Medium-frequency quenching inductor and quenching device for machining automobile half-axle spline

Abstract

The invention relates to a medium-frequency quenching inductor and a quenching device for automobile half shaft spline machining. The inductor is characterized in that a copper conductor is arranged in an effective ring; the copper conductor comprises at least one circle of spiral shape; when the target half shaft is put into the effective coil, the copper conductor heats the target half shaft through electromagnetic induction; quenching water is input into the quenching water component; after the target half shaft is heated, the quenching water component sprays quenching water to the target half shaft for quenching; the cooling water part comprises 2N cooling water pipes and 2N one-inlet-two water dividers, each cooling water pipe is wound around the copper conductor, and the spiral directions of the adjacent cooling water pipes are opposite; and the cooling water pipe inputs cooling water through the one-water-inlet two-water-outlet device, and when the effective ring heats the target half shaft, the cooling water pipe is used for cooling the copper conductor. The intermediate frequency quenching inductor solves the technical problems that when an existing intermediate frequency quenching inductor is used for machining an automobile half shaft spline, heating and quenching are not uniform, and a copper conductor is prone to being damaged by high temperature.

Description

Technical Field

[0001] This application relates to the field of automotive half-shaft heat treatment technology, specifically to a medium-frequency quenching inductor and quenching device for machining splines on automotive half-shafts. Background Technology

[0002] A medium-frequency quenching inductor is a device that uses the principle of electromagnetic induction to convert medium-frequency alternating current into heat energy for surface quenching of metal workpieces. Its working principle is as follows: When medium-frequency alternating current is applied to the inductor, an alternating magnetic field is generated. The metal workpiece placed in this magnetic field experiences induced currents (eddy currents) of the same frequency on its surface due to electromagnetic induction. Due to the skin effect, the eddy currents are unevenly distributed across the workpiece cross-section, with a high current density at the surface and a low current density at the center. Because the workpiece itself has resistance, according to the Joule-Lenz law, the eddy currents concentrated on the workpiece surface generate resistive heat, rapidly heating the surface to the quenching temperature while the core temperature remains essentially unchanged. Once the workpiece surface reaches the quenching temperature, a quenching medium, such as quenching water or alloy oil, is sprayed through quenching water holes, rapidly cooling the workpiece surface and achieving quenching hardening to obtain the desired hardness, strength, and wear resistance.

[0003] An inductor typically consists of an effective coil with a copper wire enclosed in an insulating medium, a cooling system, and an encapsulation layer. When the inductor is energized, current flows through the effective coil, generating a magnetic field that heats the workpiece to the desired temperature. Simultaneously, cooling water flowing within the inductor carries heat away and maintains it within the permissible operating temperature range.

[0004] In current medium-frequency quenching inductors, when heating workpieces, the effective coil's temperature also becomes very high due to the workpiece being heated to a very high temperature and the close proximity of the workpiece to the effective coil. Since the effective coil is typically made of copper conductor, on the one hand, excessively high temperature will increase the conductor resistance of the effective coil, thereby reducing the heating power and affecting the magnetic induction heating efficiency; on the other hand, high effective coil temperature will also affect its service life. Summary of the Invention

[0005] This application solves the technical problems of uneven heating and quenching and easy damage to copper conductors due to high temperature in the existing medium-frequency quenching inductors when machining splines on automobile half shafts by means of structural design such as effective spiral copper conductor coil, optimized quenching water and cooling water components, and ring-shaped encapsulation part.

[0006] This application provides an embodiment of a medium-frequency quenching inductor for machining splines on automotive half-shafts, used for medium-frequency quenching of the head of a target half-shaft. The medium-frequency quenching inductor for machining splines on automotive half-shafts includes: An effective loop is provided, wherein a copper conductor is disposed within the effective loop; the copper conductor is a spiral shape comprising at least one turn; when the target half-shaft is placed in the effective loop and a changing current is input to the copper conductor, the copper conductor heats the target half-shaft through electromagnetic induction; Quenching water component, wherein quenching water is supplied; after the target half-shaft is heated, the quenching water component is used to spray quenching water onto the target half-shaft for quenching. The cooling water component includes 2N cooling water pipes and 2N one-inlet-two-distributor water inlets, where N is a positive integer. Each cooling water pipe is wound around the copper conductor, and adjacent cooling water pipes have opposite spiral directions. Cooling water is input into the cooling water pipes through the one-inlet-two-distributor water inlets. When the effective coil heats the target half-shaft, the cooling water pipes are used to cool the copper conductor. The one-inlet-two-distributor water inlets are rectangular injection molded parts and are also used to fix the cooling water pipes.

[0007] In the aforementioned medium-frequency quenching inductor for machining splines on automotive half-shafts, as a preferred embodiment, the medium-frequency quenching inductor further includes: The encapsulation part fills the gap and the outside of the effective ring and the cooling water component, and the overall shape of the encapsulation part is annular.

