Shot blasting strengthening tool for sheet gear

Abstract

The utility model relates to a tool used for shot blasting strengthening of a gear, in particular to a shot blasting strengthening tool for a sheet gear, and aims to solve the problem that the production efficiency is greatly reduced due to the lack of universality of the conventional shot blasting strengthening tool for the gear. The device comprises a bottom plate, a plurality of mounting stand columns arranged on the lower surface of the bottom plate, a supporting stand column vertically arranged on the bottom plate, and a left group of supporting rings and a right group of supporting rings which are horizontally arranged on the supporting stand column through fixing rods from top to bottom. The supporting ring adopts the design that an inner ring and an outer ring are connected through a fixing rod to guarantee the same supporting effect on gears of different sizes, and a supporting ball is arranged on the fixing rod to achieve point contact supporting of the gear to be machined. A pluggable and replaceable positioning mandrel is mounted on the inner ring of the supporting ring so as to position gears with different inner hole sizes; according to the utility model, the universality of the tool can be effectively improved, and the production efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to a tooling used for shot blasting strengthening of gears, specifically a tooling for shot blasting strengthening of plate gears. Background Technology

[0002] Shot blasting is a surface treatment method that uses high-speed shot to continuously impact the surface of a part, causing cyclic plastic deformation and introducing residual compressive stress, thereby improving the part's fatigue resistance and stress corrosion resistance. After carburizing and quenching heat treatment, parts are usually first shot blasted to remove residual impurities and burrs to improve surface finish; then shot blasting is performed to improve fatigue resistance. Both processes use shot blasting, where steel shot is propelled by a shot blasting machine to impact the part surface to achieve the desired effect. Depending on the equipment, process parameters, and steel shot properties, different shot blasting effects can be produced. Therefore, during shot blasting, the steel shot impacts the part surface, introducing a residual stress field while simultaneously cleaning the surface.

[0003] The main purpose of shot blasting for gears is to generate residual compressive stress at the tooth root, thereby improving their fatigue resistance and stress corrosion resistance. Therefore, shot blasting of gears typically employs a horizontal cascade method, with the shot direction perpendicular to the gear's axis and the gear end faces in contact for optimal strengthening. However, during shot blasting, the shot cannot impact the contact end faces, inner bores, or other internal obstructing structures of the gear, thus failing to clean these obstructed surfaces. Chinese patent CN220944851U discloses a gear cleaning-free ring-type strengthening fixture, which includes two sets of left and right annular supports mounted on a chassis via columns, and multiple locating pins evenly arranged circumferentially on the annular supports for point contact support of the gear. This type of fixture can minimize the contact area between the annular supports and the gear, and increase the exposed area of ​​the gear end face and inner hole, thereby ensuring the cleaning and strengthening effect of shot blasting. However, this fixture lacks versatility and is only suitable for gears with external steps on the end face. Moreover, the size of the gear must be compatible with the size of the annular supports. When dealing with strengthening operations of different types of gears, it is necessary to replace the annular supports with those of different sizes, which leads to a significant increase in equipment and labor replacement costs and a significant reduction in production efficiency. Utility Model Content

[0004] The main purpose of this utility model is to solve the problem that the existing gear shot blasting strengthening tooling lacks versatility, resulting in a significant reduction in production efficiency, and to provide a new gear shot blasting strengthening tooling.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A shot blasting and strengthening fixture for a sprocket gear includes a base plate, multiple mounting columns disposed on the lower surface of the base plate, support columns vertically disposed on the upper surface of the base plate, and two sets of left and right support rings horizontally disposed on the support columns from top to bottom via fixing rods; the distance between two adjacent support rings in each set is greater than the maximum thickness of the sprocket gear to be processed.

