Cutting sensing structure for high-precision machine tool

Abstract

The utility model discloses a kind of cutting-off induction structures for high-precision machine tool, including detection shaft sleeve, detection needle, inductive piece and proximity sensor, detection shaft sleeve and proximity sensor are fixed on the moving tool rest of machine tool and move with the movement of the moving tool rest of machine tool, detection needle is installed on detection shaft sleeve and can move linearly on detection shaft sleeve, inductive piece is fixed to the end of detection needle away from workpiece, detection shaft sleeve and proximity sensor move with the moving tool rest of machine tool to the direction of workpiece, and proximity sensor detection inductive piece is used to determine whether workpiece is cut off. The utility model can automatically detect whether the workpiece processed is cut off from bar stock, facilitate workpiece processing, and improve the safety of workpiece processing.

Description

Technical Field

[0001] This utility model relates to a cutting-off sensing structure for high-precision machine tools, belonging to the field of machine tools. Background Technology

[0002] A machine tool is one of the most commonly used pieces of equipment in machining. It consists of a bed, a spindle, and a moving tool post. The spindle holds the bar stock to be machined into a workpiece and drives the bar stock to rotate and feed axially. There are usually two moving tool posts, located on both sides of the bar stock. The moving tool posts are equipped with cutting tools for machining the bar stock from both sides, as well as a cutter to cut the workpiece off the bar stock after machining. During machining, the spindle holds the bar stock, which passes between the two moving tool posts. The spindle drives the bar stock to rotate, and the cutters on the moving tool posts machine the bar stock into a workpiece from both sides. After machining, the counterspindle, opposite the spindle, holds the workpiece. The movable tool holder with the cutter moves towards the workpiece to cut it off the bar stock. The secondary spindle then moves the workpiece away to process the other end of the workpiece. If the workpiece is not cut off the bar stock, the secondary spindle cannot move it. If the secondary spindle is forced to move, the workpiece and bar stock will generate bending moment and shear force, which can easily lead to workpiece damage. When the tool on the movable tool holder is processing the next workpiece on the bar stock, the tool may collide with the workpiece or bar stock that has not been moved during the movement process. This may damage the previous workpiece and also damage the tool, which increases the processing cost of the workpiece and can easily lead to machine tool damage. Summary of the Invention

[0003] The purpose of this invention is to provide a cutting sensing structure for high-precision machine tools, which solves the technical defect in the prior art that machine tools cannot detect whether the processed workpiece has been cut off from the bar stock.

[0004] To solve the above problems, the technical solution adopted by this utility model is: a cutting sensing structure for high-precision machine tools, including a detection sleeve, a detection needle, a sensing element, and a proximity sensor. The detection sleeve and the proximity sensor are both fixed on the moving tool post of the machine tool and move with the movement of the moving tool post of the machine tool. The detection needle is installed on the detection sleeve and can move linearly on the detection sleeve. The sensing element is fixed on the end of the detection needle away from the workpiece. The detection sleeve and the proximity sensor move with the moving tool post of the machine tool towards the workpiece. The proximity sensor detects the sensing element to determine whether the workpiece has been cut. In this invention, both the detection sleeve and the proximity sensor are mounted on the movable tool holder. After the workpiece is cut, the movable tool holder moves toward the workpiece. If the workpiece is cut off, there is no relative movement between the detection pin and the detection sleeve, and the sensing element is within the sensing range of the proximity sensor. However, if the workpiece is not cut off, when the movable tool holder moves toward the workpiece, the workpiece presses against the detection pin, and the detection pin moves relative to the detection sleeve, pushing the sensing element away from the proximity sensor. This causes the sensing element to move beyond the sensing range of the proximity sensor, triggering an alarm on the machine tool. This detects whether the processed workpiece has been cut off from the bar stock. If the workpiece is not cut off, the machine tool issues an alarm, which facilitates workpiece processing while improving the safety of workpiece processing and reducing damage to the tool caused by collisions between the tool and the workpiece or bar stock due to the workpiece not being cut off.

