JP2009000730A - Press apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press apparatus with which the supply frequency of working oil is reduced and further scattering of the working oil in a job site is reduced. <P>SOLUTION: This press apparatus is provided with a die 11 and a punch 13, and a plurality of first recessed parts 11b as oil reservoirs are formed in a first region 11a which is a prescribed region on the pressing surface of the die 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a press apparatus provided with a die and a punch.

  Conventionally, when performing plastic working such as deep drawing and ironing using a press device, in order to prevent processing defects such as cracking and seizure due to friction between the metal material for pressing and the mold, A method of supplying processing oil as a lubricant to the press surface is employed.

  However, in the above method, in general, it is necessary to supply the processing oil every time the press is performed several times, which is troublesome, and a large amount of expensive processing oil is consumed. Furthermore, since the processing oil is scattered around due to impact during pressing or the like, the work site becomes dirty, and so-called 5S activity cannot be thoroughly performed.

  In relation to this, the following Patent Document 1 proposes a method of selectively supplying the working oil only to a portion where molding defects are likely to occur, that is, a portion where a load is concentrated during pressing. By using this method, it is possible to reduce the amount of supply at one time when the processing oil is supplied, thereby reducing the influence of the processing oil on the subsequent process.

  However, even if the above method is used, the processing oil on the mold surface is likely to be damaged due to large deformation and movement of the metal material in a portion where the load is concentrated during pressing, and the supply of the processing oil must be repeated frequently. The point is still not resolved. Further, the problem that the work site becomes dirty due to scattering of the processing oil is still not solved.

As another related technique, the following Patent Document 2 proposes a method of supplying processing oil to the surface of a press die instead of a metal material to be processed.
JP 2002-346645 A JP 2002-327190 A

  The present invention has been made to solve the above-described problems, and an object of the present invention is to reduce the frequency of processing oil supply and to further reduce scattering of the processing oil at the work site. An object of the present invention is to provide a press device that can perform the above.

  The press device according to the present invention for achieving the above object includes a die and a punch, and a plurality of first recesses as oil reservoirs are formed in a first region which is a predetermined region on the press surface of the die. It is characterized by being.

  According to the present invention, it is possible to reduce the supply frequency of the processing oil during press molding, and thus it is possible to simultaneously achieve cost reduction and efficiency of the pressing process.

  In addition, according to the present invention, it is difficult to cause processing defects such as seizure to the mold even under severe processing conditions, so that the life of the mold can be improved.

  Furthermore, according to the present invention, since the processing oil supplied to the mold is held in the oil reservoir, it is possible to reduce scattering of the processing oil to the surroundings, thereby thoroughly implementing 5S activities at the work site. become able to.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 and 2 are cross-sectional views showing the main part of the press device 1 of the present embodiment. These show a state before pressing and a state in the middle of pressing.

  As shown in FIG. 1, a pressing device 1 is disposed above a molding panel 2 to be processed, and a die 11 provided so as to be capable of reciprocating in a direction perpendicular to the surface of the molding panel 2. A wrinkle restraining portion 12 that is disposed below the metal panel 2 and reciprocates while sandwiching the forming panel 2 together with the die 11, and a fixed punch that is disposed below the metal material 2 and surrounded by the wrinkle restraining portion 12. 13.

  In the present embodiment, a plurality of oil reservoir recesses 11 b are formed on the inner peripheral surface of the die 11 to hold the processing oil supplied via the molding panel 2 during pressing. Such a plurality of recesses 11b are formed in a uniform arrangement in a predetermined region 11a on the inner peripheral surface of the die 11, as schematically shown by dotted lines in FIGS. The predetermined area 11a will be described later with reference to FIG. The concave portion 11b can be formed by an arbitrary method, but in order to obtain the concave portion 11b having a uniform shape, it is preferably formed continuously by laser pulse irradiation. As an example, the laser irradiation part inserted into the die hole and directed toward the predetermined region 11a of the die 11 is irradiated with pulse while rotating around the central axis of the die hole, thereby uniformly recessing in the predetermined region 11a. 11b can be formed. In addition, although the arrangement | sequence of the some recessed part 11b is not specifically limited, In order to increase the number of the recessed parts 11b per unit area as an example, it is preferable to set it as a staggered arrangement | sequence. Details of the shape and size of each recess 11b will be described later.

  In FIG. 1, when the die 11 and the wrinkle restraining portion 12 are driven in the direction of the arrow by a driving means (not shown), the forming panel 2 is held between the die 11 and the wrinkle restraining portion 12 and the tip portion of the punch 13. Pressed against. Then, as shown in FIG. 2, the forming panel 2 is plastically deformed according to the shapes of the die 11 and the punch 13.

