Auto dressing apparatus for superabrasive wheel of machine tools and auto dressing method

Abstract

The present invention relates to an auto dressing apparatus for a superabrasive wheel of machine tools and an auto dressing method, wherein, when dressing the superabrasive wheel, a dressing reference position is automatically corrected and calculated according to measured values of a dressing wheel and measurements of the superabrasive wheel, and the superabrasive wheel is automatically dressed by moving a polishing spindle to the dressing reference position such that dressing is performed within a single machine tool without moving the superabrasive wheel to a separate dressing device, thus saving dressing time and costs, improving processing precision and quality through accurate dressing, maximizing productivity by reducing non-processing time, and improving safety and convenience for operators.

Description

Automatic dressing device and automatic dressing method for super-abrasive wheels of machine tools

[0001] The present invention relates to an automatic dressing device and an automatic dressing method for an ultra-abrasive wheel of a machine tool, and more particularly, to an automatic dressing device and an automatic dressing method for an ultra-abrasive wheel of a machine tool, which can automatically perform dressing of an ultra-abrasive wheel within a single identical machine tool without moving the ultra-abrasive wheel to a separate dressing device to perform the dressing operation.

[0002] In general, a machine tool refers to a machine used for the purpose of processing a metal / non-metal workpiece into a desired shape and size using an appropriate tool using various cutting or non-cutting processing methods.

[0003] Various types of machine tools, including turning centers, vertical / horizontal machining centers, gate-type machining centers, Swiss turns, electrical discharge machines, horizontal NC boring machines, and CNC lathes, are widely used in various industrial fields for their respective tasks.

[0004] In addition, the machine tool is equipped with a table on which the workpiece material is placed and transferred for processing the workpiece, a pallet for preparing the workpiece before processing, a spindle on which a tool or workpiece is combined and rotates, a tailstock for supporting the workpiece during processing, a vibration damper, etc.

[0005] Typically, machine tools have a feed system that moves the table, tool rest, spindle, tailstock, and steady rest along axes to perform various machining operations. Depending on the machine tool type, this feed system can be configured in various configurations, such as two-axis, three-axis, four-axis, or five-axis.

[0006] Additionally, machine tools generally use multiple tools for various processing operations, and tool magazines or turrets are used as tool storage spaces for storing multiple tools.

[0007] Additionally, machine tools are generally equipped with an automatic tool changer (ATC) to retrieve or retract a specific tool from the tool magazine under the command of the numerical control unit in order to improve the productivity of the machine tool.

[0008] Additionally, machine tools are typically equipped with an automatic pallet changer (APC) to minimize downtime. The APC automatically exchanges pallets between the workpiece processing area and the workpiece installation area. Pallets can be loaded with workpieces.

[0009] Numerical control (NC) is rapidly advancing in various types of machine tools currently in use.

[0010] Recently, machine tools equipped with computer numerical control (CNC) technology, which is a further development of numerical control (NC), are being rapidly distributed as computers equipped with numerical control (NC) are used to automatically control machine tools.

[0011] Numerical control (NC) or computer numerical control (CNC) machine tools are equipped with an operator panel. This panel contains various function switches or buttons and a monitor.

[0012] In this way, machine tools that use numerical control or computer numerical control move the feed system according to numerical control commands to perform processing, thereby processing the workpiece.

[0013] Additionally, numerical control (NC) machine tools generally perform machining operations such as cutting, drilling, milling, tapping, and polishing while moving workpieces and tools along the X, Y, and Z axes.

[0014] Polishing of a workpiece using an NC machine tool is performed by moving the grinding wheel while the spindle equipped with the grinding wheel rotates while the workpiece is stationary, or by moving the workpiece while the grinding wheel is mounted on the spindle and rotates.

[0015] Nowadays, there is a growing trend to use superabrasives (diamond & CBN abrasives) that have higher material removal rates, lower wheel wear rates, and produce finer surface finishes than conventional abrasives (alumina oxide abrasives) for high processing precision, mass production, and high surface finish.

[0016] In this way, abrasive wheels used in polishing processes experience accumulated micro-wear due to the interaction between abrasive particles and the workpiece during processing. That is, the particles are gradually dulled (attritious wear) by the friction between the abrasive particles and the workpiece, or when the abrasive resistance acting on the particles is excessive, particle fragments are lost due to particle destruction (grain fracture), or bond fracture occurs.

[0017] In particular, in superabrasives, bond fracture often occurs rather than particle fracture due to the grinding resistance. When the bond fractures, the particles it supported fall out.

[0018] Since the price of super-abrasive (Diamond & CBN) wheels is higher than that of conventional abrasives (Alumina Oxide Abrasives), wheel wear is important in the case of medium grinding as the wear rate of the wheel increases.

