JP2002282990A - Multistage type heading machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multistage type heading machine capable of improving transfer stability between blank dies, improving insertability into the blank dies which are transferred to a lower stage and performing these with a simple structure. SOLUTION: In the multistage type heading machine having a plurality of dies 4...4, a plurality of punches 5...5 which move forwards and backwards to and from dies 4...4, a knockout member 6...6 which extrude blanks X from the dies 4...4, and a plurality of material transfer chucks 11...11 which reciprocate between the adjacent dies 4...4, a support member 46 whose edge is movable between an acting position located in front of the material grip part of the chuck 11, and a retreating position located at the side of the material grip part of the chuck 11, and a hoisting mechanism 30a which moves the support member 46 to the acting position when the chuck 11 is at the front position of the die 4 and then moves the support member 46 to the retreating position after moving to the front position of the die 4 at the lower stage, are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-stage press forming machine for forming a material into a predetermined shape with a plurality of dies and punches forming a pair, and belongs to the technical field of metal plastic working.

[0002]

2. Description of the Related Art A multi-stage press forming machine used for manufacturing bolts, nuts and other various parts has a plurality of dies arranged side by side on a machine base, and approaches and separates from each of these dies. A plurality of punches are arranged on the ram so as to face each of the above dies, and a plurality of forging stations are formed by the dies and the punches facing each other. , The material is formed into a product having a predetermined shape through a plurality of steps of forging.

In this type of multi-stage press forming machine, a knockout means for pushing out a material formed by forging at each forging station from the inside of each die in synchronization with the advance / retreat operation of the ram, and a method for transferring the material to the next Material transfer means and the like which are sequentially supplied to the forging station in the process are provided.

Among them, the knockout means is inserted through the knockout member from the rear into the die,
The knockout member is configured to reciprocate back and forth within a predetermined range in synchronization with the movement of the ram, and the forged material is pushed forward of the die by advancing the knockout member in synchronization with the retraction of the ram. And transfer it to the material transfer means.

[0005] The material transfer means includes a plurality of chuck mechanisms for holding the material on a movable plate supported by the machine base and slidable in the direction in which the dies are arranged.
The chuck mechanism is reciprocated between adjacent stations by reciprocating in the direction in which the dies are arranged in synchronization with the movement of the ram, and the material received at the station in the previous process is supplied to the station in the next process. It is configured to be.

When the processed blank is of a short axis, the blank is pushed out by the knockout means after the processing, and the material transfer means is waiting at the front position of the die to hold the blank. May not be held and may fall. If dropped, not only will the blank be damaged, but also the processing operation will be interrupted. Therefore, in order to prevent the blank from being dropped, a blank stopper that sandwiches the blank pushed out by the knockout means and is sandwiched between the blank and the knockout means may be provided. Japanese Patent Laid-Open Publication No. 7-9541 discloses a blank stopper of this type.

According to this publication, as shown in FIG. 8, a multi-stage press forming machine 100 provided with this blank stopper.
101, a plurality of dies 101... 101 arranged side by side on a machine base, a plurality of punches (not shown) moving forward and backward with respect to these dies 101. Plate 102 which reciprocates in a direction, and a plurality of material transfer means 10 attached to the movable plate 102
103, and the material transfer means 103 is provided with the chuck body 10 attached to the movable plate 102.
4 and a spindle 105 provided on the chuck body 104
Pair of claw members 10 rotatably supported about
6, 106, and a chuck pawl opening / closing mechanism (not shown) for opening and closing the pawl members 106, 106 in synchronization with advance / retreat of the die.

The machine base is provided with a knockout means (not shown) for pushing out the blank B from the inside of the die in synchronization with the advance / retreat of the punch, and a blank stopper for holding the blank B between the knockout means and the knockout means. A reference numeral 110 is provided in the vicinity of the material transfer means 103 on the subsequent stage.

