A real-time working condition detection device for numerical control machining

Abstract

The utility model provides a kind of numerical control processing real-time working condition detection device, belong to numerical control processing detection technical field;Including: table frame, the inside of table frame is equipped with first accommodating cavity, the top of table frame is equipped with two first threaded through holes, and first fixed bolt is respectively equipped in two first threaded through holes;Clamping rod, clamping rod is formed by the top of table frame and extends upwards, and the inside of clamping rod is equipped with second accommodating cavity, and second accommodating cavity is communicated with first accommodating cavity;The utility model provides a kind of numerical control processing real-time working condition detection device, by installing digital display dial gauge in table frame, by numerical control handle clamping clamping rod of table frame top, realize the on-line detection to complex curved surface feature, solve the problem that complex feature needs to be sent to three coordinate measurement in prior art and lead to high rework cost.

Description

Technical Field

[0001] This utility model belongs to the field of CNC machining testing technology, specifically relating to a real-time CNC machining condition testing device. Background Technology

[0002] In CNC turning and milling, operators can directly measure regular features such as cylinders, square grooves, and holes using calipers and other measuring tools. However, for complex features such as curved surfaces, arc surfaces, and hyperboloids, it is impossible to directly check whether they meet design requirements using conventional measuring tools. Currently, the inspection of such complex curved surface features usually requires the part to be unloaded from the machine tool after machining and sent to a coordinate measuring machine for measurement. If the inspection reveals that the surface machining is out of tolerance due to tool wear or other reasons, the part needs to be re-clamped and reworked, resulting in increased manufacturing costs and economic losses. Utility Model Content

[0003] To address the problems existing in the prior art, the present invention provides a specific technical solution: a CNC machining real-time working condition detection device, comprising: a table frame, wherein the table frame has a first receiving cavity inside, and the top of the table frame has two first threaded through holes, and each of the two first threaded through holes is provided with a first fixing bolt; A clamping rod extends upward from the top of the watch holder, and the clamping rod has a second receiving cavity inside, which communicates with the first receiving cavity; A bushing fixing part is installed at the bottom of the table frame, and a third receiving cavity is provided inside the bushing fixing part. The third receiving cavity communicates with the second receiving cavity. A second threaded through hole is provided on the side wall of the bushing fixing part, and a second fixing bolt is provided inside the second threaded through hole. A digital dial indicator, wherein the dial indicator body is installed in the first receiving cavity, the digital dial indicator battery compartment is installed in the second receiving cavity, and the digital dial indicator bushing is installed in the third receiving cavity; the end of the first fixing bolt abuts against the dial indicator body, and the second fixing bolt is used to tighten the digital dial indicator bushing.

[0004] Preferably, both of the first threaded through holes are M5 threaded holes, and the second threaded through hole is an M5 threaded hole.

[0005] Preferably, both first fixing bolts are M5×12 socket head cap screws, and the second fixing bolt is an M5×40 socket head cap screw.

[0006] The advantages of this CNC machining real-time working condition detection device compared with the prior art are as follows: This utility model provides a real-time working condition detection device for CNC machining. By installing a digital dial indicator in the indicator frame and clamping the clamping rod at the top of the indicator frame with a CNC tool holder, it realizes online detection of complex curved surface features, which solves the problem of high rework costs caused by the need to send complex features offline for coordinate measuring machine measurement in the prior art.

[0007] To address the challenge of online inspection of complex curved surfaces, this device utilizes a CNC machine tool holder to hold the dial indicator frame. A CNC program controls the digital dial indicator's probe to make point-by-point contact with the surface being measured along a vertical direction. The digital dial indicator transmits the measured data at each point to a controller or computer, which compares the data with the tolerance requirements on the drawing to determine if the surface meets the requirements. The inspection can be completed while the part remains clamped on the machine tool after machining, eliminating the need for off-machine transfer to a coordinate measuring machine, resulting in high inspection efficiency.

[0008] The main body of this device consists of a dial indicator frame and a digital dial indicator. The dial indicator frame is a self-made part, and the digital dial indicator itself is inexpensive, resulting in low overall manufacturing costs. The dial indicator body, battery compartment, and bushing are respectively housed in the first receiving cavity of the dial indicator frame, the second receiving cavity of the clamping rod, and the third receiving cavity of the bushing fixing part. The dial indicator body and bushing are fixed by the first and second fixing bolts, respectively, resulting in a compact and reliable installation structure. The clamping rod mates with the clamping surface of a standard CNC tool holder, and the clamping method is consistent with that of ordinary tools, making operation simple and highly applicable. Attached Figure Description

