JP2000271881A - Marking method and machine part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To identify the manufacturing history of a machine part, manufactured by machining, as a mark by changing cutting speed on the surface of the part. SOLUTION: A gear 1 has a gear part 12 and a spline part 14 on the outer- periphery part of a body 10. The streak formed by delaying feed speed without changing cutting amount is formed at the outer-periphery surface B of the gear part 12, the outer side C of the spline part 14, the outer side D of the gear part 12, and an internal side E to form a mark for identifying the manufacturing history of the gear 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for marking a machine component manufactured by cutting and a machine component to which a marking is applied.

[0002]

2. Description of the Related Art Conventionally, when it is necessary to identify manufacturing history information of each processed product, the following method has been adopted. (1) Engraving (takin-type engraving, dot-type engraving, laser-type engraving, etc.) (2) Grooving (3) Attachment of labels (4) Direct entry to products (handwriting, ink jet,
etc)

For example, Japanese Patent Application Laid-Open No. 63-297790 discloses a device in which a drive gear of a blower is marked according to the tooth thickness.
The publication discloses that a notch groove is provided in a gear to be used as a sizing positioning mark.

[0004]

However, the above-mentioned prior art has the following problems. (1) In the case of embossing engraving, a portion near the embossing becomes unsuitable for use as a machining reference seat surface in a post-process due to a bulging of a peripheral portion generated by the embossing. In addition, when heat treatment is performed in a subsequent step, the amount of heat treatment deformation near the embossing becomes unstable. (2) In the case of dot-type engraving and laser-type engraving, the time during printing increases the processing time (capital investment is also large).

(3) Identification by label attachment or direct entry to a product may be reduced during use of the product or in a post-process such as heat treatment, polishing, and cleaning. (4) Discrimination by grooving cannot be performed on a part that impairs the product function, and the amount of information that can be discriminated is small. (5) Even if any of the above-described conventional product identification methods is adopted, labor costs, expenses, and fixed costs are inevitably incurred.

[0006] In addition, for processed products involving turning,
Marking as shown in FIG. 13 was also performed. That is, the outer peripheral surface of the workpiece W ₁ as a product, the tool T
In making turning by _1, and processing to be cut surface S ₁ at the pitch P ₁ fed at depth of cut F _1, it reaches the site of applying a mark in the middle, while maintaining the feed pitch P _1, cut by increasing the amount F ₂ is processed to be cutting surface S _2. When machining of the cut surface S ₂ of constant width is completed, it returns the depth of cut to F _1,
Processing remaining the cutting surface S _1. The cutting surface S ₂ created by this process exhibits the discrimination power as the mark M _1.

However, the cut surface formed by increasing the cut amount may cause a decrease in product function, durability, appearance quality, and the like, and is not always preferable as a mark. Accordingly, the present invention provides a method of marking a cut product and a product thereof that solves the above-mentioned conventional problems.

[0008]

According to the marking method of the present invention, the cutting amount of a tool is changed at a portion where the cut surface remains on the surface of the completed component in the cutting process of the surface of the component rough material. By changing the feed speed without causing the streak to be formed, a streak that can be visually recognized is formed and used as a component identification mark. Then, a plurality of the visible streaks are formed independently, and information to be identified is recorded by a combination thereof.

[0009] Further, the streaks of the mark are formed by reducing the feed speed, and it is preferable to perform the marking by cutting using an NC machine.

[0010]

FIG. 1 shows a marking method according to the present invention.
FIG. 4 is an explanatory view showing the principle of the above. Work (work) W₂Table
Surface T₁The cutting depth F₁Turning. Processing seat
Reference origin Z₀To length dimension D₁Surface S up to₁Is the feed amount P
₁Process with Coordinate position is Z₁When the point is reached, the feed
P₁To P₂To the coordinate position Z₂Length dimension up to
Law D₂To process. Feed amount P₂Is the feed amount P₁Finer
It is assumed that Due to this change in the processing conditions, the processing surface S
₃Is the feed amount P₁Machining surface S ₁Higher flatness than
Worked on the surface. Coordinate position Z₂Feed amount up to₂Processing of
Is completed, the feed amount becomes P₁To the surface S₁Processing
Execute.

[0011] work surface S _3, since the higher surface roughness than the processed surface S _1, can be the difference is visible, used as the mark M _2. Coordinate positions Z _{1 for} marking,
Setting and Z _2, control of the feed amount can be easily performed by the NC lathe.

