JP2016198860A - Bta deep hole processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a BTA deep hole processor which can realize a sufficient sealing effect of a sealing part even when the fastening force with a fastener is small.SOLUTION: A BTA deep hole processor comprises a tool, a tool rotation mechanism that rotates the tool around the axial line, a spindle stock that supports the tool rotation mechanism, a spindle stock movement mechanism that moves the spindle stock in the axial direction of the tool, a cutting liquid supply device that supplies a cutting liquid between a cutting face of a workpiece and the tool, a sealing part brought in contact with the other side of the workpiece, a sealing part movement mechanism that moves the sealing part in the axial direction of the tool, a pressing force evaluation means that evaluates pressing force given to the workpiece from one side to the other side during workpiece processing, and a control means that controls the sealing part movement mechanism on the basis of evaluation results of the pressing force evaluation means. The control means is configured to control to press the workpiece from the other side to one side under such a force as to maintain a static state of the workpiece.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a BTA deep hole processing machine that performs deep hole processing.

  Conventionally, a deep hole processing machine called a BTA deep hole processing machine has been widely used. The name of BTA is the Boring & Trepanning Association (BTA) once formed between Germany, the UK, France, Sweden and the United States, striving to standardize tool standards and working conditions, and exchange technical information with each other. This comes from the enlightenment aimed at further development of the method. Specifically, the BTA deep hole processing machine processes a workpiece with a cylindrical drill (also referred to as a boring bar) in which a flow path is formed. In machining, high-pressure cutting fluid is supplied between the outer peripheral surface of the drill and the work surface of the workpiece. The cutting fluid has a function of cooling the drill, a function of lubricating a cutting point, and the like in addition to a function of discharging generated chips through a flow path formed inside the drill.

  There are two types of workpiece installation methods using a BTA deep hole processing machine. There are a method of fixing the work by a chuck so as to be rotated concentrically with the tool, and a method of placing the work on a table. The latter method has a higher degree of freedom in the shape of the workpiece. In the latter method, a plurality of deep holes can be machined by setting a plurality of workpieces in parallel and moving the table along a plane perpendicular to the axial direction of the tool. it can.

  As a specific method for placing the work on the table, a method using a pair of V blocks installed on the table is common. In this case, the work is placed on the pair of V blocks, and the work is fastened and fixed from above the pair of V blocks by a fastener such as a bolt.

Japanese Patent Publication No. 7-4689

  When placing a workpiece on the table, when machining a through hole, the tool penetrates the workpiece to prevent high pressure cutting fluid from splashing and contaminating the surrounding area when the tool penetrates the workpiece. The seal member is previously placed in liquid-tight contact with the workpiece so as to cover the position to be performed.

  Specifically, as disclosed in Japanese Patent Publication No. 7-4689 (Patent Document 1), the work stopper means (8) presses the pressing member (83), which is a seal member, against the work (W). Thus, when the tool (4) penetrates the workpiece (W), the high-pressure cutting fluid is prevented from being scattered and contaminating the surroundings (see FIG. 5).

  Here, if the fastening force of the fastener is increased too much in order to firmly fix the workpiece, the workpiece may be deformed.

  On the other hand, if the tightening force by the fastener is small, the workpiece may move before processing due to the pressing force (held at a constant value) to the workpiece by the seal portion. In order to prevent this, it is necessary to suppress the pressing force to such a small value that the workpiece does not move. In some cases, there is a problem that the sealing effect of the seal portion is not sufficient.

  In view of the above problems, the present invention provides a BTA deep hole drilling machine capable of sufficiently realizing the sealing effect of the seal portion even when the tightening force by the fastener is small. Let it be an issue.

