A control method for wire-cut molybdenum wire

Abstract

The present invention discloses a method for controlling molybdenum wire for wire cutting, which relates to the technical field of reciprocating wire cutting, and solves the technical problems of short service life and high cost of use of molybdenum wire in reciprocating wire cutting equipment. The control method comprises: obtaining the diameter of the molybdenum wire; when the diameter of the molybdenum wire obtained is smaller than a first value, placing the reciprocating wire cutting machine in a unilateral control state; obtaining the tension release degree of a first tension adjustment mechanism; when the obtained tension release degree of the first tension adjustment mechanism reaches a second value; obtaining the tension release degrees of the first tension adjustment mechanism and the second tension adjustment mechanism; when the obtained tension release degree of the first tension adjustment mechanism reaches a third value, tightening the wire through a wire drum; and placing the reciprocating wire cutting machine in a unilateral control state after the tightening operation. The present application can increase the service life of the molybdenum wire and reduce the cost of using the molybdenum wire for wire cutting.

Description

Technical Field

[0001] The invention belongs to the technical field of wire-cutting reciprocating wire cutting, and in particular relates to a molybdenum wire control method for wire cutting. Background Art

[0002] Currently, medium-speed reciprocating wire EDM is increasingly used in the manufacturing industry. Molybdenum wire, a precious metal with high operating costs, is typically used as the wire electrode. Reciprocating wire EDM machines commonly use a spring-guided pulley tension mechanism as the tension adjustment mechanism. Because this spring-guided pulley mechanism employs bilateral tension control, the electrode wire experiences electrical erosion and thermal stretching during machining. As machining progresses, the electrode wire diameter gradually decreases. When the electrode wire wear reaches a certain level, it can break under the influence of tension, shortening the wire's lifespan. Summary of the Invention

[0003] The present application aims to at least to some extent solve the technical problems of short service life and high cost of molybdenum wire in wire-cutting reciprocating cutting equipment. To this end, the present application provides a method for controlling wire-cutting molybdenum wire.

[0004] In order to achieve the above objectives, the technical solutions of this application are as follows:

[0005] A molybdenum wire control method for wire cutting is applied to a reciprocating wire cutting machine. The reciprocating wire cutting machine includes a wire drum, a first tension adjustment mechanism, a second tension adjustment mechanism, and a plurality of guide pulleys. The first tension adjustment mechanism and the second tension adjustment mechanism are respectively arranged on both sides of the wire drum. The molybdenum wire is wound around the wire drum, the guide pulleys, and the tension adjustment mechanism. When the molybdenum wire is cutting, the first tension adjustment mechanism and the second tension adjustment mechanism are both in a tension-released state. The molybdenum wire control method includes the following steps:

[0006] Obtaining the diameter of the molybdenum wire;

[0007] The obtained diameter of the molybdenum wire is smaller than a first value, and the reciprocating wire cutting machine is in a unilateral control state, wherein the first tension adjustment mechanism is in a tension release state, and the second tension adjustment mechanism is in a locked state;

[0008] obtaining a tension release degree of the first tension adjustment mechanism;

[0009] When the obtained tension release degree of the first tension adjustment mechanism reaches a second value, the reciprocating wire cutting machine is placed in a bilateral control state, wherein both the first tension adjustment mechanism and the second tension adjustment mechanism are in a tension release state;

[0010] obtaining tension release degrees of the first tension adjustment mechanism and the second tension adjustment mechanism;

[0011] When the obtained tension release degree of the first tension adjustment mechanism reaches a third value, the wire is tightened by the wire drum;

[0012] After the wire tightening operation, the reciprocating wire cutting machine is placed in a unilateral control state.

[0013] In some embodiments, after the reciprocating wire cutting machine completes cutting of a product, the diameter of the molybdenum wire is obtained.

[0014] In some embodiments, a micrometer is used to obtain the diameter of the molybdenum wire.

[0015] In some embodiments, before obtaining the diameter of the molybdenum wire, a plurality of measurement points are determined, and the diameters of the molybdenum wire at the plurality of measurement points are obtained.

[0016] In some embodiments, the smallest diameter value among the plurality of measurement points is compared with the first value.

