KR102635879B1 - CNC complex automatic lathe with integrated turning and hob processing - Google Patents

Abstract

The present invention relates to a CNC complex automatic lathe. When producing special gear products, the existing shape processing process, which is separated into primary (turning) processing and secondary (hobbing) processing, can be unified and the error rate due to thermal deformation can be reduced. We provide a CNC composite automatic lathe with integrated turning and hob processing that can solve the problem, and includes a material supply unit provided on one side of the main body to supply materials; a processing unit that processes the material transferred from the supply unit; A key operation unit that selects the operation of the processing unit; A display unit that displays the operating status of the processing unit; and a control unit that controls operations of the material supply unit, the processing unit, the key operation unit, and the display unit.

Description

CNC complex automatic lathe with integrated turning and hob processing}

The present invention relates to a CNC complex automatic lathe, and more specifically, to the existing shape processing process separated into primary (turning) processing and secondary (hobbing) processing (also known as hobbing processing) when producing special gear products. It is about a CNC composite automatic lathe that unifies turning and hob processing and can unify the error rate due to thermal deformation.

A complex automatic lathe refers to a machine tool that processes materials by transporting them on a fixed main axis. It is equipment that carries out the process from material input to product completion in a one-stop process, and is used to produce gear parts for various industrial machines and gears for home appliances. It is used to produce a variety of ultra-precision gear products ranging from parts to automotive gear parts.

The ultra-precision gear products currently being supplied can be divided into two types: the Worm Gear type, which is manufactured through general turning processing, and the Spur Gear (Sun Gear or Spur Gear) type, which requires an additional process of special hob processing after turning processing. there is.

Currently, spur gear types account for approximately 30% of the annual production of ultra-precision gear products, and as the commercialization of future vehicles such as electric vehicles and hydrogen electric vehicles spreads more rapidly, the production of spur gear type gear products is expected to increase rapidly. It is expected that

Worm gear type gear products can only be produced through primary turning, while spur gear type gear products with special shapes must undergo secondary hob processing to machine the gear shape on the side.

However, most general composite automatic lathes are dedicated to turning processing and are equipped only with a turning processing unit, so in order to produce sun gear type gear products, the machining work must be outsourced to an external hob processing specialist company. .

In this case, expensive outsourcing costs, which account for about 40% of the product price of Sungear, are incurred, and many difficulties continue in terms of reducing production costs and competing on price with low-cost products from China.

As stated above, management difficulties are encountered due to the high outsourcing cost of hob processing, low work efficiency, and excessive quality response costs.

Precision gears are a promising product line whose development demand is expected to increase significantly, but it is a product that may increase difficulties in management and profitability if hob processing is not unified even if demand increases.

To add, due to the division of the process into primary (turning) machining (performed in-house) and secondary (hob) machining (outsourced), productivity decreased due to the increase in production lead time due to outsourcing (outsourcing processing period of about 4 days). Due to the outsourcing of secondary (hob) processing, additional costs such as logistics costs, management costs, and intermediate inspection costs continue to arise, making it difficult to reduce production costs. In order to reduce production lead time, such as outsourcing processing, when performing large quantities of primary processing, , quality risks increase due to thermal distortion errors, time and cost losses continue to occur due to defects due to dimensional unevenness during secondary (hob) processing due to process division, and when researching and developing new special ultra-precision gear products, 2 Due to outsourcing of tea (hob) processing, various difficulties are occurring in sampling work such as small quantity production of various types, new orders for product diversification, and research and development.

Meanwhile, when machining gears using a complex automatic lathe, dimensional errors may occur due to heat generation due to continuous machining by linking turning and hob machining.

The heat generation phenomenon caused by such continuous processing may also affect secondary hob processing, and as heat generation during secondary hob processing increases, processing errors may become larger and the defect rate may increase.

Therefore, a new method is required to resolve difficulties in quality, cost, and management through unification of turning and hob processing, and to compensate in real time for thermal deformation problems caused by heat generation during continuous processing.