[0009] Figure 1 A schematic diagram of the first overall structure of the CNC machining real-time working condition detection device provided by this utility model; Figure 2 An exploded view of the second overall structure of the CNC machining real-time working condition detection device provided by this utility model; Figure 3 An exploded view of the third overall structure of the CNC machining real-time working condition detection device provided by this utility model; in, Figures 1 to 3 The reference numerals and component names in the attached drawings are as follows: 1. Dial indicator holder; 2. First receiving cavity; 3. First threaded through hole; 4. First fixing bolt; 5. Clamping rod; 6. Second receiving cavity; 7. Bushing fixing part; 8. Third receiving cavity; 9. Second threaded through hole; 10. Second fixing bolt; 11. Digital dial indicator. Detailed Implementation

[0010] The following are specific implementation cases and appendices. Figures 1-3This invention provides further details, but is not limited to these embodiments. This embodiment provides a real-time CNC machining condition detection device for online detection of complex part features such as irregular curved surfaces after CNC milling and turning. By installing a digital dial indicator 11 within a holder 1 and using the CNC machine tool tool holder to clamp the clamping rod 5 at the top of the holder 1, automated detection of irregular features is achieved while the part is still clamped on the machine tool.

[0011] The instrument includes a frame 1, which has a first receiving cavity 2 inside. The frame 1's dimensions match the body of the digital dial indicator 11 to accommodate the dial indicator 11. The top of the frame 1 has two first threaded through holes 3, extending from the top of the frame 1 into the first receiving cavity 2. Both first threaded through holes 3 are M5 threaded holes and are symmetrically arranged front and back on the top surface of the frame 1. Each of the two first threaded through holes 3 has a first fixing bolt 4, which is an M5×12 socket head cap screw. When the dial indicator 11 body is inserted into the first receiving cavity 2, the first fixing bolts 4 are screwed in. The ends of the first fixing bolts 4 abut against the top of the dial indicator 11 body, pressing and fixing the body within the first receiving cavity 2.

[0012] Both first threaded through holes 3 are M5 threaded holes. Their inherent advantage is that M5 thread is a standard coarse thread, which is highly versatile, has a pitch of 0.8mm, and provides high adjustment accuracy for screwing in and out.

[0013] The end of the first fixing bolt 4 abuts against the body of the digital dial indicator 11, pressing and fixing the indicator body within the first receiving cavity 2. This end-tightening fixing method is adaptable to slight differences in the external dimensions of different indicator bodies. If a rigid groove or interference fit were used for fixing, even slight deviations in the dimensions of the indicator body could lead to installation difficulties or insecure fixing. The bolt tightening method adjusts the tightening force by adjusting the screw depth, ensuring reliable fixing of the indicator body and allowing for quick disassembly and replacement.

[0014] The clamping rod 5 extends upward from the top of the dial indicator 1 and is integrally machined or welded to the dial indicator 1. The clamping rod 5 is a cylindrical rod. The clamping rod 5 has a second receiving cavity 6 inside, which is a cylindrical or rectangular cavity that extends downward from the top of the clamping rod 5 and communicates with the first receiving cavity 2. The cross-sectional dimensions of the second receiving cavity 6 match the shape of the battery compartment on top of the digital dial indicator 11, and it is used to accommodate the battery compartment of the digital dial indicator 11.

[0015] The digital dial indicator 11 has a battery compartment at its top, which houses a button battery or a small lithium battery to power the display screen and communication module. After the digital dial indicator 11 is installed in the holder 1, its battery compartment extends upward into the second receiving cavity 6 of the clamping rod 5. The outer cylindrical surface of the clamping rod 5 serves as the clamping surface for the CNC machine tool shank. The jaws of the CNC machine tool shank are clamped onto the clamping rod 5, thus fixing the device to the CNC machine tool.

[0016] The clamping rod 5 extends upward from the top of the meter frame 1, and the second receiving cavity 6 is connected to the first receiving cavity 2. Its inherent advantage is that the meter body and battery compartment of the digital display dial indicator 11 are respectively housed in the meter frame 1 and the clamping rod 5, resulting in a compact overall structure. The digital display dial indicator 11 is completely embedded inside the meter frame 1 and the clamping rod 5, with no exposed cantilever or protruding parts.

[0017] The outer cylindrical surface of the clamping rod 5 serves as the clamping surface of the CNC tool holder. The clamping rod 5 directly engages with the jaws of the standard CNC tool holder. The operator only needs to insert the clamping rod 5 into the tool holder jaws and lock it to complete the clamping of this device, without the need for additional connecting flanges or special fixtures. The diameter of the clamping rod 5 matches the clamping range of the standard CNC tool holder, making clamping convenient and quick, and completely consistent with the usage of CNC tools.

