JPH03120312A - Device for cooling work - Google Patents

Abstract

PURPOSE:To enable quenching treatment to plural works in uniform hardness by using a turn table having plural cooling chambers providing rapid cooling device and work temp. detector at the time of rapidly cooling and quenching the hot forged work while utilizing this holding heat. CONSTITUTION:A work 100 just after hot-forging is conveyed with a conveyor 2 and charged into one chamber in plural cooling chambers 15 arranged on a turn table 10 with a pusher 50. Successively, the turn table 10 is rotated and a casing 31 having plural air nozzles 32 for cooling above the work 100 in the cooling chamber 15 is descended, and the work is rapidly cooled with cold blast from the nozzles 32 and quenched. This operation is executed in plural cooling chambers 15, and temp. of the work 100 is measured with a temp. sensor 40 arranged to the casing 31, and at the time of rapidly cooling this temp. to the prescribed quenching temp., by rotating the turn table 10, the cooling chamber 15 for this work is shifted to a device of guide rails 61 and dropped on a conveyor 3 for carrying out the work through the guide rails 61. All works are quenched under uniform condition to manufacture the works having uniform quality.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a workpiece cooling device, and more particularly to a device for cooling a preheated workpiece to a desired temperature.

[Prior art] For example, in parts forged from carbon steel for machine structures, such as wheel hubs in 2.4-wheel vehicles, residual heat from hot forging is used to improve mechanical strength. In some cases, so-called forging quenching is performed.

FIG. 4 shows a production line for hot forged products configured to carry out the forging and hardening described above.

The workpiece is first heated by an induction heater A, then sent to a hot forging press B, where it is formed into a predetermined shape.

The molded workpiece is conveyed to the cooling tank by the conveyor C, and is put into the quenching liquid d in the cooling ID, whereby the workpiece is forged and hardened.

The workpiece that has been hardened is sent to a tempering furnace E where it is tempered and heated, and then transported to an express tank F.

After being cooled in the express tank F, the workpiece is sent to a shot blasting process (not shown).

[Problem to be solved by the invention] By the way, in the forged product production line configured as described above,
After the forging process, the workpiece is left to cool while being transported on a conveyor, and the temperature of the workpiece is not accurately controlled. For this reason, the temperature of the workpieces immediately before being put into the quenching bath differs from workpiece to workpiece, and as a result, there is an inconvenience that the hardness of the products after quenching varies.

In addition, in the above-mentioned forged product production line, in order to cool thick-walled workpieces to a predetermined temperature, the conveyor speed is set slow, while in order to cool thin-walled workpieces to a predetermined temperature, By setting the conveyance speed of the conveyor to a high speed, the temperature of the workpiece just before it is introduced into the quenching tank is adjusted. For this reason, it is necessary to reset the conveyance speed of the conveyor every time the shape of the workpiece to be produced is changed, and as a result, the conventional production line is not suitable for high-mix, low-volume production.

In view of the above-mentioned circumstances, it is an object of the present invention to provide a workpiece cooling device that can suppress variations in mechanical properties among products and also enables production of a wide variety of products in small numbers.

[Means for Solving the Problem] Therefore, in the present invention, a turntable having a plurality of workpiece cooling chambers around the rotation center is rotatably provided between a workpiece loading path and a workpiece unloading path, and Work loading means for transporting the workpiece from the workpiece transporting path to the workpiece cooling chamber and workpiece unloading means for transporting the workpiece from the workpiece cooling chamber to the workpiece unloading path are provided, and the workpiece is cooled in the workpiece cooling chamber. A forced workpiece cooling means for cooling the workpiece and a temperature sensor for measuring the temperature of the workpiece are provided, and the temperature sensor detects that the workpiece stored in a specific workpiece cooling chamber has been cooled to a predetermined temperature. By providing a control means for rotating the rotary table so as to occupy the specific workpiece cooling chamber at a position corresponding to the workpiece discharge path based on the output signal from the temperature sensor when the temperature sensor detects the temperature sensor. has achieved its purpose.

[Function] According to the above configuration, each workpiece is cooled to a preset temperature before being carried out of the apparatus, so if the workpieces are of the same type, the temperature after cooling will vary from workpiece to workpiece. Moreover, since the plurality of workpieces are cooled independently and separately, even when various types of workpieces are mixed, each workpiece can be cooled to a predetermined temperature.

[Example] Hereinafter, a specific configuration of the present invention will be described in detail based on drawings showing one example.

FIG. 1 shows a work cooling device related to the present invention. This workpiece cooling device was applied to a production line for hot forged products configured to perform forging quenching, and the configuration of the production line itself was similar to that of the conventional production line shown in Figure 2. In place of the conveyor C, the workpiece cooling device described above is installed.