[0017] In some embodiments, the first value is 0.16 mm.

[0018] In some embodiments, the second value and the third value are both ratios of a spring compression amount of the tension adjustment mechanism to a natural length of the spring, wherein the second value is smaller than the third value.

[0019] In some embodiments, the second value is 3 / 7.

[0020] In some embodiments, the third value is 1 / 2.

[0021] In some embodiments, if the diameter of the obtained molybdenum wire is smaller than the first value, the product cut by the reciprocating wire cutting machine is replaced.

[0022] The embodiments of the present application have at least the following beneficial effects:

[0023] It can be seen from the above technical solution that the wire-cut molybdenum wire control method disclosed in the present invention changes the cutting machine from a bilateral control state to a unilateral control state to reduce the tension of the molybdenum wire after the diameter of the molybdenum wire is lower than the set value, thereby reducing the thermal stretching and electrical corrosion of the molybdenum wire during the cutting process. That is, by alternating between the unilateral control state, the bilateral control state and the wire tightening operation, the tension of the molybdenum wire is maintained at a level that allows cutting operations and is less than the tension of the molybdenum wire when the diameter is greater than the first value, thereby reducing the probability of the molybdenum wire being stretched and broken, improving the service life of the molybdenum wire, reducing the frequency of replacing the molybdenum wire with the cutting machine, and improving the utilization rate of the wire cutting equipment, thereby reducing the cost of using molybdenum wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic flow chart of a molybdenum wire control method according to an embodiment of the present application is shown;

[0026] Figure 2 A schematic diagram of the mechanism of the cutting machine in a unilateral control state in an embodiment of the present application is shown;

[0027] Figure 3 A schematic diagram of the mechanism of the cutting machine in a bilateral control state in an embodiment of the present application is shown;

[0028] Markings in the figure: 1-wire drum, 2-wire pulley, 3-molybdenum wire, 4-first tension adjusting mechanism, 5-second tension adjusting mechanism, 6-guide wheel, 7-product to be cut. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0030] In addition, this application may repeat reference numbers and / or reference letters in different examples. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials, but those of ordinary skill in the art will recognize the application of other processes and / or the use of other materials.

[0031] Figure 1 A schematic flow chart of a control method in an embodiment of the present application is shown; Figure 2 A schematic diagram of the mechanism of the cutting machine in a unilateral control state in an embodiment of the present application is shown; Figure 3 A schematic diagram of the mechanism of the cutting machine in the embodiment of the present application in a bilateral control state is shown.

[0032] The present application is described below with reference to specific embodiments and with reference to the accompanying drawings:

[0033] A reciprocating wire cutting machine (hereinafter referred to as the cutting machine) is used to cut the product 7 to be cut. The product 7 to be cut is mostly a stator, rotor, etc. with high precision requirements. The cutting machine includes a wire drum 1, a first tension adjustment mechanism 4, a second tension adjustment mechanism 5 and multiple wire pulleys 2. The first tension adjustment mechanism 4 and the second tension adjustment mechanism 5 are respectively arranged on both sides of the wire drum 1 to ensure the tension of the molybdenum wire 3. A single cutting machine can be equipped with multiple wire pulleys 2 to change the direction of the molybdenum wire 3, thereby facilitating the cutting operation. Among them, at least one wire pulley 2 is arranged between the wire drum 1 and each tension adjustment mechanism, and the molybdenum wire 3 is thus wound between the wire drum 1, multiple wire pulleys 2 and the two tension adjustment mechanisms.

[0034] like Figure 1 、 Figure 2 and Figure 3 As shown, this embodiment provides a method for controlling a molybdenum wire 3 for wire cutting, which is applied to a reciprocating wire cutting machine. When a new molybdenum wire 3 is replaced for cutting, the two tension adjustment mechanisms are in a tension release state. As the number of processed products increases, the diameter of the molybdenum wire 3 gradually decreases. Therefore, in this embodiment, the method for controlling the molybdenum wire 3 includes the following steps:

[0035] Step 100: Obtain the diameter of the molybdenum wire 3.

