A carburizing micro-deformation clamping method and clamping device for thin-walled large inner hole flat gears

Abstract

The present invention discloses a carburizing micro-deformation clamping method and a clamping device for thin-walled large inner hole flat gears, belonging to the field of heat treatment technology. The clamping method and the clamping device of the present invention include two parts: a workpiece string hanging fixation and a workpiece end face fixation. The workpiece string hanging fixation is to string the center hole of the thin-walled large inner hole flat gear on a horizontal string hanging rod, and the workpiece end face fixation is to clamp and fix the end faces of both sides of the thin-walled large inner hole flat gear with end face fixing rods respectively. The thin-walled large inner hole flat gear is clamped by string hanging, and the horizontal string hanging rod is reasonably set to make the string hanging rod support the workpiece in the best state. Experiments have shown that it can effectively prevent the inner hole of the gear from being out of round after carburizing, and greatly reduce the distortion of the tooth shape; at the same time, the end faces of both sides of the gear are clamped and fixed with end face fixing rods respectively, and the string hanging clamping effectively prevents the plane warping of such gears, prevents the tooth shape from being distorted, and improves the dimensional accuracy of the thin-walled large inner hole flat gear after carburizing.

Description

Technical Field

[0001] The invention relates to a heat treatment clamping method and device, and more specifically to a carburizing micro-deformation clamping method and a clamping device for a thin-walled large inner hole flat gear. Background Art

[0002] Carburizing the surface of gears is the main process to improve their surface hardness and wear resistance, and the carburizing process is often accompanied by deformation of the parts. Figure 1 It is a plan schematic diagram of an existing thin-walled large inner hole flat gear 100, which has a large center hole 101 in the center. The entire thin-walled large inner hole flat gear 100 is annular in structure. Since the gear has a thin-walled structure, it is more likely to deform during the carburizing process compared to other types of gears, resulting in the workpiece shape and size being out of tolerance and being scrapped, causing serious losses and waste.

[0003] Due to the particularity of the shape and structure of the above-mentioned thin-walled large inner hole flat gear, the deformation of the workpiece has always been a difficult problem in the industry during the actual carburizing and quenching process. To reduce or suppress the deformation of the workpiece, not only a suitable heat treatment process is required, but also a reasonable workpiece clamping device is required. Chinese Patent Application No. 202010138536.5 discloses "a control process for carburizing and quenching deformation of thin plate large diameter gears", which includes a carburizing tool for hanging gears and process steps: cleaning the thin plate large diameter gear; applying an anti-seepage coating on the non-carburizing surface of the thin plate large diameter gear; hanging the thin plate large diameter gear to the end of the hanging arm; carburizing and quenching heat treatment of the gear according to the drawings or conventional process design requirements; data tracking of the products completed in the hanging carburizing and quenching process. The hanging tool of this patent application adopts a hanging method to prepare materials, which can prevent the conical deformation of the upper and lower ends of the teeth, and the easy occurrence of runout warping causes large gear section runout, which in turn affects the irregular deformation of the gear common normal line. However, due to the influence of factors such as the gravity of the workpiece, this hanging method is prone to cause the inner hole of the gear to be out of round during the carburizing and quenching process, and due to the lack of clamping constraints on the end face of the workpiece, a certain plane warping will also occur, which will lead to distortion of the workpiece tooth shape.

[0004] Based on the particularity of the shape and structure of the existing thin-walled large inner hole flat gear, in order to reduce the carburizing and quenching deformation of the workpiece, it is necessary to design a reasonable clamping method and clamping device. Summary of the invention

[0005] 1. Technical problem to be solved by the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the existing thin-walled large inner hole flat gear heat treatment clamping method that is unreasonable, resulting in large carburizing distortion of the workpiece, and to provide a thin-walled large inner hole flat gear carburizing micro-deformation clamping method and clamping device, adopting the technical scheme of the present invention, clamping the thin-walled large inner hole flat gear in a string hanging manner, and through the reasonable setting of the horizontal string hanging rod, the string hanging rod supports the thin-walled large inner hole flat gear in an optimal state. Experiments have shown that it can effectively prevent the inner hole from losing roundness after carburizing the gear, and greatly reduce the distortion of the tooth shape; at the same time, the end faces of both sides of the thin-walled large inner hole flat gear are clamped and fixed by end face fixing rods respectively, and the string hanging clamping is combined to effectively prevent the plane warping of such gears, further prevent the tooth shape from being distorted, and improve the dimensional accuracy of the thin-walled large inner hole flat gear after carburizing.

