Die steel tufftriding heat treatment device

Abstract

The utility model relates to a tufftriding heat treatment device for die steel. The tufftriding heat treatment device comprises a surface treatment chamber, a nitriding furnace and a vacuum quenching furnace which are sequentially distributed, the surface treatment chamber comprises a treatment chamber main body, the treatment chamber main body is provided with a treatment inner cavity, a placing platform for placing a die steel workpiece is arranged in the treatment chamber main body, and the placing platform is driven by a lifting mechanism to lift up and down; clamping assemblies used for clamping and rotating the die steel workpiece are further arranged on the two sides of the containing platform. And an ultrasonic shot blasting machine is arranged above the treatment chamber main body. According to the heat treatment device disclosed by the utility model, the surface treatment chamber, the ultrasonic shot blasting machine, the nitriding furnace, the vacuum quenching furnace and other parts are matched with one another, and a catalytic protection layer is formed on the surface of the die steel workpiece in advance in a sand blasting manner, so that the subsequent nitriding efficiency is effectively improved, and the carburizing temperature is reduced; the influence of traditional high-temperature nitriding on the performance of the die steel is avoided, and the hardness and impact resistance of the surface of the die steel subjected to tufftriding are greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the die steel processing field, especially a die steel soft nitriding heat treatment device. BACKGROUND

[0002] Die steel is used to manufacture cold punch die, hot forging die, die casting die and the like steel grade. The die is the main processing tool of the parts in the industrial department such as machinery manufacturing, wireless radio instrument, motor, electric appliance and the like. Generally, when die steel is processed, in order to ensure the physicochemical performance of die steel in use, the surface of die steel is often subjected to soft nitriding heat treatment.

[0003] At present, when the traditional die steel is subjected to soft nitriding heat treatment, the traditional spheroidizing annealing, quenching and tempering are mainly used to carry out nitriding processing. The soft nitriding mode is used on one hand, the soft nitriding temperature is high, which can easily affect the physicochemical performance of the surface of die steel, cause the deformation of die steel, on the other hand, the high nitriding temperature increases the difficulty of soft nitriding process, and at the same time, the nitriding rate is relatively low, which greatly reduces the hardness and impact resistance of the surface of die steel. UTILITY MODEL CONTENT

[0004] The technical problem to be solved by the utility model is to provide a die steel soft nitriding heat treatment device capable of improving the hardness and impact resistance of the surface of die steel.

[0005] In order to solve the above technical problem, the technical scheme of the utility model is as follows: a die steel soft nitriding heat treatment device, the innovation point of which is that the device comprises a surface treatment chamber, a nitriding furnace and a vacuum quenching furnace which are sequentially distributed.

[0006] The surface treatment chamber comprises a treatment chamber main body, the treatment chamber main body has a treatment inner cavity, a placing platform for placing die steel workpieces is arranged in the treatment chamber main body, the placing platform is driven to ascend and descend by a lifting mechanism, and clamping assemblies for clamping and rotating the die steel workpieces are arranged on both sides of the placing platform.

[0007] An ultrasonic shot blasting machine is arranged above the treatment chamber main body, and a shot blasting opening is formed in the upper side of the treatment chamber main body and is communicated with the treatment inner cavity.

[0008] A rare earth feeding opening is further formed in the nitriding furnace.

[0009] Robots for the turnover of die steel workpieces are further arranged between the treatment chamber main body and the nitriding furnace and between the nitriding furnace and the vacuum quenching furnace.

[0010] Further, the lifting mechanism comprises a lifting cylinder, the top end of the lifting cylinder is connected with the bottom end of the placing platform, and the placing platform is driven to lift up and down, and a guide sleeve is further arranged at the bottom end of the placing platform.

[0011] Further, the clamping assembly comprises a pair of clamping plates distributed on both sides of the placing platform, and the two clamping plates are respectively driven to rotate by independent motors, the motor is driven by a horizontal cylinder mounted on the processing chamber body to approach or move away from the placing platform, thereby driving the clamping plate to approach or move away from the placing platform.

[0012] Further, the horizontal cylinder is mounted on the outside of the processing chamber body, a through hole for the piston rod of the horizontal cylinder and the motor to pass through and move is formed in the side wall of the processing chamber body, the through hole is in T shape, and the clamping plate is a T-shaped plate matched with the through hole.

