JP2014200807A - Manufacturing apparatus of fixing metal fittings - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for simply manufacturing fixing metal fittings with fixing parts formed at the end part of a rebar, the fixing metal fittings that can resist a large pull-out force and hard to be broken.SOLUTION: A manufacturing apparatus 2 has: a case 21 including a hollow part 212; crimping dies 22 plugged in a hollow part 212 of the case 21, and sandwiching a sleeve 12 from an outer circumferential surface; and a pressing cylinder 24 for pressing the crimping dies 22 in the hollow part 212 of the case 21, and pressing the end part of the sleeve 12. The crimping dies 22 sandwich the sleeve 12 from the outer circumferential surface, and crimps the inner circumferential surface of the sleeve 12 to the outer circumferential surface of a rebar 11 by pressing the sleeve 12 radially inward from the outer circumferential surface as being pushed in the hollow part 212 of the case 21. Also, the pressing cylinder 24 presses one end part of the sleeve 12 crimped to the rebar 11 in an axial direction, and thereby the diameter of one end part of the sleeve 12 is increased to the outside in the radial direction to form a fixing part 121.

Description

  The present invention relates to a manufacturing apparatus for manufacturing a fixing metal fitting in which a sleeve is pressure-bonded to a reinforcing bar.

Conventionally, fixing metal fittings are used to increase the adhesion between concrete and reinforcing bars when placing concrete.
The fixing bracket includes a fixing portion having a shape that expands at a right angle with respect to the pulling direction in order to resist pulling out the reinforcing bars embedded in the concrete.

  In Patent Literature 1, a reinforcing bar having a fixing metal fitting at an end thereof, a fixing member having an outer shape larger than an outer diameter of the end surface of the reinforcing bar is opposed to the end surface of the reinforcing bar, and at least an end surface region of the reinforcing bar There has been proposed one having a fixing metal fitting which is welded in an area corresponding to the above and integrated with each other.

JP 2010-174563 A

The reinforcing bar provided with the fixing metal fitting described in Patent Document 1 can increase the resistance to the pulling force by the fixing member welded to the end surface of the reinforcing bar.
However, the end face of the reinforcing bar and the fixing member are only joined by welding, and since the pulling force acts on the joining portion, the possibility of breaking at the portion is high.

  Therefore, the present invention is a fixing metal fitting in which a sleeve is crimped to a reinforcing bar and a fixing portion is formed on the end of the sleeve, which can resist a large pulling force and is difficult to break. An object of the present invention is to provide an apparatus for performing the above.

  In order to achieve the above object, a fixing bracket manufacturing apparatus according to an aspect of the present invention is formed of a reinforcing bar and a hollow sleeve having a substantially cylindrical shape and having an insertion hole through which the reinforcing bar is inserted. An apparatus for manufacturing a fixing bracket provided with a fixing portion on one end side and having the inner peripheral surface of the sleeve crimped to the outer peripheral surface of the reinforcing bar, the case including a hollow portion having at least one end opened And a pair of crimping dies that are inserted into the hollow portion of the case and sandwich the sleeve from the outer peripheral surface, and the pair of crimping dies are pushed into the hollow portion of the case and the end portion of the sleeve is pressed. The pair of crimping dies sandwiches a sleeve having one end of the rebar inserted into the insertion hole from the outer peripheral surface, and in the hollow portion of the case. As the gap is inserted, the gap provided between each other is formed narrower, so that the sleeve is pressed radially inward from the outer peripheral surface, and the inner peripheral surface of the sleeve is pressed against the outer peripheral surface of the reinforcing bar. The pressing cylinder is configured to press the one end of the sleeve crimped to the reinforcing bar in the axial direction, thereby expanding the one end of the sleeve radially outward to form the fixing unit. And

  Further, the pair of crimping dies may be provided with a notch portion that is notched in accordance with the shape of the sleeve at a position where the sleeve is sandwiched.

According to the present invention, since the pressing of the reinforcing bar and the sleeve and the formation of the fixing portion can be performed in a series of steps, the manufacturing can be performed easily and in a short time.
In addition, the fixing metal fitting manufactured by the manufacturing apparatus according to the present invention can withstand a large pulling force and is not easily broken because the reinforcing bar and the sleeve are firmly joined by pressure bonding.

