JP2021142560A - Burring processing material manufacturing method, core for burring processing and burring processing device - Google Patents

Abstract

To suppress a core from being broken when inserting the core into a member in applying burring processing to a member, and appropriately make the core contact an inner wall of the member by reducing a gap between the core and the inner wall of the member.SOLUTION: When applying burring processing to a member having a first wall part and a second wall part which are parallel to each other, a first core is inserted through one end sides of the first wall part and the second wall part and a second core is through the other end sides and tip parts of the cores are butted to each other. When inserting the first core and the second core into a space between the first wall part and the second wall part, contact surfaces of the cores are slid while contacting the surfaces with the first wall part and the second wall part at the same time. The cores comprise recessed portions at the tip parts thereof, where when the tip parts of the cores are butted to each other, the recessed portions form holes. Utilizing the holes, the first wall part and the second wall part are subjected to burring processing. After the burring processing, the first core and the second core may be pulled out from the inside of the member.SELECTED DRAWING: Figure 2A

Description

The present application discloses a method for producing a burring processed material, a core for burring processing, and a burring processing apparatus.

As disclosed in Patent Documents 1 to 4, a technique is known in which a holding material as a mold is inserted inside a member and then burring is performed. As shown in FIG. 1, in the prior art, a holding material is arranged inside the member before the burring process is performed, and a tapered (wedge-shaped) driving material is inserted into the holding material. It is pressed against the holding material, the holding material is moved toward the inner wall of the member, and the holding material is brought into contact with the inner wall of the member.

Japanese Unexamined Patent Publication No. 2015-039716 International Publication No. 2015/115514 Japanese Unexamined Patent Publication No. 2016-022517 Japanese Unexamined Patent Publication No. 2012-024768

When a tapered driving material is inserted into a holding material previously arranged inside the member and the driving material is pressed against the holding material as in the prior art, there is a concern that the tapered portion of the driving material may break. Further, depending on the shape of the member to be subjected to the burring process, it may not be possible to secure a sufficient inclination angle for the tapered driving material. In this case, even if the driving material is inserted into the holding material and pressed, the holding material cannot be appropriately moved toward the inner wall of the member, and the holding material cannot be properly brought into contact with the inner wall of the member. There is a risk.

The present application is one of the means for solving the above problems.
The first step of inserting the first core and the second core into the inside of the member and abutting the tip of the first core and the tip of the second core inside the member, and the above-mentioned A second step of obtaining a burring processed material by subjecting the member to burring in a state where the tip of the first core and the tip of the second core are butted inside the member. A method for producing a burring processed material, comprising a third step of extracting the first core and the second core from the burring processed material.
The member has a first wall portion and a second wall portion parallel to each other in a cross-sectional shape, has a first opening on one end side of the first wall portion and the second wall portion, and is on the other end side. Has a second opening in
A first contact surface in which the first core contacts the first wall portion, a second contact surface in contact with the second wall portion, and a first recess provided in the tip portion of the first core portion. The first contact surface and the second contact surface are parallel to each other.
A third contact surface in which the second core contacts the first wall portion, a fourth contact surface in contact with the second wall portion, and a second recess provided in the tip portion of the second core portion. The third contact surface and the fourth contact surface are parallel to each other.
When the tip of the first core and the tip of the second core are butted against each other, a hole is formed by the first recess and the second recess, and the central axis of the hole is the first. It is perpendicular to one contact surface, the second contact surface, the third contact surface, and the fourth contact surface.
In the first step, the first contact surface of the first core is brought into contact with the first wall portion, and the second contact surface of the first core is brought into contact with the second wall portion. The tip of the first core is pushed between the first wall and the second wall through the first opening on one end side of the member.
In the first step, the third contact surface of the second core is brought into contact with the first wall portion, and the fourth contact surface of the second core is brought into contact with the second wall portion. The tip of the second core is pushed between the first wall and the second wall through the second opening on the other end side of the member.
In the second step, the first burring process is performed on the first wall portion by utilizing the hole formed by abutting the tip portion of the first core and the tip portion of the second core. A hole is provided, and a second burring hole is provided in the second wall portion, where the first burring hole has a rising portion extending toward the second wall portion, and the second burring hole is formed. It has a rising portion extending toward the first wall portion, and has a rising portion.
In the third step, the first core is pulled out from the inside of the burring processed material through the first opening, and the second core is pulled out of the burring processed material through the second opening. Pull out from the inside of the
Disclose a method for manufacturing a burring processed material.

In the manufacturing method of the present disclosure, before the first core and the second core are inserted into the member, the distance X1 between the first contact surface and the second contact surface is the first wall portion. And may be longer than the distance Y between the first wall portion and the second wall portion, and the distance X2 between the third contact surface and the fourth contact surface is larger than the distance Y between the first wall portion and the second wall portion. It may be long, and in the first step, by pushing the first core and the second core between the first wall portion and the second wall portion, the first wall portion and the first wall portion are pushed. The distance Y from the two wall portions may be increased.

