A preloading calibration stress high-strength bolt processing device and its processing technology

Abstract

The present invention discloses a device for processing high-strength bolts with preloading calibration stress, which includes an erection track, a sliding sleeve, a rigid plate and a movable rolling die plate. It is characterized in that: the sliding sleeve is sleeved on the outer ring of the erection track, the rigid plate is fixedly installed on the side surface of the sliding sleeve, and the movable rolling die plate is installed on the side surface of the rigid plate. The novel structure design of the rolling die plate can, on the one hand, greatly reduce the use and manufacturing costs, and on the other hand, can quickly conduct heat exchange to maintain the stability of the rolling die structure itself. A processing technology for high-strength bolts with preloading calibration stress includes the following steps: drawing and reducing diameter, blanking, heating, red upset forming, reducing diameter, thread rolling, oil quenching, air cooling, tempering, air cooling, surface treatment, packaging. The quenching temperature of the oil quenching process is 850°C, with super-cooling speed fast quenching oil, kinematic viscosity of 10, cooling speed of 105.8°C / S at 600°C, and cooling speed of 16°C at 300°C, which can avoid quenching cracks to the greatest extent and maintain the stability of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of fastener production and processing, and particularly to a device for processing high-strength bolts with preloading calibration stress and its processing technology. Background Technique

[0002] Fasteners are a type of mechanical parts used for fastening connections and are extremely widely applied. They are used in a wide range of industries, including energy, electronics, electrical appliances, machinery, chemical industry, metallurgy, molds, hydraulics, etc. Various fasteners can be seen on various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemical industry, meters, and supplies. They are the most widely used basic mechanical parts. They are characterized by a wide variety of product specifications, different performance uses, and a very high degree of standardization, serialization, and generalization.

[0003] The most common products of fasteners are mainly bolts. For bolt fasteners, their production and processing processes are numerous, and the processes for various fastener production and processing are also different. In the process of bolt production, the production links are also relatively numerous. The main several links include reducing diameter, heating, thread rolling, and quenching. Among them, thread rolling and quenching are directly related to the product quality of bolt fasteners. First, in the process of thread rolling, the main equipment includes two major structures: a movable thread rolling plate and a fixed thread rolling plate. After the current thread rolling plate structure, although its surface is plated with a coating, during long-term use, the thread rolling plate will inevitably be worn. If it is not replaced in time, it will affect the quality of batches of fasteners. Secondly, in the process of thread rolling, especially for the semi-finished fasteners with heat, during the threading process, part of the heat will be conducted to the thread rolling plate, and at the same time, a large amount of heat will be generated during the thread rolling process. In the long run and with the production method of the assembly line, it undoubtedly accelerates the loss of the thread rolling plate. Although there are some technical means to adopt the method of flowing water from top to bottom during the thread rolling process, allowing cold water or cold oil to directly flush the thread rolling area to assist in cooling, although this method can play a role in cooling to a certain extent, the main heat carried away is the heat generated in the previous process of the bolt fastener raw material. A large amount of heat is carried away, which will increase the difficulty of thread rolling. Secondly, in the current forging process, in the quenching stage, the bolts are very likely to crack during quenching. Even if the previous processes before quenching are all completed well, there is still an easy problem of cracking, that is, the stability of the fasteners decreases, resulting in a decrease in the yield rate. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for processing high-strength bolts with preloading calibration stress and its processing technology to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A preload calibrated stress high-strength bolt processing device includes a mounting track, a sliding sleeve, a rigid plate and a movable washboard, and is characterized in that the sliding sleeve is sleeved on the outer ring of the mounting track, the rigid plate is fixedly mounted on the side of the sliding sleeve, and the movable washboard is mounted on the side of the rigid plate.

[0007] The middle part of the left side of the rigid plate is hollow, the inner cavity of the rigid plate is provided with a plurality of partitions, the bottoms of the partitions and the inner wall of the rigid plate are provided with guide blocks, an atomizing plate is provided above the guide block, and a spraying hole is opened on the top of the atomizing plate.

[0008] Preferably, a liquid injection tube is installed through the top of the rigid plate, and liquid leakage holes are opened on the sides of the liquid injection tube.

[0009] Preferably, a sealing rubber pad is provided on the outer edge of the movable washboard, and the back side of the movable washboard contacts the side edge of the separator, the guide block and the atomizing plate.

[0010] Preferably, one side of the atomizing plate is fixedly connected to the inner wall of the rigid plate, the atomizing plate is installed at an angle, the spray hole is a 7-shaped hole, and there is a circular chamfer at the bend, and the top opening center line of the spray hole forms an angle of 130° with the atomizing plate.

[0011] Preferably, the guide block is a triangular block and is located below the spray hole, and a notch is provided at the bottom of one side of the guide block.

