JPH0122045B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a wire rod supply system for a hot former that forms bolts, nuts, and other various parts through multiple stages of hot forging from rough to fine. In particular, the present invention relates to a wire supply system from a wire bundle wound into a coil.

(Prior Art) In general, this type of former has a supply roll that intermittently supplies wire rods into the machine in fixed size portions, and a cutter that operates in synchronization with the rolls to cut the supplied wire rods into fixed size pieces. It has multiple sets of dies and punches that are paired with each other, and the material cut by the cutter is sequentially fed between each set of dies and punches to perform multiple stages of heading processing from rough to fine. , which is configured to be formed into a product of a predetermined shape, is connected to a wire supply system for automatically supplying the wire.

However, as this wire rod supply system, there are two types of wire rod supply systems:
There are types that use wire rods wound into a coil shape (coil material), and types for cold forming machines that perform cold heading processing, and types for hot forming machines that perform the forging process hotly. There is. Among these, a wire rod supply system for a hot homer using bar material is shown, for example, in Japanese Patent Laid-Open No. 54-45672. A heating furnace C is arranged behind the supplied supply rolls B, B, and a large number of bar materials D...
. . . It has a structure in which a pedestal E is arranged which has the function of supporting D and feeding out the bar material one by one, and the bar material D fed from the pedestal E is transferred to the heating furnace C.
After being heated to a predetermined temperature (decarburization temperature), it is intermittently fed into the former A by supply rolls B, B of a fixed size at a time.

Furthermore, for example, Japanese Utility Model Application Publication No. 58-189047 discloses a wire feeding device that supports a coil material on a rack, pulls it out from one end, and feeds it out while correcting it in a straight line. If used in place of the pedestal E in the bar material supply system shown in Fig. 1, a wire supply system for a hot former using coil material will be constructed.

(Problems to be Solved by the Invention) By the way, since the total length of one bundle of coil material is longer than the total length of bar material, the cost per unit length is low, and since it can be bundled compactly,
It has the advantage of being easy to transport and handle, but
When using this as a wire for hot forming,
The following problems arise.

In other words, when producing a wide variety of products in small quantities, there are cases where one bundle of coil material is not used up to manufacture one type of product, and in this case, the wire drawn from the wire bundle is only used to form a predetermined number of products. When the wire rod is fed to the former and cut by the cutters of the former, feeding is stopped, and at this time, the unused wire rod is stopped after the unused end passes through the heating furnace. Therefore, when manufacturing the next type of product, after replacing each die and punch in the former, when feeding the wire again from the above-mentioned terminal section, this terminal section has already cooled down, so that heading processing is not possible. This cannot be done and will also damage the dice and punches. A possible solution to this problem is to rewind a predetermined amount of unused wire to the coil side before starting production of the next product, pass the end of the wire through the heating furnace again, and then supply it to the former. In this case, the terminal part is heated twice to the decarburization temperature range, which weakens the structure, making it difficult to perform forging or subsequent heat treatment, and resulting in deterioration of product quality. A problem occurs.

In addition, such problems occur not only when changing the type of product to a different one in the middle of a bundle of coil material, but also when the homing machine stops for some reason and work is interrupted. . Therefore, at the end of work due to product changes or when work is interrupted for some reason, unused wire, including the coiled part, must be removed before the next work begins. The device must be removed from the supply system, its heated end section must be cut off, and then placed back into the supply system. However, since such work is extremely troublesome and results in a significant loss of working time, conventionally, coil material has not been used as the wire material for hot forming machines.

The present invention addresses the above-mentioned conventional situation, and makes it possible to use coil material as a wire material for hot forming machines without requiring troublesome work at the end of work or when work is interrupted. purpose.

(Means for Solving the Problems) A wire rod supply system for a hot former according to the present invention is characterized in that it is configured as follows to achieve the above object.

Specifically, there is a support device that supports a coiled wire so that it can be pulled out from one end, a straightening device that straightens the wire pulled out from the support device, and a straightening device that straightens the wire that has been pulled out from the support device. It has a feeding device that intermittently feeds the wire by a fixed size in synchronization with the supply roll, and a heating device that heats the wire fed from the feeding device to a decarburization temperature range, and the wire heated by the device is transferred to the former. The system configured to supply wire rods is characterized in that a cutting device is provided between the feeding device and the heating device to cut the wire at the end of the work or when the work is interrupted.
The cutting device preferably operates in synchronization with the feeding device when cutting the wire, so as to perform the cutting operation during a stop period during the intermittent feeding operation of the feeding device, or to operate in synchronization with the feeding device to perform the cutting operation while the feeding device is moving the wire. Therefore, it is configured to perform the cutting operation while moving. Further, the support device is provided with a rewinding mechanism that rewinds the wire sent out from the device into a coil shape, if necessary. The above-mentioned feeding device may be driven by a dedicated drive means synchronized with the supply roll of the former, or may be driven by the above-mentioned supply roll drive device via an interlocking member, or may be driven intermittently. It can also be driven by a digital servo motor that can rotate.