[0007] 2. Technical solution

[0008] In order to achieve the above object, the technical solution provided by the present invention is:

[0009] The present invention discloses a carburizing micro-deformation clamping method for thin-walled large inner hole flat gears, which comprises two parts: a workpiece string hanging fixation and a workpiece end face fixation, wherein:

[0010] Workpiece hanging and fixing: Hang the center hole of the thin-walled large inner hole flat gear on the horizontal hanging rod. The horizontal hanging rod has two supporting points on the circumference of the center hole, and the distance A between the two supporting points of the horizontal hanging rod on the circumference of the center hole is calculated by the following formula:

[0011] Where r is the radius of the center hole of the thin-walled large inner hole flat gear;

[0012] Workpiece end face fixing: After the workpiece is hung and fixed, the end faces on both sides of the thin-walled large inner hole flat gear are clamped and fixed with end face fixing rods. The upper and lower end face fixing rods are respectively located within the ring width ΔR of the thin-walled large inner hole flat gear. ΔR is the difference between the outer circle radius R1 of the thin-walled large inner hole flat gear and the center hole radius R2.

[0013] Furthermore, the horizontal hanging rod is fixed by at least two heat-resistant round rods, and the arc surface of the outermost heat-resistant round rod is used to hang and support the circumference of the center hole.

[0014] Furthermore, the heat-resistant round rods in the horizontal string hanging rods are fixedly connected by spot welding.

[0015] Furthermore, the end face fixing rod is made of a heat-resistant round rod, and the end face fixing rod is horizontally arranged on both sides of the thin-walled large inner hole flat gear end face, and is respectively located at half of the ring width ΔR on both sides of the thin-walled large inner hole flat gear end face.

[0016] A carburizing micro-deformation clamping device for thin-walled large-inner-hole spur gears of the present invention includes a horizontal hanging rod, an end face fixing rod, a frame, hanging support rods and end face support rods. The hanging support rods are horizontally arranged at several layers on the frame in the height direction, and at least two parallel hanging support rods are arranged on the frame for each layer. The two ends of the horizontal hanging rod are positioned and installed on the hanging support rods of each layer. Each horizontal hanging rod has two support points on the circumferential surface of the central hole of the thin-walled large-inner-hole spur gear, and the distance between the two support points of the horizontal hanging rod on the circumferential surface of the central hole where r is the radius of the central hole of the thin-walled large-inner-hole spur gear; the end face support rods are perpendicularly fixed to the frame with respect to the hanging support rods. The two ends of the end face fixing rod are respectively detachably installed on the end face support rods on the corresponding sides. End face support rods are provided above and below both end faces of the thin-walled large-inner-hole spur gear strung on the hanging support rods, and the upper and lower end face fixing rods are both within the ring width ΔR of the thin-walled large-inner-hole spur gear.

[0017] Furthermore, the end face fixing rod is a "U"-shaped rod made of a heat-resistant round bar. A plurality of jacks are provided on the end face support rods. The two ends of the end face fixing rod are respectively inserted and fixed in the jacks of the end face support rods on the corresponding sides.

[0018] Furthermore, the end face fixing rods are respectively located at the midpoints of the ring width ΔR above and below the end faces of the thin-walled large-inner-hole spur gear.

[0019] Furthermore, the horizontal hanging rod is fixed by at least two heat-resistant round bars, and the adjacent heat-resistant round bars are fixedly connected by spot welding.

[0020] Furthermore, a plurality of positioning grooves are provided at intervals on the hanging support rods. The two ends of the horizontal hanging rod are positioned and placed in the positioning grooves of the corresponding hanging support rods.

[0021] Furthermore, the frame is a rectangular frame structure. A plurality of layers of hanging support rods are provided on the frame. A plurality of rows of parallel horizontal hanging rods are provided on each layer of hanging support rods. A plurality of thin-walled large-inner-hole spur gears are strung at intervals on each horizontal hanging rod.