[0036] The highest processing efficiency for the molybdenum wire 3 used for online cutting is achieved when its diameter is 0.16-0.18 mm. Generally, newly used molybdenum wire 3 is 0.18 mm. During the cutting operation, the molybdenum wire 3 travels a long distance. After a single cut, the diameter of the molybdenum wire 3 at different locations is relatively similar. Therefore, the diameter of the molybdenum wire 3 can be measured at any point on the cutting machine. Of course, operators can use experience to determine how many cuts will require the diameter of the molybdenum wire 3 to approach 0.16 mm, and then choose to measure the diameter of the molybdenum wire 3 at an appropriate time to reduce the number of measurements.

[0037] Step 200: The diameter of the obtained molybdenum wire 3 is smaller than the first value, and the reciprocating wire cutting machine is in a unilateral control state, wherein the first tension adjustment mechanism 4 is in a tension release state, and the second tension adjustment mechanism 5 is in a locked state.

[0038] Among them, the value of the first value is less than 0.18. After the diameter of the molybdenum wire 3 is reduced, its strength to resist the same tension becomes smaller. At this time, when the tension remains unchanged, there is thermal stretching and electro-erosion loss during the wire cutting process, which causes the diameter of the molybdenum wire 3 to be sharply stretched and reduced, and to be elongated or broken. When the molybdenum wire 3 cuts different products, its thermal stretching and electro-erosion loss are also different. Therefore, the operator can set the value of the first value according to the operation requirements.

[0039] The tension adjustment mechanism includes a seat body, a slider, a spring and a locking piece. A guide rail is provided on the seat body, and the slider is slidably set on the slide rail. A spring is provided between the slider and the seat body. A guide wheel 6 is also provided on the slider, and the molybdenum wire 3 is wound on the guide wheel 6. As the tension of the molybdenum wire 3 changes, the distance between the slider and the seat body also changes, and the compression degree of the spring also changes accordingly. The locking piece is provided on the slider, and the locking piece will lock the slider and the slide rail so that the slider and the slide rail no longer move relative to each other.

[0040] By locking the tension adjustment mechanism through the locking piece on the tension adjustment mechanism, only one tension adjustment structure in the cutting machine can be operated, that is, unilateral tension control can be performed, which can slow down the effects of thermal stretching and electrical corrosion on the molybdenum wire 3, so that the molybdenum wire 3 will not stretch drastically in a short period of time, reducing the probability of the molybdenum wire 3 breaking, and thus increasing the service life of the molybdenum wire 3.

[0041] Step 300: Acquire the tension release degree of the first tension adjustment mechanism 4.

[0042] The degree of tension release of the tension adjustment mechanism can be obtained by obtaining the degree of compression of the spring. Furthermore, a scale can be provided on the slide rod of the tension adjustment mechanism to facilitate the operator to obtain the degree of tension release of the tension adjustment structure. Furthermore, in this embodiment, the scale value can be set at equal intervals of 14 scales according to the amount that the spring can be compressed, so that the operator can observe.

[0043] Step 400: When the obtained tension release degree of the first tension adjustment mechanism 4 reaches a second value, the reciprocating wire cutting machine is placed in a bilateral control state, wherein the first tension adjustment mechanism 4 and the second tension adjustment mechanism 5 are both in a tension release state.

[0044] As the molybdenum wire 3 continues to be used, the tension of the molybdenum wire 3 decreases under unilateral tension control, reducing the processing accuracy. Therefore, when bilateral tension control is performed in step 400, the effective tension is increased, reducing the shaking degree of the molybdenum wire 3, making the wire cutting process more stable, that is, while increasing the service life of the molybdenum wire 3, it also maintains the processing accuracy of the molybdenum wire 3 to a certain extent, improving the utilization rate of the cutting machine. Therefore, when the release degree of the first tension adjustment mechanism 4 reaches the second value, the locking state of the second tension adjustment mechanism can be released.

[0045] Generally speaking, when the tension of the molybdenum wire 3 decreases, a wire tightening operation is required to increase the tension of the molybdenum wire 3. In this embodiment, the cutting machine is changed from a unilateral control state to a bilateral control state, and the tension of the molybdenum wire 3 is improved, which is equivalent to reducing the step of tightening the wire once and saving the time spent on the wire tightening operation.

