JP4812307B2 - Burring mold and burring method - Google Patents

Description

  The present invention relates to a burring die that forms a new burring portion with a punch and a die while avoiding interference with a burring portion that has already been formed on a workpiece, and a burring processing method that uses the burring die.

  A conventional burring mold is disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-51967.

  In this burring mold, the punch side has a punch chip and a urethane rubber work plate presser provided on the punch chip, and the die side has a die chip and an ejector plate provided around the die chip. (For example, FIG. 1 of the publication).

With this configuration, when the punch is lowered, the workpiece placed on the die-side ejector plate is lowered while being pressed by the punch-side workpiece plate presser and the die-side ejector plate. As a result of this cooperation, the prepared work hole is protruded upward to form an upward burring portion.
JP 2000-51967 A

  However, in the prior art, at the time of processing, the upper surface of the work placed on the ejector plate and the periphery of the pilot hole is pressed by the lower end of the hard metal punch tip.

  Therefore, when a burring portion is already formed on the workpiece, if the punch tip is lowered to form a new burring portion in the vicinity of the burring portion, the lower end of the punch tip is the burring where the punch tip is already formed. There is a risk that it may interfere with the portion and be crushed. For this reason, it is difficult to reduce the interval between the burring portion already formed and the burring portion to be formed next.

  That is, as shown in FIG. 7 of the present application, the workpiece W is placed on the ejector plate 71 on the die mold D side, the punch chip 70 on the punch mold P side is lowered, and the lower end of the punch chip 70 is placed on the pilot hole A. ′ Is brought into contact with the outside of the upper peripheral edge, and then the entire work W is lowered, the fixed die chip 72 projects the lower peripheral edge of the descending lower hole A ′ upward, A new upward burring portion is formed on the outer periphery of the pilot hole ′.

  However, as shown in the figure, when the upward burring portion B is already formed in the vicinity of the pilot hole A ′, as described above, when the punch tip 70 is lowered, the lower end of the punch tip 70 is Interfering with the burring portion B, the burring portion B is crushed.

  As a result, as described above, it is difficult to reduce the interval between the burring portions formed on the workpiece. Therefore, conventionally, the interval between the burring portions has to be increased to some extent, and the interval is arbitrarily set. There are various adverse effects such as being unable to do so and limiting the products to be processed.

  For example, since the interval between the burring portions cannot be set arbitrarily, the number of burring portions formed on the workpiece is limited, and the arrangement of the burring portions is also limited. Therefore, the desired number and arrangement of burring portions Therefore, it is impossible to manufacture a product provided with the manufacturing efficiency.

  The purpose of the present invention is to allow the interval between the burring portions to be arbitrarily set by making it possible to avoid interference with the burring portions that are already formed when forming a new burring portion on the workpiece, Provided are a burring mold and a burring processing method for manufacturing a product having a desired burring portion and improving manufacturing efficiency.

In order to solve the above-mentioned problems, the present invention provides, as described in claim 1,
The punch mold P or the die mold D is formed of the punch mold P and the die mold D, and the escape sections 1 and 3 for escaping the upward burring portion B or the downward burring portion G already formed on the workpiece W. The escape portions 1 and 3 have inclined portions 1a and 3a, and the inclined portions 1a and 3a have a lower end or upper end rising from a new upward burring portion B ′ or downward burring portion G ′ of the workpiece W. a burring die, characterized in that the annular dent stick I contactable der only near a partial radical a to該根present a is an annular groove forming portion for forming a groove,
A burring method using the burring mold according to claim 1 as described in claim 2 ,
(1) While positioning the upward burring part B or the downward burring part G already formed on the workpiece W below or above the relief parts 1 and 3 provided in the punch mold P or the die mold D, After the processing area on the workpiece W for forming a new upward burring portion B ′ or downward burring portion G ′ is positioned at the punch center C,
(2) Hold the workpiece W with a punch die P and a die die D;
(3) Thereafter, the punch tips 38 and 42 on the punch die P side are lowered, and the punch chips 38 and 42 that are lowered and a predetermined member on the die die D side are formed on the pressed workpiece W. The upward burring portion B or the downward burring portion G that has escaped to the escape portions 1 and 3 and an annular groove forming portion that is the lower end or the upper end of the inclined portions 1a and 3a constituting the escape portions 1 and 3 are newly provided. A new upward burring portion B ′ is formed by projecting the processing region on the workpiece W upward or downward while contacting only the vicinity of the root A portion of the upward burring portion B ′ or the downward burring portion G ′. Alternatively, technical means called a burring method characterized by forming a downward burring portion G ′ is provided.