(Function) According to the above configuration, when changing from one type of product to the next type of product while using a bundle of coil material, when the work is once finished, the number of pieces planned to be manufactured for the first product is changed. When the wire rod of the corresponding length is fed out from the feeding device, the cutting device cuts the wire rod, and if the feeding device is stopped, the wire rod is cut at the time when the wire rod of the above number is fed to the former. supply will be stopped. At this time, the unused wire is kept on standby in front of the heating device, so when the next product is to be manufactured, the wire is heated from the terminal end to the required temperature by the heating device and then supplied to the forming machine. This means that if this terminal part is heated twice, it will not burn. In addition, if the cutting device is operated during the stop period during the intermittent feeding operation of the feeding device, or if it is operated while moving according to the movement of the wire by the feeding device, the wire can be cut without stopping the feeding device. Can be cut.

In addition, if the forging work in the former is unexpectedly interrupted for some reason, if the end of the wire that has passed through the cutting device and is fed to the heating device or the former is cut off by the cutting device, the wire will be ready when the work is resumed. will be heated from the unheated end and then supplied to the former. Particularly in this case, if the support device for the coil material is equipped with a rewinding mechanism, when the wire material is cut by the cutting device, the wire material passes through the cutting device and is supplied to the heating device or the former. It is possible to unwind and cut the portion of the end portion that has not been heated to the decarburization temperature range, thereby making it possible to reduce the length of the portion to be cut to the minimum necessary length.

(Example) Examples of the present invention will be described below.

As shown in FIGS. 1 and 2, the wire rod supply system connected to the hot former 1 according to this embodiment basically includes a coil support device 10 and a feeding device 30.
and a heating device 60 are arranged in a line, and the wire is supplied from the support device 10 to the hot former 1 via the feeding device 30 and the heating device 60.

The coil material support device 10 includes a lifting table 13 supported via a lifting mechanism 12 operated by a cylinder 11, and a lifting table 13 placed on the lifting table 13 and rotatably driven by a drive device 14 and located at the center of the upper surface. It has a rotary support table 15 on which a cylindrical body 15a projects and supports a coiled wire bundle X, and a feeding table 16 that feeds out the wire rod X from the wire rod bundle X on the support table 15. This feeding table 16 has brackets 17,1
It is supported by a support shaft 18 attached to the rear surface of the machine base 31 in the feeding device 30 through the support shaft 7, and is swung in the direction a from the extended position above the support base 15 shown in FIG. It is movable so as not to impede loading of the wire bundle X onto the support stand 15, and is fixed by cylinders 19, 19 at the above-mentioned feeding position. The feeding table 16 includes a pair of feeding rolls 20a, 20a, a cylinder 20b that brings both rolls close together to sandwich the wire rod x pulled out from the wire bundle X, and both rolls 20a, 20a.
A feed-out mechanism 20 is provided with a motor 20c that rotates and feeds out the clamped wire rod x forward, and in front of the motor 20c, motors 20c and 20c are arranged in a staggered manner on both sides of the path through which the wire rod x is fed out. A wire straightening mechanism 21 is provided which includes a plurality of straightening rolls 21a...21a and cylinders 21b...21b for tightening the wire from both sides with these rolls. Here, the above-mentioned feeding mechanism 20
The motor 20c is capable of reversing so that it can rewind the wire x into a coil.

Further, the above-mentioned feeding device 30 has two sets of feeding rolls 32 .
and a first and a second on the support device 10 side.
The structure includes correction parts 33 and 34. Among these correction parts 33 and 34, the first correction part 33
has a structure in which a plurality of straightening rolls 33a...33a are arranged in a staggered manner, sandwiching the passage of the wire x in a horizontal plane, and the second straightening part 34 also has a passage of the wire x in the vertical plane A plurality of straightening rolls 34a...34a are arranged in a staggered manner with the two straightening rolls 34a in between. And these straightening rolls 33
The positions of a...33a, 34a...34a are adjustable according to the thickness of the wire x.

