Local high-frequency annealing device for high-strength rivet nuts

Abstract

The utility model relates to the technical field of nut production, and particularly discloses a local high-frequency annealing device for a high-strength rivet nut, which comprises a base, a high-frequency electromagnetic coil fixedly mounted on the base and used for heating, and a limiting sleeve fixedly mounted on the base and used for supporting, rotating connecting rods used for clamping are evenly and rotatably installed on the limiting sleeve, sliding connecting rods used for clamping are rotatably installed at the tail ends of the rotating connecting rods, a threaded rod used for driving is rotatably installed on the limiting sleeve, and a lifting threaded sleeve used for transmission is installed on the threaded rod in a threaded mode; a knob for bearing force is fixedly mounted at the bottom end of the threaded rod; the position of the nut can be adjusted, it is ensured that threads of the nut are not within the range covered by the high-frequency electromagnetic coil, the nut is heated and heated to complete annealing, the effect that only the local part of the nut is annealed is achieved, the heating speed is high, thermal stress and thermal deformation can be reduced, and the overall performance of a product can be protected.

Description

TECHNICAL FIELD

[0001] The utility model relates to nut production technical field, especially high strength local high -frequency annealing device for rivet nut. BACKGROUND

[0002] Rivet nut, also known as rivet nut, is currently used in the fastening field of various metal sheet, pipe and other manufacturing industries, in order to solve the problems of easy melting of metal sheet, thin pipe welding nut, easy deformation of base material welding, easy tooth slipping of tapping internal thread, etc., it does not need to tap internal thread, and does not need to weld nut, riveting is firm, efficient and convenient to use, and is widely used in the assembly of automobile, aviation, railway, refrigeration, elevator, switch, instrument, furniture, decoration and other electromechanical and light products.

[0003] The production process of rivet nut retains the quenching step, the semi-finished rivet nut after cold heading is quenched and tempered, the overall hardness and hardness stability are improved, and the internal stress generated during tempering is eliminated, which is beneficial to tapping, and then only the riveting area is annealed, and then it is naturally cooled, so that the formed thread has the characteristics of high strength (more than 10 levels).

[0004] But in the implementation process of the above technical scheme, it is found that at least the following technical problems exist: the thread area does not need to be high-frequency annealed, so that it still maintains the hardness after quenching and tempering, thereby ensuring that the rivet action is not affected. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies of the prior art, the utility model provides a local high-frequency annealing device for high-strength rivet nut, which solves the technical problem that the thread area does not need to be high-frequency annealed, so that it still maintains the hardness after quenching and tempering, thereby ensuring that the rivet action is not affected.

[0006] To achieve the above purpose, the utility model realizes the following technical scheme:

[0007] The local high-frequency annealing device for high-strength rivet nut comprises a base, a high-frequency electromagnetic coil for heating is fixedly installed on the base, a limiting sleeve for supporting is fixedly installed on the base, rotating connecting rods for clamping are uniformly and rotatably installed on the limiting sleeve, sliding connecting rods for clamping are rotatably installed at the ends of the rotating connecting rods, a threaded rod for driving is rotatably installed on the limiting sleeve, a lifting threaded sleeve for transmission is threadedly installed on the threaded rod, and a knob for force receiving is fixedly installed at the bottom end of the threaded rod.

[0008] Preferably, the four sliding connecting rods are in sliding connection with the limiting sleeve.

[0009] Preferably, the four sliding connecting rods are in rotating connection with the lifting threaded sleeve.

[0010] Preferably: the base and the limiting sleeve are both made of alumina ceramic material.

[0011] Preferably: the rotating connecting rod and the sliding connecting rod are both made of zirconia ceramic material.

[0012] Preferably: the lifting threaded sleeve and the threaded rod are both made of silicon nitride ceramic material.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] I. The nut is sleeved on the limiting sleeve, then the knob is rotated, the knob drives the threaded rod to rotate clockwise, the threaded rod pushes the lifting threaded sleeve to slide upwards, the lifting threaded sleeve makes the bottom end of the sliding connecting rod slide upwards, the top end of the sliding connecting rod drives the bottom end of the rotating connecting rod to expand outward at the same time, until the fixing is completed against the inner side wall of the nut, in this process, the position of the nut can be adjusted, the threads of the nut are ensured not to be in the range covered by the high-frequency electromagnetic coil, when the alternating current passes through the high-frequency electromagnetic coil, an alternating magnetic field is generated, when the nut is placed in the alternating magnetic field, the nut itself heats and warms up to complete annealing, the effect that only the local part of the nut is annealed is reached, the heating speed is relatively fast, the thermal stress and thermal deformation can be reduced, and the overall performance of the product can be protected.