[0018] The bushing fixing part 7 is installed at the bottom of the dial indicator frame 1. The bushing fixing part 7 is a cylindrical sleeve structure, and its material is the same as that of the dial indicator frame 1. The bushing fixing part 7 has a third receiving cavity 8 inside. The third receiving cavity 8 is a cylindrical cavity that extends upward from the bottom end of the bushing fixing part 7 and communicates with the second receiving cavity 6. The diameter of the third receiving cavity 8 matches the outer diameter of the bushing of the digital dial indicator 11 and is used to accommodate the bushing of the digital dial indicator 11.

[0019] The bushing of the digital dial indicator 11 is a cylindrical measuring rod sleeve extending downward from the bottom of the indicator body. The bushing contains a retractable measuring rod with a probe at the bottom. After the digital dial indicator 11 is installed in the indicator frame 1, its bushing extends downward into the third receiving cavity 8 of the bushing fixing part 7.

[0020] The side wall of the bushing fixing part 7 is provided with a second threaded through hole 9, which is an M5 threaded hole that extends horizontally from the outer wall surface of the bushing fixing part 7 to the third receiving cavity 8. A second fixing bolt 10, which is an M5×40 socket head cap screw, is provided inside the second threaded through hole 9. After the bushing of the digital dial indicator 11 is inserted into the third receiving cavity 8, the second fixing bolt 10 is screwed in. The end of the second fixing bolt 10 abuts against the outer wall of the bushing of the digital dial indicator 11, pressing and fixing the bushing within the third receiving cavity 8.

[0021] The second fixing bolt 10 is an M5×40 socket head cap screw. The M5×40 bolt has a longer length, a greater screw-in depth, a larger contact area with the outer wall of the bushing, and a more uniform distribution of clamping force. The bushing does not produce radial displacement during long-term repeated measurements.

[0022] The bushing fixing part 7 presses the bushing of the digital display dial indicator 11 with the second fixing bolt 10. The bushing is stably fixed in the third receiving cavity 8. The bushing does not produce radial wobble when the measuring rod extends or retracts, and the repeatability of the measurement data is high. The fixing point of the bushing is close to the probe, which effectively reduces the impact of the lateral vibration of the probe end on the measurement accuracy when the measuring rod extends or retracts.

[0023] The digital dial indicator 11 is a Mitutoyo 543-400 model, with the following main technical parameters: measuring range 0-12.7mm, resolution 0.01mm, accuracy ±0.01mm, measuring rod stroke 12.7mm, and measuring force approximately 1.5N. This model features data output capability, allowing communication with a computer or controller via a data cable, and supports SPC data output. The dial indicator body is installed in the first receiving cavity 2, the battery compartment in the second receiving cavity 6, and the bushing in the third receiving cavity 8.

[0024] The digital dial indicator 11 is a 543-400 model with data output function. It can be connected to a controller or computer via a data cable to achieve automatic acquisition and transmission of measurement data. In the automated inspection program, the measurement data from the digital dial indicator 11 is transmitted to the controller in real time. The controller compares the measured values ​​with the tolerance range of the drawing to automatically determine whether the measured feature is qualified. No manual reading or recording is required, resulting in high inspection efficiency and accurate data recording.

[0025] Working method and control logic The operator first installs the digital dial indicator 11 into the instrument holder 1. The body of the digital dial indicator 11 is inserted into the first receiving cavity 2 of the instrument holder 1, with the top of the body facing upwards. The battery compartment at the top of the body extends upwards into the second receiving cavity 6 of the clamping rod 5, and the bushing at the bottom of the body extends downwards into the third receiving cavity 8 of the bushing fixing part 7. Using an Allen wrench, the two first fixing bolts 4 are screwed in, with the ends of the first fixing bolts 4 abutting against the top of the digital dial indicator 11 body, pressing the body tightly into the first receiving cavity 2. Using an Allen wrench, the second fixing bolt 10 is screwed in, with the end of the second fixing bolt 10 abutting against the outer wall of the bushing of the digital dial indicator 11, pressing the bushing tightly into the third receiving cavity 8. The installation of the digital dial indicator 11 is now complete.

[0026] The operator inserts one end of the data cable of the digital dial indicator 11 into the data interface on the side of the indicator body, and the other end into the communication interface of the controller. The clamping rod 5 is inserted upwards into the jaws of the CNC machine tool tool holder, and the tool holder locking nut is tightened. The tool holder jaws clamp and fix the clamping rod 5 in place. This device is installed on the CNC machine tool spindle along with the tool holder, and is used in the same way as a standard tool. The measuring rod and probe of the digital dial indicator 11 face downwards.