[0019] As maintenance costs due to wear of superabrasive wheels increase, interest in dressing for reuse of superabrasive wheels is also increasing.

[0020] Dressing is generally classified into wheel conditioning and is further divided into dressing and cleaning.

[0021] In other words, dressing is the process of adjusting the condition of the particles to restore the grinding properties of the grinding particles and protruding abrasive grains on the wheel surface.

[0022] In conventional machine tools, the super-abrasive wheel was removed from the spindle, dressed in a separate device, and then remounted onto the spindle of the machine tool.

[0023] Accordingly, there were problems in that dressing of super-abrasive wheels took a lot of time and cost, caused inconvenience to workers, and reduced productivity due to increased non-processing time.

[0024] In addition, there was a problem that the equipment was damaged due to collisions caused by falling of the super-abrasive wheel during the process of moving the super-abrasive wheel to a separate dressing device, which increased maintenance costs and time and caused safety accidents.

[0025] Moreover, the dressing work of conventional super-abrasive wheels was performed by relying on the operator's intuition without performing automatic measurement or gauging of the super-abrasive wheel and dressing wheel before and during the dressing work, which resulted in a decrease in dressing precision, a decrease in safety and reliability, and a decrease in the processing quality of the workpiece.

[0026] The present invention is to solve the above problems, and the purpose of the present invention is to automatically correct and calculate the dressing reference position according to the measurement value of the dressing wheel and the measurement value of the super-abrasive wheel when dressing the super-abrasive wheel, and to automatically perform the dressing of the super-abrasive wheel by moving the grinding spindle to the dressing reference position, thereby reducing the dressing time and cost by performing the dressing within one identical machine tool equipment without moving the super-abrasive wheel to a separate dressing equipment, improving the processing precision and quality through accurate dressing work, maximizing the productivity by reducing the non-processing time, and providing an automatic dressing device and automatic dressing method for a super-abrasive wheel of a machine tool that can improve the safety and convenience of the operator.

[0027] In order to achieve the object of the present invention, an automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention may include: a main shaft that clamps and rotates a workpiece; a grinding spindle movably arranged inside a housing; an automatic tool exchange unit having a magazine that stores a plurality of tools for processing the workpiece and an exchange unit that automatically exchanges the tools stored in the magazine with the grinding spindle; a super-abrasive wheel that is detachably mounted on the grinding spindle through the automatic tool exchange unit and that grinds and processes the workpiece; a dressing spindle that is fixedly arranged on a portion of the housing unit; a dressing wheel that is rotatably mounted on the dressing spindle and dresses the super-abrasive wheel; a measuring unit that is detachably mounted on the grinding spindle through the automatic tool exchange unit and measures the dressing wheel; a measuring unit that is disposed on a portion of the housing unit and measures the super-abrasive wheel; and a control unit that controls the operation order and operation status of the main shaft, the grinding spindle, the automatic tool exchange unit, the dressing spindle, the measuring unit, and the measuring unit to automatically dress the super-abrasive wheel.

[0028] In addition, in another preferred embodiment of the automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention, the control unit of the automatic dressing device for a super-abrasive wheel of a machine tool can automatically correct and calculate a dressing reference position according to a measurement value of the dressing wheel and a measurement value of the super-abrasive wheel when dressing the super-abrasive wheel, and move the polishing spindle to the dressing reference position to automatically perform dressing of the super-abrasive wheel.

[0029] In addition, in another preferred embodiment of the automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention, the measuring unit of the automatic dressing device for a super-abrasive wheel of a machine tool can measure the diameter and width of the dressing wheel by moving the polishing spindle to the dressing wheel while the polishing spindle is automatically exchanged and mounted on the polishing spindle through the automatic tool exchange unit under the control of the control unit.

[0030] In addition, in another preferred embodiment of the automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention, the measuring unit of the automatic dressing device for a super-abrasive wheel of a machine tool is fixedly disposed adjacent to the main shaft, and the measuring unit can measure the diameter and width of the super-abrasive wheel as the polishing spindle moves adjacent to the measuring unit while the super-abrasive wheel is automatically exchanged and mounted on the polishing spindle through the automatic tool exchange unit under the control of the control unit.

[0031] In addition, in another preferred embodiment of the automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention, the control unit of the automatic dressing device for a super-abrasive wheel of a machine tool can perform the cutting dressing by moving the grinding spindle in the first direction at a predetermined cutting amount while determining the rotational direction of the dressing spindle and the grinding spindle and rotating them while the grinding spindle and the dressing wheel are in contact at a dressing reference position when performing the dressing of the super-abrasive wheel.

[0032] In addition, in another preferred embodiment of the automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention, the control unit of the automatic dressing device for a super-abrasive wheel of a machine tool can perform travel dressing by moving the polishing spindle so that the super-abrasive wheel repeatedly deviates from the dressing wheel in a preset second direction when performing in-cut dressing while moving the polishing spindle in a first direction.