[0012] Preferably, balls are embedded in the top and bottom of the mounting track.

[0013] Preferably, a transverse bolt is provided on one side surface of the sliding sleeve, the outer ring of the transverse bolt is sleeved with a push shaft, the other end of the push shaft is installed on the side of the turntable through the transverse bolt, and the rotating shaft of the turntable passing through the center is installed on the output shaft of the motor.

[0014] A preload calibration stress high-strength bolt processing process comprises the following steps:

[0015] Drawing and reducing, blanking, heating, red upsetting, reducing, thread rolling, oil quenching, air cooling, tempering, air cooling, surface treatment and packaging.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The preloading calibration stress high-strength bolt processing device, namely the fastener thread rolling structure, is first designed in the form of a combined assembly of rolling plates. The most prominent effect is to facilitate the operation and maintenance of the equipment structure in the later stage. At the same time, it is designed in a way that some structures can be replaced or repaired. Compared with the traditional integral design, both the usage cost and the manufacturing cost are reduced. That is, when replacing, only one rolling plate needs to be replaced, without replacing all the associated structures on it together.

[0018] 2. The preloading calibration stress high-strength bolt processing device, namely the fastener thread rolling structure, is designed in a spray-type liquid cooling method, combined with a regional sub-packaging method, and heat exchange is carried out in a point-to-point small-impact contact manner. With the new form of thread rolling plate structure design, in each weekly working cycle of the thread rolling plate, both the heat generated by the friction between itself and the fastener and the heat brought by the fastener can be absorbed and transferred. It can ensure that the self-stability of the thread rolling plate is greatly reduced by the influence of temperature in each working cycle. That is, it can avoid the situation that the thread rolling plate is in a high-temperature state for a long time, its own structure is very active, and it is more likely to be worn and deformed. Even if there are slight deformations and wear, for the fastener, it will cause changes in the threads on it.

[0019] 3. For the preloading calibration stress high-strength bolt processing technology, the quenching temperature of the oil quenching process is 850 °C, super-cooling speed rapid quenching oil, kinematic viscosity 10, cooling speed at 600 °C is 105.8 °C / S, and cooling speed at 300 °C is 16 °C, which can avoid quenching cracks to the greatest extent and maintain the product stability.

[0020] 4. The preloading calibration stress high-strength bolt processing device, namely the fastener thread rolling structure, with the new thread rolling plate design, the heat transfer of its coolant completely comes from the output of the thread rolling power, without the need for an additional power source. And combined with the design of the thread rolling structure that greatly reduces the friction force, it can meet and achieve a new heat exchange function on the basis of the existing technology of thread rolling with the same power, which is more energy-saving and environmentally friendly. Brief Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the rigid plate structure of the present invention;

[0024] Figure 4 It is a schematic diagram of the atomizing plate structure of the present invention;

[0025] Figure 5 It is a schematic diagram of the spacer structure of the present invention.

[0026] In the figure: 1, erection track; 2, sliding sleeve; 3, rigid plate; 4, movable washboard; 5, atomizing plate; 6, partition piece; 7, guide block; 8, spraying hole; 9, liquid injection pipe; 10, liquid leakage hole; 11, cross bolt; 12, push shaft; 13, turntable; 14, motor. Specific implementation mode

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] Embodiment 1:

[0029] A preloading calibration stress high-strength bolt processing device includes an erection track 1, a sliding sleeve 2, a rigid plate 3 and a movable washboard 4. The sliding sleeve 2 is sleeved on the outer ring of the erection track 1. The rigid plate 3 is fixedly installed on the side surface of the sliding sleeve 3, and the movable washboard 4 is installed on the side surface of the rigid plate 3;

[0030] The middle part of the left side surface of the rigid plate 3 is in a hollow state. A plurality of partition pieces 6 are arranged in the inner cavity of the rigid plate 3. Guide blocks 7 are arranged at the bottom of the partition pieces 6 and the inner wall of the rigid plate 3. An atomizing plate 5 is arranged above the guide block 7, and spraying holes 8 are opened at the top of the atomizing plate 5.

