A control mold for deforming a ring gear

Abstract

The application discloses a gear ring deformation control mold, which comprises an inner mold, a plurality of support seats distributed along the circumference of the inner mold, the support seat comprising a support part, a connecting plate and a transition plate assembly, the transition plate assembly being installed on the inner mold, the support part being detachably installed on the connecting plate, the support part being capable of sliding along the axial direction of the inner mold relative to the connecting plate, and the surface of the side of the support part away from the connecting plate being arc-shaped. The gear ring deformation control mold has the advantages that the arc-shaped structure of the support part is better matched with the inner wall of the gear ring through the arrangement of the plurality of support seats, the range of the applicable gear ring is wider through the small-amplitude movement of the support part relative to the connecting plate, the gear ring is not limited by the diameter and width of the gear ring, and the size stability of the mold, the rigidity and precision of the mold in the deformation control process are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gear ring processing, in particular to a gear ring deformation control mold. BACKGROUND

[0002] With the rapid development of modern industry, the deformation control of workpiece heat treatment gradually becomes the main index to measure the quality of heat treatment, especially the deformation control of carburizing and quenching of large gear ring. Carburizing and quenching is the most widely used heat treatment method in the gear industry, which has the best comprehensive performance such as surface hardness, wear resistance, contact and bending fatigue strength. However, due to the effects of pre-machining stress, heating thermal stress and organizational transformation stress, irregular deformation will occur when the workpiece is heated, cooled and carburized for a long time, which seriously affects the product quality.

[0003] In the prior art, the control of carburizing and quenching heat treatment deformation mostly depends on the improvement of correction mold and deformation control process method. However, the existing deformation control process method has small application range and is easily limited by the diameter and height of the gear ring. The precision, operability, applicability, mold strength and the degree of fit between the mold and the gear ring of the existing deformation control mold still have many deficiencies.

[0004] Therefore, how to effectively improve the stability of the gear ring deformation control mold is a technical problem to be solved by those skilled in the art at present. SUMMARY

[0005] The purpose of the present application is to provide a gear ring deformation control mold for reducing the deformation degree of the gear ring during processing and ensuring the processing precision of the gear ring.

[0006] To achieve the above purpose, the present application provides the following technical scheme:

[0007] A gear ring deformation control mold comprises:

[0008] An inner mold;

[0009] A plurality of support seats are distributed along the circumference of the inner mold; the support seat comprises a support component, a connecting plate and a transition plate assembly, the transition plate assembly is installed on the inner mold, the support component is detachably installed on the connecting plate, the support component can slide along the axial direction of the inner mold relative to the connecting plate, and the side surface of the support component away from the connecting plate is an arc surface.

[0010] Preferably, a hardening layer is arranged on the side surface of the support component away from the connecting plate.

[0011] Preferably, the number of support seats is 9-16, which are uniformly distributed along the circumference of the inner mold.

[0012] Preferably, the inner mold is provided with a plurality of support arms in the circumferential direction, and the support seats are mounted on the support arms.

[0013] Preferably, the inner mold and the support arms are integrated.

[0014] Preferably, the support components and the coupling plates are connected by means of countersunk screws, and the support components are provided with countersunk screw holes for the countersunk screws.

[0015] Preferably, the transition plate assembly includes a first transition plate, a second transition plate, and a plurality of adjustment blocks between the first transition plate and the second transition plate, and the number or size of the adjustment blocks is adjustable to adjust the distance between adjacent two transition plates.

[0016] Preferably, the first transition plate and the second transition plate are detachably connected by means of a screw rod, and the screw rod can penetrate the first transition plate, the adjustment blocks, and the second transition plate.

[0017] Preferably, the positioning pin is further provided, one end of the positioning pin is fixedly arranged on the inner mold, and the first transition plate is provided with a positioning hole or a positioning groove matched with the positioning pin.

[0018] Preferably, each of the support seats includes a plurality of coupling plates and support components, each of the coupling plates is provided with at least one support component, and the coupling plates are arranged in the axial direction of the inner mold.

[0019] The ring gear deformation control mold provided by the application includes an inner mold, a plurality of support seats distributed in the circumferential direction of the inner mold, the support seats include support components, coupling plates, and a transition plate assembly, the transition plate assembly is mounted on the inner mold, the support components are detachably mounted on the coupling plates, the support components can slide in the axial direction of the inner mold relative to the coupling plates, and the side surface of the support components away from the coupling plates is an arc surface. The ring gear deformation control mold provided by the application is provided with a plurality of support seats, and the arc surface structure of the support components is used to better match the inner wall of the ring gear. The small amplitude movement of the support components relative to the coupling plates can be used to adapt to a wider range of ring gears, and the size of the ring gear diameter and width is not limited. At the same time, the size stability of the mold, the rigidity of the mold in the deformation control process, and the precision are improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to make the technical scheme of the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only need to explain the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative work.

