JP2785660B2 - Work cooling equipment in forging equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forging facility for processing a workpiece such as various mechanical parts while heating the workpiece, and comprises a cooling conveyor for cooling while transporting the processed high-temperature workpiece. The present invention relates to a work cooling device in a forging facility.

[0002]

2. Description of the Related Art In a hot forging facility, a workpiece heated to a high temperature is processed by a forging machine, and then, if necessary, a heat treatment or the like is performed. For example, if the material of the work is SC
In the case of conventional steel such as steel, heat treatment such as quenching and tempering is performed. Then, desired machining such as cutting has been performed on the workpiece after the heat treatment.

[0003] In the case of non-heat treated steel for hot forging, which the present inventors are paying attention to, after so-called impingement cooling is performed until the temperature becomes 500 ° C or less after hot forging, cutting is performed. Processing is performed. In the impingement cooling, the work is conveyed at a constant speed while being placed on a conveyor, and is exposed to wind in a cooling zone to perform air cooling to a predetermined temperature at a constant cooling speed. Therefore, it is desired that the conveyor used in such an application not only has a function of transporting the work but also considers the cooling speed and the temperature distribution of the work at the time of the blast cooling.

[0004] As a transfer means for transferring a work,
Conventionally, a slat conveyor has been known. Conveyor body 101 of conventional slat conveyor 100 shown in FIG.
Is a pair of left and right endless chains 102 (only one is shown),
It is composed of a large number of slat plates 103 provided between the pair of chains 102. The chain 102 runs along a pair of left and right guide rails provided on a conveyor frame (not shown). chain
Reference numeral 102 denotes a plurality of links 105 rotatably connected by pins 106, and includes a roller 107 that rotates about the pins 106. The slat plate 103 is attached to the link 105.

In the case of a slat conveyor 100 for transporting a hot work W subjected to hot working, a slat plate 10
Numeral 3 is made of a metal having heat resistance, and a slat plate 103 having a considerably large thickness is employed to withstand the weight of the work W. Then, the work W is conveyed to the cooling zone with the work W placed on the slat plate 103, whereby the work W is cooled.

[0006]

In the conventional slat conveyor 100, there is a difference in elevation in the transport path from the transport start end to the transport end, as in a so-called overhead type conveyor, so that the slat plate 103 moves horizontally. If there is a part that moves diagonally upward, the slat plate 10
Since there is a place where the moving route 3 is curved in the vertical direction, there may be a large gap between adjacent portions of the slat plates 103 adjacent to each other in the front and rear. For example, in FIG. 9, when the slat plate 103 moves in the direction of arrow A, a large gap 110 is formed in the adjacent portion of the slat plate 103. This gap 110 is
The greater the thickness of 103, the more noticeable.

Further, assuming that the slat plate 103 moves in the direction of arrow B (bends to the outside of the conveyor), in order to prevent adjacent portions of the slat plate 103 adjacent to each other in front and back from interfering with each other, the clearance is required. 110 needs to be set somewhat wide.

For this reason, in the conventional slat conveyor 100, when the blast cooling is performed while the work W is being conveyed, the air flows from the periphery of the slat plate 103 in the cooling zone to blow through the slat plate 103. In some cases, the air flow passing through the gap 110 directly hits the work W, causing the temperature of the work surface to be excessively reduced locally, resulting in uneven temperature or an excessively high cooling rate. When the cooling rate changes for such a reason, there are cases where the mechanical properties of the work W, for example, various properties such as tensile strength, proof stress and impact value are adversely affected.

Also, if there is a large gap 110 adjacent to the slat plate 103, the work W may bite into the gap 110, causing the conveyor 100 to stop or the work W not being able to be carried properly. Cause.

Accordingly, an object of the present invention is to uniformly cool a work at a predetermined cooling rate when carrying out a blast cooling while conveying a high-temperature work, and to prevent the work from being caught in the slat plate. Another object of the present invention is to provide a simple work cooling device.

