JP2000026915A - Post treatment of cold working, and cold working equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a post treatment method of cold working, capable of removing lubricating oil adhering to a workpiece after cold working and further capable of removing working stress if necessary and also to provide cold working equipment therefor. SOLUTION: In this post treatment method of cold working, an annular stock 15 being an object to be worked is cold-worked by a cold working device 2, and, while the resultant workpiece is conveyed to a primary storage area 5 by means of a material collecting conveyor 4, etc., heating is applied to the workpiece 16 and a lubricating oil adhereing to this workpiece 16 by means of a heating device 9 to remove the lubricating oil by evaporation and, if necessary, heating temperature is further elevated to remove the working stress of the workpiece 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a post-processing method for cold working such as cold forging and a cold working facility.

[0002]

2. Description of the Related Art There is a cold working method as one of methods for producing a product by plastically working a metal material. Known cold working methods include cold forging, cold rolling, cold rolling, and cold spinning. This cold working method will be described by taking cold roll working as an example. As shown in FIG. 4, a cold roll working device 2 including a material supply device 3, a mandrel 8, a working roll 7, etc., a collecting belt conveyor 4, etc. , A ring-shaped material 15 to be processed is intermittently supplied from the material supply device 3 to the cold roll processing device 3, and cold-processed by the cold roll processing device 3. The workpiece 16 whose diameter has been increased and whose processing has been completed is transported by the collection conveyor 4 to the collection tray 6 of the primary storage location 5, and then transported to another location as needed.

In these cold working processes, a large amount of lubricating oil is used, so that this lubricating oil adheres to the processed work 16 and is transported by the collecting conveyor 4 while the lubricating oil is being conveyed to the primary storage 5. During storage, there are problems such as dripping from the storage place 5 to the packing place during transportation and the like, contaminating the floor, the collecting tray 6 and the like, and adhering to products and devices which should not adhere.

[0004] Further, since these processes are cold, there is an inherent processing stress in the workpiece, and heat treatment and
When a treatment such as carburization is performed, abnormalities in the structure of the heat treatment, carburization distortion, and the like occur, so that it is necessary to perform stress relief annealing before performing the heat treatment, carburization, or the like. However, conventional cold working equipment does not have equipment for annealing, so it is transported to the place where the equipment is located, a factory, etc.
So it was necessary to anneal.

[0005]

An object of the present invention is to remove a lubricating oil adhering to a workpiece after cold working and, in some cases, to remove a working stress, thereby enabling post-processing after cold working. It is an object of the present invention to provide a method and a cold working facility therefor.

[0006]

In order to solve the above-mentioned problems, in the post-processing method for cold working according to the present invention, the material of the workpiece is cold forged, cold rolled, cold rolled, etc. While transporting a workpiece manufactured by cold working to a primary storage place such as a collecting tray, the workpiece and lubricating oil attached to the workpiece are heated to evaporate the lubricating oil. It is to remove. Furthermore, in order to solve the above problems, in the post-processing method of the cold working of the present invention, the material of the workpiece is manufactured by cold working such as cold forging, cold rolling, cold rolling. While transporting the processed workpiece to the primary storage location such as a collecting tray, the workpiece and the lubricating oil adhering to the workpiece are heated and lubricated by induction heating such as high-frequency induction heating or low-frequency induction heating. The purpose of the present invention is to perform stress relief annealing for evaporating oil and removing the processing stress of the workpiece.

Further, in order to solve the above-mentioned problems, in the cold working equipment of the present invention, a workpiece such as a raw material is converted to a cold working device such as a cold forging device, a cold rolling device, a cold roll process or the like. In a cold working facility that has a material feeding device, a cold working device, and a collecting conveyor such as a collecting belt conveyor that transports workpieces, a collecting conveyor between the cold working device and the primary storage location, etc. Is provided with a heating device such as a high-frequency induction heating device and a low-frequency induction heating device.

