JP2009167441A - Molding die, method for imparting indication mark of manufacture month by using the same, and sintered component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding die which has a function of engraving a manufacture month on a molded product with an integrated engraving mark simultaneously during molding, and can easily correspond to the change of the manufacture month. <P>SOLUTION: The die has at least 11 pieces of projections 5 for engraving the manufacture month provided on its end face 2, and besides the projections 5 can be pared away. When the total number of the provided engraving projections 5 is represented by N, and the number which indicates the manufacture month of the molded product is represented by X, the engraving projections having the number obtained by an expression of (N-X+1) is left, and the recess part having the number obtained by the above expression is engraved on the end face of the molded product with the use of the left projections. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides a molding die having a function of marking a manufacturing month on a molded product at the same time as molding, and a manufacturing month indication mark that is given by marking the manufacturing month on a molded product manufactured by the mold. The present invention relates to a method and a sintered part in which a manufacturing month is stamped on an end surface manufactured by the method of the present invention using the molding die of the present invention.

  It has been conventionally performed to display a manufacturing date, a manufacturing date, and the like for managing quality and a manufacturing lot on a molded product manufactured by die molding.

When it is required to display the date of manufacture, etc., a method is adopted in which a display mark (generally a number) is stamped on the surface of the molded product. The marking of the display mark may be performed by using a dedicated marking device as disclosed in Patent Document 1 below, but if a dedicated marking device is provided, the molding equipment becomes complicated and the cost of the molded product increases. . Therefore, it is not necessary to display the date of manufacture, and only the date of manufacture and month of manufacture need to be displayed. In the manufacture of molded products, an integral marking mark is formed on the mold and the mold is molded. A method of transferring the marking mark to the end face of the molded product may be employed.
JP 2000-280259 A

  The method of transferring the marking mark formed integrally with the mold to the end face of the molded product at the time of molding with the mold has an advantage that the manufacturing date can be stamped without using a dedicated marking device. However, in this method, numbers are used for both the year of manufacture and the month of manufacture, so the stamp mark should be rewritten to indicate the new date of manufacture when the date of manufacture changes. Is required.

  The remodeling is performed by scraping off the old marking mark and providing a new marking mark on the end face of the mold by electric discharge machining. Even if the life of the mold exceeds 1 year, the marking for the year of manufacture should not be a problem because it only needs to be remade once a year, but the mark for the month of manufacture can be recreated every month. It was necessary and the effort and cost were not negligible.

  This invention makes it possible to easily cope with the change of the manufacturing month, and makes the manufacturing month stamp mark which has been a problem with the mold while taking advantage of the mold having the manufacturing date stamp mark integrally formed. The challenge is to reduce the labor and cost for remodeling.

  In order to solve the above problem, in the present invention, a molding die is configured as follows. Specifically, the mold has a stamping projection for the month of manufacture on the end surface which is the molding surface, and at least 11 of the stamping projections are provided, and the stamping projections can be scraped off. Assuming that the total number of protrusions is N and the number indicating the month of manufacture of the molded product is X, the number of stamping protrusions determined by the formula (N−X + 1) is left and the number of stamping protrusions is determined by the above formula. The concave portion was engraved on the end face of the molded product. The total number N of the marking protrusions is preferably 11 or 12 because there is no waste. For example, a mold having a total installation number N of 11 has a number of stamping protrusions of 0 when used in December, and a mold having a total installation number N of 12 has the number of stamping protrusions when used in December. Becomes 1.

  In this molding die, it is preferable that a convex portion is formed on a part of the end surface, and the marking protrusion is provided on the tip (front surface) of the convex portion.

  It is also preferable that a plurality of the protrusions are formed in a scattered manner, and that a plurality of the marking protrusions are provided at the tip of each protrusion.

  In the present invention, a method for providing a manufacturing month indication mark for marking the manufacturing month on the end face of a molded product simultaneously with molding using the molding die described above, and a green compact using the molding die of the present invention Sintered parts manufactured by molding the green compact and sintering the green compact are also provided.

  In the manufacturing month marking method, at least 11 recesses are imprinted on the molded product manufactured in January with the stamping protrusion provided on the end face of the mold, and the stamping protrusion is added every month after that. Each of the marking protrusions is scraped one by one, where N is the total number of the marking protrusions and X is the number indicating the month of manufacture of the molded product, and X is the number of the recessed protrusions determined by the formula (N−X + 1). Stamp the molded parts manufactured on the moon.

  In the latter sintered part, a concave portion for displaying the manufacturing month is stamped on the end face, and N to 0 concave portions for displaying the manufacturing month are provided, and the number of the concave portions represents the manufacturing month. The number of recesses representing the month of manufacture here decreases as the number of the month of manufacture increases.

  Note that the year of manufacture can also be marked at the same time as the month of manufacture by providing a mark for marking, and the mark can be any number or symbol.

  In the molding die and the manufacturing month indication mark applying method according to the present invention, the marking mark of the manufacturing month is constituted by the marking protrusions and at least 11 marking protrusions are provided. In the case of a molded product manufactured in January, 11 recesses are stamped on the end face of the molded product with 11 stamping projections, and thereafter the stamping projection is reduced by one each time one month elapses. The number of recesses determined by the formula (N−X + 1) can be imprinted on the molded product manufactured in the month X by the protrusion. Corresponding to the change of the manufacturing month from January to December can be done by scraping one marking protrusion every month, and the labor and cost of changing the manufacturing month marking mark can be saved.

  In addition, when the mold of the present invention is used until December, the mold for the year of manufacture is changed to a mark for marking a new year of manufacture. Protrusions for marking the moon are again formed on the end faces. This work only needs to be done once a year, and the work itself is not necessary for a mass-production mold that can be used for less than one year, resulting in a significant reduction in labor and cost savings. There is no.

