JP2773954B2 - Wire bending machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to, for example, bending a bend streak or bending a reinforcing wire mesh embedded in a precast concrete product or the like along the product shape. The present invention relates to a wire bending machine mainly used for bending.

[Conventional technology]

Conventionally known as the above-mentioned wire bending machine is a wire bending machine in which a middle portion of a wire such as a reinforcing bar holding one end is brought into contact with a fixing member and the other end of the wire is surrounded by the fixing member. There is a configuration in which the wire is bent with the fixed member as a fulcrum by pressing a rotatable movable member and driving and rotating the movable member (the literature cannot be cited).

[Problems to be solved by the invention]

However, the conventional wire bending machine described above has the following problems.

In other words, the wire is bent by rotating the movable member pressed against the wire at a position distant from the fulcrum around the fixed member, with the fixed member brought into contact with the intermediate portion as a fulcrum. Due to the contact position between the fixed member and the movable member with respect to the wire rod being separated,
The wire rod after the bending process is bent at the bent portion, and it is difficult to perform the square bending process. Therefore, when a wire mesh for reinforcement of a precast concrete member that requires fine bending is used as a wire to be bent, the bent part is not square but curved and the whole becomes swollen. In order to cover the wire mesh with a sufficient covering, the concrete portion must be thickened, which leads to an increase in the weight of the product.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wire bending machine that can easily perform cornering of a bent portion in view of the above-described circumstances.

[Means for solving the problem]

The feature of the wire bending machine according to the present invention is that a holding portion for holding one end of a wire to be bent and a bending support portion having a shape to be bent are provided, and the bending portion having one end held by the holding portion is provided. A bending section is pressed against the bending supporting section by pressing the bending target wire against the bending supporting section, and the pressing section is movably mounted in the perspective direction with respect to the bending supporting section, and the pressing section is moved along the moving direction. A driving mechanism for driving and moving is provided, and a moving direction of the pressing portion is set to a direction deviated by an angle smaller than a planned bending angle toward a bending side from a reference direction in which the mounting surface of the holding target of the bending target wire is oriented. It is in that. In addition, it is preferable that the deviation angle of the moving direction of the pressing portion from the reference direction is approximately one half of the expected bending angle.

(Operation)

According to the wire bending machine of the present invention, the wire is bent by driving and moving the pressing portion having the shape to be bent and pressing the wire against the bending support portion having the shape to be bent. In the vicinity, the wire can be surely made to conform to the shape to be bent.

In addition, the moving direction of the pressing portion with respect to the bending support portion for that purpose is set at a bending angle from the reference direction in which the mounting surface of the holding portion holding one end of the bending target wire faces the mounting surface of the bending target wire to the bending side. Is also set in a direction deviated by a small angle, so that the bending operation can be performed smoothly and with less damage to the wire to be bent. In other words, considering the case where the moving direction is matched with the reference direction, the pressing portion moves from a direction perpendicular to the straight wire before bending, and therefore, the pressing portion having the shape to be bent first. At the bent side thereof comes into contact with the wire and pushes the wire along the moving direction.
Along with that, the wire is bent, but this bending is performed with the vertex of the bending support portion, that is, the bending point as a fulcrum, so the portion of the wire that the bending side end of the pressing portion abuts, It moves on an arc centered on the bending point. However, since the moving direction of the pressing portion is a direction orthogonal to the wire before bending, the final position of the bending side end of the pressing portion at the time of completion of the bending is the pressing portion at the start of bending. The wire portion with which the bent side end of the wire abuts is separated from the portion located when the bending is completed. Therefore, along with the bending operation, the bending-side end of the pressing portion slides on the peripheral surface of the wire rod far from the bending point from the first contact point to the final position. It moves. Therefore, along with the sliding, the peripheral surface of the wire is likely to have scratches or damage, and due to the sliding contact resistance accompanying the sliding, it is difficult for the wire to be bent smoothly. There is a possibility that it may become. On the other hand, when the moving direction of the pressing portion is a direction deviated from the reference direction by a predetermined bending angle, that is, even when the pressing portion is moved along a direction perpendicular to the wire of the bent portion, There is a gap between the bent position of the portion where the bent side end of the pressing portion first contacts and the final position of the bent side end of the pressing portion, and the bent side end of the pressing portion is folded. Since the sliding of the wire periphery toward the curved point occurs, the same problem as in the previous case may occur. In comparison, in the wire bending machine of the present invention, since the moving direction of the pressing portion is the direction between the two directions described above, the sliding amount of the pressing portion with respect to the peripheral portion of the wire can be reduced, This reduces the occurrence of flaws and damages on the peripheral portion of the wire rod, and allows the bending operation to be performed smoothly by reducing the sliding resistance.