[0008] In the aforementioned medium-frequency quenching inductor for machining splines on automotive half-shafts, as a preferred embodiment, the encapsulation part is refractory putty, vermiculite putty, or ceramic fiber putty.

[0009] In the aforementioned medium-frequency quenching inductor for machining splines on automotive half-shafts, as a preferred embodiment, the medium-frequency quenching inductor further includes: The base plate has a side plate and an inlet slot fixedly installed on its side. The inlet wire of the copper conductor is fixed through the end face of the side plate and the inlet slot in sequence. A terminal post is provided at the end of the inlet wire of the copper conductor.

[0010] In the above-mentioned medium-frequency quenching inductor for machining splines on automotive half-shafts, as a preferred embodiment, there are two base plates, two wire inlet slots, and two side plates, and the copper conductor has two wires. The two base plates, two wire inlet slots, and two side plates are respectively connected to the two wires. The two side plates are arranged opposite each other, and a clamp is provided between the two side plates. The clamp is fixedly connected to both side plates.

[0011] In the aforementioned medium-frequency quenching inductor for machining splines on automotive half-shafts, as a preferred embodiment, the medium-frequency quenching inductor further includes: A rear support plate is vertically fixed, and both the quenching water component and the cooling water component are installed on the rear support plate. The rear support plate has a central hole for accommodating the target half-shaft; the quenching water component, the effective ring, and the cooling water component are all coaxially arranged with the central hole.

[0012] In the aforementioned medium-frequency quenching inductor for machining splines on automotive half-shafts, as a preferred embodiment, the quenching water component includes a quenching water component body, at least one first quenching water inlet, and at least one second quenching water inlet, wherein the quenching water component body has a hollow annular structure. The inner side of the quenching water component body is inclined to face the effective ring, and a plurality of quenching water holes are provided on the inner side of the quenching water component body; at least one first quenching water inlet or at least one second quenching water inlet, the quenching water component sprays quenching water onto the target half-shaft at the center of the effective ring through the quenching water holes to quench the target half-shaft.

[0013] In the aforementioned medium-frequency quenching inductor for machining splines on automotive half-shafts, as a preferred embodiment, the cooling water component further includes N cooling water inlets, N cooling water outlets, 2N inlet pipes, and 2N outlet pipes. The cooling water pipes are spiral-shaped and all wound around the copper conductor. The two ends of the cooling water pipes are respectively provided with inlet pipes and outlet pipes. Two adjacent inlet pipes are connected to the cooling water inlet through a one-inlet-two-outlet water distributor, and two adjacent outlet pipes are connected to the cooling water outlet through a one-inlet-two-outlet water distributor.

[0014] In the aforementioned medium-frequency quenching inductor for machining splines on automotive half-shafts, as a preferred embodiment, the cooling water component includes four cooling water pipes and four one-inlet-two-distributor water separators, with the four cooling water pipes distributed on the circumference of the copper conductor; the spiral directions of adjacent cooling water pipes are opposite. There are two cooling water inlets and two cooling water outlets. The two cooling water inlets are connected to four inlet pipes through two one-inlet-two-outlet water distributors. The two cooling water outlets are connected to four outlet pipes through two one-inlet-two-outlet water distributors.

[0015] This application also provides a quenching device for machining splines on automotive half-shafts. The quenching device includes a medium-frequency quenching inductor for machining splines on automotive half-shafts as described above, and also includes an actuator for moving the head of the target half-shaft into the effective circle of the medium-frequency quenching inductor.

[0016] According to the above embodiments, the medium-frequency quenching inductor and quenching device for machining splines on automotive half-shafts, through the effective coil of the spiral-shaped copper conductor in this application, can generate a strong and uniform alternating magnetic field, enabling the target half-shaft to be heated quickly and uniformly, significantly improving the heating quality and efficiency of the half-shaft spline before quenching; through the quenching water component with a hollow ring structure and multi-angle quenching water hole design in this application, uniform and rapid cooling can be achieved after the half-shaft is heated, effectively avoiding local temperature unevenness and ensuring the consistency and stability of the quenching effect; through the cooling water component composed of multiple spirally wound cooling water pipes in this application, the heat of the copper conductor can be removed in time, reducing its operating temperature, reducing the increase in resistance and energy consumption, avoiding damage due to high temperature, and greatly extending the service life of the effective coil and the reliability of the equipment. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall structure of the medium-frequency quenching inductor for machining splines on automotive half-shafts provided in this application embodiment (I); Figure 2 A schematic diagram (II) of the overall structure of the medium-frequency quenching inductor for machining splines on automotive half-shafts provided in this application embodiment; Figure 3 A schematic diagram of the overall structure of the effective coil of the medium-frequency quenching inductor for machining splines on automotive half-shafts provided in this application embodiment; Figure 4 A schematic diagram of the overall structure inside the effective coil of a medium-frequency quenching inductor for machining splines on an automotive half-shaft, provided as an embodiment of this application; Figure 5 A schematic diagram of the overall structure of the medium-frequency quenching inductor water distributor for automobile half-shaft spline machining provided in this application embodiment (I). Figure 6 A schematic diagram of the overall structure of the medium-frequency quenching inductor distributor for machining splines of automotive half-shafts provided in this application embodiment (II). Figure 7 A schematic diagram of the overall structure of the medium-frequency quenching inductor water distributor for automobile half-shaft spline machining provided in this application embodiment (III). Figure 8 A schematic diagram of the overall structure of the medium-frequency quenching inductor water distributor for automobile half-shaft spline machining provided in this application embodiment (IV). Figure 9 A schematic diagram (V) of the overall structure of the medium-frequency quenching inductor distributor for machining splines on automotive half-shafts provided in this application embodiment.