5A is a perspective view and FIG. 5B is a cross-sectional view showing a fixing bracket manufactured by a fixing bracket manufacturing apparatus according to an embodiment of the present invention. It is a perspective view of the reinforcing bar which comprises the fixing metal fitting manufactured by the manufacturing apparatus of the fixing metal fitting concerning this embodiment. It is a perspective view of the sleeve which comprises the fixing metal fitting manufactured with the manufacturing apparatus of the fixing metal fitting concerning this embodiment. It is sectional drawing which showed the manufacturing process of the fixing metal fitting by the manufacturing apparatus of the fixing metal fitting concerning this embodiment. It is sectional drawing which showed the manufacturing process of the fixing metal fitting by the manufacturing apparatus of the fixing metal fitting concerning this embodiment. It is sectional drawing which showed the manufacturing process of the fixing metal fitting by the manufacturing apparatus of the fixing metal fitting concerning this embodiment. It is sectional drawing which showed the manufacturing process of the fixing metal fitting by the manufacturing apparatus of the fixing metal fitting concerning this embodiment. It is (a) perspective view and (b) sectional view showing other fixing metal fittings manufactured by the fixing metal fitting manufacturing method concerning this embodiment. It is sectional drawing which showed the manufacturing process of the other fixing bracket manufactured with the manufacturing apparatus of the fixing bracket which concerns on this embodiment. It is sectional drawing which showed the manufacturing process of the other fixing bracket manufactured with the manufacturing apparatus of the fixing bracket which concerns on this embodiment. It is sectional drawing which showed the manufacturing process of the other fixing bracket manufactured with the manufacturing apparatus of the fixing bracket which concerns on this embodiment. It is sectional drawing which showed the manufacturing process of the other fixing bracket manufactured with the manufacturing apparatus of the fixing bracket which concerns on this embodiment. It is sectional drawing which showed the other fixing metal fitting manufactured with the manufacturing apparatus of the fixing metal fitting concerning this embodiment.

Hereinafter, a fixing bracket manufacturing apparatus according to an embodiment of the present invention will be described with reference to the drawings.
First, FIG. 1 shows a fixing bracket 1 manufactured by a fixing bracket manufacturing apparatus according to this embodiment.
The fixing bracket 1 includes a reinforcing bar 11 and a sleeve 12 having an insertion hole 12a through which the reinforcing bar 11 is inserted. The inner peripheral surface of the sleeve 12 is pressure-bonded to the outer peripheral surface of one end of the reinforcing bar 1. .
In addition, a disk-shaped fixing portion 121 whose diameter is increased outward in the radial direction is formed at one end portion of the sleeve 12, and the fixing portion 121 improves the fixing force with respect to concrete or the like.
Further, a retaining portion 111 having a diameter expanded radially outward is formed at one end of the reinforcing bar 11. The retaining portion 111 is formed to have a diameter larger than the diameter of the insertion hole 12 a of the sleeve 12. When a pulling force is applied to the reinforcing bar 11, the retaining part 111 is caught by the edge of the insertion hole 12 a and the reinforcing bar 11 is pulled out from the sleeve 12. To prevent it.

  In this example, as shown in FIG. 2, the reinforcing bar 11 is a deformed reinforcing bar in which convex nodes parallel to each other are formed at a constant pitch on the outer peripheral surface. Here, in the fixing bracket 1 manufactured by the fixing bracket manufacturing apparatus according to this embodiment, the inner peripheral surface of the sleeve 12 is pressure-bonded onto the outer peripheral surface of the reinforcing bar 11. For this reason, if there is a convex node formed on the outer peripheral surface of the reinforcing bar 11, the convex node of the reinforcing bar 11 bites into the inner peripheral surface of the sleeve 12 at the time of crimping, and therefore resists a larger pulling force. Can do. However, even if the reinforcing bar is other than this type of reinforcing bar, it is possible to manufacture the fixing bracket 1 by pressing the reinforcing bar 11 against the sleeve 12 using the fixing bracket manufacturing apparatus according to the present embodiment.