[0005] As a further improvement of this utility model, it also includes a detection spring. The detection sleeve is sleeved on the detection needle, and the detection spring is located inside the detection sleeve and sleeved on the detection needle. The detection spring extends or contracts as the detection needle moves. By setting a detection spring, this utility model facilitates the reset of the detection needle after movement, as the detection needle moves relative to the detection sleeve.

[0006] As a further improvement of this utility model, the detection sleeve includes a first sleeve unit and a second sleeve unit. The first sleeve unit and the second sleeve unit are detachably connected at their opposite ends. The second sleeve unit is located on the side closer to the workpiece. The detection needle passes through the first sleeve unit and the second sleeve unit. The detection spring is located inside the second sleeve unit, with one end abutting against the end of the first sleeve unit and the other end abutting against a fixing member provided on the detection needle. The detection sleeve in this utility model is installed in two detachable parts, which facilitates the installation of the detection spring.

[0007] As a further improvement of this utility model, an annular groove is provided on the detection needle, and the fixing component is a retaining spring, which is disposed in the groove to abut the end of the detection spring. This utility model provides a groove on the detection needle that engages with the retaining spring, securing the retaining spring to the detection needle. The two ends of the detection spring are respectively abutted by the end of the first bushing unit and the retaining spring, allowing the detection spring to extend or retract when the detection needle moves.

[0008] As a further improvement of this utility model, the central through hole on the second bushing unit includes a first through hole unit and a second through hole unit. The first through hole unit is located on the side closer to the first bushing unit and its diameter is larger than that of the second through hole unit. A shoulder is formed at the connection between the first and second through hole units. An annular protrusion is provided on the detection needle, the diameter of which is between the diameters of the first and second through hole units. The end of the annular protrusion abuts against the shoulder to limit the movement of the detection needle within the detection bushing. This utility model forms a shoulder by varying the diameter of the central hole on the second bushing unit. When the shoulder abuts against the annular protrusion on the detection needle, it prevents the detection needle from moving further, thereby limiting the movement of the detection needle within the detection bushing.

[0009] As a further improvement of this utility model, the sensing element has through holes extending through both sides, through which the detection needle passes. A first clamping member is provided on each side of the sensing element on the detection needle to clamp the sensing element onto the detection needle. This utility model uses two first clamping members to clamp the sensing element from both sides, fixing the sensing element onto the sensing needle and allowing it to move synchronously with the movement of the sensing needle.

[0010] As a further improvement of this utility model, the sensing element includes a first sensing unit, a second sensing unit, and a third sensing unit. The first and third sensing units are parallel to each other. The two ends of the second sensing unit are fixedly connected to one end of both the first and third sensing units, forming a Z-shaped structure. A through hole is formed on the first sensing unit, and the third sensing unit is correspondingly positioned to correspond with the proximity sensor. The sensing element in this utility model, composed of three parts forming a Z-shaped structure, allows the detection probe to move a relatively small distance to push the sensing element out of the proximity sensor's sensing range, thus reducing the space occupied by this utility model.

[0011] As a further improvement of this utility model, it also includes a sensor bracket, which is detachably mounted on the moving tool post of the machine tool, and the proximity sensor is mounted on the sensor bracket. This utility model provides a sensor bracket to facilitate the installation of the proximity sensor.

[0012] As a further improvement of this utility model, one side of the sensor bracket is bent towards the direction of the moving tool post away from the machine tool to form a mounting part. A fixing hole penetrating both sides is provided on the mounting part, and the proximity sensor is disposed within the fixing hole. This utility model, by providing a mounting part on the sensor bracket, allows the sensing element to pass through and be fixed to the mounting part, further facilitating the installation of the proximity sensor.