FIG. 2 is a sectional view of a gear for a manual transmission embodying the present invention, FIG. 3 is a right side view, FIG. 4 is a left side view, and FIG.
Is a plan view of the top of the gear. A gear for a manual transmission of an automobile, generally designated by reference numeral 1, has a gear portion 12 on the outer peripheral portion of a main body 10 and meshes with other gears. A spline portion 14 is formed adjacent to the gear portion 12, and engages with the spline portion of the coupling sleeve via a synchronizer ring (not shown).

The main body 10 has a tapered surface 16 and forms a friction surface for the synchronizer ring. The inner diameter hole 18 of the main body 10 is supported by a shaft or the like of a transmission. In addition to the inner diameter hole 18 and the tapered surface 16, the outer peripheral surface B of the gear portion 12, both side surfaces D and E, the spline portion The side surface C of 14, the side surface A of the tapered portion 16, and the like are formed by turning.

Out of the turning surfaces, the outer peripheral surface B of the gear portion, both side surfaces D and E, the outer surface C of the spline portion 14, and the like,
These parts do not come into contact with other parts and do not require finishing work such as grinding in the subsequent process, and the surface of the finished product has streaks when cutting as it is. Can be used to identify the processing and manufacturing history of a product.

[0015] In the illustrated embodiment, the gear portion 12 marks the one presence or absence of marks L ₁ of the outer peripheral surface B, the spline portion 14 of the two outside surfaces C mark L of _2, L ₃ An example of marking the presence or absence is shown. Similarly, four marks L ₄ , L ₅ , L ₆ , L ₇ are provided on the outer surface D of the gear portion 12.
Is marked, and the spline portion 1 of the gear portion 12 is marked.
The five marks L ₈ , L ₉ , L on the inner surface E facing the four sides
_10, an example of marking the presence of _{L 11, L 12} are shown.

[0016] FIG. 6 is an explanatory diagram showing an example of the first use of the mark L _1. In the figure, a circle indicates that there is a mark, and a blank indicates that there is no mark. Gear 1 first mark L ₁ is attached is formed on the outer peripheral portion of the gear portion 12,
The mark L ₁ indicates processing by a night shift worker, and the internal gear 1
Indicates processing by daytime workers.

[0017] Figure 7 illustrates a provided on the outer surface of the spline portion 2 of the mark L ₂ and the third combination of mark L _3, an example identifies the four processing machines. The gear 1 without the _two marks L ₂ and L ₃ indicates that the gear 1 was machined by the machining machine A, and the gear 1 with only the second mark L ₂ was
Indicates that it was processed by the processing machine B. Similarly, the third gear 1 only mark L ₃ is attached to indicate that it is processed by the processing machine Ha, second, gear 1 both are attached to the third mark L _2, L ₃ is , Indicating that it was processed by the processing machine d.

FIG. 8 shows a method of identifying the manufacturing month of the gear 1 by _four marks L ₄ , L ₅ , L ₆ , L ₇ provided on the outer surface D of the gear portion 12. Since four marks are combined, a function for identifying 16 data equivalent to 2 to the fourth power is provided. In the illustrated embodiment, one mark, two marks,
Depending on the position of the three marks and their combination, from January to 12
The example which identifies the manufacturing month until the month is shown.

FIG. 9 is a sectional view of a gear 5 provided on the inner surface E of the gear portion 12.
Book mark L₈, L₉, L₁₀, L ₁₁, L₁₂By
Shows how to identify the date of manufacture. Combine 5 marks
So it is possible to identify 32 data equivalent to 2 to the 5th power
it can. In the embodiment shown, all marks are missing
Except for cases where dates between 1 and 31 are identified
It is shown. These identification methods depend on the position of the mark and the book.
It is necessary to prepare an identification table corresponding to the numbers.

FIG. 10 shows four marks L ₄ , L ₅ ,
Another example of identifying the production month using L ₆ and L ₇ will be described. In this method, a binary identification method is adopted.
For this reason, by reading the position and the number of marks, it is possible to refer to the production month without referring to the identification table.

FIG. 11 similarly shows five marks L ₈ ,
An example in which the production date is identified in a binary system using L ₉ , L ₁₀ , L ₁₁ , and L ₁₂ will be described. In the example described above, an example was given in which marks are attached according to orderly rules and read to identify manufacturing history, but in order to avoid data leakage, it is naturally possible to use a unique pattern. is there. The above is an explanation of an example in which the marking of the present invention is applied to a gear, but the present invention can naturally be applied to a gear other than a gear.

