Inner hole water spraying mandrel

Abstract

The utility model belongs to the field of heat treatment of thrust wheel bodies of chassis parts of engineering machinery, and particularly relates to an inner hole water spraying mandrel which comprises a mandrel body, a water inlet channel penetrating through the mandrel body is arranged in the center of the mandrel body, one end of the water inlet channel is plugged through a plugging plate fixedly connected with the mandrel body, and the other end of the water inlet channel is connected with the mandrel body. The other end extends out of the mandrel body and is connected with external water inlet equipment; the two ends and the middle of the mandrel body are fixedly sleeved with annular supporting plates. The annular supporting plates are fixedly connected through a plurality of guiding devices. Water spraying holes are uniformly distributed in the peripheral surface of the mandrel body; the device is convenient to use, stable in quality and accurate in positioning, the hardness of the thrust wheel body subjected to heat treatment meets the requirement, and the heat treatment difficulty is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of heat treatment of a track wheel body of an engineering machinery chassis, in particular to an inner hole water spraying core shaft. Background Art

[0002] At present, the structure of the supporting roller body used in the chassis of engineering machinery is a rotating body with a through hole in the middle. There is an oil cavity in the middle part of the through hole. The heat treatment requirements are hardening treatment of the inner and outer surfaces. The heat treatment tooling used includes trays at both ends, a mandrel with a water spray function in the middle, and a water spray ring for peripheral cooling. The heat treatment process of the supporting roller is overall heating. The manipulator grabs the workpiece to the cooling position, passes through the mandrel from top to bottom and places it on the tray. The cooling mechanism rotates 90° and is supported by the inner hole mandrel. When the workpiece is laid flat for cooling, the two ends are clamped and rotated with the tray and water is sprayed on the inner and outer surfaces. The outer surface is cooled with a water spray ring. The inner hole water spraying mandrel needs to support the supporting roller body before the pallet is clamped while taking into account the water spraying. The structure of the mandrel is a hollow main shaft in the middle with a water spray hole on the surface. There is a support block at both ends and in the middle. The middle support part is thicker in order to support the oil cavity. The main problems in use are: 1. The roller passes through the inner hole water spray mandrel from one end, and the oil chamber of the roller is often stuck by the thicker support block in the middle of the mandrel and cannot pass smoothly. If the chamfer angle is increased, it will affect the accuracy of the intermediate support positioning; 2. The intermediate support part occupies a large space, which affects the flow of cooling water during quenching. The hardness of the part close to the oil chamber is only about HRC30. The technical requirement for the hardness of the inner hole is above HRC36, and other positions can reach HRC45. The hardness of this position does not actually meet the requirements. The uneven hardness will affect the overall quality strength; 3. The requirements for tooling design and production are high. If the diameter of the inner hole tooling is too large, it will make it difficult for the workpiece to pass through and it is easier to get stuck in the oil chamber. If the design is too small, the overall height position of the workpiece will be inaccurate after the tooling is rotated 90°, and the workpiece is easy to be clamped when clamped. These are common problems in the heat treatment of the inner hole of the roller. To alleviate the above problems, it is necessary to replace the tooling with a new structure so that the tooling can pass through the inner hole of the workpiece more easily without being stuck in the oil chamber, and at the same time, it will not affect the circulation of cooling water. Utility Model Content

[0003] In order to solve the above problems, the utility model provides an inner hole water spray core shaft which is easy to use, has stable quality, accurate positioning, meets the hardness requirements of the supporting wheel body after heat treatment, and reduces the difficulty of heat treatment.

[0004] The utility model discloses an inner hole water spraying mandrel, comprising a mandrel body, wherein a water inlet channel penetrating the mandrel body is arranged at the center of the mandrel body, one end of the water inlet channel is blocked by a blocking plate fixedly connected to the mandrel body, and the other end extends out of the mandrel body and is connected to an external water inlet device;

[0005] Both ends and the middle of the mandrel body are fixedly sleeved with annular support plates; the annular support plates are fixedly connected through a plurality of guide devices;

[0006] Water spray holes are evenly distributed on the circumference of the mandrel body;

[0007] A chamfer is arranged at the edge of the annular support plate on the end of the core shaft body away from the water inlet device; the chamfer is arranged on the side away from the annular support plate located in the middle of the core shaft body.

