JPH06182452A - Bending device for metallic member - Google Patents

Abstract

PURPOSE:To enable the bending of a metallic tube in a desired shape in the bending in which a prescribed part of a metallic tube is bent in one direction and its upstream side is bent in a prescribed direction. CONSTITUTION:Bending is performed by moving a movable gyro-die 3 while a metallic tube 1 is pushed out in the direction of a fixed die 2 by a pusher 4. By the movement of a movable gyro-die 3, the prescribed part of the metallic tube 1 is bent in one direction; and then this bent part in one direction is partially bent back and, after that, the upstream side of the bent part in one direction is bent in the prescribed direction; when the metallic tube 1 is bent in one direction and the upstream side of this bent part in one direction is bent in the prescribed direction, a high frequency heating coil 5 by which the metallic tube 1 at the exit part of the fixed die 2 is heated is at least activated, and when the bent part in one direction is partially bent back, only the high frequency heating coil 6 by which the metallic tube 1 at the entrance part of the movable gyro-die 3 is activated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for bending a metal member such as an aluminum mold member which is pushed by a pusher to bend the metal member.

[0002]

2. Description of the Related Art In recent years, in order to reduce the weight of a vehicle body, a drawer or extrusion material of a light alloy such as an aluminum alloy or a magnesium alloy is used as a frame material thereof. When such a metal member is used as a frame material for a vehicle body, it is bent into a predetermined shape by a bending device.

A bending apparatus of this type is disclosed in Japanese Patent Laid-Open No. Hei 3
As disclosed in Japanese Laid-Open Patent Publication No. 66419, a fixed die and a movable gyro die movable in three dimensions are provided, and the above metal member is passed through the fixed die and the movable gyro die to form a fixed die in the metal member. From the part that protrudes to the side opposite to the movable gyro die, that is, while moving the upstream end of the metal member, move the movable gyro die,
It is known to bend a metal member into a predetermined shape by forcibly moving it between a fixed die and a movable gyro die.

However, since bending resistance of the metal member is large in the bending process using the above-described bending device,
As shown in FIG. 6, for example, a rectangular tubular metal member 5
When 1 is passed through the fixed die 52 and the movable gyro die 53 and the upstream end of the metal member 51 is pushed by the pusher 54, if the metal member 51 is made of an aluminum material having a low yield point, The buckling portion 51a is apt to occur due to plastic deformation between the fixed die 52 and the fixed die 52.

On the other hand, in Japanese Patent Laid-Open No. 58-93516, a conventional type bender is provided with a high-frequency heating coil for high-frequency induction heating the metal member on the outer periphery of the metal member in the vicinity of the exit from the guide roll. Is disclosed. Therefore, as shown in FIG. 7, it is conceivable to provide the above-described high-frequency heating coil 55 in the above-described bending apparatus. According to such a configuration, the bent portion of the metal member is heated and the deformation of this portion is caused. Since the resistance decreases, the buckling portion 51 between the fixed die 53 and the pusher 54 is
Generation of a can be suppressed.

[0006]

However, in the above configuration, when the metal member 51 is first bent in one direction and then the upstream side portion is bent in the opposite direction, that is, the metal member 5 is bent.
When 1 is bent into a substantially S-shape, there is a problem that a desired curved shape cannot be obtained.

That is, in the bending process as described above, first, the movable gyro die 53 is moved from the linear state shown in FIG. 8A to the movable gyro die 53 as shown in FIG. 8B. Direction, the metal member 51 is first bent in one direction, and then the movable gyro die 53 is temporarily returned to the initial position aligned with the fixed die 52 as shown in (c) of FIG. As shown in (d) of the figure, the movable gyro die 53
Is rotated and moved in the opposite direction to bend the metal member 51 in the opposite direction. In this case, as shown in (c) of the figure, when the movable gyro die 53 is returned to the initial position and the metal member 51 is bent back, the gap between the fixed die 52 and the movable gyro die 53 in the metal member 51 is reduced. The part of (1) cannot return from the bent state as shown in (b) of the figure to the linear state shown by the chain double-dashed line in (c) of the figure. Therefore, after that, as shown in (d) of the same figure, when bending in the opposite direction, a desired curved shape cannot be obtained.