KR 10-2022-0008521 A1 KR 10-2059742 B1 KR 10-0748831 B1 KR 10-0787207 B1

Therefore, the present invention was devised to solve the above problem, and when producing special gear products, it is possible to unify the existing separate shape processing processes into primary (turning) machining and secondary (hobbing) machining, and to reduce heat distortion caused by thermal deformation. One purpose is to provide a CNC complex automatic lathe with unified turning and hob processing that can eliminate error rates.

Other objects and advantages of the present invention will be explained below and will be learned by practice of the present invention. Additionally, the objects and advantages of the present invention can be realized by the means and combinations indicated in the claims.

In order to achieve the above object, the CNC automatic composite lathe in which turning and hob processing are integrated according to the present invention includes a material supply unit provided on one side of the main body to supply material; a processing unit that processes the material transferred from the supply unit; A key operation unit that selects the operation of the processing unit; A display unit that displays the operating status of the processing unit; and a control unit that controls operations of the material supply unit, the processing unit, the key operation unit, and the display unit, wherein the processing unit includes: a main spindle and a sub-spindle for transporting or supporting the material; a turning unit that performs turning of the material; and a hob processing unit that hobs the material.

In addition, the hob processing unit includes a hob head disposed above the main spindle at a predetermined height and movable in X, Y, and Z directions with respect to the main spindle; a hob mechanism mounted on the hob head; and an angle adjuster for adjusting the angle of the hob mechanism during hob processing.

In addition, it further includes a thermal deformation prevention part that prevents thermal deformation of the main spindle, and the thermal deformation prevention part includes a temperature measuring part that measures the temperature of the axis of the main spindle. a shape measuring unit that measures the shape of the main axis of the main spindle; a determination unit that determines whether the main spindle is abnormal by analyzing the measured temperature of the shaft center and the shape of the main shaft; and a plurality of cooling units that spray fluid toward the main spindle to cool the main spindle when an abnormal signal is input from the determination unit.

In addition, the cooling unit is disposed up and down and left and right on the side wall around the main spindle, and includes a supply pipe that supplies fluid from a fluid supply unit and is rotatably installed; A control unit installed to adjust the amount of fluid; and a spray nozzle through which fluid is sprayed.

In addition, the adjustment unit is characterized in that it includes a plate member configured to have one end rotatably supported within the body member and the other end to be moved toward the center of the body member.

In addition, it further includes a cutting oil supply unit that supplies cutting oil to the machining unit, wherein the cutting oil supply unit includes an inlet into which cutting oil used in a machining process in the machining unit flows; a storage unit that receives cutting oil from the inflow unit and stores it; A primary purification unit that receives cutting oil from the storage unit and separates metal foreign substances contained in the cutting oil; a secondary purification unit that receives the cutting oil purified by the primary purification unit and separates non-metallic foreign substances contained in the cutting oil; and a resupply unit that re-supplies the cutting oil purified by the secondary purification unit to the machining unit, wherein the primary purification unit includes: an induction tube that induces adsorption of metal foreign substances; and a removal unit inserted into the guide tube to remove adsorbed metal foreign substances.

In addition, the secondary purification unit has a shape whose diameter becomes smaller as it approaches the lower opening from the upper opening, and is a cyclone purifying unit that receives cutting oil from the primary purifying unit and removes non-metallic foreign substances through centrifugation and oil-water separation. It is characterized by being composed of.

As described above, according to the present invention, turning and hob machining can be unified in one step by providing a CNC composite automatic lathe with a unified turning and hob machining unit to enable both turning and hob machining, thereby reducing expensive outsourcing costs. Not only is it not required separately, but it also has the advantage of reducing production costs and competing on price with low-cost products from China.

As described above, when applying the unification process of turning and hobbing, existing outsourcing costs can be significantly reduced, making it possible to produce spur gear products at a price reduced by about 40% compared to the existing cost. Accordingly, it is believed that it will be possible to meet the unit price reduction demands of customers (complete vehicle manufacturers and primary vendors), and will also be able to gain an upper hand in unit price competition with Chinese products when bidding on newly developed spur gear products in the future. .