As shown in FIG. 3, the sleeve 12 before the manufacturing process is applied by the fixing metal fitting manufacturing apparatus according to the present embodiment is a cylindrical shape having a certain diameter, particularly a cylindrical steel pipe in this example. The insertion hole 12a is open at both ends. The diameter of the insertion hole 12a is slightly larger than the diameter of the reinforcing bar 11, and the reinforcing bar 11 can be inserted through the opening at both ends.
The sleeve 12 may be manufactured in a cylindrical shape by a mold, or may be manufactured by cutting out from a steel bar, and the manufacturing method thereof is not particularly limited.
Further, in this example, the sleeve 12 has a lower hardness than the reinforcing bar 11, and when the reinforcing bar 11 is crimped to the inner peripheral surface of the insertion hole 12 a of the sleeve 12, the outer periphery of the reinforcing bar 11 is used. The node on the surface bites into the inner peripheral surface of the insertion hole 12 a of the sleeve 12.

Next, the fixing bracket manufacturing apparatus according to this embodiment will be described.
As shown in FIG. 4, the manufacturing apparatus 2 includes a case 21, a crimping die 22, a jig 23, and a pressing cylinder 24.

The case 21 is a cylindrical member having an opening 211 at least at one end. Inside the case 21, a hollow portion 212 is formed at the back of the opening 211, and a pair of crimping dies 22 can be inserted from the opening 211 into the hollow portion 212.
The section of the opening 211 and the section of the hollow section 212 in the insertion direction of the crimping die 22 are formed in a substantially rectangular shape in accordance with the outer peripheral surface shape of the entire pair of crimping dies 22. The rectangular cross section gradually becomes narrower from the opening 211 into which the crimping die 22 is inserted toward the back.
Note that the openings 211 of the case 21 may be provided at both ends.

The crimping dies 22 are used in pairs in this example. The sleeve 12 into which the reinforcing bar 11 is inserted is sandwiched between the pair of crimping dies 22, and the inner peripheral surface of the sleeve 12 is crimped to the outer peripheral surface of the reinforcing bar 11. It is a member for.
The crimping die 22 is pushed into the hollow portion 212 of the case 21 from the opening 211 by the pressing cylinder 24 when the fixing metal fitting 1 is manufactured. The entire outer peripheral shape of the pair of crimping dies 22 sandwiching the sleeve 12 through which the reinforcing bar 11 is inserted is in accordance with the sectional shape of the opening portion 211 of the case 21 and the crimping die 22 of the hollow portion 212 in the insertion direction. ing. That is, the cross section has a substantially rectangular shape, and is gradually narrowed in a direction to be inserted into the hollow portion 212.

  Further, the crimping die 22 is a surface where the pair of crimping dies 22 face each other, and the outer peripheral surface of the sleeve 12 is in contact with the outer peripheral surface of the sleeve 12 when the sleeve 12 into which the reinforcing bar 11 is inserted is sandwiched. A cut-out part 221 having a semicircular cross section corresponding to the shape is formed.

Since the notch portions 221 having a semicircular cross section are formed in each crimping die 22, when the pair of crimping dies 22 are stacked with the notch portions 221 facing each other, the sleeve 12 A gap having a substantially circular cross section corresponding to the outer peripheral shape is formed.
Here, the notch 221 is provided so that the diameter of the gap having a substantially circular cross section formed by the notch 221 facing each other is slightly smaller than the outer diameter of the sleeve 12. As a result, the sleeve 12 can be reduced in diameter by sandwiching the sleeve 12 between the notches 221 of the pair of crimping dies 22 and applying a pressing force radially inward from the entire outer peripheral surface of the sleeve 12. . At this time, since the reinforcing bar 11 is inserted into the insertion hole 12 a of the sleeve 12, the diameter of the reinforcing bar 11 is reduced, and the inner peripheral surface of the sleeve 12 is pressure-bonded to the outer peripheral surface of the reinforcing bar 11.

  Furthermore, the outer periphery of the disk-shaped fixing part 121 formed at one end part of the sleeve 12 on the side where the pair of crimping dies 22 face each other on one end part side having a wide cross section among the end parts of the crimping die 22. A notch 222 having a semicircular cross section conforming to the surface shape is formed.