The blank stopper 110 includes a lever member 111 rotatably supported on the support shaft 105 together with the chuck pawl 106 in a superposed state, and a lever member 111.
Extension rod 112 extending upward from the upper end of the machine, and the upper end of the extension rod 112 is slidably inserted through, and inserted through a support 113 provided at the top of the machine base to be rotatable in a vertical plane. And a stopper member 115 attached to the lower end of the lever member 111.
And A lever member 111 and a stopper member 115 are similarly attached to the material transfer means 103 adjacent to the upper stage, and the upper end of the lever member 111 is linked to the upper end of the lever member 111 on the rear stage by a link member. 116.

According to this, the blank B pushed out of the die 101 by the knockout means is
The upper die 1 held by the material transfer means 103
01 to the lower die 101.

At this time, since the fulcrum pin 114 is a fixed point, the lever 111 rotates around the support shaft 105 in accordance with the movement of the movable plate 102, and as a result, the position of the stopper member 115 with respect to the die 101 is reduced. Changes. That is, the material transfer means 103 is connected to the upper die 10.
1, the front end portion 115a of the stopper member 115 is positioned in front of and supports the blank B extruded from the upper die 101, and the material transfer means 103 is moved to the lower die side. When moved to the front of the die 101, the die 101
It is configured not to interfere with the punch advancing toward 1.

[0012]

However, in the blank stopper 110, the upper end of the extension rod 112 fixed to the lever member 111 is supported by the fulcrum pin 114.
5a always rotates around the fulcrum pin 114 in accordance with the reciprocating movement of the movable plate 102. As a result, the position of the stopper member 115 with respect to the die 101 is determined by the position of the fulcrum pin 114, the inclination of the stopper member 115, , Spindle 1
The material transfer means 103 is provided on the front side of the blank B by a mechanical position relationship such as the position of the upper die 101.
It is located only when it is located on the front side, and it is retracted on the lower side. That is, the blank stopper 110
Can support the blank B only temporarily.

A surface of the stopper member 115 for supporting the blank B of the distal end portion 115a and the chuck pawl 106
Since a gap is provided between the blank and the punch side surface so as not to interfere with each other, when the blank is held by the claw member 106, its head slightly protrudes toward the punch side of the claw member 106. State. Therefore, in the case of a short-axis blank, during the transfer to the lower die 101 which is not supported by the stopper member 115, the material transfer means 1
It is necessary to support the blank B from the punch side since the blank is in an unstable state with its head slightly protruding toward the punch side of 03, and there is a possibility that the blank B being transported may fall.

In general, in processing by a multi-stage press forming machine, since a blank after processing often has an asymmetric shape in the front-rear direction than a blank before processing, the blank is formed by a die on the rear side. The blank is likely to be in an unstable state during the transfer, and the above-mentioned problem of dropping becomes large.

After the blank B is transferred to the lower die 101 by the material transfer means 103, the punch 1
In the state where the material transfer means 103 is opened to push the blank B into the die 101, the blank B slightly tilts in the case of a short-axis blank having the center of gravity in the front, and the axial center position is changed to the die 101. Misaligned with the axis of
A state occurs in which the punch cannot smoothly push the blank B, and as a result, the blank B may fall as in the above-described problem.

Further, when the stopper member 115 moves, the tip end portion 115a may rub the surface of the blank B and cause a scratch.

On the other hand, there are multi-stage forging machines having a blank stopper device other than the above-mentioned multi-stage forging machine 100, but these require a large-scale drive mechanism dedicated to the blank stopper, and are large and expensive. turn into.

Accordingly, the present invention improves the stability of the transfer of the blank between the dies, improves the insertability of the blank transferred to the lower die into the dies, and realizes these with a simple configuration. It is an object of the present invention to provide a multi-stage press forming machine.

[0019]

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention is characterized in that it is configured as follows.

