Fibonacci symmetry structure induction heating coil for quenching of giant gear

Abstract

The application discloses a giant gear quenching induction heating coil with a Fibonacci symmetry structure, which comprises a dense area, a transition area and a sparse area, the dense area is arranged in the middle of the induction heating coil, and the two ends of the dense area are connected with the sparse area through the transition area; the transition area and the sparse area are symmetrically distributed along the tangential direction of the edge of the gear to be quenched with respect to the dense area; the dense area, the transition area and the sparse area all comprise multiple turns of coils, adjacent two turns of coils are connected through a semicircular arc segment, each turn of coil comprises a coil outer edge and a straight line segment which are connected, and the straight line segments of adjacent two turns of coils are connected through the semicircular arc segment to form a tooth end surface heating segment located at the upper and lower surfaces of the outer edge of the gear; the length of the dense interval area arranged in the dense area, the length of the transition interval area arranged in the transition area and the length of the sparse interval area arranged in the sparse area are arranged in a Fibonacci sequence. The application can solve the problem of the local material hardening strength reduction of the traditional induction heating coil when the giant gear is quenched and inductively heated.

Description

Technical Field

[0001] This invention belongs to the technical field of workpiece induction heating devices, and specifically relates to a Fibonacci symmetric structure induction heating coil for quenching giant gears. Background Technology

[0002] In existing technologies, finished metal workpieces require quenching heat treatment to alter the metal phase transformation structure on the workpiece surface, thereby increasing the surface hardening strength. Induction heating technology is commonly used to improve heat treatment efficiency. In gear manufacturing, induction coil heating quenching is generally employed to improve tooth surface hardness. However, due to the large diameter of giant gears, using a fully enclosed induction coil for heating is too costly. Furthermore, in the past, when induction heating quenching was used on giant gears, the hardness of the material at the junction of the starting and ending heating ends was often significantly reduced compared to other parts of the gear after quenching. Summary of the Invention

[0003] This invention provides a Fibonacci symmetric structure induction heating coil for quenching giant gears, which solves the problem of local material hardening strength reduction when traditional induction heating coils are used for quenching giant gears, thereby making the metal phase of the gear more uniform after quenching by this invention.

[0004] The objective of this invention and the technical problem it solves are achieved by the following technical solution. The Fibonacci symmetric structure induction heating coil for quenching giant gears proposed in this invention includes a dense region, a transition region, and a loose region. The loose region is located at both ends of the induction heating coil, and the dense region is located in the middle of the induction heating coil. The two ends of the dense region are respectively connected to the corresponding loose region through a transition region. The induction heating coil is arc-shaped, and the center of the corresponding circle of the induction heating coil is concentric with the center of the gear to be quenched. The transition region and the loose region are symmetrically distributed tangentially along the edge of the gear to be quenched about the dense region. Each of the dense region, transition region, and loose region includes multiple turns of coil. Adjacent turns of coil are connected by a semi-circular arc segment. Each turn of coil includes a connected outer edge and a straight segment. The outer edge of the coil is along the edge of the gear to be quenched. Extending in the thickness direction, the straight segments of two adjacent coil turns are connected by a semi-circular arc segment to form a tooth end face heating section located on the upper and lower surfaces of the outer edge of the gear. The adjacent tooth end face heating sections are staggered relative to the gear. The dense zone includes several dense interval zones, and a dense interval zone is formed between two adjacent coil turns in the dense zone. The transition zone includes several transition interval zones, and a transition interval zone is formed between two adjacent coil turns in the transition zone. The loose zone includes several loose interval zones, and a loose interval zone is formed between two adjacent coil turns in the loose zone. Along the tangent direction of the outer edge of the gear to be quenched, the lengths of the dense interval zone, the transition interval zone, and the loose interval zone are arranged in a Fibonacci sequence.

[0005] Furthermore, the two straight segments in the tooth end face heating section are distributed parallel to each other, so that the tooth end face heating section is U-shaped.

[0006] Furthermore, the outer edge of the coil located outside one loose region has a positive terminal, and the outer edge of the coil located outside another loose region has a negative terminal.

[0007] Furthermore, the dense zone includes five dense interval zones, the transition zone includes five transition interval zones, and the loose zone includes five loose interval zones.

[0008] Furthermore, the length of the densely spaced region is 4d, the length of the transitional spaced region is 7d, and the length of the sparsely spaced region is 11d, where d is the diameter of the induction heating coil wire.