[0015] II. The base and the limiting sleeve are both made of alumina ceramic material, the manufacturing cost is relatively low, the rotating connecting rod and the sliding connecting rod are both made of zirconia ceramic material, the heat conduction performance is also poor, therefore the high temperature generated by the nut can be avoided to be transferred to other areas, the lifting threaded sleeve and the threaded rod are both made of silicon nitride ceramic material, the hardness and the strength are relatively high, the abrasion between the two can be reduced during use, the service life is increased, according to the use requirement, the effect that the service life is prolonged is reached under the condition that the use cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, and can be implemented according to the content of the specification, the following preferably the embodiment of the utility model and cooperate with the drawings are described in detail as follows.

[0017] Figure 1 It is the high-frequency electromagnetic coil structure diagram of the utility model;

[0018] Figure 2 It is the limiting sleeve structure diagram of the utility model;

[0019] Figure 3 It is the base cross-sectional structure diagram of the utility model;

[0020] Figure 4 It is the sliding connecting rod structure diagram of the utility model.

[0021] Legend: 1, base; 2, high-frequency electromagnetic coil; 3, limiting sleeve; 4, rotating connecting rod; 5, sliding connecting rod; 6, lifting threaded sleeve; 7, threaded rod; 8, knob. DETAILED DESCRIPTION

[0022] The technical problem of effectively solving the technical problem that the threaded area does not need to be high-frequency annealed, so as to still maintain the hardness after quenching and tempering, thereby ensuring that the pull riveting action is not affected, is solved by providing a local high-frequency annealing device for high-strength pull rivet nuts. The nut is sleeved on the limiting sleeve, and then the knob is rotated to drive the threaded rod to rotate clockwise. The threaded rod will push the lifting threaded sleeve to slide upwards. The lifting threaded sleeve will make the bottom end of the sliding connecting rod slide upwards. The top end of the sliding connecting rod will drive the bottom end of the rotating connecting rod to expand outward at the same time until it is fixed against the inner side wall of the nut. In this process, the position of the nut can be adjusted to ensure that the threads of the nut are not within the range covered by the high-frequency electromagnetic coil. When alternating current passes through the high-frequency electromagnetic coil, an alternating magnetic field is generated. When the nut is placed in this alternating magnetic field, the nut itself heats up to complete annealing. The effect of annealing only the local part of the nut is achieved, and the heating speed is relatively fast, which can reduce thermal stress and thermal deformation to protect the overall performance of the product. The base and the limiting sleeve are made of alumina ceramic material, which has a relatively low cost. The rotating connecting rod and the sliding connecting rod are made of zirconia ceramic material, and the rotating connecting rod and the sliding connecting rod are made of zirconia ceramic material, which has poor heat conduction performance. Therefore, the high temperature generated by the nut can be prevented from being transferred to other areas. The lifting threaded sleeve and the threaded rod are made of silicon nitride ceramic material, which has high hardness and strength, and can reduce wear and tear between the two during use, thereby increasing the service life. According to the use requirements, the use cost is reduced, and the effect of prolonging the service life is achieved.

[0023] EMBODIMENT

[0024] As shown in Figure 1 , Figure 2 , Figure 3 and Figure 4 , the technical solution in the embodiment of the application effectively solves the technical problem that the threaded area does not need to be high-frequency annealed, so as to still maintain the hardness after quenching and tempering, thereby ensuring that the pull riveting action is not affected. The overall idea is as follows:

[0025] In view of the problems in the prior art, the utility model provides a local high-frequency annealing device for high-strength pull rivet nuts, which comprises a base 1, a high-frequency electromagnetic coil 2 for heating is fixedly installed on the base 1, a limiting sleeve 3 for supporting is fixedly installed on the base 1, rotating connecting rods 4 for clamping are uniformly and rotatably installed on the limiting sleeve 3, and sliding connecting rods 5 for clamping are rotatably installed at the ends of the rotating connecting rods 4.

[0026] The limiting sleeve 3 is rotatably installed with a threaded rod 7 for driving, the threaded rod 7 is threadedly installed with a lifting threaded sleeve 6 for transmission, the bottom end of the threaded rod 7 is fixedly installed with a knob 8 for force receiving, and the four sliding connecting rods 5 are all in sliding connection with the limiting sleeve 3.

[0027] The four sliding connecting rods 5 are all in rotary connection with the lifting threaded sleeve 6, the base 1 and the limiting sleeve 3 are both made of alumina ceramic material, the rotary connecting rod 4 and the sliding connecting rod 5 are both made of zirconia ceramic material, and the lifting threaded sleeve 6 and the threaded rod 7 are both made of silicon nitride ceramic material.

[0028] The base 1 mainly plays a role of support and basic structure, is made of alumina ceramic material, cannot be heated by the high-frequency electromagnetic coil 2, and has a relatively low manufacturing cost.

[0029] The high-frequency electromagnetic coil 2 is used for heating, generates an alternating magnetic field when an alternating current passes through, causes eddy current in the nut to heat and warm up, and realizes annealing.