On the other hand, as shown in an enlarged view in FIG.
A driven gear 36...36 that rotates integrally with each of these rolls is fixed to the roller, and a pair of upper and lower gears 36 ₁ and 36 ₂ are meshed with each other.
One drive gear 37 is simultaneously meshed with the two gears 36 ₂ and 36 ₂ located below. Then, the motor 38 connects each feed roll 32 via the drive gear 37 and each driven gear 36...36.
. . . A feed roll drive mechanism 39 that rotates the rollers 32 intermittently is provided. This drive mechanism 39 includes a cam 40 fixed to the rotating shaft 38a of the motor 38 and having a bulge 40a on its circumferential surface, and a base end connected to the drive gear 37 via a one-way clutch 41. A roller 43 is provided at the tip and is biased in a predetermined direction by a spring 42.
is the swinging arm 4 that is in contact with the circumferential surface of the cam 40.
It consists of 4. Then, the motor 38
When the cam 40 is rotated in direction b by
When the arm 44 is swung in the c direction, the drive gear 37 is rotated in the e direction via the one-way clutch 41, and each of the driven gears 36...36 to the feed roll 32 ……
... 32 are simultaneously rotated by a certain amount in the f direction, that is, in the feeding direction of the wire x, and when the arm 44 swings in the d direction, the one-way clutch 41 idles, causing the drive gear 37 or the feed roll 32... ....32 is being stopped. Here, the two feed rolls 3 located above
2 and 32 and the driven gears 36 ₁ and 36 ₁ are each connected to a bearing member 4 that is movable up and down.
5, 45, and cylinders 46, 46 for raising and lowering the bearing members 45, 45 are provided, and when the bearing members 45, 45 are raised by the cylinders 46...46, each pair of upper and lower feed At the same time as the rolls 32, 32 are separated, the upper and lower driven gears 36 ₁ , 36 ₂ are disengaged. Note that a ratchet mechanism may be used in place of the one-way clutch 41 as a mechanism for intermittently rotating the drive gear 37 by the reciprocating swing of the swing arm 44.

A cutting device 47 is provided on the end surface of the machine base 31 of this feeding device 30 on the former 1 side. This cutting device 47 consists of a fixed blade 48 fixed above the wire passage path, and a movable blade 49 disposed below the fixed blade 49 so as to be movable up and down. A movable blade drive mechanism 50 that cuts the wire x between the wire rod 48 and the wire rod 48 is provided. This drive mechanism 50 includes the feed roll 3
A cam 53 rotated by a drive motor 38 of 2...32 via a pair of transmission gears 51 and 52.
and a lever 55, one end of which is connected to the lower end of the movable blade 49, and a roller 54 provided at the other end that is in contact with the circumferential surface of the cam 53. When the bulging portion 53a of the cam 53 pushes down the roller 54, the lever 55 swings in the g direction around the central support shaft 56, thereby driving the movable blade 49 upward. However, the above cam 5
3 and a transmission gear 52 concentric therewith, a clutch 57 is interposed so that the cam 53 rotates and the lever 55 or movable blade 49 is driven only when the clutch 57 is connected. It's summery. In that case, the clutch 57 is connected to the cam 53 and the gear 52.
In other words, the connection is made only when the cam 53 and the intermittent driving cam 40 of the feed rolls 32...32 have a predetermined positional relationship. In other words, the feed roll driving cam 4
0 is arm 44 or feed roll 32...32
While stopping the cutting device drive cam 53
is adapted to drive the lever 55 or the movable blade 49.

The heating device 60 is a known high-frequency heating device, and is designed to heat the wire x passing through the heating sections 61, 61 to a decarburization temperature range.

Further, the hot former 1 is also a known one, and includes a pair of supply rolls 2, 2 that take the wire x sent out from the heating device 60 into the machine in fixed size portions.
and a cutter 3 that cuts this wire material x into a certain size.
A plurality of sets of dies and punches are provided to sequentially press the cut wire rod (raw material) x' from coarse to fine.

Next, the operation of the above embodiment will be explained.

First, before starting the forging work, the support device 1 is
A wire bundle X wound into a coil is placed on the rotation support stand 15 at 0, and its end is held between a pair of payout rolls 20a, 20a provided on the payout table 16 of the device 10. While being fed forward by the motor 20c, a plurality of straightening rolls 2
1a......21a and sent out to the feeding device 30 side. Then, the fed-out wire rod x is transferred to the first and second straightening sections 33 and
Each of the plurality of straightening rolls 33a in 34...3
3a, 34a...After passing between 34a, 2
It is held between the set of feed rolls 32, 32, and then pulled out further forward, passed through the heating device 60, and held between the supply rolls 2, 2 of the former 1.