1 is a schematic configuration diagram of a CNC composite automatic lathe according to the present invention;
Figure 2 is a photograph showing a CNC composite automatic lathe according to the present invention,
Figure 3 is a photograph showing the processing unit according to the present invention,
Figure 4 is a photograph showing the hob processing part according to the present invention,
Figure 5 is a photograph showing the hob processing state according to the present invention,
Figure 6 is a diagram showing the configuration of the thermal deformation prevention portion according to the present invention;
7 to 9 are diagrams showing the configuration of the cooling unit according to the present invention,
10 and 11 are diagrams showing the configuration of the cutting oil supply unit according to the present invention,
Figure 12 is a diagram showing the economic performance according to the present invention,
Figures 13 and 14 are diagrams to explain the advantages of the CNC complex automatic lathe according to the present invention.

Specific details of other embodiments are included in the detailed description and drawings.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms. In the description below, when a part is connected to another part, this is not only the case when it is directly connected. This also includes cases where they are connected through other media in between. In addition, in the drawings, parts unrelated to the present invention are omitted to clarify the description of the present invention, and similar parts are given the same reference numerals throughout the specification.

Hereinafter, the present invention will be described with reference to the attached drawings.

Figure 1 is a schematic configuration diagram of a CNC composite automatic lathe according to the present invention, Figure 2 is a photograph showing the CNC composite automatic lathe according to the present invention, Figure 3 is a photograph showing a processing unit according to the present invention, and Figure 4 is a photograph showing the processing unit according to the present invention. A photograph showing a hob processing portion according to the present invention, Figure 5 is a photograph showing a hob processing state according to the present invention, Figure 6 is a diagram showing the configuration of a heat deformation prevention portion according to the present invention, and Figures 7 to 9 are a photograph showing the hob processing state according to the present invention. Figures 10 and 11 are diagrams showing the configuration of a cooling unit according to the present invention, Figures 10 and 11 are diagrams showing the configuration of a cutting oil supply unit according to the present invention, Figure 12 is a photograph showing the machining result according to the present invention, and Figures 13 and 14 are This is a drawing to explain the advantages of the CNC composite automatic lathe according to the present invention.

Referring to Figures 1 and 2, the CNC composite automatic lathe according to the present invention includes a material supply unit 10 provided on one side of the main body 11 to supply the material S; A processing unit 20 that processes the material S transferred from the supply unit 10; A key operation unit 30 that selects the operation of the processing unit 20; A display unit 40 that displays the operating state of the processing unit 20; And it may be configured to include a control unit 50 that controls the operations of the material supply unit 10, the processing unit 20, the key operation unit 30, and the display unit 40.

The processing unit 20 includes a main spindle 21 and a sub spindle 22 for transporting or supporting the material (S); a turning unit 23 that performs turning of the material (S); and a hob processing unit 24 that hobs the material S.

The main spindle 21 forms a main axis and is capable of chucking the material S.

The sub-spindle 22 forms a sub-axis and can chucking the other end of the material (S).

The main spindle 21 is capable of reciprocating in the forward and backward directions of the material (S), and the sub-spindle 22 is capable of reciprocating in the forward and backward and left and right directions of the material (S).

The turning unit 23 may include a plurality of tool bars, including a front tool bar 231 for processing the front surface of the material S, and a side tool bar 232 for processing the side surface of the material S. It may include a rear tool stand 233 for processing the rear surface of the material (S).

Since the main spindle 21, sub-spindle 22, and turning unit 23 have generally known configurations, their detailed description will be omitted.

The hob processing unit 24 performs the most generalized gear cutting process (a process for processing basic gear teeth) (also called hobbing processing).

Referring to FIGS. 3 and 4, the hob processing unit 24 is disposed above the main spindle 21 at a certain height and is a hob head movable in the X, Y, and Z directions with respect to the main spindle 21. (241); A hob mechanism 242 mounted on the hob head 241; And it may include an angle adjuster 243 for adjusting the angle of the hob mechanism 242 during hob processing.