[0008]

Next, the present invention will be described in detail.
The heating of the workpiece in the post-processing method of the cold working of the present invention,
It is for removing the lubricating oil adhering to the workpiece by evaporation or removing the processing stress generated by this removal and cold working. In the heating only when the lubricating oil attached to the workpiece is removed by evaporation, only the lubricating oil and the surface of the workpiece need to be heated. , Low frequency induction heating, etc., the heating temperature is 50-40
It is about 0 ° C., and the heating time may be about 3 to 15 seconds. In addition, in the case of removing the processing stress while removing the lubricating oil, it is necessary to heat the workpiece to a high temperature and at a high speed. Therefore, it is preferable to perform induction heating such as high frequency and low frequency. The temperature is preferably 900 ° C. and the heating time is preferably longer, but may be about 3 to 180 seconds. In addition,
An example of the lubricating oil used in the cold working of the present invention is a boiling point composed of 25% of a mineral oil, 10% of an oiliness improver, 10% of a sulfur-based extreme pressure agent, 15% of a polymer antiwear agent, and 50% of a synthetic lubricating oil. It is about 360 ° C.

[0009] In the post-processing method of the cold working of the present invention, the workpiece is heated while the work is transferred from the cold working apparatus to a collecting conveyor such as a collecting belt conveyor, while the workpiece is placed on the collecting conveyor. During the transfer from the collecting conveyor to the collecting tray at the primary storage place, the collecting conveyor can be divided into two parts and can be performed between them. This is preferable because there is no need to largely change the layout of the image.

[0010] The heating device in the cold working equipment of the present invention is a heating device using a resistance material or a tunnel furnace, a hot air heating device, a low frequency induction heating, when only the lubricating oil adhering to the workpiece is removed. Device, high-frequency induction heating device and the like. In addition, when removing the processing stress while removing the lubricating oil, a low-frequency induction furnace, a high-frequency induction furnace, or the like that can heat the workpiece to a high temperature at a high speed is used. When using this low-frequency induction heating device, the iron core provided with the coil may be installed so as to go around the work, or the heating coil may be installed so as to go around the work, When using an induction heating device, it may be installed so that the heating coil goes around the workpiece,
The heating coil may be installed spirally so as to be flat.

[0011] Further, in the cold working equipment of the present invention, the heating device is installed at a location between the cold working device and the collecting conveyor, above or around the collecting conveyor, or at a collecting tray between the collecting conveyor and the primary storage location. During the period, two collection conveyors
It can be divided into individual units and installed between them.In the case of a low-frequency induction heating device, an iron core with a coil is installed so as to hold the collecting conveyor, or a heating coil is installed around the collecting conveyor. It is preferable that the heating coil is installed so as to be wound, and in the case of the high-frequency induction heating device, the heating coil is installed so as to be wound around the collecting conveyor, because it is not necessary to largely change the layout of the existing equipment. In addition, the collecting conveyor in the cold working equipment of the present invention may be another conveying means such as a collecting belt conveyor, a chain conveyor, or the like. This is preferable because it does not need to be changed.

[0012]

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a conceptual view of a cold roll processing apparatus according to one embodiment of the present invention, FIG. 2 is a conceptual view of a cold roll processing apparatus, and FIG. 3 is a perspective view of the vicinity of the iron core 10 in FIG. FIG. Cold roll processing equipment 1 according to one embodiment of the present invention
Is a material supply device 3 for intermittently supplying the ring-shaped material 15 to the cold roll processing device 2 and a cold roll for cold-rolling the ring-shaped material 15 of the workpiece supplied from the material supply device 3. A processing device 2, a collecting belt conveyor 4 for transporting a workpiece 16 expanded by the cold roll processing device 2 to a collecting tray 6 in the primary storage 5, and a low-frequency induction heating device for heating the workpiece 16 9.