  According to the above configuration of the present invention, for example, at the lower end of the punch tip 38 on the punch die P side (FIG. 1), the escape portion that escapes the upward burring portion B (FIG. 3A) already formed on the workpiece W. 1 is provided, the already formed upward burring portion B of the workpiece W placed on the ejector plate 21 is positioned below the escape portion 1, and a new upward burring portion B ′ (FIG. 3 ( D)), a pilot hole A ′ (FIG. 3A), which is a machining area on the workpiece W, is positioned at the punch center C, and the workpiece W is then punched (FIG. 3B). After being pressed by the work plate holder 39 made of urethane rubber on the die P side and the ejector plate 21 on the die die D side, the punch tip 38 (FIG. 3C) is lowered and the relief portion 1 at the lower end of the punch tip 38 is lowered. And position below it In the state where the previously formed upward burring portion B is released, the lower end of the inclined portion 1a constituting the escape portion 1 is the work W portion (A portion) outside the upper peripheral edge portion of the pilot hole A ′. , The lower peripheral edge of the pilot hole A ′ is brought into contact with the die chip 20, and then the punch chip 38 (FIG. 3D) is further lowered, so that the lowered punch chip 38 and the die The die chip 20 on the mold D side can project the pilot hole A ′ upward to form a new upward burring portion B ′, so that the punch tip 38 (FIG. 3C) is formed during processing. Even if the lowering portion is lowered, the provision of the relief portion 1 avoids the interference with the upward burring portion B already formed on the workpiece W, and does not crush it. Fig. 3 (B)) Even if the plate retainer 39 is lowered and rests on the upward burring portion B already formed on the workpiece W, the upward burring portion is made of urethane rubber and is elastic. B is not crushed. Therefore, when a new burring portion is formed on the workpiece, it is possible to avoid interference with the burring portion that has already been formed. Therefore, the interval between the burring portions can be reduced or increased. Therefore, manufacturing efficiency can be improved by manufacturing a product having a desired number and arrangement of burring portions.

  Therefore, according to the present invention, when a new burring portion is formed on the workpiece, it is possible to arbitrarily set the interval between the burring portions by making it possible to avoid interference with the burring portion already formed. Thus, there is an effect of manufacturing a product having a desired burring portion and providing a burring mold and a burring processing method for improving manufacturing efficiency.

  Further, according to the present invention, during processing (for example, FIG. 3C), the clearance 1 provided at the lower end of the descending punch tip 38 is in a state where the lower end of the inclined portion 1a has a smaller contact area. Then, since only the vicinity of the root A portion when the new upward burring portion B ′ is formed (for example, FIG. 3D), stress can be concentrated only on the root A portion, and the root A The ring-shaped dent attached to the portion becomes a groove and becomes inconspicuous, and the annular dent becomes a groove, so that the plate thickness of the workpiece W is reduced correspondingly, and the newly formed burring portion B The springback phenomenon in which ′ (for example, FIG. 3D) returns to the inside is suppressed, and these also have the effect of maintaining the value as a product.

The present invention will now be described by way of example with reference to the accompanying drawings.
FIG. 1 is a view showing a first embodiment of the present invention. A burring mold according to the present invention has a punch mold P and a die mold D, and is applied to, for example, a turret punch press.

  As is well known, the turret punch press has an upper turret (not shown) and a lower turret (not shown), each having a punch die and a die die, and synchronizing the upper turret and lower turret. By rotating, for example, a burring die according to the present invention can be selected at the punch center C.

  A ram (not shown) is provided above the punch die P in the punch center C. When the punch head of the punch die P is pressed by the ram, the die die D cooperates with, for example, a workpiece. In the state where the upward burring portion B already formed on W (FIG. 3A) is released to the escape portion 1 described later, the lower hole A ′ of the workpiece W is projected upward to form a new one. An upward burring portion B ′ (FIG. 3D) can be formed.

