MXPA01005223A - Hobbing machine for dry cutting - Google Patents

Hobbing machine for dry cutting

Info

Publication number
MXPA01005223A
MXPA01005223A MXPA/A/2001/005223A MXPA01005223A MXPA01005223A MX PA01005223 A MXPA01005223 A MX PA01005223A MX PA01005223 A MXPA01005223 A MX PA01005223A MX PA01005223 A MXPA01005223 A MX PA01005223A
Authority
MX
Mexico
Prior art keywords
cooling water
cooling
fastener
dry cutting
workpiece
Prior art date
Application number
MXPA/A/2001/005223A
Other languages
Spanish (es)
Inventor
Egawa Tsuneo
Tokawa Takahide
Kage Hirofumi
Nishimura Yikihisa
Original Assignee
Mitsubishi Heavy Ind Ltd
Filing date
Publication date
Application filed by Mitsubishi Heavy Ind Ltd filed Critical Mitsubishi Heavy Ind Ltd
Publication of MXPA01005223A publication Critical patent/MXPA01005223A/en

Links

Abstract

The hobbing machine for dry cutting which comprises heat insulators (46) in regions of an attaching table (19) and a support center (21) where work (23) contacts them, and a cooling device for cooling the attaching table (19) and support center (21), wherein the transmission of heat from the work (23) being cut is prevented while the attaching table (19) and support center (21) are controlled to a predetermined temperature, thereby suppressing a rise in the temperature of the attaching table (19) and support center (21) even if the temperature of the work (23) rises as a result of dry-cutting without feeding cutting oil.