[0009] Furthermore, let the edge thickness of the gear to be quenched be h1, the distance from the outer edge of the coil to the upper and lower surfaces of the outer edge of the gear to be quenched be h2, and the height of the outer edge of the coil be h3. Then we have h3 = h1 + 2h2, where h2 = 1.5d, and d is the diameter of the induction heating coil wire.

[0010] Furthermore, let R2 be the addendum circle radius of the gear to be quenched, R1 be the dedendum circle radius of the gear to be quenched, and h be the total tooth height, then we have h = R2 - R1.

[0011] The included angle between two adjacent turns of the coil in the dense region and the center of the gear is: θ1=4d / (R2+1.5d);

[0012] The angle between two adjacent turns of the coil relative to the gear center in the transition zone is: θ2=7d / (R2+1.5d);

[0013] The included angle between two adjacent turns of the coil in the loose zone and the center of the gear is: θ3=11d / (R2+1.5d).

[0014] Furthermore, let the length of the straight line segment be h4, then h4 = h + 1.5d; the radius of curvature of the semicircular arc segment in the dense region is h7 = 2d; the radius of curvature of the semicircular arc segment in the transition region is h6 = 3.5d; and the radius of curvature of the semicircular arc segment in the loose region is h5 = 5.5d.

[0015] By employing the above technical solution, the beneficial effects of the present invention are:

[0016] The induction heating coil proposed in this invention employs a symmetrical, variable-pitch, multi-turn induction heating coil for quenching induction heating of a giant gear. This improves the abrupt phase transformation characteristics of the metal at the connection between the beginning and end of the induction heating process, resulting in a more uniform metal phase transformation and hardening distribution throughout the gear after induction heating quenching. During the induction heating process, the giant gear can slowly rotate along its central axis, allowing the gear entering the induction heating coil to gradually heat up and the temperature to drop gently when leaving the coil, avoiding the effects of sudden temperature changes and ensuring sufficient phase transformation of the metal at the teeth and roots of the giant gear. Furthermore, this invention provides tooth end-face heating sections at the upper and lower end faces of the teeth, thereby achieving more comprehensive and uniform heating of the teeth and their root regions.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a three-dimensional perspective structural diagram of the Fibonacci symmetric structure induction heating coil for quenching giant gears of the present invention, when it is coupled with the gear to be quenched.

[0019] Figure 2 This is a partially enlarged view of the relative position of the present invention when it is engaged with the gear to be quenched.

[0020] Figure 3 This is a schematic diagram of the structure of the Fibonacci symmetric structure induction heating coil for quenching giant gears according to the present invention.

[0021] Figure 4 This is a front view of the induction heating coil (partial) of the present invention unfolded along the tangent direction of the outer edge of the gear to be quenched.

[0022] Figure 5 This is a horizontal cross-sectional profile of the gear to be quenched and the induction heating coil of this invention.

[0023] Figure 6 This is a top-view planar structural diagram of the present invention when it is used with the gear to be quenched.

[0024] Figure 7 yes Figure 6 The diagram shows a detailed partial structure in the top-view plan view. Detailed Implementation

[0025] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments.

[0026] Implementation of a Fibonacci symmetric structure induction heating coil for quenching giant gears, for example Figures 1 to 7 As shown, the induction heating coil 100 includes a dense region 1, a transition region 2, and a loose region 3. The loose region 3 is located at both ends of the induction heating coil, and the dense region 1 is located in the middle of the induction heating coil. The two ends of the dense region 1 are respectively connected to the corresponding loose region 3 through a transition region 2. The induction heating coil is arc-shaped, and the center of the arc-shaped induction heating coil is concentric with the center of the gear to be quenched. The gear to be quenched 4 includes a gear body 41 and teeth 42 circumferentially distributed on the outer edge of the gear body. The part where the teeth connect with the gear body is the tooth root 43. Therefore, the structural feature of the induction heating coil disclosed in this invention is that the dense region is located in the middle, and a transition region and a loose region are provided on both sides of the dense region. The transition region and the loose region are symmetrically distributed along the tangential direction of the gear edge about the dense region, and the coil dense region itself is also symmetrical about the center line of the entire induction heating coil along the tangential direction of the gear edge.

