Equipment and method for bending orthodontic steel wire

Abstract

The invention discloses equipment and a method for bending an orthodontic steel wire, and aims to solve the contradiction of strength, stability and precision under the working condition of an extremely short discharge head. The equipment comprises a supporting frame, a discharging head assembly, a first clamping mechanism, a second clamping mechanism, a lever adjusting module and a controller. Through the synergistic combination of the length of the discharging head (5-15 mm), the movement included angle of the lever (30-60 degrees) and feeding compensation (0.2-0.6 mm), non-obvious performance improvement is generated. The lever adjusting module drives the chuck to move along an arc track, downward pressure is generated, and a mechanical closed loop of lever motion included angle-downward pressure-load path is formed to resist cutting impact. And the controller executes feeding compensation based on clamping confirmation, so that the precision is ensured. Tests show that when the cooperative system is used for machining typical orthodontic steel wires, the high material utilization rate (larger than or equal to 95%), the high bending precision (the deviation is smaller than or equal to + / -0.5 degrees) and the long service life (larger than or equal to 5000 times) can be achieved, and the performance outside a parameter window is reduced in a cliff mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wire processing equipment, in particular to a device and method for orthodontic wire bending, which is suitable for high-precision, high-stability and long-service-life processing under the working condition of extremely short discharge head. BACKGROUND

[0002] In the automatic bending of orthodontic wires, in order to pursue high material utilization, it is necessary to shorten the length of the discharge head between the clamping point and the bending die as much as possible. However, the shortening of the length of the discharge head (for example, less than 10 mm) will cause a series of chain problems: stress concentration leading to fatigue cracking, buckling instability of the steel wire affecting forming precision, and timing control problem of double-station clamping in extremely short space. This constitutes an inherent technical contradiction between "structural strength", "process stability" and "processing precision".

[0003] In commercial orthodontic practice, short straight appliances widely use steel wire materials such as AISI 304 stainless steel, cobalt-chromium alloy (Co-Cr) and the like, which have relatively low cost and good formability. The yield strength, springback characteristics and cutting impact force of these materials are significantly different from those of high-cost titanium alloy when they are bent and cut. Therefore, there is an urgent need in the art for a short discharge head bending device that can work stably on such materials.

[0004] Prior art, such as EP4062864A1, provides orthodontic wire bending devices, but the discharge head is relatively long and the material is wasted seriously; US7036409B2 shows a general spring collet structure; EP1762819A1 relates to feeding compensation technology. However, these prior arts are isolated solutions for single technical problems, and they fail to solve the contradiction between strength, stability and precision caused by extremely short discharge head from a system level, and they also fail to disclose that the performance can be synergistically improved through the coupling design of specific parameter windows. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a device and method for orthodontic wire bending, which synchronously realizes structural durability, process stability and high processing precision through the synergistic combination of specific technical features under the premise of extremely short discharge head length (5-15 mm).

[0006] To solve the above problems, the present application adopts the following technical scheme: a device for orthodontic wire bending, The core of the present application is a systematic solution, which includes: a support frame; a discharge head assembly horizontally mounted on the support frame, which defines a wire channel and has a material guiding nozzle, the axial distance L from the end of the material guiding nozzle to the internal clamping point thereof satisfies: 5 mm≤L≤15 mm; A first clamping mechanism, comprising a first elastic clamping member and a sleeve set outside the first elastic clamping member, for clamping the steel wire during the feeding stage; A second clamping mechanism, comprising a second elastic clamping member arranged inside the delivery head assembly and a collet set outside the second elastic clamping member, for clamping the steel wire during the bending or cutting stage; A lever adjustment module, comprising a driving part and a lever mechanism driven thereby, an output end of the lever mechanism being connected with the collet, the lever mechanism being configured to drive the collet to move along an arc trajectory, and an included angle θ between a movement direction of the collet at the moment of closing the second elastic clamping member and a vertical movement trajectory of the cutting knife satisfying: 30°≤θ≤60°; wherein when the collet is driven by the lever mechanism to press the second elastic clamping member, a downward pressure component is applied to the second elastic clamping member, and the downward pressure is transmitted to the support frame through the delivery head assembly and is absorbed; A controller, electrically connected with the first clamping mechanism, the second clamping mechanism and the feeding mechanism, the controller being configured to control the first clamping mechanism and the second clamping mechanism to work in an alternating time sequence, and only after receiving a confirmation signal that the first clamping mechanism has been closed, the controller drives the steel wire to perform feeding compensation Δf, wherein 0.2mm≤Δf≤0.6mm.

