Multifunctional machine head mechanism driven by linear motor

Abstract

The utility model discloses a multifunctional machine head mechanism driven by a linear motor, belongs to the field of numerical control machining, and aims to solve the problems that the motion trail of a rotor is changed and the machining precision of the machine head mechanism is reduced due to small deformation of the machine head mechanism caused by normal suction force. According to the technical scheme, the machine head is characterized by comprising a machine head body, and a magnetic plate installation face is fixedly arranged at the position, corresponding to a linear motor, of the machine head body and located in the middle of the machine head. According to the magnetic plate mounting surface center layout and golden section ratio guide rail system, the normal suction uniformity is improved by 82% (according to a finite element analysis result), the dynamic stiffness of the guide rail reaches 250N / mu m (improved by 25% compared with the traditional design), and the positioning precision stability under 200Hz vibration is improved by three times, so that the machining precision of a machine head mechanism is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to numerical control processing field, more specifically, it relates to a linear motor driven multifunctional head mechanism. BACKGROUND

[0002] The head mechanism is the core component of the numerical control machine tool, is responsible for executing cutting processing task, and the existing head mechanism includes linear motor drive and ball screw drive drive mode, and the existing linear motor drive can directly generate linear motion, does not need screw conversion, acceleration is high (can reach 10g), is suitable for high dynamic processing, thereby can better adapt to the demand of present numerical control machine tool.

[0003] But the existing linear motor runs, due to the action of electromagnetic field, normal attractive force between the mover and the stator is generated, and the normal attractive force causes the tiny deformation of the head mechanism, thereby changing the motion trajectory of the mover, and reducing the machining precision of the head mechanism.

[0004] Therefore, a new scheme needs to be proposed to solve this problem. UTILITY MODEL CONTENT

[0005] In view of the defects in the prior art, the utility model aims at solving the above problems and provides a linear motor driven multifunctional head mechanism.

[0006] The utility model achieves the above-mentioned purposes through the following technical schemes: a linear motor driven multifunctional head mechanism, comprising a head main body, the head main body is fixedly provided with a magnetic plate mounting face at the position corresponding to the linear motor, and the magnetic plate mounting face is located in the middle part of the head.

[0007] The utility model is further provided as follows: the head main body is symmetrically provided with linear guide rails at the two sides of the magnetic plate mounting face, and the span of the linear guide rail is 1.618 times the width of the magnetic plate mounting face.

[0008] The utility model is further provided as follows: the head main body is fixedly connected with an optical ruler mounting frame on the right side.

[0009] The utility model is further provided as follows: the head main body is fixedly provided with a cylinder connecting part on the two sides, which is used for connecting the counterweight cylinder on the slide seat of the numerical control machining center.

[0010] The utility model is further provided as follows: the head main body is connected with an engineering drag chain on the top, which is used for penetrating cable and pipeline, and the engineering drag chain is fixedly provided with a separation plate for gas-liquid-electric separation.

[0011] The utility model is further provided as follows: the bending radius of the engineering drag chain is greater than or equal to the diameter of the cable, and the bending radius of the engineering drag chain is the minimum radius of the inside of the cable when bending.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] First, the head main body is made of HT300 pearlite gray cast iron, the shock absorption efficiency is improved by 40% (compared with ordinary gray cast iron) by using the shock absorption and self-lubricating effect of flaky graphite, the wear resistance is improved by 2.3 times (based on ASTM G65 test standard), and the size stability retention rate is kept at more than 98% under long-term alternating load;

[0014] Second, the magnetic plate mounting surface center layout + golden section ratio guide rail system, the normal attraction uniformity is improved by 82% (finite element analysis result), the guide rail dynamic stiffness reaches 250N / μm (compared with traditional design, improved by 25%), and the positioning precision stability is improved by 3 times under 200Hz vibration;

[0015] Third, Abbe principle layout + double reading head differential measurement, the Abbe error of 0.005mm / m is eliminated, the repeat positioning precision is ±0.5μm under 120m / min high speed;

[0016] Fourth, the engineering drag chain 8 times bending radius design, the cable mechanical fatigue life is prolonged by 5 times, the electromagnetic interference shielding efficiency is improved by 12dB, and the cable failure rate is reduced by 83%. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the structure schematic view of the utility model;

[0018] Figure 2 It is the structure schematic view of the utility model;

[0019] Figure 3 It is the section structure schematic view of engineering drag chain.

[0020] Fig. 1, head main body; 2, magnetic plate mounting surface; 3, linear guide rail; 4, optical ruler mounting frame; 5, cylinder connecting part; 6, engineering drag chain; 7, partition plate. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described in the description of the utility model, and it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the utility model and simplify the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. Obviously, the described embodiments are only some of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model. Embodiments

[0022] A linear motor driven multifunctional handpiece mechanism, as shown in Figures 1-3 , comprises a handpiece body 1, the handpiece body 1 is made of HT300 cast material, HT300 belongs to pearlite gray cast iron, the graphite morphology is distributed in the form of sheet, the sheet graphite structure gives the material two characteristics: first, excellent shock absorption can absorb vibration energy; second, the graphite self-lubricating effect significantly improves the wear resistance, so that the vibration formed by the operation of the linear motor can be better eliminated, and the size stability of the handpiece body 1 under long-term alternating load can be ensured.

[0023] Meanwhile, as shown in Figure 2 , the handpiece body 1 is fixedly provided with a magnetic plate mounting surface 2 at the position corresponding to the linear motor, the normal stiffness can be improved through the magnetic plate mounting surface 2, the normal suction force generated by the linear motor can be effectively resisted, and the magnetic plate mounting surface 2 is located in the middle of the handpiece, the linear motor is also located in the middle of the handpiece at the corresponding position of the handpiece body 1, so that when the linear motor is not centrally installed, according to the finite element analysis, about 15% of the non-uniform stress deviation of the normal suction force will be caused, the non-uniform stress distribution of the normal suction force will be caused on the magnetic plate mounting surface 2, local plastic deformation will be caused, the effect of protecting the size stability is achieved, and the machining precision of the handpiece mechanism is further improved.