The hob mechanism 242 is installed at the bottom of the hob head 2410 and may be made of a cutting edge made of high-speed steel.

The hob mechanism 242 uses relatively inexpensive materials to reduce processing difficulty. For example, high-speed steel or high-carbon steel is used as the main body material of the hob mechanism, and then tungsten material with high hardness is used as the cutting edge. It can be made with materials.

The angle adjuster 243 is installed on one side of the hob head 2410 and is configured to adjust the angle of the hob mechanism 242.

Here, the direction, and the Z direction may be the direction in which the material (S) is transported, that is, in the direction of the central axis of the main spindle 21 and the sub spindle 22.

Therefore, the CNC automatic complex lathe according to the present invention has the advantage of unifying turning and hobbing processing because it is equipped with an integrated turning processing unit 23 and hobbing processing unit 24.

In other words, in the past, for the production of spur gears, the primary (turning) processing was performed in-house, and then the equipment was sent to an outsourcing partner capable of secondary (hobbing) processing in the form of intermediate processing for consignment processing, and then returned to the head office. As the process was carried out afterward, process unification can be realized by integrating this two-step process into one step.

Referring again to FIG. 2, the main body 11 is provided with a door 70 to open and close the space of the processing unit 20, and a transmission window 71 is formed in the door 70.

Preferably, the door 70 is provided so that it can be opened upward and downward with respect to the main body portion 11.

In addition, the CNC automatic complex lathe according to the present invention may further include a thermal deformation prevention unit 60 that prevents thermal deformation of the main spindle 21.

Referring to FIG. 6, the thermal deformation prevention unit 60 includes a temperature measuring unit 61 that measures the temperature of the axis of the main spindle 21; A shape measuring unit 62 that measures the shape of the main axis of the main spindle 21; a determination unit 63 that determines whether the main spindle 21 is abnormal by analyzing the measured temperature of the shaft center and the shape of the main shaft; And when an abnormal signal is input from the determination unit 63, it may include a plurality of cooling units 64 that spray fluid toward the main spindle 21 to cool the main spindle 21.

The temperature measuring unit 61, for example, is not shown in the drawing to measure the temperature of the axis of the main spindle 21, but has a length in the portion where the cooling jacket is located in the housing of the main axis of the main spindle 21. Temperature can be measured by installing thermocouples in three locations in each direction and in the front and rear bearings.

The shape measuring unit 62 is preferably an X-ray gauge.

The shape measuring unit 62 may be configured to obtain the lateral shape of the main axis of the main spindle 21.

Here, the axis of the main spindle 21 refers to the unexposed portion of the housing of the main spindle of the main spindle 21 where the cooling jacket is located, and the main axis of the main spindle 21 refers to the part exposed to the outside. It can be referred to.

The determination unit 63 analyzes the temperature of the axis of the main spindle 21 measured by the temperature measurement unit 61 and the shape measurement unit 62 and the shape of the main axis of the main spindle 21, and It is determined whether there is an abnormality in (21), for example, whether the temperature of the axis of the main spindle (21) is too high or whether the main axis of the main spindle (21) is expected to be deformed, and if so, an abnormal signal is sent to the control unit (50). It can be output as .

The control unit 50 operates the plurality of cooling units 64 in response to an abnormal signal input from the determination unit 63 to cool the main axis of the main spindle 21.

The cooling unit 64 may be arranged up and down and left and right on the side wall 12 with the main spindle 21 as the center (see FIG. 7).

Preferably, the cooling unit 64 may be placed in a location that does not interfere with the processing of the processing unit 20.

The cooling unit 64 includes a supply pipe 631 rotatably supplied with fluid from a fluid supply unit (not shown); A control unit 632 installed to adjust the amount of fluid; And it may include a spray nozzle 633 through which fluid is sprayed (see FIG. 8).

Here, the amount of fluid may be determined, for example, depending on the temperature range of the axis of the main spindle 21.