  The punch die P (FIG. 1) has a punch holder 30, and a punch tip 38 is inserted into a punch mounting hole 31 formed at the lower end of the punch holder 30.

  During punching, the punch tip 38 presses the outside of the upper peripheral edge of the pilot hole A ′ (FIG. 3C) and presses the lower peripheral edge of the pilot hole A ′. By cooperating with the die chip 20 on the D side, a new upward burring portion B ′ is formed (FIG. 3D).

  As shown in FIG. 1, the punch tip 38 is fixed to the lower end of the punch holder 30 via a punch plate 32 and a bolt 33, and an air blow guide is provided substantially at the center of the punch tip 38. A passage 34 is formed, and oil mist is sprayed toward the pilot hole A ′, which is a processing region on the workpiece W, during the processing (FIG. 3) through the conduction path 34 to form a new upward burring portion B ′. Can be easily formed.

  Further, a work plate presser 39 is provided on the lower half of the outer peripheral surface of the punch tip 38 (FIG. 1), and cooperates with an ejector plate 21 on the die die D side described later during processing (FIG. 3). The workpiece W is pressed (FIGS. 3B to 3D).

  The work plate holder 39 is made of, for example, urethane rubber and has elasticity, so that when the work is pressed (FIG. 3B), the work plate holder 39 is placed on the upward burring portion B already formed on the work W. Even so, the upward burring portion B is not crushed.

  Further, when the concave portion 2 is formed at the lower end of the punch tip 38 (FIG. 1) and the new upward burring portion B ′ is formed (FIG. 3D), the lower peripheral portion of the pilot hole A ′ is The die chip 20 that presses and molds the pilot hole A ′ upward enters the recess 2.

  As described above, the lower end of the punch tip 38 is formed with the escape portion 1 for escaping the upward burring portion B already formed on the workpiece W, the details of which are shown in FIG. .

  In FIG. 2, as shown by a broken line, the clearance between the upward burring portions formed on the workpiece W can be made as small as possible by forming the relief portion 1 by vertically cutting the lower end of the punch tip 38. it can.

  However, in this case, when forming a new upward burring portion B ′, the lower end of the punch tip 38 (FIG. 2) that presses the outer side of the upper peripheral edge of the pilot hole A ′ (FIG. 3C), The contact area with the pressed workpiece W portion is reduced, and stress concentrates on the pressed workpiece W portion, whereby an annular dent is attached to the workpiece W portion, and the value as a product is lowered.

For this purpose, as shown by a solid line in FIG. 2, the lower end of the punch tip 38 is notched in an inclined shape, for example, to provide an inclined portion 1a inclined upward at an angle of 30 ° with respect to the upper surface of the workpiece W. And the lower end of the inclined portion 1a and the portion A that is the workpiece W pressed by the inclined portion 1a, that is, the vicinity of the root A portion that is the rising portion of the new upward burring portion B ' Configured to contact.
As a result, the contact area with the workpiece W portion is further reduced, stress can be concentrated only on the base A portion of the new upward burring portion B ′, and the annular dent described above is formed in a groove shape. In addition, the dents were made inconspicuous, and the product value was retained.

  That is, the escape portion 1 has an inclined portion 1a, the lower end of which can be in contact with the upper surface of the workpiece W, and the lower end is in contact with only the vicinity of the root A portion of the workpiece W. The inclined portion 1a is inclined upward from the lower end.

  With this configuration, during processing, the upward burring portion B already formed on the workpiece W (FIG. 3A) is positioned below the vertical portion 1b and the horizontal portion 1c constituting the escape portion 1, and A pilot hole A ′, which is a processing region for forming a new upward burring portion B ′ (FIG. 3D), is positioned at the punch center C (FIG. 3A).

  Thus, when the punch tip 38 (FIG. 3B) is lowered to form a new upward burring portion B ′ (FIG. 3C to FIG. 3D), the punch tip 38 (FIG. 3D) is already formed. Since the upward burring portion B that is present can escape to the escape portion 1, the upward burring portion B is not crushed.

