NTC Wire Cutting Machine Tension Arm Calibration Device and Method
By using the synergistic effect of the telescopic component and the test component in the NTC wire EDM machine, the tension arm is automatically adjusted to a vertical state, which solves the problem of complex and inaccurate tension arm calibration in the prior art, and achieves efficient and accurate tension arm calibration to ensure stable tension of diamond wire.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- FERROTEC (NINGXIA) SEMICON TECH CO LTD
- Filing Date
- 2023-10-24
- Publication Date
- 2026-05-26
AI Technical Summary
The existing tension arm calibration process of NTC wire EDM machines is complex, difficult to operate, inefficient, and inaccurate. In particular, the actual origin position of the tension arm deviates from the initial origin, causing unstable tension of the diamond wire and making it prone to breakage.
By employing the synergistic effect of the telescopic component and the testing component, the telescopic component is fixed between the tension arm and the limit stop bar. Combined with the test diamond wire and weights, the tension arm is automatically adjusted to a vertical state to ensure tension balance at the guide wheel on the tension arm.
It improves the accuracy and efficiency of tension arm calibration, reduces operational complexity, ensures stable diamond wire tension, and avoids diamond wire breakage caused by inaccurate calibration.
Smart Images
Figure CN117415398B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of multi-wire cutting machine technology, and in particular to a tension arm calibration device and method for an NTC wire cutting machine. Background Technology
[0002] The NTC wire cutting machine uses the reciprocating motion of diamond wire to cut silicon square bars into silicon wafers about 0.1-0.3mm thin. The diamond wire comes out from the feed wheel, passes through several guide wheels and is wound onto the main roller with fine grooves, then comes out from the main roller and passes through several guide wheels back to the take-up wheel.
[0003] The wrap angle α formed by the diamond wire and the guide wheel is the central angle subtended by the contact arc between the diamond wire and the guide wheel. The size of the wrap angle reflects the length of the contact arc between the diamond wire and the rim surface of the guide wheel. The formula for calculating the wrap angle is: α=l / (2πR), where l is the contact arc length between the diamond wire and the guide wheel, i.e., the wire-guide wheel contact length, R is the radius of the guide wheel, and π is pi.
[0004] The tension of the diamond wire in an NTC wire EDM machine is adjusted by a tension control component, which includes a servo motor, a tension arm, and a first guide wheel. The servo motor drives the tension arm to swing left and right to adjust the tension of the diamond wire. If the tension of the diamond wire is too low, the cutting force will be insufficient; if the tension of the diamond wire is too high, it will cause the diamond wire to break. The reason for the diamond wire breaking is that the longer the contact arc length between the diamond wire and the guide wheel, the greater the tension loss and the greater the friction and wear of the diamond wire. The contact arc length between the diamond wire and the guide wheel is determined by the swing amplitude of the tension arm. Therefore, the starting position of the tension arm (when the tension arm is in a vertical state) and the swing amplitude of the tension arm are the main factors affecting the diamond wire breakage. Before the initial operation of an NTC wire EDM machine, the tension arm needs to be calibrated. After the NTC wire EDM machine has been running for a period of time, the elongation of the diamond wire and slight wear of the tension arm guide wheel will cause changes in the tension arm swing amplitude. In particular, the actual origin position of the tension arm will deviate from the initial origin position. As the running time accumulates, the distance between the actual origin position and the initial origin position of the tension arm becomes larger. If the actual origin position of the tension arm is biased to the right of the initial origin position, the tension of the diamond wire will be greater than the rated tension when the tension arm swings to the left of the initial origin position to adjust the diamond wire, causing the diamond wire to break at the tension arm. Therefore, the tension arm needs to be calibrated twice a month. Each calibration requires that the actual origin position of the tension arm coincide with the initial origin position to ensure that the NTC wire EDM machine works normally.
[0005] The existing calibration process for the tension arm involves the operator attaching a cable tie to the right tension arm and the right limit stop, adjusting the length of the cable tie to make the right tension arm vertical, and then using a calibration wire to sequentially pass over the right guide wheel, the right tension arm guide wheel, and the right tension sensor guide wheel. A weight is suspended from the lower end of the calibration wire, and the weight pulls the calibration wire to deflect the tension arm to the right, while the cable tie pulls the right tension arm to make it vertical. However, because the cable tie has a certain degree of elasticity, it stretches under tension during calibration, requiring the operator to shorten the length of the cable tie again. Once shortened, the cable tie cannot stretch again, making it difficult to adjust the right tension arm to a vertical position. In the above calibration process, sometimes one person needs to hold the weight while another person adjusts the cable tie. This makes the existing calibration process complex, difficult to operate, inefficient, and inaccurate. Summary of the Invention
[0006] The main objective of this invention is to provide a tension arm calibration device for an NTC wire EDM machine, in order to solve the problem that existing technologies cannot easily keep the tension arm in a vertical position when calibrating the tension arm to restore it to its initial position.