[0018] In the picture: 101. Base plate; 102. Side plate; 103. Clamping plate; 104. Mounting holes; 201. Rear support plate; 202. Fastener; 203. Center hole; 301. Quenching water component body; 302. Quenching water hole; 303. First quenching water inlet; 304. Second quenching water inlet; 401. Inlet cable; 402. Inlet cable tray; 403. Terminal block; 404. Copper conductor; 5. Cooling water components; 501. Cooling water inlet; 502. Cooling water outlet; 503. One-inlet / two-outlet water distributor; 5031. Upper injection molded body; 5032. Lower injection molded body; 504. Inlet water pipe; 505. Outlet water pipe; 506. Cooling water pipe; 507. Sealing cavity; 508. Pipe end; 509. Nut-shaped sleeve; 5091. Sleeve inner hole; 5092. Hexagonal nut square head; 5093. Sleeve external thread; 509 4. Contraction joint; 510. Threaded section; 511. Guide tube fixing clip; 5110. Triangular clip; 5111. Large end; 5112. Small end; 5113. Sealing clip; 5114. Front section of fork arm; 5115. Barbed protrusion; 5116. Rear section of fork arm; 5117. U-shaped groove; 5118. Inwardly tapered chamfered surface; 5119. Triangular groove; 512. Guide tube fixing groove; 513. First inner hole; 514. Second inner hole; 6. Packaging Department. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0020] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0021] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0022] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 This application solves the technical problems of uneven heating and quenching and easy damage of copper conductor 404 due to high temperature in existing medium-frequency quenching inductors when machining splines of automobile half shafts by means of the effective coil of spiral copper conductor 404, optimized quenching water and cooling water components 5, and annular encapsulation part 6. The embodiments of this application provide a medium-frequency quenching inductor for machining splines of automobile half shafts, which is used to perform medium-frequency quenching on the head of the target half shaft. The medium-frequency quenching inductor for machining splines of automobile half shafts includes an effective coil, a quenching water component and a cooling water component 5, which are analyzed in detail below.

[0023] An effective loop is provided, which includes a copper conductor 404. The copper conductor 404 is a spiral with at least one turn. When the target half-shaft is placed in the effective loop and a changing current is input to the copper conductor 404, the copper conductor 404 heats the target half-shaft through electromagnetic induction.

[0024] A quenching water component is supplied with quenching water; after the target half-shaft is heated, the quenching water component is used to spray quenching water onto the target half-shaft for quenching.

[0025] The cooling water component 5 includes 2N cooling water pipes 506 and 2N one-inlet-two-distributor water separators 503, where N is a positive integer. Each cooling water pipe 506 is wound around the copper conductor 404, and adjacent cooling water pipes 506 have opposite spiral directions. Cooling water is input into the cooling water pipes 506 through the one-inlet-two-distributor water separators 503. When the effective coil heats the target half-shaft, the cooling water pipes 506 are used to cool the copper conductor 404. The one-inlet-two-distributor water separators 503 are cuboid injection molded parts and are also used to fix the cooling water pipes 506.

[0026] The copper conductor 404, employing at least one effective coil with a spiral design as described in this application, forms a tightly encircling alternating magnetic field region. When a medium-frequency variable current is applied, the magnetic field generated by the spiral copper conductor 404 exhibits high concentration and symmetry, enabling precise application to the spline region at the head of the target half-shaft. Based on the principle of electromagnetic induction, this magnetic field distribution induces uniform eddy currents on the half-shaft surface, utilizing the skin effect to concentrate heat on the spline surface (heating depth is controllable). Compared to traditional linear conductors, the spiral structure increases the magnetic field strength by 20%-30%, accelerates the half-shaft heating speed by more than 15%, and shortens the heating time to 80% of traditional processes; the eddy current distribution uniformity error is <5%, avoiding material degradation caused by localized overheating and ensuring uniform hardness of the spline surface (hardness deviation ≤ ±3HRC), providing an ideal temperature basis for subsequent quenching.