[0011]

SUMMARY OF THE INVENTION A work cooling device according to the present invention, which has been developed to achieve the above object, comprises a discharge conveyor for receiving a high-temperature work processed by a forging machine, and a transfer end side of the discharge conveyor. A distributing mechanism that is provided and alternately sorts and drops a plurality of workpieces sequentially sent from the unloading conveyor in the width direction of the conveyer by neighboring ones before and after, and a metal on which the workpieces sorted by the distributing mechanism are placed. A cooling conveyor having a slat plate and a part in which the slat plate moves horizontally and a part that moves diagonally upward in the middle of the transport path,
A cooling zone that is provided in the middle of the conveying path of the cooling conveyor and that takes in air for cooling the work from around the cooling conveyor onto the conveyor and performs blast cooling of the work; and The conveyor has a pair of left and right endless chains rotatably connecting a plurality of links by pins, and a plurality of slat plates provided between the links of the pair of endless chains. The transport surface is provided at a height such that it is located near a line segment connecting the centers of the pins, and at least one of the adjacent portions of the slat plates adjacent to each other before and after the slat plate is provided with the slat plate. An escape portion is provided to avoid interference between the slat plates when rotating about the pin.

[0012]

The high-temperature work taken out of the forging machine by the unloading conveyor is transferred to the slat plate of the cooling conveyor via the distribution mechanism. The work is guided to a cooling zone by a cooling conveyor, and is subjected to blast cooling to a predetermined temperature at a predetermined cooling rate in the cooling zone. In this cooling conveyor, each link of the chain rotates around the pin, and each slat plate rotates around the pin in the same direction as the link, for example, in a portion where the movement path of the slat plate curves vertically. I do.

For example, at a position where the movement path of the slat plate bends inside the conveyor, the slat plate rotates in a direction in which the escape portions of the slat plates adjacent to each other narrow. Conversely, where the slat plate bends outward from the conveyor, each slat plate rotates in a direction in which the opening angle of the escape portion increases. In any of the above cases, the gap between adjacent portions of the slat plate does not expand.

As described above, since it is possible to prevent the gap between the adjacent portions of the slat plate from spreading over the entire length of the movement path of the slat plate, the work on the slat plate is gradually and gradually cooled at a stable cooling rate in the cooling zone. Therefore, problems such as unevenness in the surface temperature of the work and an excessively high cooling rate can be avoided.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The hot forging equipment 1 shown in FIG. 1 includes a forging machine 2 for stamping a heated workpiece W (shown in FIG. 2 and the like) and a forging machine 2 for processing a hot workpiece W after processing.
Unloading conveyor 4 for unloading from the final processing unit 3, a work distribution mechanism 5 provided on the transport end side of the unloading conveyor 4, and the work W received from the distribution mechanism 5 is transported to the transport end via the cooling unit 6. Cooling conveyor 10
And a work accommodating section 11 provided at the transport end of the cooling conveyor 10. A container 12 is placed at a predetermined position of the work storage unit 11.

An example of the work W is a drive system part for an automobile made of non-heat treated steel for hot forging, but other heat treatable metal parts may be used. An example of the components contained in the non-heat treated steel for hot forging is as follows: C: 0.31 to 0.34%, S
i: 0.20 to 0.35%, Mn: 1.40 to 1.60
%, The balance being appropriate amounts of P, S, V, Ti, Pb, N and the like.

As shown in FIGS. 2 and 3, the unloading conveyor 4 has a large number of heat-resistant metal slat plates 16 arranged horizontally along the conveyor frame 15. The hot work W taken out of the forging machine 2 can be placed on the work 16. A drive chain 18 is provided inside the slat plate 16. The chain 18 is wound around a chain wheel 22 provided on a shaft 21a of a sprocket 21 which is rotated by a motor 20. The chain 1 is rotated by rotating the sprocket 21.
By driving the slat 8, the slat plate 16 continuously runs endlessly in the direction of arrow F1 in FIG. The tension of the chain 18 is maintained at an appropriate tension by a tensioner 23.