First, the invention described in claim 1 of the present application comprises a plurality of dies arranged in parallel on a machine base, and a plurality of punches provided on a ram moving toward and away from these dies and facing each of the dies. A knockout member for extruding a material from the inside of each die in synchronization with the retraction of the punch; a plurality of chucks attached to a mounting member that reciprocates in the direction in which the dies are arranged in parallel and reciprocating between adjacent dies; A multi-stage press forming machine having a chuck opening / closing mechanism that operates through a cam mechanism by rotation of a chuck opening / closing shaft extending in the direction, closes the chucks in front of the upper die, and opens in front of the lower die. So,
A support member disposed in the vicinity of the mounting position of the lowermost chuck in the mounting member, the tip of which is movable between an operating position of a material gripping portion of the chuck and a retracted position on a side thereof; And a drive mechanism for moving the support member to the operation position when the chuck is at the front position of the upper die, and moving the chuck to the retreat position after the chuck moves to the front position of the lower die. It is characterized by being provided.

According to the present invention, in the multi-stage press forming machine, the tip moves between the operating position of the material holding portion of the chuck and the retreating position on the side near the mounting position of the lowermost chuck. When the enabled support member is provided, and the chuck is located at the front position of the upper die, the support member is located at the operation position, and the chuck is moved to the front position of the lower die. A drive mechanism for moving the support member to the retracted position later is provided, so that the material held by the material holding portion of the chuck by the upper die is transferred to the front position of the lower die. During this time, the support member is continuously located at the front of the working position of the material gripping portion to stably support the material, and after moving to the front position of the lower die, the support member moves to the retracted position for the first time. And thus to avoid the interference of the advance to come punch. Thereby, the support member continuously supports the blank during the transfer to the lower side of the blank, and the transportability of the blank is stabilized.

The invention described in claim 2 of the present application is
The invention according to claim 1 is characterized in that the drive mechanism is configured to operate by rotation of the chuck opening / closing shaft.

According to the present invention, since the drive mechanism is configured to operate by rotation of the chuck opening / closing shaft, there is no need to separately provide a drive source for operating the drive mechanism, and the configuration is simplified.

Next, according to a third aspect of the present invention, in the second aspect of the invention, the support member is provided at a lower side of the lowermost chuck mounting position of the mounting member with the juxtaposed interval of the chucks. The spare chucks are provided at the same intervals and are swingably mounted using the fulcrum of one of the chuck claws, and the driving mechanism is
The opening and closing mechanism of the preliminary chuck is characterized in that it is configured to operate via a cam mechanism by rotation of a chuck opening and closing shaft.

According to this invention, the support member is swingable at the pre-chuck mounting position of the mounting member by using the fulcrum of the chuck pawl, and the driving mechanism is the opening and closing mechanism of the pre-chuck. Therefore, the fulcrum and the drive mechanism of the support member and the chuck can be shared, and there is no need to provide a fulcrum and a drive mechanism dedicated to the support member. That is, it is only necessary to remove the pair of chuck claws and attach a support member instead of one of the claws. As a result, this does not complicate the configuration.

Further, the invention described in claim 4 of the present application is:
In any one of the first to third aspects of the present invention, an auxiliary drive mechanism is provided for displacing the distal end of the support member toward the die immediately before the support member moves from the operating position to the retracted position. It is characterized by the following.

According to the present invention, since the auxiliary driving mechanism for displacing the front end of the support member toward the die is provided immediately before the support member moves from the operation position to the retracted position, the material can be formed by punching. Prior to being pushed into the die, it can be inserted into the die. As a result, even if the material transfer means is opened, the insertability of the blank into the die can be improved.

Further, the invention according to claim 5 of the present application provides:
The invention according to claim 4 is characterized in that the auxiliary drive mechanism is configured to operate by rotation of the chuck opening / closing shaft.

According to the present invention, since the auxiliary drive mechanism is configured to operate by rotation of the chuck opening / closing shaft, there is no need to separately provide a drive source for operating the auxiliary drive mechanism. Therefore, the configuration does not become complicated.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A multi-stage press forming machine according to an embodiment of the present invention will be described below.