The present application is one of the means for solving the above problems.
In the cross-sectional shape, it has a first wall portion and a second wall portion parallel to each other, has a first opening on one end side of the first wall portion and the second wall portion, and has a second opening on the other end side. A core for burring that is inserted between the first wall portion and the second wall portion when burring is performed on a member having a portion.
A first core inserted through the first opening and a second core inserted through the second opening are provided.
The first contact surface in which the first core contacts the first wall portion, the second contact surface in contact with the second wall portion, and the first recess provided at the tip end portion of the first core portion. The first contact surface and the second contact surface are parallel to each other.
A third contact surface in which the second core contacts the first wall portion, a fourth contact surface in contact with the second wall portion, and a second recess provided at the tip end portion of the second core portion. The third contact surface and the fourth contact surface are parallel to each other.
When the tip of the first core and the tip of the second core are butted against each other, a hole is formed by the first recess and the second recess, and the central axis of the hole is the first. It is perpendicular to one contact surface, the second contact surface, the third contact surface, and the fourth contact surface.
Disclose the core for burring processing.

In the core of the present disclosure, before the first core and the second core are inserted into the member, the distance X1 between the first contact surface and the second contact surface is the first wall portion. And may be longer than the distance Y between the first wall portion and the second wall portion, and the distance X2 between the third contact surface and the fourth contact surface is larger than the distance Y between the first wall portion and the second wall portion. It may be long.

The present application discloses a burring processing apparatus including the core of the present disclosure as one of the means for solving the above-mentioned problems.

The apparatus of the present disclosure may include a first cylinder connected to the first core and a second cylinder connected to the second core, and the first cylinder may be used to provide the first cylinder. The child may be configured to move in a direction parallel to the first contact surface and the second contact surface, and the second cylinder allows the second core to move to the third contact surface and the fourth contact surface. It may be configured so that it can move in a direction parallel to the surface.

According to the technique of the present disclosure, when the core is inserted into the member when the member is subjected to the burring process, the core is unlikely to break. Further, it is difficult for a gap to be formed between the core and the inner wall of the member, and the core can be appropriately brought into contact with the inner wall of the member.

It is a figure for demonstrating the prior art. It is a figure for demonstrating the 1st process of the manufacturing method of a burring processed material. The cross-sectional structure of the member 10, the first core 21, and the second core 22 is shown schematically. For convenience of explanation, the existence of the outer mold is omitted. It is a figure for demonstrating the 1st process of the manufacturing method of a burring processed material. The planar configuration of the member 10, the first core 21, and the second core 22 is shown schematically. For convenience of explanation, the existence of the outer mold is omitted. It is a figure for demonstrating the 2nd process of the manufacturing method of a burring processed material. The cross-sectional structure of the member 10, the first core 21, the second core 22, and the burring processed material 30 is shown schematically. For convenience of explanation, the existence of the outer mold is omitted. It is a figure for demonstrating the 2nd process of the manufacturing method of a burring processed material. The planar configuration of the member 10, the first core 21, the second core 22, and the burring processed material 30 is shown schematically. For convenience of explanation, the existence of the outer mold is omitted. It is a figure for demonstrating the 3rd process of the manufacturing method of a burring processed material. The cross-sectional structure of the first core 21, the second core 22, and the burring processed material 30 is shown schematically. For convenience of explanation, the existence of the outer mold is omitted. It is a figure for demonstrating the 3rd process of the manufacturing method of a burring processed material. The plane configuration of the first core 21, the second core 22, and the burring processed material 30 is shown schematically. For convenience of explanation, the existence of the outer mold is omitted. It is a figure for demonstrating an example of the shape of a member. The appearance configuration of the member is shown schematically. It is a figure for demonstrating an example of the shape of a member. The planar configuration of the members is shown schematically. It is a figure for demonstrating an example of the shape of a member. The appearance configuration of the member is shown schematically. It is a figure for demonstrating an example of the shape of a member. The appearance configuration of the member is shown schematically. It is a figure for demonstrating an example of the shape of a member. The cross-sectional structure of the member is shown schematically. It is a figure for demonstrating an example of the shape of a member. The cross-sectional structure of the member is shown schematically. It is a figure for demonstrating an example of the shape of the 1st core and the 2nd core. The cross-sectional structure in which the first core 21 and the second core are butted against each other is schematically shown. It is a figure for demonstrating an example of the shape of the 1st core and the 2nd core. The plane configuration in which the first core 21 and the second core are butted against each other is schematically shown. It is a figure for demonstrating an example of the shape of the 1st core and the 2nd core. The cross-sectional structure in which the first core 21 and the second core are butted against each other is schematically shown. It is a figure for demonstrating an example of the shape of the 1st core and the 2nd core. The plane configuration in which the first core 21 and the second core are butted against each other is schematically shown. It is a figure for demonstrating an example of 1st process. The cross-sectional structure of the member 10 and the first core 21 is shown schematically. It is a figure for demonstrating an example of a burring processing apparatus. The cross-sectional structure of the device is shown schematically. For convenience of explanation, the existence of the outer mold is omitted.

1. 1. Manufacturing Method of Burling Processed Material In the manufacturing method of the burring processed material shown in FIGS. The first step of abutting the tip portion 21c of the child 21 and the tip portion 22c of the second core 22, and the tip portion 21c of the first core 21 and the tip portion 22c of the second core 22 inside the member 10. The second step of obtaining the burring processed material 30 by burring the member 10 in a state where the members 10 are butted against each other, and the third step of extracting the first core 21 and the second core 22 from the burring processed material 30. Be prepared.

As shown in FIGS. 2 to 4, the member 10 has a first wall portion 1 and a second wall portion 2 parallel to each other in a cross-sectional shape, and one end side of the first wall portion 1 and the second wall portion 2. Has a first opening 3a and a second opening 3b on the other end side.