[0033] In addition, in another preferred embodiment of the automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention, the control unit of the automatic dressing device for a super-abrasive wheel of a machine tool, when the cutting dressing and travel dressing of the super-abrasive wheel are completed, re-measures the diameter and width of the super-abrasive wheel with the measuring unit to determine whether the super-abrasive wheel is completed at a predetermined cutting amount, and if the determination result is abnormal, re-dressing can be performed.

[0034] In addition, in another preferred embodiment of the automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention, the automatic dressing device for a super-abrasive wheel of a machine tool may further include a dressing pad installed inside the housing portion.

[0035] In addition, in another preferred embodiment of the automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention, the automatic dressing device for a super-abrasive wheel of a machine tool may further include a coolant shower unit installed inside the housing unit and spraying coolant before or after dressing completion under the control of the control unit.

[0036] In order to achieve another object of the present invention, an automatic dressing method for a super-abrasive wheel of a machine tool according to the present invention may include the steps of: storing data for automatically dressing a super-abrasive wheel; measuring a dressing wheel mounted on a dressing spindle; measuring a super-abrasive wheel; correcting and calculating a dressing reference position based on a dressing wheel measurement value, a measurement value of the super-abrasive wheel, and pre-stored data; moving a grinding spindle to a dressing reference position; determining and rotating the rotational directions of the dressing spindle and the grinding spindle; performing in-cut dressing of the super-abrasive wheel by moving the grinding spindle in a first direction; and performing travel dressing by moving the grinding spindle so that the super-abrasive wheel repeatedly deviates from the dressing wheel in a preset second direction.

[0037] In addition, in another preferred embodiment of the automatic dressing method for a super-abrasive wheel of a machine tool according to the present invention, the automatic dressing method for a super-abrasive wheel of a machine tool may further include a step of spraying a coolant after the step of determining the rotational direction of the dressing spindle and the polishing spindle and rotating them.

[0038] In addition, in another preferred embodiment of the automatic dressing method for a super-abrasive wheel of a machine tool according to the present invention, the automatic dressing method for a super-abrasive wheel of a machine tool may further include a step of determining whether dressing of the super-abrasive wheel with a pre-stored cutting amount has been completed after the step of performing the travel dressing.

[0039] The automatic dressing device and automatic dressing method for a super-abrasive wheel of a machine tool according to the present invention have the effect of reducing dressing time and cost by performing dressing within one identical machine tool without moving the super-abrasive wheel to a separate dressing device and performing the dressing work, and improving productivity by reducing non-processing time.

[0040] In addition, the automatic dressing device and automatic dressing method for a super-abrasive wheel of a machine tool according to the present invention automatically correct and calculate a dressing reference position according to the measurement value of the dressing wheel and the measurement value of the super-abrasive wheel when dressing the super-abrasive wheel, and automatically perform dressing of the super-abrasive wheel by moving the grinding spindle to the dressing reference position, thereby having the effect of improving processing precision and processing quality through accurate dressing work.

[0041] Furthermore, the automatic dressing device and automatic dressing method for a super-abrasive wheel of a machine tool according to the present invention improve the convenience of the operator by performing automatic dressing of a super-abrasive wheel in one machine tool equipment, prevent safety accidents occurring during the movement of the super-abrasive wheel, thereby ensuring the safety of the operator, and have the effect of maximizing the safety and reliability of the machine tool.

[0042] Figure 1 illustrates a conceptual diagram of an automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention.

[0043] Figure 2 is a conceptual diagram showing a state in which a measuring unit is mounted on a grinding spindle of an automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention.

[0044] Figure 2 is a conceptual diagram showing a state in which a measuring unit of an automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention is mounted.

[0045] Figure 4 shows a conceptual diagram of a state before movement of a grinding spindle in a state where an ultra-abrasive wheel is mounted on the grinding spindle of an automatic dressing device for an ultra-abrasive wheel of a machine tool according to the present invention.

[0046] Figure 5 is a conceptual diagram showing a state in which the polishing spindle of the automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention is moved to a dressing reference position with the super-abrasive wheel mounted on the polishing spindle.

[0047] Figure 6 shows a conceptual diagram of a process for dressing a super-abrasive wheel into a grinding spindle of an automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention.

[0048] Figures 7 and 8 illustrate a conceptual diagram of a travel dressing process of an ultra-abrasive wheel on a grinding spindle of an automatic dressing device for an ultra-abrasive wheel of a machine tool according to the present invention.

[0049] Figures 9 and 10 show examples of screens of a control unit of an automatic dressing device for a super-abrasive wheel of a machine tool according to one embodiment of the present invention.