As shown in FIGS. 1 and 2, a cutter 3 for cutting a wire supplied from the outside into a predetermined size to form a material is provided at a predetermined position of a machine base 2 in the multi-stage press forming machine 1. A plurality of dies 4... 4 from coarse to fine are arranged at regular intervals. In addition, a plurality of punches 5... 5 are disposed in front of the dies 4, 4, and on a front surface of a ram (not shown) mounted on the machine base 2 so as to face each of the dies 4. Each of the dies 4... 4 and the punches 5.

Although not shown, the multi-stage press forming machine 1 includes a single drive source such as a motor, for example.
By moving the ram back and forth with respect to the die 4 by a ram drive mechanism (not shown) operated by the driving force of the drive source (not shown), the punches 5 mounted on the front surface of the ram during forward movement, The material is forged with the die 4. And the material that has been forged is die 4
And is pushed out of the die 4 by a knockout member 6 which is moved forward and backward in synchronization with the forward and backward movement of the punch 5 by a knockout drive mechanism (M2) (not shown).

On the other hand, a pair of rail members 8 and 9 are disposed at the front end of a support frame 7 disposed at the front part of the upper surface of the machine base 2 so as to face up and down.
A chuck block 10 slidable along 9 is provided.

The chuck block 10 is connected to a chuck driving mechanism (M3) (not shown) that reciprocates in the direction in which the dies 4... During the reciprocating movement, it is configured to make one reciprocating movement in the A-A direction by a distance equal to the interval between the adjacent dies 4, 4.

A plurality of material transfer chucks 11 for transferring the material from the upper die 4 to the lower die 4 are mounted on the front surface of the chuck block 10 at the same interval as the juxtaposed intervals of the dies 4. Have been. Each of the material transfer chucks 11 includes a pair of chuck claws 12 for holding a blank X. These chuck claws 12 and 12 are attached to support shafts 13 and 13 provided on the chuck block 10. Each is rotatable as a center.

A cam mechanism 14 for driving the chuck claws 12, 12 is provided inside the support frame 7. The cam mechanism 14 has a chuck opening / closing shaft 15 rotatably supported by the support frame 7 and connected to a cam driving mechanism (M4) (not shown).
Power from the chuck 11.
Open and close 1 Cam members 16... 16 are attached to the chuck opening / closing shaft 15.

The cam mechanism 14 has a first lever member 18 swingable about a support shaft 17 provided on the support frame 7 and a support shaft 19 provided on the chuck block 10. A swingable second lever member 20 is provided. This first lever member 18
A roller member 21 as a cam follower that slides on the cam member 16 is rotatably supported at one end of the first lever member, and an engaging member 22 attached to one end of the second lever member 20 is provided at the other end side. And a knocker plate 23 that comes into contact with the knocker plate 23 is attached.

Below the first lever member 18, there is provided a pin support 24 projecting upward. The pin support 24 has a vertically extending hole 24a, and a pin member 25 extending upward is slidably inserted into the hole 24a. Tip portion 25 of this pin member 25
a is engaged with the notch 18 a provided in the first lever member 18 and the distal end 2 of the pin member 25.
A spring member 26 is interposed between the lower surface of 5a and the upper surface of the pin support portion 24 to urge the knocker plate 23 of the first lever member 18 engaged with the distal end portion 25a upward. .

Above the knocker plate 23, a bolt member 27 inserted into the support frame 7 and the bolt member 2
7, a nut member 28 meshed with the first lever member 18 can be adjusted by rotating the bolt member 27 to adjust the tip position thereof. And That is, the lowermost position of the forked portion 20a of the lever member 20 located on the opposite side of the engaging member 22 engaged with the knocker plate 23 can be adjusted.

Above the chuck pawl 12, an elevating unit 30 connected to the bent portion 12a of the chuck pawl 12 via a connecting member 29 is provided. The elevating unit 30 is detachably attached to the chuck block 10 and has a hollow frame 31.
And a slide member 32 slidable vertically in the frame 31. A vertical shaft 33 that passes through the upper surface of the frame 31 is erected on the upper surface of the slide member 32, and a spring member 34 that urges the slide member 32 downward is wound around the vertical shaft 33. And
The horizontal shaft portion 32a provided on the slide member 32 includes:
The forked portion 20a of the second lever member 20 is engaged. The slide member 32 is guided to move up and down by a rail (not shown) formed on the frame 31.

