Heat treatment control device for correcting part size

Abstract

The utility model discloses a heat treatment control device for correcting the size of a part. The lifting appliance consists of a lifting rod and a base; the base plate penetrates through the suspender and is horizontally arranged on the base, and the center of the base plate coincides with the centers of the suspender and the base; the adjusting ring is a straight ring or a taper ring or a combination of the straight ring and the taper ring, parts with different sizes can be adjusted and corrected, the adjusting ring is horizontally placed on the bottom plate, and the center of the adjusting ring coincides with the center of the lifting appliance; ring-type, cylinder-type or disc-type parts are placed outside the adjusting ring, and it is guaranteed that gaps between the parts and the adjusting ring are uniform and consistent; and the cover plate is directly placed at the upper ends of the part and the adjusting ring. According to the device provided by the utility model, the base plate, the part, the adjusting rings and the cover plate form a closed solid body, different adjusting rings and combinations thereof are utilized to reduce the cooling speed of the inner wall and enable different parts of the part to form a larger temperature difference in a heat treatment rapid cooling process under the condition of ensuring rapid cooling of an outer circle, and the thermal expansion and cold contraction principle is utilized; and correcting and adjusting the part size.

Description

Technical Field

[0001] The utility model relates to the technical field of heat treatment, and more particularly to a heat treatment control device for correcting the size of parts. Background Art

[0002] Heat treatment is a key process for improving component performance. Carburizing and quenching are commonly used to enhance performance in low-carbon steel and low-carbon alloy steel. Surface carburizing followed by quenching creates a carburized, hardened layer in areas such as the teeth, resulting in high hardness, fatigue resistance, and friction and wear resistance. Core quenching simultaneously produces low-carbon lath martensite, which exhibits high strength and excellent ductility. For medium-carbon steel, tempering (quenching followed by high-temperature tempering) creates a tempered bainite structure, resulting in a good balance of strength and ductility, resulting in excellent overall mechanical properties. For bearing steel, quenching followed by low-temperature tempering achieves high strength and hardness, improving wear resistance and contact fatigue strength. Carburizing and quenching, tempering, and quenching are widely used in gear and bearing processing in industries such as wind power, nuclear power, shipbuilding, metallurgy, and hydraulic engineering. For some large gears or bearings in this industry, during the manufacturing process, due to the combined effects of the uniformity of the forging blank's structure, the stress during processing and the stress during heat treatment, it will cause its deformation and changes in its external dimensions. Sometimes there will be problems such as small size, which cannot meet the subsequent processing requirements. For such parts, currently, heating to A is generally used. C1 or A C3 In addition to the above-mentioned methods of normalizing or annealing to reduce dimensions, there are also methods of remachining to the required dimensions and then heat treating. These methods require heating above the austenitizing temperature, which can lead to oxidation and decarburization, high energy consumption, large deformation, and complex processes. Machining, for example, can result in uneven layer depth and hardness in carburized and quenched gears, affecting the performance of the final product or causing certain dimensions to fail and become scrapped. Therefore, developing a heat treatment control device for correcting part dimensions that is simple in structure, easy to install and adjust, convenient to use, and low in cost is of great practical significance. Utility Model Content

[0003] In view of this, the utility model provides a heat treatment control device for correcting the size of parts. For parts whose size is reduced during the heat treatment process, their size is corrected and adjusted to the processing range. The control device is used in combination with the corresponding heat treatment method, and is economical, efficient and low-cost, thereby solving the shortcomings of high manufacturing cost and prone to quality problems in conventional methods.

[0004] The utility model provides a heat treatment control device for correcting the size of parts, and the technical solution adopted is:

[0005] A heat treatment control device for correcting the size of a part, the device comprising a sling consisting of a base (1) and a sling rod (2), a pad (3) being provided on the base (1), an adjusting ring (4) being provided on the pad (3), a part being placed outside the adjusting ring (4), and a cover plate (5) being placed on the upper end of the adjusting ring (4) and the part.

[0006] Preferably, the base (1) is a hollow structure, and a pad (3) is provided on the base (1). The pad (3) is a flat plate structure, and the outer circle size is the same as or slightly larger than that of the part.