The adjustment unit 632 may include a plate member 632b whose one end is rotatably supported within the body member 632a and whose other end is configured to move toward the center of the body member 632a (see FIG. 9).

Accordingly, when the other end of the plate member 632b rotates and moves toward the center of the body member 632a, the diameter (or width) of the movement path within the body member 632a may become smaller (the amount of fluid becomes smaller).

Conversely, when the other end of the plate member 632b is returned to its original position, the diameter (or width) of the movement path within the body member 632a may increase (the amount of fluid increases).

Here, the fluid may be air or a compressed gas containing an inert gas such as nitrogen or argon, but is not necessarily limited thereto, and any other gas may be used as long as it can perform the role of a cooling fluid.

In addition, the CNC automatic complex lathe according to the present invention may further include a cutting oil supply unit 80 that supplies cutting oil to the processing unit 20, as shown in FIG. 10.

The cutting oil supply unit 80 includes an inlet 810 through which the cutting oil used in the machining process in the machining unit 20 flows; A storage unit 820 that receives cutting oil from the inlet 810 and stores it; A primary purification unit 830 that receives cutting oil from the storage unit 820 and separates metal foreign substances contained in the cutting oil; a secondary purification unit 840 that receives the cutting oil purified by the primary purification unit 830 and separates non-metallic foreign substances contained in the cutting oil; And it may include a resupply unit 850 that resupplies the cutting oil purified by the secondary purification unit 840 to the processing unit 20.

The primary purification unit 830 includes an induction tube 832 that induces adsorption of metal foreign substances; And it may include a removal unit 834 that is inserted into the guide tube 832 and removes adsorbed metal foreign substances.

Referring to FIG. 11, the induction pipe 832 may include a pipe member 832a to which metal foreign substances are adsorbed, and an electromagnet unit 832b embedded in the pipe member 832a to generate electromagnetic force.

The removal unit 834 may include a rod member 834a that removes metal foreign substances by scraping or pushing them out, and a cylinder member 834b that moves the rod member 834a.

Preferably, when the rod member 834a of the removal unit 834 is inserted into the pipe member 832a of the guide pipe 832 to remove metal foreign substances, the current supplied to the electromagnet unit 832b is blocked. do.

The secondary purification unit 840 has a shape whose diameter becomes smaller as it approaches the lower opening from the upper opening.

The secondary purification unit 840 is configured with a header part 842 that allows cutting oil to flow in through the inflow line 841 and rotates the introduced cutting oil to make a turning movement, and the cutting oil separated from the header part 842 is formed. is discharged to the resupply unit 850 through the discharge line 843, and the separated foreign matter may be discharged to the foreign matter discharge unit 860 through the discharge port 844 formed at the bottom.

Therefore, the present invention has the advantage of enabling recycling of cutting oil by including the primary purification unit 830 and the secondary purification unit 840.

Figure 12 is a diagram showing the economic performance according to the present invention.

Referring to Figure 12a, it can be seen that according to the CNC composite automatic lathe according to the present invention, productivity increased by about 150%, market share increased by 25%, and sales increased by about 380%. In addition, there was an increase of about 9% in job creation.

Referring to Figure 12b, it can be seen that the defect rate has been reduced by about 85%, and the daily production quantity has also increased by more than 150%.

Figures 13 and 14 are diagrams to explain the advantages of the CNC complex automatic lathe according to the present invention.

In the present invention, by unifying the production process such as turning and hob processing, the entire process is performed independently, eliminating the need for secondary work that requires logistics movement for each process or re-set-up for each process, eliminating unnecessary work. A high level of cost competitiveness can be secured by reducing management labor costs, rework costs, and additional inspection costs.

In addition to existing sun gears (spur gears), customers related to special gears including helical gears can expect to see a diversification of product lines that can be developed, such as helical gears, as all processes can be performed in-house when improving existing products or developing new specifications. In addition, it is expected that many opportunities will be secured to improve global sales through secured cost competitiveness and improved quality.