[0027] The quenching water component body 301 of this application has a hollow annular structure, with its inner surface inclined at an angle of 30°-45° towards the center of the effective ring, and quenching water holes 302 with a diameter of 0.8-1.2 mm (hole spacing 5-8 mm) are evenly distributed. Quenching water is input through independent first and second quenching water inlets 304, forming a stable water pressure (0.3-0.8 MPa) in the annular cavity, and impacting the surface of the half-shaft at a jet angle of 30-50° through the inclined channels. The inclined spray design allows the quenching water to cover an angle of 270°-360°, avoiding the cooling blind spots caused by traditional single-sided water spraying, and improving the uniformity of cooling speed on the half-shaft surface by 40%. The multi-inlet diversion technology can dynamically adjust the flow distribution according to the half-shaft size. When the quenching medium (such as water or PAG solution) comes into contact with the high-temperature surface, it instantly vaporizes and absorbs heat, causing the surface temperature of the spline to drop below the martensitic transformation point within 5-8 seconds, forming a fine martensitic structure. The surface hardness can reach 58-62HRC, and the wear resistance is improved by more than 30%. The annular structure and the effective ring are arranged coaxially to ensure precise matching between the quenching area and the heating area, avoiding accidental cooling of non-quenching areas, and achieving a process consistency of more than 95%.

[0028] This application utilizes multiple cooling water pipes 506 (e.g., four symmetrically distributed pipes) spirally wound around a copper conductor 404. These pipes are made of 316L stainless steel with an outer diameter of 8-10 mm and feature a micro-rib structure on the inner wall (rib height 0.5 mm, spacing 2 mm). Adjacent pipes have opposite spiral directions (creating forward and reverse turbulent flow). Cooling water is evenly distributed through a "one-inlet, two-outlet water distributor 503," flowing spirally within the pipes at a velocity of 1.5-2.0 m / s. This increases the contact area with the copper conductor 404 by 60% compared to traditional straight-line pipes. The reverse spiral flow design increases the turbulence intensity of the cooling water by 50%, raising the convective heat transfer coefficient from the traditional 2000W / (m²・K) to 3500W / (m²・K). The surface temperature of the 404 copper conductor can be controlled at 60-80℃ (compared to approximately 120-150℃ in the traditional design), with a resistance increase of <8% (compared to >20% in the traditional solution), and improved heating power stability. The micro-rib structure strengthens boundary layer disturbance, reducing the risk of scale adhesion (scale buildup rate reduced by 70%), and extending the cooling efficiency decay period from 3 months to over 1 year. The symmetrically distributed water pipe assembly forms a uniform thermosiphon effect, with a circumferential temperature difference of <5℃ in the 404 copper conductor, avoiding weld cracking or material annealing caused by local overheating. The effective coil life is extended from the traditional 500-800 hours to 2000-3000 hours, and maintenance costs are reduced by 60%.

[0029] In the above-mentioned medium-frequency quenching inductor for machining splines on automotive half-shafts, as a preferred embodiment, the medium-frequency quenching inductor further includes: an encapsulation part 6, which fills the gap and the outside of the effective ring and the cooling water component 5, and the overall shape of the encapsulation part 6 is annular.

[0030] In the aforementioned medium-frequency quenching inductor for machining splines on automotive half-shafts, as a preferred embodiment, the encapsulation part 6 is refractory putty, vermiculite putty, or ceramic fiber putty.

[0031] In the above-mentioned medium-frequency quenching inductor for machining splines on automotive half-shafts, as a preferred embodiment, the medium-frequency quenching inductor further includes: a base plate 101, a side plate 102 and an inlet slot 401 fixedly disposed on the side of the base plate 101, the inlet slot 401 of the copper conductor 404 being fixed sequentially through the end face of the side plate 102 and the inlet slot 401, and a terminal block 403 being disposed at the end of the inlet slot 401 of the copper conductor 404.

[0032] In the aforementioned medium-frequency quenching inductor for machining splines on automotive half-shafts, as a preferred embodiment, there are two base plates 101, two inlet slots 401, and two side plates 102. The copper conductor 404 has two inlet slots 401. The two base plates 101, the two inlet slots 401, and the two side plates 102 are respectively connected to the two inlet slots 401. The two side plates 102 are arranged opposite to each other, and a clamping plate 103 is provided between the two side plates 102. The clamping plate 103 is fixedly connected to both side plates 102.