[0027] The dense, transitional, and loose zones all include multi-turn coils. Adjacent coil turns are connected by a semi-circular arc segment 5. Each coil turn includes a connected outer edge 6 and a straight segment 7. The outer edge 6 extends along the gear thickness direction, and the straight segment 7 is placed parallel to the upper and lower surfaces of the gear's outer edge. The straight segments 7 of adjacent coil turns are connected by the semi-circular arc segment 5 to form a tooth end face heating section 8 located on the upper and lower surfaces of the gear's outer edge. Adjacent tooth end face heating sections 8 are connected by the outer edge 6 of the coil. The tooth end face heating section is used to heat the upper and lower surfaces of the teeth (including the tooth root), so that the tooth area is wrapped by the induction heating coil, and the teeth are heated more evenly. This results in a more uniform change in the metal phase and a more uniform hardening distribution after quenching. In this embodiment, the tooth end face heating section 8 is U-shaped, and adjacent tooth end face heating sections are staggered relative to the gear. The two straight segments 7 in each tooth end face heating section are parallel to each other.

[0028] The outer edge of the coil located outside one loose region has a positive terminal 9, and the outer edge of the coil located outside another loose region has a negative terminal 10; when the present invention is in operation, the positive terminal and the negative terminal are connected to the corresponding power supply guide.

[0029] Combination Figure 4The dense zone 1 comprises five identical densely spaced zones 11, the transition zone 2 comprises five identical transitional zones 21, and the loose zone 3 comprises five identical loosely spaced zones 31; that is, the spacing between two adjacent coil turns in the dense zone is equal, the spacing between two adjacent coil turns in the transition zone is equal, and the spacing between two adjacent coil turns in the loose zone is equal. In this embodiment, along the tangent direction of the outer edge of the gear to be quenched, the length of the densely spaced zone is 4d, the length of the transitional zone is 7d, and the length of the loosely spaced zone is 11d, where d is the diameter of the induction heating coil wire. Therefore, the lengths of the densely spaced zone, the transitional zone, and the loosely spaced zone are arranged in a Fibonacci sequence, making the coil density distribution of the induction heating coil more reasonable, which is beneficial for achieving a gradual and gentle heating or cooling process during gear quenching. In other embodiments, the length of the densely spaced zone is 3d, the length of the transitional zone is 5d, and the length of the loosely spaced zone is 8d, which can also be arranged in a Fibonacci sequence, so this invention does not limit this.

[0030] In this embodiment, let the edge thickness of the gear to be quenched be h1, the distance from the outer edge of the coil to the upper and lower surfaces of the outer edge of the gear to be quenched be h2, and the height of the outer edge of the coil be h3. Then, h3 = h1 + 2h2, where h2 = 1.5d.

[0031] Combination Figure 5 Where R2 is the addendum circle radius of the gear to be quenched, R1 is the root circle radius of the gear to be quenched, and h is the total tooth height, then h = R2 - R1.

[0032] The angle between two adjacent coils in the dense zone and the center of the gear (i.e., the arc of the center of the gear to be quenched corresponding to the length of each dense interval zone) is: θ1=4d / (R2+1.5d);

[0033] The angle between two adjacent turns of the coil in the transition zone and the center of the gear (i.e., the arc of the center of the gear to be quenched corresponding to the length of each transition interval zone) is: θ2=7d / (R2+1.5d);

[0034] The angle between two adjacent coils in the loose zone and the center of the gear (i.e., the arc of the center of the gear to be quenched corresponding to the length of each loose interval zone) is: θ3=11d / (R2+1.5d).

[0035] Combination Figure 6 , Figure 7 Each coil extends radially into the upper and lower surfaces of the gear's outer edge to form the aforementioned tooth end face heating section. This section consists of a straight line segment and a semi-circular arc segment. Let the length of the straight line segment be h4, then h4 = h + 1.5d. The radius of curvature of the semi-circular arc segment in the dense region is h7 = 2d; the radius of curvature of the semi-circular arc segment in the transition region is h6 = 3.5d; and the radius of curvature of the semi-circular arc segment in the loose region is h5 = 5.5d.

[0036] The induction heating coil proposed in this invention employs a symmetrical variable-pitch multi-turn induction heating coil to perform quenching induction heating on a giant gear. This improves the abrupt change characteristics of metal phase transformation at the connection between the beginning and end of the induction heating process, resulting in uniform metal phase transformation and hardening distribution throughout the gear after induction heating quenching. During the induction heating process, the giant gear can slowly rotate along its central axis (the central axis is installed in the central axis hole 44 opened on the gear body). The rotation direction can be either forward or reverse, allowing the gear entering the induction heating coil to gradually heat up by passing through the loose zone, transition zone, and dense zone in sequence. After being heated by induction heating, the gear gradually leaves the induction heating coil by passing through the dense zone, transition zone, and loose zone, slowing down the rate of temperature drop and avoiding the effects of sudden temperature changes. This ensures that the metal at the teeth and roots of the giant gear undergoes sufficient phase transformation.