[0007] Preferably, an adjustment ring (4) is provided on the pad (3), and the adjustment ring (4) is a circular ring structure with a rectangular cross-section.

[0008] Preferably, the adjustment ring (4) is a circular ring structure with a trapezoidal cross-section.

[0009] Preferably, the adjustment rings (4) are combined to form cross sections with different thicknesses.

[0010] Preferably, a cover plate (5) is provided on the adjusting ring (4) and the component.

[0011] The utility model provides a heat treatment control device for correcting the size of parts, comprising: a sling; the sling is composed of a sling and a base; a pad, the pad passes through the sling, is horizontally placed and installed on the base, and its center coincides with the center of the sling and the base; an adjusting ring, the adjusting ring is composed of a straight ring or a tapered ring, which is used alone or in combination and can adjust and correct parts of different sizes, the adjusting ring is horizontally placed on the base, and its center coincides with the center of the sling; ring-type, cylinder-type or disk-type parts are placed outside the adjusting ring to ensure that the gap between the part and the adjusting ring is uniform; a cover plate, the cover plate is directly placed on the upper end of the part and the adjusting ring. The heat treatment control device for correcting the size of parts provided by the utility model forms a closed entity through a pad, a part, an adjusting ring and a cover plate, utilizes different adjusting rings and their combination, and through special heat treatment process and conditions, during the rapid cooling process of the heat treatment, ensures that the outer circle is quickly cooled while reducing the cooling rate of the inner wall, so that a large temperature difference is formed in different parts of the part, utilizes the principle of thermal expansion and contraction to correct and adjust the size of the part, and realizes better overall interaction, and can correct and adjust the size of the part at a lower temperature without changing the part structure, so as to obtain a size that meets the requirements of subsequent processing; at the same time, the heat treatment control device has a simple structure, is easy to install and adjust, and is easy to use, because it does not need to be installed in A C1 The above high temperature zone heating can also use a more intense cooling medium. The device is made of ordinary carbon steel, saving high-value precious metals, so it has the advantage of low cost, thereby solving the shortcomings of high manufacturing cost and prone to quality problems in conventional methods.

[0012] The present invention also provides a heat treatment control method for correcting the size of a part, wherein the part to be corrected is placed in a correction device, heated, and then rapidly cooled, reheated, and air-cooled in sequence to obtain the part with the corrected size; the correction device includes a sling, a pad, a cover plate, and an adjustment ring that match the part to be corrected. Compared with the prior art, the heat treatment control device for correcting the size of a part provided by the present invention is combined with a heat treatment process method, and applies the principle of thermal expansion and contraction to achieve better overall interaction. It can correct and adjust the size of the part at a lower temperature without changing the structure of the part, and obtain a size that meets the requirements of subsequent processing; at the same time, the heat treatment device has a simple structure, is easy to install and adjust, and is easy to use, because it does not require A C1 The above high temperature zone heating can also use a more intense cooling medium. The device is made of ordinary carbon steel, saving high-value precious metals, so it has the advantage of low cost, thereby solving the shortcomings of high manufacturing cost and prone to quality problems in conventional methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Heat treatment control device for correcting part dimensions and its top view;

[0014] Figure 2 Schematic diagram of the structure of the adjustment ring without taper and with taper;

[0015] Figure 3 Diagram of a heat treatment control device with a taper adjustment ring for correcting part dimensions;

[0016] Figure 4 Diagram of a heat treatment control device with a combined adjustment ring for correcting part dimensions. DETAILED DESCRIPTION

[0017] In order to better understand the essence of the present invention, the present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions and related processes of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] The utility model provides a heat treatment control device and method for correcting the size of parts. Figures 1 to 4 As shown; the method specifically comprises the following steps:

[0020] a) The part to be corrected is placed in the correction device, heated, and then rapidly cooled, reheated, and air-cooled in sequence to obtain the corrected part;

[0021] The correction control device comprises a sling, a backing plate, a cover plate and an adjustment ring that match the part whose size is to be corrected.