Since each crimping die 22 is formed with a semicircular cutout 222, when the pair of crimping dies 22 are stacked with the notch 222 facing each other, the sleeve 12 is placed between the pair of crimping dies 22. A gap having a substantially circular cross section corresponding to the disk-shaped fixing portion 121 formed at one end is formed.
Here, the notch 222 has a substantially circular cross section formed by the cutouts 222 facing each other, and the diameter of the gap having a substantially circular cross section formed by the cutouts 221 of the pair of crimping dies 22 overlapped. The diameter is larger than the gap of the shape. As a result, when the sleeve 12 is sandwiched between the pair of crimping dies 22 and one end portion of the sleeve 12 is pressed in the axial direction by the pressing cylinder 24, the one end portion of the sleeve 12 is blocked by the crimping die 22. The diameter is increased radially outward.

  In this example, the crimping dies 22 are used in pairs, but three or more may be used as a pair as long as the sleeve 12 into which the reinforcing bar 11 is inserted can be sandwiched.

The jig 23 is a member that is sandwiched between the crimping die 22 and the pressing cylinder 24 when the sleeve 12 into which the reinforcing bar 11 is inserted is pushed into the hollow portion 212 of the case 21 with the pair of crimping dies 22.
The shape of the jig 23 is not particularly limited, but one end is in contact with the crimping die 22 and the other end is in contact with the pressing cylinder 24. Therefore, for example, the two jigs 23 prepared for each crimping die 22 may be sandwiched between the respective crimping dies 22 and the pressing cylinder 24, one end abuts both the pair of crimping dies 22, and the other One jig 23 whose end abuts on the pressing cylinder 24 may be sandwiched between the pair of crimping dies 22 and the pressing cylinder 24.
Moreover, the material of the jig 23 is not particularly limited, but may be made of a metallic material such as iron that can withstand the pressing force of the pressing cylinder 24.

The pressing cylinder 24 is a component of a pressing device that applies a pressing force to the object, and presses the object in accordance with the driving of the pressing device.
The pressing cylinder 24 pushes the pair of crimping dies 22 sandwiching the sleeve 12 through which the reinforcing bar 11 is inserted into the hollow portion 212 of the case 21, and therefore the end portions of the pair of crimping dies 22 through the jig 23. Apply pressure to Further, one end portion of the sleeve 12 through which the reinforcing bar 11 is inserted is pressed in the axial direction, and the one end portion of the sleeve 12 is expanded radially outward to form the disk-shaped fixing portion 121.
In this example, various pressing devices can be used as long as they can apply a pressing force to the crimping die 22 and the sleeve 12 including the pressing cylinder 24.

  In this example, the jig 23 is used. However, before the rebar 11 and the sleeve 12 are pressure-bonded, the jig 23 has a pressing cylinder 24 at one end of the sleeve 12 protruding from the end of the case 21 or the crimping die 22. Is used to prevent the pressing die 22 from coming into contact with the pressing die 22. Therefore, when the reinforcing bar 11 and the sleeve 12 are crimped, if the pressing force can be applied to the crimping die 22 without pressing one end of the sleeve 12, the pressing die 24 is directly pressed against the crimping die 22. Also good.

Next, a series of steps for manufacturing the fixing bracket by the fixing bracket manufacturing apparatus according to the present embodiment will be described.
First, as shown in FIG. 4, one end of the reinforcing bar 11 is inserted into the insertion hole 12 a of the sleeve 12. At this time, without inserting the rebar 11 over the entire length of the insertion hole 12a, the reinforcing bar 11 is not inserted into the insertion hole 12a by the length necessary to form the fixing portion 121 at one end of the sleeve 12, Leave it empty.

  In a state where one end of the reinforcing bar 11 is inserted into the insertion hole 12 a of the sleeve 12, the sleeve 12 is sandwiched between a pair of crimping dies 22. At this time, since the inner peripheral shape of the notch portion 221 conforms to the outer peripheral shape of the sleeve 12, the sleeve 12 can be firmly sandwiched between the pair of crimping dies 22.

  In addition, a disk-shaped fixing portion 121 whose diameter is increased radially outward is formed in one end portion of the sleeve 12 in a subsequent process. Therefore, when the sleeve 12 is sandwiched between the pair of crimping dies 22, Of the total length, the length necessary to form the fixing portion 121 is not sandwiched between the pair of crimping dies 22 but protrudes from the pair of crimping dies 22.