  The present invention relates to a cylindrical tool in which a flow path disposed on one side of a workpiece and extending from an end on the other side to a region on one side is formed, and at least one of the one side of the tool. A tool rotating mechanism that supports the tool and rotates the tool about its axis, a head stock that supports the tool rotating mechanism, a head stock moving mechanism that moves the head stock in the axial direction of the tool, and the workpiece During the machining, a cutting fluid is supplied between the work surface of the workpiece and the tool, and the cutting fluid is passed from the end on the other side of the tool to the region on the one side through the flow path. A cutting fluid supply device to be circulated, a seal part in contact with the other side of the work, a seal part moving mechanism for moving the seal part in the axial direction of the tool, and when the work is processed, From one side to the other A pressing force evaluation unit that evaluates the applied pressing force; and a control unit that controls the seal portion moving mechanism based on an evaluation result of the pressing force evaluation unit. Correspondingly, the seal portion moving mechanism is controlled so as to press the workpiece from one side to the other side with a force that maintains the stationary state of the workpiece. It is a deep hole processing machine.

  According to the present invention, at the time of deep hole machining of a workpiece, the workpiece is moved with a force that maintains the stationary state of the workpiece in response to the pressing force applied from one side to the other side of the workpiece. By pressing from the other side to one side, the workpiece is prevented from moving before processing even when the clamping force of the fastener to the workpiece is small. Can be fully realized.

  Preferably, the control means has the same magnitude as the pressing force evaluated by the pressing force evaluation means corresponding to the pressing force, and moves the workpiece on the other side with a force opposite to the pressing force. The seal portion moving mechanism is controlled so as to be pressed from one side to the other side.

  In this case, since the work is prevented from moving before processing even when the fastening force to the work by the fastener is extremely small, and even when the work is not fastened by the fastener, the seal portion The sealing effect can be sufficiently realized.

  Preferably, the pressing force evaluating means includes a first sensor that detects a current flowing through the tool rotation mechanism when the tool rotation mechanism rotates the tool, and the headstock moving mechanism is configured to move the spindle. Each of the second sensor for detecting the current flowing through the head stock moving mechanism when the table is moved, the third sensor for detecting the supply pressure of the cutting fluid, and the first to third sensors. And an evaluation main body that evaluates the pressing force based on the detection result.

  In this case, since the pressing force applied from one side to the other side with respect to the workpiece can be accurately evaluated, the stationary state of the workpiece can be reliably maintained.

  Preferably, the cutting fluid supply device has an internal hole that is penetrated by the tool and a flow path that extends from the internal hole to the cutting fluid supply port, and is capable of contacting one side of the workpiece. The pressure table is movable in the axial direction of the tool, and the cutting fluid supply pipe connects the cutting fluid supply port of the pressure table and the cutting fluid supply source.

  In this case, in deep hole machining using a so-called single tube type tool (drill), the cutting fluid can be reliably supplied between the work surface and the tool.

  Preferably, the pressing force evaluation means further includes a fourth sensor for detecting a force with which the pressure table presses the workpiece, and the evaluation main body includes the first to fourth sensors. The pressing force is evaluated based on each detection result.

  In this case, in deep hole drilling using a so-called single tube type tool (drill), it is possible to accurately evaluate the pressing force applied from one side to the other side of the workpiece. Therefore, the stationary state of the workpiece can be reliably maintained.

  Further preferably, the pressure table includes a seal member that allows rotation of the tool and maintains a liquid-tight state with the tool in a region on one side of the internal hole.

  In this case, it is possible to prevent the cutting fluid from leaking from the region on one side of the pressure table during deep hole machining on the workpiece.

  According to the present invention, at the time of deep hole machining of a workpiece by the BTA deep hole machining machine, the stationary state of the workpiece is maintained corresponding to the pressing force applied from one side to the other side of the workpiece. By pressing the workpiece from the other side to the one side with such a force, the workpiece is prevented from moving before processing even when the clamping force of the fastener to the workpiece is small. The sealing effect of the seal part can be sufficiently realized.

It is a schematic front view of the BTA deep hole processing machine of one embodiment of the present invention. It is a schematic sectional drawing of the cutting fluid supply apparatus of the BTA deep hole processing machine of FIG. It is a schematic sectional drawing of the seal part of the BTA deep hole processing machine of FIG. It is a block diagram which shows schematic structure of the control apparatus of the BTA deep hole processing machine of FIG. It is a schematic front view which shows the seal | sticker part and workpiece | work periphery of the conventional BTA deep hole processing machine.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic front view of a BTA deep hole processing machine 100 according to an embodiment of the present invention. As shown in FIG. 1, the BTA deep hole processing machine 100 includes a processing machine 200 and a control device 300 that controls the processing machine 200.