[0008]

In order to solve the above-mentioned problems, a bending apparatus for a metal member according to a first aspect of the present invention is provided with a pusher on the upstream side of a fixed die and is movable on the downstream side of the fixed die. Equipped with a die, for example a movable gyro die,
In the bending apparatus of the metal member for moving the movable die while pushing the metal member, for example, the metal pipe from the rear end side toward the fixed die by the pusher, the metal member of the fixed die outlet is The first heating means for heating and the second heating means for heating the metal member at the entrance of the movable die are provided, and the first heating means and the second heating means are provided.
A heating control means for controlling the operation with the heating means is provided, and the heating control means bends a predetermined part of the metal member in one direction by moving the movable die in one direction from the initial position, and then, By returning the movable die from the position in one direction to the initial position, the bending portion of the metal member is partially bent back in one direction, and thereafter, the movable die is moved in a predetermined direction, for example, in the one direction or When the metal member is bent in one direction as described above, and when the metal member is bent in one direction as described above, when the metal member is bent in one direction by moving in the other direction, the upstream side of the bent portion is bent in a predetermined direction. When the upstream side of the bent portion of the above is bent in a predetermined direction, at least the first heating means is operated, and when partial bending back of the bent portion of the metal member in one direction is performed, It is characterized in that only the second heating means is for controlling to operate.

In order to solve the above-mentioned problems, the apparatus for bending a metal member according to a second aspect of the present invention is the apparatus for bending a metal member according to the first aspect, wherein the heating control means is a metal member using a movable die. It is characterized in that the metal member is controlled to be heated to a temperature corresponding to the curvature of the bending process.

In order to solve the above-mentioned problems, a metal member bending apparatus according to a third aspect of the present invention is the metal member bending apparatus according to the first aspect, wherein the first heating means and the second heating means are provided. , The inner surface side and the outer surface side of the bent portion of the metal member can be heated to different temperatures, and the heating control means, based on the bending direction of the metal member by the movable die, the inner surface of the bent portion of the metal member. It is characterized in that the temperature on the side is controlled to be lower than the temperature on the outer surface side.

[0011]

According to the structure of claim 1, when the movable die moves in one direction from the initial position to bend a predetermined portion of the metal member in one direction, and when the movable die moves in a predetermined direction,
For example, when the upstream side of the bent portion in one direction of the metal member is bent in a predetermined direction by moving in one direction or the other direction, at least the metal member at the fixed die outlet is controlled by the heating control means. Since it is heated, the deformation resistance of the bending portion is reduced, and the bending can be performed without causing a buckling portion between the fixed die and the pusher.

Further, when the movable die is partially bent back in one direction in the metal member by returning from the position in the one direction to the initial position, only the metal member at the inlet portion of the movable die is used. Is heated, the portion of the metal member between the fixed die and the movable die can be linearly returned. Therefore, when the metal member is further bent in the predetermined direction as described above, that portion can be formed into a favorable curved shape, the predetermined portion of the metal member is bent in one direction, and the upstream side thereof is further set in the predetermined direction. In the bending process of bending, the metal member can be processed into a desired shape.

According to the structure of claim 2, in addition to the function of the structure of claim 1, the heating control means heats the metal member to a temperature corresponding to the curvature of the bending process of the metal member by the movable die. Since the means is controlled, the occurrence of buckling in the bending portion due to excessive heating of the metal member,
Further, it is possible to prevent the occurrence of cracks in the bent portion due to insufficient heating, and it is possible to perform favorable bending as compared with the case where the heating temperature is always set to be constant.

According to the structure of claim 3, in addition to the function of the structure of claim 1, the heating control means can heat the inner surface side and the outer surface side of the bent portion of the metal member to different temperatures. The heating control means, based on the bending direction of the metal member by the movable die, the first heating means and the second heating means so that the temperature on the inner surface side of the bent portion of the metal member becomes lower than the temperature on the outer surface side. Therefore, it is possible to prevent the occurrence of buckling on the inner surface side of the bending and the occurrence of cracks on the outer surface side of the bending in the metal member, and to make the inner surface side and the outer surface side of the bending of the metal member the same. Better bending is possible as compared with the case of heating to a temperature.

That is, for example, when the inner surface side and the outer surface side of the bending of the metal member are heated to the same temperature, if the bending portion is heated to a temperature that can prevent cracking on the outer surface side of the bending, On the inner surface side of the, the yield point decreases too much and buckling occurs, but if the bending part is heated to a temperature that can prevent buckling on the inner surface side of bending, sufficient bending will not occur on the outer surface side of bending. It does not occur and cracks occur. Therefore, if the temperature control as described above is performed on the inner surface side and the outer surface side of the bending of the metal member, favorable bending can be performed without causing buckling and cracking in the bending portion.