[0013] As a further improvement of this utility model, a second clamping member is provided on each side of the mounting portion of the proximity sensor to clamp the proximity sensor onto the mounting portion. By providing the second clamping members, the proximity sensor is clamped onto the mounting portion from both sides.

[0014] In summary, the beneficial effects of this utility model are as follows: After the workpiece is cut, the movable tool holder moves towards the workpiece. If the workpiece is cut off, there is no relative movement between the detection pin and the detection sleeve, and the sensing element is within the sensing range of the proximity sensor. However, if the workpiece is not cut off, when the movable tool holder moves towards the workpiece, the workpiece blocks the detection pin, and the detection pin moves relative to the detection sleeve, pushing the sensing element away from the proximity sensor. This causes the sensing element to move beyond the sensing range of the proximity sensor, triggering an alarm on the machine tool. This detects whether the processed workpiece has been cut off from the bar stock. When the workpiece is not cut off, the machine tool issues an alarm, which facilitates workpiece processing, improves the safety of workpiece processing, and reduces damage to the tool caused by collisions between the tool and the workpiece or bar stock due to the workpiece not being cut off. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model used on a machine tool.

[0016] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0017] Figure 3 This is a three-dimensional structural schematic diagram of the present invention (excluding the sensing element and proximity sensor).

[0018] Figure 4 This is a three-dimensional exploded view of the present invention (excluding the sensing element and proximity sensor).

[0019] Figure 5 This is a cross-sectional view of the present invention along the axial direction (excluding the sensing element and proximity sensor).

[0020] The components are: 1. Detection bushing; 2. Detection pin; 3. Sensor; 4. Proximity sensor; 5. Moving tool holder; 6. Detection spring; 7. First bushing unit; 8. Second bushing unit; 9. Slot; 10. Snap ring; 11. First through hole unit; 12. Second through hole unit; 13. Shoulder; 14. Annular protrusion; 15. First clamping member; 16. First sensing unit; 17. Second sensing unit; 18. Third sensing unit; 19. Sensor bracket; 20. Mounting part; 21. Second clamping member; 22. Lathe tool; 23. Cutting tool. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0022] like Figures 1 to 5 The high-precision machine tool cutting-off sensing structure shown includes a detection sleeve 1, a detection needle 2, a sensing element 3, and a proximity sensor 4. The proximity sensor 4 is connected to the machine tool's alarm device. Both the detection sleeve 1 and the proximity sensor 4 are fixed on the machine tool's movable tool post 5. In operation, both the detection sleeve 1 and the proximity sensor 4 move with the movement of the machine tool's movable tool post 5. In this invention, the detection sleeve 1 is mounted horizontally on the machine tool's movable tool post 5. The detection needle 2 is mounted on the detection sleeve 1 and can move linearly horizontally relative to the detection sleeve 1. The sensing element 3 is fixed to the end of the detection needle 2 furthest from the workpiece. After cutting the workpiece, the detection sleeve 1 and the proximity sensor 4 move towards the workpiece along with the machine tool's movable tool post 5. During this movement... The proximity sensor 4 detects the sensing element 3 to determine whether the workpiece has been cut. Under normal circumstances, the sensing element 3 is located within the sensing range of the proximity sensor 4. During the aforementioned movement, if the workpiece is cut, both the proximity sensor 4 and the sensing element 3 can only move horizontally in sync with the moving tool post 5 of the machine tool, and their relative positions remain unchanged. The sensing element 3 is always within the sensing range of the proximity sensor 4. However, if the workpiece is not cut, during the aforementioned movement, the detection pin 2 in the detection sleeve 1 is blocked by the workpiece and moves away from the workpiece relative to the detection sleeve 1. The sensing element 3 moves synchronously with the movement of the detection pin 2. At this time, the distance between the sensing element 3 and the proximity sensor 4 increases. When the sensing element 3 moves beyond the sensing range of the proximity sensor 4, the alarm of the machine tool sounds an alarm.