[0022] Since the traditional method of correcting the size of parts is to heat the parts to the temperature range of incomplete austenite or complete austenite and then perform normalizing or annealing, there will be problems such as large deformation, easy oxidation and decarburization, and high energy consumption; the use of machining methods will lead to problems such as uneven depth and hardness of the carburized gear layer, so its use has certain limitations. This utility model mainly forms a closed space entity to reduce and adjust the cooling rate of the inner hole of the part. For parts of different sizes, a non-tapered adjustment ring or a tapered adjustment ring or a combination thereof can be used in a targeted manner. The principle of thermal expansion and contraction is used to adjust the cooling rate at the austenite transformation temperature A C1 The following treatment is carried out by adopting appropriate heat treatment process to shrink and correct the dimensions of parts such as discs, cylinders and rings.

[0023] In the present invention, the parts to be corrected in size preferably include ring parts, cylinder parts or disc parts; the material of the parts to be corrected in size preferably includes quenched and tempered medium carbon steel and medium carbon alloy steel, such as 45 steel, 40Cr steel, 35CrMo steel, 42CrMo steel, 40CrNiMo steel, 30CrNiMo8 steel, 34CrNiMo6 steel; and carburized and quenched low carbon steel and low carbon alloy steel, such as 20Cr steel, 20CrMo steel, 20CrMnTi steel, 20CrMnMo steel, 17CrNiMo6 steel, 18CrNiMo7-6 steel, 20Cr2Ni4 steel or 18Cr2Ni4W steel; and high carbon bearing steel such as GCr15 steel, GCr15SiMn steel, etc.

[0024] In the present invention, the above-mentioned ring gear, disc gear or other ring, cylinder, and disc parts are quenched and tempered at normal temperature, and then the size of the parts is detected. If it is found that the size of the parts has increased and cannot meet the subsequent processing requirements, detailed size detection and recording are performed on such parts; then, the parts that need to be reduced in size (parts whose size is to be corrected) are installed in the correction control device.

[0025] In the present invention, the correction control device includes a base, a suspension rod, a pad, a cover plate and an adjustment ring that match the part whose size is to be corrected; see Figure 1 As shown; the correction device is composed of a base (1), a suspension rod (2), a pad (3), an adjustment ring (4) and a cover plate (5); the tire installation process in the correction control device is preferably specifically as follows:

[0026] Select a sling of appropriate size according to the size of the part, first pass the sling through the center hole of the base, assemble it, place the pad (3) horizontally and centrally in the center of the base (1), and then place the part to be corrected horizontally directly on the pad (3), with the center of the part coinciding with the center of the sling; the outer circle of the pad (3) is consistent with or slightly larger than the outer circle of the part, with a thickness of 10mm~50mm, and the inner hole size is 300mm~700mm smaller than the inner hole of the part; place an adjustment ring (4) that matches the inner hole size of the part; the outer circle size of the adjustment ring (4) is 10mm~200mm smaller than the inner hole size of the part, the height is consistent with the height of the part, and the thickness is 150mm~300mm. When placing the adjustment ring (4), ensure that its center coincides with the center of the sling, and the gap between the outer circle of the adjustment ring (4) and the inner hole of the part is roughly uniform; apply a pressure cover plate (5) on the upper end of the part, and the cover plate (5) 3 is 10mm~50mm thick.

[0027] The control device and parts are heated in a furnace according to step a). After heating, the control device and parts are placed in a stirring quenching medium for rapid cooling. The control device and parts can then be heated again and air-cooled to room temperature. Afterwards, the parts with corrected dimensions obtained by the treatment of the present invention are removed for inspection to determine whether the dimensions of the parts have met the expected requirements. If the dimensions of the parts have shrunk to the predetermined dimensions and meet the expectations, no further treatment is required. If the dimensions of the parts have not yet met the expected requirements, the parts can be further shrunk to correct and adjust their dimensions to meet the requirements. On this basis, the heat treatment method for correcting the dimensions of the parts preferably also includes:

[0028] b) Perform secondary correction on the parts after size correction to obtain parts with corrected size that meets the requirements.