[0008] Preferably, the guide device is a guide column, one end of which is fixedly connected to the annular support plate on one end of the mandrel body, and the other end passes through the annular support plate located in the middle of the mandrel body and is fixedly connected to the annular support plate on the other end of the mandrel body;

[0009] The central axis of the guide column is parallel to the central axis of the core shaft body and is parallel to each other.

[0010] Preferably, the annular support plate and the core shaft body are fixedly connected by welding.

[0011] Preferably, four guide posts are provided, and the four guide posts are evenly distributed along the circumference of the core shaft body.

[0012] A method for heat treatment of the inner hole of a supporting wheel body, using an inner hole water spraying mandrel to heat treat the inner hole of the supporting wheel body, the method comprising the following steps:

[0013] Step 1: Heating: Use a roller bottom continuous heating furnace to heat the roller body at a temperature of 840±10℃ for 3 hours, and then automatically take it out of the furnace to the designated position;

[0014] Step 2: quenching. The production process of the fully automatic quenching machine is as follows: after the roller body is heated, the robot grabs the supporting wheel body and puts it on the cooling fixture at the cooling station. The cooling fixture includes a tray, which is fixed on the loading platform. An inner-hole water-spraying mandrel vertically passes through the tray and is fixedly connected to the loading platform. After the water inlet pipe passes through the loading platform, it is connected to one end of the water inlet channel on the mandrel body. The end of the roller body with a chamfer on the mandrel body is sleeved on an inner-hole water-spraying mandrel. Under the action of the guide device, the roller body is smoothly sleeved on an inner-hole water-spraying mandrel, and the roller One end of the body is connected to the tray, and then the loading platform drives the supporting roller body to rotate 90 degrees, so that the supporting roller body is in a horizontal state, and the cylinder clamping mechanism is used to drive the peripheral water spraying ring to clamp the supporting roller body. The loading platform drives the workpiece to rotate, and the peripheral water spraying ring and an inner hole water spraying core shaft begin to spray water toward the supporting roller body. After the water spraying is completed, the inner hole water spraying core shaft and the peripheral water spraying ring stop spraying water respectively, and the cylinder clamping mechanism drives the peripheral water spraying ring to return to the initial position, and the loading platform flips back to the initial position, and the manipulator descends to grab the supporting roller body and rises, and the manipulator moves the supporting roller body to the specified position for tempering;

[0015] Process parameters include: peripheral water spray time 240±10s, inner hole water spray delay 170±10s, water spray time 20±5s, peripheral water spray flow 22±1m 3 / h, inner hole water spray flow rate 7±1m 3 / h;

[0016] Step 3: Tempering, using a roller bottom continuous heating furnace, at a temperature of 200±10℃, heating for 2 hours, automatically taking the product out of the furnace to the designated location, completing the heat treatment process;

[0017] Step 4: Self-check: Confirm the quenching surface hardness and tempering surface hardness of the roller body;

[0018] Step 5: Special inspection: Cut the roller body with wire cutting, take a cross section to check the outer surface hardness and hardened layer depth of the roller body, the surface hardness and hardened layer depth of the inner hole, and the hardness of the inner diameter surface is required to be above HRC36.

[0019] The utility model is convenient to use, has stable quality and accurate positioning, and the hardness of the supporting wheel body after heat treatment meets the requirements, thereby reducing the difficulty of heat treatment.

[0020] The inner hole water spray core shaft of the utility model is guided by steel bars on all sides, which mainly solves the problem that when the manipulator grabs the supporting roller and the loading platform is lowered or raised, the oil cavity of the supporting roller body often gets stuck with the boss of the original inner hole core shaft due to the shaking of the workpiece or the inaccurate position. When the device of the utility model is used, the supporting roller is lifted and lowered without getting stuck on the tooling.

