Water spraying box for induction hardening
By using an aluminum alloy and brass spray box design, the problems of spray box sealing and cooling uniformity are solved, achieving efficient and reliable quenching cooling effect, simplifying the maintenance process, and extending the service life of the equipment.
Patent Information
- Application Number
- CN202511331852.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-18
- Publication Date
- 2025-12-12
AI Technical Summary
The existing water spray box has insufficient sealing reliability, making it difficult to balance cooling efficiency and uniformity. It is also difficult to maintain, and the traditional structure is easily damaged, which affects the quenching quality.
The design features an aluminum alloy shell and a brass inner sleeve, combined with a sealing ring and locating pins to achieve a detachable connection. The inner sleeve is fixed to the shell with bolts and nuts. The spray holes are distributed at an angle to prevent quenching liquid leakage and splashing, thereby improving cooling uniformity.
It improves the sealing reliability and cooling efficiency of the water spray box, ensures quenching quality, simplifies the maintenance process, and extends service life.
Smart Images
Figure CN121109699A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of induction quenching equipment manufacturing, and relates to a water spraying box for induction quenching. BACKGROUND
[0002] In the field of metal heat treatment, especially in the induction scanning quenching process, the water spraying box is a core component for realizing rapid and uniform cooling of a part surface. The advantages and disadvantages of the cooling performance directly affect the quenching hardness, uniformity of the structure (such as avoiding soft spots) and deformation control of the part (such as preventing cracks). However, the current commonly used water spraying box structure still has the following technical problems: 1. Poor sealing reliability: under the conditions of high-pressure quenching liquid impact and long-term thermal cycling, the sealing ring of the traditional detachable water spraying box is prone to aging and damage. Moreover, since the fastening bolts pass through the cavity, the quenching liquid is easily sprayed out from the sealing ring and the bolt connection gap, and splashes onto the surface of the high-temperature part, causing quenching soft spots and affecting the quality of the hardened layer.
[0003] 2. Contradiction between cooling efficiency and uniformity: In order to pursue high cooling speed, dense spray holes and small angle design are often used, but this easily leads to mutual interference of quenching liquid flow and upward splashing, which also causes local cooling deficiency of the part surface and phenomena such as soft spots. At the same time, a single spray intensity cannot meet the differentiated needs for cooling rate at different stages of the scanning quenching process, such as the requirements for the initial rapid cooling period and the final slow cooling period, and cannot take into account the dual goals of "sufficient martensite transformation" and "prevention of quenching cracks".
[0004] 3. Poor maintenance convenience: The inside of the water spraying box is prone to depositing scale and impurities, which need to be cleaned frequently to ensure the unobstructedness of the spray holes and the cooling effect. The traditional non-detachable structure needs to be cleaned thoroughly by using pickling, gas cutting and baking. The traditional detachable structure usually adopts purple copper or plastic structure, which is prone to stress deformation or thermal deformation, causing changes in the water spraying angle and liquid leakage. Moreover, the outer shell is connected with the bolts through the cooperation of the through hole, and repeated disassembly may cause the inner thread to slip, resulting in the scrap of the outer shell. The water jacket as a whole needs to be connected with the machine tool main body by using multiple bolts, and the bolts need to be removed during disassembly and cleaning, which seriously affects the product quality and maintenance efficiency. SUMMARY
[0005] The purpose of the present application is to solve the above-mentioned problems in the prior art, and to provide a water spraying box for induction quenching, which is easy to disassemble and maintain, has high sealing reliability, avoids leakage of quenching liquid from the top end shell and the inner sleeve sealing part, causing quenching soft spots, and has good uniformity on the basis of high cooling efficiency.
[0006] To achieve the above object, the solution of the present application is: a water spraying box for induction quenching, comprising a shell made of aluminum alloy, an inner sleeve made of brass, an inner water nozzle, a plug, a sleeve support and a bottom plate; the shell has an inner hole with a cylindrical lower end and a circular table upper end, and the upper end has a boss protruding into the inner hole; the inner sleeve has the same wall thickness, and its inner wall and outer wall are both circular table type, and its bottom wall has a step protruding outward; the inner sleeve is placed in the inner hole of the shell, and the step and the shell are fixed together by three pairs of bolts and nuts, leaving a water channel between the inner sleeve and the shell, and a sealing ring I is pressed between the upper end of the inner sleeve and the boss of the upper end of the shell; the inner sleeve has a plurality of spraying holes inclined downward and distributed on adjacent circles in the cavity, and the spraying holes at the upper end of the inner sleeve are densely distributed, and the spraying holes at the lower end are sparsely distributed; the shell wall has threaded holes communicating with the water channel, and the inner water nozzle is threadedly connected in the threaded holes 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, and the water inlet is connected to a water inlet pipe; the inner water nozzle is sealingly placed in the long arm of the L-shaped water inlet channel of the sleeve support, and is fixed by a plug inserted into the key groove on the outer wall of the inner water nozzle and the sleeve support slot; the sleeve support is fixed on the bottom plate, and the bottom plate is fixed on the machine tool.
[0007] Further preferably, a positioning pin is further provided between the sleeve support and the shell, one end of the positioning pin is inserted into a positioning slot on the shell, and the other end is threadedly connected into a threaded hole provided on the sleeve support. The positioning pin makes the positioning more accurate and the installation more convenient and fast when the shell and the sleeve support are installed.
[0008] Further preferably, two or more long step holes are provided in the middle of the bottom plate, and vertical long holes are provided at both ends; the sleeve support is provided with threaded holes at positions corresponding to the long step holes of the bottom plate, the sleeve support is fixed to the bottom plate by bolts, and the bottom plate is fixed to the machine tool by screws through the vertical long holes. The long step holes on the bottom plate facilitate the horizontal centering adjustment of the sleeve support.