[0037] The above description is merely a preferred embodiment of the present invention, and all aspects not detailed herein are existing technologies. Any simple modifications, equivalent changes, and alterations made by those skilled in the art to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An induction heating coil for quenching of a giant gear with a Fibonacci symmetry structure, characterized in that: The induction heating coil comprises a dense area, an excessive area and a loose area, the loose area is arranged at both ends of the induction heating coil, the dense area is arranged in the middle of the induction heating coil, and both ends of the dense area are connected with corresponding loose areas through an excessive area; the induction heating coil is in an arc shape, a center of the induction heating coil is concentrically arranged with a center of the gear to be hardened, and the excessive area and the loose area are symmetrically distributed along the tangential direction of the edge of the gear to be hardened with respect to the dense area; the dense area, the excessive area and the loose area all comprise multiple turns of coils, adjacent two turns of coils are connected through a semicircular arc segment, each turn of coil comprises a coil outer edge and a straight segment which are connected, the coil outer edge extends along the thickness direction of the gear to be hardened, and the straight segments of adjacent two turns of coils are connected through a semicircular arc segment to form a gear tooth end face heating segment located at the upper and lower surfaces of the gear edge; and adjacent gear tooth end face heating segments are staggered and distributed above and below the gear. The dense area comprises a plurality of dense interval areas, and one dense interval area is formed between adjacent two turns of coils in the dense area; the excessive area comprises a plurality of excessive interval areas, and one excessive interval area is formed between adjacent two turns of coils in the excessive area; and the loose area comprises a plurality of loose interval areas, and one loose interval area is formed between adjacent two turns of coils in the loose area; along the tangential direction of the gear edge to be hardened, the length of the dense interval area, the length of the excessive interval area and the length of the loose interval area are arranged in a Fibonacci sequence.

2. The Fibonacci symmetry structure induction heating coil for quenching of a giant gear according to claim 1, characterized in that: The two straight segments in the gear tooth end face heating segment are parallel to each other, so that the gear tooth end face heating segment is in a U shape.

3. The Fibonacci symmetry structure induction heating coil for quenching of a giant gear according to claim 1, characterized in that: The coil outer edge located outside one loose area has a positive electrode connecting end, and the coil outer edge located outside the other loose area has a negative electrode connecting end.

4. The Fibonacci symmetry structure induction heating coil for quenching of a giant gear according to claim 1, characterized in that: The dense area comprises five dense interval areas, the excessive area comprises five excessive interval areas, and the loose area comprises five loose interval areas.

5. The Fibonacci symmetry structure induction heating coil for quenching of a giant gear according to claim 4, characterized in that: The length of the dense interval area is 4d, the length of the excessive interval area is 7d, and the length of the loose interval area is 11d, wherein d is the diameter of the wire of the induction heating coil.

6. The Fibonacci symmetry structure induction heating coil for quenching of a giant gear according to claim 5, characterized in that: Supposing that the edge thickness of the gear to be hardened is h1, the distance between the end of the coil outer edge and the upper and lower surfaces of the gear edge to be hardened is h2, and the height of the coil outer edge is h3, there is h3=h1+2h2, wherein h2=1.5d, wherein d is the diameter of the wire of the induction heating coil.

7. The Fibonacci-symmetric induction heating coil for quenching of a giant gear according to claim 6, characterized in that: Supposing that R2 is the dedendum circle radius of the gear to be hardened, R1 is the addendum circle radius of the gear to be hardened, and h is the total height of the gear tooth, there is h=R2-R1; The included angle of the adjacent two turns of coils in the dense area with respect to the center of the gear is θ1=4d / (R2+1.5d); The included angle of the adjacent two turns of coils in the excessive area with respect to the center of the gear is θ2=7d / (R2+1.5d); The included angle of the adjacent two turns of coils in the loose area with respect to the center of the gear is θ3=11d / (R2+1.5d).

8. The Fibonacci symmetry structure induction heating coil for quenching of a giant gear according to claim 7, characterized in that: Supposing that the length of the straight segment is h4, there is h4=h+1.5d; the curvature radius of the semicircular arc segment of the dense area is h7=2d; the curvature radius of the semicircular arc segment of the excessive area is h6=3.5d; and the curvature radius of the semicircular arc segment of the loose area is h5=5.5d.

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