[0007] The key innovation of the present application lies in that the parameters L, θ and Δf are not improved in isolation, but constitute a Technical window generating non-obvious synergistic effect. Tests show that only when all three parameters are within the limited range, the device can simultaneously achieve high material utilization rate (≥95%), high bending accuracy (deviation ≤±0.5°) and long service life (≥5000 times). Any single parameter deviating from the preferred window will lead to the synergistic degradation of multiple performance indicators (the decline usually exceeds 20%), showing a "cliff-like decline" feature, which proves that the synergistic effect generated by the three as an integrated system exceeds the effect expected by the person skilled in the art based on conventional optimization.

[0008] Advantages The application shows performance improvement beyond linear superposition through the synergy of the discharge head length L, the lever motion angle θ and the feeding compensation Δf within a certain range: through the design of a specific angle θ (30°-60°), the lever motion not only generates a clamping force, but more importantly, generates a clear downward pressure (F1y), which is transmitted and dissipated through the specially designed load path of "clamp head → second elastic clamp → discharge head tail → discharge head mounting shoulder → support frame" to form a complete "θ-F1y-load path" mechanical closed loop. This closed loop will convert the destructive energy of impact into stable structural pressure, making it possible to use extremely short discharge head length (L=5-15mm) while ensuring long service life.

[0009] Conversely, the extremely short discharge head makes the two-stage alternating clamping and Δf compensation necessary to maintain bending accuracy. These three core features and their parameter ranges are interdependent, forming a deeply coupled system.

[0010] Test data (see Table 1) shows that when processing typical orthodontic wire materials (such as 304 stainless steel, cobalt-chromium alloy), the optimal parameter combination (θ=45°, L=6mm, Δf=0.4mm) can achieve a material utilization rate of not less than 98.2%, a bending angle deviation within ±0.3°, and a durability of not less than 8000 times. The comparative examples outside the parameter window (such as Comparative Examples 4-7) show a significant and simultaneous decline in performance, proving that the synergy effect is not obvious.

[0011] The application can use long straight wires (such as 50cm, 80cm or longer) to improve material utilization. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is the first perspective view of the orthodontic wire bending device with an extremely short discharge head of the application; Figure 2 is an enlarged view of the discharge head assembly structure; Figure 3 is a structure diagram of the discharge head assembly and the lever adjustment module; Figure 4 is a structure diagram of the first clamping mechanism and the lever mechanism; Figure 5 is an enlarged view of the structure of the first clamping mechanism; Figure 6 is an enlarged view of the structure of the second clamping mechanism; Figure 7 is a partial structure diagram of the second elastic clamp; Figure 8 is a timing synergy and parameter synergy effect diagram; Figure 9is a schematic diagram of the angle between the load path and the lever movement.

[0013] Reference signs: 001, steel wire; 100, support frame; 103, end; 104, clamping point; 231, first clamping mechanism; 241, first elastic clamping piece; 242, sleeve; 232, second clamping mechanism; 250, feeding mechanism; 260, feeding mechanism; 500, discharge head assembly; 510, guide nozzle; 511, discharge head mounting shoulder; 512, discharge head tail; 513, mounting seat; 520, second elastic clamping piece; 530, lever adjusting module; 550, driving part; 560, lever mechanism; 531, air cylinder; 533, connecting rod; 534, rotating shaft; 540, chuck; 580, guide groove; 600, cutter. DETAILED DESCRIPTION

[0014] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0015] It should be noted that when an assembly is referred to as "provided on" or "sleeved on" another assembly, it can be directly on the other assembly or there can be a middle assembly. When an assembly is referred to as "connected to" another assembly, it can be directly connected to the other assembly or there can be a middle assembly. The terms "horizontal", "up", "down" and similar expressions used in the specification of the present application are only for the purpose of illustration and do not indicate the only implementation.