Therefore, in that sense, particularly when the deviation angle of the moving direction of the pressing portion from the reference direction is set to approximately one half of the expected bending angle, as described in claim 2, The sliding amount of the pressing portion against the peripheral portion of the wire can be minimized.

〔The invention's effect〕

Therefore, according to the wire bending machine of the present invention, since the wire can be surely made to conform to the shape to be bent, the bending portion can be easily bent at a sharp corner, and The work can be performed smoothly with little damage to the peripheral portion of the wire. As a result, even when the shape to be bent is intricately complicated, since the whole can be easily compacted without swelling due to easy squaring, for example, it is embedded in a precast concrete product such as a U-shaped groove. When the wire mesh as a reinforcing member to be bent is a wire to be bent,
Even if a sufficient covering thickness of concrete is ensured, it is possible to avoid that the thickness becomes too large, and it is possible to reduce the weight of the product.

〔Example〕

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

As shown in FIGS. 2 and 3, a holding part (3) for holding a wire mesh (S) as a wire material from above and below and holding the same on the body frame (1), and this holding part (3). A step bent portion (4) for bending a portion of one end side of the wire mesh (S) held in the step at two steps with a step, and the wire mesh (S) held in the holding portion (3) And an optional bent portion (5) for bending a portion opposite to a portion bent at the stepped bent portion (4) at an arbitrary angle, thereby providing a mesh as an example of a wire rod bending machine. The music machine is composed.

The holding portion (3) includes a receiving member (6) installed on both sides of the body frame (1), and a pressing member (7) for holding the wire mesh (S) between the receiving member (6). When,
A pair of left and right air cylinders (8a) for vertically moving the pressing member (7) along a vertical frame (8) erected on the left and right of the body frame (1) is provided. Then, at the time of the bending operation, first, the pressing member (7) is moved upward to insert the wire mesh (S) into the gap formed between the pressing member (7) and the receiving member (6), and then the pressing member (7) is moved downward. And the wire mesh (S) is pressed against the receiving material (6) to hold the wire mesh (S).

The stepped bent portion (4) is entirely composed of side frames (1A) made of left and right C-shaped members of the body frame (1),
It is mounted on a trolley (9) slidably mounted on the inside of (1B) via four rollers (9a) of front, rear, left and right. This cart (9) is moved via a screw feed mechanism (10).
First operation handle (11) fixed to the body frame (1)
When the first operation handle (11) is rotated, the shaft is moved along the side frames (1A) and (1B) to rotate the first operation handle (11). It is configured such that the separation distance of the part (4) from the holding part (3) can be changed.

The stepped bent portion (4) is provided between a cradle (12) fixed to the carriage (9) and a guide frame (13) erected on the carriage (9). A press die (14) having the same shape as that to be bent is formed by moving along the wire mesh (S) against the pedestal (12) to bend the wire mesh (S).

Both sides of a pressing frame (15) holding the pressing die (14) are fitted into guide grooves (not shown) formed inside the guide frame (13), and the pressing die (14) is It is configured to be able to move along the guide groove in the direction toward and away from the receiving table (12). In addition, the cart (9)
A pair of left and right air cylinders (16) is interposed between the and the pressing frame (15) as a drive mechanism for driving and moving the pressing die (14) in the moving direction.