[0007] An NTC wire EDM tension arm calibration device includes a telescopic component and a testing component. One end of the telescopic component is fixed to one of the tension arms of the NTC wire EDM, and the other end of the telescopic component is fixed to a limit stop corresponding to the tension arm. The testing component includes a test diamond wire and a weight. The test diamond wire passes sequentially around a guide wheel corresponding to the tension arm, a guide wheel at the top of the tension arm, and a tension sensor guide wheel corresponding to the tension arm. The lower end of the test diamond wire is suspended from the weight. During the shortening process, the telescopic component pulls the tension arm to rotate toward the limit stop, so that the tension arm is in a vertical state under the balance of the telescopic component and the testing component.
[0008] Preferably, the telescopic assembly includes a first fixing member, a second fixing member, and an adjusting member. The first fixing member has a fixing ring and a first threaded rod. The fixing ring is used to fit onto the limiting stop rod. The second fixing member has a U-shaped sleeve portion and a second threaded rod. The U-shaped sleeve portion is used to fit onto the tension arm. Each end of the adjusting member is provided with a threaded hole. The threaded holes at both ends of the adjusting member engage with the first threaded rod and the second threaded rod, respectively. The threads on the first threaded rod and the threads on the second threaded rod are opposite to each other. The threads in the threaded holes at both ends of the adjusting member are also opposite to each other. When the adjusting member rotates in one direction, the length of the telescopic assembly is shortened. When the adjusting member rotates in the other direction, the length of the telescopic assembly is extended.
[0009] Preferably, a pin is provided at the front end of the U-shaped sleeve, which makes it easy to put the U-shaped sleeve onto the tension arm by opening the pin. The outer wall of the pin is provided with an anti-slip layer, which makes it difficult for the anti-slip layer and the tension arm to slide against each other after they come into contact, thus ensuring the speed and accuracy of the debugging process.
[0010] Preferably, the tension arm is provided with an anti-slip groove. When the tension arm is in a vertical state, the height of the anti-slip groove is the same as the height of the limit stop bar on the same side. The anti-slip groove is for placing the pin to prevent the pin from sliding along the tension arm.
[0011] Preferably, the diameter and material of the diamond wire being tested are the same as those used in the NTC wire cutting machine.
[0012] Preferably, the weight has a force of 39.6-48.4 N.
[0013] This invention also provides a method for calibrating the tension arm of an NTC wire EDM machine. This method uses the aforementioned NTC wire EDM tension arm calibration device to complete the calibration, and includes the following steps:
[0014] S1. Rotate one of the tension arms to the vertical position. At this time, the monitor screen of the NTC wire cutting machine will show that the tension arm is at the zero mark, that is, the tension arm reading on the monitor screen is 0mm.
[0015] S2. Adjust the zero-adjustment knob of the servo amplifier to zero;
[0016] S3. Install one side of the telescopic component of the above-mentioned NTC wire cutting machine tension arm calibration device on a tension arm, and install the other side of the telescopic component on the corresponding limit stop of the tension arm.
[0017] S4. The test diamond wire is wound around the guide wheel on the same side of the tension arm, the guide wheel at the top of the tension arm, and the tension sensor guide wheel corresponding to the tension arm in the same winding direction. A weight of 42.9N is suspended at the lower end of the test diamond wire. The adjustment component is rotated to adjust the tension arm to a vertical position. The initial position of the tension arm is displayed at the 0mm mark on the monitor screen. The fine adjustment knob of the servo amplifier is rotated to 42.9N. At this time, the tension of the test diamond wire at the guide wheel at the top of the tension arm is 42.9N.
[0018] S5. Remove the weights, test the diamond wire and the telescopic assembly to complete the calibration of one of the tension arms;
[0019] S6. Follow the calibration steps from S1 to S5 to complete the calibration of the other tension arm.
[0020] Preferably, during the process of "installing one side of the telescopic component of the above-mentioned NTC wire cutting machine tension arm calibration device on a tension arm and installing the other side of the telescopic component on the corresponding limit stop of the tension arm", the telescopic component needs to be kept in a horizontal state.