  Therefore, according to the present invention, as described above, when a new burring portion is formed on the workpiece, it is possible to avoid interference with the burring portion that has already been formed. Can be arbitrarily set, a product having a desired burring portion can be manufactured, and the manufacturing efficiency can be improved.

  Further, during processing (FIG. 3C), the lower end of the inclined portion 1a constituting the escape portion 1 presses the A portion which is the work W portion outside the upper peripheral portion of the pilot hole A ′. As described above, when the contact area between the lower end of the inclined portion 1a (FIG. 2) and the A portion is further reduced, when a new upward burring portion B ′ (FIG. 3D) is formed, Since stress can be concentrated only on the A part which becomes the root, the annular dent attached to the base A part becomes a groove shape, the dent becomes inconspicuous, and the value as a product is maintained. .

  Further, as described above, the annular dent attached to the root A portion becomes a groove shape, so that the thickness of the workpiece W is reduced by the amount of the groove, and therefore, after the processing is finished (FIG. 3D). The punch mold P returns and the new upward burring part B ′ released from the restraining force of the molds P and D is restrained from returning to the inside, and this also holds the value of the product. Is done.

  On the other hand, a die mold D is provided at a position facing the punch mold P (FIG. 1).

  As is well known, the die mold D has an elastic member 23, for example, urethane rubber, inserted into the groove 26 of the die body 24, and an ejector plate 21 is provided on the urethane rubber 23. The upper position of the ejector plate 21 is regulated by a through bolt 22.

  A die chip 20 fixed with bolts 25 on the die main body 24 side is disposed at a substantially central portion of the ejector plate 21.

  The operation of the first embodiment of the present invention having the above configuration will be described below with reference to FIG.

  In this case, as shown in the drawing, an upward burring portion B is already formed on the workpiece W, and a new upward burring portion B ′ (FIG. 3D) is formed in the vicinity of the upward burring portion B. It is assumed that a pilot hole A ′, which is a processing region for this purpose (FIG. 3A), is stamped and formed.

  Such a workpiece W is placed on the ejector plate 21 on the die mold D side, and the already formed upward burring portion B is disposed on the lower end of the punch tip 38 on the punch mold P side. And the prepared hole A ′, which is the processing area, is positioned at the punch center C.

  In this state, by lowering the punch die P, the workpiece W is pressed by the workpiece plate presser 39 (FIG. 3B) and the die plate D ejector plate 21.

  At this time, as shown in the figure, there is an upward burring portion B already formed on the workpiece W below the workpiece plate presser 39, and even if the workpiece plate presser 39 is on the upward burring portion B, As described above, since the work plate presser 39 is formed of urethane rubber, the work plate presser 39 is deformed along the upward burring portion B by its elasticity, and does not crush it.

  Next, when the punch tip 38 is lowered, the punch tip 38 (FIG. 3C) escapes the upward burring portion B by the escape portion 1 at the lower end thereof, and the escape portion becomes the pilot hole A ′. When the workpiece W is pressed in contact with only the vicinity of the base A portion, which is outside the upper peripheral edge of the workpiece, the workpiece W held by the workpiece plate holder 39 and the ejector plate 21 is also lowered. If the descent continues, the die chip 20 on the die mold D side fixed below contacts the lower peripheral edge of the pilot hole A ′.

  At this stage, the work plate holder 39 is deformed and spreads in the left-right direction due to its elasticity, and has a beer barrel shape.

  When the punch tip 38 is further lowered, the punch tip 38 (FIG. 3 (D)) that descends in a state where the upward burring portion B already formed on the workpiece W is released to the escape portion 1, and a fixed die tip. 20, the lower hole A ′ is formed so as to protrude upward, whereby a new upward burring portion B ′ is formed. At this time, the entire workpiece W is further lowered.

  FIG. 4 is a view showing a second embodiment of the present invention. The difference from the first embodiment (FIGS. 1 to 3) described above is that a relief portion 3 is provided on the die die D side. At the same time, after forming the prepared hole A ′ (FIG. 6C) in the escape portion 3 in a state where the downward burring portion G already formed on the workpiece W is released, a new downward burring portion G ′ is formed. (FIG. 6D) is formed.

  In FIG. 4, the burring die according to the present invention has a punch die P and a die die D as in the first embodiment, and is applied to, for example, a turret punch press.

