Steering gear rack surface high-frequency induction heat treatment device

Abstract

This invention discloses a high-frequency induction heat treatment device for the tooth surface of a steering gear rack, comprising an insulating base, a lower electrode plate, an upper electrode plate, a left electrode, a right electrode, and a water spray box. The lower electrode plate is fixedly mounted on the top of the insulating base, the upper electrode plate is disposed on the lower electrode plate, the left electrode is fixedly mounted on the right side of the top of the upper electrode plate, and both the right electrode and the water spray box are fixedly mounted on the lower electrode plate. The water spray box is located between the left and right electrodes, and a middle block is fixedly disposed at the center of the top of the water spray box. Multiple water spray holes are formed on the top of the water spray box and the middle block. This invention ensures that the dimensional change of the teeth on both sides of the automotive steering gear rack during quenching and heating is the same as the dimensional change of the teeth in the middle of the rack, thus improving the quenching effect.

Description

Technical Field

[0001] This utility model relates to the technical field of automotive parts, and in particular to a high-frequency induction heat treatment device for the tooth surface of a steering gear rack. Background Technology

[0002] The steering rack of an automobile is a slender rod. With the increasing sophistication of automotive steering systems, higher requirements are being placed on the tooth profile of the rack. The heat treatment methods for automotive steering racks include electric current conduction heating and induction magnetic field heating.

[0003] Traditional heat treatment equipment heats the teeth on both sides of the rack first, resulting in a temperature on the sides of the rack that is much higher than that on the middle teeth before final cooling. When the rack deforms due to a decrease in yield strength at high temperatures, the dimensional change of the teeth on both sides is greater than that of the middle teeth, which may reduce the quenching effect of the automotive steering rack. Utility Model Content

[0004] The present invention aims to provide a high-frequency induction heat treatment device for the tooth surface of a steering gear rack, so as to ensure that the dimensional change of the tooth profile on both sides is the same as that of the tooth profile in the middle during the quenching and heating of the automotive steering gear rack, thereby improving the quenching effect.

[0005] Therefore, the technical solution adopted by this utility model is as follows: a high-frequency induction heat treatment device for the tooth surface of a steering gear rack, comprising an insulating base, a lower electrode plate, an upper electrode plate, a left electrode, a right electrode, and a water spray box. The lower electrode plate is fixedly installed on the top of the insulating base, the upper electrode plate is disposed on the lower electrode plate, the left electrode is fixedly installed on the right side of the top of the upper electrode plate, and the right electrode and the water spray box are both fixedly installed on the lower electrode plate. The water spray box is located between the left electrode and the right electrode, and a middle block is fixedly disposed in the middle of the top of the water spray box. Multiple water spray holes are opened on the top of the water spray box and the middle block.

[0006] As a preferred embodiment of the above solution, both the water spray box and the intermediate block are made of copper, and the height of the intermediate block is 1mm.

[0007] More preferably, the top surfaces of the left and right electrodes are at the same height.

[0008] More preferably, an insulating plate is fixedly installed at the top of the lower electrode plate, and the upper electrode plate is fixedly installed at the top of the insulating plate.

[0009] More preferably, an external threaded double pair of wires is fixedly installed on the side end of the insulating base, and a liquid inlet channel is provided. The external threaded double pair of wires is fixedly connected to a male connector. A liquid outlet channel is provided on the lower electrode plate. The liquid inlet channel is connected to the liquid outlet channel and the external threaded double pair of wires.

[0010] A further preferred embodiment includes a baffle plate. Two mounting bolts are threadedly connected to the lower electrode plate, and mounting nuts are threadedly connected to the mounting bolts. The baffle plate is sleeved on the screws of the two mounting bolts and abuts against the heads of the mounting bolts and the mounting nuts. The baffle plate, mounting bolts, and mounting nuts are all located inside the water spray box, and the baffle plate is located above the liquid outlet channel.

[0011] More preferably, the insulating base has two mounting grooves at its bottom end.