[0021] In addition, the large boss of the original tooling also prevented the cooling water from being directly sprayed onto the surface of the inner hole of the workpiece, and also prevented the cooling water from flowing on the surface of the workpiece, resulting in the low hardness of the part where the boss contacts the supporting roller, only HRC30-35, which does not meet the technical requirements of HRC36 or above, and the product's use strength is also affected. After using the utility model, the surface hardness of the inner hole has been significantly improved, the hardness of the entire inner diameter surface is basically the same, and the use strength of the product strength has been significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure of the track wheel body.

[0023] Figure 2 The utility model is a schematic diagram of the structure of an inner hole water spray core shaft.

[0024] Figure 3 for Figure 2 Middle AA section view.

[0025] Figure 4 Schematic diagram of heat treatment of the track roller body.

[0026] Figure numerals: 1- spindle body, 2- water inlet channel, 3- blocking plate, 4- annular support plate, 5- guide column, 6- loading platform, 7- tray. DETAILED DESCRIPTION

[0027] The utility model discloses an inner hole water spraying mandrel, comprising a mandrel body 1, wherein a water inlet channel 2 penetrating the mandrel body 1 is arranged at the center of the mandrel body 1, one end of the water inlet channel 2 is blocked by a blocking plate 3 fixedly connected to the mandrel body 1, and the other end extends out of the mandrel body 1 and is connected to an external water inlet device;

[0028] The two ends and the middle of the mandrel body 1 are fixedly sleeved with an annular support plate 4; the annular support plate 4 is fixedly connected through a plurality of guide devices;

[0029] The mandrel body 1 is evenly distributed with water spray holes on its circumference;

[0030] A chamfer is provided at the edge of the annular support plate 4 on one end of the core shaft body 1 away from the water inlet device; the chamfer is provided on a side away from the annular support plate 4 located in the middle of the core shaft body 1 .

[0031] The guide device is a guide column 5, one end of which is fixedly connected to the annular support plate 4 on one end of the mandrel body 1, and the other end passes through the annular support plate 4 located in the middle of the mandrel body 1 and is fixedly connected to the annular support plate 4 on the other end of the mandrel body 1;

[0032] The central axis of the guide column 5 is parallel to the central axis of the spindle body 1 and is parallel to each other.

[0033] The annular support plate 4 and the core shaft body 1 are fixedly connected by welding.

[0034] There are four guide posts 5 , and the four guide posts 5 are evenly distributed along the circumference of the core shaft body 1 .

[0035] A method for heat treatment of the inner hole of a supporting wheel body, using an inner hole water spraying mandrel to heat treat the inner hole of the supporting wheel body, the method comprising the following steps:

[0036] Step 1: Heating: Use a roller bottom continuous heating furnace to heat the roller body at a temperature of 840±10℃ for 3 hours, and then automatically take it out of the furnace to the designated position;

[0037] Step 2: quenching. The production process of the fully automatic quenching machine is as follows: after the roller body is heated, the manipulator grabs the supporting wheel body and puts it on the cooling tooling at the cooling station. The cooling tooling includes a tray 7, and the tray is fixedly arranged on the loading platform 6. An inner-hole water-spraying mandrel vertically passes through the tray 7 and is fixedly connected to the loading platform 6. After the water inlet pipe passes through the loading platform 6, it is connected to one end of the water inlet channel 2 on the mandrel body 1. The roller body is sleeved on an inner-hole water-spraying mandrel from one end of the mandrel body 1 with a chamfer. Under the action of the guide device, the roller body is smoothly sleeved on an inner-hole water-spraying mandrel, and the roller body is One end of the roller body is connected to the tray 7, and then the loading platform 6 drives the roller body to rotate 90 degrees, so that the roller body is in a horizontal state, and the cylinder clamping mechanism drives the peripheral water spraying ring to clamp the roller body, and the loading platform 6 drives the workpiece to rotate, and the peripheral water spraying ring and an inner hole water spraying core shaft start to spray water toward the roller body. After the water spraying is completed, the inner hole water spraying core shaft and the peripheral water spraying ring stop spraying water respectively, and the cylinder clamping mechanism drives the peripheral water spraying ring to return to the initial position, and the loading platform 6 flips back to the initial position, and the manipulator descends to grab the roller body and rises, and the manipulator moves the roller body to the specified position for tempering;