[0013] The heat treatment device in the utility model, through the mutual cooperation of the surface treatment chamber, the ultrasonic shot blasting machine, the nitriding furnace and the vacuum quenching furnace and other components, a catalytic protective layer is formed on the surface of the die steel workpiece in advance through the sand blasting mode, the efficiency of subsequent nitriding is effectively improved, the temperature of carburizing is reduced, the influence of traditional high-temperature nitriding on the performance of the die steel is avoided, and the hardness and impact resistance of the die steel surface after soft nitriding are greatly improved.

[0014] For the design of the clamping assembly and the lifting mechanism, the placing platform is lifted up and down and the die steel workpiece is rotated, so that the ultrasonic shot blasting machine is matched, each surface of the die steel workpiece is well sprayed and coated, and a good foundation is provided for subsequent soft nitriding treatment of the die steel.

[0015] And the through hole in the side wall of the processing chamber body is designed in T shape, and the T-shaped clamping plate is matched, so that the clamping plate can be retracted in the side wall of the processing chamber body in the sand blasting process, the clamping plate is protected, and the surface of the clamping plate is also sprayed to affect the clamping of the die steel. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic view of the die steel soft nitriding heat treatment device of the utility model. DETAILED DESCRIPTION

[0017] In order to further illustrate the technical means and effects adopted by the utility model to achieve the predetermined utility model purposes, the specific implementation, structure, features and effects of the utility model will be described in detail as follows in combination with the drawings and preferred embodiments.

[0018] As Figure 1The device for soft nitriding heat treatment of die steel comprises a surface treatment chamber, a nitriding furnace 2 and a vacuum quenching furnace 3 arranged in sequence.

[0019] The surface treatment chamber comprises a treatment chamber body 1 which is a hollow cuboid structure and has a treatment inner cavity. A placing platform 11 for placing die steel workpieces is arranged in the treatment chamber body 1 and has a rectangular shape. The placing platform 11 is driven to move up and down by a lifting mechanism which comprises a lifting cylinder 16. The top end of the lifting cylinder 16 is connected to the bottom end of the placing platform 11 and drives the placing platform 11 to move up and down. Four guide sleeves are arranged at the four corners of the bottom end of the placing platform 11. Each guide sleeve is composed of an upper sleeve 18 and a lower sleeve 17 arranged in sequence. The top end of the upper sleeve 18 is directly fixed to the bottom end of the placing platform 11. A guide groove is formed in the lower side of the upper sleeve 18 to allow the lower sleeve 17 to extend into and move up and down. The top end of the lower sleeve 17 extends into the guide groove of the upper sleeve 18. The cooperation of the upper sleeve 18 and the lower sleeve 17 can guide and limit the stroke of the placing platform 11 when the placing platform 11 moves up and down, thereby avoiding the deviation of the placing platform 11.

[0020] A clamping assembly for clamping and rotating the die steel workpieces is arranged on both sides of the placing platform 11. The clamping assembly comprises a pair of clamping plates 12 arranged on both sides of the placing platform 11. The two clamping plates 12 are respectively driven to rotate by independent motors 13. The motors 13 are driven by a horizontal cylinder 14 mounted on the treatment chamber body 1 to move close to or away from the placing platform 11, thereby driving the clamping plates 12 to move close to or away from the placing platform 11.

[0021] The horizontal cylinder 14 is mounted on the outside of the treatment chamber body 1 through the cooperation of a mounting bracket. A through hole 15 is formed in the side wall of the treatment chamber body 1 to allow the piston rod of the horizontal cylinder 14 and the motor 13 to extend through and move. The through hole 15 has a T shape. The clamping plate 12 is a T-shaped plate matched with the through hole 15. The through hole in the side wall of the treatment chamber body 1 has a T shape. The clamping plate 12 is a T-shaped plate. During the sandblasting process, the clamping plate 12 can be retracted into the side wall of the treatment chamber body 1, thereby protecting the clamping plate 12 and avoiding the surface of the clamping plate 12 being sandblasted to affect the subsequent clamping of the die steel. The design of the T-shaped through hole 15 and the T-shaped clamping plate 12 facilitates the retraction of the clamping plate 12 into the side wall of the treatment chamber body 1.