[0031] As Figures 1-5As shown, this technical solution is mainly designed for the movable plate of bolt thread rolling. First, it is used in the way of assembling the movable rolling plate 4 and the rigid rolling plate 3, and can be quickly replaced and adjusted after the rolling plate completes the working cycle or reaches a certain number of uses; Secondly, the inner cavity of the rigid plate 3 stores coolant, which cooperates with the reciprocating movement of the movable rolling plate 4 to spray the coolant onto the back surface of the movable rolling plate 4 in the form of mist for cooling. During the reciprocating movement of the movable rolling plate 4, the purpose of cooling the rolling plate can be achieved, that is, taking away the heat generated by the friction of the thread rolling device, and at the same time, taking away part of the heat brought by the bolt fasteners, realizing the cooling and protection of the thread rolling structure during the thread rolling process. And in the form of mist spraying, the heat carrying rate is higher. During the actual thread rolling process, each structure can be installed on the metal frame. Since the metal frame is only a carrier of the structure, it will not be described and explained in this technical solution. When the movable rolling plate 4 moves back and forth, the coolant in its inner cavity will also shake due to its movement. When the coolant shakes, first due to inertia, the coolant will flow and collide with each other, generating water splashes. Then the water splashes hit the bottom of the atomizing plate 5, and then are sprayed onto the back surface of the movable rolling plate 4 through the spraying holes 8, absorbing and taking away part of the heat generated on the movable rolling plate 4 to cool and protect it.

[0032] Embodiment 2:

[0033] A liquid injection pipe 9 is installed through the top of the rigid plate 3, and leakage holes 10 are opened on the side of the liquid injection pipe 9.

[0034] The difference between this embodiment and Embodiment 1 is that, as Figure 2 shown, the liquid injection pipe 9 successively penetrates through the top and bottom of the rigid plate 3, the atomizing plate 5, the partition piece 6 and the bottom of the rigid plate 3 from top to bottom, and the leakage holes 10 are respectively located above the bottom of the inner wall of the rigid plate 3 and above each partition piece 6. After the movable rolling plate 4 works for a period of time, the coolant inside it has also absorbed a large amount of heat. At this time, the plugs at the top and bottom of the liquid injection pipe 9 can be removed to let the coolant in the rigid plate 3 flow out, and then the bottom of the liquid injection pipe 9 is re-sealed, and coolant is re-injected from the upper port. The coolant entering the liquid injection pipe 9 will flow out at each leakage hole 10, fall on the bottom of the rigid plate 3 and each partition piece 6, and finally re-seal the upper port of the liquid injection pipe 9.

[0035] Embodiment 3:

[0036] Sealing gaskets are arranged on the outer edges of the movable rolling plate 4, and the back surface of the movable rolling plate 4 abuts against the side edges of the partition piece 6, the guide block 7 and the atomizing plate 5.

[0037] The difference between this embodiment and Embodiment 1 and Embodiment 2 is that, as Figure 3As shown, the setting of the sealing pad is firstly for airtightness consideration, that is, the movable washboard 4 and the internal space of the rigid plate 3 form a closed space to avoid the loss of coolant. Secondly, the sealing pad can still play a certain buffering role to avoid the wear of the movable washboard 4. That is, during daily maintenance and inspection, the condition of the movable washboard 4 can be simply judged according to the firmness of the movable washboard 4. If the movable washboard 4 is loose on the rigid plate 3, it means that the movable washboard 4 has a certain loss during the thread rolling process and needs to be replaced or maintained to avoid quality defects of the thread rolling fasteners. Since the sealing pad has no direct friction with the fastener raw material, Therefore, its practical use time is roughly equivalent to the wear time of the movable washboard 4, and its material selection also needs to be selected according to actual production conditions, and is not limited to rubber material; finally, the side of the movable washboard 4 is in conflict with the side of the separator 6, the guide block 7 and the atomizing plate 5, so that the coolant in each area can work independently of each other without causing heat mixing. At the same time, the coolant in the rigid plate 3 can also absorb heat in a regional targeted manner. The coolant sprayed on the movable washboard 4 in the area between every two separators 6 will only flow to the original area after heat exchange, and can be recovered solidly and accurately.

[0038] Embodiment 4:

[0039] One side of the atomizing plate 5 is fixedly connected to the inner wall of the rigid plate 3 . The atomizing plate 5 is installed at an angle. The spray hole 8 is a 7-shaped hole with a circular chamfer at the bend. The top opening center line of the spray hole 8 forms an angle of 130° with the atomizing plate 5 .

[0040] The difference between this embodiment and the above embodiment is that Figure 5 As shown, the special design of the spray hole 8 is mainly to allow the coolant coming out of the spray hole 8 to be accurately sprayed onto the movable washboard 4, and the coolant coming out of the spray hole 8 hits the movable washboard in the form of mist or water droplets, which can optimize the heat absorption effect of the coolant, that is, it can take away the maximum amount of heat it can take away. The purpose of the inclined installation of the atomizing plate 5 is to increase the contact area between the bottom of the atomizing plate 5 and the coolant. When used in conjunction with the special spray hole 8, the coolant can achieve more accurate point-to-point heat exchange.

[0041] Embodiment 5:

[0042] The guide block 7 is a triangular block and is located below the spray hole 8 . A notch is provided at the bottom of one side of the guide block 7 .

