Water spraying box for induction hardening

Abstract

The utility model discloses a kind of water spraying boxes for induction quenching, inner sleeve is placed in the inner hole of shell, its step is fixed together with shell by more than three pairs of bolt and nut, sealing ring I is crimped between inner sleeve upper port and shell upper port boss;Multiple spraying holes that are downwardly inclined to cavity and adjacent circumferential cross distribution are opened in inner sleeve, and the spraying hole of inner sleeve is dense on top and sparse below;Inner water nozzle is threadedly connected in the threaded hole of shell;L-shaped water inlet channel is opened in sleeve support, and water inlet is detachably fixed in the short arm of L-shaped water inlet channel;Inner water nozzle sealing is placed in the long arm of L-shaped water inlet channel of sleeve support, and is fixed by the plugboard clamping of key groove inserted in sleeve support slot and the outer wall of inner water nozzle;Sleeve support is fixed on bottom plate.The utility model is convenient to disassemble, easy to maintain;Sealing has high reliability, avoid quenching liquid from top shell and inner sleeve sealing leakage, cause quenching soft point;On the basis that cooling efficiency is higher, its uniformity is better.

Description

Technical Field

[0001] This utility model belongs to the technical field of induction hardening equipment manufacturing, and relates to a water spray box for induction hardening. Background Technology

[0002] In the field of metal heat treatment, especially in induction hardening, the water spray box is a core component for achieving rapid and uniform cooling of the part surface. Its cooling performance directly affects the hardness of the quenched material, the uniformity of the microstructure (e.g., avoiding soft spots), and the control of part deformation (e.g., preventing cracks). However, the currently widely used water spray box structure still has the following technical problems: 1. Insufficient sealing reliability: Under the impact of high-pressure quenching liquid and long-term thermal cycling, the sealing ring of the traditional detachable water spray box is prone to aging and damage. In addition, since the fastening bolts pass through the cavity, the quenching liquid is prone to spray out from the sealing ring and the bolt connection gap, splashing onto the surface of high-temperature parts, causing quenching soft spots and affecting the quality of the hardened layer.

[0003] 2. The contradiction between cooling efficiency and uniformity: In pursuit of high cooling rate, dense nozzles and small angle design are often adopted, but this can easily lead to mutual interference of quenching liquid flow and upward splashing, which can also cause insufficient cooling of parts surface and soft spots. At the same time, a single spray intensity is difficult to adapt to the different cooling rate requirements of different stages in the scanning quenching process, such as the requirements of the initial rapid cooling period and the final slow cooling period, and cannot achieve the dual goals of "full martensitic transformation" and "suppressing quenching cracks".

[0004] 3. Poor Maintenance Convenience: Scale and impurities easily accumulate inside the water spray box, requiring frequent cleaning to ensure unobstructed nozzles and effective cooling. Traditional non-removable structures require acid pickling and oxy-fuel cutting for thorough cleaning. Traditional removable structures are typically made of copper or plastic, which are prone to deformation under stress or heat, causing changes in the spray angle and leakage. Furthermore, the outer casing is connected to bolts via threaded holes; repeated disassembly can strip the internal threads, rendering the casing unusable. The water jacket itself requires multiple bolts to connect to the machine body, necessitating bolt removal for disassembly and cleaning, severely impacting product quality and maintenance efficiency. Utility Model Content

[0005] The purpose of this invention is to solve the above-mentioned problems in the prior art and provide a water spray box for induction hardening, which is easy to disassemble and maintain; it has high sealing reliability, avoiding leakage of quenching liquid from the top shell and inner sleeve seal, thus preventing quenching soft spots; and it has good uniformity while having high cooling efficiency.

[0006] To achieve the above objectives, the solution of this utility model is: a water spray box for induction hardening, comprising a shell made of aluminum alloy, an inner sleeve made of brass, an inner water nozzle, a plug plate, a sleeve support, and a base plate; the shell has an inner hole with a cylindrical lower end and a frustum-shaped upper end, and the upper end has a boss protruding into the inner hole; the inner sleeve has a uniform wall thickness, and both its inner and outer walls are frustum-shaped, with an outwardly protruding step on its bottom wall; the inner sleeve is placed inside the inner hole of the shell, and its step is fixed to the shell by three or more pairs of bolts and nuts, a water channel is left between the inner sleeve and the shell, and a tight seal is pressed between the upper end of the inner sleeve and the boss at the upper end of the shell. The inner sleeve has multiple spray holes that slope downwards into the cavity and are distributed in an intersecting pattern around the circumference. The spray holes at the upper end of the inner sleeve are densely distributed, while those at the lower end are sparsely distributed. The outer shell wall has a threaded hole that communicates with the water channel, and the inner water nozzle is threaded into the threaded hole of the shell. The sleeve support has an L-shaped water inlet channel, and a water inlet is detachably fixed in the short arm of the L-shaped water inlet channel. The water inlet is connected to the water inlet pipe. The inner water nozzle is sealed in the long arm of the L-shaped water inlet channel of the sleeve support and is secured by a plate inserted into the keyway on the outer wall of the inner water nozzle and the sleeve support slot. The sleeve support is fixed on the base plate, and the base plate is fixed on the machine tool.