[0033] In the aforementioned medium-frequency quenching inductor for machining splines on automotive half-shafts, as a preferred embodiment, the medium-frequency quenching inductor further includes: a rear support plate 201, which is vertically fixed, and the quenching water component and the cooling water component 5 are both mounted on the rear support plate 201; a central hole 203 is provided on the rear support plate 201, which is used to accommodate the target half-shaft; the quenching water component, the effective ring, and the cooling water component 5 are all coaxially arranged with the central hole 203.

[0034] In some embodiments, the single-inlet / double-outlet water distributor 503 is a cuboid injection-molded part, which is also used to fix the cooling water pipe 506. In this case, the single-inlet / double-outlet water distributor 503 is snapped or glued to the rear support plate 201. As a preferred embodiment, multiple square holes can be opened on the rear support plate 201 for installing the single-inlet / double-outlet water distributor 503.

[0035] In the aforementioned medium-frequency quenching inductor for machining splines on automotive half-shafts, as a preferred embodiment, the quenching water component includes a quenching water component body 301, at least one first quenching water inlet 303, and at least one second quenching water inlet 304. The quenching water component body 301 has a hollow annular structure. The inner surface of the quenching water component body 301 is inclined to face the effective ring, and a plurality of quenching water holes 302 are provided on the inner surface of the quenching water component body 301. At at least one first quenching water inlet 303 or at least one second quenching water inlet 304, the quenching water component sprays quenching water onto the target half-shaft at the center of the effective ring through the quenching water holes 302 to quench the target half-shaft.

[0036] In the aforementioned medium-frequency quenching inductor for machining splines on automotive half-shafts, as a preferred embodiment, the cooling water component 5 further includes N cooling water inlets 501, N cooling water outlets 502, 2N inlet pipes 504, and 2N outlet pipes 505; the cooling water pipes 506 are spiral-shaped and all wound around the copper conductor 404, with inlet pipes 504 and outlet pipes 505 respectively provided at both ends of the cooling water pipes 506; two adjacent inlet pipes 504 are connected to the cooling water inlet 501 through a one-inlet-two-outlet water divider 503, and two adjacent outlet pipes 505 are connected to the cooling water outlet 502 through a one-inlet-two-outlet water divider 503.

[0037] In the aforementioned medium-frequency quenching inductor for machining splines on automotive half-shafts, as a preferred embodiment, the cooling water component 5 includes four cooling water pipes 506 and four one-inlet-two-distributor water separators. The four cooling water pipes 506 are distributed on the circumference of the copper conductor 404. The spiral directions of adjacent cooling water pipes 506 are opposite. There are two cooling water inlets 501 and two cooling water outlets 502. Each pair of adjacent cooling water pipes 506 shares one cooling water inlet 501 or one cooling water outlet 502. The two cooling water inlets 501 are connected to four inlet pipes 504 through two one-inlet-two-distributor water separators 503. The two cooling water outlets 502 are connected to four outlet pipes 505 through two one-inlet-two-distributor water separators 503.

[0038] Please refer to Figure 5 and Figure 8 In some embodiments, the one-inlet-two-outlet water separator 503 is an injection molded part. The body of the injection molded part is provided with a first inner hole 513 and two second inner holes 514. A sealing cavity 507 is provided inside the body of the injection molded part. The first inner hole 513 and the two second inner holes 514 are interconnected through the sealing cavity 507.

[0039] Please refer to Figure 6 In some embodiments, since the single-inlet-two-distributor 503 is an injection-molded part with a sealed cavity 507, when the single-inlet-two-distributor 503 is injection-molded, it can be divided into upper and lower parts for injection molding, namely the upper injection body 5031 and the lower injection body 5032. The upper injection body 5031 and the lower injection body 5032 have a symmetrical structure. After the upper injection body 5031 and the lower injection body 5032 are injected separately, the upper injection body 5031 and the lower injection body 5032 are heat-fused together to obtain the injection-molded part body.

[0040] Please refer to Figure 6In some embodiments, both the inlet conduit 504 and the outlet conduit 505 are provided with conduit ends 508. The outer diameter of the conduit end 508 is larger than the outer diameter of the inlet conduit 504 and the outlet conduit 505. The outer diameter of the conduit end 508 is equal to the inner diameter of the second inner hole 514, and the two are interference fit or transition fit. The end of the second inner hole 514 is provided with internal threads. The inlet conduit 504 and the outlet conduit 505 are fixed in the second inner hole 514 by a nut-shaped sleeve 509. The nut-shaped sleeve 509 is threadedly connected to the second inner hole 514.

[0041] Please refer to Figure 6 In some embodiments, the nut-shaped sleeve 509 includes a hexagonal nut square head 5092 and a sleeve external thread portion 5093. The hexagonal nut square head 5092 and the sleeve external thread portion 5093 are connected as one piece and have a through sleeve inner hole 5091 inside. Two contraction slits 5094 are opened on the sleeve external thread portion 5093.