Then, the sleeve 12 that is sandwiched between the pair of crimping dies 22 and through which the reinforcing bars 11 are inserted is inserted into the hollow portion 212 of the case 21 from the opening 211 together with the crimping dies 22.
Then, when the jig 23 is sandwiched between the end face of each crimping die 22 and the pressing cylinder 24, the pressing cylinder 24 is controlled to apply the pressing force from the pressing cylinder 24 to the crimping die 22 via the jig 23. The rebar 11 and the sleeve 12 are pushed into the hollow portion 212 together with 22.

  Here, since the hollow portion 212 is formed narrower toward the back, the pair of crimping dies 22 that have received the pressing force from the pressing cylinder 24 via the jig 23, the inner peripheral surface of the hollow portion 212. As it is pushed into the interior of the hollow portion 212 while sliding, the drag from the inner peripheral surface of the hollow portion 212 acts on the pair of crimping dies 22 in the direction of narrowing the gap between the pair of crimping dies 24. To do.

  As a result, as shown in FIG. 5, the sleeve 12 sandwiched between the pair of crimping dies 22 only by the pressing force applied in the axial direction is radially inward from the entire outer peripheral surface by the pair of crimping dies 22. The inner peripheral surface of the sleeve 12 is pressure-bonded to the outer peripheral surface of the reinforcing bar 11. At this time, the reinforcing bar 11 is also reduced in diameter as a result of the pressing force being applied to the reinforcing bar 11 inward in the radial direction.

  When the sleeve 12 is crimped to the reinforcing bar 11, the jig 23 is removed and the pressing cylinder 24 is brought into contact with one end of the sleeve 12 as shown in FIG. 6. Then, a pressing force in the axial direction is applied to the sleeve 12 by the pressing cylinder 24. At this time, since the inner peripheral surface of the sleeve 12 is pressure-bonded to the outer peripheral surface of the reinforcing bar 11 and the reinforcing bar 11 and the sleeve 12 are fixed to each other, one end of the sleeve 12 is pressed by the pressing cylinder 24. However, the reinforcing bar 11 does not slide in the insertion hole 12 a of the sleeve 12 and the reinforcing bar 11 is not further inserted into the insertion hole 12 a of the sleeve 12.

When a pressing force in the axial direction is continuously applied to the sleeve 12, the end portion of the sleeve 12 is buckled and expanded in the radial direction.
As shown in FIG. 7, the diameter-expanded portion has a disk shape that is double-folded at the center portion, and constitutes the fixing unit 121.

  On the other hand, when the length of the portion of the sleeve 12 becomes shorter as the end portion of the sleeve 12 expands radially outward, the end portion of the reinforcing bar 11 in the insertion hole 12a in the portion becomes the pressing cylinder. 24 abuts. If a pressing force is continuously applied by the pressing cylinder 24 in this state, the end of the reinforcing bar 11 gradually expands radially outward. As a result, a retaining portion 111 having a diameter larger than the diameter of the insertion hole 12a of the reduced diameter sleeve 12 is formed at the end of the pressed reinforcing bar 11.

As described above, by only applying a pressing force in the axial direction by the pressing cylinder 24, a force acting on the sleeve 12 and the reinforcing bar 11 inserted in the sleeve 12 in the axial direction and in the radial direction is applied. As a result, the fixing portion 121 and the retaining portion 111 can be formed at a time. As described above, the fixing metal fitting manufacturing apparatus according to the present embodiment independently realizes the production of products for different uses such as a reinforcing bar joint and a fixing anchor by using a technique called pressure bonding.
According to the fixing metal fitting 1, since the fixing portion 121 having a diameter increased in the outer side in the radial direction, that is, in the direction perpendicular to the axial direction, is formed at the end of the sleeve 12, adhesion to the concrete or the like. Can withstand high pull-out force.
Further, a retaining portion 111 whose diameter is increased radially outward, that is, in a direction perpendicular to the axial direction, is also formed at the end portion of the reinforcing bar 11, and this retaining portion 111 is formed from the diameter of the insertion hole 12 a of the sleeve 12. Since the diameter of the reinforcing bar 11 is also large, the rebar 11 is difficult to be removed from the sleeve 12 and can resist a large pulling force.

  In the above embodiment, the fixing bracket 1 is manufactured from the cylindrical sleeve 12 having both ends opened. However, the fixing bracket 3 is manufactured from a substantially cylindrical sleeve having one end opened and the other end closed. You can also.

