JP4356910B2 - Semi-dry flat rolling process - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a semi-dry (trace amount of lubricating oil mist) flat rolling process in flat rolling for processing small-diameter splines, gears, and the like.
[0002]
[Prior art]
A conventional flat rolling method has been processed by a wet method as shown in FIG. The coolant nozzle 6 directly applies the coolant 7 to the workpiece 3 which is a workpiece from directly above the workpiece, and the coolant 7 penetrates between the forming rack teeth 12 and 13 and the workpiece 3 to form an oil film. Form. In the conventional flat rolling method, the coolant nozzle 6 is directly applied to the workpiece 3, so that it is difficult for the coolant 7 to be applied to the rack teeth 12, 13 when the forming rack (hereinafter referred to as rack) 1, 2 is returned. Naturally, sludge-like processing waste (for example, FIG. 1B) 70 remains on the rack tooth surface, and when processing the next workpiece 3, the needle-like processing is performed between the rack teeth 12 and 13 and the workpiece 3. The life of the biting teeth of the rack teeth 12 and 13 (for example, FIG. 1 (a) 15) was shortened.
[0003]
The conventional flat rolling method is plastic processing, and most of the coolant is oily. In order to remove the machining waste even in the conventional wet processing, air blow can be performed when the rack is returned, but the coolant adhering to the rack tooth surface becomes mist, which deteriorates the working environment. In addition, with wet oil-based and water-soluble coolant, machining waste cannot be removed unless high-pressure air blow is used, and when high pressure is used, a cover and a dust suction device that prevent the coolant from scattering are required, resulting in high costs. Recently, there is an example of using a water-soluble coolant instead of an oil-based coolant. However, the wet oily-water soluble coolant, there is a problem that altered the mix with the lubricating oil of the slide corruption.
[0004]
[Problems to be solved by the invention]
The first object of the present invention is to provide a semi-dry flat rolling method that does not use wet oil-based or water-soluble coolant and minimizes the amount of coolant used .
A second object of the present invention, lubricating oil and alteration without the problem of corruption and mixed slide as in the case of wet oil-soluble coolant, does not require a large coolant tank, friendly semi-dry flat environmentally It is to provide a rolling method .
[0005]
[Means for Solving the Problems]
According to a first aspect of the present invention , in a flat rolling process method for machining a small-diameter spline, gear, etc., one or both of a forming rack that meshes with a work and a groove of a forming rack before meshing with the work. over trace lubricating oil mist rolling in one or both of tooth grooves through the mist nozzle plus at least one pressurized air substantially parallel to the tooth groove toward, and wherein Fuo A semi-dry flat rolling process characterized in that, when the ming rack is returned, the mist nozzle to which the pressurized air is added removes the machining waste generated and adhered to the tooth surface of the forming rack by rolling. It became to provide the law .
[0006]
According to a second aspect of the present invention, in the flat rolling process method for machining a small-diameter spline, gear, etc., one or both of the forming rack that meshes with the work and the tooth groove of the forming rack before meshing with the work. And at least one minute lubricating oil mist nozzle arranged substantially parallel to the tooth groove, and an air supply device for sending pressurized air to the minute lubricating oil mist nozzle ,
The micro-lubricating oil mist uses a semi-dry flat rolling process characterized by using highly biodegradable oil types including vegetable oils and synthetic oils, as in the case of wet oil-based and water-soluble coolants. It has become a globally friendly semi-dry flat rolling process that does not have the problem of deterioration and decay when mixed with lubricating oil and does not require a large coolant tank.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to FIG. FIG. 1A is a schematic perspective view of a main part of a semi-dry flat roll forming apparatus used in the semi-dry flat roll forming method according to the first embodiment of the present invention, and FIG. The partial enlarged view of the tooth slot 8 of the left-side forming rack 1 before meshing with the workpiece is shown. The semi-dry rolling apparatus used in the semi- dry flat rolling process according to the first embodiment of the present invention is a forming rack (hereinafter referred to as a rack) 1 that meshes with a work 3 on which small-diameter splines, gears, etc. are processed. 2 and an air supply (not shown) arranged substantially parallel to the tooth grooves 8 and 9 toward both the tooth grooves 8 and 9 of the racks 1 and 2 before the meshing with the work 3 (only one may be provided). And mist nozzles 10 and 11 using the apparatus . The left rack mist nozzle 11 is directed toward the tooth groove 8 before meshing with the workpiece 3 above the workpiece 3, and the right rack mist nozzle 10 is meshed with the workpiece 3 below the workpiece 3 before meshing It is arranged in front of the groove 9 (in each case, the back side).
[0008]
In operation, the workpiece 3 supported by the head stock center 5 and the tail stock center 4 is moved by the left rack 1 moving downward and the right rack 2 moving upward by a rolling disk driving device (not shown). Teeth are carved into the work piece 3 by rolling. At this time, a minute amount of mist passes through the grooving nozzles 10 and 11 in the tooth grooves 8 and 9 of the forming racks 1 and 2 before meshing with the work 3. As a result, rolling of small-diameter splines and gears is performed. The minute amount of mist becomes a lubricant and penetrates between the rack tooth surfaces 12 and 13 and the workpiece 3 to form an oil film. In the example of FIG. 1, trace lubricating oil mist may be 5 to 10 cc / h traces were Tsu trough per for 1 mist nozzle. Sludge-like processing waste 70 (FIG. 1 (b)) remains on the tooth surfaces of the rack teeth grooves 8 and 9, and when the next workpiece 3 is machined, the rack teeth 12 and 13 and the workpiece 3 are separated. Although the sludge-like processing waste 70 adhered to the surface remains, the minute amount of lubricating oil mist is arranged toward the teeth 8 and 9 and almost parallel to the teeth 8 and 9 because of the mixture of air and the minute amount of lubricating oil . The sludge-like processing waste 70 can be blown off by the air pressure when the racks 1 and 2 are returned. If there is no processing scrap 70 on the tooth surface of the rack tooth groove, the processing waste 70 does not enter between the rack and the work piece when processing the next work piece, and between the tooth surface of the work piece and the rack tooth groove. Friction was reduced and the rack tooth surface was not damaged, and the life of the biting teeth 15 (FIG. 1A) of the rack teeth 12 and 13 and naturally the life of the rack was extended.