[0021] Figure 1 A structural schematic diagram of a specific embodiment of the gear ring deformation control mold provided by the present application is shown in the figure.

[0022] Figure 2 A structural schematic diagram of a specific embodiment of the gear ring deformation control mold provided by the present application is shown in the figure. Figure 1 A structural schematic diagram of a specific embodiment of the gear ring deformation control mold provided by the present application is shown in the figure.

[0023] In the figure, support part-1, countersunk screw-2, coupling plate-3, transition plate assembly-4, first transition plate-5, second transition plate-6, screw-7, connecting screw-8, adjusting block-9, positioning pin-10, bottom screw-11, inner mold-12, bottom plate-13. DETAILED DESCRIPTION

[0024] The core of the present application is to provide a gear ring deformation control mold, which can effectively control and correct the carburizing and quenching deformation of a large gear ring.

[0025] In order to make the technical scheme of the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only need to explain the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative work.

[0026] Please refer to Figure 1 and Figure 2 , Figure 1 A structural schematic diagram of a specific embodiment of the gear ring deformation control mold provided by the present application is shown in the figure. Figure 2 A structural schematic diagram of a specific embodiment of the gear ring deformation control mold provided by the present application is shown in the figure. Figure 1 A structural schematic diagram of a specific embodiment of the gear ring deformation control mold provided by the present application is shown in the figure.

[0027] In this embodiment, the gear ring deformation control mold comprises:

[0028] The inner mold 12; a plurality of support seats, the support seats are distributed along the circumference of the inner mold 12; specifically, the inner mold 12 is annular, the inner mold 12 serves as the support main body of the gear ring deformation control mold, and each support seat is preferably uniformly distributed along the circumference of the inner mold 12 to ensure balanced force acting on the gear ring; the size of the inner mold 12 and the support seat can be determined according to the actual inner hole size of the gear ring part to determine the final outer diameter size of the gear ring deformation control mold.

[0029] The support base includes a support component 1, a connecting plate 3, and a transition plate assembly 4. The transition plate assembly 4 is mounted on the inner mold 12. The support component 1 is detachably mounted on the connecting plate 3. The support component 1 can slide relative to the connecting plate 3 along the axial direction of the inner mold 12, thereby correcting internal gear rings with different tooth widths. The side surface of the support component 1 facing away from the connecting plate 3 is an arc surface. The support component 1 can be a support plate or a support block. The support component 1 directly contacts the inner wall of the gear ring. The surface curvature of the support component 1 is preferably the same as the curvature of the inner wall of the gear ring so that the surface of the support component 1 fits better with the inner wall of the gear ring. The connecting plate 3 is preferably an inverted mountain-shaped structure. The connecting plate 3 is provided with at least two grooves. The bottom of the groove is provided with a strip hole. The support component 1 is connected to the bottom of the groove by a countersunk screw 2. After the countersunk screw 2 is loosened, it can slide along the strip hole to realize the sliding of the support component 1 along the axial direction of the inner mold 12, thereby adapting to gear rings of different widths. The structural design of the connecting plate 3 can reduce the weight on the one hand, and reduce the opening thickness of the strip hole on the other hand, which facilitates processing. The countersunk screw 2 can penetrate the threaded hole and extend into the groove of the connecting plate 3.

[0030] The gear ring deformation control mold provided by the present invention, through the setting of several support seats, utilizes the arc surface structure of the support component 1 to better match the inner wall of the gear ring, and through the small-amplitude movement of the support component 1 relative to the connecting plate 3, it is applicable to a wider range of gear rings, and is not limited by the diameter and width of the gear ring. At the same time, it improves the dimensional stability of the mold, the rigidity and accuracy of the mold during the deformation control process.

[0031] In some embodiments, a hardened layer is provided on the surface of the support member 1 facing away from the connecting plate 3. Specifically, the support surface of the support member 1 is surface hardened to reduce the extrusion deformation of the support surface during the correction process, thereby increasing the hardness of the surface of the support member 1 and thus improving the durability of the support surface.

[0032] In some embodiments, the number of support seats is 9-16, evenly distributed along the circumference of the inner mold 12. Specifically, when the number of support seats is too large, it is inconvenient to load and unload the mold; when the number of support seats is too small, the deformation control effect is not good. Therefore, it is preferable to use 9-16 support seats, which is easy to manufacture and can achieve a good deformation control effect.

[0033] In some embodiments, the inner mold 12 is provided with a plurality of support arms in the circumferential direction, and the support base is installed on the support arms. The provision of support arms can facilitate the installation of the support base and improve the connection strength between the support base and the inner mold 12, thus ensuring stability.