[0016]

【Example】

[Embodiment 1] An embodiment of the present invention will be described below with reference to FIGS. The bending apparatus of this embodiment is shown in FIG.
As shown in FIG. 3, the rectangular metal tube 1 as a metal member which is an extruded material of aluminum alloy is bent. This bending apparatus is provided on the fixed die 2, a movable gyro die 3 as a movable die provided in front of the fixed die 2, that is, on the downstream side in the extrusion direction of the metal tube 1, and on the upstream side of the fixed die 2. Ta pusher 4
Is equipped with.

The fixed die 2 is fixed at a predetermined position,
The movable gyro die 3 is driven in the up / down / left / right direction and the rotation direction, that is, the three-dimensional direction according to the bending direction of the metal tube 1. The pusher 4 has a tubular shape whose cross section is almost the same as that of the metal tube 1, and pushes the upstream end of the metal tube 1 to push the metal tube 1 inserted into the fixed die 2 and the movable gyro die 3 to the downstream side. It is supposed to be pushed out to.

Further, the bending apparatus is provided with a high frequency heating coil 5 on the outer circumference of the metal tube 1 at the exit of the fixed die 2 and a high frequency heating coil on the outer circumference of the metal tube 1 at the entrance of the movable gyro die 3. 6 is provided. These high-frequency heating coils 5 and 6 are for high-frequency induction heating of the metal tube 1, and as shown in FIG.
It is connected to the high frequency oscillator 8 via. The high frequency heating coil 5 and the high frequency oscillator 8 constitute a first heating means, and the high frequency heating coil 6 and the high frequency oscillator 8 constitute a second heating means.

The switching operation of the changeover switch 7 and the operation of the high-frequency oscillator 8 are based on a drive control signal output from a gyro die drive control device 10 for controlling a drive device (not shown) of the movable gyro die 3. It is controlled by the heating control device 9. That is, the heating control device 9 activates the high frequency oscillator 8 when bending is performed by the movable gyro die 3, and the output of the high frequency oscillator 8 is supplied to a predetermined high frequency heating coil 5 or high frequency heating coil 6. Thus, the changeover switch 7 is made to perform the changeover operation. The changeover switch 7 and the heating control device 9 constitute a heating control means.

In the above structure, when the predetermined portion of the metal pipe 1 is bent in one direction and the upstream side thereof is bent in the opposite direction by the bending device, that is, when the metal pipe 1 is bent into an almost S-shape. First, as shown in FIG.
The metal tube 1 is inserted from the fixed die 2 side into the fixed die 2 and the movable gyro die 3.

Next, while pushing out the metal tube 1 with the pusher 4 at a constant speed, the high-frequency oscillator 8 is operated by the control of the heating control device 9 and the changeover switch 7 is switched to the high-frequency heating coil 5 side, so that the metal tube Fixed die 2 in 1
Heat the outlet of the. In this state, as shown in (b) of the same figure from the state shown in (a) of FIG. 3, the movable gyro die 3 is moved while being rotated in one direction, and the metal tube 1 is bent in one direction.

Next, the changeover switch 7 is switched to the high frequency heating coil 6 side to heat the inlet portion of the movable gyro die 3 in the metal tube 1, and the movable state is moved from the above state as shown in FIG. The gyro die 3 is returned to the original initial position, and the fixed die 2 and the movable gyro die 3 in the metal tube 1 are
The part between and is bent back.

Next, the changeover switch 7 is switched again to the high-frequency heating coil 5 to heat the outlet of the fixed die 2 in the metal tube 1 and rotate the movable gyro die 3 in the direction opposite to the above direction. Move and bend metal tube 1 in the opposite direction. This completes the substantially S-shaped bending process for the metal tube 1.

Bending from the state shown in FIG. 3 (a) to the state shown in FIG. 3 (b), and the state shown in FIG. 3 (c) to the state shown in FIG. 3 (d). In the case of bending into a state, the high frequency heating coil 6 may be operated in addition to the high frequency heating coil 5. In this case, the changeover switch 7 switches between a state in which the output of the high frequency oscillator 8 is supplied to both the high frequency heating coil 5 and the high frequency heating coil 6, and a state in which the output is supplied only to the high frequency heating coil 6.