[0050] Figure 11 shows a procedure diagram of an automatic dressing method for a super-abrasive wheel of a machine tool according to the present invention.

[0051] Hereinafter, an automatic dressing device and automatic dressing method for a superabrasive wheel of a machine tool according to an embodiment of the present invention will be described in detail with reference to drawings. The embodiments introduced below are provided as examples to ensure that the spirit of the present invention can be sufficiently conveyed to those skilled in the art. Therefore, the present invention is not limited to the embodiments described below and may be embodied in other forms. In addition, in the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numbers represent like elements throughout the specification.

[0052] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification. The sizes and relative sizes of layers and regions in the drawings may be exaggerated for clarity of description.

[0053] The terminology used herein is for the purpose of describing embodiments and is therefore not intended to be limiting of the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise. As used herein, the terms "comprise" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, operations, and / or elements mentioned.

[0054] FIG. 1 illustrates a conceptual diagram of an automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention. FIG. 2 illustrates a conceptual diagram of a state in which a measuring unit is mounted on a grinding spindle of an automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention. FIG. 2 illustrates a conceptual diagram of a state in which a measuring unit is mounted on a grinding spindle of an automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention. FIG. 4 illustrates a conceptual diagram of a state before movement of a grinding spindle of an automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention, with a super-abrasive wheel mounted on the grinding spindle. FIG. 5 illustrates a conceptual diagram of a state in which a grinding spindle of an automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention has moved to a dressing reference position. FIG. 6 illustrates a conceptual diagram of a process for in-feed dressing of a super-abrasive wheel on a grinding spindle of an automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention. FIGS. 7 and 8 illustrate conceptual diagrams of a process for travel dressing of a super-abrasive wheel on a grinding spindle of an automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention. Figures 9 and 10 illustrate screen examples of a control unit of an automatic dressing device for a super-abrasive wheel of a machine tool according to one embodiment of the present invention. Figure 11 illustrates a flow chart of a method for automatically dressing a super-abrasive wheel of a machine tool according to the present invention.

[0055] Referring to FIGS. 1 to 10, an automatic dressing device (1) for a super-abrasive wheel of a machine tool according to the present invention is described. As illustrated in FIGS. 1 to 10, an automatic dressing device (1) for a super-abrasive wheel of a machine tool according to the present invention includes a main shaft (10), a grinding spindle (20), an automatic tool changer (30), a super-abrasive wheel (40), a dressing spindle (50), a dressing wheel (60), a measuring unit (70), a measurement unit (80), a control unit (90), a dressing pad (100), and a coolant shower unit (110).

[0056] The spindle (10) clamps and rotates the workpiece. Although the spindle is depicted as being fixed in FIGS. 1 to 10, this is not necessarily the case, and the spindle may also be arranged to be movable within the housing portion (2) of the machine tool.

[0057] The polishing spindle (20) is movably arranged inside the housing (2). That is, the polishing spindle is arranged to be movable in the length, width, and height directions inside the housing under the control of the control unit, and processes the workpiece mounted on the main shaft with an ultra-abrasive wheel.

[0058] The automatic tool exchange unit (30) has a magazine (31) that stores a plurality of tools for processing the workpiece and an exchange unit (32) that automatically exchanges the tools stored in the magazine with the grinding spindle.

[0059] That is, a magazine storing multiple tools is fixedly installed on one side of the machine tool, and an exchange unit moves between the magazine and the grinding spindle or the magazine and the main shaft to transfer the tools.

[0060] According to one embodiment of the present invention, the exchange unit may be formed as a gantry loader.

[0061] The super-abrasive wheel (40) is detachably mounted on the polishing spindle through the automatic tool changer to polish and process the workpiece. Although not necessarily limited thereto, the super-abrasive wheel is formed of super-abrasives (diamond & CBN abrasives).

[0062] The dressing spindle (50) is fixedly positioned on a part of the housing portion.

[0063] The dressing wheel (60) is rotatably mounted on the dressing spindle and dresses the super-abrasive wheel.

[0064] The measuring unit (70) is detachably mounted on the polishing spindle through the automatic tool exchange unit and measures the dressing wheel.

[0065] The measuring unit of the automatic dressing device of the super-abrasive wheel of the machine tool according to the present invention automatically exchanges and mounts the polishing spindle through the automatic tool exchange unit under the control of the control unit, and moves the polishing spindle to the dressing wheel to measure the diameter and width of the dressing wheel.

[0066] The measuring unit (80) is placed in a part of the housing unit and measures the super-abrasive wheel.

[0067] According to one embodiment of the present invention, the measuring unit is fixedly positioned adjacent to the main shaft. The fixed positioning of the measuring unit minimizes the travel path, thereby reducing measurement time and thus saving time and cost.