[0023] like Figure 4 and Figure 5 As shown, in order to ensure that the detection needle 2 can smoothly rebound and reset after detecting an uncut workpiece, this invention is equipped with a detection spring 6. The detection sleeve 1 is sleeved on the detection needle 2, and the detection spring 6 is located inside the detection sleeve 1 and sleeved on the detection needle 2. The detection spring 6 extends or contracts as the detection needle 2 moves. When the workpiece is not cut, the detection needle 2 is pressed against by the uncut workpiece. When the detection sleeve 1 moves toward the workpiece, the detection needle 2 moves horizontally relative to the detection sleeve 1 toward the direction away from the workpiece and compresses the detection spring 6. When the detection sleeve 1 moves away from the workpiece, the detection spring 6 extends and resets, pushing the detection needle 2 to move horizontally relative to the detection sleeve 1 toward the workpiece, so that the detection needle 2 resets relative to the detection sleeve 1.

[0024] like Figure 4 and Figure 5As shown, the detection bushing 1 of this utility model includes a first bushing unit 7 and a second bushing unit 8. The first bushing unit 7 and the second bushing unit 8 are detachably connected at opposite ends. The first bushing unit 7 has an external thread at its end and the second bushing unit 8 has an internal thread at its end. The end of the first bushing unit 7 extends into the second bushing unit 8 and is threadedly engaged, so that the first bushing unit 7 and the second bushing unit 8 can be detachably installed. The second bushing unit 8 is located on the side closer to the workpiece. The detection needle 2 passes through the first bushing unit 7 and the second bushing unit 8. The detection spring 6 of this utility model is located inside the second bushing unit 8. One end of the detection spring 6 abuts against the end of the first bushing unit 7, and the other end abuts against the fixing member provided on the detection needle 2. The present invention has an annular groove 9 on the detection needle 2, wherein the fixing member is a retaining spring 10. The retaining spring 10 is disposed in the groove 9 so that it cannot be displaced along the axial direction of the detection needle 2. The retaining spring 10 is used to abut against the end of the detection spring 6 and fix one end of the detection spring 6.

[0025] like Figure 5 As shown, the central through hole on the second bushing unit 8 of this utility model for the detection needle to pass through includes a first through hole unit 11 and a second through hole unit 12. The first through hole unit 11 is located on the side close to the first bushing unit 7, and the diameter of the first through hole unit 11 is larger than the diameter of the second through hole unit 12. At the connection between the first through hole unit 11 and the second through hole unit 12, a shoulder 13 is formed that is perpendicular to the center line of the central through hole and is annular. On the detection needle 2, an annular protrusion 14 is formed along its radial direction away from the center line of the detection needle 2. The diameter of the annular protrusion 14 is located within the first through hole unit. Between the aperture of the first through hole unit 11 and the second through hole unit 12, the portion of the detection needle 2 with the annular protrusion 14 can move axially within the first through hole unit 11, but cannot enter the second through hole unit 12. When the end of the annular protrusion 14 abuts against the shoulder 13, it is used to limit the movement of the detection needle 2 within the detection bushing 1. When the end of the annular protrusion 14 abuts against the shoulder 13, the distance between the end of the detection needle 2 and the workpiece is less than the distance between the cutting tool 22 on the moving tool holder 5 of the machine tool and the workpiece, so as to avoid the detection needle 2 interfering with the movement of the moving tool holder 5 of the machine tool when processing the workpiece.