This cold roll processing apparatus 2 comprises a mandrel 8, a processing roll 7, etc., as shown in FIG. 3, and produces a workpiece 16 in which the thickness of the ring-shaped material 15 is reduced and the diameter of the ring is increased. Is what you do. The low-frequency induction heating device 9 includes an iron core 10 wound with three coils 11 and a power supply device 11, as shown in FIG. The iron core 10 is formed by stacking thin plates, and is installed so as to hold the collecting belt conveyor 4 as shown in FIG. Reference numeral 13 denotes a discharge gutter for moving the workpiece 16 from the cold roll processing device 2 to the collecting belt conveyor 4, and reference numeral 14 denotes a workpiece 16 that has protruded from the discharge gutter 13 and collides. It is a partition that changes its direction.

Next, the operation of this device will be described. The ring-shaped material 15 supplied from the material supply device 3 is cold rolled by the cold roll processing device 2. Processed work 1
6 is discharged from the discharge gutter 13 of the cold roll processing apparatus 2 onto the collecting belt conveyor 4, collides with the partition 14, falls down as shown in FIG. 1, and is placed on the collecting belt conveyor 4. This work is heated to about 700 ° C. while passing between the iron cores wound with three coils 11 (because the belt of the collecting belt conveyor 4 is also made of metal, this belt is also heated). ), The lubricating oil adhering to the workpiece 16 is removed, and the processing stress generated by the cold roll processing is also removed while being stored in the collecting tray 6 of the primary storage location 5.

In the above embodiment, a low-frequency induction heating device is used as a heating device to heat a workpiece to evaporate and remove lubricating oil and perform stress relief annealing. A heating device can also be used. Further, in the above embodiment, the lubricating oil is removed by evaporating and the stress relief annealing is performed.However, when the lubricating oil is removed by evaporation, a hot air generator is provided and hot air is blown to the workpiece. The lubricating oil and the workpiece can be heated by spraying or by installing a tunnel furnace so that the collecting belt conveyor passes therethrough. Although the above embodiment does not include a discharge device (duct) for discharging evaporated lubricating oil or a discharge device and a lubricating oil collecting device or a combustion device, these devices may be provided.

[0016]

According to the post-processing method and the cold working equipment of the cold working of the present invention, the lubricating oil adhering to the workpiece can be easily removed by adopting the above constitution. Also, when performing stress relief annealing, stress relief annealing can be performed following cold working, so there is no need to move to the annealing equipment, and there is no need to wait until the equipment becomes empty, so products can be manufactured quickly. And has an excellent effect that the cost is reduced.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a cold roll processing facility according to one embodiment of the present invention.

FIG. 2 is a conceptual diagram of the cold roll processing apparatus of FIG.

FIG. 3 is a perspective view of the vicinity of the iron core 10 in FIG.

FIG. 4 is a conceptual diagram of a conventional cold roll processing facility.

[Brief description of reference numerals]

 DESCRIPTION OF SYMBOLS 1 Cold roll processing equipment 2 Cold roll processing apparatus 3 Feeding apparatus 4 Collection conveyor, collection belt conveyor 5 Primary storage place 6 Collection tray 7 Processing roll 8 Mandrel 9 Heating device, low frequency induction heating device 10 Iron core 11 Coil 12 Power supply 13 Drain gutter 14 Screen 15 Ring material 16 Workpiece

Claims (3)

[Claims] While transporting a workpiece manufactured by cold working to a primary storage location, the workpiece and lubricating oil adhering to the workpiece are heated to evaporate and remove the lubricating oil. A post-treatment method for cold working, characterized in that: 2. During the transportation of a workpiece produced by cold working to a primary storage location, the workpiece and lubricating oil adhering to the workpiece are heated to evaporate and remove the lubricating oil. A post-treatment method for cold working, wherein the work is subjected to stress relief annealing. 3. A feeding device (3), a cold working device (2),
In the cold working equipment (1) having the collecting conveyor (4) for transporting the workpiece (16) to the primary storage location (5), between the cold working device (2) and the primary storage location (5). A cold working facility comprising a work (16) and a heating device (9) for heating lubricating oil adhering to the work.