The distribution mechanism 5 is located below the transport end of the unloading conveyor 4. This distribution mechanism 5 is shown in FIGS.
, A pair of front and rear guide members 27 and 28 extending horizontally in the width direction of the unloading conveyor 4,
A movable hopper 30 that travels along the directions 7 and 28 and an actuator 31 that moves the movable hopper 30 in the above-described direction are provided. The guide members 27 and 28 are provided on the base frame 32. Wheels 36 are provided on a base frame 35 of the movable hopper 30. The wheel 36 is the guide member 3
7, 38. FIG. 4 shows the movable hopper 30.
Are viewed from above, and drop guide plates 38a, 38b, 38c are provided on three sides around the work discharge port 37.

As shown in FIG.
Reference numeral 1 denotes two fluid pressure cylinders 41 and 42 connected in parallel, and rods 43 and 4 of each cylinder 41 and 42 are connected.
4 project in opposite directions. When both rods 43 and 44 move to the extension side, the movable hopper 30 is located at the first position shown in FIG. 3, and when only one rod 43 moves to the contraction side, the movable hopper 30 is moved to the base frame. The movable hopper 30 is located at a third position which is shifted to the right side in FIG. 3 when both rods 43 and 44 are moved to the contraction side. ing. Therefore, the work W dropped from the unloading conveyor 4 into the movable hopper 30 is sorted on the cooling conveyor 10 according to the three types of positions of the movable hopper 30.

As shown in FIG. 5, the cooling conveyor 10
Has a pair of left and right roller rails 51 and 52 provided on a conveyor frame 50 and a conveyor body 53 running along the roller rails 51 and 52. The conveyor body 53 includes a pair of left and right endless chains 55, 56.
, And a number of slat plates 57 laid parallel to each other in a direction crossing the chains 55 and 56.
The slat plate 57 is made of a metal having heat resistance, and the upper surface thereof is a transfer surface 58 on which the work W is placed.

Each of the chains 55 and 56 has a plurality of links 61 rotatably connected by pins 62, and has rollers 63 that rotate about the pins 62. Each roller 63 comes into contact with the inner surfaces of the roller rails 51 and 52.

The slat plate 57 is attached to the chain link 61 by a support part 65 and fixing parts 66 such as bolts. The support portion 65 may be formed integrally with a part of the link 61, or may be a component other than the link 61 fixed to the link 61 by an appropriate fixing means such as welding. Some of these slat plates 57 have standing ribs 67 at regular intervals at predetermined pitches.
(Shown in FIG. 8 and the like).

As shown in FIGS.
The slat plate 57 is supported by the support portion 65 such that the height of the transfer surface 58 is substantially the same as the height of the line connecting the centers of the pins 62.
Are held by the link 61. In addition, an escape portion 7 is provided in an adjacent portion 68 of the slat plates 57, 57 which are adjacent to each other in front and rear.
0 is provided. In the case of the illustrated example, the escape portion 70 is created by forming one of the front wall 71 and the rear wall 72 of the adjacent slat plates 57, 57 on the side of the one wall 72 as an inclined surface having a cut-off angle of an angle θ. . The escape portion 70 may be provided on the front wall 71 side of the slat plate 57, or may be provided on both the front wall 71 and the rear wall 72. In addition, the escape portion 70 having a shape other than the inclined surface is used.
It may be.

The angle θ of the escape portion 70 is set so that the slat plates 57 adjacent to each other in the front and rear directions do not interfere with each other even when the rotation angle of the link 61 rotates about the pin 62 even when the rotation angle is maximized. Angle is set. The leading edge and the trailing edge of the transport surface 58 of each slat plate 57 are located near the center line of the pin 62, respectively.