[0022] 3. Beneficial effects

[0023] Adopting the technical solution provided by the present invention, compared with the existing well-known technologies, the following remarkable effects are achieved:

[0024] (1) A carburizing micro-deformation clamping method and clamping device for thin-walled large-inner-hole spur gears of the present invention includes two parts: workpiece hanging and fixing and workpiece end face fixing. Workpiece hanging and fixing is to string the central hole of the thin-walled large-inner-hole spur gear on the horizontal hanging rod, and the distance between the two support points of the horizontal hanging rod on the circumferential surface of the central hole The workpiece end face fixing is carried out after the workpiece is strung and fixed. The two side end faces of the thin-walled large-inner-hole spur gear are respectively clamped and fixed by end face fixing rods up and down, and the upper and lower end face fixing rods are respectively located within the ring width ΔR of the thin-walled large-inner-hole spur gear; the thin-walled large-inner-hole spur gear is clamped by means of stringing, and through the reasonable setting of the horizontal stringing rod, the support of the stringing rod to the thin-walled large-inner-hole spur gear reaches the best state. Experiments prove that it can effectively prevent the inner hole of the gear from becoming out-of-round after carburizing, and greatly reduce the distortion of the tooth profile; at the same time, the two side end faces of the thin-walled large-inner-hole spur gear are respectively clamped and fixed by end face fixing rods up and down, cooperating with the stringing clamping, effectively preventing the plane warping of such gears, further preventing the tooth profile from being distorted, and improving the dimensional accuracy of the thin-walled large-inner-hole spur gear after carburizing;

[0025] (2) For the carburizing micro-deformation clamping method and clamping device of a thin-walled large-inner-hole spur gear of the present invention, its horizontal stringing rod is fixed by at least two heat-resistant round bars. The arc surface of the heat-resistant round bar is used for stringing and supporting the circumferential surface of the central hole. The round bar supports the gear central hole more stably, and can prevent the horizontal stringing rod from wearing the circumferential surface of the gear central hole;

[0026] (3) For the carburizing micro-deformation clamping method and clamping device of a thin-walled large-inner-hole spur gear of the present invention, the heat-resistant round bars in the horizontal stringing rod are fixedly connected by spot welding. The heat-resistant round bars are convenient to obtain materials, the structure of the horizontal stringing rod is simple, and it is convenient to manufacture;

[0027] (4) For the carburizing micro-deformation clamping method and clamping device of a thin-walled large-inner-hole spur gear of the present invention, the end face fixing rod is made of a heat-resistant round bar, and the end face fixing rod is horizontally arranged on the upper and lower sides of the end face of the thin-walled large-inner-hole spur gear and is respectively located at half of the ring width ΔR on the upper and lower sides of the end face of the thin-walled large-inner-hole spur gear, which can make the clamping of the end face of the thin-walled large-inner-hole spur gear more stable and further reduce the plane warping deformation of the gear;

[0028] (5) For the carburizing micro-deformation clamping device of a thin-walled large-inner-hole spur gear of the present invention, it includes a horizontal stringing rod, an end face fixing rod, a frame, a stringing support rod and an end face support rod. The frame structure design can clamp more layers of workpieces at one time, and the clamping operation is simple and convenient, which is convenient for mass production;

[0029] (6) For the carburizing micro-deformation clamping device of a thin-walled large-inner-hole spur gear of the present invention, the end face fixing rod is a "U"-shaped rod made of a heat-resistant round bar. There are several jacks on the end face support rod, and the two ends of the end face fixing rod are respectively inserted and fixed in the jacks of the corresponding side end face support rod. The structure design is simple, the installation and disassembly are convenient, and the clamping of the workpiece end face is stable and reliable. Description of the Drawings

[0030] Figure 1It is a schematic plan view of an existing thin-walled flat gear with a large inner hole;

[0031] Figure 2 Schematic diagram of the calculation principle of the distance A between the two outermost supporting points in the clamping method of the present invention;

[0032] Figure 3 Schematic diagram of the support of the thin-walled flat gear with large inner hole by the horizontal string hanging rod in the present invention (two heat-resistant round rods with equal diameter);

[0033] Figure 4 Schematic diagram of the support of the thin-walled flat gear with large inner hole by the horizontal string hanging rod in the present invention (three heat-resistant round rods with equal diameter);

[0034] Figure 5 Schematic diagram of the support of the thin-walled flat gear with large inner hole by the horizontal string hanging rod in the present invention (three heat-resistant round rods of unequal diameters);

[0035] Figure 6 Schematic diagram of the support of the thin-walled flat gear with large inner hole by the horizontal string hanging rod in the present invention (four heat-resistant round rods with equal diameter);

[0036] Figure 7 Schematic diagram of the end face fixing rod clamping the end face of the thin-walled large inner hole flat gear in the present invention;

[0037] Figure 8 A schematic side structural diagram of a carburizing micro-deformation clamping device for a thin-walled, large-inner-hole flat gear according to the present invention;

[0038] Fig. 9 A schematic top view of the structure of a carburizing micro-deformation clamping device for a thin-walled large inner hole flat gear according to the present invention.