[0068] The measuring unit of the automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention measures the diameter and width of the super-abrasive wheel as the polishing spindle moves adjacent to the measuring unit while the super-abrasive wheel is automatically exchanged and mounted on the polishing spindle through the automatic tool exchange unit under the control of the control unit.

[0069] Although not necessarily limited thereto, the measuring unit according to one embodiment of the present invention may be formed as an NC4 non-contact measuring device.

[0070] The control unit (80) automatically dresses the super-abrasive wheel by controlling the operating order and operation of the main shaft, the polishing spindle, the automatic tool changer, the dressing spindle, the measuring unit, and the measurement unit.

[0071] In this way, the automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention performs dressing within a single identical machine tool without moving the super-abrasive wheel to a separate dressing device, thereby reducing dressing time and cost and improving productivity by reducing non-processing time.

[0072] In addition, the control unit of the automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention automatically corrects and calculates a dressing reference position according to the measurement value of the dressing wheel and the measurement value of the super-abrasive wheel when dressing the super-abrasive wheel, and moves the polishing spindle to the dressing reference position to automatically perform dressing of the super-abrasive wheel.

[0073] Accordingly, the automatic dressing device for a super-abrasive wheel of a machine tool according to the present invention improves processing precision and processing quality through accurate dressing work, improves operator convenience by performing automatic dressing of a super-abrasive wheel in a single machine tool equipment, prevents safety accidents occurring during the movement of a super-abrasive wheel, thereby ensuring operator safety and maximizing the safety and reliability of the machine tool.

[0074] Additionally, these control units include NC (numerical control) or CNC (computerized numerical control) and have various numerical control programs built in.

[0075] In addition, although not shown in the drawing, according to a preferred embodiment of the present invention, the control unit includes a main operation unit and a display unit, and the main operation unit includes a screen display program and a data input program according to screen display selection, and performs a function of displaying a software switch on a display screen according to an output of the screen display program, and recognizing the on / off of the software switch to issue an input / output command for machine operation.

[0076] Additionally, the control unit may be equipped with a database unit for storing necessary programs or data.

[0077] Such database unit may be a variety of storage devices such as ROM, RAM, EPROM, flash drive, hard drive, etc., and may also be web storage that performs the storage function of data storage unit on the Internet.

[0078] In a database section of an automatic dressing device for a super-abrasive wheel of a machine tool according to one embodiment of the present invention, data on grinding spindle reference data (D), dressing spindle reference data (B), measurement information of a measuring unit, measurement information of a measuring unit, rotational direction information of a dressing spindle and a grinding spindle, maximum cutting amount according to workpiece type, processing type, and super-abrasive grinding material type, cutting dressing first direction (F) information, target cutting amount (F1), travel dressing second direction (T) information, travel dressing pattern information, etc. can be stored.

[0079] The polishing spindle reference data and the dressing spindle reference data can be stored in the form of machine origin reference coordinate data of the polishing spindle and the dressing spindle, respectively.

[0080] In this way, the control unit calculates and corrects the dressing reference position in real time based on the data stored in the database unit, the measurement data of the measurement unit, and the measurement data of the instrumentation unit, and automatically performs the dressing operation based on the target depth of cut and the travel dressing pattern in the depth of cut dressing direction and travel dressing direction stored in the database unit while moving the polishing spindle to the calculated dressing reference position.

[0081] These displays can display current dressing information, operating status of the grinding spindle, dressing spindle, automatic tool changer, and infeed dressing and travel dressing information.

[0082] The display unit may include at least one of a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), a flexible display, a 3D display, and an e-ink display.

[0083] In addition, although not necessarily limited thereto, the display unit may be formed in the form of a touch screen and installed on the housing, case, or one side of the machine tool to display various function switches or buttons and various types of information.

[0084] In this way, as various statuses are displayed on the display, the user or operator can check the current operating status and equipment status of the machine tool in real time, thereby preventing collisions or damage or breakage of the super-abrasive wheel or dressing wheel in advance, thereby reducing maintenance costs and time, preventing safety accidents, and preparing for sudden accidents through alarms, etc.

[0085] A dressing pad (100) is installed inside the housing portion. Although not necessarily limited thereto, the dressing pad is installed inside the housing adjacent to the dressing wheel.

[0086] Accordingly, the super-abrasive wheel is mounted on the grinding spindle and moved to the dressing pad after dressing with the dressing wheel, thereby quickly and easily performing the finishing dressing operation, thereby reducing dressing time and cost and improving productivity by reducing non-processing time.

[0087] The coolant shower unit (110) is installed inside the housing unit and sprays coolant before or after dressing is completed according to the control of the control unit.