[0034] In some embodiments, the inner mold 12 and the support arm are an integral structure with high strength and easy processing, and can be integrally formed by casting.

[0035] In some embodiments, the support component 1 and the connecting plate 3 are connected by the countersunk screw 2, the support component 1 is provided with a countersunk screw 2 hole for the countersunk screw 2, and the countersunk screw 2 and the countersunk screw 2 hole are matched to avoid the influence of the countersunk screw 2 on the surface of the support component 1 and the interference with the inner wall of the gear ring.

[0036] In some embodiments, the transition plate assembly 4 includes a first transition plate 5, a second transition plate 6, and a plurality of adjustment blocks 9 between the first transition plate 5 and the second transition plate 6, and the number or size of the adjustment blocks 9 can be adjusted to adjust the distance between the two adjacent transition plates. Specifically, when a small adjustment of the position of the support component 1 is needed, the size of the adjustment block 9 can be changed to fine-tune the mold size without being affected by the curvature radius of the support component 1 and the part, and when a large adjustment is needed, different sizes of the support component 1 can be replaced to match the curvature radius of the part, so that the same mold can be used to correct parts of different sizes, achieving one mold for multiple uses. In order to ensure the size accuracy of the mold, the size of the support component 1 is processed after the parts are combined, so that the size of the mold has good repeatability; during repeated use, the position of each support component 1 changes little, so the size accuracy of the entire mold decreases less, and the mold can be reused without reducing the size stability.

[0037] In some embodiments, the first transition plate 5 and the second transition plate 6 are detachably connected by the screw rod 7, the screw rod 7 can penetrate the first transition plate 5, the adjustment block 9 and the second transition plate 6, the first transition plate 5, the adjustment block 9 and the second transition plate 6 are combined, the connecting plate 3 is installed on the second transition plate 6, and the connection can be realized by the connecting screw 8 and the connecting nut, and then the support component 1 is installed on the connecting plate 3; in order to improve the connection strength, the connecting screw 8 can penetrate the second transition plate 6 and be connected to the first transition plate 5.

[0038] In some embodiments, the positioning pin 10 is further included, one end of the positioning pin 10 can be fixedly arranged on the inner mold 12; the first transition plate 5 is provided with a positioning hole or a positioning groove matched with the positioning pin 10, and the positioning pin 10 can improve the positioning accuracy of the first transition plate 5 and facilitate quick installation.

[0039] In some embodiments, the first transition plate 5 and the support arm are further provided with a bottom plate 13, the bottom plate 13 is fixedly arranged on the inner mold 12 by the bottom screw 11; the bottom plate 13 can facilitate the installation of the entire support seat and ensure the accuracy.

[0040] In some embodiments, each support seat includes a plurality of connecting plates 3 and support components 1, at least one support component 1 can be installed on each connecting plate 3, and the connecting plates 3 are arranged along the axial direction of the inner mold 12, thereby meeting the processing requirements of gear rings of different thicknesses and improving the size stability.

[0041] Specifically, during processing, the gear ring is placed flat on a multi-point supported base lifting device, heated and quenched in a furnace, the temperature is 30-50℃ above Ac3 or Ac1, the gear ring generates heat treatment transformation according to the characteristics of its material, that is, the metallographic structure is transformed, and then the size is changed.

[0042] The process is:

[0043] pad - furnace - temperature - quenching - mold - quenching medium - first tempering - demolding - second tempering.

[0044] Specifically, the following steps are included:

[0045] Step S1: The gear ring is placed flat on the base, supported by multiple points, preferably 6-16 support points, the more support points, the smaller the force on each support point, which can effectively reduce the warping deformation, and after the pad is placed stably, it is heated and quenched in the furnace together;

[0046] Step S2: The temperature can be raised in stages, and the temperature can be raised, that is, it can be uniformly heated at 600-680℃ for 2-6h to reduce stress and deformation during heat treatment;

[0047] Step S3: Then heat to 30-50℃ above Ac3 or Ac1 for quenching treatment to make the gear ring change its structure, and after uniform heating for a sufficient time, generally 2-6h, the gear ring is taken out of the furnace with the mold and quenched in the medium;

[0048] Step S4: The heated gear ring and base lifting device in the heat treatment furnace are lifted out of the furnace, and the mold is immediately placed in the inner hole of the gear ring, then immediately quenched in the cooling medium (oil or nitrate salt), and at the same time, the medium is stirred to cool uniformly and reduce deformation; During the quenching and cooling process, as the temperature of the gear ring decreases, the inner and outer circles of the gear ring shrink, while the mold is in a cold state and has high strength, so the size does not change; Thin-walled gear rings will produce irregular deformation during heating and cooling, and the inner circle will adhere to the support part 1 of the mold at different times due to shrinkage, and since the mold does not change in size, the irregular deformation of the gear ring is effectively controlled.