[0043] In this embodiment, Figure 5As shown in the figure, first of all, due to the design of the triangular block, the reciprocating coolant can move upward along its inclined surface, playing a steering role, so that the coolant impacts the bottom of the atomizing plate 5. The main function of the notch is to allow the coolant flowing back along the back of the movable rubbing plate 4 to be distributed in the area between the respective guiding blocks 7.

[0044] Embodiment 6:

[0045] Both the top and bottom of the erected track 1 are embedded with balls 15. A cross bolt 11 is provided on one side of the sliding sleeve 2. The outer ring of the cross bolt 11 is sleeved with a pushing shaft 12. The other end of the pushing shaft 12 is installed on the side of the turntable 13 through the cross bolt 11. The turntable 13 is installed on the output shaft of the motor 14 through a shaft passing through its center.

[0046] In this embodiment, the balls 15 on the erected track 1 are mainly to reduce the friction of the sliding sleeve 2 moving thereon, which is more conducive to the smooth realization of the reciprocating movement of wire rolling. At the same time, it can also reduce the energy consumption of production. The installation method of the motor 14 is the same as that of the erected track 1, installed on the frame of the production equipment. And in order to achieve automated production, numerical control can be used to control the operation of the motor.

[0047] Embodiment 7:

[0048] A processing technology for high-strength bolts with preloading calibration stress includes the following steps:

[0049] Drawing and reducing diameter, blanking, heating, red heading forming, reducing diameter, thread rolling, oil quenching, air cooling, tempering, air cooling, surface treatment, packaging. The quenching temperature of the oil quenching process is 850 °C, super-cooling speed rapid quenching oil, kinematic viscosity 10, cooling speed at 600 °C is 105.8 °C / S, cooling speed at 300 °C is 16 °C, which can avoid quenching cracks to the greatest extent and maintain product stability.

[0050] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0051] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for processing high-strength bolts with preloading calibration stress, comprising an erection track (1), a sliding sleeve (2), a rigid plate (3) and a movable corrugated plate (4). Characterized in that: The sliding sleeve (2) is sleeved on the outer ring of the erection track (1), the rigid plate (3) is fixedly installed on the side of the sliding sleeve (3), and the movable corrugated plate (4) is installed on the side of the rigid plate (3); the middle part of the left side of the rigid plate (3) is hollow, and a plurality of partition plates (6) are arranged in the inner cavity of the rigid plate (3). Guide blocks (7) are arranged at the bottom of the partition plate (6) and the inner wall of the rigid plate (3), a fogging plate (5) is arranged above the guide block (7), and spraying holes (8) are formed at the top of the fogging plate (5). One side of the fogging plate (5) is fixedly connected to the inner wall of the rigid plate (3), the fogging plate (5) is inclinedly installed, the spraying holes (8) are 7-shaped holes, and there is an arc chamfer at the bending part. The center line of the top opening of the spraying hole (8) forms an angle of 130° with the fogging plate (5).

2. A device for processing high-strength bolts with preloading calibration stress according to claim 1, Characterized in that: A liquid injection pipe (9) is installed through the top of the rigid plate (3), and liquid leakage holes (10) are formed on the side of the liquid injection pipe (9).

3. A device for processing high-strength bolts with preloading calibration stress according to claim 1, Characterized in that: Sealing gaskets are arranged on the outer edges of the movable corrugated plates (4), and the back of the movable corrugated plates (4) abuts against the partition plates (6), the guide blocks (7) and the side edges of the fogging plates (5).

4. A device for processing high-strength bolts with preloading calibration stress according to claim 1, Characterized in that: The guide block (7) is a triangular block and is located below the spraying hole (8), and a notch is arranged at the bottom of one side of the guide block (7).

5. A device for processing high-strength bolts with preloading calibration stress according to claim 1, Characterized in that: Ball bearings (15) are embedded at the top and bottom of the erection track (1).

6. A device for processing high-strength bolts with preloading calibration stress according to claim 1, Characterized in that: A cross bolt (11) is arranged on one side of the sliding sleeve (2), a pushing shaft (12) is sleeved on the outer ring of the cross bolt (11), the other end of the pushing shaft (12) is installed on the side of a turntable (13) through the cross bolt (11), and the turntable (13) is installed on the output shaft of a motor (14) through a central penetrating rotating shaft.

7. A processing process for high-strength bolts with preloading calibration stress, applied to a device for processing high-strength bolts with preloading calibration stress according to claim 1, Characterized in that, Comprising the following steps: Drawing and reducing diameter, blanking, heating, hot heading forming, reducing diameter, thread rolling, oil quenching, air cooling, tempering, air cooling, surface treatment, packaging.

8. A processing process for high-strength bolts with preloading calibration stress according to claim 7, Characterized in that: The quenching temperature of the oil quenching process is 850°C.

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