  The processing machine 200 according to the present embodiment is disposed on one side (the right side in FIG. 1) of an installation position of a workpiece W (a method for installing the workpiece W will be described later) that is an object of deep hole machining, and the other A flow path (not shown) extending from one side (left side in FIG. 1) to one side region (for example, one side end, but may not be the end). It has a cylindrical tool 10 formed inside. Further, the processing machine 200 according to the present embodiment supports a tool rotating mechanism 11 that supports at least a part of one side of the tool 10 and rotates the tool 10 around its axis, and a spindle that supports the tool rotating mechanism 11. A platform 20 and a spindle stock moving mechanism 21 that moves the spindle stock 20 in the axial direction of the tool 10 are provided. Furthermore, the processing machine 200 according to the present embodiment supplies cutting fluid between the work surface of the workpiece W and the tool 10 during processing, and supplies the cutting fluid to the other side of the tool 10 through the flow path. And a cutting fluid supply device 30 that circulates from the end portion to the region on one side. Further, the processing machine 200 of the present embodiment includes a seal portion 40 that is in contact with the other side of the workpiece W, and a seal portion moving mechanism 41 that moves the seal portion 40 in the axial direction of the tool 10. ing. In the present embodiment, the headstock 20 and the seal portion moving mechanism 41 are supported on the bed 80.

  FIG. 2 is a schematic cross-sectional view of the cutting fluid supply device 30 of the BTA deep hole processing machine 100 of FIG. As shown in FIG. 2, the cutting fluid supply device 30 of the present embodiment is exposed to a cylindrical inner hole 32 that is penetrated by the tool 10 and a lower outer surface of the cutting fluid supply device 30 from the inner hole 32. And a pressure table 31 that can contact one side (right side) of the workpiece W and can move in the axial direction of the tool 10. Yes. Further, the cutting fluid supply device 30 has a cutting fluid supply pipe 36 that connects the cutting fluid supply port 34 of the pressure table 31 and the cutting fluid supply source 35. In the present embodiment, the cutting fluid supply device 30 supplies the cutting fluid with a pressure of 1 to 1.5 MPa, for example.

  Moreover, the internal hole 32 (which constitutes a part of the chip recovery circuit) of the present embodiment has an inner diameter of 250 mm and a length of 400 mm. Further, as shown in FIG. 2, the inner hole 32 is an annular seal member 37 that allows rotation of the tool 10 and maintains a liquid-tight state with the tool 10 in one region (right region). have. Furthermore, in the present embodiment, an annular seal member 38 that maintains a liquid-tight state between the pressure table 31 and the workpiece W is provided in the region on the other side of the pressure table 31.

  FIG. 3 is a schematic cross-sectional view of the seal portion 40 and the seal portion moving mechanism 41 of the BTA deep hole processing machine 100 of FIG. As shown in FIG. 3, the seal portion 40 of the present embodiment has a bottomed cylindrical shape with an inner diameter of 140 mm and a depth of 75 mm with an end on one side released, and the end on the one side The part is brought into contact with the workpiece W so as to maintain a liquid-tight state.

  The seal portion moving mechanism 41 according to the present embodiment is a hydraulic pressure cylinder having a cylinder 42 and a piston 43 slidably fitted inside the cylinder 42. The seal part moving mechanism 41 is connected to a control device 300 described later, and the control device 300 allows the piston 43 to slide in the axial direction with respect to the cylinder 42. In other words, the seal unit 40 can be moved in the axial direction with respect to the cylinder 42 by the control device 300. The seal portion moving mechanism 41 of the present embodiment can press the workpiece W with a force of, for example, 3000 N through the seal portion 40.

  The processing machine 200 according to the present embodiment is controlled by a control device 300. A block diagram showing a schematic configuration of the control device 300 of the BTA deep hole processing machine 100 of FIG. 1 is shown in FIG.