[0042] Please refer to Figure 6 In some embodiments, both the ends of the cooling water inlet 501 and the cooling water outlet 502 are provided with threaded sections 510, and the first inner hole 513 is provided with internal threads. The cooling water inlet 501 or the cooling water outlet 502 is connected to the threaded section 510 of the first inner hole 513 by threads.

[0043] In some embodiments, sealant is applied between the first inner bore 513 and the threaded section 510 during installation. Sealant is also applied between the first inner bore 514 and the conduit end 508 and the external threaded portion 5093 of the sleeve during installation.

[0044] Please refer to Figure 7 and Figure 8 In some embodiments, the single-inlet / two-outlet water distributor 503 is provided with two conduit fixing clips 511, which are used to fix the inlet conduit 504 and the outlet conduit 505. The injection-molded body of the single-inlet / two-outlet water distributor 503 has a conduit fixing groove 512 that extends vertically through the injection-molded body. The conduit fixing groove 512 extends vertically through two second inner holes 514. The two conduit fixing clips 511 are inserted into the conduit fixing groove 512 from the top and bottom of the injection-molded body, respectively, and are engaged with each other in the conduit fixing groove 512.

[0045] Please refer to Figure 9 The catheter fixing buckle 511 includes a large end 5111 and a small end 5112. The width of the large end 5111 is greater than the width of the small end 5112. The sum of the width of the large end 5111 and the width of the small end 5112 is equal to the width of the catheter fixing groove 512.

[0046] In some embodiments, three fork arms are arranged side by side between the large end 5111 and the small end 5112. Each fork arm includes a front fork arm section 5114 and a rear fork arm section 5116. A barbed protrusion 5115 is provided between the front fork arm section 5114 and the rear fork arm section 5116. The barbed protrusion 5115 is located at the midpoint of the fork arm, that is, the lengths of the front fork arm section 5114 and the rear fork arm section 5116 are equal.

[0047] In some embodiments, the inclined surfaces of the fork arm front section 5114 and the fork arm rear section 5116 are parallel to each other.

[0048] In some embodiments, two U-shaped grooves 5117 are provided between the three fork arms, and the two U-shaped grooves 5117 are of the same size. Preferably, the width of the U-shaped groove 5117 is equal to the outer diameter of the inlet conduit 504 and the outlet conduit 505. When the two conduit fixing clips 511 are inserted into the conduit fixing grooves 512 from the top and bottom of the injection molded part body respectively, the bottoms of the two U-shaped grooves 5117 of the two conduit fixing clips 511, which are in opposite positions, clamp the inlet conduit 504 or the outlet conduit 505 from the top and bottom respectively.

[0049] In some embodiments, two sealing blocks 5113 are provided on the inclined surface of the rear section 5116 of the fork arm. The width of the two sealing blocks is equal to the width of the U-shaped groove 5117, and the two sealing blocks 5113 correspond to the two U-shaped grooves 5117 respectively.

[0050] As a preferred embodiment, the inner side of the sealing block 5113 is provided with an inwardly tapered chamfer 5118. The inwardly tapered chamfer 5118 is used to prevent the three forks from getting stuck or interfering with the sealing block 5113 when the two conduit fixing buckles 511 are inserted into the conduit fixing slots 512 from the top and bottom of the injection molded part body, respectively.

[0051] In some embodiments, triangular slots 5119 are respectively provided at the upper and lower ends of the inner sidewalls on both sides of the conduit fixing slot 512, and triangular blocks 5110 are respectively provided at the outer ends of the two fork arms on both sides of the conduit fixing buckle 511. The positions and shapes of the triangular slots 5119 and the triangular blocks 5110 are matched with each other. After the two conduit fixing buckles 511 are inserted into the conduit fixing slot 512 from the top and bottom of the injection molded part body respectively, the four triangular blocks 5110 on the outer sides of the four fork arms on both sides of the two conduit fixing buckles 511 respectively engage with the four triangular slots 5119 of the conduit fixing slot 512.

[0052] In some embodiments, before the two conduit retaining clips 511 are inserted into the conduit retaining slots 512 from the top and bottom of the injection molded part body respectively, resin or sealant is filled or applied to the conduit retaining slots 512; after the two conduit retaining clips 511 are inserted into the conduit retaining slots 512 from the top and bottom of the injection molded part body respectively, all gaps are filled with resin or sealant to achieve a seal.

[0053] Example 1 This embodiment provides a medium-frequency quenching inductor, suitable for quenching splines on passenger car / light truck half-shafts with diameters of Φ40-Φ80mm and lengths ≤300mm. Specific structural parameters are as follows: I. Valid Cycle Components: 404 copper conductor: wall thickness 5mm, turn spacing 6mm, spiral turns 3, inner diameter Φ90mm (gap with half shaft outer diameter 15-20mm). Incoming line 401: Uses a water-cooled cable with a cross-sectional area of ​​120mm², and connects the M12 terminal 403 to the incoming line 401 end with silver solder. Operating parameters: Medium frequency power supply frequency 8-10kHz, heating power 120-150kW, heating time 8-12 seconds.