[0007] More preferably, a positioning pin is provided between the sleeve support and the housing. One end of the positioning pin is inserted into a positioning groove on the housing, and the other end is threaded into a threaded hole on the sleeve support. The positioning pin makes the positioning of the housing and the sleeve support more accurate and the installation more convenient and faster.

[0008] More preferably, the base plate has two or more elongated stepped holes in the middle and vertical elongated holes at both ends; the sleeve support has threaded holes at positions corresponding to the elongated stepped holes in the base plate, and the sleeve support is fixed to the base plate with bolts, while the base plate is fixed to the machine tool with screws through the vertical elongated holes. The elongated stepped holes on the base plate facilitate the horizontal alignment adjustment of the sleeve support.

[0009] More preferably, the spray hole is inclined downwards into the cavity at 30-40°, preferably 35°, to prevent the quenching liquid from splashing upwards and avoid quenching soft spots.

[0010] More preferably, a stop block is provided at the position where the upper port boss of the housing contacts the inner hole of the inner sleeve, protruding into the inner hole of the inner sleeve. The stop block is provided to prevent quenching liquid from being sprayed horizontally onto the surface of the part due to damage to the sealing ring I, thus avoiding soft spots during quenching.

[0011] More preferably, the angle between the inner sleeve sidewall and the bottom horizontal plane is 75-85°, with 80° being optimal. This not only allows the flowing water to drain more smoothly and prevents backflow, but also increases the cooling effect.

[0012] The beneficial effects of this utility model are as follows: The shell is made of aluminum alloy, and the inner sleeve is made of brass. The shell is detachably connected to the sleeve support by an inner water nozzle and a plate. When cleaning the spray box, simply pull out the plate, remove the shell along with the inner sleeve and the inner water nozzle, and remove the bolts and nuts that fix the shell and the inner sleeve to clean the inside of the spray box. Disassembly is quick and convenient, easy to clean and maintain, and the components are not easily deformed by force or heat. Repeated disassembly is not easily damaged, extending the service life and improving maintenance efficiency. This utility model has high sealing reliability, preventing quenching liquid from leaking from the top shell and inner sleeve seal, causing quenching soft spots. The inner sleeve uses a brass frustum design, which allows the high-temperature quenching liquid generated during quenching to be discharged quickly, improving cooling performance. The spray holes adopt a dense upper and sparse lower design, which can achieve a stepped cooling effect during scanning quenching, that is, rapid cooling in the initial stage to ensure complete martensite transformation, and slow cooling in the final stage to avoid cracks caused by quenching stress. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a top view of the present invention; Figure 3 for Figure 2 AA section view; Figure 4 for Figure 2 BB cross-sectional view; Figure 5 This is the right view of the present invention. Detailed Implementation

[0014] The present invention will be further described below with reference to specific embodiments.

[0015] like Figures 1 to 5As shown, this embodiment includes a housing 1 made of aluminum alloy, an inner sleeve 2 made of brass, an inner water nozzle 18, an insert plate 10, a sleeve support 11, and a base plate 12. The housing 1 has an inner hole with a cylindrical lower end and a frustum-shaped upper end, and a boss 6 protruding into the inner hole at the upper end. The inner and outer walls of the inner sleeve 2 are both frustum-shaped, with an outwardly protruding step 9 on its bottom wall. In this embodiment, the angle between the side wall of the frustum-shaped inner sleeve 2 and the bottom horizontal plane is 75-85°, with 80° being optimal. This not only allows for smoother drainage of downstream water without backflow, but also increases the cooling effect. The inner sleeve 2 is placed inside the inner hole of the housing 1, and its step 9 is fixed to the housing 1 by three or more pairs of bolts 4 and nuts 5. A water channel 3 is left between the inner sleeve 2 and the housing 1, and a sealing ring I 7 is press-fitted between the upper end of the inner sleeve 2 and the boss 6 at the upper end of the housing 1. In this embodiment, a stop block 8 is provided at the position where the upper port boss 6 of the housing 1 contacts the inner hole of the inner sleeve 2, protruding into the inner hole of the inner sleeve 2. The stop block 8 is provided to prevent the quenching liquid from being sprayed horizontally onto the surface of the part due to the damage of the sealing ring I7, thus avoiding soft spots during quenching. The inner sleeve 2 has multiple spray holes 15 that are inclined downwards into the cavity and are distributed in an intersecting pattern on adjacent circumferences. The spray holes 15 at the upper end of the inner sleeve 2 are densely distributed, while those at the lower end are sparsely distributed. In this embodiment, the spray holes 15 are inclined downwards into the cavity at 30-40°, preferably 35°, to prevent the quenching liquid from splashing upwards and avoiding soft spots during quenching. The housing 1 has a threaded hole that communicates with the water channel 3, and the inner water nozzle 18 is threaded into the threaded hole of the housing 1. The sleeve support 11 has an L-shaped water inlet channel 19, and a water inlet 20 is detachably fixed in the short arm of the L-shaped water inlet channel 19. The water inlet 20 is connected to a water inlet pipe, which is a flexible hose in this embodiment. The inner water nozzle 18 is sealed within the long arm of the L-shaped inlet channel 18 of the sleeve support 11 by a double-layer sealing ring II 17, and is secured by a plate 10 inserted into the slot of the sleeve support 11 and the keyway on the outer wall of the inner water nozzle 18. In this embodiment, a positioning pin 16 is also provided between the sleeve support 11 and the housing 1. One end of the positioning pin 16 is inserted into a positioning groove on the housing 1, and the other end is threaded into a threaded hole on the sleeve support 11. The positioning pin 16 makes the positioning of the housing 1 and the sleeve support 11 more accurate and the installation more convenient and quick. The sleeve support 11 is fixed to the base plate 12. Specifically, in this embodiment, the base plate 12 has a long stepped hole in the middle, and the sleeve support 11 has a threaded hole 14 at the position opposite to the long stepped hole on the base plate 12. The sleeve support 12 is fixed to the base plate 12 by bolts. The base plate 12 has vertical elongated holes 13 at both ends; the base plate 12 is fixed to the machine tool by screws through the vertical elongated holes 13. The elongated stepped holes on the base plate 12 facilitate the horizontal centering adjustment of the sleeve support 11.

