Method and equipment for detecting tool failure

• US 4,420,685 A
• Filed: 02/18/1981
• Issued: 12/13/1983
• Est. Priority Date: 02/18/1981
• Status: Expired due to Term

• Current Assignee: Hitachi Seiko Limited
• Original Assignee: Hitachi Seiko Limited
• Inventors: Kanaya, Yasuhiko, Ohtani, Tamio
• Primary Examiner(s): Nelms, David C.
• Application Number:
  US06/235,580
• Time in Patent Office: 1,028 Days
• Field of Search: 408/7, 408/16, 408/6, 250/222 R, 250/222 PC, 250/223 R, 250/561, 235/92 V, 235/92 PC, 235/92 PD
• US Class Current: 250/222.2
• CPC Class Codes: B23Q 11/0042 Devices for removing chips B23Q11/02, B23Q11/0875 take precedence
• CPC Class Codes: B23Q 17/0957 Detection of tool breakage detecting failure of drills B23B49/001
• CPC Class Codes: G01V 8/20 using multiple transmitters or receivers
• CPC Class Codes: Y10T 408/14 Responsive to condition of Tool or tool-drive

Abstract

In a machine tool, a tool failure detection equipment in which chips or particles resulting from the machining of a work are collected and whether the tool is intact or broken is detected from the quantity of collected chips or particles. Chips or particles are sucked by a suction means and the quantity of collected chips or particles is detected by an optical detecting means. When the detected quantity is less than a predetermined value, the tool is detected as being broken.

Claims

1. A method for detecting a drill tool failure in a drilling machine characterized by:

collecting chips or particles resulting from the machining with a drilling tool, and

collecting chips or particles resulting from the machining with a drilling tool with chip or particle collection means for collecting chips or particles resulting from the drilling of works with the drilling tool, and

detecting the quantity of collected chips or particles so as to detect whether the drilling tool is intact or broken through use of chip or particle detection means for detecting the quantity of collected chips or particles, whereby whether the drilling tool is intact or broken is detected from the quantity of collected and detected chips or particles.

2. In a drilling machine, a drill tool failure detection equipment characterized by the provision of:

a drilling tool for drilling works,

chip or particle collection means for collecting chips or particles resulting from the drilling of works with the drilling tool,

chip or particle detection means for detecting the quantity of collected chips or particles, whereby whether the drilling tool is intact or broken is detected from the quantity of collected and detected chips or particles.

3. A drilling tool failure detection equipment as set forth in claim 2 further characterized in that

said chip or particle collection means comprises

a duct through which the chips or particles are sucked, and

a suction means which is communicated with said duct and which is provided with a suction source.

4. A drilling tool failure detection equipment as set forth in claim 3 further characterized in that

said chip or particle detection means is situated as part of said duct, so that particles or chips sucked by said duct will travel through said chip or particle detection means en route to said collection means.

5. A drill failure detection equipment as set forth in claim 2 or 3 or 4 further characterized in that

said chip or particle detection means comprises an optical detector.

6. In a drilling machine, a drilling tool failure detection equipment characterized by the provision of

a drilling tool,

a feed means for moving the drilling tool to or away from a work,

a work holding means which is provided with a through hole through which said drilling tool is extended toward the work when said drilling tool is moved toward the work and which is provided with a guide means communicated with said through hole,

a supporting means for supporting said work holding means in such a way that said work holding means in movable in the direction perpendicular to the axis of said drilling tool,

a small chamber or space defined around said drilling tool by said work holding means,

a chip or particle collection means comprising a duct communicated with said small chamber or space and a suction source communicated with said duct for collecting chips or particles resulting from the drilling of the work, and chip or particle detection means for detecting the quantity of collected chips or particles, whereby whether the drilling tool is intact or broken is detected from the quantity of collected and detected chips or particles.

7. A drilling machine according to claim 6, further comprising:

chip or particle detection means for detecting the quantity of collected chips or particles, whereby whether the drilling tool is intact or broken is detected from the quantity of collected and detected chips or particles.