As shown in FIG. 8, the fixing metal fitting 3 is composed of a reinforcing bar 31 and a sleeve 32 having an insertion hole 32 a through which the reinforcing bar 31 is inserted. The peripheral surface is crimped.
In addition, a disk-shaped fixing portion 321 whose diameter is increased outward in the radial direction is formed at one end of the sleeve 32, and the fixing portion 321 improves the fixing force for concrete or the like.

  In this example, the reinforcing bar 31 is also a deformed reinforcing bar in which convex nodes parallel to each other are formed on the outer peripheral surface at a constant pitch. The fixing bracket 3 can be manufactured by pressing the reinforcing bar 31 to the sleeve 32 by the fixing bracket manufacturing method according to the embodiment.

  The sleeve 32 before the fixing metal fitting manufacturing method according to the present embodiment is applied is a cylindrical steel pipe having a certain diameter, one end is open, the other is closed, and the inside is an insertion hole. 32a is constituted. The diameter of the insertion hole 32a is slightly larger than the diameter of the reinforcing bar 31, and the reinforcing bar 31 can be inserted from the opening on one end side.

Next, a series of steps for manufacturing the fixing bracket 3 by the fixing bracket manufacturing apparatus according to the present embodiment will be described.
First, as shown in FIG. 9, one end of the reinforcing bar 31 is inserted into the insertion hole 32 a of the sleeve 32 from one end opening. At this time, without inserting the reinforcing bar 31 over the entire length of the insertion hole 32a, the reinforcing bar 31 is inserted into the insertion hole 32a by the length necessary to form the fixing portion 121 at the end of the sleeve 32 on the closed side. Is not inserted and is left empty.

  The sleeve 32 is sandwiched between the pair of crimping dies 22 in a state where one end of the reinforcing bar 31 is inserted into the insertion hole 32 a of the sleeve 32. At this time, since the inner peripheral shape of the notch portion 221 conforms to the outer peripheral shape of the sleeve 32, the sleeve 12 can be firmly sandwiched between the pair of crimping dies 22.

  In addition, since a disk-shaped fixing portion 321 having a diameter increased radially outward is formed in one end portion of the sleeve 32 in a subsequent process, when the sleeve 32 is sandwiched between the pair of crimping dies 22, Of the total length, the length necessary to form the fixing portion 321 is not sandwiched between the pair of crimping dies 22 but protrudes from the pair of crimping dies 22.

Then, the sleeve 32 sandwiched between the pair of crimping dies 22 and having the reinforcing bar 31 inserted is inserted into the hollow portion 212 of the case 21 from the opening 211 together with the crimping dies 22.
Then, when the jig 23 is sandwiched between the end face of each crimping die 22 and the pressing cylinder 24, the pressing cylinder 24 is controlled to apply the pressing force from the pressing cylinder 24 to the crimping die 22 via the jig 23. The reinforcing bar 31 and the sleeve 32 are pushed into the hollow portion 212 together with 22.

  Here, since the hollow portion 212 is formed narrower toward the back, the pair of crimping dies 22 that have received the pressing force from the pressing cylinder 24 via the jig 23, the inner peripheral surface of the hollow portion 212. As it is pushed into the hollow portion 212 while sliding, the drag from the inner peripheral surface of the hollow portion 212 acts on the pair of crimping dies 22 in the direction of narrowing the gap between the pair of crimping dies 22. To do.

  As a result, as shown in FIG. 10, the sleeve 32 sandwiched between the pair of crimping dies 22 is pressed radially inward from the entire outer peripheral surface by the pair of crimping dies 22 only by an axial external force. The diameter is reduced, and the inner peripheral surface of the sleeve 32 is crimped to the outer peripheral surface of the reinforcing bar 31. At this time, the reinforcing bar 31 is also reduced in diameter as a result of applying a pressing force to the reinforcing bar 31 inward in the radial direction.

  When the sleeve 32 is pressure-bonded to the reinforcing bar 31, the jig 23 is removed and the pressing cylinder 24 is brought into contact with one end of the sleeve 32 as shown in FIG. Then, a pressing force in the axial direction is applied to the sleeve 32 by the pressing cylinder 24. At this time, since the inner peripheral surface of the sleeve 32 is pressure-bonded to the outer peripheral surface of the reinforcing bar 31 and the reinforcing bar 31 and the sleeve 32 are fixed to each other, one end of the sleeve 32 is pressed by the pressing cylinder 24. However, the reinforcing bar 31 does not slide in the insertion hole 32 a of the sleeve 32 and the reinforcing bar 31 is not further inserted into the insertion hole 32 a of the sleeve 32.