[0016] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features.

[0017] In the present application, unless otherwise explicitly specified and limited, the first feature is "on", "under" the second feature can be the first feature directly and the second feature contact, or the first feature and the second feature indirectly through the intermediate medium contact. Moreover, the first feature is "on", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature is "under", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or only indicates that the first feature is less than the second feature in horizontal height.

[0018] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more related listed items.

[0019] The preferred embodiments of the device and method for orthodontic wire bending provided by the present application are described in detail below in conjunction with the accompanying drawings. This part of the description is intended to provide specific details for understanding the present application, but should not be construed as limiting the scope of protection of the claims.

[0020] Overall structural layout and workflow overview Referring to Figure 1 , the core architecture of the device includes a support frame 100, an outlet head assembly 500, a first clamping mechanism 231, a second clamping mechanism 232, a lever adjustment module 530 and a controller. The steel wire 001 is sent from the feeding mechanism 250, sequentially passes through the first clamping mechanism 231, the channel inside the outlet head assembly 500, and extends from the end 103 of the guide nozzle 510.

[0021] The operation of the device follows a precise timing cycle (as shown in Figure 8 ): 1. Feeding stage: the first clamping mechanism 231 is closed, clamping the steel wire and pushing it forward to send out a predetermined length; at this time, the second clamping mechanism 232 is in an open state and does not contact the steel wire.

[0022] 2. Switching and clamping stage: the first clamping mechanism 231 is opened, at the same time, the lever adjustment module 530 is actuated to drive the second clamping mechanism 232 to close tightly clamping the steel wire.

[0023] 3. Feeding compensation stage: after the first clamping mechanism 231 is closed again in the "switching to bending / cutting stage", the controller drives the feeding mechanism to perform feeding compensation Δf (0.2-0.6mm) after receiving its closing confirmation signal (such as from a position sensor).

[0024] 4. Bending / cutting phase: under the stable clamping of the second clamping mechanism 232, the bending action is performed. When a segment of archwire is bent to completion, the cutting knife 600 descends to cut the finished product.

[0025] Detailed description of each component 1. The discharge head assembly 500 and the critical length L As shown in the enlarged view of Figure 2 and Figure 3 The discharge head assembly 500 is the key component to solve the strength problem of extremely short discharge head. Its core is the guide nozzle 510, which is fixed on the base body of the discharge head assembly by means of thread or interference fit, etc. The guide nozzle 510 is internally provided with an accurate steel wire channel, the inner diameter of which matches the diameter of the steel wire (for example, a gap of 0.1-0.2 mm is left) to provide good guiding effect while avoiding jamming. The discharge head length L (the end 103 of the guide nozzle 510 to the clamping point 104) is set to 5-15 mm, preferably 6 mm. This "critical length" is the performance boundary verified by a large number of finite element analysis and durability tests, and its selection is not a conventional design in the field.

[0026] The distance from the end 103 of the guide nozzle 510 to the clamping point 104 is defined as the discharge head length L. The clamping point 104 is the axial position where the second elastic clamping piece 520 effectively contacts the steel wire and exerts clamping force when closed.

[0027] When L is less than 5 mm (such as Comparative Example 5, L = 4 mm), although the material utilization rate is slightly improved, the stress concentration phenomenon at the root of the guide nozzle is deteriorated sharply, and it is rapidly fatigued and cracked under repeated cutting impact, with a service life of about 2500 times, which cannot meet the needs of clinical mass production.

[0028] When L is greater than 15 mm (such as Comparative Example 6, L = 16 mm), the overhanging segment is too long, and the steel wire is prone to axial buckling and radial jumping during bending, resulting in a significant decrease in bending accuracy (deviation up to ±1.6°), and the material utilization rate drops to about 89%.

[0029] Therefore, L = 5-15 mm is an unexpected key parameter window to achieve a balance among high material utilization rate, high precision and long service life. The guide nozzle 510 must be made of a material with high yield strength and fracture toughness, such as precipitation hardened stainless steel (such as 17-4PH, H900 state). Its minimum wall thickness is controlled between 0.8 mm and 1.2 mm to balance structural strength and internal channel space.