[0021] As can be seen from the above technical solution of the tension arm calibration device for NTC wire cutting machine, the beneficial effects of the present invention are as follows: the tension arm is in a vertical state under the synergistic action of the telescopic component and the testing component. Even if the tension arm is in an inclined state, it can be adjusted to a vertical state by extending or shortening the telescopic component, so that the tension of the test diamond wire at the guide wheel on the tension arm and the weight of the weight are equal in the numerical state, thereby improving the accuracy of calibration. Attached Figure Description
[0022] Figure 1 This is a three-dimensional schematic diagram of the calibration process of this invention.
[0023] Figure 2 This is a structural diagram of the telescopic component in this invention.
[0024] Figure 3 This is a front view of a portion of the assembly of the present invention.
[0025] In the diagram: telescopic assembly 10, first fixing member 11, fixing ring 111, first threaded rod 112, second fixing member 12, U-shaped sleeve 121, second threaded rod 122, pin 123, adjusting member 13, threaded hole 131, test assembly 20, test diamond wire 21, weight 22, right tension arm 301, anti-slip groove 3011, right limit stop 302, right first guide wheel 303, right second guide wheel 304, right tension sensor 305, right third guide wheel 306, right fourth guide wheel 307, right fifth guide wheel 308, left tension arm 401, left limit stop 402, left first guide wheel 403, right second guide wheel 404, left tension sensor 405, left third guide wheel 406, left fourth guide wheel 307, left fifth guide wheel 308. Detailed Implementation
[0026] The technical solutions and effects of the embodiments of the invention will be further described in detail below with reference to the accompanying drawings.
[0027] Please see Figure 1 and Figure 2The NTC wire EDM tension arm calibration device includes a telescopic component 10 and a testing component 20. One end of the telescopic component 10 is fixed to the right tension arm 301 of the NTC wire EDM, and the other end is fixed to the corresponding right limit stop 302. The testing component 20 includes a test diamond wire 21 and a weight 22. The test diamond wire 21 passes sequentially around the right first guide wheel 201 corresponding to the right tension arm 301, the right second guide wheel 202 at the top of the right tension arm 301, and the right third guide wheel 203 installed on the right tension sensor. The weight 22 is suspended from the lower end of the test diamond wire 21. During the shortening process, the telescopic component 10 pulls the tension arm to rotate toward the right limit stop 302, so that the right tension arm 301 is in a vertical state under the balance of the telescopic component 10 and the testing component 20. Even if the tension arm is in a tilted state, it can be adjusted to a vertical state by extending or shortening the telescopic component, so that the tension of the test diamond wire at the guide wheel on the tension arm and the weight of the weight are equal in the numerical state, thereby improving the accuracy of calibration.
[0028] Furthermore, the telescopic assembly 10 includes a first fixing member 11, a second fixing member 12, and an adjusting member 13. The first fixing member 11 has a fixing ring 111 and a first threaded rod 112. The fixing ring 111 is used to be sleeved on the left limiting stop bar. The second fixing member 12 has a U-shaped sleeve portion 121 and a second threaded rod 122. The U-shaped sleeve portion 121 is used to be sleeved on the right tension arm 301. Each end of the adjusting member 13 is provided with a threaded hole 131. The threaded holes 131 at both ends of the adjusting member 13 respectively engage with the first threaded rod 112 and the second threaded rod 122. The threads provided on the first threaded rod 112 and the threads provided on the second threaded rod 122 are opposite threads to each other. The threads of the threaded holes 131 at both ends of the adjusting member 13 are also opposite threads to each other. When the adjusting member 13 rotates in one direction, the length of the telescopic assembly 10 is shortened. When the adjusting member 13 rotates in the other direction, the length of the telescopic assembly 10 is extended.
[0029] Furthermore, a pin 123 is provided at the front end of the U-shaped sleeve 121. By opening the pin 123, it is easy to put the U-shaped sleeve 121 onto the right tension arm 301. An anti-slip layer is provided on the outer wall of the pin 123. After the anti-slip layer and the right tension arm 301 come into contact, they are not easy to slide against each other, ensuring the speed and accuracy of the debugging process.
[0030] Furthermore, an anti-slip groove 3011 is provided on the right tension arm 301. When the right tension arm 301 is in a vertical state, the height of the anti-slip groove 3011 is the same as the height of the right limit stop 302. The anti-slip groove 3011 is used to place the pin 123 to prevent the pin 123 from sliding along the right tension arm 301, so that the telescopic component 10 is in a horizontal state during the adjustment process, ensuring that the telescopic component 10 and the right tension arm 301 are perpendicular to each other, reducing the resistance when the adjusting component 13 is rotated and adjusting, and improving the convenience of the telescopic component 10 during the telescopic adjustment process.