Description

DRILLING MILL DRY DESCRIPTION TECHNICAL FIELD The present invention relates to a dry cutting milling cutter for cutting the gear teeth dry; that is, to cut gear teeth without using metal cutting oil.
BACKGROUND OF THE ART A milling machine that tines gear teeth is a traditional mechanical tool for milling gear teeth. There is the vertical milling machine, which cuts the gear teeth of a workpiece supported around a substantially vertical central axis and the horizontal milling machine, which cuts gear teeth of a workpiece supported around a substantially horizontal central axis.
In a milling machine, a milling cutter, supported in such a way that it is free to perform rotary movements, is engaged to a workpiece fixed by a fastener, in order thereby to cut gear teeth on the outer circumference of said workpiece. HE moves the rotating mill towards the workpiece to thereby cut gear teeth with a predetermined profile. During the cutting process, oil is applied to cut metals to the part of the piece being processed that is in the process of cutting, with the purpose of lubricating and cooling the part of the piece under development as well as cooling the fastener.
As in other fields of industry, the field of milling has shown several positive changes that increase their productivity and save labor. In addition, in recent years, the field of milling has been invited to take environmental measures. To meet this, the field of milling has resorted to the use of so-called dry cutting, a process in which oil is not used to cut metals during cutting. The metal cutting oil not only gives off an unpleasant odor and produces stains with the splashed oil damaging the working environment, but also causes a problem in which the treatment of waste oils involves atmospheric or environmental contamination.
One of the main problems to solve in the introduction of dry cutting in the field of milling is to design measures against the wear of a milling cutter. Between The measures to suppress the wear of a milling cutter are the use of a carbide-tipped cutter and a cutter made of high-speed tool steel and coated with a wear-resistant material.
However, during dry cutting, the temperature of the workpiece increases and the heat thus generated is transmitted to the fastener, thus increasing the temperature of the fastener little by little. When a new workpiece is fixed to the fastener heated in this way, the workpiece suffers from thermal expansion. In the event that the piece being processed is cut in that expanded manner, an excess cut will result; that is, the accuracy of the milling will be impaired.
The present invention complies with the above and an objective of the foregoing is to provide a dry cutting milling machine with the ability to prevent an increase in the temperature of the fastener even during the dry cutting process.
COMPENDIUM OF THE INVENTION The present invention presents a dry cutting milling cutter for dry cutting, without using oil for cutting metals, gear teeth to a workpiece fixed by a fastener, characterized by having cooling means to prevent heating of the fastener through the fluid.
The holder can be cooled thanks to the use of cooling means. In this way, even when the temperature of the workpiece increases as a result of dry cutting the workpiece without supplying it with oil for cutting metals, an increase in temperature in the clamp can be suppressed.
The present invention presents a dry cutting milling cutter for dry cutting, without using oil for cutting metals, gear teeth to a workpiece fixed by a fastener, which is characterized by having heat insulating material in the part of the fastener that will be in contact with the workpiece.
The heat insulating material prevents the transmission of heat from the workpiece to the fastener. Accordingly, even when the temperature of the workpiece increases as a result of dry cutting the workpiece without supplying it with oil for cutting metals, an increase in temperature in the clamp can be suppressed.
The present invention presents a dry cutting milling cutter for dry cutting, without using oil for cutting metals, gear teeth to a workpiece fixed by a fastener, which is characterized by having cooling means to not allow heating of the fastener through the fluid, as well as having heat insulating material in the part of the fastener that will be in contact with the workpiece.
The fastener can be cooled by the use of cooling means, while the heat insulating material prevents heat transmission from the workpiece to the fastener. In this way, even when the temperature of the workpiece increases as a result of dry cutting the workpiece without supplying it with oil for cutting metals, an increase in temperature in the clamp can be suppressed.
In addition, the dry cutting milling machine of the present invention has the following characteristics. The cooling means takes the form of a cooling unit to provide cold water to a cooling water path established in the holder for the purpose of cooling the water. The chiller unit comprises a tank of cooling water and the cooling water contained in the cooling water tank flows through the cooling water path. The cooling water tank has a temperature sensor, as well as a cooling fan. When the temperature sensor detects that the cooling water temperature of the cooling water tank is equal to or greater than the predetermined value, the cooling fan starts to operate in order to maintain the temperature of the cooling water contained in the water tank Cooling to the default value. The cooling water path is in the holder, near the part of the holder that will be in contact with the workpiece.
Another feature of the dry cutting milling machine of the present invention is that the heat insulating material is ceramic.
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a side view of a dry cutting milling machine according to one embodiment of the present invention; Figure 2 is a scale view of one of the main parts of the dry cutting mill of Figure 1; and Figure 3 is a circuit diagram of the chiller unit.
THE BEST WAY TO CARRY OUT THE INVENTION The present invention will be described in detail below with reference to the drawings.
As shown in Figure 1, a column 13 rests on a bed 12 of a dry cutting mill 11 such that it freely corresponds in a horizontal direction (to the right and left direction of Figure 1). A lifting head 14 rests on a front face of the column 13 vertically slidable. A head of the cutter 15 is supported on the lift head 14 so that it can rotate about the horizontal axis. A cutter 17 is placed at the head of the cutter 15 by means of an axis of the cutter 16.
A table 18 is mounted on the bed 12 of the dry cutting mill 11 such that it can be rotated about a vertical axis. A table of the holder 19 is held in table 18. A support column 20 is placed vertically with respect to the bed 12 opposite the column 13 with the table 18 lying between them. A support center 21, which moves along the central axis of the rotation of the table 18, is supported on the support column 20 in a vertically movable manner. A draw cylinder 22 installed in the support column 20 is operated for the purpose of vertically moving the support center 21.
A workpiece 23 is placed in table 18 through a table of the clamp 19. The draw cylinder 22 is operated in order to lower the support center 21, thereby holding the workpiece 23 between the table the holder 19 and the support center 21. Since the table 18 is rotated, the workpiece 23 is rotated about the vertical axis. That is, the table of the holder 19 and the support center 21 form a fastener.