After the preparation is completed in this way, when the former 1 is operated and the motor 38 of the feeding device 30 is operated, the feeding roll driving cam 40 fixed to the rotating shaft 38a of the motor 38 is activated. The swinging arm 44 is rotated to swing in directions c and d, and when the arm 44 swings in direction c, two driven gears 36 ₂ , 36 ₂ are positioned below via the drive gear 37. and two driven gears 36 ₁ located above meshed with these gears,
36 ₁ are each rotated by a certain amount in the f direction at the same time,
Along with this, the two sets of feed rolls 32...32 are also rotationally driven by a certain amount in the f direction. As a result, the wire rod x held by these feed rolls 32...32 is transferred forward by a certain distance. At this time, the pair of supply rolls 2, 2 in the former 1 are also rotated by a certain amount, and the wire x is introduced into the former 1 by the length transferred by the feed rolls 32...32.

In this way, the pair of supply rolls 2, 2 in the former 1 and the two sets of feed rolls 32 in the feed device 30 operate synchronously, so that the wire rod bundle X in the support device 10 is The drawn wire rod x is intermittently supplied to the former 1 side in fixed size portions, and during this time the wire rod
By passing through the first and second straightening sections 33 and 34 at 0, the curve is straightened and made straight, and by passing through the heating device 60, it is heated to a required decarburization temperature range. Then, after being heated in this way, the homa 1
The wire rod x supplied to the former is cut by the cutter 3 in the former 1, and is sequentially forged from rough to fine by a plurality of sets of dies and punches, and is formed into a product of a predetermined shape.

In addition, in the normal molding work as described above,
The motor 20c of the feeding mechanism 20 in the support device 10 is connected to the supply rolls 2, 2 and the feed roll 32.
Although it may be rotated intermittently in synchronization with . . . 32, it may also be stopped and rotated freely. Moreover, in the support device 10,
As the wire rod x is drawn out from the wire bundle X, the rotary support table 15 rotates, and as the height of the wire rod bundle X decreases, the elevating table 13 and the rotary support table 15 are raised by the elevating mechanism 12.

However, there are cases where the type of product to be molded in the former 1 is changed before the wire bundle X placed on the rotary support table 15 of the support device 10 is used up. If the wire rod x having a length corresponding to the number of products to be produced passes through the cutting device 47 in the feeding device 30, the wire rod x is cut by the cutting device 47, and the work is once completed when the above number of products is obtained. It turns out. In other words, the third
When the clutch 57 in the drive mechanism 50 of the cutting device 47 shown in the figure is connected, the rotation of the motor 38 rotates the cam 53 via the pair of transmission gears 51 and 52, and the lever 55 is swung in the g direction. As a result, the movable blade 49 in the cutting device 47 is moved upward, whereby the wire x is cut by the movable blade 49 and the fixed blade 48. Then, as shown in FIG. 4, the front part x ₁ of the cut wire rod x is supplied to the former ₁ and processed into a product, and when the processing of the part is stopped, the production is once completed, and in this way a predetermined number of products can be obtained. At this time, after cutting the wire x in the feeding device 30, the feeding operation of the portion _x2 behind it is stopped.

Then, in order to manufacture the next type of product, after replacing the die and punch in the former 1, if the former 1 and the feeding device 30 are operated again,
The rear part of the wire x cut as above
x ₂ is supplied from its terminal to the former 1 to start manufacturing the next product. In this case, the wires x and x ₂ are supplied after passing through the heating device 60, so the former is The hot forging in step 1 will be performed satisfactorily. In other words, if the operation is stopped with wire rod x cut by cutter 3 of homer 1 when changing the type of product, the supply of wire rod x will be resumed when manufacturing of the next product is started because the end portion of the wire rod is already cold. If the wire material x cannot be processed and the wire material x is once unwound and passed through the heating device 60 again before being supplied, the end portion of the wire material x will be heated twice and the tissue will be damaged. However, if the wire x is cut by the cutting device 47 provided in the feeding device 30 as described above, the above-mentioned problems will not occur.