[0009]
In the flat rolling device for processing small-diameter splines, gears, etc. of the embodiment used in the semi-dry flat rolling method of the second invention of the present invention, the forming rack that meshes with the workpiece, and before the meshing with the workpiece against the workpiece At least one minute lubricating oil mist nozzle disposed substantially parallel to one or both of the teeth of the forming rack, and an air supply device for sending pressurized air to the mist nozzle; Including
The above-mentioned trace amount of lubricating oil mist has no problem of deterioration and decay when mixed with slide lubricating oil as in the case of wet oil-based or water - soluble coolant, using vegetable oil or synthetic oil with high biodegradability. does not require a large coolant tank, the man has become as providing a friendly Semido lie flat rolling method to the global environment, which may be a thing that should not be in harm.
[0010]
【Example】
Using the apparatus of FIG. 1 of the present invention, a workpiece having S45C and hardness HB240 is prepared as a workpiece material,
As processing parameters, m = 1.058, pressure angle = 30 °, number of teeth = 20,
Tooth width = 30 mm
When the gradient of one tooth of the forming rack was 7 μm, 24,000 workpieces were rolled and the machining accuracy was measured every 2000 pieces.
(a) Tooth profile error variation: 20μm
(b) Tooth line error variation: 10 μm
(c) Cumulative pitch error: 30 μm
The measured value was obtained. The processing accuracy based on this measured value was not much different from wet (oil-based / water-soluble) processing, and the rack teeth were damaged (weared) in the same manner as in wet (oil-based / water-soluble) processing.
[0011]
【The invention's effect】
In the flat rolling apparatus for processing small-diameter splines and gears of the embodiment used in the semi-dry flat rolling process method of the first invention of the present invention, pressurized air arranged substantially parallel to the tooth groove is added. The minute amount of lubricating oil mist from the nozzle for mist is sufficiently dispersed in the teeth of the forming rack , and the minute amount of lubricating oil mist becomes a lubricant and penetrates between the rack tooth surface and the work piece to form an oil film. Sludge-like processing waste adhering between the rack teeth and the work piece when machining the work piece can be blown off when the rack is returned, reducing the friction between the tooth surface of the work piece and the rack teeth and reducing the rack tooth. No damage to the surface, and the life of the rack tooth bite, which naturally extends the life of the rack, so that the life of the forming rack is kept the same as when using wet oil-based or water-soluble coolant. and Ri, minimal lubricant and alteration without the problem of corruption and mixed slide as in the case of water-soluble coolant, also does not require a large coolant tank, without using the oil-soluble coolant wet, the coolant usage A semi-dry flat rolling process was provided.
In the flat rolling apparatus for processing small-diameter splines, gears and the like of the embodiment used in the semi-dry flat rolling process method of the second invention of the present invention,
The above-mentioned trace amount of lubricating oil mist does not have the problem of deterioration and spoilage when mixed with slide lubricating oil as in the case of wet oil-based or water - soluble coolant when using a highly biodegradable oil such as vegetable oil or synthetic oil. does not require a large coolant tank, the man has become as providing a friendly Semido lie flat rolling method to the global environment, which may be a thing that should not be in harm.
[Brief description of the drawings]
1A is a schematic perspective view of a main part of a semi-dry flat roll forming apparatus used in a semi-dry flat roll forming method according to an embodiment of the first invention of the present invention, and FIG. The partial enlarged view of the tooth slot 8 of the left side forming rack 1 before meshing with the workpiece | work of a) is shown.
FIG. 2 is a schematic perspective view of a main part of a flat rolling processing apparatus used in a conventional flat rolling processing method .
[Explanation of symbols]
1, 2 ··· Forming rack (rack) 3 · · Work 8, 9 · · Tooth groove (before meshing with workpiece) 10, 11 · · Mist nozzle
12, 13, ... Foaming rack teeth 70 ...

Claims (2)

In the flat rolling process for machining small-diameter splines and gears, the forming rack that meshes with the work and the tooth groove of the forming rack before the meshing work is counteracted with one or both of them. At least one of the tooth grooves is rolled by applying a minute amount of lubricating oil mist through a mist nozzle to which at least one pressurized air is disposed, and the pressure is applied when the forming rack is returned. A semi-dry flat rolling method characterized in that processing waste generated and adhered to the tooth surface of the forming rack by rolling is removed with a mist nozzle to which air is added. In the flat rolling process for machining small-diameter splines and gears, the forming rack that meshes with the work and the tooth groove of the forming rack before the meshing work is counteracted with one or both of them. And at least one nozzle for a minute amount of lubricating oil mist, and an air supply device for sending pressurized air to the minute amount of lubricating oil mist nozzle ,
A semi-dry flat rolling method characterized in that the trace amount of lubricating oil mist uses a highly biodegradable oil species including vegetable oil and synthetic oil.

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