The workpiece cooling device 1 includes a conveyor 2 as a workpiece loading path and a conveyor 3 as a workpiece unloading path, and the device 1 further includes a turntable 10 disposed between both conveyors 23. .

The turntable 10 includes a turntable main body 11 that is driven and rotated by a drive source (not shown), and a top that is located above the turntable main body 11 and is immovably supported by a base of a device (not shown). A wall 12 is provided.

On the turntable 10, a plurality of partition walls 13 extending in the radial direction are erected in a radial manner, while on the lower surface of the top wall 12 there are also partition walls 14 extending in the radial direction.
is formed at a position corresponding to the partition wall 13. The turntable main body 11. Ceiling wall 12. and bulkhead 13
．． 14, a total of four workpiece cooling chambers 15 are defined in the turntable 10. In addition, rails 16 on which the workpieces 100 are placed are laid in the parts of the turntable main body 11 that define the workpiece cooling chambers 15, respectively.

On the other hand, on the top wall 12, there are a cylinder actuator 20 and a guide rod 2, respectively, in a portion sandwiched between the partition walls 14, in other words, inside the workpiece cooling chamber 15.
Work force cooling means 30 is provided via 1.

The workpiece forced cooling means 30 is operated by the turntable main body 1 by the operation of the cylinder actuator 20.
It moves up and down between the raised position where it retreats when rotated in step 1 and the lowered position where it covers the workpiece.

The workpiece forced cooling means 30 cools the rail 1 when the workpiece is lowered by the operation of the cylinder actuator 20.
It has a casing 31 that covers the work 100 on the top 6 from above and from the sides, and a large number of air nozzles 32 are provided on the inner surface of the casing 31. This air nozzle 32 is connected to an air supply source (not shown), and when activated, cooling air is injected.

Furthermore, the casing 31 of the work forced cooling means 30
A temperature sensor (infrared radiation thermometer) 40 is attached to measure the temperature of the workpiece 100 during cooling.

On the other hand, as shown in FIG. 1, a pusher 50 as a workpiece carrying means is installed on the side of the workpiece carrying-in conveyor 2, while a pusher 50 as a workpiece carrying means is installed on the side of the workpiece carrying-out conveyor 3.
A slider 60 and a guide rail 61 are installed as workpiece transport means.

Now, when the work 100 is being conveyed on the conveyor 2, the work 100 is sent onto the turntable main body 11 of the turntable 10 by the pusher 50.

Then, the turntable main body 11 starts rotating,
The workpiece 100 is transferred to an area immediately below the casing 31 in the workpiece forced cooling means 30. Note that when the turntable main body 11 rotates, the work force cooling means 30 is moving upward.

When the workpiece 100 is transferred to the area directly below the casing 31, the casing 31 is lowered and the workpiece 1 (L is turned off), and cooling air is injected from the air nozzle 32 to start cooling the workpiece 100. be done.

On the other hand, when the next workpiece 100 is conveyed on the conveyor 2, this workpiece 100 is first transferred to the bushier 50.
is sent onto the turntable main body 11 of the turntable 10, and then transferred by the turntable main body 11 which starts rotating to an area immediately below the casing 31 in the workpiece forced cooling means 30, and is then covered by the descending casing 31. , and air nozzle 3
It is cooled by cooling air injected from 2.

As described above, the workpieces 100 conveyed on the conveyor 2 are sequentially fed into the empty workpiece cooling chamber 15 of the turntable 10.

The temperature of the workpiece 100 in each workpiece cooling chamber 15 is constantly measured by a temperature sensor 40 provided in the workpiece forced cooling means 30, and an output signal from the temperature sensor 40 is sent to the control device 70.

Now, when the workpiece 100 housed in any of the workpiece cooling chambers 15 is cooled to a predetermined temperature, the control device 70 controls the motor for driving the turntable main body based on the output signal from the temperature sensor 40. 80 (Fig. 3).

The turntable main body 11 starts rotating in response to a command from the control device 70, and the cooled workpiece 100
The rotation is stopped when the workpiece is located at a position corresponding to the workpiece carrying means consisting of the slider 60 and the guide rail 61.

Thereafter, the workpiece 100 is transferred to the conveyor 3 for carrying out the workpiece by the movement of the slider 60, and the workpiece 100 is carried by the conveyor 3 to a quenching tank (not shown).

The above-described workpiece unloading operation is repeatedly performed each time the workpieces 100 accommodated in each workpiece cooling chamber 15 are cooled to a predetermined temperature.

A new workpiece 100 sent by the conveyor 2 for transporting the workpiece is fed into the workpiece cooling chamber 15 which has become empty after the workpiece 100 has been carried out, and is then heated to a predetermined temperature by the above-mentioned procedure. After being cooled down to a temperature of 100.degree. C., the workpiece is transported to a quenching tank (not shown) via a conveyor 3 for transporting the workpiece.