According to this, when the chuck opening / closing shaft 15 rotates, the first lever member 18 swings about the support shaft 17 via the roller member 21 that slides on the cam member 16,
The knocker plate 23 moves up and down. At this time, the engaging member 22 engaged with the knocker plate 23 moves up and down, the second lever member 20 swings around the support shaft 19, and the second lever member 20 engages with the forked portion 20 a of the second lever member 20. The combined slide member 32 moves up and down in the frame 31.

When the slide member 32 moves upward, the pair of chuck claws 12 and 1 connected to the lower end of the slide member 32 via the connecting member 29 are connected.
2 is lifted upward at the bent portions 12a, 12a, and thus pivots about the support shafts 13, 13 to open each other. When the slide member 32 moves downward, the chuck claws 12, 12 are pushed down by the bent portions 12a, 12a, so that the chuck claws 12, 12 rotate about the support shafts 13, 13 to rotate with each other. It will be closed.

The chuck claws 12, 12 are connected to the ram drive mechanism (M1) and the knockout drive mechanism (M
2), chuck driving mechanism (M3) and cam driving mechanism (M
4), it is configured to operate in synchronization with the punch 5, the knockout member 6, or the chuck block 10, so that the timing of pushing the blank X by the knockout member 6 and the opening / closing timing of the chuck claws 12, 12 can be adjusted. Thereby, the blank X pushed out from the die 4 can be held by the chuck claws 12 and 12 and transferred to the front surface of the lower die 4 while maintaining the state.

Next, the blank supporter 40 shown in FIG.
This will be described with reference to FIG. 3 and FIG.
Reference numeral 0 denotes a spare support shaft 13a provided adjacent to the lowermost material transfer chuck 11, and a spare elevating unit 30a.
It is provided using and.

Specifically, the blank supporter 40
The bracket 42 is connected to the slide member 32 of the elevating unit 30a via a connecting member 41 and supported rotatably about the support shaft 13a as indicated by an arrow a. Lever member 4 supported rotatably as shown by arrow A through second support shaft 43
4 and a support member 46 integrally attached to the lever member 44 with bolts 45, 45. The support member 46 extends in the direction toward the upper die 4, has a shape curved upward in the middle thereof, and has a support portion 46 a at the tip end which expands toward the die 4 and contacts the blank X. are doing.

When the slide member 32 is moved upward, the support member 46 moves the support portion 46a to the die 4.
Is positioned at the axis of the die 4 in front of the
Is set to retreat to the downstream side of the die 4 when moving downward.

The timing of raising and lowering the slide member 32 in the blank supporter 40 is different from the timing of raising and lowering the slide members 32... 32 in the preceding three dies. That is, the advancing / retreating operation of the support member 46 and the opening / closing operation of the chuck are separately controlled. This will be described later.

Here, a screw shaft 47 is inserted near the center of the lever member 44 and meshes with a nut member 48 fixed to the lever member 44. According to this, by rotating the screw shaft 47 and adjusting the amount x of the screw shaft 47 protruding toward the protruding portion 42b provided at the lower portion on the front side of the bracket 42, the support portion 46a and the die 4
The maximum separation distance y from the front surface can be adjusted.

A bolt member 49 is inserted into the upper end of the lever member 40. According to this, the bolt member 49 is rotated, and the tip 4 of the bolt member 49 is rotated.
By adjusting the protrusion amount z of the lever member 9a from the lever member 44, the bolt member 49 is formed by the auxiliary drive mechanism 50 described later.
The amount of pushing of the blank X into the die 4 by the support portion 46a when is pushed outward can be adjusted.

The support member 46 has a long hole 46.
It is fixed to the lever member 44 by bolts 46, 46 via b, 46b. Thereby, the second spindle 4
The supporter member 46 can be swung with respect to the lever member 44 around the center 4. That is, the dimensional errors of each blank X that cannot be absorbed by the adjustment of the screw shaft 47 and the bolt member 49 can be absorbed by the elongated holes 46b.