As shown in FIGS. 2 to 4, the first core 21 has a first contact surface 21a in contact with the first wall portion 1, a second contact surface 21b in contact with the second wall portion 2, and a first middle element. It has a first recess 21d provided in the tip portion 21c of the child 21. The first contact surface 21a and the second contact surface 21b are parallel to each other.

As shown in FIGS. 2 to 4, the second core 22 has a third contact surface 22a in contact with the first wall portion 1, a fourth contact surface 22b in contact with the second wall portion 2, and a second center. It has a second recess 22d provided at the tip 22c of the child 22. The third contact surface 22a and the fourth contact surface 22b are parallel to each other.

As shown in FIGS. 2 to 4, when the tip portion 21c of the first core 21 and the tip portion 22c of the second core 22 are butted, the hole 23 is formed by the first recess 21d and the second recess 22d. It is formed. The central axis of the hole 23 is perpendicular to the first contact surface 21a, the second contact surface 21b, the third contact surface 22a, and the fourth contact surface 22b.

As shown in FIGS. 2A and 2B, in the first step, the first contact surface 21a of the first core 21 is brought into contact with the first wall portion 1, and the second contact surface 21b of the first core 21 is brought into contact with the first wall portion 1. Is in contact with the second wall portion 2, and the tip portion 21c of the first core 21 is placed between the first wall portion 1 and the second wall portion 2 via the first opening 3a on one end side of the member 10. Push into.

As shown in FIGS. 2A and 2B, in the first step, the third contact surface 22a of the second core 22 is brought into contact with the first wall portion 1, and the fourth contact surface 22b of the second core 22 is brought into contact with the first wall portion 1. To the second wall portion 2, the tip portion 22c of the second core 22 is connected to the first wall portion 1 and the second wall portion 2 through the second opening 3b on the other end side of the member 10. Push in between.

As shown in FIGS. 3A and 3B, in the second step, the hole 23 formed by abutting the tip portion 21c of the first core 21 and the tip portion 22c of the second core 22 is used. The first wall portion 1 is provided with the first burring hole 11a, and the second wall portion 2 is provided with the second burring hole 12a. Here, the first burring hole 11a has a rising portion 11b extending toward the second wall portion 2, and the second burring hole 12a has a rising portion 12b extending toward the first wall portion 1.

As shown in FIGS. 4A and 4B, in the third step, the first core 21 is pulled out from the inside of the burring processed material 30 through the first opening 3a, and through the second opening 3b. The second core 22 is pulled out from the inside of the burring processed material 30 to the outside.

1.1 Member The member 10 has a first wall portion 1 and a second wall portion 2 parallel to each other in cross-sectional shape, and a first opening 3a is provided on one end side of the first wall portion 1 and the second wall portion 2. And has a second opening 3b on the other end side. In the present application, "parallel" is not limited to perfect parallelism, but may be substantially parallel. That is, even if the first wall portion 1 and the second wall portion 2 are not completely parallel, they are regarded as parallel as long as they are within the margin of error allowed in industrial production. Specifically, when the angle formed by the first wall portion 1 and the second wall portion 2 is 0 ° ± 1 °, it is considered that the first wall portion 1 and the second wall portion 2 are parallel to each other. The same applies to "parallel" in the first core 21 and the second core 22, which will be described later. The member 10 may be bent or the like when the core 20 is inserted or after the core 20 is inserted.

In the member 10, the first wall portion 1 and the second wall portion 2 do not have to be parallel to each other in all directions, and may be parallel to each other in the cross-sectional shape. The first core 21 and the second core 22 can be inserted along the parallel wall portions 1 and 2 as long as they are parallel to each other in the cross-sectional shape. For example, even when the opening shape of the member 10 is a cylindrical shape or the like, the first wall portion 1 and the second wall portion 2 can be recognized in the cross-sectional shape, and the first wall portion 1 and the first wall portion 1 and the cross-sectional shape can be recognized. The second wall portions 2 can be parallel to each other.

As shown in FIGS. 2A and 2B, the member 10 has a first opening 3a on one end side of the first wall portion 1 and the second wall portion 2, and a second opening 3b on the other end side. Through these openings 3a and 3b, the first core 21 and the second core 22 can be inserted between the first wall portion 1 and the second wall portion 2. As shown in FIG. 2A, in the cross-sectional shape, the opening height of the first opening 3a may be the same as the distance Y between the first wall 1 and the second wall 2. Similarly, in the cross-sectional shape, the opening height of the second opening 3b may be the same as the distance Y between the first wall 1 and the second wall 2.

FIG. 5 shows an example of the shape of the member 10. As shown in FIG. 5, the member 10 includes a first wall portion 1 and a second wall portion 2 facing each other, and side wall portions 4 and 5 connecting the first wall portion 1 and the second wall portion 2. You may be. Further, the member 10 may be provided with the first opening 3a on one end side of the first wall portion 1, the second wall portion 2 and the side wall portions 4, 5 and the second opening 3b on the other end side. That is, the member 10 may be a tubular (hollow) member. The opening shape of the opening 3 is not particularly limited, and may be a quadrangular shape as shown in FIG. 5, a polygonal shape other than the quadrangular shape, or a circular shape. , The shape may be other than these. As shown in FIG. 5, the first wall portion 1 and the second wall portion 2 are parallel to each other. On the other hand, the side wall portion 4 and the side wall portion 5 may be parallel to each other as shown in FIG. 5A, or may not be parallel to each other as shown in FIGS. 5B and 5C. That is, as shown in FIG. 5B, the side wall portions 4 and 5 do not have to be parallel in the planar shape, or as shown in FIG. 5C, the side wall portions 4 and 5 are not parallel in the opening shape. You may.