  As shown in FIG. 4, the control device 300 according to the present embodiment, when machining the workpiece W, presses the workpiece W from one side (right side) to the other side (left side). A pressing force evaluation unit 50 that evaluates the pressure, and a control unit 60 that controls the seal portion moving mechanism 41 based on the evaluation result of the pressing force evaluation unit 50 are provided.

  The pressing force evaluation means 50 of the present embodiment includes a first sensor 51 that detects a current flowing through the tool rotation mechanism 11 when the tool rotation mechanism 11 rotates the tool 10, and a headstock moving mechanism 21. When the head stock 20 is moved, the second sensor 52 for detecting the current flowing through the head stock moving mechanism 21, the third sensor 53 for detecting the cutting fluid supply pressure, and the pressure stock 31 are used for the workpiece W. A fourth sensor 54 that detects a current flowing through the pressure table moving mechanism 70 that moves the pressure table 31 when the pressure table 31 is pressed. Further, the pressing force evaluation means 50 is provided with an evaluation main body 55, and the evaluation main body 55 includes a first current sensor 51, a second current sensor 52, a third pressure sensor 53, and a fourth pressure sensor 53. Based on each detection result of the current sensor 54, the pressing force applied to the workpiece W from one side to the other side is evaluated.

  Specifically, for example, the evaluation main body 55 includes a detection result of the first current sensor 51, a detection result of the second current sensor 52, a detection result of the third pressure sensor 53, and a fourth current. A data table for associating the detection results of the sensor 54 with the forces actually applied to the workpiece W from one side (right side) to the other side (left side) in a state corresponding to each detection result. (Or a function of 4 inputs and 1 output) is stored. This data table can be created in advance based on actual experiments, for example.

  The evaluation main body 55 is given to the workpiece W from one side to the other side based on the detection results of the first to fourth sensors 51 to 54 by referring to this table. The pressing force is evaluated.

  Furthermore, the control means 60 of the present embodiment corresponds to the pressing force evaluated as described above with a force that maintains the stationary state of the workpiece W, specifically, the pressing force evaluation means 50. The seal portion moving mechanism 41 is controlled so as to press the workpiece W from the other side to the one side with a force having the same magnitude as the pressing force evaluated in the above and in a direction opposite to the pressing force. Yes.

  Next, the operation of the BTA deep hole processing machine 100 of the present embodiment will be described.

  First, the workpiece W is installed between the seal unit 40 and the pressure table 31. In the present embodiment, the workpiece W is placed on a V block (not shown) placed on the table in order to prevent displacement of the tool 10 from the axial direction.

  Next, the seal unit 40 and the pressure table 31 are moved together toward the workpiece W by the seal unit moving mechanism 41 and the pressure table moving mechanism 70. And the workpiece | work W is clamped by the said seal | sticker part 40 and the said pressure stand 31, and positioning before the process of the workpiece | work W in the axial direction of the tool 10 is completed.

  From this state, deep hole machining is started. That is, the tool 10 is rotated about its axis by the tool rotation mechanism 11 and the head stock moving mechanism 21 is activated to move the head stock 20 toward the other side. That is, the tool 10 is moved toward the workpiece W. When the rotating tool 10 contacts the workpiece W, deep hole machining for the workpiece W is started. Prior to the contact between the tool 10 and the workpiece W, the cutting fluid supply device 30 supplies a high-pressure (1 to 1.5 MPa) cutting fluid between the tool 10 and the work surface of the workpiece W. The cutting fluid is supplied from the cutting fluid supply source 35 to the internal hole 32 of the pressure table 31 via the cutting fluid supply pipe 36 and the flow path 33 (see FIG. 2), and flows through the internal hole 32 to the tool. 10 and the work surface of the workpiece W. The cutting fluid has a function of cooling the tool 10. Further, the cutting fluid entrains (swallows) the chips generated by the processing, and the region (for example, one side) of the tool 10 through a flow path (not shown) formed inside the tool 10. It is discharged to a discharge port (not shown) provided at the end of this side.