When a pressing force in the axial direction is continuously applied to the sleeve 32, the end portion of the sleeve 32 is buckled and is expanded in the radial direction.
As shown in FIG. 12, the diameter-expanded portion has a disk shape that is double-folded at the center portion, and forms a fixing unit 321.

  On the other hand, when the length of the portion of the sleeve 32 becomes shorter as the end portion of the sleeve 32 expands radially outward, the end portion of the reinforcing bar 31 in the insertion hole 32a in the portion becomes the sleeve 32. Abuts against the end of

As described above, by only applying a pressing force in the axial direction by the pressing cylinder 24, a force acting in the axial direction and radially inward is applied to the sleeve 32 and the reinforcing bar 31 inserted into the sleeve 32. As a result, the fixing bracket 3 in which the fixing portion 321 is formed is manufactured.
According to the fixing bracket 3, since the fixing portion 321 whose diameter is increased radially outward, that is, in a direction perpendicular to the axial direction, is formed at the end portion of the sleeve 32, adhesion to concrete or the like is achieved. Can withstand high pull-out force.

In the manufacture of the fixing bracket 1 described above, after the fixing portion 121 having an enlarged diameter is formed, the end portion of the reinforcing bar 11 is further pressed to form the retaining portion 111, but without the retaining portion 111 being formed, As shown in FIG. 13, it is possible to manufacture the fixing bracket 4 in which the fixing portion 421 and the end of the reinforcing bar 41 are formed flush with each other.
That is, the length of the reinforcing bar 41 inserted into the insertion hole 42a of the sleeve 42 is adjusted, and the manufacturing unit 2 presses the end of the sleeve 42 to reduce the diameter, thereby forming the fixing unit 421. At that time, the pressing is stopped when the end portions of the fixing portion 421 and the reinforcing bar 41 are flush with each other. As a result, the fixing bracket 4 in which the end portion of the reinforcing bar 41 and the fixing portion 421 are flush with each other can be manufactured.

DESCRIPTION OF SYMBOLS 1 Fixing metal fitting 11 Reinforcing bar 111 Detachment part 12 Sleeve 12a Insertion hole 121 Fixing part 2 Manufacturing apparatus 21 Case 211 Opening part 212 Hollow part 22 Crimping die 221 Notch part 222 Notch part 23 Jig 24 Pressing cylinder 3 Fixing metal part 31 Reinforcing bar 32 Sleeve 32a 32 Hole 321 Fixing portion 4 Fixing bracket 41 Reinforcing bar 42 Sleeve 42a Insertion hole 421 Fixing portion

Claims (2)

Rebar,
A hollow sleeve having a substantially cylindrical shape and having an insertion hole through which the reinforcing bar is inserted,
An apparatus for manufacturing a fixing bracket provided with a fixing portion on one end side and having the inner peripheral surface of the sleeve crimped to the outer peripheral surface of the reinforcing bar,
A case provided with a hollow portion having at least one end opened;
A pair of crimping dies inserted into the hollow portion of the case and sandwiching the sleeve from the outer peripheral surface;
A pressing cylinder for pressing the pair of crimping dies into the hollow portion of the case and pressing the end of the sleeve;
The pair of crimping dies sandwiches a sleeve in which one end of the reinforcing bar is inserted into the insertion hole from the outer peripheral surface, and the gap provided between the pair of crimping dies narrows as the sleeve is pushed into the hollow portion of the case. By being formed, the sleeve is pressed radially inward from the outer peripheral surface, and the inner peripheral surface of the sleeve is crimped to the outer peripheral surface of the reinforcing bar,
The pressing cylinder presses one end portion of the sleeve pressed against the reinforcing bar in the axial direction, thereby expanding one end portion of the sleeve radially outward to form the fixing portion.
An apparatus for manufacturing a fixing bracket. The pair of crimping dies are provided with a notch portion that is notched in accordance with the shape of the sleeve at a position where the sleeve is sandwiched.
The apparatus for manufacturing a fixing metal fitting according to claim 1.

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