In the member 10 shown in FIG. 5, in addition to the first opening 3a and the second opening 3b, the side walls 4 and 5 may be further provided with openings (not shown).

FIG. 6 shows another example of the shape of the member 10. As shown in FIG. 6, the member 10 includes a first wall portion 1 and a second wall portion 2 facing each other, and a side wall portion 4 connecting the first wall portion 1 and the second wall portion 2. May be good. In this case, the first wall portion 1 and the second wall portion 2 are held at predetermined intervals only by the side wall portion 4. Also in the member 10 shown in FIG. 6, the first wall portion 1 and the second wall portion 2 are parallel to each other, and the first opening 3a and the other end are on one end side of the first wall portion 1 and the second wall portion 2. A second opening 3b is provided on the side. As described above, the "opening" provided in the member 10 in the present application does not have to be defined by one closed region, and is a part of the opening shape as shown in FIG. May be interrupted.

FIG. 7 shows another example of the shape of the member 10. As shown in FIGS. 7A and 7B, the member 10 may have an enlarged portion 8 in which the distance between the wall portions facing each other is increased in the cross-sectional shape. Alternatively, the member 10 may have a curved surface in a cross-sectional shape other than the first wall portion 1 and the second wall portion 2. Even in such a case, the member 10 includes a first wall portion 1 and a second wall portion 2 parallel to each other at least in a portion to be burred, and one end side of the first wall portion 1 and the second wall portion 2. By providing the first opening 3a and the second opening 3b on the other end side, the first core 21 and the second core 22 are brought into contact with the first wall portion 1 and the second wall portion 2. , Can be inserted between the first wall portion 1 and the second wall portion 2.

As shown in FIGS. 2 and 3, the member 10 may have a first pilot hole 1a in the first wall portion 1 before the core 20 is inserted, and the member 10 may have a first pilot hole 1a in the second wall portion 2. 2 The pilot hole 2a may be provided, the first pilot hole 1a and the second pilot hole 2a may share a central axis, and the central axis is formed in the first wall portion 1 and the second wall portion 2. It may be perpendicular to it. Alternatively, after the first core 21 and the second core 22 are inserted into the member 10, pilot holes 1a and 2a may be provided in the member 10. The method of providing the prepared holes 1a and 2a is not particularly limited, and examples thereof include a method of punching the first wall portion 1 and the second wall portion 2 using a punch. The size and shape of the prepared holes 1a and 2a are not particularly limited, and may be appropriately determined in consideration of the shapes of the burring holes 11a and 12a and the heights of the rising portions 11b and 12b.

As shown in FIG. 2, in the member 10, a predetermined distance is provided between the first wall portion 1 and the second wall portion 2. In the member 10, the specific value of the distance Y between the first wall portion 1 and the second wall portion 2 is not particularly limited. The technique of the present disclosure is effective regardless of whether the distance Y is small or large, but it is considered that the technique is particularly effective when the distance Y is small. That is, when a conventional tapered driving material is used, if the distance Y is small, a sufficient inclination angle cannot be secured for the driving material. Therefore, even if the driving material is inserted into the holding material and pressed against the holding material, the holding material cannot be appropriately moved toward the inner wall of the member, and the holding material may not be properly brought into contact with the inner wall of the member. be. On the other hand, in the technique of the present disclosure, when the first core 21 and the second core 22 are inserted from the outside to the inside of the member 10, the first core 21 and the second core 22 are inserted into the member 10. Since the first core 21 and the second core 22 are slid while being in contact with the inner wall of the member 10, the first core 21 and the second core 22 can be appropriately brought into contact with the inner wall of the member 10.

The member 10 is made of a material that can be burred. For example, the member 10 may be a metal material or a steel material. The thicknesses of the first wall portion 1 and the second wall portion 2 (thicknesses T1 and T2, see FIG. 10) are not particularly limited.

1.2 First core As shown in FIGS. 2 to 4, the first core 21 has a first contact surface 21a in contact with the first wall portion 1 and a second contact in contact with the second wall portion 2. It has a surface 21b. The first contact surface 21a and the second contact surface 21b are parallel to each other. Therefore, with the first core 21 inserted inside the member 10, the first wall portion 1 and the second wall portion 2 of the member 10 and the first contact surface 21a and the second contact surface of the first core 21 21b is parallel to each other. Conventionally, a tapered (wedge-shaped) drive body having an inclined portion has been used, whereas in the first core 21 of the present disclosure, the first contact surface 21a and the second contact surface 21b are parallel to each other. .. Therefore, as compared with the conventional drive body, the first core 21 can easily secure the rigidity from one end to the entire other end. Therefore, when the first core 21 is inserted into the member 10, the first core 21 is hard to break.

