It can be sent automatically.

[Calculation Procedure of Inspection Target Amount] Next, a calculation procedure of an inspection target amount for an intermediate processed product including a part not subject to quality assurance will be described in detail by taking an optical fiber preform as an example. A material supplier manufactures a preform for an optical fiber and performs an inspection for each characteristic item. As a result of this inspection, when a processor finds a part that is not subject to quality assurance that is likely to fail to obtain the desired characteristics of the optical fiber even if the optical fiber preform is drawn, FIG. The calculation is performed according to the flowchart shown in FIG. Specifically, first, the following basic data is input to the input unit of the computer (S1).

The basic data includes, for example, the size, weight, and amount per unit weight of the optical fiber preform, the position, the size, and the weight outside the quality assurance target in the optical fiber preform, and the quality assurance target. It includes the size and weight of the normal part which is located outside the outside and is not subject to inspection. The weight of the optical fiber preform can be calculated by the following equation. W [g] = ρ [g / cm ³ ] × π × r ² [cm ² ] × L [cm] where W is the weight of the preform, ρ is the density of the preform made of glass, and π is the circumference. The ratio, r, is the radius of the preform, and L is the length of the preform. Next, these basic data are sent to and stored in the storage unit of the computer (S2). In addition, the storage unit stores in advance a program for a formula for calculating the amount to be received, and the program and the basic data are sent to the calculation unit. The amount of the optical fiber preform can be determined (S3). Regarding the calculation, the dimensions of the quality assurance external part and the dimensions of the normal part around the quality assurance external part that are not subject to inspection are
Calculate and total for each item not subject to quality assurance. Here, the items that are not subject to quality assurance are, for example, bubbles, foreign substances, surface scratches, and the like. Then, the preform amount R to be inspected can be obtained by subtracting the amount N not to be inspected from the entire optical fiber preform T.

Next, the inspection object of the preform calculated by the arithmetic processing is once sent to the storage unit and stored therein (S4), and thereafter displayed on the output unit (S4).
5). Further, the inspection target amount R of the preform is transmitted manually or automatically from the processor computer to the material supplier computer at regular intervals, for example, every shipment. Alternatively, the data may be transmitted from the processor to the material supplier by facsimile or contacted by telephone.

Hereinafter, a method for producing an optical fiber preform will be briefly described. As a method for manufacturing a preform for an optical fiber, a VAD method (Vapor phas
e Axial Deposition method), OVD method (Outside Vap
or Deposition method), MCVD method (Modified Chemi
cal Vapor Deposition method) and PCVD method (Plasma
Chemical Vapor Deposition method), but here, the VAD method will be briefly described.

First, germanium tetrachloride or the like is added as a dopant raw material for adjusting the refractive index to a glass raw material such as silicon tetrachloride. These raw materials are supplied into an oxyhydrogen flame, and are reacted with water, which is a combustion product, to synthesize fine glass particles. The glass particles are deposited on the tip of the rotating dummy glass, and the dummy glass is pulled up in accordance with the state of deposition, thereby forming a core soot, which is an aggregate of glass particles. The core soot is placed in an electric furnace, and in a halogen gas atmosphere, moisture taken in during synthesis is dehydrated, and then heated to a high temperature and sintered to produce a transparent core. Then, after stretching this core with a glass lathe, glass particles are deposited to form a clad soot, which is then dehydrated and sintered in an electric furnace in the same manner as the core, and processed to a predetermined diameter and length. An optical fiber preform can be manufactured.

The present invention is not limited to the above-described embodiment, but can be variously modified and changed. For example, in the above-described embodiment, the cycle of calculating the substitute compensation amount R is a fixed fixed period. However, the present invention is not limited to this. For each period when the quantity or shipping quantity becomes a predetermined quantity,
Alternatively, various periods can be set, such as for each period in which the amount of optical fiber produced by the processor is a predetermined amount.