As shown in FIG. 1, the receiving pedestal (12) and the stamping die (14) correspond to the two positions where the pedestal (4) is bent at the stepped bent portion (4) with a step, respectively. 12)
Denotes a pair of supporting portions (for convenience, a portion near the holding portion (3) is referred to as a first supporting portion (12A), and a portion far from the holding portion (3B) is referred to as a second supporting portion (12B)). Oshibe (also,
The one near the holding part (3) is referred to as a first pressing part (14A) and the one far from the holding part (3) is referred to as a second pressing part (14B)), and the first supporting part (12A) and the first pressing part ( 14A) and the first bent portion (4A), and the second support portion (12B) and the second push portion (1A).
4B) together form a second bent portion (4B). And the said receiving stand (12) and the press die (14) serve as the bending support part and the press part in this invention, respectively.

The second support portion (12B) is configured as a movable plate movable along an inclined surface formed by the first support portion (12A), and the second support portion (12B) is connected to a screw feed mechanism. (17)
And a second operation handle (18) for moving in the movement direction via the control lever. That is, the distance between the first support portion (12A) and the second support portion (12B) can be changed and set.

Further, the first pressing part (14A) is fixed to the pressing frame (15), and the second pressing part (14B) is rotated by the third operation handle (19) to rotate the screw feed mechanism (2).
0) via the first pressing portion (14A). That is, the first pusher (14A)
It is configured such that the interval between the second pressing portion (14B) and the second pressing portion (14B) can be changed.

Then, by changing the interval between the two support portions (12A) and (12B) and the interval between the two push portions (14A) and (14B) together, the first push portion (4A) is made.
The distance between the wire mesh (S) and the second pushing part (4B) is changed, and the wire mesh (S) is bent at two places with a step at the step bending part (4). It is configured so that the length can be changed.

The bending operation of the wire mesh (S) at two places where a step is formed by the step bending part (4) will be described with reference to FIGS. 1 to 3. First, the holding part described above will be described. The receiving member (6) of (3) and the first support portion (12) of the receiving stand (12)
A) and a wire mesh (S) are placed.
At this time, the positioning tool (21) mounted on the trolley (9) on which the stepped bent portion (4) is mounted abuts on a streak at an end portion of the wire mesh (S) and the wire mesh (S). ) Can be positioned. The positioning tool (21) is attached to the bogie (9) so as to be capable of changing its fixed position, and by changing the distance from the stepped bent part (4), the position of the part that is bent stepwise is changed. It is configured to be able to. During the bending operation, the positioning tool (21) is automatically moved from the step bending part (4) by the operation of the cylinder (22) in order to avoid a collision with a part attached to the pressing die (14). It is configured to move away.

Next, one end of the wire mesh (S) is held by moving the pressing material (7) of the holding part (3) toward the receiving material (6) and pressing the wire mesh (S) against the receiving material (6). (3). From this state, the step bent part (4)
The left and right air cylinders (16) are actuated to move the pressing die (14) toward the pedestal (12). With this movement,
First, a second pressing portion (14B), which is a bending-side end portion of the pressing portion having a shape to be bent, comes into contact with the wire mesh (S), and the wire mesh (S) serves as a bending support portion in a subsequent movement. It can be pressed against the cradle (12) and folded in two steps.

Then, as described above, the wire mesh (S), which is a wire material, is bent by pressing the wire mesh (S) against the pedestal (12) having the shape to be bent by the pressing die (14) also having the shape to be bent. In this way, the wire mesh (S) can be made to conform to the expected bending shape on both sides of the bending portion and very close to the bending portion, so that the bending portion can be squared. It is composed.

In addition, the bending at the first bending part (4A) and the bending at the second bending part (4B) can be performed at one time by one bending operation. The bending process of the wire rod (S) is performed with a small number of man-hours.

By the way, the moving direction (X) of the pressing die (14), which is the above-mentioned pressing part, is set in the reference direction (Y) in which the mounting surface of the receiving material (6), which is the wire mesh mounting part of the holding part (3), faces. The angle is set to a direction deviated by approximately one half of the expected bending angle (θ) toward the bending side. Next, the meaning will be described.