[0088] If there is foreign matter on the dressing wheel or super-abrasive wheel before dressing, uniform dressing cannot be performed, and in severe cases, the super-abrasive wheel or dressing wheel may be damaged during dressing. Therefore, coolant is sprayed through the coolant shower before dressing is completed to prevent this in advance.

[0089] In addition, in order to prevent the uniformity of surface roughness, etc. from deteriorating during machining and resulting in poor machining quality when there are foreign substances on the workpiece or super-abrasive wheel after the dressing operation, coolant is sprayed through the coolant shower unit after the dressing operation to prevent this in advance.

[0090] The automatic dressing principle according to the present invention is explained with reference to FIGS. 1 to 10.

[0091] Polishing is performed with the workpiece mounted on the main shaft and an ultra-abrasive wheel mounted on the polishing spindle.

[0092] As shown in FIGS. 1 to 3, when dressing of the super-abrasive wheel is required during polishing, the exchange unit detaches the super-abrasive wheel mounted on the polishing spindle and moves it to the magazine for storage under the control of the control unit, and the exchange unit mounts the measuring unit stored in the magazine on the polishing spindle.

[0093] The measuring unit is automatically exchanged and mounted on the polishing spindle through the automatic tool change unit under the control of the control unit, and the polishing spindle moves to the dressing wheel to measure the diameter and width of the dressing wheel. That is, the polishing spindle equipped with the measuring unit moves to the dressing spindle to measure the diameter and width of the dressing wheel.

[0094] Afterwards, the exchange unit removes the measuring unit mounted on the polishing spindle and moves it to the magazine for storage, and the exchange unit mounts the super-abrasive wheel stored in the magazine onto the polishing spindle.

[0095] Thereafter, as shown in FIGS. 1, 3 to 5, the measuring unit measures the diameter and width of the super-abrasive wheel as the polishing spindle moves in the horizontal direction (Z) and the vertical direction (X) so as to be adjacent to the measuring unit while the super-abrasive wheel is automatically exchanged and mounted on the polishing spindle through the automatic tool exchange unit under the control of the control unit. That is, the polishing spindle equipped with the super-abrasive wheel moves to the measuring unit to measure the diameter and width of the dressing wheel of the super-abrasive wheel.

[0096] Thereafter, as shown in Fig. 5, when dressing the super-abrasive wheel, the dressing reference position is automatically corrected and calculated based on the measurement value of the dressing wheel and the measurement value of the super-abrasive wheel.

[0097] That is, the dressing reference position (D) is automatically corrected and calculated based on the measurement information of the diameter and width of the dressing wheel measured through the measuring unit and the pre-stored dressing spindle reference data (B) and the measurement information of the diameter and width of the super-abrasive wheel measured through the measuring unit and the pre-stored polishing spindle reference data (D).

[0098] Thereafter, as shown in FIG. 6 and FIG. 9 to FIG. 10, the polishing spindle is moved to the dressing reference position under the control of the control unit to automatically perform dressing of the super-abrasive wheel.

[0099] At this time, the control unit determines the rotational direction of the dressing spindle and the polishing spindle while the polishing spindle and the dressing wheel are in contact at the dressing reference position when performing dressing of the super-abrasive wheel, and moves the polishing spindle in the first direction (F) at a predetermined cutting amount while rotating the polishing spindle to perform cutting dressing.

[0100] That is, when performing super-abrasive wheel dressing, the control unit determines the rotational direction of the dressing spindle and the polishing spindle according to the stored data while the super-abrasive wheel (40) and the dressing wheel (60) are in contact at the dressing reference position, and moves them in the first direction (F1) and the stored target cutting amount (F1) to perform cutting dressing.

[0101] Thereafter, as shown in FIGS. 7 to 8 and 10 to 11, the control unit performs travel dressing by moving the polishing spindle in the first direction so that the super-abrasive wheel repeatedly deviates from the dressing wheel in a preset second direction while performing in-cut dressing.

[0102] That is, when the control unit performs the in-cut dressing while moving the polishing spindle in the first direction (F), the super-abrasive wheel (40) moves the polishing spindle in the preset second direction (T) so that the dressing wheel repeatedly deviates according to the pre-stored travel dressing pattern information (T1, T2) to perform the travel dressing.

[0103] Thereafter, when the cutting dressing and travel dressing of the super-abrasive wheel are completed, the control unit re-measures the diameter and width of the super-abrasive wheel with the measuring unit to determine whether the super-abrasive wheel is completed at a predetermined cutting amount, and if the determination result is abnormal, re-dressing is performed.

[0104] That is, after the cutting dressing and travel dressing are completed, the diameter and width of the super-abrasive wheel are re-measured by the measuring unit, and the dressing of the super-abrasive wheel is compared to determine whether the dressing is completed according to the stored target cutting amount. If the dressing is performed according to the target cutting amount, the dressing is terminated, and if the dressing is not performed according to the target cutting amount, re-dressing is performed in the same manner.