Here, as shown in FIG. 2, a cam member 16 'for driving the support member 46 in the direction of arrow A is attached to the chuck opening / closing shaft 15. The cam 16 'for the support member 46 is the same as the cam 16 for opening and closing the chuck.
And the cam profile is different. These cam members 16... 16 and 16 ′ can be divided into two as shown in FIG. 2 and can be attached to and detached from the chuck opening / closing shaft 15. This facilitates replacement of the cam member, and controls the opening / closing operation of the material transfer chucks 11, 11 and the swinging operation of the blank supporter 40, the transfer operation of the material transfer chucks 11, the knockout operation, and the punch 5. 5 can be operated in coordination with the forward / backward movement.

An auxiliary drive mechanism 50 for displacing the support member 46 toward the die 4 is provided at the rear stage of the blank supporter 40 so as to take out power from the chuck opening / closing shaft 15. I have.

As shown in FIG. 4, the auxiliary drive mechanism 50 is rotatably supported by a support member swing cam 51 attached to the chuck opening / closing shaft 15 and a shaft 52 provided on the machine base 2 side. A follower 53 and a rod 56 slidably inserted into brackets 54 and 55 fixedly mounted on the machine base 2. One end of the follower 53 is rotatably slidably in contact with the cam 51. And a rotatable shaft 58 that engages with the rod 56 at the other end. The diameter of the rear portion 56b of the rod 56 is larger than that of the front portion 56a. The step surface 56
A spring member 59 is interposed between c and the bracket 55, and biases the entire rod 56 rearward (toward the follower 53), thereby pressing the roller member 57 against the cam 51.

According to this, when the chuck opening / closing shaft 15 rotates, the follower 53 is swung about the shaft 52 via the roller member 57 slidingly contacting the cam member 51 attached thereto. , This follower 5
The rod 56 connected to 3 is advanced and retracted.

A bolt member 60 that comes into contact with the bolt member 49 of the support member 46 (see FIG. 3) is screwed to the distal end of the rod 56. When the support member 46a of the support member 46 is positioned at the axis of the die 4 in front of the die 4, the blank supporter 40
The axis position of the bolt member 49 coincides with the axis position of the bolt member 60. At this time, if the rod 56 advances and pushes the bolt member 49 forward, the support member 46
In the direction of arrow A about the second support shaft 43 (see FIG. 3).
And the tip 46a is displaced in the die 4 direction.

Also in this case, the cam member 51 can be divided into a member 51a and a member 51b, and is detachable from the chuck opening / closing shaft 15. Thus, by making the cam profile of the cam member 51 different, it is possible to change the pushing timing, the pushing amount, and the pushing duration time of the rod 56, and the operation of the rod 56 is controlled by the material transfer chucks 11. 11
, The swinging operation of the blank supporter 40, the transfer operation of the material transfer chucks 11,..., The knockout operation, and the reciprocating operation of the punches 5,. In this case, immediately before the lowermost material transfer chuck 11 moves to the axial center position of the lower die 4 and the support member 46 retracts, the rod 56 removes the bolt member 49 of the lever member 44. By pressing, the support member 46 is set to be displaced to the die 4 side.

Next, the operation of the multi-stage press forming machine 1 will be described with reference to FIG.

The lowermost material transfer means 11 shown in FIG. 1 is positioned in front of the upper die 4 in a state where the blank X is held by the chuck claws 12, 12 and supports the blank supporter 40. A state in which the support portion 46a of the member 46 is located at the axis of the die 4 and is not displaced toward the die 4 is defined as a reference state.

First, FIG. 5A shows this reference state. After blank X is forged, knockout member 6
As a result, the support member 46 is pushed forward by the die 4, abuts against the support portion 46 a of the support member 46, and is supported by being sandwiched between the support member 46 and the knockout member 6. Chuck claws 12, 1
2 is holding the blank X.