[0016] The above-described embodiments are merely preferred and exemplary, and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A water spray box for induction hardening, characterized in that: The system includes an aluminum alloy housing, a brass inner sleeve, an inner water nozzle, a plug plate, a sleeve support, and a base plate. The housing has an inner hole with a cylindrical lower end and a frustum-shaped upper end, with a protruding boss at the upper end. The inner sleeve has a uniform wall thickness, with both its inner and outer walls being frustum-shaped, and an outwardly protruding step on its bottom wall. The inner sleeve is placed inside the housing's inner hole, and its steps are fixed to the housing by three or more pairs of bolts and nuts. A water channel is provided between the inner sleeve and the housing, and a sealing ring I is press-fitted between the upper end of the inner sleeve and the boss at the upper end of the housing. Multiple inward-facing cavities are provided on the inner sleeve. The spray holes are inclined downwards and intersected by adjacent circumferences. The spray holes are densely distributed at the upper end of the inner sleeve and sparsely distributed at the lower end. The shell wall has a threaded hole that communicates with the water channel. The inner water nozzle is threaded into the threaded hole of the shell. The sleeve support has an L-shaped water inlet channel. The water inlet is detachably fixed in the short arm of the L-shaped water inlet channel and connected to the water inlet pipe. The inner water nozzle is sealed in the long arm of the L-shaped water inlet channel of the sleeve support and is fixed by a plate inserted into the keyway on the outer wall of the inner water nozzle and inserted into the slot of the sleeve support. The sleeve support is fixed on the base plate, and the base plate is fixed on the machine tool.

2. The water spray box for induction hardening according to claim 1, characterized in that: A positioning pin is also provided between the sleeve support and the housing. One end of the positioning pin is inserted into the positioning groove on the housing, and the other end is threaded into the threaded hole on the sleeve support.

3. The water spray box for induction hardening according to claim 1 or 2, characterized in that: The base plate has two or more elongated stepped holes in the middle and vertical elongated holes at both ends; the sleeve support has threaded holes at the positions of the elongated stepped holes on the base plate, the sleeve support is fixed to the base plate with bolts, and the base plate is fixed to the machine tool with screws through the vertical elongated holes.

4. The water spray box for induction hardening according to claim 3, characterized in that: The spray nozzles are tilted downwards at 30-40° into the cavity.

5. The water spray box for induction hardening according to claim 4, characterized in that: A stop block is provided at the position where the upper port boss of the housing contacts the inner hole of the inner sleeve, allowing it to penetrate into the inner hole of the inner sleeve.

6. The water spray box for induction hardening according to claim 5, characterized in that: The angle between the inner sleeve sidewall and the bottom horizontal plane is 75-85°.

7. The water spray box for induction hardening according to claim 1 or 2, characterized in that: The spray nozzles are tilted downwards at 30-40° into the cavity.

8. The water spray box for induction hardening according to claim 1 or 2, characterized in that: A stop block is provided at the position where the upper port boss of the housing contacts the inner hole of the inner sleeve, allowing it to penetrate into the inner hole of the inner sleeve.

9. The water spray box for induction hardening according to claim 1 or 2, characterized in that: The angle between the inner sleeve sidewall and the bottom horizontal plane is 40-60°.

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