In the above bending process, when the metal pipe 1 is bent from the state shown in FIG. 3 (a) to the state shown in FIG. 3 (b), and from the state shown in FIG. 3 (c). (D)
When the metal tube 1 is bent into the state shown in Fig. 3, the high frequency heating coil 5 heats the outlet of the fixed die 2 in the metal tube 1, and the deformation resistance of the bent portion is reduced, so the fixed die 2 and the pusher 4 The bending process can be performed without buckling the metal tube 1 between and.

When the portion of the metal tube 1 between the fixed die 2 and the movable gyro die 3 is bent back from the state shown in FIG. 3B to the state shown in FIG. 3C, ,
Since the inlet part of the movable gyro die 3 in the metal tube 1 is heated by the high-frequency heating coil 6, the portion of the metal tube 1 between the fixed die 2 and the movable gyro die 3 can be returned straight. Therefore, as shown in (d) of the same figure, when the metal pipe 1 is further bent in the opposite direction, that portion can be formed into a favorable curved shape, and the metal pipe 1 can be appropriately bent into an S-shape. It can be processed.

[Embodiment 2] Another embodiment of the present invention is shown in FIG.
This will be described below with reference to FIGS. 4 and 5. Incidentally, for convenience of explanation, the same reference numerals are given to the means having the same functions as the means shown in the drawings of the above-mentioned embodiment, and the explanation thereof will be omitted.

The bending apparatus of the present embodiment is provided with high-frequency heating coils 21a to 21d as shown in FIG. 4 in place of the high-frequency heating coil 5 in the configuration shown in FIG. Instead, it is provided with high frequency heating coils 22a to 22d arranged in the same manner as the above high frequency heating coils 21a to 21d. These high-frequency heating coils 21a to 21d and 22a to 22d individually correspond to the four surfaces of the metal tube 1 having a rectangular cross section.

As shown in FIG. 5, the high frequency heating coils 21a and 22a are connected to a high frequency oscillator 24a via a changeover switch 23a, and the high frequency heating coil 21b is connected.
22b is connected to the high frequency oscillator 24b via the changeover switch 23b, and the high frequency heating coils 21c and 22c
Is a high-frequency oscillator 24c via a changeover switch 23c.
The high frequency heating coils 21d and 22d are connected to the high frequency oscillator 24d via the changeover switch 23d. And the above-mentioned high-frequency heating coils 21a-2
1d and the high frequency oscillators 24a to 24d constitute a first heating means, and the high frequency heating coils 22a to 22d and the high frequency oscillators 24a to 24d constitute a second heating means.

Further, the changeover switches 23a-23
The switching operation of d and the operation of the high frequency oscillators 24a to 24d are controlled by the heating control device 25 as the heating control means based on the drive control signal output from the gyro die drive control device 10. The changeover switches 23a to 23d and the heating control device 25 constitute heating control means.

The heating control device 25 described above uses the high-frequency oscillator 2 when bending is performed by the movable gyro die 3.
4a to 24d are activated, and the high frequency oscillator 24
Outputs a to 24d have predetermined high frequency heating coils 21a to 2d
1d or high-frequency heating coils 22a to 22d are supplied to the changeover switches 23a to 23d so as to perform a switching operation. The switching operation of the changeover switches 23a to 23d under the control of the heating control device 25 corresponds to the operation of the changeover switch 7 described above, and the high frequency heating coils 21a to 21d are operated at the timing when the high frequency heating coil 5 operates. , The high frequency heating coil 6 is operated at the above-described timing when the high frequency heating coil 6 is operated
a to 22d are operated.

That is, in FIG. 3, the high frequency heating coil 5
Will be replaced with high-frequency heating coils 21a to 21d, and the high-frequency heating coil 6 will be replaced with high-frequency heating coils 22a to 22d. In the following description, when bending is performed from the state shown in FIG. , High frequency heating coil 2
1a to 21d are ON, high frequency heating coils 22a to 22d
Is turned off, and when the bending-back shown in (c) of the figure is performed from the state shown in (b) of the figure, the high-frequency heating coils 21a to 21d are turned off and the high-frequency heating coils 22a to 22a-
22d is turned on. Further, when the bending shown in (d) of the figure is performed from the state shown in (c) of the figure, the high-frequency heating coils 21a to 21d are turned on and the high-frequency heating coil 22a is turned on.
~ 22d is turned off.