As shown in FIGS. 2 to 4, the first core 21 has a first recess 21d at its tip 21c. The first recess 21d can be combined with the second recess 22d, which will be described later, to form the hole 23, and after the burring process, the rising portions 11b, 12b of the burring process holes 11a, 12a are in the first middle. The shape of the child 21 is not particularly limited as long as it can be removed. For example, as shown in FIGS. 2 to 4, the first recess 21d has a plan shape from one end (the tip of the first core 21) to the other end (the end opposite to the tip of the first core 21). It may be a semicircular recess that dents toward.

The overall shape of the first core 21 can be appropriately determined according to the internal shape of the member 10. For example, when the member 10 includes a first wall portion 1 and a second wall portion 2 facing each other, and side wall portions 4 and 5 connecting the first wall portion 1 and the second wall portion 2 (see FIG. 5). When the first core 21 is inserted into the member 10, the first contact surface 21a comes into contact with the first wall portion 1, and the second contact surface 21b comes into contact with the second wall portion 2. The side surface of the first core 21 may come into contact with the side wall portions 4 and 5. That is, in a state where the first core 21 is inserted inside the member 10, the first core 21 is in contact with a portion of the member 10 other than the first wall portion 1 and the second wall portion 2. May be good.

The first core 21 is made of a material having the required rigidity and the like. For example, the first core 21 may be made of metal, ceramic, or resin. Further, when the first core 21 is harder than the member 10, it is possible to prevent the first core 21 from being scratched.

1.3 Second core As shown in FIGS. 2 to 4, the second core 22 has a third contact surface 22a in contact with the first wall portion 1 and a fourth contact in contact with the second wall portion 2. It has a surface 22b. The third contact surface 22a and the fourth contact surface 22b are parallel to each other. Therefore, in a state where the second core 22 is inserted inside the member 10, the first wall portion 1 and the second wall portion 2 of the member 10 and the third contact surface 22a and the fourth contact surface of the second core 22 22b is parallel to each other. Conventionally, a tapered (wedge-shaped) drive body having an inclined portion has been used, whereas in the second core 22 of the present disclosure, the third contact surface 22a and the fourth contact surface 22b are parallel to each other. .. Therefore, as compared with the conventional drive body, the second core 22 can easily secure the rigidity from one end to the entire other end. Therefore, when the second core 22 is inserted into the member 10, the second core 22 is unlikely to break.

As shown in FIGS. 2 to 4, the second core 22 has a second recess 22d at its tip 22c. The second recess 22d can form the hole 23 in combination with the first recess 21d described above, and the rising portions 11b, 12b of the burring holes 11a, 12a to the second middle after the burring process. The shape of the child 22 is not particularly limited as long as it can be removed. For example, as shown in FIGS. 2 to 4, the second recess 22d has a plan shape from one end (the tip of the second core 22) to the other end (the end opposite to the tip of the second core 22). It may be a semicircular recess that dents toward.

The overall shape of the second core 22 can be appropriately determined according to the internal shape of the member 10. For example, when the member 10 includes a first wall portion 1 and a second wall portion 2 facing each other, and side wall portions 4 and 5 connecting the first wall portion 1 and the second wall portion 2 (see FIG. 5). When the second core 22 is inserted into the member 10, the third contact surface 22a comes into contact with the first wall portion 1, and the fourth contact surface 22b comes into contact with the second wall portion 2. The side surface of the second core 22 may come into contact with the side wall portions 4 and 5. That is, in a state where the second core 22 is inserted inside the member 10, the second core 22 is in contact with a portion of the member 10 other than the first wall portion 1 and the second wall portion 2. May be good.

The second core 22 is made of a material having the required rigidity and the like. For example, the second core 22 may be made of metal, ceramic, or resin. Further, when the second core 22 is harder than the member 10, it is possible to prevent the second core 22 from being scratched. The first core 21 and the second core 22 may be made of the same material as each other, or may be made of different materials from each other.

1.4 When the tip of the first core and the tip of the second core are butted When the tip 21c of the first core 21 and the tip 22c of the second core 22 are butted The hole 23 is formed by the first recess 21d and the second recess 22d. The central axis of the hole 23 is perpendicular to the first contact surface 21a, the second contact surface 21b, the third contact surface 22a, and the fourth contact surface 22b. The form (opening shape) of the hole 23 may be appropriately determined according to the shapes of the burring holes 11a and 12a. For example, as shown in FIGS. 2 and 3, the opening shape of the hole 23 can be circular. The depth of the hole 23 is not particularly limited, and may be appropriately determined according to the heights of the rising portions 11b and 12b of the burring hole.

As shown in FIGS. 8A and 8B, the hole 23 communicates between the first contact surface 21a and the second contact surface 21b (and between the third contact surface 22a and the fourth contact surface 22b). You may. That is, one through hole may be formed by the first recess 21d and the second recess 22d.

Alternatively, the hole 23 may be a recess provided on the front and back surfaces of the core. That is, as shown in FIGS. 9A and 9B, when the tip portion 21c of the first core 21 and the tip portion 22c of the second core 22 are butted, they are on the first contact surface 21a and the third contact surface 22a side. A recess 23a may be provided as the hole 23, and a recess 23b may be provided as the hole 23 on the side of the second contact surface 21b and the fourth contact surface 22b. Also in this case, the recess 23a and the recess 23b share the central axis.