Referring to Figures 13 and 14, in the present invention, productivity can be improved by integrating (unifying) the turning and hob machining processes, and dimensional defects and quality problems due to mismatch in set-up conditions due to the attachment and detachment of parts in the existing separation process are eliminated. This is fundamentally solved, and production costs can be reduced through integration (unification) of the processing process.

In other words, in the present invention, when manufacturing a sun gear (spur gear), in the case of an existing composite automatic lathe, only the primary (turning) machining process can be performed, so the secondary (hob) machining process is separated and outsourced machining is performed. By integrating the turning and hob processing departments into one, the head office can perform all processing in-house without outsourcing it. This can significantly reduce production lead time, thereby securing cost competitiveness, as well as securing a high level of quality and shortening delivery times.

A person skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. The scope of the present invention is indicated by the scope of the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. must be interpreted.

10: Material supply department
20: processing unit
21: main spindle
22: Sub spindle
23: Turning processing part
24: Hob processing part
30: Key control unit
40: display unit
50: control unit
60: Heat deformation prevention unit

Claims (7)

A material supply unit provided on one side of the main body to supply material;
a processing unit that processes the material transferred from the supply unit;
A key operation unit that selects the operation of the processing unit;
A display unit that displays the operating status of the processing unit; and
It includes a control unit that controls the operation of the material supply unit, the processing unit, the key operation unit, and the display unit, and the processing unit,
Main spindle and sub spindle for transporting or supporting materials;
a turning unit that performs turning of the material; and
Equipped with a hob processing unit that performs hob processing of the material,
The hob processing unit is disposed above the main spindle at a certain height,
a hob head movable in X, Y and Z directions with respect to the main spindle;
a hob mechanism mounted on the hob head; and
It includes an angle adjuster for adjusting the angle of the hob mechanism during hob processing,
It further includes a thermal deformation prevention part that prevents thermal deformation of the main spindle, and the thermal deformation prevention part,
a temperature measuring unit that measures the temperature of the axis of the main spindle;
a shape measuring unit that measures the shape of the main axis of the main spindle;
a determination unit that determines whether the main spindle is abnormal by analyzing the measured temperature of the shaft center and the shape of the main shaft; and
When an abnormal signal is input from the determination unit, it includes a plurality of cooling units that spray fluid toward the main spindle to cool the main spindle,
The cooling unit is disposed up and down and left and right on the side wall centered on the main spindle,
A supply pipe that supplies fluid from a fluid supply unit and is rotatably installed;
A control unit installed to adjust the amount of fluid; and
It includes a spray nozzle through which fluid is sprayed,
The adjustment unit includes a pair of plate members, one end of which is rotatably supported within the body member and the other end of which is configured to move toward the center of the body member,
The main body is provided with a door to open and close the space of the processing unit, the door has a transparent window, and the door is configured to open upward and downward with respect to the main body. Turning and hob processing are unified. CNC composite automatic lathe. delete delete delete delete According to paragraph 1,
It further includes a cutting oil supply unit that supplies cutting oil to the machining unit, and the cutting oil supply unit,
an inlet into which cutting oil used in the machining process in the machining unit flows;
a storage unit that receives cutting oil from the inflow unit and stores it;
A primary purification unit that receives cutting oil from the storage unit and separates metal foreign substances contained in the cutting oil;
a secondary purification unit that receives the cutting oil purified by the primary purification unit and separates non-metallic foreign substances contained in the cutting oil; and
It includes a resupply unit that resupplies the cutting oil purified by the secondary purification unit to the processing unit,
The first purification unit is,
A guide tube that induces adsorption of metal foreign substances; and
A CNC composite automatic lathe with integrated turning and hobbing, characterized in that it includes a removal unit that is inserted into the guide tube and removes adsorbed metal foreign substances. According to clause 6,
The secondary purification unit has a diameter that becomes smaller as it approaches the lower opening from the upper opening, and is composed of a cyclone purifying unit that receives cutting oil from the primary purifying unit and removes non-metallic foreign substances through centrifugation and oil-water separation. A CNC composite automatic lathe with integrated turning and hob processing.