Further, the heating control device 25 heats the metal tube 1 based on the bending curvature of the metal tube 1 indicated by the drive control signal when the bending curvature of the metal tube 1 is small. The temperature is relatively low,
When the bending of the metal tube 1 has a large curvature, the high frequency oscillators 24a to 24d are controlled so that the heating temperature for the metal tube 1 becomes relatively high. The heating time is also controlled according to the length of the bent portion.

By the control according to the curvature of the bending work as described above, buckling occurs in the bending work part due to excessive heating of the metal tube 1, and cracking occurs in the bending work part due to insufficient heating. It is possible to prevent the above, and it becomes possible to perform favorable bending as compared with the case where the heating temperature is always set to be constant.

As described above, each high frequency heating coil 2
1a to 21d and high frequency heating coils 22a to 22d
When the same heating operation is performed on each of the high frequency heating coils 21a to 21d, as shown in FIG.
In addition to the one high-frequency heating coil 6 corresponding to the above, a configuration including one changeover switch and one high-frequency oscillator corresponding thereto, that is, the configuration shown in FIGS. 1 and 2 is also applicable.

Further, the heating control device 25 controls the heating temperature to be different between the outer surface side and the inner surface side of the bending of the metal tube 1 based on the bending direction of the metal tube 1 indicated by the drive control signal, that is, It is controlled so that the outer surface side of the bend has a relatively high temperature and the inner surface side of the bend has a relatively low temperature. By controlling the temperature according to such a bending direction, it is possible to prevent buckling on the inner surface side of the bending and cracks on the outer surface side of the bending of the metal tube 1, and it is possible to perform favorable bending. Becomes

That is, for example, when the inner surface side and the outer surface side of the bending of the metal tube 1 are heated to the same temperature, if the bending portion is heated to a temperature at which cracking on the outer surface side of the bending can be prevented, Buckling occurs on the inner side of bending. This is because the yield point is lowered too much in performing the operation of contracting the inner surface side of bending during bending. On the other hand, if the bending portion is heated to a temperature that can prevent buckling on the inner surface side of bending, sufficient bending does not occur on the outer surface side of bending and cracking occurs. Therefore, if the temperature control as described above is performed on the inner surface side and outer surface side of the bending of the metal tube 1, good bending can be performed without buckling and cracking in the bending portion.

In the above embodiment, the bending apparatus bends the metal pipe 1 in one direction and then bends the upstream side in the opposite direction, but the invention is not limited to this. After the pipe 1 is bent in one direction, its upstream side may be bent in a predetermined direction, that is, in the same one direction or another direction, and in this case as well, good bending can be performed. .

The above heating means is composed of a high frequency heating coil and a high frequency oscillator. However, the heating means is not limited to this, and a known heating technique capable of heating a predetermined region of the metal tube 1 is applied. be able to.

The bending apparatus, which processes a metal member having a rectangular closed cross section, includes a fixed die 2, a movable gyro die 3 and a high frequency heating coil 5.
By selecting the shape of 6 ・ 21a to 21d ・ 22a to 22d according to the shape of the metal member to be processed,
It can also be applied to the processing of a metal member having a circular closed section, a U-shaped open section, an L-shaped open section, or the like.

[0041]

As described above, the apparatus for bending a metal member according to the first aspect of the present invention heats the metal member at the fixed die outlet and the metal member at the movable die inlet. In addition to the second heating means, a heating control means for controlling the operation of the first heating means and the second heating means is provided, and the heating control means is provided by moving the movable die in one direction from the initial position. A predetermined portion of the metal member is bent in one direction, and then the movable die is returned from the position in the one direction to the initial position to partially bend back the bent portion of the metal member in one direction. , And then, when the movable die is moved in a predetermined direction, the metal member is bent in one direction as described above during bending in which the upstream side of the bent portion of the metal member in one direction is bent in a predetermined direction. And this one When the upstream side of the bent portion of the metal member is bent in a predetermined direction, at least the first heating means is activated, and when the partial bending back of the bent portion of the metal member in the one direction is performed, This is a configuration in which only two heating means are controlled to operate.

As a result, when the bent portion of the bent portion of the metal member in one direction is partially bent back, the portion of the metal member between the fixed die and the movable die can be linearly returned. When the metal member is further bent in the predetermined direction, that portion can be formed into a favorable curved shape. Therefore, in the bending process of bending a predetermined portion of the metal member in one direction and further bending the upstream side of the metal member in the predetermined direction, the metal member can be bent into a desired shape.

As described above, the apparatus for bending a metal member according to a second aspect of the present invention is the apparatus for bending a metal member according to the first aspect of the present invention, wherein the heating control means controls the bending of the metal member by the movable die. The configuration is such that the metal member is heated to a temperature according to the curvature.