[0046] Step 500: Acquire the tension release degrees of the first tension adjustment mechanism 4 and the second tension adjustment mechanism 5 .

[0047] When the cutting machine is in the bilateral control state, the two tension adjustment structures act at the same time, and the compression degrees of the springs on the two tension adjustment structures are similar. When the compression degrees of the springs on the two tension adjustment mechanisms are greatly different, the operator can stop the machine for inspection to reduce the possibility of the molybdenum wire 3 being broken due to the tension adjustment mechanism.

[0048] Step 600 : When the tension release degree of the first tension adjustment mechanism 4 reaches a third value, the wire is tightened through the wire drum 1 .

[0049] When the cutting machine is in bilateral control mode, the molybdenum wire 3 will continue to gradually become thinner with increasing use, resulting in a decrease in the tension of the molybdenum wire 3. Therefore, when the tension release degree of the first tension adjustment mechanism 4 or the second tension adjustment mechanism 5 reaches a certain value, the wire tightening operation is performed to increase the tension of the molybdenum wire 3 and ensure that the molybdenum wire 3 is in a good condition for use. Since the tension release degree of the first tension adjustment mechanism 4 and the second tension adjustment mechanism 5 of the same cutting machine is the same, the operator can select a value after ensuring that there is no significant error in the degree of tension adjustment of the two tension adjustment mechanisms.

[0050] Step 700: After the wire tightening operation, the reciprocating wire cutting machine is placed in a unilateral control state.

[0051] After the wire tightening operation, the tension of the molybdenum wire 3 is significantly increased. Therefore, after the wire is tightened, the first tension adjustment mechanism 4 or the second tension adjustment mechanism 5 is locked, so that the cutting machine remains in a unilateral control state, preventing the molybdenum wire 3 from being broken due to excessive tension. Steps 300 to 700 are repeated until the molybdenum wire 3 breaks.

[0052] It can be understood that in this embodiment, after the diameter of the molybdenum wire 3 is lower than the set value, the cutting machine is changed from the bilateral control state to the unilateral control state to reduce the tension of the molybdenum wire 3, thereby reducing the thermal stretching and electrical corrosion of the molybdenum wire 3 during the cutting process. That is, by alternating between the unilateral control state, the bilateral control state and the wire tightening operation, the tension of the molybdenum wire 3 is maintained at a level that allows cutting operations and is less than the tension of the molybdenum wire 3 when the diameter is greater than the first value, thereby reducing the probability of the molybdenum wire 3 being stretched and broken, improving the service life of the molybdenum wire, reducing the frequency of replacing the molybdenum wire 3 by the cutting machine, and improving the utilization rate of the wire cutting equipment, thereby reducing the cost of using the molybdenum wire.

[0053] In one possible embodiment, after the reciprocating wire cutting machine completes the cutting of a product, the diameter of the molybdenum wire 3 is obtained, that is, the diameter of the molybdenum wire 3 is measured while the cutting machine is stopped. At this time, the molybdenum wire 3 will not shake, the measurement accuracy is high, and safety accidents are less likely to occur. Furthermore, the operator can measure the diameter of the molybdenum wire 3 near the wire drum 1, away from the area where the molybdenum wire 3 is cut, further improving the safety of the measurement. In one possible embodiment, a micrometer is used to obtain the diameter of the molybdenum wire 3, which has high measurement precision and accuracy. Of course, in order to further improve the accuracy of the measurement, the operator can select multiple measurement points to measure the diameter of the molybdenum wire 3, including but not limited to between the wire drum 1 and the first tension adjustment mechanism 4 or the second tension adjustment mechanism 5, and between the first tension adjustment mechanism 4 or the second tension adjustment mechanism 5 and the adjacent wire wheel 2, and select the minimum value measured to compare with the first value. In this embodiment, the first value may be 0.155 mm, 0.158 mm, 0.16 mm, 0.162 mm or 0.165 mm, etc., and the operator may select the value according to the properties of the product 7 to be cut.