[0030] 2. The mechanical function of the lever adjustment module 530 and the included angle θ As shown in the enlarged view of Figure 3 ,Figure 6 and Figure 9 As shown, the lever adjustment module 530 is the core of realizing the mechanical closed loop. It includes a cylinder 531 as a drive unit 550, and a lever mechanism 560 consisting of a connecting rod 533 and a rotating shaft 534. The rotating shaft 534 is fixed to the support frame 100, one end of the connecting rod 533 is hinged to the piston rod of the cylinder 531, and the other end is fixedly connected to the chuck 540.

[0031] When cylinder 531 is activated, it pushes connecting rod 533, causing chuck 540 to move along an arc trajectory around rotation axis 534. One of the most critical design features of this invention is that when chuck 540 moves to the moment it contacts the second elastic clamping member 520 and begins to apply pressure, its direction of movement forms an angle θ with the vertical direction of movement of cutter 600. This θ is limited to between 30° and 60°, preferably 45°.

[0032] This angular configuration produces a crucial mechanical effect: Forward component force (F1x): used to compress the second elastic clamp 520 to produce radial contraction, thereby reliably clamping the wire.

[0033] The downward force (F1y) is transmitted through the second elastic clamp 520 to the outer wall of the discharge head tail 512 of the discharge head assembly 500, and then through its discharge head mounting shoulder 511 to the support frame 100 and is absorbed.

[0034] like Figure 9 As indicated by the middle arrow, this specially constructed load path allows the system to provide a downward pressure in the opposite direction with a clearly defined path to actively resist the impact at the instant the cutter 600 strikes and cuts the steel wire. This is equivalent to providing a "pre-tightening support" for the fragile, extremely short discharge head, converting the destructive impact energy into compressive stress that stabilizes the structure, thereby greatly improving the fatigue life of the discharge head. Comparative Example 4 (θ=25°) suffers from insufficient downward force, resulting in significantly inferior impact resistance and lifespan (approximately 6000 cycles) compared to this invention.

[0035] 3. The first and second clamping mechanisms and their coordination like Figure 4 , Figure 5 As shown, the first clamping mechanism 231 adopts a similar structure of elastic clamping member 241 and sleeve 242, but its main function is to feed materials, so its driving and releasing sequence is completely staggered from that of the second clamping mechanism 232.

[0036] like Figure 6 , Figure 7As shown, the second elastic clamp 520 is machined with an inverted tapered guide groove 580, with a taper angle of 15° to 30°. This design can extremely smoothly guide the steel wire to the center of the clamp, effectively preventing the end of the steel wire from hitting the edge of the clamp during high-speed feeding, which can cause jamming or feeding failure, which is crucial for achieving full automation.

[0037] 4. Hard interlock of controller with feeding compensation Δf The controller (such as PLC or embedded industrial computer) is programmed to execute Figure 8 the precise timing shown. The execution logic of the feeding compensation Δf is particularly critical. The controller is configured to only drive the feeding motor to execute a small feeding compensation (Δf = 0.2-0.6mm, preferably 0.4mm) after receiving a confirmation signal that the first clamping mechanism 231 has been completely closed in place.

[0038] This "hard interlock" mechanism ensures that the compensation action is always performed in a state where the steel wire is reliably clamped, avoiding the sliding, rebounding or position uncertainty that may occur when the steel wire is pushed in a free state. This micron-level compensation amount is used to offset the slight shrinkage that may occur when the steel wire switches from the second clamping point to the first clamping point, as well as the gap of the system itself, thereby ensuring the axial positioning accuracy of the final bending point. Comparative Example 7 (Δf = 0.1mm) has poor bending stability and precision drops to ±1.1° due to insufficient compensation.

[0039] Performance test and synergistic effect verification To objectively evaluate the effect of the invention, the following test standards are defined: Test reference steel wire: AISI 304 stainless steel wire and cobalt-chromium alloy (Co-Cr) steel wire (nominal diameter 0.7mm, 0.8mm, 0.9mm), representing a large category of medium-strength materials in the orthodontic field.

[0040] Material utilization rate: calculated as (effective length of finished steel wire / total length of consumed raw material) x 100%.