  During the deep hole machining of the workpiece W, the workpiece W is given a pressing force from one side to the other side by the tool 10 or the like. The pressing force is affected not only by the resistance due to machining depending on the material characteristics of the workpiece W and the force caused by the tool 10 due to the feed speed of the tool 10 to the workpiece W, but also by the force from the pressure table 31 and the force due to the high-pressure cutting fluid To do. In order to evaluate such a pressing force, the pressing force evaluation means 50 of the present embodiment uses the first current sensor 51 when the tool rotation mechanism 11 (tool rotation motor) rotates the tool 10. The current flowing through the rotating mechanism 11 is detected, and the current flowing through the headstock moving mechanism 21 when the headstock moving mechanism 21 (headstock moving motor) moves the headstock 20 by the second current sensor. The third pressure sensor 53 detects the supply pressure of the cutting fluid, and the fourth current sensor 54 detects the pressure table moving mechanism 70 (pressure table moving motor) when the pressure table 31 is moved. The current flowing through the pressure table moving mechanism 70 is detected.

  The above detection results are transmitted to the evaluation main body 55. And the said evaluation main-body part 55 refers to the above-mentioned data table stored in the evaluation main-body part 55, for example, and the pressing force currently given with respect to the workpiece | work W from one side to the other side To evaluate.

  The pressing force evaluated by the evaluation main body 55 is transmitted to the control means 60 in real time. And the said control means 60 is the same magnitude | size as the pressing force evaluated by the evaluation main-body part 55, and presses the workpiece | work W from the other side to one side with the force of the opposite direction to the said pressing force. The seal portion moving mechanism 41 is controlled. As a result, during the deep hole machining of the workpiece W, the pressing force directed from one side to the other side with respect to the workpiece W and the force by the seal portion moving mechanism 41 from the other side to the one side are balanced. Thus, the stationary state of the workpiece W is maintained.

  According to the present embodiment as described above, the stationary state of the workpiece W corresponding to the pressing force applied from one side to the other side with respect to the workpiece W during deep hole machining of the workpiece W. The force is such that the workpiece W is moved from the other side to the one side with a force having the same magnitude as that of the pressing force evaluated by the pressing force evaluation means 50 and in a direction opposite to the pressing force. By pressing to the workpiece W, it is possible to prevent the workpiece W from moving before processing even when the clamping force by the fastener with respect to the workpiece W is small, and even when the workpiece W is not fastened with the fastener. The For this reason, the sealing effect of the seal part 40 can be sufficiently realized.

  The pressing force evaluation means 50 includes a first current sensor 51 that detects a current flowing through the tool rotating mechanism 11, a second current sensor 52 that detects a current flowing through the head stock moving mechanism 21, and a cutting fluid. By evaluating the pressing force on the basis of the detection results of the third pressure sensor 53 for detecting the supply pressure and the fourth current sensor 54 for detecting the current flowing through the pressure table moving mechanism 70, Since the pressing force applied to the workpiece W from one side to the other side can be accurately evaluated, the stationary state of the workpiece W can be reliably maintained.

  Further, the cutting fluid supply device 30 has an internal hole 32 that is penetrated by the tool 10 and a flow path 33 that extends from the internal hole 32 to the cutting fluid supply port 34 and can contact one side of the workpiece W. By having a pressure table 31 that is movable in the axial direction of the tool 10 and a cutting fluid supply pipe 36 that connects the cutting fluid supply port 34 and the cutting fluid supply source 35 of the pressure table 31. In deep hole machining using a so-called single tube type tool (drill), the cutting fluid can be reliably supplied between the work surface and the tool.

  In addition, the pressure table 31 has a seal member 37 that allows the tool 10 to rotate and maintains a liquid-tight state with the tool 10 in the region on one side of the internal hole 32. It is possible to prevent the cutting fluid from leaking from the region on one side of the pressure table 31 during deep hole machining on the workpiece W.

  In this embodiment, the piston 43 that supports the seal portion 40 moves relative to the cylinder 42 that is fixed to the bed 80. On the other hand, by fixing the piston 43, the cylinder 42 that supports the seal portion 40 may move with respect to the piston 43 fixed to the bed 80.