[0009] Further preferably, the spraying holes are inclined downward by 30-40°, and most preferably by 35°, to prevent the quenching liquid from splashing upward and avoid quenching soft spots.
[0010] Further preferably, a stop block is provided at the position where the boss of the upper end of the shell contacts the inner hole of the inner sleeve. The stop block prevents the quenching liquid from being horizontally sprayed onto the surface of the part due to damage to the sealing ring I, and avoids quenching soft spots.
[0011] Further preferably, the angle between the side wall of the circular table type inner sleeve and the horizontal plane of the bottom is 75-85°, and most preferably 80°. This not only allows the downward flowing water to be discharged more smoothly without backflow, but also increases the cooling effect.
[0012] The shell is made of aluminum alloy, the inner sleeve is made of brass, the shell is detachably connected with the sleeve support through the inner water nozzle and the plug, when cleaning the water spraying box, the plug is pulled out, the shell is pulled out together with the inner sleeve and the inner water nozzle, the bolt and the nut fixing the shell and the inner sleeve are disassembled, the inside of the water spraying box can be cleaned, the disassembly is fast and convenient, the maintenance is easy, the parts are not easy to be deformed by force or heat, the parts are not easy to be damaged after multiple disassembly, the service life is prolonged, and the maintenance efficiency is improved. The sealing reliability is high, the quenching liquid is prevented from leaking from the sealing position of the top shell and the inner sleeve, and quenching soft spots are avoided. The inner sleeve is designed in the form of a brass round table, the high-temperature quenching liquid generated during quenching can be quickly discharged, and the cooling performance is improved; the spray holes are designed to be dense at the top and sparse at the bottom, the step cooling effect during scanning quenching can be achieved, that is, the cooling is fast in the initial stage to ensure complete transformation of martensite, and the cooling is slow in the final stage to avoid cracks caused by quenching stress. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 is a perspective view of the present application; Figure 2 is a top view of the present application; Figure 3 is an AA sectional view of the present application; Figure 2 Figure 4 is a BB sectional view of the present application; Figure 2 Figure 5 is a right view of the present application. DETAILED DESCRIPTION
[0014] The present application will be further described below in combination with specific embodiments.
[0015] As Figures 1 to 5 As shown, the embodiment includes a shell 1 made of aluminum alloy, an inner sleeve 2 made of brass, an inner water nozzle 18, a plug 10, a sleeve support 11 and a base plate 12. The shell 1 has an inner hole with a cylindrical lower end and a circular table upper end, and a boss 6 protruding into the inner hole at the upper end. The inner wall and the outer wall of the inner sleeve 2 are both circular table type, and the bottom wall has a step 9 protruding outward. The angle between the side wall of the circular table type inner sleeve 2 and the bottom horizontal plane is 75-85°, and the best is 80°. Not only can the flowing water be discharged more smoothly, but also the backwater phenomenon is not generated, and the cooling effect is increased. The inner sleeve 2 is placed in the inner hole of the shell 1, and the step 9 is fixed with the shell 1 by three pairs of bolts 4 and nuts 5. The water channel 3 is left between the inner sleeve 2 and the shell 1, and the sealing ring I 7 is pressed between the upper end of the inner sleeve 2 and the boss 6 of the upper end of the shell 1. The position where the boss 6 of the upper end of the shell 1 contacts the inner hole of the inner sleeve 2 is provided with a stop block 8 which protrudes into the inner hole of the inner sleeve 2. The stop block 8 prevents the quenching liquid from being sprayed horizontally onto the surface of the part due to the damage of the sealing ring I 7, and avoids the quenching soft point. The inner sleeve 2 has a plurality of downwardly inclined spray holes 15 which are distributed in the cavity and cross each other at adjacent circles. The spray holes 15 at the upper end of the inner sleeve 2 are densely distributed, and the spray holes 15 at the lower end are sparsely distributed. The spray holes 15 are inclined downwardly by 30-40° in the cavity, and the best is 35°, which prevents the quenching liquid from being upwardly splashed to avoid the quenching soft point. The shell 1 has threaded holes which are connected with the water channel 3, and the inner water nozzle 18 is screwed into the threaded holes of the shell 1. The sleeve support 11 has an L-shaped water inlet channel 19, and the short arm of the L-shaped water inlet channel 19 is detachably fixed with a water inlet 20 which is connected with a water pipe. The water pipe of the embodiment is a hose. The inner water nozzle 18 is sealed by the double-layer sealing ring II 17 and placed in the long arm of the L-shaped water inlet channel 18 of the sleeve support 11, and is fixed by the plug 10 which is inserted into the key groove on the outer wall of the inner water nozzle 18 and the slot of the sleeve support 11. The sleeve support 11 and the shell 1 are further provided with a positioning pin 16 which is inserted into the positioning slot on the shell 1 at one end, and is screwed into the threaded hole on the sleeve support 11 at the other end. The positioning pin 16 makes the positioning more accurate and the installation more convenient and fast when the shell 1 and the sleeve support 11 are installed. The sleeve support 11 is fixed on the base plate 12. The specific structure of the embodiment is that the base plate 12 has a long step hole in the middle, the sleeve support 11 has a threaded hole 14 which is opposite to the long step hole of the base plate 12, and the sleeve support 12 is fixed on the base plate 12 by bolts. The base plate 12 has vertical long strip holes 13 at both ends, and is fixed on the machine tool by screws through the vertical long strip holes 13. The long step hole of the base plate 12 facilitates the horizontal centering adjustment of the sleeve support 11.
[0016] The above described embodiments are only preferred and exemplary, and are not intended to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
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 side wall of the frustum-shaped inner sleeve 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 side wall of the frustum-shaped inner sleeve and the bottom horizontal plane is 40-60°.