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SN Applied Sciences

, 1:1571 | Cite as

Experiment and model of cutting force of heavy-duty milling water chamber head material

  • Yaonan ChengEmail author
  • Chunyang Li
  • Qihang Yuan
  • Qiyao Lv
  • Li Liu
Research Article
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Part of the following topical collections:
  1. 3. Engineering (general)

Abstract

The cyclic impact load of cutting force is one of the main factors that lead to the insert failure during the milling process. According to the asymmetrical heavy-duty milling process of water chamber head, the simulation milling experiments using actual machining parameters are conducted under laboratory conditions, and the change rule of milling force with cutting parameters is analyzed. Moreover, the simulation of interrupted cutting is carried out to study the cycle changes of cutting force and stress distribution of insert during the insert cutting-in and cutting-out workpiece. The dynamic cutting force model is established by considering the irregularity of the cutting area of circular insert and the variation of asymmetric milling thickness. Based on the analysis of comparison between the calculated value of the model and the experimental value, the cutting force model can describe the dynamic change of cutting force in milling process. It is of great significance to analyze and master the changing trend of dynamic cutting force for the study of insert failure and the formulation of reasonable processing parameters in milling process.

Keywords

Heavy-duty milling Water chamber head Cutting force Cutting simulation Cutting state 

List of symbols

vc

Cutting speed (m/min)

fz

Feed per tooth (mm/z)

n

Spindle revolving speed (r/min)

vf

Feed speed (m/min)

ap

Axial cutting depth (mm)

ae

Radial cutting depth (mm)

γf

Side rake angle (degree)

γp

Back rake angle (degree)

κr

Cutting edge angle (degree)

δ

Cutting-in angle (degree)

θ

Cutting-out angle (degree)

γ0

Rake angle (degree)

α0

Relief angle (degree)

Fc

Main cutting force (N)

Ff,

Feed direction cutting force (N)

Fp

Depth direction cutting force (N)

τs

Shear stress (MPa)

Fsh

Shear force (N)

As

Main shear area (mm2)

AD

Cutting area (mm2)

\(A_{D}^{{\prime }}\)

Cutting area based on asymmetric milling (mm2)

β

Friction angle (degree)

ϕ

Shear angle (degree)

hD

Cutting thickness (mm)

θ0,θ1,θ2

Used to calculate cutting area AD (degree)

θ’

Cutter position angle based on asymmetric milling (degree)

\(\theta_{0}^{{\prime }} ,\theta_{1}^{{\prime }} ,\theta_{2}^{{\prime }}\)

Used to calculate cutting area \(A_{D}^{{\prime }}\) based on asymmetric milling (degree)

R

Radius of circular insert (degree)

Rc

Cutter diameter (mm)

\(h_{D}^{{\prime }}\)

Cutting thickness based on asymmetric milling (mm)

\(f_{z}^{{\prime }}\)

Feed per tooth based on asymmetric milling (mm/z)

1 Introduction

The water chamber head is critical part of nuclear evaporator, and is made of special high strength 508 III steel. The workpiece blank is integral forging, and the size and weight are very large, which has special processing difficulty [1]. The manufacturing process is determined to be extremely manufacturing by the large size and working allowance of the part and the excellent function and special workability of material. The parts are processed mainly for heavy-duty milling, as shown in Fig. 1. During the heavy-duty milling process, the insert is subjected to huge cyclic force-thermal shock loading which causes the serious failure of the insert, as shown in Fig. 2. The cutting efficiency of water chamber head is seriously restricted and the processing cost is increased. The dynamic cutting force that the insert cutting-in and cutting-out the workpiece is one of the main factors of insert failure [2]. In the research of part cutting technology and insert technology, the cutting force model is usually established, and the insert failure is studied by combining simulation technology and cutting force data measured by cutting test [3, 4]. Although the data of cutting experiment is reliable, a large number of experimental data are needed for the research of tool failure and the formulation of reasonable machining parameters. While the model based on the theory of cutting mechanics needs to determine many unknown parameters, the improvement of the theoretical model is convenient, and the physical behavior in cutting can be better predicted and analyzed. Therefore, the establishment of cutting force model plays an important role in the analysis of metal cutting process.
Fig. 1