[0031] Furthermore, the diameter and material of the diamond wire 21 were tested to be the same as those of the diamond wire used in the NTC wire cutting machine.
[0032] Furthermore, the weight of weight 22 is 39.6-48.4 N. The weight of the weight is determined based on the maximum tensile strength that the diamond wire diameter can withstand; the weight of the weight is 1.8 to 2.2 times the tension of the diamond wire during cutting. When the diamond wire diameter is 0.12 mm, the maximum tensile strength during cutting is 22 N, and the weight of the weight is 39.6-48.4 N. Among these, a weight of 42.9 N is optimal, as the time span between calibration and the next calibration is relatively long when using a weight with a weight of 42.9 N.
[0033] This invention also provides a method for calibrating the tension arm of an NTC wire EDM machine. This method uses the aforementioned NTC wire EDM tension arm calibration device to complete the calibration, and includes the following steps:
[0034] S1. Rotate the right tension arm 301 to the vertical position. At this time, the monitor screen of the NTC wire cutting machine will show that the right tension arm 301 is at the zero mark, that is, the reading of the right tension arm 301 on the monitor screen is 0mm.
[0035] S2. Set the zeroing knob of the right servo amplifier to zero. The right servo amplifier corresponds to the right servo motor mounted on the pivot end of the right tension arm. The right servo amplifier is used to test the vertical position signal, forward deviation amplitude signal, and reverse deviation amplitude signal of the right servo motor, and transmits these signals to the monitor screen for display.
[0036] S3. Install one side of the telescopic component 10 of the above-mentioned NTC wire cutting machine tension arm calibration device on the right tension arm 301, and install the other side of the telescopic component 10 on the right limit stop bar 302 corresponding to the right tension arm 301.
[0037] S4. The test diamond wire 21 is wound around the right first guide wheel 303, the right second guide wheel 304 at the top of the right tension arm 301, the right third guide wheel 306 at the front end of the right tension sensor 305, the right fourth guide wheel 307, and the right fifth guide wheel 308 in the same direction as the right tension arm 301. A weight 22 with a weight of 42.9N is suspended at the lower end of the test diamond wire 21. The right tension arm 301 is adjusted to a vertical position by rotating the adjustment component 13. The pointer of the right tension arm 301 is displayed on the monitoring screen pointing to the 0mm mark. The fine adjustment knob of the servo amplifier is adjusted to 42.9N.
[0038] S5. Remove weight 22, test diamond wire 21 and telescopic component 10 to complete the calibration of right tension arm 301.
[0039] S6. Follow the calibration steps from S1 to S5 to complete the calibration of the left tension arm 401. The specific calibration steps are as follows:
[0040] S61. Rotate the left tension arm 401 to the vertical position. At this time, the monitor screen of the NTC wire cutting machine will show that the left tension arm 401 is at the zero mark, that is, the reading of the left tension arm 401 on the monitor screen is 0mm.
[0041] S62. Adjust the zeroing knob of the left servo amplifier to zero. The left servo amplifier corresponds to the left servo motor mounted on the pivot end of the left tension arm. The left servo amplifier is used to test the left servo motor's vertical position signal, forward deviation amplitude signal, and reverse deviation amplitude signal, and transmits these signals to the monitor screen for display.
[0042] S63. Install one side of the telescopic component 10 of the above-mentioned NTC wire cutting machine tension arm calibration device on the left tension arm 401, and install the other side of the telescopic component 10 on the left limit stop bar 402 corresponding to the left tension arm 401.
[0043] S64. The test diamond wire 21 is wound around the left first guide wheel 403, the right second guide wheel 404 at the top of the left tension arm 401, the left third guide wheel 406 at the front end of the left tension sensor 405, the left fourth guide wheel 307, and the left fifth guide wheel 308 in the same direction as the left tension arm 401. A weight 22 with a weight of 42.9N is suspended at the lower end of the test diamond wire 21. The right tension arm 301 is adjusted to a vertical position by rotating the adjustment component 13. The pointer of the left tension arm 401 is displayed on the monitoring screen pointing to the 0mm mark. The fine adjustment knob of the left servo amplifier is rotated to adjust it to 42.9N.
[0044] S65, remove weight 22, test diamond wire 21 and telescopic component 10 to complete the calibration of left tension arm 401.
[0045] Furthermore, during the process of "installing one side of the telescopic component 10 of the above-mentioned NTC wire cutting machine tension arm calibration device on a tension arm, and installing the other side of the telescopic component 10 on the corresponding limit stop of the tension arm," it is necessary to keep the telescopic component 10 in a horizontal state. Keeping the telescopic component 10 in a horizontal state during adjustment reduces the resistance when the adjusting member 13 rotates, thus improving the convenience of telescopic component 10 during telescopic adjustment.