  The punch die P has a punch guide 40, and a work plate presser 45 is provided at the lower end of the punch guide 40. During processing (FIG. 6), a support die on the die die D side described later is provided. In cooperation with 52, the work W is pressed.

  A punch body 41 is built in the punch guide 40 (FIG. 4), and a punch tip 42 is inserted into a punch mounting hole 49 formed at the lower end of the punch body 41.

  The punch tip 42 has a punched portion 47 at the tip and a molded portion 48 that extends continuously upward from the punched portion 47.

  With this configuration, when the punch tip 42 is processed (FIG. 6), the punching portion 47 punches out the processing region (FIG. 6C) to form the pilot hole A ′, and then the molding portion 48 has the pilot hole. A new downward burring portion G ′ is formed by cooperating with the protruding portion of the support die 52 that presses the upper peripheral edge of A ′ and presses the outside of the lower peripheral edge of the lower hole A ′ (see FIG. 6 (D)).

  As shown in FIG. 4, the punch tip 42 is fixed to the lower end of the punch body 41 via a punch plate 43 and a bolt 44. A blow conduction path 46 is formed, and oil mist is sprayed toward the machining area on the workpiece W through the conduction path 46 during machining (FIG. 6), and the pilot hole A ′ (FIG. 6 (C )) A new downward burring portion G ′ (FIG. 6D) is easily formed.

  On the other hand, a die mold D is provided at a position facing the punch mold P (FIG. 4).

  As is well known, the die mold D has a support die 52 fixed to a die plate 50 with bolts 51, and a protrusion at the tip of the support die 52 is already formed on the workpiece W. An escape portion 3 for releasing the downward burring portion G is formed, and details thereof are shown in FIG.

  In FIG. 5, as shown by a broken line, if the relief portion 3 is formed by cutting out the protruding portion of the support die 52 vertically, the interval between the downward burring portions formed on the workpiece W is made as small as possible. Can do.

  However, in this case, similarly, when a new downward burring portion G ′ is formed, the protruding portion of the support die 52 (FIG. 6C) that presses the outside of the lower peripheral portion of the pilot hole A ′ (FIG. 6C). The contact area between the upper end of 5) and the pressed work W portion is reduced, and stress concentrates on the pressed work W portion, so that an annular dent is attached to the work W portion as a product. The value of is reduced.

For this purpose, as shown by the solid line in FIG. 5, the upper end of the protruding portion of the support die 52 is notched in an inclined shape, for example, an inclined portion inclined downward at an angle of 30 ° and 45 ° with respect to the lower surface of the workpiece W. 3a and 3b are provided to form a relief portion 3 which is inclined as a whole, and the upper end of the innermost inclined portion 3a and the A portion which is a work W portion pressed by the upper portion, that is, the rising of a new downward burring portion G ′ It comprised so that only the vicinity of the fundamental A part which is a part might contact.
As a result, the contact area with the work W portion is further reduced, and stress can be concentrated only on the root A portion of the new downward burring portion G ′. The dent was made inconspicuous, and the product value was retained.

  That is, the escape portion 3 has a convex inclined portion composed of an innermost inclined portion 3a and an inclined portion 3b that is continuous with the inclined portion 3b, and has an upper end of the innermost inclined portion 3a. The lower surface of the workpiece W can be contacted, and the upper end is in contact with only the vicinity of the root A portion of the workpiece W, and the convex inclined portion extends downward from the upper end of the innermost inclined portion 3a. It is inclined to.

  Similarly, with this configuration, during machining, the downward burring portion G already formed on the workpiece W (FIG. 6A) is positioned above the inclined portion 3b and the horizontal portion 3c constituting the escape portion 3. At the same time, the processing area for forming the pilot hole A ′ and the new downward burring portion G ′ (FIG. 6D) is positioned at the punch center C (FIG. 6A). Keep it.

  As a result, when the punch tip 42 (FIG. 6C) is lowered to form the prepared hole A ′, and the new downward burring portion G ′ is formed, the previously formed downward burring portion is also formed. Since G has escaped to the escape portion 3 from the beginning (FIG. 6A), the downward burring portion G is not crushed.