Heavy-duty milling of water chamber head

Fig. 2

Failure of inserts during milling process

At present, the main principles of the modeling of cutting force are model based on the stress–strain relationship of workpiece material and cutting mechanics; the mechanical model of irregular cutting area established by means of unit cutting force integral; the model built by artificial neural networks [5]. Adem et al. [6] proposed a linear and nonlinear mathematical force model for end milling verified by experiment. Hao et al. [7] proposed a new method for predicting milling force of surface with variable curvature. Matsumura et al. [8] established the prediction model of cutting force based on chip flow model and energy dissipation model in the milling process of complex shape section. Dong et al. [9] predicted the cutting forces during milling thin-walled part using different diameter milling cutters. Ghorbani et al. [10] established the milling force model of circular insert adopting the method of unit cutting force coefficient. Lee et al. [11] considered the friction of the cutting edge, proposed the cutting edge force of the cutting edge, and improved the mechanical model of the cutting force. Wang et al. [12] studied the three-dimensional cutting force prediction model of spiral edge milling cutter based on Merchant oblique cutting theory. Dang et al. [13] established planar milling force model considering both the bottom and side edges, and they had the conclusion that the cutting force of the bottom edge is proportional to the edge length.

Liu et al. [14, 15, 16] based on the geometric analysis of ball end milling cutter and the principle of orthogonal cutting, considering the size effect of undeformed chip thickness and the effect of effective rake angle, proposed an improved theoretical dynamic cutting force model. In the further experimental verification and application of the above model, it is found that the cutting vibration has an important influence on the dynamic cutting force. Therefore, considering the influence of the tool vibration on the machined surface, the theoretical model is improved. In order to ensure the integrity of machining dynamics, the influence of cutting parameters and the vibration of tool and workpiece on the cutting force is considered comprehensively. The dynamic simulation model is established by using Simulink software and verified by experiments. Saffar et al. [17] researched the three-dimensional cutting force and deformation of milling cutter by using the finite element simulation and experiment method, and determined that the simulation method can be used to predict the cutting force and cutter deformation. Boyd et al. [18] improved the prediction of cutting force through orthogonal cutting simulation and measured heat-mechanical load.

Generally, the established milling force models didn’t indicate the change of cutting thickness in the cutting-in and cutting-out process, thus it was not possible to accurately describe the change of cutting force during interrupted cutting process. The dynamic milling force model was established based on the change of cutting thickness during asymmetric milling process of water chamber head material with method of cutting force experiments and intermittent cutting simulation. The results can provide basis for the research of insert failure.

2 Milling experiments of water chamber head material

2.1 Design of milling test scheme

Under the laboratory conditions, the simulation experiments of heavy-duty milling water chamber head material are conducted using cutting parameters in the factory so as to determine the cutting force load during milling process. The experiments adopts XW5032 vertical milling machine. The main spindle revolving speed range of machine tool is 30–1180 r/min, and the feed speed range is 0–1 m/min. The workpiece material is 508III steel, and the size is 150 × 100 × 100 mm. The cutting force is measured by the Kistler 9257B piezoelectric dynamometer. The experimental equipment is shown in Fig. 3.
Fig. 3

Milling experimental equipment

The experimental parameters are shown in Table 1. The diameter and number of teeth of the cutter used in practical machining are respectively 200 mm and 10, and used in simulation milling experiments are respectively 100 mm and 6. During the milling experiments, cutting speed vc and feed per tooth fz are consistent with the actual cutting parameters. However, the feed speed of conventional milling machine in the laboratory cannot meet the requirements because of the high speed of heavy-duty milling. Thus, only two teeth are installed on the cutter for simulation experiment, which make the feed per tooth fz consistent with the actual processing conditions, and avoid feed speed exceeding the parameters of conventional milling machine.
Table 1

Milling experimental conditions

Cutting method

Heavy-duty milling

Simulation milling

Cutter diameter (mm)/number of teeth

200/10

100/2

Cutting speed vc (m/min)/spindle revolving speed n (r/min)

250/398

250/796

300/478

300/955

350/557

350/1115

Feed speed vf (m/min)/feed per tooth fz (mm/z) (vc= 300 m/min)