When the moving direction is matched with the reference direction (Y), as shown in FIG. 5A, the bending point (i) on the upper side of the pressing die (14) is First, the bending point (j) on the lower side of the pressing die (14) comes into contact with the wire mesh (S) at the point (a), and the pressing die (14) moves as the pressing die (14) moves. Then, the portion (a) of the wire mesh (S) is pressed downward, and moves toward the point (b). However, since the bent portion of the wire mesh (S) bends with the upper bending point (m) of the pedestal (12) as a fulcrum, the lower bending point (j) of the pressing die (14) is in contact with the wire. The portion (a) of the mesh (S) draws an arc around the fulcrum (m) and moves to the point (c) in the drawing when the bending is completed, so that a locus different from the moving direction of the pressing die (14) is formed. Draw. Therefore, with the movement of the die (14), the die (1
4) The lower bending point (j) slides away from the fulcrum (m) while abutting on the periphery of the wire mesh (S), and reaches the point (c) when the bending is completed. That is, sliding contact between the stamping die (14) and the wire mesh (S) occurs from the point (c) to the point (b). Therefore, there is a possibility that the wire mesh (S) may be flawed or may not be smoothly bent due to sliding contact resistance.

However, in the wire bending machine of this embodiment, FIG.
As shown by, the moving direction (X) of the pressing die (14) is set to a direction deviated from the reference direction (Y) to the bending side by approximately one half of the expected bending angle (θ). When the same reference numerals as those in FIG. 5 (a) are given to the points of the cradle (12), the stamping die (14) and the wire mesh (S), the lower bending point (j) of the stamping die (14) is first The point (c) where the point (a) of the abutting wire mesh (S) is located after bending coincides with the point (b) where the lower bending point (j) of the pressing die (14) is located after bending. Since the pressing die (14) and the wire mesh (S) move along almost the same trajectory, there is almost no sliding contact between them, and there is little risk of damage to the wire mesh (S) and resistance to bending work is prevented. It can be performed less smoothly.

When the direction of movement of the pressing die (14) is set to a direction deviated from the reference direction (Y) by a predetermined bending angle (θ), that is, two bending points (m) and (n) of the receiving table (12). ) Is not shown in the figure when it is moved along a direction perpendicular to the inclined surface connecting the dies, but the die (14) is moved along the reference direction.
Is caused to slide in the direction opposite to the direction in which the wire mesh (S) is moved, and a similar problem may occur.

In this embodiment, the pedestal (12) is provided with the second support portion (12).
B) is provided and the second pressing portion (14B) is provided on the pressing die (14) so that the bending at two places can be performed simultaneously by one operation.
The same operation and effect can be obtained even if the support portion (12B) and the second push portion (14B) are omitted. Further, the embodiment in which the moving direction (X) of the pressing die (14) is deviated from the reference direction (Y) by approximately one-half of the expected bending angle (θ) has been described, but the usefulness of the present invention is in this case. The movement direction (X) is not limited to the reference direction (Y)
Is arbitrary as long as the angle is smaller than the expected bending angle.

Next, returning to FIG. 3, the arbitrary bent portion (5) will be described. As described above, the arbitrary bent portion (5) is formed by the wire mesh (5) held by the holding portion (3). S),
For bending a part opposite to a part bent at the stepped bent part (4) at an arbitrary angle,
As shown in FIG. 1, the left-right direction of the axis (P ₁₎ and rotatable with said operating arm attached to the body frame (1) (23a) around, turning operation of the operating arm (23a) And a pair of left and right air cylinders (24).

Each of the air cylinders (24) is configured as a double rod cylinder, which pivotally supports a cylinder body (24A) to the body frame (1) and also has one piston rod (hereinafter, referred to as a first rod). The tip of (24a) is pivotally attached to one end of a support (23) on which the operation arm (23a) is mounted. Then, by the extension of the first rod (24a) by the operation of the air cylinder (24), the support base (23) is rotated around its rotation axis (P ₁ ) to move the operation arm (23a). By contacting the wire mesh (S) from below and extending the first rod (24a), the operation arm (23a) is rotated at an angle corresponding to the amount of extension, and the wire mesh (S) is The pressing member (7) of the holding part (3) for holding it is configured to be able to be bent with the fulcrum as a supporting point. That is, the operation arm (23
The support (23) provided with (a) constitutes a bending operation member (B) of the arbitrary bending portion (5).