  The mold according to the present invention, when a molded product manufactured using the mold is used by sliding the end surface onto another part, etc., the date of manufacture is displayed at a position off the end surface of the molded product. What was provided is preferable. A mold that has a convex part formed on a part of the end surface that is the molding surface and has a marking projection at the tip of the convex part, displays the month of manufacture given to the molded product in response to the request. It can form in the part which fell from the end surface.

  In addition, when a mold is provided with several stamping projections distributed on each of the convex portions formed on the end face, the installation restrictions on the stamping projections are relaxed, and a large installation space cannot be secured in one place. To be advantageous.

  In addition, the sintered part of the present invention can be manufactured by the method of the present invention using the mold of the present invention, which can easily switch the manufacturing month, and the cost is reduced.

  Hereinafter, an embodiment of a molding die according to the present invention will be described with reference to FIGS. The illustrated mold 1 is used in a powder molding apparatus for producing a green compact for a sintered part. Although not shown in the figure, the mold set of the powder molding apparatus includes a die, a lower punch, and an upper punch as minimum elements, and a core or the like is also adopted as necessary. The illustrated mold 1 is an upper punch of the mold set.

  The mold 1 is provided with a plurality (four in the figure) of convex portions 3 on the outer peripheral portion of the tip side end surface 2 serving as a molding surface, and a molded product is formed at the tip of one of the convex portions 3 therein. A marking mark 4 for marking the year of manufacture is provided. The marking mark 4 shown in the figure is the number “7” representing the year 2007, but it is sufficient to know the year of manufacture, and a symbol may be adopted instead of the number. The marking mark 4 may be either a relief mark or a dug mark.

  A marking protrusion 5 for marking the manufacturing month is provided at the tip of the remaining convex portion 3. The marking protrusions 5 are distributed at the tips of the remaining three protrusions 3. Here, the total number N of the protrusions 5 is set to 11, and 11 for the green compact manufactured in January. Eleven recesses are formed on the end face of the green compact by the projection 5. In this mold 1, the stamping protrusions 5 are scraped one by one each time the month of manufacture progresses, and the remaining protrusions form recesses on the end face of the green compact.

  FIG. 5 shows the end face shape of the green compact molded by this mold 1. The green compact (molded product) 6 has four concave portions 8 formed by the convex portions 3 of the mold 1 on the outer peripheral portion of the end surface 7 formed by the mold 1, and one concave portion therein. A display mark 9 indicating the year of manufacture is provided at the bottom of 8, and a recess 10 indicating the month of manufacture is provided at the bottom of the other three recesses. The sintered part of the present invention is manufactured by sintering the green compact 6.

  The total number N of the marking protrusions 5 provided on the mold 1 may be set to 12, and the green compact formed by the mold having the total number N of 11 is Y (12-Y). The number obtained by the formula (1) represents the month of manufacture, and the green compact molded by the mold having the total number of installation N of 12 represents the month of production.

  Note that the marking protrusions 5 may be provided in one place if there is no space limitation. Moreover, it is preferable that the initial height H of the convex portion 3 shown in FIG. 4 is larger than the protruding amount h of the marking protrusion 5, and those satisfying the requirement are obtained by processing the convex portion 3 when the manufacturing year changes. A protrusion 5 for marking the manufacturing month can be newly made at the tip of the protrusion 3.

Sectional drawing which shows embodiment of the metal mold | die of this invention End view of the mold in FIG. Enlarged view of the end face of the mold in FIG. The expanded sectional view of the part along the XX line of FIG. End view of the green compact molded with the mold of Fig. 1

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal mold | die 2 End surface 3 Convex part 4 Marking mark 5 Marking protrusion 6 Green compact 7 End surface 8 Recess 9 Production year indication mark 10 Concave part which displays a manufacture month

Claims (6)

  On the end surface (2) to be a molding surface, there is a manufacturing month marking projection (5), and at least 11 marking projections (5) are provided, and the marking projection (5) can be scraped off, When the total number of the marking protrusions (5) is N and the number indicating the month of manufacture of the molded product is X, the number of the marking protrusions (5) determined by the formula (N−X + 1) is left to be stamped. A molding die configured to imprint the number of recesses obtained by the above formula on the end face of the molded product by the projection (5).   The molding die according to claim 1, wherein the N is set to 11.   The molding die according to claim 1 or 2, wherein a convex portion (3) is formed on a part of the end face (2), and the marking protrusion (5) is provided at a tip of the convex portion (3).   The said convex part (3) is scattered and formed in multiple numbers, The said processus | protrusion (5) for marking is provided in the front-end | tip of each convex part (3) several each in a distributed manner. Mold for molding. A method for providing a manufacturing month indication mark, wherein a molded product is molded using the molding die according to any one of claims 1 to 4, and a manufacturing month is engraved on an end surface of the molded product simultaneously with the molding. Because
At least 11 recesses are imprinted on the molded product manufactured in January by the marking projection (5) provided on the end surface (2) of the mold (1), and the marking projection ( 5) are removed one by one, where the number of installation of the marking protrusions (5) is N, and the number indicating the month of manufacture of the molded product is X, the number of recesses (10) determined by the formula (N−X + 1) A method of providing a month indication mark for a molded product, wherein the marking projection (5) is used to mark a molded product manufactured in month X. A sintered part produced by sintering a green compact obtained by molding with the molding die according to any one of claims 1 to 4, wherein the concave part (10) displays a production month on an end face. ), N to 0 recesses (10) for displaying the month of manufacture are provided, and the number of recesses represents the month of manufacture.

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