Next, (b) shows a state in which the blank X is transferred to the lower die 4 while being held by the chuck claws 12, 12. Although the portion of the blank X on the punch 5 side protrudes from the chuck claws 12, 12, the blank X is stably transported without tilting because it is supported by the support portion 46 a of the support member 46. Knockout member 6 is retracted.

Next, (c) shows a state in which the blank X has been transferred to the front surface of the lower die 4. The axis of the blank X and the axis of the die 4 coincide, and the axis of the bolt member 49 and the axis of the rod 56 coincide.

Next, (d) shows a state where the blank X is being pushed into the die 4 by the displacement of the support member 46 toward the die 4. The chuck claws 12 and 12 hold the blank X.

Next, (e) shows a state in which the punch 5 has been advanced toward the die 4 after the pushing of the blank X into the die 4 is completed. The support member 46 is retracted to the side of the die 4, the chuck claws 12, 12 are opened, and the grip of the blank X is released.

As described above, until the blank X is transferred from the upper die 4 to the lower die 4, the blank X is continuously supported by the support member 46 and transferred in a stable state. Will be done.

Since the power is taken out from the chuck opening / closing shaft 15 for opening and closing the material transfer chuck 11 and the support member 46 is driven in the direction A, a new dedicated driving source or power transmission mechanism is newly provided. Or the addition of a dedicated structural member. As a result, even when the blank supporter 40 is provided, the size of the apparatus is not unnecessarily increased and the mechanism is not complicated as compared with a case where the blank supporter 40 is not provided.

The blank supporter 40 is mounted using one of the support shafts 13, 13 of the pair of chuck claws 12, 12, and the lifting / lowering mechanism 30 for driving the same is also used for transferring the material. The chuck 12 can be used. Thereby, the pair of chuck claws 12, 1
It is only necessary to remove 2 and attach a blank supporter 40 instead of one of the claws 12.

Further, an auxiliary drive mechanism 5 for displacing the support member 40 of the blank supporter 40 to the die 4 side.
0 is provided. According to this, the blank X is applied to the die 4 before the forging by the punch 5 in the lower die 4.
Can be inserted into the blank X, so that the blank X can be reliably forged.

Since the auxiliary drive mechanism 50 is also configured to extract power from the chuck opening / closing shaft 15, the swing in the direction A as well as the swing in the direction A of the support member 46 is newly performed. It is possible to reduce the need to newly install a dedicated drive source or a power transmission mechanism, or to add a dedicated component. Thus, the auxiliary drive mechanism 50 can be operated only by newly attaching the cam member 51 to the chuck opening / closing shaft 15.

As described above, the support shaft 13 and the elevating unit 3 for the existing material transfer chuck 11 are provided.
0, the blank supporter 40 can be provided, so that the blank supporter 40 and the auxiliary drive mechanism 50 can be attached to an existing multi-stage press forming machine, and the apparatus can be easily upgraded. Can be planned.

After the support member 46 pushes the blank X into the die 4, the support member 46 retreats to the side of the die 4. At this time, the bolt 60 retreats rearward and a force to the blank X side is applied. Since the support member 46 is not retracted, the support member 46 does not scratch the surface of the blank X when retracted.

In the above embodiment, the support member 4
The shape of 6 is arc-shaped in the vicinity of the center portion, but need not be arc-shaped if it does not interfere with the support member 46 at the time when the punch 5 on the subsequent stage advances.
What is necessary is just to make a shape which does not interfere.

Next, an example of another embodiment of the support member will be described.

First, the support member 46 'shown in FIG. 6 has a notch 46a' near the tip, and when the blank X is pushed out by the knockout member 6 ', the support member 46' swings from below. Then, at the notch 46a ',
Engage with the head of blank X2. On the other hand, a protrusion is formed at the tip of the knockout member 6 ', and the protrusion also deforms X2. That is, a hollow portion is formed in the blank X2 by the tip of the knockout member 6 '. In this case, since the blank X2 after forging is twisted on the knockout member 6 ', the notch portion 46a' is engaged with the head of the blank X2 fitted and pushed to the tip of the knockout member 6 '. With the retreat of the knockout member 6 ', the blank X2 can be reliably separated from the tip of the knockout member 6'.