[0041] Bending precision: use a 2D optical projector (precision ±0.01°) to measure the absolute deviation of each bending angle of the finished steel wire from the target angle, and report the average value of the absolute values of the deviations of 10 samples.

[0042] Equipment life: defined as the number of cycles until the discharge head assembly (500) appears visible cracks or functional failure under standard test conditions (bending diameter 0.8mm of 304 stainless steel wire, frequency 60 times / minute) .

[0043] The systematic test data in Table 1 fully demonstrate the strong synergistic effect among the three core parameters (L, θ, Δf) of the present application. Only when all three are within the preferred window defined by the present application, can the device achieve the optimal performance in material utilization, bending accuracy and service life, which are three mutually contradictory performance indicators.

[0044] Table 1: Parameter Synergy Window Performance Test Results (based on 304 stainless steel wire, n=10, data expressed as mean ± standard deviation) Test group Parameter combination (θ, L, Δf) Material utilization rate Bending accuracy (average deviation) Service life (to crack) Comprehensive performance η Remarks and failure mode analysis 1 (Invention - optimal) 45°, 6mm, 0.4mm 98.2±0.6% 0.3±0.1° >8000 times 0.95 Performance benchmark, stable operation. 2 (Invention - boundary) 30°, 8mm, 0.6mm 96.5±0.7% 0.4±0.1° ~7000 times 0.87 Proves that the scope of the claims is feasible. 3 (Invention - boundary) 60°, 5mm, 0.2mm 97.0±0.6% 0.5±0.1° ~4500 times 0.8 Proves that the scope of the claims is feasible. 4 (Comparison) 25°, 6mm, 0.4mm 95.5±0.8% 0.9±0.2° ~6000 times 0.72 θ is too small, insufficient downward pressure, accuracy and service life are reduced. 5 (Comparison) 45°, 4mm, 0.4mm 98.5±0.4% 0.5±0.1° ~2500 times 0.62 L is too small, insufficient structural strength, service life is significantly shortened. 6 (Comparison) 45°, 16mm, 0.4mm 89.0±1.2% 1.6±0.3° >10000 times 0.68 L is too long, material utilization rate and accuracy are significantly degraded. 7 (Comparison) 45°, 6mm, 0.1mm 95.8±0.9% 1.1±0.2° >8000 times 0.78 Δf is too small, insufficient compensation, poor bending stability. Note 1: The comprehensive performance η is the geometric mean of material utilization, bending accuracy (reciprocal) and service life (standardized), used for comprehensive evaluation. The calculation formula of comprehensive performance η is: η = (material utilization x bending accuracy reciprocal x service life standardized value)^(1 / 3), wherein service life standardized value = actual test life / 8000 times. The "cliff-like drop" of performance η is direct evidence of the existence of synergistic effect.

[0045] Note 2: Comparative tests were conducted using cobalt-chromium alloy wire, and the results showed that the bending accuracy and service life indicators were consistent with the trend and similar in value to the 304 stainless steel wire test group.

[0046] Conclusion: Table 1 data proves that θ = 30°-60°, L = 5-8 mm, Δf = 0.2-0.6 mm form a high-performance synergy region. Even at the boundary points (test groups 2, 3), the performance is significantly better than the comparative examples outside the window. This effect shows that the combination of the three parameters within the window defined by the present application produces a synergistic technical effect beyond the expectations of those skilled in the art when processing representative clinical orthodontic wire materials such as 304 stainless steel and cobalt-chromium alloy. The absence or deviation of any single feature from the parameter window will result in a synergistic degradation of system performance, rather than a linear decline in performance, which strongly indicates the non-obviousness of the technical solution of the present application.

[0047] Examples The following examples and comparative examples all use the test reference wire defined above (mainly 0.8 mm 304 stainless steel wire) and the same test environment to ensure the comparability of the results.

[0048] Example 1: Parameters θ = 45°, L = 6 mm, Δf = 0.4 mm are used. A 0.8 mm diameter 304 stainless steel orthodontic wire is processed, and the results are as follows: test group 1, material utilization > 98%, bending accuracy ± 0.3°, service life > 8000 times.