Claims
1. A tension arm calibration device for an NTC wire EDM machine, characterized in that: The device includes a telescopic assembly and a testing assembly. One end of the telescopic assembly is fixed to one of the tension arms of the NTC wire cutting machine, and the other end is fixed to the limit stop corresponding to the tension arm. The testing assembly includes a test diamond wire and a weight. The test diamond wire passes sequentially around the guide wheel corresponding to the tension arm, the guide wheel at the top of the tension arm, and the tension sensor guide wheel corresponding to the tension arm. The lower end of the test diamond wire is suspended from the weight. During the shortening process, the telescopic assembly pulls the tension arm to rotate toward the limit stop, so that the tension arm is in a vertical state under the balance of the telescopic assembly and the testing assembly. The telescopic assembly includes a first fixing member, a second fixing member, and an adjusting member. The first fixing member has a fixing ring and a first threaded rod. The fixing ring is used to fit onto the limiting stop rod. The second fixing member has a U-shaped sleeve and a second threaded rod. The U-shaped sleeve is used to fit onto the tension arm. Each end of the adjusting member has a threaded hole. The threaded holes at both ends of the adjusting member engage with the first threaded rod and the second threaded rod, respectively. The threads on the first threaded rod and the threads on the second threaded rod are opposite to each other. The threads in the threaded holes at both ends of the adjusting member are also opposite to each other. When the adjusting member rotates in one direction, the length of the telescopic assembly shortens. When the adjusting member rotates in the other direction, the length of the telescopic assembly lengthens.
2. The tension arm calibration device for an NTC wire EDM machine as described in claim 1, characterized in that: A pin is provided at the front end of the U-shaped sleeve. By opening the pin, the U-shaped sleeve can be easily placed on the tension arm. The outer wall of the pin is provided with an anti-slip layer. After the anti-slip layer and the tension arm come into contact, they are not easy to slip against each other, ensuring the speed and accuracy of the debugging process.
3. The tension arm calibration device for an NTC wire EDM machine as described in claim 1, characterized in that: The tension arm is equipped with anti-slip grooves. When the tension arm is in a vertical position, the height of the anti-slip grooves is the same as the height of the limit stop bar on the same side. The anti-slip grooves are for placing the pin to prevent the pin from sliding along the tension arm.
4. The tension arm calibration device for an NTC wire EDM machine as described in claim 1, characterized in that: The diameter and material of the diamond wire used in the test were the same as those used in the NTC wire cutting machine.
5. The tension arm calibration device for an NTC wire EDM machine as described in claim 1, characterized in that: The weight has a force of 39.6-48.4 N.
6. A method for calibrating the tension arm of an NTC wire EDM machine, wherein the method uses the NTC wire EDM tension arm calibration device as described in any one of claims 1 to 5 to complete the calibration, characterized in that... Includes the following steps: S1. Rotate one of the tension arms to the vertical position. At this time, the monitor screen of the NTC wire cutting machine will show that the tension arm is at the zero mark, that is, the tension arm reading on the monitor screen is 0mm. S2. Adjust the zero-adjustment knob of the servo amplifier to zero; S3. Install one side of the telescopic component of the above-mentioned NTC wire cutting machine tension arm calibration device on a tension arm, and install the other side of the telescopic component on the corresponding limit stop of the tension arm. S4. The test diamond wire is wound around the guide wheel on the same side of the tension arm, the guide wheel at the top of the tension arm, and the tension sensor guide wheel corresponding to the tension arm in the same winding direction. A weight of 42.9N is suspended at the lower end of the test diamond wire. The adjustment component is rotated to adjust the tension arm to a vertical position. The initial position of the tension arm is displayed at the 0mm mark on the monitor screen. The fine adjustment knob of the servo amplifier is rotated to 42.9N. At this time, the tension of the test diamond wire at the guide wheel at the top of the tension arm is 42.9N. S5. Remove the weights, test the diamond wire and the telescopic assembly to complete the calibration of one of the tension arms; S6. Follow the calibration steps from S1 to S5 to complete the calibration of the other tension arm.
7. The tension arm calibration method for an NTC wire EDM machine as described in claim 6, characterized in that: During the process of "installing one side of the telescopic component of the above-mentioned NTC wire cutting machine tension arm calibration device on a tension arm, and installing the other side of the telescopic component on the corresponding limit stop of the tension arm", the telescopic component needs to be kept in a horizontal state.