1/0.21

0.402/0.21

1.4/0.3

0.574/0.3

1.8/0.38

0.726/0.38

Axial cutting depth ap (mm)

2

2

Radial cutting depth ae (mm)

100

50

Cutter type

WIDIA M4000D200Z10ADJ

ZCCC FMR04-100-B32-RD16-06

Insert type

WIDIA RCMT1606M043M

WIDIA RDMT1605MOTX

2.2 Analysis of experimental results

When cutting speed vc = 300 m/min and axial cutting depth ap = 2 mm, the experimental values of the cutting force under different feeds are shown in Fig. 4.
Fig. 4

Influence of feed per tooth on main cutting force. Cutting speed vc = 300 m/min; Axial cutting depth ap = 2 mm

When feed per tooth is fz = 0.3 mm/z and axial cutting depth ap = 2 mm, the experimental values of the cutting force under different cutting speeds are shown in Fig. 5. The increase of feed per tooth leads to the increase of cutting area, so the cutting force is increasing. From the experimental value, it can get that the cutting force increased by about 29% when the feed per tooth is fz = 0.38 mm/z relative to fz = 0.21 mm/z. As the cutting speed increases, the cutting force decreases slightly. Through the analysis of experimental data, it can know that when the cutting speed vc = 350 m/min, the cutting force is 10% less than that of vc = 250 m/min.
Fig. 5

Influence of cutting speed on main cutting force. Feed per tooth fz = 0.3 mm/z; Axial cutting depth ap = 2 mm

3 Research on cutting state of insert during interrupted cutting

3.1 Determination of cutting-in and cutting-out type of insert

In the process of cutting in and cutting out the workpiece, the insert can be easily breakage because of the change and impact of cutting force and heat. Firstly, it is necessary to determine the cutting-in type of insert in the heavy-duty milling water chamber head. The radial cutting depth of the milling cutter is about 100 mm. The asymmetric milling method is adopted, as shown in Fig. 6a), cutting-in angle δ of cutter is close to 0°. By measuring the tool angle, side rake angle is γf= 4.88°, back rake angle is γp = 8.77°. Since the insert is round, the average cutting edge angle κr = arcsin (ap/2R)1/2 = 20.7° was adopted. And side rake angle γf> cutting-in angle δ = 3°. The discriminant of cutting-in type is Eq. (1):
$$\cot \kappa_{r} < \frac{{\tan \gamma_{p} }}{{\tan \gamma_{f} - \tan \delta }}$$
(1)
Fig. 6

Angles of cutting-in and cutting-out of the insert

According to the discriminant (1), it can be concluded that cutting-in type of insert is S type, as shown in Fig. 6b). The cutting-in point of insert is on the cutting edge. In the cutting-out process of interrupted cutting, the shear mechanism changes greatly and the shear direction is deflected. The cutting thickness of insert in the cutting-out location is gradually reduced because of asymmetric milling which causes cutting-out angle θ is less than 90°, as shown in Fig. 6c). Shear angle is deflected in the cutting-out process, and it can cause stress field change, cutting-out breakage and initiation and extension of cracks of insert. The shear angle deflection causes the load of rake face to be concentrated on cutting edge, which leads to instant increase of the stress of the cutting edge and the chance of the cutting edge breaking.

3.2 Simulation of stress-temperature distribution of insert

The two-dimensional simulation process of the interrupted cutting of water chamber head is shown in Fig. 7. The cutting parameters: vc = 300 m/min, fz = 0.3 mm/z, ap = 2 mm. Cutting-out angle is θ  = 30°. Rake angle of insert is γ0 = 10°, and relief angle is α0 = 7°. Insert basis material is P-type cemented carbide, and coating is TiAlN material.
Fig. 7

Two-dimensional simulation model of tool and workpiece

Combining with Figs. 8 and 9, the insert is cutting in the workpiece by the S type, and the stress is concentrated on the cutting edge, the cutting edge gradually contacts the workpiece. When the insert is cutting in the workpiece completely, the cutting force and the stress of cutting part of the insert reach the maximum. When the cutting state is stable, the cutting force decreased slightly and gradually stabilized. Cutting temperature of insert experiences gradual rise and maintains a smooth process. When the insert is cutting out the workpiece, cutting-out angle is very small. Although there is no negative shear phenomenon, the shear angle still has a deflection, and minimum shear angle is close to 0°. The insert-chip contact length becomes shorter, cutting force is focused on cutting edge, which is easy to cause cutting-out breakage of insert. The insert is subjected to cyclic loading during the interrupted cutting process, and the cutting force changed from 0 to about 1500 N.
Fig. 8