In the above explanation, the operating procedure of the workpiece cooling device equipped with one turntable has been described, but by arranging a plurality of turntables, a large number of workpieces can be efficiently cooled.

That is, when the workpieces are stored in all the workpiece cooling chambers of one turntable, the workpieces are stored in the workpiece cooling chambers of the other turntables for cooling, and the workpieces are cooled from the workpiece cooling chambers of the above-mentioned two turntables. When the workpiece is carried out, the workpiece may be stored in the vacant workpiece cooling chamber. By configuring the cooling of the workpieces on one turntable to end when the workpiece cooling chambers on the other turntables are full, the workpieces that are brought in one after another can be cooled continuously without stagnation. can do.

The number of workpiece cooling chambers in each rotary table can be set as appropriate according to the processing capacity of the production line, etc., and the number of rotary tables installed in the production line can be adjusted depending on the target This is determined as appropriate depending on various conditions such as the type of workpiece to be used and the cooling capacity of the workpiece cooling device.

Furthermore, the workpiece cooling device according to the present invention is not only applicable to forged product production lines, but is also used, for example, in heat treatment equipment for producing non-tempered steel, etc., in which preheated workpieces are cooled to a predetermined temperature. Needless to say, it can be widely used as a cooling device.

[Effects of the Invention] As detailed above, in the workpiece cooling device according to the present invention, the turntable having a plurality of workpiece cooling chambers around the rotation center can be rotated between the workpiece loading path and the workpiece unloading path. and a workpiece carrying-in means for feeding the workpiece from the workpiece carrying-in path to the workpiece cooling chamber, and a workpiece carrying-out means for sending the workpiece from the workpiece cooling chamber to the workpiece carrying-out path, and in the workpiece cooling chamber, A workpiece forced cooling means for cooling the workpiece and a temperature sensor for measuring the temperature of the workpiece are provided, and the above-mentioned method is provided to detect that the workpiece stored in a specific workpiece cooling chamber has been cooled to a predetermined temperature. A control means is provided for rotating the rotary table so as to position the specific workpiece cooling chamber at a position corresponding to the workpiece discharge path based on the output signal from the temperature sensor when the temperature sensor detects the temperature. There is.

Therefore, each workpiece is cooled to a preset temperature before being taken out of the equipment, so if the workpieces are of the same type, there will be no variation in the cooling temperature for each workpiece. . As a result, for example, when forging and hardening is performed, the hardening hardness of each workpiece becomes almost constant, and variations in mechanical properties of each product can be suppressed. Since each workpiece is cooled independently and separately, even when various types of workpieces are mixed, each workpiece can be cooled to a predetermined temperature. As a result, it becomes possible to produce a wide variety of products in small quantities.

FIG. 1 is an overall plan view of a work cooling device related to the present invention;
FIG. 2 is a cross-sectional view taken along the line ■--■ in FIG. 1, FIG. 3 is a conceptual diagram of a control circuit, and FIG. 4 is a conceptual overall diagram showing a conventional forged product production line.

DESCRIPTION OF SYMBOLS 1... Workpiece cooling device, 2... Workpiece carry-in path (conveyor), 3... Workpiece carry-out path (conveyor), 10... Rotary table, 11... Rotary table main body, 12... Top Wall, 13.14... Partition wall, 15... Workpiece cooling chamber, 20... Cylinder actuator, 30... Workpiece forced cooling means, 31... Casing, 32... Air nozzle, 40...
...Temperature sensor, 50... Button, 60... Slider, 61... Guide rail, 70... Control means,
100...work.

Claims (1)

[Scope of Claims] A turntable rotatably provided between a workpiece loading path and a workpiece unloading path and having a plurality of workpiece cooling chambers around a rotation center; a workpiece carry-in means for sending the workpiece into the workpiece cooling chamber; a workpiece carryout means for sending the workpiece in the workpiece cooling chamber to the workpiece carryout path; and a workpiece provided in each of the workpiece cooling chambers for cooling the workpieces accommodated in the workpiece cooling chamber. a forced cooling means; a temperature sensor provided in each of the workpiece cooling chambers to measure the temperature of the workpiece accommodated in the workpiece cooling chamber; and a temperature sensor provided in the specific workpiece cooling chamber to cool the specific workpiece. When it is detected that the temperature of the workpiece accommodated in the cooling chamber has reached a predetermined temperature, the specific workpiece cooling chamber is occupied at a position corresponding to the workpiece unloading path based on the output signal from the temperature sensor. A workpiece cooling device comprising: control means for rotating the rotary table to position the rotary table.