[0030]

According to the method for calculating the quantity to be accepted according to the present invention, even if an intermediate product contains a part not covered by the quality assurance, it is shipped to the processor without removing the part not covered by the quality assurance. It is possible to easily and reliably calculate the quantity and price of the intermediate processed product to be accepted.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an inspection target quantity for an intermediate processed product including a part not subject to quality assurance according to the present invention, and shows a calculation method in a case where there is one item not subject to quality assurance.

FIG. 2 is a schematic diagram showing an inspection target amount for an intermediate processed product including a part not subject to quality assurance according to the present invention, and shows a calculation method when there are a plurality of items not subject to quality assurance;

FIG. 3 is a schematic diagram showing a map of a quality assurance target outside component used in the embodiment of the present invention.

FIG. 4 is a flowchart showing a procedure for calculating an inspection target amount of the optical fiber preform according to the embodiment of the present invention.

[Explanation of symbols]

 1 Preform for optical fiber 3 Bubbles

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Keitaro Fukui 2- 13-1, Isobe, Annaka-shi, Gunma Shin-Etsu Kagaku Kogyo Co., Ltd. View 1-10 Shin-Etsu Chemical Co., Ltd. Precision Functional Materials Laboratory F-term (reference) 4G021 BA04

Claims (6)

[Claims] 1. A method for calculating an inspection target amount when a material supplier delivers a processed intermediate product including a part not subject to quality assurance to a processor, the method comprising: calculating the size and weight of the intermediate processed product delivered to the processor; At least one of them, the position, size, and / or weight of the part outside the quality assurance part in the intermediate product, and the size and weight of the normal part, which is located around the outside part of the quality assurance part and is not subject to inspection. And storing basic data including at least one of the amount per unit size and the amount per unit weight of the intermediate product in a storage unit of the computer; and storing the basic data and the storage unit in advance in the storage unit. Using the following calculation formula, at least one of the inspection target amount and the inspection amount for the intermediate processed product is calculated by the computing means of the computer. Calculating the inspection data, storing the inspection data in a storage unit, and outputting the inspection data and the position data of the quality assurance target outside from an output unit of a computer. Calculation method for the quantity of inspection target for intermediate processed products including parts not covered by quality assurance. R = T-(X + L) where R is the quantity of the intermediate processed product to be accepted, T is the total amount of the intermediate processed product delivered, X is the quantity of the intermediate processed product outside the quality assurance target, and L is the intermediate processed product This is the amount of normal parts around the outside of the quality assurance target excluded from the inspection target. 2. The method according to claim 1, wherein the formula for calculating the quantity to be accepted is the following equation. R = T−Σ (X _i + L _i ) where R is the quantity of the intermediate processed product to be accepted, T is the total amount of the intermediate processed product delivered, and X _i is the quality of the intermediate processed product outside of the quality assurance target. Quantity for each non-guaranteed item, L
_i is the quantity of the normal part for each quality assurance non-target item around the quality assurance non-target part excluded from the inspection target. 3. The inspection object for an intermediate processed product including a part not subject to quality assurance according to claim 1 or 2, wherein the intermediate processed product is a preform for an optical fiber, and the product is an optical fiber. How to calculate quantity. 4. The calculation of the inspection target quantity of the intermediate processed product,
The part not subject to quality assurance according to any one of claims 1 to 3, wherein the process is performed for each production period of the intermediate processed product, for each shipping period of the intermediate processed product, or for each production period of a product in a processor. How to calculate the amount of inspection target for intermediate processed products. 5. The calculation of the inspection target quantity of the intermediate processed product,
The process is performed every time the production amount of the intermediate processed product reaches a predetermined amount, every time the shipping amount of the intermediate processed product reaches the predetermined amount, or every time the production amount of the product in the processor reaches the predetermined amount. A method for calculating an inspection target amount for an intermediate product including a part not subject to quality assurance according to any one of claims 1 to 4. 6. The optical fiber preform according to claim 1, wherein the non-guaranteed portion is at least one of a bubble, a foreign substance, a surface flaw, and an abnormal refractive index profile in the optical fiber preform. The method for calculating the inspection target amount for intermediate processed products including parts not covered by quality assurance described in Crab.