[0024] As shown in Figures 1-2 , the handpiece body 1 is symmetrically provided with a linear guide rail 3 on both sides of the magnetic plate mounting surface 2, and the span of the linear guide rail 3 is 1.618 times the width of the magnetic plate mounting surface 2 to form a golden section ratio, and the dynamic stiffness of the guide rail system is improved by about 25% in the golden section ratio layout, under the same vibration energy input, the displacement amount of the mover is reduced to 1 / 3 of the traditional design, and the positioning precision stability is directly improved.

[0025] Meanwhile, the magnetic nonlinear response of the magnetic plate mounting surface 2 under high-frequency vibration can be enhanced. Experiments show that under 200Hz vibration, the damping ratio of the optimized system is improved by 0.12-0.18, and the vibration decay time is shortened by 40%. The proportional layout not only improves the mechanical performance, but also has significant advantages in electromagnetic characteristics. Moreover, the golden section ratio design makes the eddy current distribution more uniform, and the eddy current loss is reduced by 35% at a high frequency of >200Hz, reducing the influence of thermal deformation on positioning accuracy.

[0026] After optimization, the suppression efficiency of the linear guide rail 3 on the edge magnetic leakage of the magnetic plate mounting surface 2 is improved by 60%, and the axial symmetry of the magnetic field is still maintained under high-frequency vibration, ensuring the stability of suspension.

[0027] As shown in Figures 1-2 , the optical ruler mounting rack 4 is fixedly connected to the right side of the head body 1, the diffraction grating ruler is installed on the optical ruler mounting rack 4, and the position of the optical ruler mounting rack 4 is such that the diffraction grating ruler and the linear motor form an Abbe principle layout, the measurement line and the motion line are overlapped, the Abbe error of 0.005mm / m in the traditional design is eliminated, the double reading head differential measurement is configured, and the repeat positioning accuracy of ±0.5μm is still maintained under high-speed motion of 120m / min, thereby improving the machining precision of the head mechanism.

[0028] Meanwhile, as shown in Figures 1-2 , the air cylinder connecting parts 5 are fixedly arranged on both sides of the head body 1, which are used to connect the counterweight air cylinders on the slide of the numerical control machining center, realize pressure dynamic compensation, increase the balance efficiency, improve the positioning accuracy, and further improve the machining precision of the head mechanism.

[0029] As shown in Figures 1-2 , the engineering drag chain 6 is connected to the top of the head body 1, which is used to pass through the cable and pipeline, and as shown in Figure 3 , the engineering drag chain 6 is fixedly provided with a partition plate 7 for gas-liquid-electric separation, which solves the cable winding problem of the traditional drag chain, and the bending radius of the engineering drag chain 6 is ≥8 times the diameter of the cable. The bending radius of the engineering drag chain 6 is the minimum radius of the cable inside when bending. When the cable bends, the inside is compressed stress and the outside is tensile stress. When the bending radius is too small, such as <5 times the diameter, the interface between the conductor and the insulation layer will produce shear stress concentration, which will cause micro cracks in the insulation layer and processing hardening of the copper conductor due to repeated stretching. The 8 times bending radius can reduce the maximum local stress to 1 / 16 of the straight cable state, effectively avoiding mechanical fatigue.

[0030] Moreover, for multi-core cables, relative sliding will occur between the wire cores when bending, and the 8 times radius design can ensure that the wire core displacement is <5% of the conductor diameter and prevent local resistance mutation caused by single wire fracture (avoiding spark risk).

[0031] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, the scope of the present application being defined by the claims appended hereto rather than by the above description, and all the changes which fall within the meaning and the scope of the equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0032] Furthermore, it should be understood that although the present specification describes exemplary embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that a person skilled in the art can understand.

Claims

1. A multi-functional handpiece mechanism driven by a linear motor, comprising a handpiece main body (1), characterized in that: The head body (1) is fixedly provided with a magnetic plate mounting surface (2) corresponding to the linear motor position, and the magnetic plate mounting surface (2) is located in the middle of the head.

2. A multi-functional handpiece mechanism driven by a linear motor according to claim 1, characterized in that: The head body (1) is symmetrically provided with linear guide rails (3) on both sides of the magnetic plate mounting surface (2), and the span of the linear guide rail (3) is 1.618 times the width of the magnetic plate mounting surface (2).

3. A multi-functional handpiece mechanism driven by a linear motor according to claim 1, characterized in that: The head body (1) is fixedly connected with an optical ruler mounting rack (4) on the right side.

4. A multi-functional handpiece mechanism driven by a linear motor according to claim 1, characterized in that: The head body (1) is fixedly provided with a cylinder connecting part (5) on both sides, which is used for connecting the counterweight cylinder on the slide of the numerical control machining center.

5. A multi-functional handpiece mechanism driven by a linear motor according to claim 1, characterized in that: The head body (1) is connected with an engineering drag chain (6) at the top, which is used for penetrating cables and pipelines, and the engineering drag chain (6) is fixedly provided with a separation plate (7) for gas-liquid-electric separation.

6. A multi-functional handpiece mechanism driven by a linear motor according to claim 5, characterized in that: The bending radius of the engineering drag chain (6) is greater than 8 times the diameter of the cable, and the bending radius of the engineering drag chain (6) is the minimum radius of the inside of the cable when bending.

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