FIG. 12 shows an embodiment in which the small diameter portion of the main shaft of the manual transmission is marked according to the present invention.
That is, the main shaft 20 of the manual transmission does not come into contact with other members on the shaft main body 21, and does not require finishing such as grinding in a later step. Shaft 2 with a surface where the streak of the edge remains as it is
2,23. Therefore, four marks L ₂₁ , L ₂₂ , L ₂₃ , and L ₂₄ are provided on the shaft portion 22 so that the month of manufacture can be identified. Since the shaft portion 23 has a larger axial dimension than the shaft portion 22, the five marks L ₂₅ , L ₂₆ , L
_27, the provided _{L 28, L 29,} performs identification of the production date.

[0023]

The present invention can be applied to all products which are subjected to feed processing (turning, milling, drilling, etc.) by an NC-processing machine, and can be applied to products in various fields. It is possible. There are the following effects and merits as compared with the conventional method. (1) Since there is no effect on dimensions and surface roughness, the product function is not impaired, and the identification line part can be used as a reference plane for machining in the subsequent process. There is no effect on the heat treatment deformation amount in the heat treatment step. (2) The identification line does not change over time due to heat, oil, or the like during use of the product, and does not disappear in a post-process such as heat treatment, polishing, and cleaning. Therefore, it is easy to reliably obtain the product history information, which is indispensable for specifying the scope of the complaint and investigating the cause of the occurrence of the trouble phenomenon.

(3) No new or additional capital investment is required, and labels and ink costs are also unnecessary. That is,
Extension of machining time and deterioration of tool life due to the addition of NC-program are usually at a level that can be completely ignored. (4) If the identification line generation site is selected in consideration of the product function and the processing step, it is possible to incorporate a remarkable amount of information as compared with the existing identification by grooving processing.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing the principle of the marking method of the present invention.

FIG. 2 is a cross-sectional view of a gear for performing the marking of the present invention.

FIG. 3 is a right side view of FIG. 2;

FIG. 4 is a left side view of FIG. 2;

FIG. 5 is a plan view of a part of a gear.

FIG. 6 is an explanatory diagram showing identification of a first mark and a processing shift.

FIG. 7 is an explanatory diagram showing identification of second and third marks and a processing machine.

FIG. 8 is an explanatory diagram showing fourth to seventh marks and identification of a manufacturing month.

FIG. 9 is an explanatory diagram showing eighth to twelfth marks and identification of a manufacturing date.

FIG. 10 is an explanatory diagram showing another example of identification of the fourth to seventh marks and the month of manufacture.

FIG. 11 is an explanatory view showing another example of identification of the eighth to twelfth marks and the date of manufacture.

FIG. 12 is an explanatory view showing another embodiment of the present invention.

FIG. 13 is an explanatory view showing a conventional marking method.

[Explanation of symbols]

First gear 10 gear body 12 gear portion 14 splined portion 16 tapered portion 18 inner diameter L ₁ ~L ₁₂ marks

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuki Suzuki 8 Dosanabe, Fujisawa-shi, Kanagawa Prefecture Isuzu Motors Fujisawa Plant Co., Ltd. (72) Inventor Shinobu Miura 8 Dosanabes, Fujisawa-shi, Kanagawa Isuzu Motors Fujisawa Plant, Inc. (72) Inventor Shunji Shima 8 Tsurana, Fujisawa, Kanagawa Prefecture Isuzu Motors Fujisawa Plant F-term (reference) 3J030 AC10 BC02

Claims (7)

[Claims] 1. In cutting a surface of a component rough material, by changing a feed speed without changing a cutting amount of a tool in a portion where a cut surface remains on a surface of a completed component. A marking method in which visible streaks are formed and used as component identification marks. 2. The marking method according to claim 1, wherein a plurality of said visible streaks are independently formed, and information to be identified is recorded by a combination thereof. 3. The marking method according to claim 1, wherein the streaks of the mark are formed by reducing a feeding speed. 4. The marking method according to claim 1, wherein the cutting is turning. 5. The marking method according to claim 1, wherein the cutting is performed by an NC machine. 6. The marking method according to claim 1, wherein the component is a gear. 7. In the cutting of the surface of a part coarse material, a feed speed is visually changed by changing a feed rate without changing a cutting amount of a tool with respect to a part where a cut surface remains on a surface of a completed part. A mechanical part that forms a possible streak and serves as an identification mark for the part.