[0049] Step S5: The quenched gear ring with the base lifting device and the mold is kept in the state after quenching and molding, and is lifted into the heating furnace at 300-160℃ for low temperature tempering, which aims to eliminate the quenching stress; Eliminate the different internal stresses generated by the different support forces of the mold due to the irregular deformation of the thin-walled large gear ring, and play a role in stabilizing the size of the thin-walled large gear ring;

[0050] Step S6: After low-temperature stress relief tempering, the gear ring on the base lifting tool and the mold are lifted out of the heating furnace and cooled to 100℃-room temperature in air, the support block is gas cut, and the mold is in a relaxed state so as to easily lift the mold out of the gear ring, and the quenching deformation control process is completed;

[0051] Step S7: low-temperature stress relief tempering again, more complete organization transformation, sufficient elimination of quenching stress (stress generated during mold release and demolding process) and reduction of residual austenite amount, and stabilization of gear ring size.

[0052] The gear ring deformation control mold increases the contact area of the mold and the gear ring by designing the support points of the tool as multi-petal supports, i.e., designing the number of supports according to the size of the gear ring diameter, and follows the principle of: minimizing the support arc length of each petal and increasing the support point position to reduce the influence of mismatched curvature radius; the mold size can be adjusted by adjusting the size of the adjusting block 9 in a small range, and the size adjustment in a large range is realized by replacing support plates with different curvature radii; the height and the number of stacked parts are relaxed, one or more parts can be processed at the same time, and the height of the gear ring is not limited, large-scale gear rings with a height of >100 mm can be processed as single or multiple parts at the same time, one mold is used for multiple purposes, and the applicable diameter and height range is wider; the precision is high, the circular surface of the support plate is designed to be closer to the gear ring structure, the surface of the support plate can be hardened, such as surface quenching, to improve the strength of the mold to cope with the release of heat treatment stress and extrusion deformation, improve the durability of the support surface and the service life of the mold, the surface hardening treatment of the support surface of the support plate improves the strength of the mold and reduces the deformation; the demolding process is fast and convenient, and the adjusting block 9 is gas cut to demold.

[0053] The gear ring deformation control mold provided by the present application is described in detail above. In this paper, specific examples are applied to describe the principles and implementation modes of the present application, and the above examples are only used to help understand the method and core idea of the present application. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A control mold for ring gear deformation, characterized by, The utility model relates to a kind of support seat for inner mold, comprising: Inner mold (12); Several support seats are distributed along the circumference of the inner mold (12);The support seat includes a support component (1), a coupling plate (3) and a transition plate assembly (4), the transition plate assembly (4) is installed on the inner mold (12), the support component (1) is detachably installed on the coupling plate (3), the support component (1) can slide along the axial direction of the inner mold (12) relative to the coupling plate (3), and the side surface of the support component (1) away from the coupling plate (3) is arc surface; The transition plate assembly (4) includes a first transition plate (5), a second transition plate (6) and several adjusting blocks (9) between the first transition plate (5) and the second transition plate (6), the number or size of the adjusting block (9) is adjustable to adjust the distance between adjacent two transition plates; The first transition plate (5) and the second transition plate (6) are detachably connected by a screw rod (7), and the screw rod (7) can penetrate the first transition plate (5), the adjusting block (9) and the second transition plate (6); It also includes a positioning pin (10), one end of the positioning pin (10) can be fixed on the inner mold (12), and the first transition plate (5) is provided with a positioning hole or a positioning groove matched with the positioning pin (10).

2. The deformation control mold for a ring gear according to claim 1, characterized by, The side surface of the support component (1) away from the coupling plate (3) is provided with a hardened layer.

3. The deformation control mold for a toothed ring according to claim 1, characterized in that, The number of support seats is 9-16, and they are evenly distributed along the circumference of the inner mold (12).

4. The deformation control mold for a toothed wheel according to claim 1, characterized in that, The inner mold (12) is provided with several support arms along the circumference, and the support seat is installed on the support arm.

5. The deformation control mold for a toothed wheel according to claim 4, characterized in that The inner mold (12) and the support arm are an integral structure.

6. The deformation control mold for a toothed wheel according to claim 1, characterized in that The support component (1) and the coupling plate (3) are connected by a countersunk screw (2), and the support component (1) is provided with a countersunk screw (2) hole for the countersunk screw (2).

7. The deformation control mold for a toothed ring according to any one of claims 1 to 6, characterized in that, Each support seat includes several coupling plates (3) and support components (1), each coupling plate (3) can be installed at least one support component (1), and each coupling plate (3) is arranged along the axial direction of the inner mold (12).

Images