[0012] The beneficial effects of this utility model are:

[0013] 1. During the heating of the steering rack, the water spray box and the center block will induce heating of the steering rack due to the influence of the current. Since the distance between the center block and the middle tooth of the rack is smaller than the distance between the top two sides of the water spray box and the side teeth of the rack directly above it, the induced heating temperature of the middle tooth of the rack is higher than that of the side teeth of the rack. This compensates for the temperature difference between the middle tooth and the side teeth when the rack is heated by the left and right electrodes, so that the heating temperature of the side teeth and the middle tooth is the same. This makes the dimensional change of the side teeth the same as that of the middle tooth, thus improving the quenching effect of the steering rack.

[0014] 2. This utility model has a simple structure and is easy to operate. Since the heating temperature of the teeth on both sides and the middle teeth of the rack is the same, the temperature of each tooth is consistent during heating. This ensures that the thermal stress generated by each tooth during cooling during quenching is basically the same, thereby ensuring that the deformation of the span of each tooth after quenching is basically the same. This utility model is particularly suitable for quenching the tooth surface of mechanical steering racks that have special requirements for the span of the tooth profile. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 yes Figure 1 The front view.

[0017] Figure 3 yes Figure 1 Top view.

[0018] Figure 4 yes Figure 1 Side sectional view.

[0019] Figure 5 This is a schematic diagram of the water spray box in this utility model. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] like Figure 1-5 As shown, a high-frequency induction heat treatment device for the tooth surface of a steering gear rack 5 includes an insulating base 1, a lower electrode plate 2, an upper electrode plate 4, a left electrode 6, a right electrode 7, and a water spray box 9. The lower electrode plate 2 is fixedly installed on the top of the insulating base 1, the upper electrode plate 4 is disposed on the lower electrode plate 2, the left electrode 6 is fixedly installed on the right side of the top of the upper electrode plate 4, and the right electrode 7 and the water spray box 9 are both fixedly installed on the lower electrode plate 2. The water spray box 9 is located between the left electrode 6 and the right electrode 7. A middle block 11 is fixedly disposed in the middle of the top of the water spray box 9, and multiple water spray holes 12 are opened on the top of the water spray box 9 and the middle block 11. The water spray box 9 and the middle block 11 are both made of copper, and the height of the middle block 11 is 1 mm.

[0022] When heating the steering rack 5, first place the steering rack 5 on the tops of the left electrode 6 and the right electrode 7, allowing the tops of the left electrode 6 and the right electrode 7 to insert into the outermost tooth grooves at both ends of the steering rack 5. Then, use two pneumatic cylinders from an external device to press down on the tops of the steering rack 5, ensuring full contact between the steering rack 5 and the left electrode 6 and the right electrode 7. Then, energize the device. The current will sequentially pass through the upper electrode 4, the left electrode 6, the steering rack 5, the right electrode 7, and the lower electrode 2, thus forming a current conduction heating of the steering rack 5. The current on the lower electrode 2 will pass through the water spray box 9 and the intermediate block 11. The surfaces of the water spray box 9 and the intermediate block 11 generate a ring magnetic field. The magnetic lines of force pass through the steering rack 5, generating a closed induced current, thus forming induction heating of the steering rack 5. The lower electrode 2 is fixedly mounted on the insulating base 1 with stainless steel screws.

[0023] The top surfaces of the left electrode 6 and the right electrode 7 are at the same height. An insulating plate 3 is fixedly installed on the top of the lower electrode plate 2, and the upper electrode plate 4 is fixedly installed on the top of the insulating plate 3.

[0024] The top surfaces of the left electrode 6 and the right electrode 7 are at the same height, which allows the steering rack 5 to remain horizontal when placed on the left electrode 6 and the right electrode 7, thus improving the stability of the position of the steering rack 5 when it is heated.

[0025] An external threaded double-paired wire 17 is fixedly installed on the side end of the insulating base 1, and an inlet channel 18 is provided. The external threaded double-paired wire 17 is fixedly connected to a male connector 10. An outlet channel 14 is provided on the lower electrode plate 2. The inlet channel 18 connects the outlet channel 14 and the external threaded double-paired wire 17.