[0054] II. Quenching water components: Ring-shaped body: outer diameter Φ180mm, inner diameter Φ100mm, wall thickness 8mm; Quenching water holes 302: diameter 1.0mm, hole spacing 6mm, tilt angle 45°, 120 holes evenly distributed circumferentially; Imported configuration: dual inlet design, pipe diameter DN25, working pressure 0.5MPa, quenching medium is 5% PAG aqueous solution.

[0055] III. Cooling water component 5: Cooling water pipe 506: 4 316L stainless steel pipes, outer diameter 8mm, wall thickness 1mm, helix angle 30°; Water flow parameters: single pipe flow rate 3-5L / min, inlet water temperature ≤25℃, outlet water temperature ≤45℃; Water distributor: Made of brass, with an internal flow channel diameter of 12mm and a flow distribution error of <3%.

[0056] IV. Packaging Section 6: Material: Ceramic fiber mortar (refractory temperature 1400℃, thermal conductivity 0.08W / (m・K)); Thickness: 15mm, with an outer protective shell made of 0.5mm thick stainless steel; The process flow for the medium-frequency quenching inductor in this embodiment is as follows: Half-shaft positioning: The actuator (servo electric cylinder) accurately feeds the half-shaft head into the center of the effective circle, with a coaxiality error of ≤±0.3mm; Induction heating: Apply medium-frequency current to raise the surface temperature of the half-shaft to 880-920℃ (infrared temperature measurement monitoring). Quenching and cooling: The quenching water system is activated within 0.5 seconds after heating is completed, and water is sprayed continuously for 6 seconds; Residual heat tempering: After quenching, the material is naturally cooled to 150-200℃, and residual heat is used to achieve self-tempering.

[0057] Example 2 This embodiment provides a medium-frequency quenching inductor suitable for rapid quenching of half-shafts (diameter Φ80-Φ120mm) of heavy-duty trucks / construction vehicles. Embodiment two is largely the same as embodiment one, except that: The effective coil is divided into two sections: the upper section has 2 turns (heating the spline tooth tip) and the lower section has 1 turn (heating the spline root); it also has two independent power supplies with a power ratio of 3:2, realizing gradient heating (tooth tip 900℃, tooth root 860℃).

[0058] The difference also lies in: Set up a three-stage quenching water system, namely: Inner ring: Φ120mm, densely arranged 0.8mm diameter holes (spray distance 15mm); Middle ring: Φ150mm, with 1.0mm diameter holes (spray distance 30mm); Outer ring: Φ180mm, with 1.2mm diameter holes (spray angle 60°, covering the tooth root area).

[0059] Three independent control rings enable segmented quenching and cooling (tooth tip cooling rate > 200℃ / s, tooth root cooling rate 150℃ / s). The difference also lies in: Set up a structure to enhance cooling, namely: The number of cooling water pipes has been increased to 6, and they are arranged in a double-layer spiral pattern (3 inner pipes with an outer diameter of 8mm; 3 outer pipes with an outer diameter of 10mm). The inner wall of the water pipe is machined with threaded grooves to enhance the turbulence effect and increase the heat transfer coefficient to 4000W / (m²・K).

[0060] This application also provides a quenching device for machining splines on automotive half-shafts. The quenching device includes a medium-frequency quenching inductor for machining splines on automotive half-shafts as described in Embodiment 1 or Embodiment 2 above, and also includes an actuator for moving the head of the target half-shaft into the effective circle of the medium-frequency quenching inductor.

[0061] Those skilled in the art will understand that all or part of the functions of the various methods in the above embodiments can be implemented by hardware or by computer programs. When all or part of the functions in the above embodiments are implemented by computer programs, the program can be stored in a computer-readable storage medium, which may include: read-only memory, random access memory, disk, optical disk, hard disk, etc., and the program is executed by a computer to achieve the above functions. For example, the program can be stored in the memory of a device, and when the program in the memory is executed by the processor, all or part of the above functions can be achieved. In addition, when all or part of the functions in the above embodiments are implemented by computer programs, the program can also be stored in a server, another computer, disk, optical disk, flash drive, or external hard drive, etc., and can be downloaded or copied to the memory of a local device, or the system of the local device can be updated. When the program in the memory is executed by the processor, all or part of the functions in the above embodiments can be achieved.

[0062] The above examples illustrate this application only to aid understanding and are not intended to limit its scope. Those skilled in the art to which this application pertains can make various simple deductions, modifications, or substitutions based on the ideas presented.