  Therefore, according to the present invention, similarly, when a new burring portion is formed on the workpiece, it is possible to avoid interference with the burring portion that has already been formed. By enabling the setting, a product having a desired burring portion can be manufactured, and the manufacturing efficiency can be improved.

  Similarly, during processing (FIG. 6C), the upper end of the innermost inclined portion 3a of the convex inclined portions constituting the escape portion 1 is outside the lower peripheral edge portion of the pilot hole A ′. The portion A which is the workpiece W portion is pressed. As described above, the contact area between the upper end of the innermost inclined portion 3a (FIG. 5) and the portion A is further reduced, so that a new downward burring is performed. When the portion G ′ is formed (FIG. 6D), stress can be concentrated only on the A portion which is the root of the portion G ′, so that the annular dent on the root A portion has a groove shape. Thus, the dent becomes inconspicuous, and the value as a product is maintained.

  Further, similarly, as described above, the annular dent attached to the root A portion becomes a groove shape, so that the plate thickness of the workpiece W is reduced by the amount of the groove. (D)) The punch mold P is restored, and the springback phenomenon in which the new downward burring portion G ′ released from the restraining force of the molds P and D tries to return to the inside is suppressed. The value of is retained.

  An inner ejector 53 urged upward is provided through a spring 54 seated on the die plate 50 at a substantially central portion of the support die 52 (FIG. 4).

  As is well known, the inner ejector 53 is released from its restraining force when the punch tip 42 after completion of machining (FIG. 6D) is raised and returned to its original position. 54, and the newly formed downward burring portion G ′ is returned to the original position while being placed on the outer upper surface of the upper end of the opening 55 (FIG. 6A). Equivalent).

  The operation of the second embodiment of the present invention having the above configuration will be described below with reference to FIG.

  In this case, as shown in the figure, a downward burring portion G has already been formed on the workpiece W, and a pilot hole A ′ is formed in the vicinity of the downward burring portion G (FIG. 6C), and then a new one is formed. A downward burring portion G ′ is formed (FIG. 6D).

  Such a workpiece W (FIG. 6A) is placed on the protruding portion of the support die 52 on the die die D side, and the already formed downward burring portion G is provided at the upper end of the protruding portion. In addition to positioning above the relief portion 3, a processing region for forming the pilot hole A ′ and (FIG. 6C) a new downward burring portion G ′ (FIG. 6D) is defined as a punch center. Position to C (FIG. 6A).

  From this time until the end of machining (FIGS. 6A to 6D), the protruding portion of the support die 52 is in contact with the lower surface of the workpiece W in the machining area positioned at the punch center C, and The upper end of the innermost inclined portion 3a constituting the escape portion 3 formed in the protruding portion is in contact with the lower surface of the workpiece W only in the vicinity of the above-described root A portion.

  In this state, by lowering the punch die P, the downward burring portion G already formed by the work plate presser 45 (FIG. 6B) and the support die 52 on the die die D side is moved away from the escape portion 3. Hold the workpiece W that has been escaped.

  At this time, as shown in the figure, the downward burring portion G already formed on the workpiece W is positioned on the opposite side of the workpiece W with respect to the workpiece W. Therefore, the downward burring portion G is lowered. The work plate holder 45 is not crushed.

  Next, when the punch tip 42 is lowered (FIG. 6 (C)), the punching portion 47 punches out the processing region on the workpiece W to form the pilot hole A ′, and then the molding portion 48 becomes the pilot hole. By abutting the upper peripheral edge portion of A ′ and pressing the upper peripheral edge portion, the lower hole A ′ is pushed in the state where the outside of the lower peripheral edge portion of the lower hole A ′ is pressed by the protruding portion of the support die 52. A downward projecting molding is performed to form a new downward burring portion G ′ (FIG. 6D).

  When the punch tip 42 having the new downward burring portion G ′ is further lowered, the molding portion 48 presses the inner ejector 53, and the inner ejector 53 is lowered against the urging force of the spring 54. As described above, when the punch tip 42 is raised and returned to the original position, the inner ejector 53 is raised by the urging force of the spring 54, and a newly formed downward burring portion G ′ is formed. Is returned to the original position (corresponding to FIG. 6A).