As a result, in addition to the effect of the first aspect of the present invention, buckling occurs in the bent portion due to excessive heating of the metal member and cracking occurs in the bent portion due to insufficient heating. It is possible to prevent this, and it is possible to perform an excellent bending process as compared with the case where the heating temperature is always set to be constant.

As described above, the apparatus for bending a metal member according to a third aspect of the present invention is the apparatus for bending a metal member according to the first aspect, wherein the first heating means and the second heating means are:
The inner surface side and the outer surface side of the bent portion of the metal member can be heated to different temperatures, and the heating control means, based on the bending direction of the metal member by the movable die, the inner surface side of the bent portion of the metal member. The temperature is controlled to be lower than the temperature on the outer surface side.

As a result, in addition to the effect of the first aspect of the present invention, it is possible to prevent the occurrence of buckling on the inner surface side of the bending and the occurrence of cracks on the outer surface side of the bending in the metal member. As compared with the case where the inner surface side and the outer surface side of the bending are heated to the same temperature, there is an effect that excellent bending can be performed.

[Brief description of drawings]

FIG. 1 is a perspective view of a metal member bending apparatus according to an embodiment of the present invention.

2 is a block diagram showing a configuration for controlling a heating operation by each high-frequency heating coil shown in FIG.

FIG. 3 is an explanatory view showing a bending operation of a metal pipe by the bending apparatus shown in FIG.

FIG. 4 shows another embodiment of the present invention, and is an explanatory view of a disposition state of a high frequency heating coil with respect to a metal tube.

5 is a block diagram showing a configuration for controlling a heating operation by each high-frequency heating coil shown in FIG.

FIG. 6 shows a bending process using a conventional bending device.
It is a perspective view showing the state where a buckling part occurred in a metal member.

FIG. 7 is a perspective view of a bending apparatus for a metal member, which is considered to have a heating function for a metal tube.

8 is an explanatory view showing a bending operation of a metal pipe by the bending apparatus shown in FIG.

[Explanation of symbols]

1 Metal Tube (Metal Member) 2 Fixed Die 3 Movable Gyro Die (Movable Die) 4 Pusher 5 High Frequency Heating Coil (First Heating Means) 6 High Frequency Heating Coil (Second Heating Means) 7 Changeover Switch (Heating Control Means) 8 High Frequency Oscillator (first heating means, second heating means) 9 Heating control device (heating control means) 21a to 21d High frequency heating coil (first heating means) 22a to 22d High frequency heating coil (second heating means) 23a to 23d Changeover switch (Heating control means) 24a to 24d High-frequency oscillator (first heating means, second heating means) 25 Heating control device (heating control means)

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Katsuya Nishiguchi 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Motor Corporation

Claims (3)

[Claims] 1. A pusher is provided on the upstream side of a fixed die, and a movable die is provided on the downstream side of the fixed die. The pusher moves the movable die while pushing the metal member from the rear end side toward the fixed die. In a bending apparatus for a metal member that performs bending by means of: a first heating means for heating the metal member at the fixed die outlet, and a second heating means for heating the metal member at the movable die inlet; A heating control means for controlling the operation of the first heating means and the second heating means is provided, and the heating control means moves the movable die in one direction from the initial position so that a predetermined portion of the metal member is made uniform. Direction, and then the movable die is returned from the position in one direction to the initial position to partially bend back the bent portion in one direction in the metal member, and thereafter, When the movable die moves in a predetermined direction, the metal member is bent in one direction as described above during bending in which the upstream side of the bent portion of the metal member in one direction is bent in a predetermined direction. When the upstream side of the bending portion in the direction is bent in the predetermined direction, at least the first heating means is operated, and when the bending portion in the one direction in the metal member is partially bent back, An apparatus for bending a metal member, characterized in that only the second heating means is controlled so as to operate. 2. The heating control means controls the metal member so that the metal member is heated to a temperature corresponding to a curvature of bending of the metal member by the movable die. Bending equipment for metal parts. 3. The first heating means and the second heating means are capable of heating the inner surface side and the outer surface side of a bent portion of a metal member to different temperatures, and the heating control means is movable. The metal according to claim 1, wherein the temperature on the inner surface side of the bent portion of the metal member is controlled to be lower than the temperature on the outer surface side based on the bending direction of the metal member by the die. Bending equipment for parts.