When the wire mesh (S) is bent by the arbitrary bending portion (5), the bent wire mesh (S) tends to return to the original posture side by springback. Up to a great angle,
The wire arm (S) is largely bent by rotating the operation arm (23a), and the bent portion of the wire mesh (S) has a predetermined bending angle in a state where the bending operation is released. I have.

The second rod (24b) of the air cylinder (24) is connected to the first rod (24a) in the cylinder body (24A) and moves integrally. Then, the cylinder body (24) of the second rod (24b) is attached to the second rod (24b).
A stopper (25) is provided for limiting the amount of protrusion of the first rod (24a) by contacting the end of the cylinder body (24A) when retreating to A).

The stopper (25) is configured as a male screw member screwed into a male screw portion formed on the second rod (24b), and the stopper (25) is moved in the longitudinal direction of the second rod (24b). By changing the position by screwing back and forth along
The maximum protruding amount of the rod (24a) is changed to change the maximum bending angle of the arbitrary bending portion (5). That is, as a means for changing and setting the bending angle in this type of bending machine, there are other means for changing the operation amount of the air cylinder (24) by controlling the air supply amount, and mounting the air cylinder (24). Means for changing the position can be considered, but in the former case, the structure for control may be complicated, and in the latter case, not only is it difficult to make subtle changes and adjustments, but also the operation of the air cylinder (24) Since the amount is always the same, wasteful operation increases especially when the bending angle is small, and there is a problem that the operation takes time. In contrast, in the case of using the means for limiting the amount of protrusion of the first rod (24a) by the above-described stopper (25), control of the air cylinder (24) is complicated because control is performed by physical means. And the stopper (2
5) is attached and positioned by screwing to the second rod (24b), so that the stopper (25)
Fine adjustment of the amount of protrusion of the first rod (24a) can be performed extremely easily by screwing forward and backward. Furthermore, since the mounting position of the air cylinder (24) is fixed and the bending angle becomes smaller, the maximum protrusion amount of the first rod (24a) becomes smaller, so that work can be performed efficiently without useless operation. is there.

On the other hand, as shown in FIGS. 1 to 4, the stopper (25) is rotated to rotate the second rod (24b).
A rotary operation tool (26) for screwing along is fixed. The rotary operation tool (26) is configured as a toothed belt wheel, and a timing belt (27) is laid across the rotary operation tools (26) provided on the left and right air cylinders (24). The position of each stopper (25) with respect to the air cylinder (24) can be changed synchronously.

A third operating handle (28) for changing the position of the stoppers (25) and a transmission mechanism (24) for transmitting the rotation of the third operating handle (28) to the timing belt (27). 29) are fixed to the body frame (1).

The interlocking structure between the transmission mechanism (29) and the timing belt (27) will be described. The teeth of the timing belt (27) are formed on both front and back surfaces, and the transmission mechanism (29)
A transmission member (30) at the end of the transmission belt (27) for the timing belt (27) is configured as a toothed belt wheel that meshes with teeth outside the timing belt (27). The timing belt (27) is disposed at a position where the rod (24a) is engaged with the timing belt (27) from the outside of the loop formed by the retracted state. In addition, the transmission member (30) can be transmitted to the rotary operation tool (26) regardless of the position of the stopper (25) in the position changeable range with respect to the second rod (24b). In order to achieve this, the length is slightly larger than the length of the position changeable range.

That is, in consideration of the above-described operation state of the air cylinder (24), the support base (23) pivotally attached to the distal end of the first rod (24a) is moved along with the linear movement of the first rod (24a). P ₁ ) Because the first rod (24a) is pivoted around, as shown in FIG. 1, the pivot point (x) of the first rod (24a) with respect to the support table (23) is moved. Moves along the trajectory indicated by the dotted line (L ₁ ) in the figure. Accordingly, with the retraction of the first rod (24a), the attitude of the air cylinder (24) changes around the pivot point (P ₂ ) of the cylinder body (24A), and the rotation operation tool (26) also It moves along the trajectory indicated by the two-dot chain line (L ₂ ).