[0039] Explanation of the symbols in the schematic diagram:

[0040] 100, thin-walled flat gear with large inner hole; 101, center hole;

[0041] 1. Horizontal string hanging rod; 2. End fixing rod; 3. Frame; 4. String hanging support rod; 5. End support rod; 5-1. Socket. DETAILED DESCRIPTION

[0042] The present invention discloses a carburizing micro-deformation clamping method and a clamping device for thin-walled large inner hole flat gears, which clamp thin-walled large inner hole flat gears in a string hanging manner. Meanwhile, an empirical formula for such gear string hanging support is found through experience and actual verification:

[0043] Where r is the radius of the center hole of the thin-walled large inner hole flat gear;

[0044] like Figure 2As shown, the distance A between the two supporting points of the hanging rod on the circumferential surface of the gear center hole is the side length of the inscribed regular quadrilateral F of the gear center hole, and the supporting point of the center hole 101 of the thin-walled large inner hole flat gear 100 is determined. It is sufficient to select a suitable hanging rod to hang the thin-walled large inner hole flat gear 100, so that the hanging rod can hang the center hole 101 horizontally at the supporting point with the above distance A. Experiments have shown that this hanging method can effectively reduce the problem of the center hole 101 being out of round after carburizing of the thin-walled large inner hole flat gear 100, and thus reduce the distortion of the gear tooth profile.

[0045] Since this type of thin-walled flat gear 100 with a large inner hole has a thin-walled structure, although the string-hanging clamping is more conducive to suppressing the plane warping deformation of the gear than the flat-laying clamping, it is found in actual testing that the plane warping deformation of the thin-walled flat gear 100 with a large inner hole after carburizing is still greater than 0.5mm when only the string-hanging method is used, and the plane warping deformation will also cause tooth shape distortion. For this reason, the present invention adds positioning constraints on the end faces of the thin-walled flat gear 100 with a large inner hole on the basis of the above-mentioned string-hanging design, that is, Figure 7 As shown, the end faces of both sides of the thin-walled large inner hole flat gear 100 are clamped and fixed by end face fixing rods 2 respectively. After the end faces of both sides of the thin-walled large inner hole flat gear 100 are clamped, the plane warping deformation is within 0.1mm, and the purpose of carburizing micro-deformation of the thin-walled large inner hole flat gear is achieved.

[0046] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.

[0047] [Example]

[0048] Combination Figure 7 As shown, a carburizing micro-deformation clamping method for thin-walled large inner hole flat gears in this embodiment includes two parts: workpiece string hanging fixation and workpiece end face fixation, wherein:

[0049] Workpiece hanging and fixing: The center hole 101 of the thin-walled large inner hole flat gear 100 is hung on the horizontal hanging rod 1. The horizontal hanging rod 1 has two supporting points on the circumference of the center hole 101, and the distance A between the two supporting points of the horizontal hanging rod 1 on the circumference of the center hole 101 is calculated by the following formula:

[0050] Where r is the radius of the center hole 101 of the thin-walled large inner hole flat gear 100;

[0051] When the radius r of the center hole 101 of the thin-walled large inner hole flat gear 100 is known, the distance A between the two support points can be calculated, and then the horizontal string hanging rod 1 that can meet the above support design requirements can be selected;

[0052] Workpiece end face fixing: After the workpiece is hung and fixed, the upper and lower end faces of the thin-walled large inner hole flat gear 100 are clamped and fixed with end face fixing rods 2, and the upper and lower end face fixing rods 2 are respectively located within the ring width ΔR of the thin-walled large inner hole flat gear 100, ΔR is the difference between the outer circle radius R1 of the thin-walled large inner hole flat gear 100 and the radius R2 of the center hole 101; the upper two side ends of the thin-walled large inner hole flat gear 100 are clamped with two end face fixing rods 2, and the lower two side ends are also clamped with two end face fixing rods 2, so that the left and right sides of the thin-walled large inner hole flat gear 100 are fixed.