[0022] For the design of the clamping assembly and the lifting mechanism, the up and down movement of the placing platform and the rotation of the mold steel workpiece are realized to cooperate with the ultrasonic shot blasting machine, and the surfaces of the mold steel workpiece are well covered by the sand blasting, which provides a good foundation for the subsequent soft nitriding treatment of the mold steel. When the mold steel workpiece needs to be turned over during actual processing, first, the two clamping plates 12 are driven by the respective horizontal cylinders 14 to approach the two sides of the mold steel workpiece, and the mold steel workpiece is clamped by the clamping plates 12. After clamping, the placing platform 11 is driven downward by the lifting cylinder 16 to separate the mold steel workpiece from the placing platform 11. Then, the clamping plates 12 are driven to rotate by the motors, respectively, to drive the mold steel workpiece to rotate. After the rotation is completed, the placing platform 11 is driven upward by the lifting cylinder 16 to support the mold steel workpiece. Finally, the clamping plates 12 are driven away from the mold steel workpiece by the horizontal cylinders 14 to turn over the mold steel workpiece.

[0023] An ultrasonic shot blasting machine is arranged above the processing chamber body 1, and a shot blasting opening is formed in the upper side of the processing chamber body 1 to communicate with the processing cavity.

[0024] A rare earth feeding opening 21 is further formed in the nitriding furnace 2.

[0025] Robots for the turnover of the mold steel workpiece are further arranged between the processing chamber body 1 and the nitriding furnace 2 and between the nitriding furnace 2 and the vacuum quenching furnace 3, respectively, to grasp and send the mold steel workpiece from the processing chamber body 1 into the nitriding furnace 2 or to grasp and send the mold steel workpiece from the nitriding furnace 2 into the vacuum quenching furnace 3.

[0026] Working principle: first, the mold steel workpiece to be processed is placed on the placing platform 11, and then the surface of the mold steel workpiece is treated by sand blasting using the ultrasonic shot blasting machine to form a nanocrystalline layer as a catalytic protective layer. Then, the processed mold steel workpiece is placed in the nitriding furnace 2, and before nitriding treatment, rare earth is added into the nitriding furnace 2 from the rare earth feeding opening 21. Then, the nitriding furnace 2 is heated to perform carburizing treatment on the mold steel workpiece. The catalytic protective layer and the rare earth cooperate to accelerate the nitriding rate of the mold steel workpiece, shorten the nitriding time of the mold steel workpiece, and reduce the nitriding temperature. After carburizing, the mold steel workpiece is sent to the vacuum quenching furnace 3 for quenching and low-temperature tempering treatment in sequence to complete the soft nitriding heat treatment of the mold steel workpiece.

[0027] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make minor changes or modifications to the disclosed technical content, or make equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, equivalent change or modification of the above embodiments, which does not depart from the technical solution of the present application, is still within the scope of the technical solution of the present application.

Claims

1. A mold steel soft-nitriding heat treatment apparatus, characterized by: The surface treatment chamber, the nitriding furnace and the vacuum quenching furnace are arranged in sequence. The surface treatment chamber comprises a treatment chamber body with a treatment inner cavity, and a placing platform for placing the die steel workpiece is arranged in the treatment chamber body. An ultrasonic shot blasting machine is arranged above the treatment chamber body, and a shot blasting opening is formed in the upper side of the treatment chamber body and communicated with the treatment inner cavity. A rare earth feeding opening is formed in the nitriding furnace. Robots for the turnover of the die steel workpieces are arranged between the treatment chamber body and the nitriding furnace and between the nitriding furnace and the vacuum quenching furnace.

2. The mold steel soft nitriding heat treatment apparatus according to claim 1, characterized by: The lifting mechanism comprises a lifting cylinder, the top end of which is connected with the bottom end of the placing platform and drives the placing platform to lift up and down.

3. The mold steel soft nitriding heat treatment apparatus according to claim 1, characterized by: The clamping assembly comprises a pair of clamping plates arranged on the two sides of the placing platform, and the two clamping plates are respectively driven to rotate by independent motors.

4. The mold steel soft nitriding heat treatment apparatus according to claim 3, characterized by: The motors are driven by a horizontal cylinder mounted on the treatment chamber body to approach or move away from the placing platform, thereby driving the clamping plates to approach or move away from the placing platform. The horizontal cylinder is mounted on the outside of the treatment chamber body, and a through hole is formed in the side wall of the treatment chamber body and through which the piston rod of the horizontal cylinder and the motor can move. The through hole is in the shape of T, and the clamping plate is a T-shaped plate matched with the through hole.

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