[0007] Its special feature is:

[0008] Each of the aforementioned support rings includes a coaxially arranged outer support ring and an inner support ring, as well as multiple circumferentially distributed support ring connecting rods that connect the outer support ring and the inner support ring. The outer diameter of each outer support ring is adapted to the maximum addendum circle diameter of the gear to be processed. Each inner support ring has a pluggable positioning mandrel installed in its inner hole, and the diameter of the positioning mandrel is smaller than the inner hole diameter of the gear to be processed, for positioning the gear to be processed. There are multiple positioning mandrels, and the diameters of the multiple positioning mandrels are adapted to the inner hole diameter of the gear to be processed, for replacement when the inner hole diameter of the gear to be processed is different.

[0009] Each of the support ring connecting rods has multiple support balls of the same size arranged from the inside to the outside on its upper side, which are used to support the gear to be processed in a point contact manner; the distance between the support ball closest to the inner ring of the support ring and the center of the support ring is less than the minimum tip circle radius of the gear to be processed, thereby improving the versatility of the tooling.

[0010] Furthermore, the positioning mandrel includes a cylindrical mandrel body and two cylindrical mandrel mounting posts symmetrically fixed to the lower end face of the mandrel body. Let the bottom diameter of the mandrel body be D1 and the bottom diameter of the mandrel mounting posts be D2, then D1 > 2D2.

[0011] The inner ring of the support ring is provided with two mandrel fixing rings that are adapted to the bottom diameter of the mandrel mounting post; both mandrel mounting posts pass through the corresponding mandrel fixing rings, thereby fixing the positioning mandrel in the inner ring of the support ring; at this time, the lower surface of the mandrel body is higher than the plane where the top of the support ball is located.

[0012] Furthermore, there is a 3-5mm single-sided gap between the mandrel body and the inner hole of the gear to be processed, which is used to ensure that the inner hole wall can contact the steel shot while positioning the gear to be processed, thus ensuring the shot blasting strengthening effect.

[0013] Furthermore, the left and right sets of support rings are staggered in layer by layer, and the height difference L between one support ring in each set and two adjacent support rings in the other set is equal. If the thickness of the largest gear to be processed is H, then LH ≥ 5mm; thereby ensuring that both the upper and lower end faces of the gear to be processed can contact the steel shot for cleaning and strengthening.

[0014] Furthermore, each of the support rings is horizontally mounted on the support column by two fixing rods, and both fixing rods are tangentially connected to the support ring.

[0015] Furthermore, the base plate includes an integrally formed mounting circular plate and a support ear plate. Multiple mounting columns are fixedly installed on the lower surface of the mounting circular plate, and the minimum distance between each mounting column and the edge of the mounting circular plate is 10-15mm. The support columns are welded to the support ear plate, and the minimum distance between the support columns and the edge of the support ear plate is 5mm, which is used to balance the center of gravity of the tooling.

[0016] Furthermore, the angle θ between the horizontal line connecting the center of each support ring and the support column and the vertical midline of the base plate is equal, and 23°≤θ≤40°.

[0017] Furthermore, the distance between two adjacent support balls is equal.

[0018] Furthermore, the angle θ between the horizontal line connecting the center of each support ring and the support column and the vertical midline of the base plate is 35°.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. The present invention provides a shot blasting strengthening fixture for gears. By designing a staggered upper and lower support ring to support the gears, the end faces of the gears are not in contact or obstructed. Furthermore, by designing a single-sided gap between the positioning mandrel and the inner hole of the gear to be processed, the exposed area of ​​the gear to be processed is maximized, so that the steel shot can impact all exposed surfaces of the gear to be processed. While the tooth root is strengthened, the end face and inner hole are also cleaned, thus completing shot blasting cleaning and strengthening in one step.

[0021] 2. The present invention provides a shot blasting reinforcement fixture for a gear, which is adapted to gears of different sizes by combining inner and outer rings with a positioning mandrel; the outer ring diameter is designed according to the maximum tooth tip circle diameter, and the inner ring diameter is designed according to the minimum inner hole diameter of the gear to be processed, and is connected and fixed by a support ring connecting rod, thereby meeting the needs of gears of different specifications.