1.5 First Step As shown in FIGS. 2A and 2B, in the first step, the first contact surface 21a of the first core 21 is brought into contact with the first wall portion 1, and the first core 21 is brought into contact with the first wall portion 1. While the second contact surface 21b of the first core 21 is in contact with the second wall portion 2, the tip portion 21c of the first core 21 is moved to the first wall portion 1 and the second through the first opening 3a on one end side of the member 10. Push it between the wall and the wall 2. Further, while the third contact surface 22a of the second core 22 is in contact with the first wall portion 1 and the fourth contact surface 22b of the second core 22 is in contact with the second wall portion 2, the member 10 The tip portion 22c of the second core 22 is pushed between the first wall portion 1 and the second wall portion 2 via the second opening 3b on the other end side. That is, in the first step, both the first core 21 and the second core 22 come into contact with the first wall portion 1 and the second wall portion 2 at the same time. As a result, the first core 21 and the second core 22 can be appropriately brought into contact with the inner wall of the member 10. Although not shown, the member 10 may be restrained from the outside by an outer mold in the first step.

In the first step, when the first core 21 and the second core 22 are inserted into the member 10, the first wall portion 1 and the second wall portion of the member 10 are formed by the first core 21 and the second core 22. You may try to push 2 out. For example, as shown in FIGS. 2A and 10, the distance X1 between the first contact surface 21a and the second contact surface 21b is before the first core 21 and the second core 22 are inserted into the member 10. The distance X2 between the third contact surface 22a and the fourth contact surface 22b is longer than the distance Y between the first wall portion 1 and the second wall portion 2, and the distance X2 between the first wall portion 1 and the second wall portion 2 is Y. By pushing the first core 21 and the second core 22 between the first wall portion 1 and the second wall portion 2 in the first step, the first wall portion 1 and the second wall portion 2 are longer than each other. The distance Y from 2 may be increased. In this case, the ratio of the distance X to the distance Y is not particularly limited. Although it depends on the thicknesses T1 and T2 of the member 10, for example, the distance X may be 1.01 times or more, 1.02 times or more, or 1.25 times or less the distance Y. It may be 1.10 times or less. In this way, when the first core 21 and the second core 22 are inserted into the member 10, the surface of the burring processed material 30 obtained after the burring process is obtained by expanding the inside of the member 10 by the cores 21 and 22. The properties and appearance will be even better. In addition, unnecessary deformation of the member 10 during burring can be further suppressed. As shown in FIG. 10, when the inside of the member 10 is expanded by the cores 21 and 22, the cores 21 and 22 can be smoothly inserted between the first wall portion 1 and the second wall portion 2. The corners of the tips of the cores 21 and 22 may be tapered (or rounded).

The first core 21 and the second core 22 may be inserted into the member 10 manually, or mechanically using a cylinder mechanism, a robot, or the like. In the prior art, as described above, it was necessary to insert the tapered driving material into the holding material and move the holding material in a direction perpendicular to the insertion direction of the driving material. On the other hand, in the manufacturing method of the present disclosure, the first core 21 and the second core 22 are simply inserted by sliding the first core 21 and the second core 22 into the first wall portion 1 and the second wall portion 2. The second core 22 can be arranged at an appropriate position on the member 10.

1.6 Second step As shown in FIGS. 3A and 3B, in the second step, a hole formed by abutting the tip portion 21c of the first core 21 and the tip portion 22c of the second core 22. 23 is used to provide a first burring hole 11a in the first wall portion 1 and a second burring hole 12a in the second wall portion 2. Here, the first burring hole 11a has a rising portion 11b extending toward the second wall portion 2, and the second burring hole 12a has a rising portion 12b extending toward the first wall portion 1. That is, the burring holes 11a and 12a are inward burring holes having rising portions 11b and 12b toward the inside of the member 10. Although not shown, the member 10 may be restrained from the outside by an outer mold in the second step.

In the second step, the specific method for providing the burring holes 11a and 12a in the wall portions 1 and 2 is not particularly limited. Burring holes 11a and 12a can be provided by a conventional method. For example, as shown in FIG. 3A, burring holes 11a and 12a can be provided by punching the pilot holes 1a and 2a of the wall portions 1 and 2 with burring punches 41 and 42. When punching with the burring punches 41 and 42, it is preferable that the central axes of the burring punches 41 and 42 coincide with the central axes of the prepared holes 1a and 2a provided in the member 10 and the central axes of the holes 23. In this case, the first burring hole 11a and the second burring hole 12a formed in the second step share the central axis.

1.7 Third step As shown in FIGS. 4A and 4B, in the third step, the first core 21 is pulled out from the inside of the burring processed material 30 through the first opening 3a, and the second step is performed. The second core 22 is pulled out from the inside of the burring processed material 30 through the opening 3b. The first core 21 and the second core 22 may be pulled out manually or mechanically using a cylinder mechanism, a robot, or the like. When the first core 21 and the second core 22 are pulled out, the tip portion 21c of the first core 21 and the tip portion 22c of the second core 22 are formed in the rising portions 11b and 12b of the burring holes 11a and 12a. However, by applying force to the first core 21 and the second core 22, the first core 21 and the second core 22 can be removed from the rising portions 11b and 12b. Although not shown, the member 10 may be restrained from the outside by an outer mold in the third step.

In the prior art, after burring, a tapered driving material is extracted from the holding material, the holding materials are moved so as to be close to each other, and then the holding material is passed through between the rising portions of the burring holes. It was necessary to extract it, and the structure and process were complicated. On the other hand, in the manufacturing method of the present disclosure, the first core 21 and the second core 22 are simply pulled out while sliding on the first wall portion 1 and the second wall portion 2. The second core 22 can be easily pulled out from the inside of the member 10 to the outside.