  It should be noted that processing oil as a lubricant needs to be supplied in advance to the surface of the molding panel 2 that is sequentially press-molded at a predetermined ratio (for example, one per several sheets). FIG. 3 is a diagram illustrating a method of supplying the processing oil to the forming panel 2. As shown in FIG. 3, the processing oil is applied to the surface of the molding panel 2 using a mist spray sprayer or a coating roller. At this time, the processing oil may be applied to the entire surface of the metal material 2 in order to simplify the application work, or a specific part (for example, a predetermined region 11a of the die 11) to reduce the application amount. It may be applied only to the corresponding part).

  Thus, the reason why the processing oil is applied to the molding panel 2 is that the lubricity between the molding panel and the mold (particularly the shoulder portion of the die) is generally insufficient and the friction between the two becomes excessive. This is because processing defects such as cracking and seizure of the molding panel may occur. Here, seizure means that a part of the molding panel is melted by frictional heat during pressing and adheres to the mold surface. If you continue to use a mold with seizure, the panel surface after press molding will be scratched, and the product value will be lost.

  Therefore, in the present embodiment, a plurality of recesses 11b are provided as oil reservoirs in a predetermined region 11a on the inner surface of the die 11. The processing oil supplied to the die 11 through the molding panel 2 during pressing enters the recess 11b and is held there. As a result, even if the press is repeated, the lubricity of the inner surface of the die is not easily impaired, and the frequency of supplying the processing oil can be reduced. At the same time, it is possible to reduce contamination at the work site due to scattering of excess processing oil.

  Then, the shape and shape of the recessed part 11b are demonstrated using FIG. The shape of the recess 11b is not particularly limited, but is preferably an ellipse as shown in FIG. This is because the inner surface per piece can be enlarged by making it oval, and a relatively large amount of processing oil can be held even with a small number.

  Further, the size of the recess 11b is not particularly limited, but considering the processing accuracy by laser pulse irradiation, the width is preferably about 100 μm and the length is about 200 μm. Next, the depth of the recess 11b will be described with reference to FIG.

  FIG. 5 is a graph showing the relationship between the ironing rate by the press device 1 according to the present embodiment and the optimum depth of the recess 11b. The horizontal axis of FIG. 6 represents the ironing rate (%) by press molding, and the vertical axis shows the result of measuring the number of presses until the occurrence of seizure while changing the depth of the recess 11b. Depth (μm) that can be achieved.

  Here, the ironing rate is the ratio of the thickness of the base material before ironing to the amount of reduction in the thickness of the base material due to ironing, and is expressed by Equation 1 below.

  From Equation 1, the larger the ironing rate, the more plastic deformation is applied to the material. In general, in severe press molding in which the ironing rate exceeds 25%, molding defects such as cracking and seizure are likely to occur, and it is necessary to supply an appropriate processing oil.

  As shown in FIG. 6, the formation of the recess 11b for oil sump is effective in performing press molding with an ironing rate of 10% or more, and in order to perform press molding with a larger ironing rate, the depth of the recess 11b. It is understood that it is preferable to increase.

  In the present embodiment, the depth of the recess 11b is not particularly limited. However, considering the processing accuracy by the laser, the depth of the recess 11b is preferably 5 to 50 μm. This is because the recess 11b is uniformly formed on the inner surface of the die 11. Further, in order to reduce the error in the shape of the recesses 11b, it is preferable that the depth of the recesses 11b is further set to 20 to 40 μm.

  Next, the predetermined region 11a for forming the oil reservoir recess 11b in the press device 1 of the present embodiment will be described with reference to FIG.

  As described above, the recess 11b is preferably formed by laser pulse irradiation, but the present invention is not necessarily limited to this, and a method capable of uniformly forming a plurality of recesses acting as an oil reservoir. Any method may be adopted as long as it is. As an example, a method using shot peeling can be considered.

In the present embodiment, it is obvious that the oil reservoir recess 11b is preferably formed in a portion where the load concentrates during pressing. Therefore, in the present embodiment, the predetermined region 11a for forming the concave portion 11b is a die shoulder portion 11c where the load is concentrated during pressing and the vicinity thereof as shown in FIG. As an example, the predetermined region 11a is a region extended by about 5 mm from the die shoulder 11c and the R stop 11d on both sides of the die shoulder 11c.
<Experimental example>
Next, the processing oil reduction effect by providing the oil reservoir according to the present embodiment will be described with reference to FIG. The horizontal axis in FIG. 7 represents the number of presses after an appropriate amount of processing oil is supplied to the metal material, and the vertical axis represents the amount of processing oil remaining on the inner surface of the die after the press working. Yes. In this experiment, for the sake of convenience, the time when the seizure of the metal material 2 occurred was regarded as the time when the remaining amount of processing oil became zero.

  A curve A indicated by a dotted line is an approximate curve based on a measurement result when a conventional die without an oil reservoir is used, and a curve B indicated by a solid line is the curve of the present embodiment in which an oil reservoir is provided. It is an approximate curve based on the measurement result at the time of using the die | dye 11. FIG.