Next, the support member 46 ″ shown in FIG. 7 has a breakage detection sensor 46a ″ near the tip.
The sensor 46a '' generates a different signal depending on whether or not a foreign object is touched. According to this, when the tip 5a 'of the punch 5' is broken while being stuck to the blank X3, the sensor 46a "does not touch the punch 5 ', thereby the punch 5' It is possible to reliably detect breakage of the tip 5a 'of 5'.

[0075]

As described above, according to the present invention, the stability of the transfer of the blank between the dies can be improved without complicating the structure in the multi-stage press forming machine, and the dies can be transferred to the lower dies. The insertability of the transferred blank into the die is improved. INDUSTRIAL APPLICABILITY The present invention is widely and preferably applicable to a multi-stage press forming machine for forming a material from coarse to fine at a plurality of stations.

[Brief description of the drawings]

FIG. 1 is a front view of the vicinity of a material transfer chuck of a multi-stage press forming machine according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part taken along line YY of FIG.

FIG. 3 is a bottom view of a main part around the blank supporter.

FIG. 4 is a cross-sectional view of a main part around an auxiliary driving mechanism taken along line ZZ in FIG. 1;

FIG. 5 is a process diagram from the third station to the fourth station of the multi-stage press forming machine.

FIG. 6 is a schematic plan sectional view of a main part of another embodiment of a support member.

FIG. 7 is a schematic plan sectional view of a main part of still another embodiment of the support member.

FIG. 8 is a front view of the vicinity of a material transfer chuck of a multi-stage press forming machine according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Multi-stage press-forming machine 4 Die 10 Chuck block (mounting member) 11 Material transfer chuck (chuck) 12 Chuck claw 13 Support shaft (fulcrum) 14 Cam mechanism 15 Chuck opening / closing shaft 46 Support member 50 Auxiliary drive mechanism

Claims (5)

[Claims] 1. A plurality of dies arranged side by side on a machine base, a plurality of punches provided on a ram which advances and retreats toward these dies, and a plurality of punches opposed to the respective dies. A knock mechanism for extruding the material from the inside, a plurality of chucks attached to a mounting member reciprocating in the direction in which the dies are arranged in parallel and reciprocating between adjacent dies, and a cam mechanism by rotating a chuck opening / closing shaft extending in the direction in which the dies are arranged in parallel. And a chuck opening / closing mechanism that closes the chucks in front of the upper die and opens the chuck in front of the lower die, the lowermost chuck in the mounting member. A support member disposed in the vicinity of the mounting position of the chuck, the tip of which is movable between an operating position in front of the material gripping portion of the chuck and a retracted position on the side thereof; Chuck And a drive mechanism for moving the chuck to the retracted position after the chuck is moved to the front position of the lower die when it is at the front position of the upper die. Multi-stage press forming machine. 2. The multi-stage press forming machine according to claim 1, wherein the drive mechanism is configured to operate by rotation of a chuck opening / closing shaft. 3. A support member is provided with a fulcrum of one of the chuck claws at a mounting position of a spare chuck provided at a lower stage side of the lowermost chuck mounting position of the mounting member and at the same interval as the juxtaposed intervals of the chucks. And a drive mechanism for opening and closing the preliminary chuck, the drive mechanism being configured to operate via a cam mechanism by rotation of a chuck open / close shaft. The multi-stage press forming machine according to claim 2, wherein: 4. The apparatus according to claim 1, further comprising an auxiliary driving mechanism for displacing a tip portion of the support member toward the die immediately before the support member moves from the operation position to the retracted position. 3. The multi-stage press forming machine according to any one of 3. 5. The multi-stage press forming machine according to claim 4, wherein the auxiliary drive mechanism is configured to operate by rotation of a chuck opening / closing shaft.