[0026] The male connector 10 connects to the quenching fluid pipeline in the external heat treatment equipment. After the steering gear rack 5 is heated, the quenching fluid is transported into the male connector 10. Then, the quenching fluid enters the inlet channel 18 through the external thread double pair 17, and then enters the spray box 9 through the outlet channel 14. Then, it is sprayed onto the steering gear rack 5 through the spray hole 12 for cooling, thereby improving the hardness of the steering gear rack 5. The number of external thread double pair 17 can be 3.

[0027] It also includes a baffle 13. Two mounting bolts 16 are threadedly connected to the lower electrode plate 2. Mounting nuts 15 are threadedly connected to the mounting bolts 16. The baffle 13 is sleeved on the screws of the two mounting bolts 16 and abuts against the head of the mounting bolts 16 and the mounting nuts 15. The baffle 13, mounting bolts 16 and mounting nuts 15 are all located inside the water spray box 9. The baffle 13 is located above the liquid outlet channel 14.

[0028] The baffle 13 can block and divert the quenching liquid sprayed from the liquid outlet channel 14, allowing the quenching liquid to be sprayed more evenly from the water spray box 9. The mounting bolt 16 is threadedly connected to the lower electrode plate 2. Rotating the mounting bolt 16 can adjust the height of the head of the mounting bolt 16, thereby adjusting the height of the baffle 13.

[0029] Two mounting slots 8 are provided at the bottom of the insulating base 1.

[0030] The two mounting slots 8 facilitate the separate insertion of the two stainless steel mounting strips on the stainless steel base of the external equipment, thereby installing the insulating base 1 onto the stainless steel base.

[0031] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A high-frequency induction heat treatment device for the tooth surface of a steering gear rack, comprising an insulating base (1), a lower electrode plate (2), an upper electrode plate (4), a left electrode (6), a right electrode (7), and a water spray box (9), wherein the lower electrode plate (2) is fixedly installed on the top of the insulating base (1), the upper electrode plate (4) is disposed on the lower electrode plate (2), the left electrode (6) is fixedly installed on the right side of the top of the upper electrode plate (4), and the right electrode (7) and the water spray box (9) are both fixedly installed on the lower electrode plate (2), and the water spray box (9) is located between the left electrode (6) and the right electrode (7), characterized in that: A middle block (11) is fixedly installed at the top center of the water spray box (9), and multiple water spray holes (12) are opened on the top of the water spray box (9) and the middle block (11).

2. The steering gear rack face high frequency induction heat treatment device according to claim 1, characterized in that: The water spray box (9) and the intermediate block (11) are both made of copper, and the height of the intermediate block (11) is 1mm.

3. A device for high frequency induction heat treatment of the tooth surface of a steering gear rack (5) according to claim 1, characterized in that: The top surfaces of the left electrode (6) and the right electrode (7) are at the same height.

4. The steering gear rack face high frequency induction heat treatment device according to claim 1, characterized in that: An insulating plate (3) is fixedly installed on the top of the lower electrode plate (2), and the upper electrode plate (4) is fixedly installed on the top of the insulating plate (3).

5. The steering gear rack face high frequency induction heat treatment device according to claim 1, characterized in that: The insulating base (1) is fixedly installed with an external thread double pair of wires (17) and has an inlet channel (18). The external thread double pair of wires (17) is fixedly connected with a male connector (10). The lower electrode plate (2) has an outlet channel (14). The inlet channel (18) connects the outlet channel (14) and the external thread double pair of wires (17).

6. The device for high-frequency induction heat treatment of the tooth surface of a steering gear rack according to claim 5, characterized in that: It also includes a baffle (13), on which two mounting bolts (16) are threadedly connected, and mounting nuts (15) are threadedly connected to the mounting bolts (16). The baffle (13) is sleeved on the screws of the two mounting bolts (16) and abuts against the head of the mounting bolts (16) and the mounting nuts (15). The baffle (13), mounting bolts (16) and mounting nuts (15) are all located inside the water spray box (9). The baffle (13) is located above the liquid outlet channel (14).

7. The steering gear rack face high frequency induction heat treatment device according to claim 1, characterized in that: The insulating base (1) has two mounting grooves (8) at its bottom.

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