[0105] In this way, the automatic dressing device and automatic dressing method for a super-abrasive wheel of a machine tool according to the present invention automatically perform dressing of a super-abrasive wheel in one machine tool, and additionally perform measurement of the super-abrasive wheel after dressing to perform dressing with an accurate dressing amount, thereby improving dressing quality, ultimately maximizing processing quality, and preventing waste of resources.

[0106] Referring to Fig. 11, the automatic dressing method for a super-abrasive wheel of a machine tool according to the present invention will be described. As shown in Fig. 11, the automatic dressing method for a super-abrasive wheel of a machine tool according to the present invention comprises a data storage step (S1), a dressing wheel measurement step (S2), a super-abrasive wheel measurement step (S3), a dressing reference position correction and calculation step (S4), a grinding spindle dressing reference position movement step (S5), a dressing spindle and a grinding spindle rotation direction determination and rotation step (S6), a coolant injection step (S7), a cutting dressing step (S8), a travel dressing step (S9), and a judgment step (S10). In each step, the specific control process or control principle and the configuration or content of the device are the same as those of the automatic dressing device for a super-abrasive wheel of a machine tool of the specification of the present invention, and thus, the following description will focus on the unique points of the automatic dressing method for a super-abrasive wheel of a machine tool with reference to Fig. 11.

[0107] Stores data for automatically dressing superabrasive wheels.

[0108] After the data storage step (S1), the dressing wheel mounted on the dressing spindle is measured by a measuring instrument.

[0109] After the dressing wheel measurement step (S2), the super-abrasive wheel is measured by a measuring instrument.

[0110] After the super-abrasive wheel measurement step (S3), the dressing reference position is corrected and calculated based on the dressing wheel measurement value, the super-abrasive wheel measurement value, and the previously stored data.

[0111] After the dressing reference position correction and calculation step (S4), the polishing spindle is moved to the dressing reference position.

[0112] After the polishing spindle dressing reference position movement step (S5), the rotational direction of the dressing spindle and the polishing spindle is determined and rotated.

[0113] After the dressing spindle and polishing spindle rotation direction determination and rotation step (S6), coolant is sprayed.

[0114] After the coolant injection step (S7), the polishing spindle moves in the first direction to perform insertion dressing of the super-abrasive wheel.

[0115] After the cutting dressing step (S8), the travel dressing is performed by moving the polishing spindle so that the super-abrasive wheel repeatedly moves off the dressing wheel in a preset second direction.

[0116] After the travel dressing step (S9), it is determined whether the dressing of the super-abrasive wheel has been completed with the preset cutting depth.

[0117] If there is no abnormality in the judgment result, the dressing is terminated. If there is an abnormality, the above-described process is repeated to perform re-dressing.

[0118] The automatic dressing device and automatic dressing method for a super-abrasive wheel of a machine tool according to the present invention can reduce dressing time and cost by performing dressing within one identical machine tool without moving the super-abrasive wheel to a separate dressing device and performing dressing work, and can improve productivity by reducing non-processing time.

[0119] In addition, the automatic dressing device and automatic dressing method for a super-abrasive wheel of a machine tool according to the present invention automatically correct and calculate a dressing reference position according to the measurement value of the dressing wheel and the measurement value of the super-abrasive wheel when dressing the super-abrasive wheel, and automatically perform dressing of the super-abrasive wheel by moving the grinding spindle to the dressing reference position, thereby improving processing precision and processing quality through accurate dressing work.

[0120] Furthermore, the automatic dressing device and automatic dressing method for a superabrasive wheel of a machine tool according to the present invention can improve the convenience of a worker by performing automatic dressing of a superabrasive wheel in one machine tool equipment, prevent safety accidents occurring during the movement of the superabrasive wheel, thereby ensuring the safety of the worker and maximizing the safety and reliability of the machine tool.

[0121] Although the detailed description of the present invention described above has been described with reference to preferred embodiments of the present invention, it will be understood by those skilled in the art or having ordinary knowledge in the art that various modifications and changes can be made to the present invention without departing from the spirit and technical scope of the present invention as set forth in the claims below. Accordingly, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