In addition to the above-mentioned changes in product types,
Homer 1 may stop for some reason.
In this case as well, if the wire x that has already been fed to the front of the cutter 3 of the former 1 is fed as it is when work is restarted, the end portion of the wire will be completely cold and cannot be processed as required. Therefore, in this case, when the operation of the homer 1 is interrupted, the feeder 3
By activating the cutting device 47 at 0 to cut the wire rod x, and removing the front part from the cutting position, and restarting the supply from the cut rear part when restarting the work, the wire rod x
will be supplied from its terminal portion through the heating device 60, and the required hot heading will be performed. In that case, the portion cut off by the cutting device 47 is wasted, but in order to minimize the waste, as shown in FIG.
Among the terminal parts of the wire rod x that were being supplied to the former 1 side beyond the cutting device 47 at the time when the work was interrupted,
It is sufficient to cut off only the portion _x3 that has been heated to the decarburization temperature range by the heating device 60. In other words, when work is interrupted or when work is resumed,
The motor 20c in the feeding mechanism 20 of the support device 10 is reversed, and among the end portions of the wire rods that are supplied to the forming machine 1 side beyond the cutting device 47, the portions excluding the portion x ₃ heated to the above decarburization temperature range If the wire x is rewound until x ₄ is located behind the cutting device 47 (on the side of the support device 10) and then the wire x is cut, the above decarburization temperature is reached at which it cannot be heated again and used. Only the portion _x3 that has been heated to a certain temperature is cut off, and the waste of the wire x during such work interruptions is minimized.

In addition, in the above embodiment, the feed roll 32...3
The swing arm 4 is rotated by the motor 38 that continuously rotates the swing arm 2.
4 or a one-way clutch 41 (or a ratchet mechanism), etc. However, if a digital servo motor that rotates intermittently by a constant rotation amount is used, the drive mechanism 39 as described above is unnecessary. Become. In this case, the drive gear 37 shown in FIG. 3 will be directly driven by the digital servo motor, and
7, a transmission gear 52 in the cutting device drive mechanism 50;
When engaged, the cutting device 47 can be operated by the digital servo motor via the clutch 57. In addition, the feed roll 32...
... 32 to the cutting device 47 can be operated in conjunction with the supply rolls 2, 2 by using the drive source of the supply rolls 2, 2 in the former 1. In other words, it is sufficient to provide an interlocking member that is reciprocated by a crank mechanism that drives the supply rolls 2, 2, and to drive the swinging arm 44 shown in FIG. 3 by this interlocking member.
The cutting device 47 can be operated by meshing the transmission gear 52 with the transmission gear 52.

(Effects of the Invention) As described above, according to the present invention, in the wire rod supply system of a hot former, a cutting device is provided between the heating device and the feeding device to cut the wire rod at the end of work or at the time of interruption. Therefore, when changing the type of product before a bundle of wire is used up, or when the former stops for some reason, when work is restarted, the wire is heated from its terminal end to the required temperature using a heating device. It becomes possible to heat it up to a certain temperature and then supply it to the homa. This eliminates the trouble of previously having to take the wire out of the supply system, cut off the part that passed through the heating device, and then set it back up again. It becomes possible to use a coiled material as the wire, which reduces cost or improves efficiency.

[Brief explanation of drawings]

Figures 1 to 5 show embodiments of the present invention; Figure 1 is a plan view of the entire wire supply system, Figure 2 is a front view of the same, and Figure 3 is a drive mechanism for the feeding device and cutting device. The enlarged front view and FIGS. 4 and 5 are schematic front views of main parts showing examples of use of the cutting device, respectively. Also,
FIG. 6 is a schematic front view showing a wire rod supply system for a hot former using conventional bar material. 1...Hot former, 2...Supply roll, 3...
Cutter, 10... Support device, 20... Rewinding mechanism (feeding mechanism), 21... Correction device (correction mechanism), 30... Feeding device, 47... Cutting device, 6
0... Heating device.

Claims (1)

[Scope of Claims] 1. A hot press having a cutter for cutting a wire rod supplied from the outside into a predetermined size, and a plurality of sets of dies and punches for hot pressing forming a material obtained by cutting the wire rod with the cutter. A wire supply system connected to a former, comprising a support device that supports a coiled wire on a rack so that it can be pulled out from one end, and a support device that straightens the wire pulled out from the support device. The present invention comprises a straightening device, a feeding device that intermittently feeds the straightened wire rod by a fixed size in synchronization with the supply rolls in the former, and a heating device that heats the wire fed from the feeding device to a decarburization temperature range. A heating device configured to supply a heated wire to a former, and further comprising a cutting device between the feeding device and the heating device that cuts the wire at the end of or during interruption of the former. Wire supply system for intermediate homa. 2. A wire rod supply system for a hot former according to claim 1, wherein the feeding device is intermittently driven by a digital servo motor. 3. The wire rod supply system for a hot former according to claim 1, wherein the feeding device is driven by a driving device for supply rolls in the former via an interlocking member. 4. The cutting device operates in synchronization with the feeding device when cutting the wire, and is configured to perform the cutting operation during the stop period during the intermittent feeding operation of the feeding device. A wire supply system for a hot former according to item 1 or 3. 5. The wire rod supply system for a hot former according to claim 1, wherein the support device has a rewinding mechanism that rewinds the wire fed from the device into a coil shape.