[0053] The above-mentioned clamping method is adopted to clamp the thin-walled large inner hole flat gear in a string hanging manner, and through the reasonable setting of the horizontal string hanging rod, the support of the string hanging rod to the thin-walled large inner hole flat gear reaches the best state. Experiments have proved that it can effectively prevent the inner hole of the gear from losing roundness after carburizing, and greatly reduce the distortion of the tooth shape; at the same time, the end faces of both sides of the thin-walled large inner hole flat gear are clamped and fixed with end face fixing rods respectively, and the string hanging clamping is combined to effectively prevent the plane warping of such gears, further prevent the distortion of the tooth shape, and improve the dimensional accuracy of the thin-walled large inner hole flat gear after carburizing.

[0054] Preferably, the above-mentioned horizontal string hanging rod 1 is fixed by at least two heat-resistant round rods, and the arc surface of the heat-resistant round rod is used for string hanging support on the circumferential surface of the center hole 101. The heat-resistant round rod can be made of heat-resistant steel, and the round rod contacts the circumferential surface of the center hole 101 with an arc, which makes the support of the gear center hole 101 more stable, and can prevent the horizontal string hanging rod 1 from wearing the circumferential surface of the gear center hole. The heat-resistant round rods in the horizontal string hanging rod 1 are preferably fixedly connected by spot welding to prevent the round rods from sliding. After calculating the distance A between the two outermost support points, round rods of appropriate sizes are selected to combine to form the horizontal string hanging rod 1. The heat-resistant round rods are easy to obtain, and the horizontal string hanging rod 1 has a simple structure and is easy to manufacture. The diameter of the round rods required to form the horizontal string hanging rod 1 can be converted according to the number of round rods and the distance A, and the number of round rods can be flexibly set according to needs, such as Figure 3 Shown is a horizontal string hanging rod 1 consisting of two round rods. Figure 4 Shown is a horizontal string hanging rod 1 consisting of three round rods. Figure 6 The horizontal string hanging rod 1 is composed of four round rods. The diameters of the round rods can be the same or different. Figure 5 The horizontal string hanging rod 1 is shown as composed of three round rods of different diameters. Under the condition of meeting the above string hanging requirements, the horizontal string hanging rod 1 can be flexibly combined according to specific needs. It should be noted that when more than two round rods are used to form the string hanging rod, the middle round rod cannot contact the circumferential surface of the center hole 101; two round rods can be used at the outermost side, and the two round rods are spot welded together by other rods to ensure that the center hole 101 is always supported by the two outermost round rods.

[0055] In this embodiment, the end face fixing rod 2 is also preferably made of a heat-resistant round rod, and the end face fixing rod 2 is horizontally arranged on the upper and lower sides of the end face of the thin-walled large inner hole flat gear 100, and is respectively located at half of the ring width ΔR on the upper and lower sides of the end face of the thin-walled large inner hole flat gear 100, so that the end face clamping of the thin-walled large inner hole flat gear 100 can be more stable, and the warping deformation of the gear plane can be further reduced. The use of heat-resistant round rods to clamp the end face of the workpiece has a small coverage area on the gear end face, which minimizes the impact on the carburization of the gear surface.

[0056] Based on the above clamping method, this embodiment also relates to a thin-walled large inner hole flat gear carburizing micro-deformation clamping device. Figure 8 and Fig. 9 As shown, the clamping device includes a horizontal hanging rod 1, an end surface fixing rod 2, a frame 3, a hanging support rod 4 and an end surface support rod 5. The hanging support rod 4 is horizontally spaced on the frame 3 in a plurality of layers along the height direction. At least two hanging support rods 4 of each layer are arranged in parallel on the frame 3. Both ends of the horizontal hanging rod 1 are positioned and installed on the hanging support rods 4 of each layer. Each horizontal hanging rod 1 has two supporting points on the circumferential surface of the center hole 101 of the thin-walled large inner hole flat gear 100, and the distance between the two supporting points of the horizontal hanging rod 1 on the circumferential surface of the center hole 101 is In the formula, r is the radius of the center hole 101 of the thin-walled large inner hole flat gear 100; the end face support rod 5 is fixed on the frame 3 perpendicularly to the hanging support rod 4, and the two ends of the end face fixing rod 2 are respectively detachably mounted on the end face support rod 5 on the corresponding side, and the end faces of the thin-walled large inner hole flat gear 100 hung on the hanging support rod 4 are provided with end face support rods 5 on the upper and lower sides, and the upper and lower end face fixing rods 2 are both located within the ring width ΔR of the thin-walled large inner hole flat gear 100.