[0022] 3. The present invention provides a gear shot blasting strengthening fixture. In order to increase the applicability of the fixture and reduce its weight, the minimum distance between each mounting column and the edge of the mounting circular plate is 10-15mm. While ensuring the required welding dimensions, the diameter of the base plate is minimized as much as possible. The minimum distance between the support column and the edge of the support ear plate is 5mm. While ensuring the installation dimensions, the length of the ear plate is maximized to increase the distance between the support column and the gear to be shot blasted, thereby increasing the diameter of the applicable gear. Attached Figure Description

[0023] Figure 1This is a three-dimensional structural schematic diagram of an embodiment of the shot blasting strengthening tooling for a plate gear according to the present invention;

[0024] Figure 2 This is a schematic diagram of the main structure of an embodiment of the shot blasting and strengthening tooling for a gear according to the present invention;

[0025] Figure 3 This is a side view of an embodiment of the shot blasting and strengthening tooling for a gear according to the present invention.

[0026] Figure 4 This is a top view of an embodiment of the shot blasting and strengthening tooling for a gear according to the present invention (the positioning mandrel is not shown).

[0027] Figure 5 This is a schematic diagram of the main structure of the positioning mandrel in an embodiment of the shot blasting and strengthening tooling for a gear according to this utility model;

[0028] Figure 6 This is a bottom view of the positioning mandrel in an embodiment of the shot blasting and strengthening tooling for a plate gear according to this utility model;

[0029] Figure 7 This is a schematic diagram showing the installation position of the gear during operation of an embodiment of the shot blasting and strengthening tooling for a plate gear according to this utility model;

[0030] Explanation of reference numerals in the attached figures:

[0031] 1-Support ring; 11-Outer ring of support ring; 12-Inner ring of support ring; 13-Support ring connecting rod; 14-Mandrel fixing ring; 15-Support ball; 2-Base plate; 3-Mounting column; 4-Supporting column; 5-Fixing rod; 6-Positioning mandrel; 61-Mandrel body; 62-Mandrel mounting column. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] A shot blasting reinforcement fixture for gears, its three-dimensional structure is as follows: Figure 1 As shown, the fixture includes a base plate 2 consisting of a mounting circular plate and a support ear plate; two mounting columns 3 are fixedly installed on the lower surface of the mounting circular plate, and the minimum distance between each mounting column 3 and the edge of the mounting circular plate is 10-15mm; support columns 4 are welded to the support ear plate and extend above the support ear plate; the support ear plate is 80mm wide, and the distance between the support column 4 and the edge of the support ear plate is 5mm, thereby balancing the center of gravity of the fixture.

[0034] like Figure 2 , Figure 3As shown, the support column 4 is provided with two sets of support rings 1 arranged in staggered layers from top to bottom. Each set of support rings 1 has four rings, and the height difference L between any two adjacent support rings 1 and the thickness H of the largest gear to be processed supported on it both satisfy LH = 5mm.

[0035] like Figure 4 As shown, each support ring 1 is horizontally mounted on the support column 4 via two fixed rods tangentially connected to it. The distance between the center of the support ring 1 and the center of the support column 4 is 145mm, and the angle between the horizontal line connecting the center of the support ring 1 and the center of the support column 4 and the vertical midline of the base plate 2 is 35°. Each support ring 1 includes an outer support ring 11, an inner support ring 12, and three circumferentially distributed support ring connecting rods 13 connecting the outer support ring 11 and the inner support ring 12. The angle between any two adjacent support ring connecting rods 13 is 120°. Each support ring connecting rod 13 is provided with two support balls 15 of the same size, and the distances between the support balls 15 and the outer support ring 11, the inner support ring 12, and the adjacent support balls 16 are all equal, used to support the gear to be processed in point contact. The distance between the support ball 15 closest to the inner support ring 12 and the center of the support ring 1 is less than the minimum addendum circle diameter of the gear to be processed, thus ensuring the versatility of the tooling.