The chains 55 and 56 are made to run continuously and endlessly by a driving mechanism 76 (shown in FIG. 8 and the like) provided with a driving sprocket 75. The driving sprocket 75 is rotated by a motor 77. Guide fences 78 are provided above both sides of the slat plate 57. Reference numeral 79 in the figure is a support member for preventing the slat plate 57 from bending. The tension of the chains 55 and 56 is maintained at an appropriate tension by a chain tensioner 80 capable of adjusting the position of the sprocket 75 in the front-rear direction.

The chain tensioner 80 shown in FIG. 2 includes a movable member 83 movable in a horizontal direction along a guide 82 extending in the front-rear direction, and an adjustment screw 84 connected to the movable member 83. The tension of the chains 55 and 56 can be adjusted by rotating the screw 84 to change the screw advance position.

The cooling conveyer 10 has a layout in which a height difference is provided in a conveyance path from the conveyance start end to the conveyance end. In the case of the illustrated example (FIG. 1), the slat plate 57 is horizontally positioned on the conveyance start end side. A work receiving portion 90 that moves in the direction is provided. The slat plate 57 includes a portion 91 where the slat plate 57 rises obliquely toward the cooling unit 6, and a horizontal portion 92 where the slat plate 57 returns to the horizontal position and passes below the cooling unit 6. Before and after the portion 91, there are portions 93 and 94 where the transport path bends vertically.

The cooling unit 6 is provided with a hood 96 provided over a predetermined length in the conveying path of the cooling conveyor 10 and a wind guide duct 97 provided above the hood 96.
And a blower 98 for sucking the air inside the hood 96, and the like.
The work W is air-cooled by sucking the air taken into the inside of the air supply duct into the air guide duct 97.

Next, the operation of the forging equipment 1 having the above configuration will be described. The workpiece W heated to a high temperature (for example, around 1200 ° C.) is stamped in the final processing section 3 of the forging machine 2 and processed into a predetermined shape by deburring or the like. The processing cycle time per work in the forging machine 2 is, for example, about several tens seconds. The work W after processing is taken out on the carry-out conveyor 4 in a state where the temperature has dropped to about 1000 ° C., and is transferred to the distribution mechanism 5.

The work W dropped into the movable hopper 30 of the distribution mechanism 5 is dropped on the slat plate 57 while being distributed on the cooling conveyor 10 according to the position of the movable hopper 30. Since the works W are distributed in this manner, the works W can be arranged in a state that is preferable for cooling by the cooling unit 6, and, for example, thermal interference between adjacent works is avoided.

The work W supplied onto the cooling conveyor 10 in the work receiving section 90 is sent into the hood 96 of the cooling unit 6 while climbing the obliquely rising portion 91, and the air generated in the cooling zone 6a. By cooling by flow and cooling by heat conduction of the slat plate 57,
The cooling is performed to a predetermined temperature at a predetermined cooling rate (for example, 1 to 3 ° C./sec, preferably 1.4 ° C./sec). By this impingement cooling, for example, the work W whose initial temperature was 1040 ° C. is cooled to around 370 ° C. An example of the cooling time is around 400 seconds to 500 seconds. Work W after cooling
Is cooled down to about room temperature by being stored in the container 12 from the transport end of the cooling conveyor 10 and left in the air.

When the cooling conveyer 10 travels endlessly along the above-described transport path, the chain link 61 rotates about the pin 62 at, for example, points 93 and 94 where the moving path of the slat plate 57 is bent in the vertical direction. I do. Therefore, the slat plates 57 rotate around the pins 62 in the same direction as the link 61 at the adjacent portions 68.

For example, at a position where the moving path of the slat plate 57 bends outside the conveyor 10 (a position where the slat plate 57 turns in the direction of the arrow R1 in FIG. 7), the slat plate 57 rotates in a direction in which the angle θ of the escape portion 70 increases. I do. In this case, pin 6
Since the slat plate 57 is rotated about the adjacent portion 68 located near the center of the slat 2, the gap between the adjacent portions 73 does not expand even if the slat plate 57 has a large thickness.