[0026] like Figure 1 and Figure 2As shown, the specific structure of the sensor 3 mounted on the detection needle 2 in this utility model is as follows: a through hole (not shown in the figure) is provided on the sensor 3 through both sides, the end of the detection needle 2 passes through the through hole, and a first clamping member 15 is provided on each side of the sensor 3 on the detection needle 2 to clamp the sensor 3 on the detection needle 2. The first clamping member 15 in this utility model is a clamping nut that is threaded with the detection needle 2. The sensor 3 is detachably mounted on the detection needle 2 by clamping the nut, and the installation and removal of the sensor 3 are facilitated. The sensing element 3 in this utility model includes a first sensing unit 16, a second sensing unit 17, and a third sensing unit 18. The first sensing unit 16 and the third sensing unit 18 are parallel and perpendicular to the second sensing unit 17. Both the first sensing unit 16 and the third sensing unit 18 are vertically arranged. The two ends of the second sensing unit 17 are fixedly connected to the lower end of the first sensing unit 16 and the upper end of the third sensing unit 18, respectively, so that the sensing element 3 has a Z-shaped structure. A through hole is opened on the first sensing unit 16. Two clamping nuts clamp the first sensing unit 16 onto the detection needle 2, so that the sensing element 3 is installed on the detection needle 2 as a whole. In this utility model, the third sensing unit 18 is correspondingly arranged with the proximity sensor 4. When the third sensing unit 18 is outside the sensing range of the proximity sensor 4, the machine tool alarm sounds.

[0027] like Figure 1 and Figure 2 As shown, to facilitate the installation of the proximity sensor 4, this utility model provides a sensor bracket 19. The sensor bracket 19 is detachably mounted on the moving tool post 5 of the machine tool using two upper and lower bolts. The proximity sensor 4 is mounted on the sensor bracket 19. One side of the sensor bracket 19 in this utility model is bent 90 degrees away from the moving tool post 5 of the machine tool to form a mounting part 20. A fixing hole (not shown in the figure) is provided on both sides of the mounting part 20. The proximity sensor 4 is mounted in the fixing hole. A second clamping member 21 is provided on each side of the proximity sensor 4 located on the mounting part 20 to clamp the proximity sensor 4 onto the mounting part 20. The second clamping member 21 in this utility model is a clamping nut. The two clamping nuts are threadedly engaged with the proximity sensor 4 to clamp the proximity sensor 5 onto the mounting part 20, so that the proximity sensor 5 can be detachably mounted on the mounting part 20.

[0028] like Figure 1As shown, this utility model has two movable tool holders 5 arranged on the machine tool bed, facing each other. During use, the bar stock held by the spindle passes between the two movable tool holders 5, and the workpiece is processed by the cutting tools on the movable tool holders 5. One of the movable tool holders 5 is equipped with a cutting-off blade 23. The structure of the movable tool holder 5 is existing technology. After the workpiece is processed, the machine tool's counterspindle moves to hold the workpiece, and the movable tool holder 5 with the cutting-off blade 23 moves towards the workpiece, whereby the cutting-off blade 23 cuts the processed workpiece from the bar stock. The counterspindle removes the held workpiece and continues processing the cut-off end of the workpiece. The movable tool holder 5 with the cutting-off blade 23 then moves away from the workpiece. At this time, the other movable tool holder 5 moves to a position where its detection pin 2 centerline is at the same height as the workpiece. With the centerline of the bar stock at the same height, the moving tool post 5 moves towards the workpiece. Simultaneously, the cutting sensing structure on the moving tool post 5 moves towards the workpiece. If the workpiece is not cut, the detection needle 2 presses against the workpiece, pushing the sensing element 3 away from the workpiece until it is outside the sensing range of the proximity sensor 4. At this time, since the proximity sensor 4 cannot sense the sensing element 3, it sends a sensing signal to the machine tool's control system, which then controls the machine tool's alarm to sound an alarm. If the workpiece is cut off and falls from the bar stock, the relative positions of the detection needle 2 and the sensing element 3 with the proximity sensor 4 remain unchanged as the moving tool post 5 moves. The sensing element 3 is always within the sensing range of the proximity sensor 4, and the machine tool's alarm will not sound an alarm. Thus, it can automatically determine whether the workpiece has been cut off from the bar stock after processing.