[0029] After the parts are processed by the present invention, they are re-installed according to the requirements of the above technical solution based on the conditions of the parts after inspection; in the process of installing the parts after the size correction in the correction control device, the large end is placed upwards. For parts with larger tapers, the adjusting ring (4) is used in the form of an inner hole with a taper, see Figure 2 As shown, the small end of the inner hole of the adjusting ring (4) is placed upward and the large end of the inner hole is placed downward. By increasing the heat storage and higher temperature of the large end of the part, when the part is water-cooled and shrunk, the shrinkage of the large end of the part can be increased due to the large heat storage, high temperature, low strength and good shaping at the upper end, thereby reducing the taper deformation of the large and small ends of the part. The schematic diagram is shown in FIG. Figure 3 For parts with small shrinkage correction, a combination of tapered and non-tapered adjustment rings can also be used. See the schematic diagram for details. Figure 4 .

[0030] The utility model adopts the above-mentioned adjusting ring (4) structure and furnace loading method for parts with larger taper, wherein the adjusting ring (4) is 20mm~30mm smaller than the inner hole of the part, and its shape is the form of the inner hole with taper. When loading the furnace, the large end of the adjusting ring must be consistent with the direction of the large end of the part deformation.

[0031] Heat the control device and parts in a furnace according to step b). After heating, rapidly cool the control device and parts in a stirring quenching medium. The control device and parts can then be reheated and air-cooled to room temperature. Afterwards, remove the corrected parts obtained by the present invention and inspect them to determine whether the part dimensions have met the desired requirements. Medium-carbon and medium-carbon alloy steels that meet the quenching conditions can undergo quenching and high-temperature tempering. The appropriate heat treatment process is determined based on the material and the hardness requirements after quenching and tempering. For parts with large elliptical deformation, upper die quenching can be used. During the quenching and high-temperature tempering process, further rounding of the parts can be achieved. For low-carbon and low-carbon alloy steels and high-carbon bearing steels, quenching and low-temperature tempering can be performed. The appropriate heat treatment process is determined based on the material and the hardness requirements after quenching. For parts with large elliptical deformation, upper die quenching can be used. During the quenching and low-temperature tempering process, further rounding of the parts can be achieved. Part dimensions and hardness requirements should be inspected to ensure they meet the relevant technical requirements.

[0032] The present invention provides a heat treatment control device and method for correcting the size of a part. After the part to be corrected is placed in the correction device, it is heated, and then rapidly cooled, reheated, and air-cooled in sequence to obtain the part with the corrected size. The correction device includes a sling, a pad, a cover plate, and an adjustment ring that match the part to be corrected. Compared with the prior art, the heat treatment control device for correcting the size of a part provided by the present invention is combined with a heat treatment process method, and applies the principle of thermal expansion and contraction to achieve better overall interaction. It can correct and adjust the size of the part at a lower temperature without changing the part structure, and obtain a size that meets the requirements of subsequent processing. At the same time, the heat treatment control device has a simple structure, is easy to install and adjust, and is easy to use. Since it does not require A C1 The above high temperature zone heating can also use a more intense cooling medium. The device is made of ordinary carbon steel, saving high-value precious metals, so it has the advantage of low cost, thereby solving the shortcomings of high manufacturing cost and prone to quality problems in conventional methods.

[0033] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat treatment control device for correcting part dimensions, characterized in that: The sling comprises a base (1) and a sling rod (2), wherein a pad (3) is provided on the base (1), an adjusting ring (4) is provided on the pad (3), a part is placed outside the adjusting ring (4), and a cover plate (5) is placed on the upper end of the adjusting ring (4) and the part.

2. The heat treatment control device for correcting part dimensions according to claim 1, characterized in that: The backing plate (3), the adjusting ring (4), the cover plate (5) and the parts form a closed structure.

3. The heat treatment control device for correcting part dimensions according to claim 1, characterized in that: The adjusting ring (4) is a circular ring structure, the cross section of which is a rectangular or trapezoidal cross section, and the height of which is the same as the height of the part.

4. The heat treatment control device for correcting part dimensions according to claim 1, characterized in that: Depending on the need to correct the size of the part, the adjusting ring with a rectangular cross section or the adjusting ring with a trapezoidal cross section can be placed separately or in combination.

Images