A cooling unit 31 is provided for use with the table of the holder 19 and the support center 21 for the purpose of suppressing the temperature increase. Heat insulating material is placed both on the table of the holder 19 and on the support center 21 on the part that will be in contact with the workpiece 23, thereby preventing heat transfer from the workpiece 23. Both the cooling unit 31 and the heat insulating material will be described with reference to figures 2 and 3.
As shown in Figure 2, when the workpiece 23 is held between the table of the fastener 19 and the support center 21, the workpiece 23 is placed in the area of the peripheral edge 32 of the upper surface of the table of the holder 19, so that the lower surface of the workpiece 23 is in contact with the peripheral edge area 32; an area of the axis of the support center 21 extends to the workpiece 23 so that the circumferential surface 33 thereof is in contact with the inner circumferential surface of the workpiece 23; and an area of the peripheral edge 35 of the lower surface of a pressed portion 34 of the support center 21 presses the workpiece 23 so that the top surface of the workpiece 23 comes into contact with the peripheral edge area 35.
The tubes 36 and 37, which function as cooling water paths for the circulation thereof, are located in the support center 21 near the outer circumferential surface 33 of the shaft part and near the peripheral edge area 35 of the pressed part 34, respectively. The pipes 36 and 37 for circulating the cooling water communicate with a cooling water inlet pipe 38 and cooling water outlet pipe 39, which are connected to the support center 21. A pipe 40, which operates as a water route of cooling for the circulation of the same, is installed in the table of the holder 19 near the area of the peripheral edge 32. The tube 40 for the circulation of the cooling water communicates with a cooling water inlet pipe 41 and a tube of cooling water outlet 42, which are connected to the table of the holder 19.
As shown in Figure 3, the cooling water inlet pipes 38 and 41 are connected to a pump 44 of a cooling water tank 43, so that the latter is pressurized therefrom by the pump 44 The cooling water outlet pipes 39 and 42 are connected to the cooling water tank 43. The cooling water transferred under pressure through the pump 44 circulates through the pipes 36, 37 and 40 and returns to the tank. cooling water 43 through the cooling water outlet pipes 39 and 42. The cooling water tank 43 is equipped with a cooling fan 45. The cooling fan 45 starts to operate when the cooling water temperature contained in the cooling tank 43, according to the measurements of a temperature sensor 51, is equivalent to or greater than the predetermined value. Consequently, the cooling water contained in the tank Cooling 43 is maintained at a predetermined temperature.
The cooling water which is maintained at a predetermined temperature circulates through the tubes 36, 37 and 40 so that the increase in temperature of the holder is suppressed; i.e., in the table of the holder 19 and the support center 21. In the above-described embodiment, the cooling water unit 31 sends the cooling water through the pipes 36, 37 and 40 to cool the water. However, another cooling fluid, such as cooling oil or cooling air, can circulate through tubes 36, 37 and 40.
As shown in Figure 2, a ceramic plate that functions as a heat insulating material 46 is placed in each of the parts of the fastener that will come into contact with the workpiece 23; in particular, the area of the peripheral edge 32 of the upper surface of the table of the holder 19, the area of the peripheral edge 35 of the lower surface of the pressed part 34 of the support center 21 and the outer circumferential surface 33 of the part of the axis of the support center 21. The heat insulating material 46 thus placed prevents the transmission of heat from the workpiece 23 in milling to the fastener; i.e., to the table of the holder 19 and the support center 21.
The heat insulating material 46 can be applied by the ceramic coating or thermal spray of ceramics. It is possible to use a metal with thermal conductivity lower than that of iron, for example stainless steel, as a heat insulating material 46.
When the dry cutting milling machine 11 is to be used to cut gear teeth in the workpiece 23, said workpiece 23 is held between the table of the clamp 19 and the support center 21 to thereby fix the workpiece in preparation 23 to table 18. The cutter 17 is fixed to the axis of the cutter 16 of the head of the cutter 15. The table 18 is rotated so that the workpiece 23 is also rotated. Also, the axis of the The cutter 16 is rotated so that the cutter 17 is also rotated. While the cutter 17 and the workpiece 23 are rotating at the same time, the cutter 17 moves inside the workpiece 23 to cut it. A part of the cutting edge of the cutter 17 cuts the gear teeth on the periphery of the workpiece 23. During the cutting process, it is not supplied with oil for cutting metals; that is, a dry cut is made.
During the cutting process, the pump 44 of the cooling unit 31 is put into operation to transfer the cooling water, which is contained in the cooling water tank 43 and is controlled at a predetermined temperature, through the tubes cooling water inlet 38 and 41. The cooling water thus transferred circulates through the pipes 36, 37 and 40 and then returns to the cooling water tank 43 through the cooling water outlet pipes 39 and 42. Therefore, a part of the table of the holder 19 located near the area of the peripheral edge 32 of the upper surface of the table of the holder 19 is cooled; a part of the support center 21 located near the peripheral edge area 35 of the lower surface of the pressed part 34 of the support center 21; and a portion of the support center 21 located near the outer circumferential surface 33 of the shaft portion of the support center 21.
Because the heat insulating material 46 is placed on a surface of the fastener that is in contact with the workpiece 23, the table of the fastener 19 and the support center 21 are insulated in thermal terms from the workpiece 23 that is being milled.
Accordingly, even when the temperature of the workpiece 23 increases during cutting, the heat insulating material 46 prevents heat transfer from the workpiece 23 to the table of the clamp 19 and the support center 21. In addition , the table of the holder 19 and the support center 21 are cooled by means of the cooling water which is controlled at a predetermined temperature, whose temperature increase is suppressed.
Therefore, even when the temperature of the workpiece 23 increases because the workpiece 23 undergoes a dry cut, that is, it is cut without using oil to cut metals, the table of the fastener 19 and the center 21 are not prone to an increase in temperature, hence the thermal deformation of the dry cutting mill 11 is avoided and the workpiece 23 has to be re-made. Therefore, a high degree of maintenance can be maintained. cutting accuracy.
The above embodiment is described at the same time as the dry cutting milling machine 11 is mentioned which includes heat insulating material 46 applied to a surface of the fastener and the cooling unit 31 for cooling the table of the fastener 19 and the center of support 21. Without However, the dry cutting milling machine 11 can only include either the heat insulating material 46 or the cooling unit 31. The above embodiment is described at the same time as a vertical milling machine is mentioned. However, the present invention can also be applied to a horizontal milling machine, which cuts gear teeth to a workpiece held in a substantially horizontal state.