[0122] <Explanation of symbols>

[0123] 1: Automatic dressing device for super-abrasive wheel

[0124] 10: Main axis

[0125] 20: Polishing spindle

[0126] 30: Automatic tool changer

[0127] 40: Super abrasive wheel

[0128] 50: Dressing spindle

[0129] 60: Dressing wheel

[0130] 70: Measurement section

[0131] 80: Measurement department

[0132] 90: Control unit

[0133] 100: Dressing pad

[0134] 110: Coolant shower

Claims

1. A spindle that clamps and rotates the workpiece; A grinding spindle movably positioned inside the housing; An automatic tool exchange unit having a magazine for storing a plurality of tools for processing the workpiece and an exchange unit for automatically exchanging tools stored in the magazine with the grinding spindle; An ultra-abrasive wheel that is detachably mounted on the polishing spindle through the automatic tool exchange unit and performs polishing processing on the workpiece; A dressing spindle fixedly arranged on a part of the above housing portion; A dressing wheel rotatably mounted on the dressing spindle for dressing the super-abrasive wheel; A measuring unit that is detachably mounted on the polishing spindle through the automatic tool exchange unit and measures the dressing wheel; A measuring unit arranged in a part of the housing portion to measure the super-abrasive wheel; and An automatic dressing device for a super-abrasive wheel of a machine tool, characterized in that it includes a control unit that automatically dresses the super-abrasive wheel by controlling the operation order and operation status of the main shaft, the polishing spindle, the automatic tool changer, the dressing spindle, the measuring unit, and the measuring unit.

2. In paragraph 1, An automatic dressing device for a super-abrasive wheel of a machine tool, characterized in that the control unit automatically corrects and calculates a dressing reference position according to a measurement value of the dressing wheel and a measurement value of the super-abrasive wheel when dressing the super-abrasive wheel, and moves the polishing spindle to the dressing reference position to automatically perform dressing of the super-abrasive wheel.

3. In paragraph 2, An automatic dressing device for a super-abrasive wheel of a machine tool, characterized in that the measuring unit is automatically exchanged and mounted on the polishing spindle through the automatic tool exchange unit under the control of the control unit, and the polishing spindle moves to the dressing wheel to measure the diameter and width of the dressing wheel.

4. In paragraph 3, The above measuring unit is fixedly arranged adjacent to the main shaft, An automatic dressing device for a super-abrasive wheel of a machine tool, characterized in that the measuring unit measures the diameter and width of the super-abrasive wheel as the polishing spindle moves adjacent to the measuring unit while the super-abrasive wheel is automatically exchanged and mounted on the polishing spindle through the automatic tool exchange unit under the control of the control unit.

5. In paragraph 4, An automatic dressing device for a super-abrasive wheel of a machine tool, characterized in that the control unit determines the rotational direction of the dressing spindle and the polishing spindle while the polishing spindle and the dressing wheel are in contact at a dressing reference position when dressing the super-abrasive wheel, and moves the polishing spindle in a first direction at a predetermined cutting amount while rotating the polishing spindle to perform cutting dressing.

6. In paragraph 5, An automatic dressing device for a super-abrasive wheel of a machine tool, characterized in that the control unit performs travel dressing by moving the super-abrasive wheel so that the super-abrasive wheel repeatedly deviates from the dressing wheel in a preset second direction while performing in-cut dressing while moving the super-abrasive spindle in a first direction.

7. In paragraph 6, The above control unit re-measures the diameter and width of the super-abrasive wheel with the measuring unit when the cutting dressing and travel dressing of the super-abrasive wheel are completed, determines whether the super-abrasive wheel is completed at a predetermined cutting amount, and performs re-dressing if the determination result is abnormal. An automatic dressing device for a super-abrasive wheel of a machine tool.

8. In paragraph 1, An automatic dressing device for a super-abrasive wheel of a machine tool, characterized in that it further includes a dressing pad installed inside the housing portion.

9. In paragraph 1, An automatic dressing device for a super-abrasive wheel of a machine tool, characterized in that it further includes a coolant shower unit installed inside the housing unit and spraying coolant before or after dressing completion according to the control of the control unit.

10. Step of storing data for automatically dressing the super-abrasive wheel; A step of measuring a dressing wheel mounted on a dressing spindle; Step for measuring super abrasive wheels; A step of calculating and correcting the dressing reference position based on the dressing wheel measurement value, the super-abrasive wheel measurement value, and the stored data; Step of moving the polishing spindle to the dressing reference position; A step of determining the rotational direction of the dressing spindle and the polishing spindle and rotating them; A step of performing cutting dressing of the super-abrasive wheel by moving the polishing spindle in the first direction; and A method for automatically dressing a super-abrasive wheel of a machine tool, characterized in that it comprises a step of performing travel dressing by moving the polishing spindle so that the super-abrasive wheel repeatedly deviates from the dressing wheel in a preset second direction.

11. In paragraph 10, A method for automatically dressing a super-abrasive wheel of a machine tool, characterized in that it further includes a step of spraying coolant after the step of determining the rotational direction of the dressing spindle and the polishing spindle and rotating them.

12. In paragraph 11, A method for automatically dressing a super-abrasive wheel of a machine tool, characterized in that it further comprises a step of determining whether dressing of the super-abrasive wheel with a preset cutting depth is completed after the step of performing the above travel dressing.

Images