1.8 Burring processing material As described above, the member 10, the first core 21, and the second core 22 are used, and the member 10 is subjected to burring processing through the first to third steps to perform burring processing. The material 30 can be easily manufactured. According to the technique of the present disclosure, a gap is unlikely to occur between the member 10 and the first core 21 and between the member 10 and the second core 22, and the first core 21 and the inner wall of the member 10 The burring process can be performed while appropriately contacting the second core 22. As a result, a burring processed material 30 having excellent surface properties and appearance can be obtained.

2. Core for burring processing The technology disclosed in this disclosure also has an aspect as a core for burring processing. As shown in FIGS. 2 to 4, the burring core of the present disclosure has a first wall portion 1 and a second wall portion 2 parallel to each other in a cross-sectional shape, and the first wall portion 1 and the second wall portion 1 and the second wall portion 2 are parallel to each other. When burring is performed on a member 10 having a first opening 3a on one end side of the wall portion 2 and a second opening 3b on the other end side, the first wall portion 1 and the second wall portion 1 and the second wall portion It is a core for burring that is inserted between 2. The burring processing core includes a first core 21 inserted through the first opening 3a and a second core 22 inserted through the second opening 3b. The first core 21 is provided on a first contact surface 21a that contacts the first wall portion 1, a second contact surface 21b that contacts the second wall portion 2, and a tip portion 21c of the first core portion 21. It has a first recess 21d, and the first contact surface 21a and the second contact surface 21b are parallel to each other. The second core 22 is provided on the third contact surface 22a that contacts the first wall portion 1, the fourth contact surface 22b that contacts the second wall portion 2, and the tip portion 22c of the second core portion 22. It has a second recess 22d, and the third contact surface 22a and the fourth contact surface 22b are parallel to each other. When the tip portion 21c of the first core 21 and the tip portion 22c of the second core 22 are butted, the hole 23 is formed by the first recess 21d and the second recess 22d, and the central axis of the hole 23 is the first. It is perpendicular to the first contact surface 21a, the second contact surface 21b, the third contact surface 22a, and the fourth contact surface 22b.

The configurations of the first core 21 and the second core 22 constituting the core are as described above. For example, before inserting the first core 21 and the second core 22 into the member 10, the distance X1 between the first contact surface 21a and the second contact surface 21b is the first wall portion 1 and the second wall portion. The distance X2 between the third contact surface 22a and the fourth contact surface 22b may be longer than the distance Y between the first wall portion 1 and the second wall portion 2.

3. 3. Burling processing device The technology of the present disclosure also has an aspect as a burring processing device. FIG. 11 shows an example of the configuration of the burring processing apparatus. As shown in FIG. 11, the burring processing apparatus 100 includes the burring processing cores (first core 21 and second core 22) of the present disclosure.

As shown in FIG. 11, the burring processing apparatus 100 includes a first cylinder 51 connected to the first core 21 and a second cylinder 52 connected to the second core 22, and the first cylinder. The 51 allows the first core 21 to move in a direction parallel to the first contact surface 21a and the second contact surface 21b, and the second cylinder 52 causes the second core 22 to move to the third contact surface 22a and the third contact surface 22a. It may be configured so that it can move in a direction parallel to the fourth contact surface 22b. The configurations of the cylinders 51 and 52 may be the same as those of known cylinders.

The burring processing apparatus 100 may have the same configuration as the conventional one except that it includes the cores (first core 21 and second core 22) of the present disclosure. For example, the burring processing apparatus 100 includes punches (not shown) for providing pilot holes 1a and 2a in the member 10, and burring punches 41 and 42 (not shown) for providing burring holes 11a and 12a in the member 10. (See FIG. 3A), an outer mold (not shown) that restrains the member 10 from the outside, and the like may be provided.

4. Supplement Even the methods shown below are considered to have some effect. That is, the method of the present disclosure is
The first step of inserting the first core and the second core inside the member and abutting the tip of the first core and the tip of the second core inside the member.
A second step of obtaining a burring processed material by subjecting the member to burring in a state where the tip of the first core and the tip of the second core are butted inside the member. ,
A third step of extracting the first core and the second core from the burring processed material, and
With
The member has a first wall portion and a second wall portion facing each other in a cross-sectional shape, has a first opening on one end side of the first wall portion and the second wall portion, and has a first opening on the other end side. Has a second opening and
A first contact surface in which the first core contacts the first wall portion, a second contact surface in contact with the second wall portion, and a first recess provided in the tip portion of the first core portion. And have
A third contact surface in which the second core contacts the first wall portion, a fourth contact surface in contact with the second wall portion, and a second recess provided in the tip portion of the second core portion. And have
When the tip of the first core and the tip of the second core are butted against each other, a hole is formed by the first recess and the second recess.
In the first step, the first contact surface of the first core is brought into contact with the first wall portion, and the second contact surface of the first core is brought into contact with the second wall portion. The tip of the first core is pushed between the first wall and the second wall through the first opening on one end side of the member.
In the first step, the third contact surface of the second core is brought into contact with the first wall portion, and the fourth contact surface of the second core is brought into contact with the second wall portion. The tip of the second core is pushed between the first wall and the second wall through the second opening on the other end side of the member.
In the second step, the first burring process is performed on the first wall portion by utilizing the hole formed by abutting the tip portion of the first core and the tip portion of the second core. A hole is provided, and a second burring hole is provided in the second wall portion, where the first burring hole has a rising portion extending toward the second wall portion, and the second burring hole is formed. It has a rising portion extending toward the first wall portion, and has a rising portion.
In the third step, the first core is pulled out from the inside of the burring processed material through the first opening, and the second core is pulled out of the burring processed material through the second opening. Pull out from the inside of the
This is a method for manufacturing a burring processed material.