[0049] Example 2 (comparative example): θ = 25°, L = 6 mm, Δf = 0.4 mm. The die head life was reduced to about 6000 times due to insufficient downward pressure, and the bending accuracy was reduced to ±0.9°, as in test group 4.

[0050] To verify the synergistic effect of the present application, the following comparative examples were set up: Comparative example 4: θ = 25°, L = 6 mm, Δf = 0.4 mm; Comparative example 5: θ = 45°, L = 4 mm, Δf = 0.4 mm; Comparative example 6: θ = 45°, L = 16 mm, Δf = 0.4 mm; Comparative example 7: θ = 45°, L = 6 mm, Δf = 0.1 mm.

[0051] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not contradict each other, they should be considered within the scope of the present disclosure.

[0052] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the scope of the present application should be subject to the appended claims.

Claims

1. An apparatus for orthodontic wire bending, comprising a support frame, a delivery head assembly, a first clamping mechanism, a second clamping mechanism, a lever adjustment module and a controller, characterized in that: the delivery head assembly is horizontally mounted on the support frame, defining a wire channel and having a delivery nozzle, an axial distance L from the end of the delivery nozzle to its internal clamping point satisfying: 5mm≤L≤15mm; the first clamping mechanism comprises a first elastic clamping member and a sleeve set outside the first elastic clamping member, for clamping the wire during the feeding stage; the second clamping mechanism comprises a second elastic clamping member arranged inside the delivery head assembly and a collet set outside the second elastic clamping member; the lever adjustment module comprises a driving part and a lever mechanism driven by the driving part, the output end of the lever mechanism being connected with the collet, the lever mechanism being configured to drive the collet to move along a substantially circular arc trajectory, and an included angle θ between the instantaneous movement direction of the collet when pressing the second elastic clamping member to close and the vertical movement trajectory of the cutting knife satisfying: 30°≤θ≤60°, wherein when the collet is driven by the lever mechanism to press the second elastic clamping member, a downward pressure component (F1y) is applied to the second elastic clamping member, which is transmitted to the support frame through the delivery head assembly and is absorbed; the controller is electrically connected with the first clamping mechanism, the second clamping mechanism and the feeding mechanism, and is configured to control the first clamping mechanism and the second clamping mechanism to work in an alternating time sequence, and only after receiving a confirmation signal that the first clamping mechanism has closed, the controller drives the wire to perform a feeding compensation Δf, wherein 0.2mm≤Δf≤0.6mm.

2. The apparatus of claim 1, wherein, The driving part of the lever adjustment module is a pneumatic cylinder, and the lever mechanism comprises a connecting rod and a rotating shaft, the connecting rod being mounted on the support frame through the rotating shaft, one end of the connecting rod being hinged to the output end of the pneumatic cylinder, and the other end of the connecting rod being fixedly connected with the collet.

3. The apparatus of claim 1, wherein, The delivery nozzle of the delivery head assembly is made of precipitation hardened stainless steel or a material having equivalent yield strength and fracture toughness, and the minimum wall thickness is between 0.8mm and 1.2mm.

4. The apparatus of claim 1, wherein, The end of the first elastic clamping member and the end of the second elastic clamping member are both provided with an inverted tapered guide groove.

5. The apparatus of claim 4, wherein, The taper angle of the inverted tapered guide groove is 15° to 30°.

6. The apparatus of claim 1, wherein, The distance L satisfies: 10mm≤L≤15mm.

7. The apparatus of claim 1, wherein, The included angle θ is 45°.

8. The apparatus of claim 1, wherein, The feeding compensation Δf is 0.3mm to 0.5mm.

9. A method for controlling the apparatus according to any one of claims 1 to 8, characterized by, The steps include: feeding stage: control the first clamping mechanism to close to clamp and transport the wire, while controlling the second clamping mechanism to be in an open state; switching to the bending / cutting stage: control the first clamping mechanism to open, and drive the collet to move by the lever adjustment module to press the second elastic clamping member to close to clamp the wire; feeding compensation stage: after the first clamping mechanism is closed, the controller drives the wire to perform the feeding compensation Δf after receiving a confirmation signal that the first clamping mechanism is closed; performing bending and / or cutting operation.

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