[0027] The operator moves the device to a standard reference plane, such as the upper surface of the tool setting block on the worktable. Using the CNC program, the spindle slowly descends until the probe contacts the reference plane and continues descending until the measuring rod has compressed approximately half its stroke. At this point, the operator sets the tool length value of the CNC machine tool to the corresponding mechanical coordinate, and the display value of the digital dial indicator 11 corresponds to the current compression of the measuring rod. By adjusting the value displayed on the digital dial indicator 11 by controlling the tool length, tool setting and zeroing are completed.

[0028] The operator prepares the CNC program for the part surface to be inspected and transfers it to the CNC machine tool. The inspection program includes the X, Y, and Z coordinates and movement paths of multiple inspection points on the surface to be measured. Running the inspection program, the CNC machine tool spindle drives the device to move sequentially above each inspection point. At each inspection point, the spindle slowly approaches the surface to be measured vertically from top to bottom. After the probe contacts the surface, it continues to descend to the preset measurement height, where the spindle pauses briefly. During this pause, the digital dial indicator 11 transmits the current reading to the controller or computer via a data cable. After the transmission is complete, the spindle returns to its original position and moves to the next inspection point, repeating the above measurement process until all inspection points have been measured.

[0029] The CNC program controls the probe to contact the surface being measured from top to bottom in a vertical direction. The measurement direction is nearly consistent with the normal direction of the surface, ensuring stable contact of the probe on the surface and accurately reflecting the actual height of the point. For complex surfaces, where the normal direction of each detection point is different, using a uniform vertical contact direction avoids measurement errors caused by probe slippage on inclined surfaces, resulting in good repeatability of the measurement data.

[0030] After the probe contacts the curved surface, the spindle continues to descend to the preset measurement height and pauses briefly. This allows the compression of the measuring rod to reach a constant value, resulting in a constant measuring force on the digital dial indicator 11. The measurement data is unaffected by the spindle's downward speed, ensuring consistent measurement conditions at all detection points. This brief pause allows the digital dial indicator 11 to stabilize its reading before transmitting data, avoiding potential data fluctuations caused by dynamic readings.

[0031] The controller compares the measured data at each detection point with the tolerance requirements of the drawing for the measured feature area, and calculates the height value, measured range of variation, and out-of-tolerance status of each detection point. If the range of variation of the digital dial indicator 11 is within the range required by the drawing, the feature is considered to meet the requirements; if the range of variation exceeds the requirements of the drawing, the feature is considered to be out of tolerance. Operators can promptly detect out-of-tolerance situations while the part is still clamped on the machine tool, and immediately adjust and improve machining deviations caused by tool wear, etc., without having to remove the part from the machine and send it to the coordinate measuring machine, thus avoiding repeated rework.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A real-time working condition detection device for CNC machining, characterized in that, include: The watch frame (1) has a first receiving cavity (2) inside and two first threaded through holes (3) on the top of the watch frame (1). Each of the two first threaded through holes (3) is provided with a first fixing bolt (4). A clamping rod (5) is formed by extending upward from the top of the watch holder (1), and the clamping rod (5) has a second receiving cavity (6) inside, which is connected to the first receiving cavity (2). A bushing fixing part (7) is installed at the bottom of the table frame (1), and a third receiving cavity (8) is provided inside the bushing fixing part (7). The third receiving cavity (8) is connected to the second receiving cavity (6). A second threaded through hole (9) is provided on the side wall of the bushing fixing part (7), and a second fixing bolt (10) is provided inside the second threaded through hole (9). A digital dial indicator (11) is installed in the first receiving cavity (2), the battery compartment of the digital dial indicator (11) is installed in the second receiving cavity (6), the bushing of the digital dial indicator (11) is installed in the third receiving cavity (8), the end of the first fixing bolt (4) abuts against the dial indicator body of the digital dial indicator (11), and the second fixing bolt (10) is used to press the bushing of the digital dial indicator (11); The controller is connected to the digital dial indicator (11) and is used to receive the detection data output by the digital dial indicator (11).

2. The CNC machining real-time working condition detection device according to claim 1, characterized in that, Both of the first threaded through holes (3) are M5 threaded holes, and the second threaded through hole (9) is an M5 threaded hole.

3. The CNC machining real-time working condition detection device according to claim 2, characterized in that, Both first fixing bolts (4) are M5×12 socket head cap screws, and the second fixing bolt (10) is an M5×40 socket head cap screw.

4. The CNC machining real-time working condition detection device according to claim 1, characterized in that, The digital dial indicator (11) is connected to the controller via a data cable to transmit the detection data of each detection point to the controller.

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