Stress distribution of insert during intermittent cutting process

Fig. 9

Change law of cutting force and temperature during intermittent cutting process

4 Establishment of dynamic cutting force model

According to the dynamic response characteristics of the cutting process [19], the spindle of the machine tool drives the insert cuts into the workpiece material. Shear and extrusion are formed in the main shear zone where has shear strain. The cutting force of insert can be calculated through shear stress in the main shear zone. In order to calculate the load on the insert, based on the force relationship in the orthogonal cutting theory [20], the geometric shape and the force situation of the tool are assumed: (1) the cutting edge of the insert is assumed to be a straight edge, regardless of the friction force in the third deformation zone; (2) the normal stress σs and shear stress τs in the shear plane are assumed to be fixed; (3) It is assumed that the force applied on the chip and tool contact area is a pair of equilibrium forces with the resultant force applied on the shear plane.

The relationship of cutting forces is shown in Fig. 10. The insert is subjected to the main cutting force Fc, feed direction cutting force Ff, and depth direction cutting force Fp.
Fig. 10

Composition of the cutting force

The cutting force mainly comes from shear stressτs in main shear area. Firstly, we can calculate shear force Fsh as follow:
$$F_{sh} = \tau_{s} A_{s} = \frac{{\tau_{s} A_{D} }}{\sin \phi }$$
(2)
where Fsh and τs are shear force and shear stress in the main shear zone; As is the area of the main shear area; AD is the area of the cutting area.
The main cutting force of insert is expressed as follows:
$$F_{c} = \frac{{\tau_{\text{s}} A_{D} \cos \left( {\beta - \gamma_{0} } \right)}}{{\sin \varphi \cos \left( {\varphi + \beta - \gamma_{0} } \right)}}$$
(3)
where β is the friction angle; γ0 is the rake angle; ϕ is the shear angle.
Round carbide insert is used for the heavy-duty milling process of the water chamber head. The cutting area of the insert is the irregular shape of the crescent, as shown in Fig. 11. The cutting thickness hD of the insert is constantly changing. An integral method is used to calculate the cutting area:
$$A_{D} = \int_{{\theta_{0} }}^{{\theta_{2} }} {d\theta } \int_{\rho }^{R} {rdr}$$
(4)
where R is the radius of circular insert.
Fig. 11