However, the transmission of the rotation from the third operating handle (28) to the rotary operating tool (26) is performed by the first rod (24).
a) for changing and setting the maximum protrusion amount,
Since it is not necessary to perform transmission during the operation of the air cylinder (24), the attitude of the air cylinder (24) changes greatly with respect to the body frame (1) with the operation, and While the operation handle (28) and the transmission mechanism (29) are fixed to the body frame (1), with the first rod (24a) of the air cylinder (24) most retracted, the second rod (24) The transmission mechanism (29) is interlocked with the rotary operation tool (26) for changing the position of the stopper (25) screwed into the stopper 24b), so that the bending angle of the arbitrary bending portion (5) can be adjusted. It is configured so that the change setting can be performed without any trouble.

Lastly, a description will be given of the entire bending process of the wire mesh (S) by this mesh bending machine.
After placing the wire mesh (S), the pressing member (7) of the holding section (3) is lowered to hold the wire mesh (S),
Next, the pressing die (14) of the stepped bent part (4) is lowered to bend at two places with a step, and further, an optional bent part (5)
The bending operation member (B) is swung to bend at an arbitrary angle. Thereafter, the bending operation member (B) is returned to the original posture, the pressing die (14) of the stepped bending part (4) is raised, and the pressing material (7) of the holding part (3) is raised. A bent wire mesh (S) is obtained. This wire mesh (S)
Is a reinforcing material which is embedded in a precast U-shaped groove concrete member.

(Another embodiment)

Next, other embodiments of the present invention not mentioned in the above embodiments will be listed.

<1> The mechanism for changing the distance between the first bent portion (4A) and the second bent portion (4B) may be omitted, and both bent portions (4A) and (4B) may be provided in a fixed state. .

<2> The moving direction (X) of the pressing die (14) can be arbitrarily changed and fixed freely within a range between the reference direction (Y) and a direction deviated from the reference bending angle (θ), For example, the moving direction (X) of the pressing die (14) is changed according to the diameter of the wire to be bent (S), the planned bending angle, and the like, so that finer bending processing can be controlled. Is also good.

<3> Shape of bending support part (12) and pressing part (14)
The specific configuration such as dimensions can be arbitrarily changed, and for example, those not having a surface along the expected bending shape on the holding portion (3) side from the bending point of the pressing portion (14). It may be.

<4> The driving / moving configuration of the pressing portion (14) in the perspective direction with respect to the bending support portion (12) can be changed as appropriate. For example, instead of the configuration using the air cylinder (16), the configuration using an electric motor or the like Is also good.

<5> In the above embodiment, as the wire to be bent (S), a wire mesh in which small-diameter round steel bars are assembled vertically and horizontally has been described as an example. One or a plurality of round steel bars or different diameter steel bars or various metal wires may be used as the wire to be bent (S).

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the structure shown in the attached drawings.

[Brief description of the drawings]

The drawings show an embodiment of the wire bending machine according to the present invention. FIG. 1 is a sectional view of a main part, FIG. 2 is a partially cutaway front view, FIG. 3 is an overall side view, and FIG. 5 (a) and (b) are explanatory views of the bending operation. (3) ... holding part, (12) ... bending support part, (14) pressing part, (16) ... drive mechanism, (S) ... wire to be bent,
(X): Moving direction, (Y): Reference direction, (θ):
The bending angle.

Claims (2)

(57) [Claims] A holding portion (3) for holding one end of a wire to be bent (S) and a bending support portion (12) having a shape to be bent are provided, and one end of the holding portion (3) is provided. The bending target wire (S), which has been held, is pressed against the bending support portion (12) to be bent. And a driving mechanism (16) for driving and moving the pressing portion (14) along the moving direction, and the moving direction (X) of the pressing portion (14) is set in the holding portion (3). ) Wire to be bent (S)
A wire bending machine which is set in a direction deviated from the reference direction (Y) facing the mounting surface toward the bending side by an angle smaller than the planned bending angle (θ). 2. A deviation angle of a moving direction of the pressing portion (14) from the reference direction (Y) is substantially equal to a predetermined bending angle (θ).
2. The wire rod bending machine according to claim 1, which is one-half.