  As described above, according to the present invention, when a new burring portion is formed on a workpiece, it is possible to arbitrarily set the interval between the burring portions by making it possible to avoid interference with the burring portion already formed. Thus, it is useful when manufacturing a product having a desired burring portion and improving the manufacturing efficiency, and a relief portion for escaping the upward burring portion or the downward burring portion already formed on the workpiece is used as a punch mold or It is used in burring molds that are provided in a die mold and the relief portion is formed in an inclined shape. Specifically, not only a turret punch press but also a punch press that processes with a single mold, and further to the side The present invention is also applied to a single punch press in which a plurality of dies are stocked and a necessary single die is taken out from the dies.

It is a figure which shows 1st Example of this invention. It is detail drawing of the escape part 1 provided in the punch metal mold | die P of FIG. It is operation | movement explanatory drawing of FIG. It is a figure which shows 2nd Example of this invention. It is detail drawing of the escape part 3 provided in the die metal mold | die D of FIG. It is operation | movement explanatory drawing of FIG. It is a subject explanatory drawing of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Relief part on the punch die P side 1a Inclined part 1b Vertical part 1c Horizontal part 2 Recessed part 3 Relief part on the die die D side 3a First inclined part 3b Second inclined part 3c Horizontal part 20 Die chip 21 Ejector plate 22 Through bolt 23 Urethane rubber 24 Die body 25, 33, 44, 51 Bolt 26 Groove 30 Punch holder 31, 49 Punch mounting hole 32, 43 Punch plate 34, 46 Conduction path 38, 42 Punch tip 39, 45 Work plate holder 40 Punch guide 41 Punch body 47 Punching part 48 Molding part 50 Die plate 52 Support die 53 Inner ejector 54 Spring 55 Opening A 'pilot hole B, G Burring part B', G 'already formed on workpiece W New burring part D Die mold P Punch mold W Workpiece

Claims (4)

The punch mold or the die mold is provided with a relief portion that is constituted by a punch die and a die die and escapes the upward burring portion or the downward burring portion already formed on the workpiece, and the relief portion is an inclined portion. the a, the inclined portion, an annular dent the lower end or the upper end attaches to該根present I contactable der only near the base is a rising portion of a new upward burring part or downward burring of the workpiece in a groove shape A burring mold characterized by being an annular groove forming portion to be formed . A burring method using the burring mold according to claim 1,
(1) The upward burring portion or downward burring portion already formed on the workpiece is positioned below or above the relief portion provided in the punch die or die die, and a new upward burring portion or downward After positioning the processing area on the workpiece to form the burring part at the punch center,
(2) Hold the workpiece with a punch die and a die die,
(3) Thereafter, the punch tip on the punch die side is lowered, and the above-formed upward burring portion or downward burring portion on the pressed workpiece by the lowered punch tip and a predetermined member on the die die side. In the state where the annular groove forming portion which is the lower end or the upper end of the inclined portion constituting the escape portion is brought into contact only with the vicinity of the base of the new upward burring portion or the downward burring portion. A burring method characterized in that a new upward burring portion or downward burring portion is formed by projecting an upper processing region upward or downward. In (1) above, the pilot hole, which is the machining area on the workpiece, is positioned at the punch center. In (2), the workpiece is pressed by the workpiece plate presser on the punch die side and the ejector plate on the die die side. In 3), the punch tip is lowered, and the above-formed upward burring portion positioned below the escape portion at the lower end of the punch tip is allowed to escape and the lower end of the inclined portion constituting the escape portion. The annular groove forming part presses only the vicinity of the base of the workpiece, and then further lowers the punch tip, and the lower hole is projected upward by the lower punch tip and the die tip on the die mold side, and newly formed. The burring method according to claim 2, wherein the upward burring portion is formed. In the above (2), the already formed downward burring portion is released to the escape portion, and the annular groove forming portion that is the upper end of the inclined portion constituting the escape portion is in contact with only the vicinity of the root. The workpiece is pressed with a work plate press on the punch die side and a support die on the die die side, and in (3), the punch tip is lowered, and the processing area on the workpiece is punched with the lowered punch tip, 3. A burring method according to claim 2, wherein after forming the pilot hole, the pilot hole and the support die are used to project the pilot hole downward and form a new downward burring part.

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