[0030] The limiting sleeve 3 is used for supporting and clamping components, is made of alumina ceramic material, cannot be heated by the high-frequency electromagnetic coil 2, and has a relatively low manufacturing cost.

[0031] The rotary connecting rod 4 and the sliding connecting rod 5 are combined into a clamping structure, can fix the position of the nut from the inner side wall of the nut, are made of zirconia ceramic material, and can avoid high temperature generated by the nut from being transmitted to other components.

[0032] The lifting threaded sleeve 6 and the threaded rod 7 constitute a driving structure, are used for controlling the position of the rotary connecting rod 4 and the sliding connecting rod 5, are made of silicon nitride ceramic material, can reduce abrasion, and prolong service life.

[0033] The knob 8 rotates to drive the threaded rod 7 to rotate, thereby starting the operation process of the fixed nut.

[0034] Working principle:

[0035] In the first step, in use, the nut is sleeved on the limiting sleeve 3, and then the knob 8 is rotated to drive the threaded rod 7 to rotate clockwise, since the threaded rod 7 is in threaded connection with the lifting threaded sleeve 6, the threaded rod 7 will push the lifting threaded sleeve 6 to slide upward, the lifting threaded sleeve 6 will make the bottom end of the sliding connecting rod 5 slide upward, the top end of the sliding connecting rod 5 will drive the bottom end of the rotary connecting rod 4 to expand outward at the same time until abutting against the inner side wall of the nut to complete fixing, in this process, the position of the nut can be adjusted to ensure that the threads of the nut are not in the range covered by the high-frequency electromagnetic coil 2.

[0036] Secondly, the two ends of the high-frequency electromagnetic coil 2 are connected with the adjustable frequency power supply device, when the alternating current passes through the high-frequency electromagnetic coil 2, an alternating magnetic field is generated, when the nut is placed in the alternating magnetic field, an induced electromotive force is generated in the nut, thereby forming a closed loop current, the current is called eddy current, when the eddy current flows in the nut, the eddy current meets resistance, the current passing through the resistance generates Joule heat, thereby the nut itself is heated and warmed to complete annealing, since the magnetic permeability of the base 1, the limiting sleeve 3, the rotating connecting rod 4, the sliding connecting rod 5, the lifting threaded sleeve 6 and the threaded rod 7 is low, therefore the base 1, the limiting sleeve 3, the rotating connecting rod 4, the sliding connecting rod 5, the lifting threaded sleeve 6 and the threaded rod 7 are not heated by the electromagnetic coil, and the rotating connecting rod 4 and the sliding connecting rod 5 are made of zirconia ceramic material, and the heat conduction performance is also poor, therefore the high temperature generated by the nut can be avoided from being transmitted to other areas, and the lifting threaded sleeve 6 and the threaded rod 7 are made of silicon nitride ceramic material, and the hardness and strength are high, thereby the abrasion between the lifting threaded sleeve 6 and the threaded rod 7 can be reduced during use, and the service life is increased.

[0037] Finally, it should be noted that: Obviously, the above examples are only examples for clearly illustrating the utility model, and are not limited to the implementation. For ordinary skilled in the art, on the basis of the above description, other different forms of changes or variations can be made. Here, all the implementation ways do not need to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the utility model.

Claims

1. A local high-frequency annealing device for high-strength pull-rivet nuts, comprising a base (1), characterized in that, The base (1) is fixedly installed with a high-frequency electromagnetic coil (2) for heating, and is fixedly installed with a limiting sleeve (3) for supporting, and the limiting sleeve (3) is uniformly rotatably installed with rotating connecting rods (4) for clamping, and the end of the rotating connecting rod (4) is rotatably installed with a sliding connecting rod (5) for clamping, and the limiting sleeve (3) is rotatably installed with a threaded rod (7) for driving, and the threaded rod (7) is threadedly installed with a lifting threaded sleeve (6) for transmission, and the bottom end of the threaded rod (7) is fixedly installed with a knob (8) for force receiving.

2. The local high-frequency annealing device for high-strength pull-rivet nuts according to claim 1, wherein Four sliding connecting rods (5) are in sliding connection with the limiting sleeve (3).

3. The local high-frequency annealing device for high-strength pull-up nuts according to claim 1, wherein Four sliding connecting rods (5) are in rotating connection with the lifting threaded sleeve (6).

4. The local high-frequency annealing device for high-strength pull-up nuts according to claim 1, wherein The base (1) and the limiting sleeve (3) are both made of alumina ceramic material.

5. The local high-frequency annealing device for high-strength pull-up nuts according to claim 1, wherein The rotating connecting rod (4) and the sliding connecting rod (5) are both made of zirconia ceramic material.

6. The local high-frequency annealing device for high-strength pull-up nuts according to claim 1, wherein The lifting threaded sleeve (6) and the threaded rod (7) are both made of silicon nitride ceramic material.

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