  Referring to FIG. 7, when the conventional press working apparatus is used (curve A), seizure occurs when the press is performed 3 to 4 times after supplying the working oil, and the press working apparatus of the present embodiment is When used (curve B), seizure occurred when the press was performed 14 times after supplying the processing oil. That is, according to the conventional press device, the press could be performed only 3 to 4 times after supplying the processing oil. However, according to the press processing device of this embodiment, the press was performed 14 times after supplying the processing oil. It became possible to do. That is, by forming a recess as an oil reservoir on the inner surface of the die, the supply frequency of the processing oil can be actually reduced to 1/3 or less.

  As described above, according to the press device 1 of the present embodiment, the supply frequency of the processing oil at the time of pressing can be reduced, so that cost reduction and efficiency of the pressing process can be achieved at the same time.

  Moreover, according to the press apparatus 1 of this embodiment, since it becomes difficult to generate | occur | produce process defects, such as seizing on the die | dye 11, even in severe processing conditions, the lifetime of the die | dye 11 can be improved.

  Furthermore, according to the present invention, since the processing oil supplied to the die 11 is held in the oil reservoir recess 11b, scattering of the processing oil to the surroundings can be reduced, and thereby, 5S activities can be thoroughly implemented.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims.

  For example, in the above embodiment, the oil reservoir recess 11b is formed only on the die 11 side, but similarly, the oil reservoir recess 13b is also formed on the punch 13 side (particularly the punch shoulder and the vicinity thereof). Can do. At this time, the shape, dimensions, arrangement, and the like of the recesses 13b are the same as those in the above embodiment. Moreover, the area | region for forming the recessed part 13b is taken as the area | region extended about 5 mm from the punch shoulder of the punch 13, and the R stop of the both sides as an example. Thus, by forming a recess for oil sump on the punch 13 side as well, the supply frequency of the processing oil can be further reduced.

  Moreover, in the said embodiment, although processing oil is supplied to the panel 2 for shaping | molding, it is also possible to supply processing oil directly to the die | dye 11 side. In this case, the processing oil is preferably supplied to the predetermined region 11 a of the die 11.

It is sectional drawing of the press apparatus concerning this embodiment. It is sectional drawing of the press apparatus concerning this embodiment. It is a figure for demonstrating the application method of the process oil to the panel for shaping | molding. It is an enlarged view of the recessed part for oil sump provided in the press apparatus concerning this embodiment. It is a graph which shows the relationship between the squeezing rate by the press apparatus concerning this embodiment, and the optimal depth of the recessed part for oil reservoirs. It is a figure for demonstrating the predetermined area | region which forms the recessed part for oil sumps in the press apparatus concerning this embodiment. It is a figure which shows the reduction effect of the processing oil supply frequency by the press apparatus concerning this embodiment.

Explanation of symbols

1 Press device,
11 Dice,
11a predetermined area,
11b recess,
11c Dice shoulder,
12 Wrinkle holding part,
13 punches,
2 Panel for molding.

Claims (15)

A pressing device comprising a die and a punch,
A press apparatus, wherein a plurality of first recesses as oil reservoirs are formed in a first area which is a predetermined area on the press surface of the die.   The press apparatus according to claim 1, wherein an outer periphery of the first concave portion has an elliptical shape.   3. The press device according to claim 1, wherein the depth of the first recess is in a range of 5 μm to 50 μm.   The depth of the said recessed part is further in the range of 20 micrometers-40 micrometers, The press apparatus of Claim 3 characterized by the above-mentioned.   The press apparatus according to claim 1, wherein the first region is a region including a die shoulder of the die.   The press apparatus according to claim 1, wherein the plurality of first recesses are arranged in a zigzag pattern.   The press apparatus according to claim 1, wherein the first recess is formed by laser pulse irradiation.   The press according to any one of claims 1 to 7, wherein a plurality of second recesses as oil reservoirs are further formed in a second region which is a predetermined region on the press surface of the punch. apparatus.   The press device according to any one of claims 1 to 8, wherein a plurality of second recesses as oil reservoirs are formed in a second region which is a predetermined region on the press surface of the punch. .   The press apparatus according to any one of claims 1 to 9, wherein an outer periphery of the second concave portion has an elliptical shape.   The depth of the said 2nd recessed part exists in the range of 5 micrometers-50 micrometers, The press apparatus as described in any one of Claims 1-10 characterized by the above-mentioned.   The depth of the said 2nd recessed part is further in the range of 20 micrometers-40 micrometers, The press apparatus of Claim 11 characterized by the above-mentioned.   The press apparatus according to any one of claims 1 to 12, wherein the second region is a region including a punch shoulder of the punch.   The press device according to claim 1, wherein the plurality of second recesses are arranged in a zigzag pattern.   The press device according to claim 1, wherein the second recess is formed by laser pulse irradiation.

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