  Further, even if it is not a pressing cylinder, for example, the other side of the seal portion 40 is integrally supported by a movable body (alternative to the piston 43 in the embodiment) that can move together with the seal portion 40, and The moving body may be movably supported on a rail extending in the axial direction of the tool. In this case, the seal portion moving mechanism is controlled by the control means 60 to move the workpiece W from the other side with a force that maintains the stationary state of the workpiece W in response to the pressing force applied to the workpiece W. The moving body that integrally supports the seal portion 40 is moved in the axial direction of the tool 10 so as to be pressed to the side of the tool 10.

DESCRIPTION OF SYMBOLS 10 Tool 11 Tool rotation mechanism 20 Head stock 21 Main stock movement mechanism 30 Cutting fluid supply device 31 Pressure stand 32 Internal hole 33 Flow path 34 Cutting fluid supply port 35 Cutting fluid supply source 36 Cutting fluid supply pipe 37 Seal member 38 Seal member 40 Seal portion 41 Seal portion moving mechanism 42 Cylinder 43 Piston 50 Pressing force evaluation means 51 First current sensor 52 Second current sensor 53 Pressure sensor 54 Third current sensor 55 Evaluation body portion 60 Control means 70 Pressure table moving mechanism 80 Bed 100 BTA Deep hole processing machine 200 Processing machine 300 Control device 4 Tool 7 Work clamping means 8 Stopper means 83 Pressing member W Workpiece

Claims (6)

A cylindrical tool in which a flow path disposed on one side of the workpiece and extending from an end on the other side to a region on one side is formed;
A tool rotation mechanism that supports at least a part of one side of the tool and rotates the tool around its axis;
A headstock for supporting the tool rotation mechanism;
A head stock moving mechanism for moving the head stock in the axial direction of the tool;
During machining of the workpiece, a cutting fluid is supplied between the work surface of the workpiece and the tool, and the cutting fluid is supplied from the other end of the tool to the region on the one side via the flow path. A cutting fluid supply device for refluxing
A seal portion in contact with the other side of the workpiece;
A seal portion moving mechanism for moving the seal portion in the axial direction of the tool;
A pressing force evaluation means for evaluating a pressing force applied from one side to the other side of the workpiece when the workpiece is processed;
Control means for controlling the seal portion moving mechanism based on the evaluation result of the pressing force evaluation means;
With
In response to the pressing force, the control means controls the seal portion moving mechanism so as to press the workpiece from the other side to the one side with a force that maintains the stationary state of the workpiece. BTA deep hole processing machine, characterized in that The control means has the same magnitude as the pressing force evaluated by the pressing force evaluation means corresponding to the pressing force, and moves the workpiece from one side to the other side with a force opposite to the pressing force. The BTA deep hole processing machine according to claim 1, wherein the seal portion moving mechanism is controlled so as to be pressed to the BTA. The pressing force evaluation means includes
A first sensor that detects a current flowing through the tool rotation mechanism when the tool rotation mechanism rotates the tool;
A second sensor for detecting a current flowing through the headstock moving mechanism when the headstock moving mechanism moves the headstock;
A third sensor for detecting a supply pressure of the cutting fluid;
An evaluation body for evaluating the pressing force based on the detection results of the first to third sensors;
The BTA deep hole processing machine according to claim 1, wherein the BTA deep hole processing machine is provided. The cutting fluid supply device includes:
It has an internal hole penetrated by the tool and a flow path from the internal hole to the cutting fluid supply port, and can contact one side of the workpiece and move in the axial direction of the tool Possible pressure table,
A cutting fluid supply pipe connecting the cutting fluid supply port of the pressure table and a cutting fluid supply source;
The BTA deep hole drilling machine according to any one of claims 1 to 3, wherein The pressing force evaluation means further includes a fourth sensor that detects a force with which the pressure table presses the workpiece,
The BTA deep hole processing machine according to claim 4, wherein the evaluation main body is configured to evaluate the pressing force based on detection results of the first to fourth sensors. The pressure table includes a seal member that allows rotation of the tool and maintains a liquid-tight state with the tool in a region on one side of the internal hole. The BTA deep hole processing machine according to 4 or 5.

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