Cutting area of circular insert

Angles θ0, θ1 and θ2 in Fig. 11 can be expressed respectively by:
$$\left\{ \begin{array}{l} \theta_{0} = \arcsin \left[ {{{\left( {R - a_{p} } \right)} \mathord{\left/ {\vphantom {{\left( {R - a_{p} } \right)} R}} \right. \kern-0pt} R}} \right] \hfill \\ \theta_{1} = \arctan \left[ {{{\left( {R - a_{p} } \right)} \mathord{\left/ {\vphantom {{\left( {R - a_{p} } \right)} {\left( {\sqrt {R^{2} - \left( {R - a_{p} } \right)^{2} } - f_{z} } \right)}}} \right. \kern-0pt} {\left( {\sqrt {R^{2} - \left( {R - a_{p} } \right)^{2} } - f_{z} } \right)}}} \right] \hfill \\ \theta_{2} = \pi - \arccos \left( {{{f_{z} } \mathord{\left/ {\vphantom {{f_{z} } {2R}}} \right. \kern-0pt} {2R}}} \right) \hfill \\ \end{array} \right.$$
(5)
In the case of θ0 ≤ θ ≤ θ1, ρ = OB. In the case of θ1 ≤ θ ≤ θ2, ρ = OA. ρ can be expressed by:
$$\rho = \left\{ {\begin{array}{*{20}l} {\frac{{R - a_{p} }}{\sin \theta }} \hfill & {\theta < \theta_{1} } \hfill \\ {R - f_{z} \cos \theta } \hfill & {\theta \ge \theta_{1} } \hfill \\ \end{array} } \right.$$
(6)
Therefore, the cutting thickness equation is:
$$h_{D} = \left\{ {\begin{array}{*{20}l} {R - \frac{{R - a_{p} }}{\sin \theta }} \hfill & {\theta < \theta_{1} {\kern 1pt} } \hfill \\ {f_{z} \cos \theta } \hfill & {\theta \ge \theta_{1} } \hfill \\ \end{array} } \right.$$
(7)
The cutting area AD is divided into two parts by Angle θ1, so Eq. (4) can be expressed as:
$$A_{D} = \int_{{\theta_{0} }}^{{\theta_{1} }} {d\theta } \int_{{{h \mathord{\left/ {\vphantom {h {\sin \theta }}} \right. \kern-0pt} {\sin \theta }}}}^{R} {rdr} + \int_{{\theta_{1} }}^{{\theta_{2} }} {d\theta } \int_{{R - f_{z} \cos \theta }}^{R} {rdr}$$
(8)
where h is equal to R subtract ap.
The Eq. (8) can be calculated as:
$$\begin{aligned} A_{D} &= \frac{{R^{2} \left( {\theta_{1} - \theta_{0} } \right) + h^{2} \cot \left( {\theta_{1} - \theta_{0} } \right)}}{2} + Rf_{z} \sin \left( {\theta_{2} - \theta_{1} } \right) \\ & \quad - \,\frac{{f_{z}^{2} }}{8}\left[ {2\left( {\theta_{2} - \theta_{1} } \right) + \sin 2\left( {\theta_{2} - \theta_{1} } \right)} \right] \hfill \\ \end{aligned}$$
(9)
Tool cutting edge angle of circular insert is changing, and the range is 0°–90°. In the calculation process, the tool cutting edge angle is adopted as follow:
$$\kappa_{r} = \arcsin \sqrt {\frac{{a_{p} }}{2R}}$$
(10)
The AD in Eq. (9) is calculated based on feed per tooth fz. Substituting the above formula into Eq. (3), the cutting force of the cutting area AD can be calculated. Due to the asymmetric milling process of water chamber head, the cutting area of the insert is constantly changing with the rotation of the cutter, as shown in Fig. 12a). The cutting thickness is reduced to zero in the cutting-out workpiece, and the cutting trajectory of the cutter is similar to the cutting area figure of Fig. 11. When the position angle of cutter tooth is \(\theta_{0}^{\prime}\), the insert cuts in the workpiece by type S, and the cutting in point is shown in Fig. 12b). The equation of \(f_{Z}^{\prime}\) in cutting process is:
$$f_{z}^{\prime} = \left\{ {\begin{array}{*{20}l} {f_{z} \cos \theta^{\prime} } \hfill & {\theta^{\prime} \ge \theta_{1}^{\prime} } \hfill \\ {R_{c} - \frac{{R_{c} - a_{e} }}{{\sin \theta^{\prime} }}} \hfill & {\theta^{\prime} < \theta_{1}^{\prime} } \hfill \\ \end{array} } \right.$$
(11)
where Rc is cutter diameter; ae is radial cutting depth of cutter; \(\theta^{\prime}\) is position angle of cutter tooth. The Eq. (11) is substituted in Eq. (5), and the dynamic three angles are calculated respectively.
Fig. 12