1 1st wall 2 2nd wall 3a 1st opening 3b 2nd opening 4 Side wall 5 Side wall 10 Member 11a 1st burring hole 11b Rising part 12a 2nd burring hole 12b Rising part 21 1st middle Child 21a First contact surface 21b Second contact surface 21c Tip portion 21d First recess 22 Second core 22a Third contact surface 22b Fourth contact surface 22c Tip 22d Second recess 30 Burling processed material 41, 42 Burling punch 51 1st cylinder 52 2nd cylinder 100 Burling processing equipment

Claims (6)

The first step of inserting the first core and the second core inside the member and abutting the tip of the first core and the tip of the second core inside the member.
A second step of obtaining a burring processed material by subjecting the member to burring in a state where the tip of the first core and the tip of the second core are butted inside the member. ,
A third step of extracting the first core and the second core from the burring processed material, and
With
The member has a first wall portion and a second wall portion parallel to each other in a cross-sectional shape, has a first opening on one end side of the first wall portion and the second wall portion, and is on the other end side. Has a second opening in
A first contact surface in which the first core contacts the first wall portion, a second contact surface in contact with the second wall portion, and a first contact surface provided at the tip end portion of the first core portion. It has a recess, and the first contact surface and the second contact surface are parallel to each other.
A third contact surface in which the second core contacts the first wall portion, a fourth contact surface in contact with the second wall portion, and a second contact surface provided at the tip end portion of the second core portion. It has a recess, and the third contact surface and the fourth contact surface are parallel to each other.
When the tip of the first core and the tip of the second core are butted against each other, a hole is formed by the first recess and the second recess, and the central axis of the hole is the first. It is perpendicular to one contact surface, the second contact surface, the third contact surface, and the fourth contact surface.
In the first step, the first contact surface of the first core is brought into contact with the first wall portion, and the second contact surface of the first core is brought into contact with the second wall portion. The tip of the first core is pushed between the first wall and the second wall through the first opening on one end side of the member.
In the first step, the third contact surface of the second core is brought into contact with the first wall portion, and the fourth contact surface of the second core is brought into contact with the second wall portion. The tip of the second core is pushed between the first wall and the second wall through the second opening on the other end side of the member.
In the second step, the first burring process is performed on the first wall portion by utilizing the hole formed by abutting the tip portion of the first core and the tip portion of the second core. A hole is provided, and a second burring hole is provided in the second wall portion, where the first burring hole has a rising portion extending toward the second wall portion, and the second burring hole is formed. It has a rising portion extending toward the first wall portion, and has a rising portion.
In the third step, the first core is pulled out from the inside of the burring processed material through the first opening, and the second core is pulled out of the burring processed material through the second opening. Pull out from the inside of the
Manufacturing method of burring processed lumber. Before inserting the first core and the second core into the member, the distance X1 between the first contact surface and the second contact surface is the distance X1 between the first wall portion and the second wall portion. The distance X2 between the third contact surface and the fourth contact surface is longer than the distance Y between the first wall portion and the second wall portion.
In the first step, by pushing the first core and the second core between the first wall portion and the second wall portion, the first wall portion and the second wall portion are brought into contact with each other. Increase the distance Y,
The manufacturing method according to claim 1. In the cross-sectional shape, it has a first wall portion and a second wall portion parallel to each other, has a first opening on one end side of the first wall portion and the second wall portion, and has a second opening on the other end side. A core for burring that is inserted between the first wall portion and the second wall portion when burring is performed on a member having a portion.
A first core inserted through the first opening and a second core inserted through the second opening are provided.
A first contact surface in which the first core contacts the first wall portion, a second contact surface in contact with the second wall portion, and a first recess provided at the tip end portion of the first core portion. The first contact surface and the second contact surface are parallel to each other.
A third contact surface in which the second core contacts the first wall portion, a fourth contact surface in contact with the second wall portion, and a second recess provided at the tip end portion of the second core portion. The third contact surface and the fourth contact surface are parallel to each other.
When the tip of the first core and the tip of the second core are butted against each other, a hole is formed by the first recess and the second recess, and the central axis of the hole is the first. It is perpendicular to one contact surface, the second contact surface, the third contact surface, and the fourth contact surface.
Core for burring. Before inserting the first core and the second core into the member, the distance X1 between the first contact surface and the second contact surface is the distance X1 between the first wall portion and the second wall portion. The distance X2 between the third contact surface and the fourth contact surface is longer than the distance Y between the first wall portion and the second wall portion.
The core according to claim 3. A burring processing apparatus comprising the core according to claim 3 or 4. The first cylinder connected to the first core and
The second cylinder connected to the second core and
With
The first cylinder is configured so that the first core can move in a direction parallel to the first contact surface and the second contact surface.
The second cylinder is configured to allow the second core to move in a direction parallel to the third contact surface and the fourth contact surface.
The device according to claim 5.

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