[0054] The second value and the third value are both ratios of the spring compression of the tension adjustment mechanism to the natural length of the spring, wherein the second value is smaller than the third value, that is, the control method in this embodiment controls the tension of the molybdenum wire 3 having a diameter lower than the first value in an increasing manner, wherein the tension of the molybdenum wire 3 just switched to the unilateral control state is smaller than the tension of the molybdenum wire 3 switched to the bilateral control state. Furthermore, in this embodiment, the second value is 3 / 7 and the third value is 1 / 2.

[0055] In one possible embodiment, if the diameter of the molybdenum wire 3 obtained is less than the first value, the product cut by the reciprocating wire cutting machine is a product with low precision requirements. When the diameter of the molybdenum wire 3 is greater than the first value, the molybdenum wire 3 is less likely to break, and the tension of the molybdenum wire 3 is stable, and it can be used to cut products with high precision requirements. Considering that the tension of the molybdenum wire 3 decreases over the service life of the molybdenum wire 3 in this embodiment, after the diameter of the molybdenum wire 3 obtained is less than the first value, the operator changes the product to be processed by the cutting machine to other products with relatively low precision requirements, such as sample products, metallographic products, etc., or uses the cutting machine at this time for rough processing, semi-finishing processing, etc. of stators and rotors, thereby improving the utilization rate of the molybdenum wire 3 and saving usage costs.

[0056] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0057] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0058] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0059] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0060] In addition, the terms "first," "second," and so on, used in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0061] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0062] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0063] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A method for controlling a wire-cut molybdenum wire, characterized in that: Applied to a reciprocating wire cutting machine, the reciprocating wire cutting machine includes a wire drum, a first tension adjustment mechanism, a second tension adjustment mechanism and a plurality of guide wheels, the first tension adjustment mechanism and the second tension adjustment mechanism are respectively arranged on both sides of the wire drum, and the molybdenum wire is wound around the wire drum, the guide wheels and the tension adjustment mechanism. When the molybdenum wire is cutting, the first tension adjustment mechanism and the second tension adjustment mechanism are both in a tension-released state. The molybdenum wire control method includes the following steps: Obtaining the diameter of the molybdenum wire; The obtained diameter of the molybdenum wire is smaller than the first value, the reciprocating wire cutting machine is in a unilateral control state, wherein the first tension adjustment mechanism is in a tension release state, and the second tension adjustment mechanism is in a locked state, and the first value is 0.16 mm; obtaining a tension release degree of the first tension adjustment mechanism; When the obtained tension release degree of the first tension adjustment mechanism reaches a second value, the reciprocating wire cutting machine is placed in a bilateral control state, wherein both the first tension adjustment mechanism and the second tension adjustment mechanism are in a tension release state; obtaining tension release degrees of the first tension adjustment mechanism and the second tension adjustment mechanism; When the obtained tension release degree of the first tension adjustment mechanism reaches a third value, the wire is tightened by the wire drum, wherein the second value and the third value are both ratios of the spring compression amount of the tension adjustment mechanism to the natural length of the spring, and the second value is smaller than the third value; After the wire tightening operation, the reciprocating wire cutting machine is placed in a unilateral control state.

2. The method for controlling the wire-cut molybdenum wire according to claim 1, wherein: After the reciprocating wire cutting machine completes cutting of a product, the diameter of the molybdenum wire is obtained.

3. The method for controlling the wire-cut molybdenum wire according to claim 2, characterized in that: The diameter of the molybdenum wire was obtained using a micrometer.

4. The method for controlling a wire-cut molybdenum wire according to claim 1, wherein: Before obtaining the diameter of the molybdenum wire, a plurality of measuring points are determined, and the diameters of the molybdenum wire at the plurality of measuring points are obtained.

5. The method for controlling the wire-cut molybdenum wire according to claim 4, characterized in that: The smallest diameter value among the plurality of measurement points is taken and compared with the first value.

6. The method for controlling a molybdenum wire cut by wire cutting according to claim 1, wherein: The second value is 3 / 7.

7. The method for controlling a molybdenum wire cut by wire cutting according to claim 1, wherein: The third value is 1 / 2.

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