[0057] Further, to facilitate the clamping operation, the above-mentioned end face fixing rod 2 is a "U"-shaped rod made of a heat-resistant round bar. A plurality of jacks 5-1 are provided on the end face support rod 5, and the two ends of the end face fixing rod 2 are respectively inserted and fixed in the jacks 5-1 of the end face support rod 5 on the corresponding side. With the above design of the end face fixing rod 2, the structure design is simple, the installation and disassembly are convenient, and the clamping of the workpiece end face is stable and reliable. Preferably, the end face fixing rods 2 are respectively located at the midpoints of the ring widths ΔR on the upper and lower sides of the end face of the thin-wall large-inner-hole spur gear 100, which can make the clamping of the end face of the thin-wall large-inner-hole spur gear more stable and further reduce the warping deformation of the gear plane. Specifically, in the same hanging layer, a string-hanging support rod 4 can be provided on each of the opposite sides of the frame 3, and end face support rods 5 can be provided on the other pair of opposite sides of the frame 3. One end face support rod 5 is provided above and below the string-hanging support rod 4. The thin-wall large-inner-hole spur gears 100 are sequentially threaded onto the horizontal string-hanging rod 1, and then the horizontal string-hanging rod 1 is positioned and installed perpendicular to the string-hanging support rod 4. Then, the end face fixing rods 2 are respectively vertically installed on the upper and lower groups of end face support rods 5, so that the upper and lower ends of the two end faces of each thin-wall large-inner-hole spur gear 100 are fixed by the end face fixing rods 2. The horizontal string-hanging rod 1 fixes the thin-wall large-inner-hole spur gears 100 up and down, and the end face fixing rods 2 fix the thin-wall large-inner-hole spur gears 100 left and right.

[0058] Similarly, the horizontal string-hanging rod 1 is fixed by at least two heat-resistant round bars, and adjacent heat-resistant round bars are fixedly connected by spot welding. A plurality of positioning grooves are provided at intervals on the string-hanging support rod 4, and the two ends of the horizontal string-hanging rod 1 are positioned and placed in the corresponding positioning grooves of the string-hanging support rod 4, realizing the positioning of the horizontal string-hanging rod 1 and preventing the horizontal string-hanging rod 1 from sliding.

[0059] The above-mentioned frame 3 is preferably a rectangular frame structure. A plurality of layers of string-hanging support rods 4 are provided on the frame 3. A plurality of rows of horizontally arranged horizontal string-hanging rods 1 are provided on each layer of string-hanging support rods 4, and a plurality of thin-wall large-inner-hole spur gears 100 are hung at intervals on each horizontal string-hanging rod 1. With the above frame structure design, more layers of workpieces can be clamped at one time, and the clamping operation is simple and convenient, facilitating mass production.

[0060] A carburizing micro-deformation clamping method and clamping device for a thin-wall large-inner-hole spur gear in this embodiment can effectively prevent the inner hole of the gear from becoming out-of-round and the plane from warping after carburizing, greatly reducing the distortion of the tooth profile. The following are the deformation comparison data of workpieces after carburizing and quenching using different clamping methods (the carburizing and quenching processes are the same):

[0061]

[0062] From the above experimental comparison, it can be seen that the clamping method and clamping device of the present invention can improve the accuracy of thin-walled large inner hole flat gears after carburizing and quenching in three aspects: inner hole out-of-round deformation, plane warping deformation and tooth shape distortion, thereby solving the difficult problem of heat treatment deformation of such thin-walled large inner hole flat gears.

[0063] The present invention discloses a carburizing micro-deformation clamping method and a clamping device for thin-walled large inner hole flat gears. The thin-walled large inner hole flat gears are clamped in a string hanging manner, and the horizontal string hanging rods are reasonably arranged to achieve the best support for the thin-walled large inner hole flat gears by the string hanging rods. Experiments have shown that the inner hole of the gear can be effectively prevented from being out of round after carburizing, and the distortion of the tooth shape is greatly reduced. At the same time, the end faces of both sides of the thin-walled large inner hole flat gears are clamped and fixed by end face fixing rods respectively, and the string hanging clamping is combined to effectively prevent the plane warping of such gears, further prevent the distortion of the tooth shape, and improve the dimensional accuracy of the thin-walled large inner hole flat gears after carburizing.