[0029] Unless otherwise specified in the above description, all parts are prior art, or can be implemented using existing technology. Furthermore, the specific embodiments described in this utility model are merely preferred embodiments and are not intended to limit the scope of this utility model. That is, all equivalent changes and modifications made to the content of the claims of this utility model should be considered within the technical scope of this utility model.

Claims

1. A cutting-off sensing structure for a high-precision machine tool, characterized in that: It includes a detection bushing, a detection needle, a sensing element, and a proximity sensor. The detection bushing and the proximity sensor are both fixed on the moving tool post of the machine tool and move with the moving tool post of the machine tool. The detection needle is mounted on the detection bushing and can move linearly on the detection bushing. The sensing element is fixed on the end of the detection needle away from the workpiece. The detection bushing and the proximity sensor move with the moving tool post of the machine tool towards the workpiece. The proximity sensor detects the sensing element to determine whether the workpiece has been cut off.

2. The cutting-off sensing structure for high-precision machine tools according to claim 1, characterized in that: It also includes a detection spring, a detection bushing is fitted on the detection needle, the detection spring is located inside the detection bushing and fitted on the detection spring, and the detection spring extends or contracts as the detection needle moves.

3. The cutting-off sensing structure for high-precision machine tools according to claim 2, characterized in that: The detection bushing includes a first bushing unit and a second bushing unit. The first bushing unit and the second bushing unit are detachably connected at opposite ends. The second bushing unit is located on the side closer to the workpiece. The detection needle passes through the first bushing unit and the second bushing unit. The detection spring is located inside the second bushing unit, with one end abutting against the end of the first bushing unit and the other end abutting against a fixing member provided on the detection needle.

4. The cutting-off sensing structure for high-precision machine tools according to claim 3, characterized in that: An annular groove is provided on the detection probe, and the fixing component is a retaining spring, which is set in the groove to abut the end of the detection spring.

5. The cutting-off sensing structure for high-precision machine tools according to any one of claims 2 to 4, characterized in that: The central through hole on the second bushing unit includes a first through hole unit and a second through hole unit. The first through hole unit is located on the side close to the first bushing unit and its diameter is larger than that of the second through hole unit. A shoulder is formed at the connection between the first through hole unit and the second through hole unit. An annular protrusion is provided on the detection needle. The diameter of the annular protrusion is between the diameters of the first through hole unit and the second through hole unit. The end of the annular protrusion abuts against the shoulder to limit the movement of the detection needle in the detection bushing.

6. The cutting-off sensing structure for high-precision machine tools according to claim 1, characterized in that: The sensor has through holes on both sides, through which the detection needle passes. A first clamping member is provided on each side of the sensor on the detection needle to clamp the sensor onto the detection needle.

7. The cutting-off sensing structure for high-precision machine tools according to claim 6, characterized in that: The sensing element includes a first sensing unit, a second sensing unit, and a third sensing unit. The first sensing unit and the third sensing unit are parallel. The two ends of the second sensing unit are fixedly connected to one end of the first sensing unit and one end of the third sensing unit, respectively, so that the sensing element has a Z-shaped structure. A through hole is opened on the first sensing unit, and the third sensing unit is correspondingly set with the proximity sensor.

8. The cutting-off sensing structure for high-precision machine tools according to claim 1, characterized in that: It also includes a sensor bracket, which is detachably mounted on the moving tool post of the machine tool, and the proximity sensor is mounted on the sensor bracket.

9. The cutting-off sensing structure for high-precision machine tools according to claim 8, characterized in that: One side of the sensor bracket is bent toward the moving tool post away from the machine tool to form a mounting part. A fixing hole is provided on the mounting part, passing through both sides, and the proximity sensor is set in the fixing hole.

10. The cutting-off sensing structure for high-precision machine tools according to claim 9, characterized in that: A second clamping member is provided on each side of the mounting part of the proximity sensor to clamp the proximity sensor onto the mounting part.

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