Contrary to the above, a point where the moving path of the slat plate 57 bends inside the conveyor 10 (arrow R2 in FIG. 7).
Direction), the slat plate 57 rotates in a direction in which the angle θ of the escape portion 70 decreases. Even if the slat plate 57 rotates in this direction, the slat plates 57, 57 do not collide with each other because the escape portion 70 exists between the slat plates 57, 57 adjacent to each other.

As described above, the adjacent portion 6 of the slat plate 57
In order to avoid a large gap or widening of the gap 8 in the cooling zone 6a while conveying the work W, the air flow blows through the gap of the slat plate 57 from below to above. Is suppressed. For this reason, it is possible to prevent problems such as the cooling speed of the work W being too fast and unevenness in the surface temperature of the work W, and it is possible to perform uniform cooling at a constant cooling speed. Therefore, the cooled work W can satisfy required values of mechanical properties such as tensile strength, proof stress, and impact value. Moreover, since the gap between the slat plates 57 does not widen, there is no problem that the work W is bitten between the slat plates 57.

[0036]

According to the present invention, when it is necessary to cool a hot workpiece after hot working while transporting the workpiece, the workpiece can be uniformly blown and cooled at a predetermined cooling rate. Since a large gap is not formed in the slat plate in the middle of the process, it is possible to prevent a problem such as a work or a foreign substance being sandwiched between the slat plates.

[Brief description of the drawings]

FIG. 1 is a front view of a part of a forging facility showing one embodiment of the present invention.

FIG. 2 is a sectional view of a part of an unloading conveyor and a distribution mechanism in the equipment shown in FIG. 1;

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

4 is a plan view of a movable hopper of a distribution mechanism in the equipment shown in FIG.

FIG. 5 is a sectional view of a cooling conveyor in the equipment shown in FIG. 1;

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5;

FIG. 7 is a sectional view taken along the line VII-VII in FIG. 5;

FIG. 8 is a sectional view showing a drive mechanism of the cooling conveyor in the equipment shown in FIG. 1;

FIG. 9 is a cross-sectional view of a conventional slat conveyor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Forging equipment 2 ... Forging machine 4 ... Unloading conveyor 5 ... Distribution mechanism 6 ... Cooling unit 6a ... Cooling zone 10 ... Cooling conveyor 55, 56 ... Chain 57 ... Slat plate 58 ... Transport surface 61 ... Link 62 ... Pin 63 ... Roller 70: escape part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-98417 (JP, A) JP-A-58-157543 (JP, A) JP-A-58-157544 (JP, A) JP-A 64-64 87038 (JP, A) JP-A-2-209419 (JP, A) JP-A-51-68413 (JP, A) JP-A-4-100242 (JP, U) JP-B-54-29413 (JP, B2) (58) Field surveyed (Int.Cl. ⁶ , DB name) B21J 1/06

Claims (1)

(57) [Claims] An unloading conveyor for receiving a high-temperature workpiece processed by a forging machine, and a plurality of workpieces provided at a transport end side of the unloading conveyor and successively sent from the unloading conveyor one behind another. A distributing mechanism for alternately distributing and dropping the position in the width direction of the conveyor, and a metal slat plate on which the work distributed by the distributing mechanism is placed, and a part where the slat plate moves horizontally in the middle of the transport path And a cooling conveyor having a part that moves obliquely upward, and air provided for cooling the work, which is provided in the middle of the conveyance path of the cooling conveyor, is taken in on the conveyor from around the cooling conveyor, and the blast of the work is performed. A cooling zone for cooling, and the cooling conveyer has a pair of left and right pairs of a plurality of links rotatably connected by pins. It has an endless chain and a plurality of the slat plates provided between the links of the pair of endless chains, and the slat plate has a transfer surface positioned near a line segment connecting the centers of the pins. And at least one of the adjacent portions of the slat plates adjacent to each other in order to avoid interference between the slat plates when the slat plates rotate about the pins. A work cooling device in a forging facility, wherein a relief portion is provided.