Claims (8)

1. A dry cutting milling cutter for dry cutting, without using oil for cutting metals, gear teeth to a workpiece fixed by a fastener, which is characterized by having cooling means to cool the fastener through fluids.
2. A dry cutting milling cutter for dry cutting, without using oil for cutting metals, gear teeth to a workpiece fixed by a fastener, characterized by having heat insulating material in the part of the fastener that is in contact with the piece under development.
3. A dry cutting milling cutter for dry cutting, without using oil for cutting metals, gear teeth to a workpiece fixed by a fastener, characterized by having cooling means to cool the fastener through fluids and characterized by having heat insulating material in a part of the fastener that is in contact with the workpiece.
4. A dry cutting milling machine as described in claim 1 or 3, whose feature is that the cooling means takes the form of a cooling unit to supply cooling water to a route of cooling water located in the holder so that the water cools.
5. A dry cutting milling machine as described in claim 1, wherein the cooling unit comprises a cooling water tank and cooling water contained in the water tank. Cooling circulates through the cooling water path.
6. A dry cutting milling machine as described in claim 5, whose characteristic is that the cooling water tank comprises a temperature sensor and a cooling fan, likewise, when the temperature sensor detects that the water temperature When the cooling water contained in the cooling water tank is equal to or greater than the predetermined level, the cooling fan starts to function for the purpose of maintaining the cooling water temperature contained in the cooling water tank at the predetermined level.
7. A dry cutting milling machine as described in any of claims 4 to 6, whose characteristic is that the cooling water path is installed in the fastener near the part of the fastener that is in contact with a work piece. elaboration.
8. A dry cutting milling machine as described in claim 2 or 3, whose characteristic is that the heat insulating material is ceramic.
MXPA/A/2001/005223A 2001-05-24 Hobbing machine for dry cutting MXPA01005223A (en)

Publications (1)

Publication Number Publication Date
MXPA01005223A true MXPA01005223A (en) 2001-12-04

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