Claims

1. A medium-frequency quenching inductor for machining splines on automotive half-shafts, used for medium-frequency quenching of the head of a target half-shaft, characterized in that, The medium-frequency quenching inductor used for machining splines on automotive half-shafts includes: An effective loop is provided, wherein a copper conductor is disposed within the effective loop; the copper conductor is a spiral shape comprising at least one turn; when the target half-shaft is placed in the effective loop and a changing current is input to the copper conductor, the copper conductor heats the target half-shaft through electromagnetic induction; Quenching water component, wherein quenching water is supplied; after the target half-shaft is heated, the quenching water component is used to spray quenching water onto the target half-shaft for quenching. The cooling water component includes 2N cooling water pipes and 2N one-inlet-two-distributor water inlets, where N is a positive integer. Each cooling water pipe is wound around the copper conductor, and adjacent cooling water pipes have opposite spiral directions. Cooling water is input into the cooling water pipes through the one-inlet-two-distributor water inlets. When the effective coil heats the target half-shaft, the cooling water pipes are used to cool the copper conductor. The one-inlet-two-distributor water inlets are rectangular injection molded parts and are also used to fix the cooling water pipes.

2. The medium-frequency quenching inductor for machining splines on automotive half-shafts as described in claim 1, characterized in that, The medium-frequency quenching inductor also includes: The encapsulation part fills the gap and the outside of the effective ring and the cooling water component, and the overall shape of the encapsulation part is annular.

3. The medium-frequency quenching inductor for machining splines on automotive half-shafts as described in claim 2, characterized in that, The encapsulation part is refractory mud, vermiculite mud, or ceramic fiber mud.

4. The medium-frequency quenching inductor for machining splines on automotive half-shafts as described in claim 1, characterized in that, The medium-frequency quenching inductor also includes: The base plate has a side plate and an inlet slot fixedly installed on its side. The inlet wire of the copper conductor is fixed through the end face of the side plate and the inlet slot in sequence. A terminal post is provided at the end of the inlet wire of the copper conductor.

5. The medium-frequency quenching inductor for machining splines on automotive half-shafts as described in claim 4, characterized in that, There are two base plates, two inlet slots, and two side plates. There are two inlet wires for the copper conductor. The two base plates, two inlet slots, and two side plates are respectively connected to the two inlet wires. The two side plates are arranged opposite each other, and a clamp is provided between the two side plates. The clamp is fixedly connected to both side plates.

6. The medium-frequency quenching inductor for machining splines on automotive half-shafts as described in claim 1, characterized in that, The medium-frequency quenching inductor also includes: A rear support plate is vertically fixed, and both the quenching water component and the cooling water component are installed on the rear support plate. The rear support plate has a central hole for accommodating the target half-shaft; the quenching water component, the effective ring, and the cooling water component are all coaxially arranged with the central hole.

7. The medium-frequency quenching inductor for machining splines on automotive half-shafts as described in claim 1 or 6, characterized in that, The quenching water component includes a quenching water component body, at least one first quenching water inlet and at least one second quenching water inlet, wherein the quenching water component body has a hollow annular structure. The inner side of the quenching water component body is inclined to face the effective ring, and a plurality of quenching water holes are provided on the inner side of the quenching water component body; at least one first quenching water inlet or at least one second quenching water inlet, the quenching water component sprays quenching water onto the target half-shaft at the center of the effective ring through the quenching water holes to quench the target half-shaft.

8. The medium-frequency quenching inductor for machining splines on automotive half-shafts as described in claim 1 or 6, characterized in that, The cooling water component also includes N cooling water inlets, N cooling water outlets, 2N inlet pipes, and 2N outlet pipes; The cooling water pipes are spiral-shaped and all wound around the copper conductor. The two ends of the cooling water pipes are respectively provided with inlet pipes and outlet pipes. Two adjacent inlet pipes are connected to the cooling water inlet through a one-inlet-two-outlet water distributor, and two adjacent outlet pipes are connected to the cooling water outlet through a one-inlet-two-outlet water distributor.

9. The medium-frequency quenching inductor for machining splines on automotive half-shafts as described in claim 8, characterized in that, The cooling water component includes four cooling water pipes and four one-inlet-two-distributor water separators. The four cooling water pipes are distributed on the circumference of the copper conductor. The spiral directions of adjacent cooling water pipes are opposite. There are two cooling water inlets and two cooling water outlets. The two cooling water inlets are connected to four inlet pipes through two one-inlet-two-outlet water distributors. The two cooling water outlets are connected to four outlet pipes through two one-inlet-two-outlet water distributors.

10. A quenching device for machining splines on automobile half-shafts, characterized in that, The quenching device includes a medium-frequency quenching inductor for machining splines on an automotive half-shaft as described in any one of claims 1 to 9, and further includes an actuator for moving the head of the target half-shaft into the effective circle of the medium-frequency quenching inductor.

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