Variation of cutting thickness of insert during milling

The position angle \(\theta_{0}^{\prime}\), \(\theta_{1}^{\prime}\) and \(\theta_{2}^{\prime}\) of cutter tooth in Fig. 12b) can be expressed by:
$$\left\{ \begin{array}{l} \theta_{0}^{\prime} = \arcsin \left[ {{{\left( {R_{c} - a_{e} } \right)} \mathord{\left/ {\vphantom {{\left( {R_{c} - a_{e} } \right)} {R_{c} }}} \right. \kern-0pt} {R_{c} }}} \right] \hfill \\ \theta_{1}^{\prime} = \arctan \left[ {{{\left( {R_{c} - a_{e} } \right)} \mathord{\left/ {\vphantom {{\left( {R_{c} - a_{e} } \right)} {\left( {\sqrt {R_{c}^{2} - \left( {R_{c} - a_{e} } \right)^{2} } - f_{z} } \right)}}} \right. \kern-0pt} {\left( {\sqrt {R_{c}^{2} - \left( {R_{c} - a_{e} } \right)^{2} } - f_{z} } \right)}}} \right] \hfill \\ \theta_{2}^{\prime} = \pi - \arccos \left( {{{f_{z} } \mathord{\left/ {\vphantom {{f_{z} } {2R_{c} }}} \right. \kern-0pt} {2R_{c} }}} \right) \hfill \\ \end{array} \right.$$
(12)
Thus, in the milling process, the dynamic cutting thickness \(h_{D}^{\prime}\) can be expressed as:
$$h_{D}^{\prime} = \left\{ {\begin{array}{*{20}l} {R - \frac{{R - a_{p} }}{\sin \theta }} \hfill & {\theta < \theta_{1} } \hfill \\ {f_{z}^{\prime} \cos \theta } \hfill & {\theta \ge \theta_{1} } \hfill \\ \end{array} } \right.$$
(13)
Replace fz with \(f_{z}^{\prime}\) in Eqs. (5) and (9), the calculation formula of the instantaneous cutting area of the insert is obtained:
$$\begin{aligned} A_{D}^{\prime} & = \frac{{R^{2} \left( {\theta_{1} - \theta_{0} } \right) + h^{2} \cot \left( {\theta_{1} - \theta_{0} } \right)}}{2} + Rf_{z}^{\prime} \sin \left( {\theta_{2} - \theta_{1} } \right) \\ & \quad - \frac{{f_{z}^{'2} }}{8}\left[ {2\left( {\theta_{2} - \theta_{1} } \right) + \sin 2\left( {\theta_{2} - \theta_{1} } \right)} \right] \\ \end{aligned}$$
(14)
Therefore, using the parameters of Table 2, the dynamic main cutting force of the circular inert in milling process is calculated according to Eqs. (3) and (14), as shown in Fig. 13. When the position angle of cutter tooth is \(\theta_{1}^{\prime}\), the cutting force reaches the maximum, and then decreases gradually. When the insert is cutting out, the cutting force is zero.
Table 2

Cutting conditions and model parameters

Physical quantity

Value

Physical quantity

Value

fz (mm/z)

0.21

0.3

0.38

R (mm)

8

θ1 (deg)

49.7

50.3

50.7

τs (MPa)

498

β (deg)

44.6

38.9

29.4

ap (mm)

2

ϕ (deg)

27.7

30.5

35.3

θ0 (deg)

48.6

Fig. 13

Dynamic main cutting force during cutting in and cutting out workpiece. vc= 300 m/min; ap= 2 mm

5 Conclusions

Through the simulated heavy-duty milling experiments, cutting simulation and establishment of dynamic cutting force model, the mechanical load characteristics of damage and failure of carbide insert were studied. The conclusions are as follows:
  1. 1.

    The cutting speed was 300 m/min, feed rate of each tooth was 0.3 mm, and axial cutting depth was 2 mm during heavy-duty milling of water chamber head. The maximum main cutting force reaches 1050 N in the milling process. The cutting force increased with the increase of feed rate of each tooth. The increase of cutting speed had little effect on the cutting force.

     
  2. 2.

    When the insert was cutting into workpiece, main cutting edge was the first contact with the workpiece, and the stress was concentrated on the cutting edge. In the process of cutting out, the shear angle was deflected and decreased, and the stresses gradually converged to the cutting edge. The above conditions were provided for insert breakage.

     
  3. 3.

    The calculation method of irregular cutting area of circular insert was presented during asymmetric milling with the goal of establishing mathematical model of dynamic cutting force of circular insert in asymmetric milling process. The dynamic cutting forces were calculated by using different position angles of cutter teeth. The model was verified by experiment value. The calculated value of the model can be used to represent the change of cutting force during milling process.

     

Notes

Funding

This research was financially supported by National Natural Science Foundation of China (No. 51675145).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no competing interests.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.The Key Laboratory of National and Local United Engineering for “High-Efficiency Cutting & Tools”Harbin University of Science and TechnologyHarbinPeople’s Republic of China
  2. 2.School of Mechanical EngineeringTianjin University of TechnologyTianjinPeople’s Republic of China

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