Tool compensation system and method for adjusting parameters of a tool

A tool compensation system for adjusting parameters of a tool includes a controller and a selecting module. The controller includes a storing module, an invoking module, and a compensation module. The storing module is configured for storing serial numbers and data tables of a first and a second tools. Each data table of the first and second tools includes a plurality of first dimensional parameters and a plurality of second dimensional parameters. The selecting module is capable of selecting a tool for machining by selecting the serial number of the tool. The invoking module is configured for invoking the second dimensional parameters according to the first dimensional parameters of a tool selected by the selecting module. The compensation module is configured for adjusting machining parameters of the selected tool according to the second dimensional parameters.

BACKGROUND

1. Technical Field

The present disclosure relates to compensation systems and methods, and particularly to a tool compensation system and a tool compensation method for adjusting parameters of a tool.

2. Description of the Related Art

In a computer numerical control (CNC) system, a tool is a significant component used for machining metal workpieces. Generally, tool wear may occur during machining processes, which may result in different size variations of the workpieces. A method of compensating for tool wear is to adjust machining parameters of the tool via a human-machine interface after each machining circle. The machining parameters of the tool are stored in a controller. However, adjusting machining parameters manually every time is time-consuming.

DETAILED DESCRIPTION

Referring toFIG. 1, an exemplary embodiment of a tool compensation system100includes a controller10and a human-machine interface20. The controller10includes a storing module11, an invoking module12, and a compensation module13. The tool compensation system100is configured for adjusting a tool cutting length according to a tool wear dimension after a machining circle for example. It may be understood that a machining circle is a machining segment with a pre-determined tool cutting length. Generally, the tool compensation system100is applied in a computer numerical control (CNC) machine, such as a CNC milling machine. The first tool30and the second tool40may be fixed to the CNC milling machine for machining the workpiece50. In one exemplary embodiment, the first tool30and the second tool40can be two milling cutters. The workpiece50can be an object made of metal for example.

The storing module11is employed to store serial numbers and data tables of the first tool30and the second tool40. The first tool30is numbered with a first serial number as K1, and the second tool40is numbered with a second serial number as K2. Each of the data tables includes a plurality of first dimensional parameters and a plurality of second dimensional parameters. For example, a wear data table includes a plurality of tool cutting lengths as the plurality of first dimensional parameters and a plurality of tool wear dimensions as the plurality of second dimensional parameters. The plurality of tool cutting lengths and the plurality of tool wear dimensions are in a one-to-one relationship. For example, a first cutting length is about 1 mm, and a corresponding first tool wear dimension is about 0.01 mm; a second cutting length is about 2 mm, and a corresponding second tool wear dimension is about 0.015, and so on. Before the workpiece50is machined in practice, the wear data tables of the first tool30and the second tool40are created and stored in the storing module11. Each tool wear dimension and the corresponding tool cutting length in the wear data tables are measured manually or by an automatic measurement system. Depending on the embodiment, the storing module may be a local cache file, a hard disk drive, a random access memory, a readable only memory, for example, but the disclosure is not limited thereto.

The human-machine interface20, functioning as a selecting module, is configured for selecting the first tool30or the second tool40for machining by selecting the corresponding serial number K1or K2. In other exemplary embodiments, a personal computer can function as the selecting module to be employed to select the corresponding serial number. The human-machine interface20is also capable of determining a tool cutting length of the selected tool for a machining circle.

The invoking module12is configured for invoking the wear data table of the selected tool, such as invoking the tool wear dimension of the corresponding wear data table according to the tool cutting length of the machining circle.

The compensation module13is configured for adjusting a tool cutting length of the selected tool according to the tool wear dimension invoked by the invoking module12. For example, if the first tool30is selected for the machining circle, the first tool30finishes the machining circle with a tool cutting length about 5 mm, the invoking module12invokes the corresponding tool wear dimension about 0.05 mm from the wear data table of the first tool30. Thereby, the compensation module13adjusts a tool cutting length of the first tool30for 6.05 mm for a next machining cycle which previously only requires a tool cutting length about 6 mm.

Referring toFIG. 2, a method of tool compensation is provided, which includes the following blocks. Depending on the embodiment, certain blocks described below may be removed, others may be added, and the sequence of the blocks may be altered.

In block S1, the first tool30is numbered with a first serial number as K1, and the second tool40is numbered with a second serial number as K2.

In block S2, a first data table of the first tool30and a second data table of the second tool40each including a plurality of first dimensional parameters and a plurality of second dimensional parameters in a one-to-one relationship are stored in the storing module11.

In block S3, the human-machine interface20selects the first tool30or the second tool40to machine the workpiece50for a machining circle by selecting the serial number K1or K2.

In block S4, when the selected tool finishes the machining circle, the invoking module12invokes a corresponding second dimensional parameter from a corresponding data table according to a corresponding first dimensional parameter which is determined by the human-machine interface20according to the workpiece50after the machining circle.

In block S5, the compensation module13adjusts a first dimensional parameter of the selected tool for a next machining circle, according to the invoked second dimensional parameter.

In one exemplary embodiment, the storing module11is capable of storing wear data tables of more than two tools or only one wear data table of one tool. In another embodiment, the storing module11may store other kinds of data tables of tools, for example, a kind of data table including a plurality of rotate speeds and a plurality of run-out values of a spindle of a tool. Herein, the tool deviation with respect to the spindle, that is called run-out, has significant effects on cutting force variation. When the tool finishes a machining circle, the invoking module12invokes a corresponding run-out value to adjust a rotate speed of the spindle for a next machining circle, in order to get a high machining precision.