[0038] Process parameters include: peripheral water spray time 240±10s, inner hole water spray delay 170±10s, water spray time 20±5s, peripheral water spray flow 22±1m 3 / h, inner hole water spray flow rate 7±1m 3 / h;

[0039] Step 3: Tempering, using a roller bottom continuous heating furnace, at a temperature of 200±10℃, heating for 2 hours, automatically taking the product out of the furnace to the designated location, completing the heat treatment process;

[0040] Step 4: Self-check: Confirm the quenching surface hardness and tempering surface hardness of the roller body;

[0041] Step 5: Special inspection: Cut the roller body with wire cutting, take a cross section to check the outer surface hardness and hardened layer depth of the roller body, the surface hardness and hardened layer depth of the inner hole, and the hardness of the inner diameter surface is required to be above HRC36.

[0042] The utility model is convenient to use, has stable quality and accurate positioning, and the hardness of the supporting wheel body after heat treatment meets the requirements, thereby reducing the difficulty of heat treatment.

[0043] The inner hole water spray core shaft of the utility model is guided by steel bars all around, which mainly solves the problem that when the manipulator grabs the supporting roller and the loading platform 6 descends or ascends, the oil cavity of the supporting roller body often gets stuck with the boss of the original inner hole core shaft due to the shaking of the workpiece or the inaccurate position. When the device of the utility model is used, the supporting roller is lifted and lowered without getting stuck on the tooling.

[0044] In addition, the large boss of the original tooling also prevented the cooling water from being directly sprayed onto the surface of the inner hole of the workpiece, and also prevented the cooling water from flowing on the surface of the workpiece, resulting in the low hardness of the part where the boss contacts the supporting roller, only HRC30-35, which does not meet the technical requirements of HRC36 or above, and the product's use strength is also affected. After using the utility model, the surface hardness of the inner hole has been significantly improved, the hardness of the entire inner diameter surface is basically the same, and the use strength of the product strength has been significantly improved.

Claims

1. An inner hole water spray core shaft, comprising a core shaft body, characterized in that: A water inlet channel penetrating the core shaft body is provided at the center of the core shaft body, one end of the water inlet channel is blocked by a blocking plate fixedly connected to the core shaft body, and the other end extends out of the core shaft body and is connected to an external water inlet device; Both ends and the middle of the mandrel body are fixedly sleeved with annular support plates; the annular support plates are fixedly connected through a plurality of guide devices; Water spray holes are evenly distributed on the circumference of the mandrel body; A chamfer is arranged at the edge of the annular support plate on the end of the core shaft body away from the water inlet device; the chamfer is arranged on the side away from the annular support plate located in the middle of the core shaft body.

2. An inner hole water spray core shaft as claimed in claim 1, characterized in that: The guide device is a guide column, one end of which is fixedly connected to the annular support plate on one end of the mandrel body, and the other end passes through the annular support plate located in the middle of the mandrel body and is fixedly connected to the annular support plate on the other end of the mandrel body; The central axis of the guide column is parallel to the central axis of the core shaft body and is parallel to each other.

3. An inner hole water spray core shaft as claimed in claim 2, characterized in that: The annular support plate and the core shaft body are fixedly connected by welding.

4. An inner hole water spray core shaft as claimed in claim 3, characterized in that: The number of guide posts is four, and the four guide posts are evenly distributed along the circumference of the core shaft body.

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