[0064] The present invention and its embodiments are described schematically above, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and creatively designs a structure and an embodiment similar to the technical solution without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A carburizing micro-deformation clamping device for thin-walled large inner hole flat gears, characterized in that: It includes a horizontal hanging rod (1), an end face fixing rod (2), a frame (3), a hanging support rod (4) and an end face support rod (5). The hanging support rods (4) are horizontally arranged in several layers at intervals along the height direction on the frame (3), and at least two hanging support rods (4) are arranged in parallel on the frame (3) for each layer. The two ends of the horizontal hanging rod (1) are positioned and installed on the hanging support rods (4) of each layer. Each horizontal hanging rod (1) has two support points on the circumferential surface of the central hole (101) of the thin-walled large-inner-hole spur gear (100), and the distance between the two support points of the horizontal hanging rod (1) on the circumferential surface of the central hole (101) , where r is the radius of the central hole (101) of the thin-walled large-inner-hole spur gear (100); the horizontal hanging rod (1) is fixed by at least two heat-resistant round bars, and adjacent heat-resistant round bars are fixedly connected by spot welding; the end face support rod (5) is fixedly installed on the frame (3) perpendicular to the hanging support rod (4). The two ends of the end face fixing rod (2) are respectively detachably installed on the end face support rods (5) on the corresponding sides. End face support rods (5) are provided above and below both end faces of the thin-walled large-inner-hole spur gear (100) hung on the hanging support rods (4), and the upper and lower end face fixing rods (2) are both located within the ring width ΔR of the thin-walled large-inner-hole spur gear (100), and the end face fixing rods (2) are respectively located at the midpoint of the ring width ΔR above and below the end faces of the thin-walled large-inner-hole spur gear (100); the end face fixing rod (2) is a "U"-shaped rod made of heat-resistant round bar. A number of jacks (5-1) are provided on the end face support rod (5). The two ends of the end face fixing rod (2) are respectively inserted and fixed in the jacks (5-1) of the end face support rods (5) on the corresponding sides to clamp and fix the upper and lower sides of the two end faces of the thin-walled large-inner-hole spur gear.

2. The carburizing micro-deformation clamping device for thin-walled large inner hole flat gears according to claim 1 is characterized in that: A plurality of positioning grooves are arranged at intervals on the string hanging support rod (4), and the two ends of the horizontal string hanging rod (1) are positioned and placed in the corresponding positioning grooves of the string hanging support rod (4).

3. The carburizing micro-deformation clamping device for thin-walled large inner hole flat gears according to claim 1, characterized in that: The frame (3) is a rectangular frame structure. The frame (3) is provided with multiple layers of string-hanging support rods (4). Each layer of string-hanging support rods (4) is provided with multiple rows of parallel horizontal string-hanging rods (1). Multiple thin-walled flat gears (100) with large inner holes are hung at intervals on each horizontal string-hanging rod (1).

4. A clamping method for the carburizing micro-deformation clamping device for thin-walled large inner hole flat gears according to claim 1, characterized in that: It includes two parts: workpiece string fixing and workpiece end face fixing. Workpiece hanging and fixing: The center hole (101) of the thin-walled large inner hole flat gear (100) is hung on the horizontal hanging rod (1), and the horizontal hanging rod (1) has two supporting points on the circumference of the center hole (101), and the distance between the two supporting points of the horizontal hanging rod (1) on the circumference of the center hole (101) is A Calculated by the following formula: , where r is the radius of the center hole (101) of the thin-walled large inner hole flat gear (100); Workpiece end face fixing: After the workpiece is fixed by stringing, the upper and lower end faces of the thin-walled large inner hole flat gear (100) are clamped and fixed by end face fixing rods (2), the end face fixing rods (2) are made of heat-resistant round rods, and the upper and lower end face fixing rods (2) are respectively located at the ring width of the thin-walled large inner hole flat gear (100). ΔR Within the range, ΔR The outer radius of the thin-walled flat gear with large inner hole (100) R 1 Radius of center hole (101) R 2 The end face fixing rod (2) is horizontally arranged on both sides of the upper and lower ends of the thin-walled large inner hole flat gear (100), and is respectively located at the ring width of the upper and lower ends of the thin-walled large inner hole flat gear (100) ΔR One-half of .

Images