[0036] The outer diameter of each support ring outer ring 11 is adapted to the tip circle diameter of the largest gear to be processed; each support ring inner ring 12 is provided with two mandrel fixing rings 14; a replaceable positioning mandrel 6 is installed in the two mandrel fixing rings 14; the structure of the positioning mandrel 6 is as follows: Figure 5 , Figure 6 As shown, it includes a cylindrical mandrel body 61 and two cylindrical mandrel mounting posts 62 symmetrically fixed to the lower end face of the mandrel body 61. Let the bottom diameter of the mandrel body 61 be D1 and the bottom diameter of the mandrel mounting post 62 be D2, then D1 > 2D2, and the diameter of each mandrel mounting post 62 is adapted to the inner diameter of the mandrel fixing ring 14. The lower surface of the mandrel body 6 of each positioning mandrel 6 installed on the inner ring 12 of the support ring should be higher than the plane where the vertex of the support ball 15 is located. There is a 3-5mm single-sided gap between each mandrel body 61 and the inner hole of the gear to be processed. In practical applications, there are multiple positioning mandrels 6. The positioning mandrel 6 can be replaced with one that matches the size of the inner hole of the gear to be processed, so as to ensure that the inner wall of the gear to be processed can contact the steel shot while positioning the inner hole of the gear to be processed, thereby ensuring the strengthening effect.

[0037] During use, first, install this embodiment into the equipment suspension fixture, insert the mounting column 3 into its corresponding mounting hole, and make contact with and support the base plate 2 of the equipment suspension fixture; then place the gear to be processed on the support ring 1, as shown. Figure 7As shown, each gear to be processed is positioned using a positioning mandrel 6, and the support ball 15 supports the gear to be processed in a point contact manner, thereby minimizing the contact area between the end face of the gear to be processed and the support ball 15. After assembly, the assembled whole, namely the equipment suspension fixture, the shot blasting fixture described in this embodiment connected thereon, and the gear positioned in this embodiment, are sent into the shot blasting machine together, so that the gear to be processed can be directly shot blasted for strengthening.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. For those skilled in the art, modifications can be made to the specific technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions protected by this utility model.

Claims

1. A segment gear shot peening tooling, comprising a base plate (2), a plurality of mounting columns (3) arranged on the lower surface of the base plate (2), a support column (4) arranged vertically on the upper surface of the base plate (2), and two groups of support rings (1) arranged horizontally on the support column (4) from top to bottom through a fixing rod (5); the distance between two adjacent support rings (1) in each group is greater than the maximum thickness of the segment gear to be processed. Characterized in that: Each of the support rings (1) comprises a coaxially arranged support ring outer ring (11), a support ring inner ring (12), and a plurality of support ring connecting rods (13) evenly distributed in the circumferential direction connecting the support ring outer ring (11) and the support ring inner ring (12); the outer diameter of each support ring outer ring (11) is matched with the dedendum circle diameter of the maximum segment gear to be processed; a pluggable positioning mandrel (6) is arranged in the inner hole of each support ring inner ring (12), and the diameter of the positioning mandrel (6) is smaller than the inner hole diameter of the segment gear to be processed, which is used for positioning the segment gear to be processed; there are a plurality of positioning mandrels (6), and the diameters of the plurality of positioning mandrels (6) are matched with the inner hole diameters of the segment gears to be processed, which are used for replacement when the inner hole diameters of the segment gears to be processed are different; The upper side of each support ring connecting rod (13) is provided with a plurality of support balls (15) of the same size from inside to outside, which are used to support the segment gear to be processed in the form of point contact; the distance between the support ball (15) closest to the support ring inner ring (12) and the center of the support ring (1) is smaller than the minimum dedendum circle radius of the segment gear to be processed.

2. The segment gear shot peening tooling according to claim 1, characterized in that: The positioning mandrel (6) comprises a cylindrical mandrel body (61) and two cylindrical mandrel mounting columns (62) symmetrically fixed on the lower end surface of the mandrel body (61); the bottom surface diameter of the mandrel body (61) is D1, the bottom surface diameter of the mandrel mounting column (62) is D2, and D1>2D2; Two mandrel fixing rings (14) matched with the bottom surface diameter of the mandrel mounting column (62) are arranged on the support ring inner ring (12); the two mandrel mounting columns (62) pass through the corresponding mandrel fixing rings (14), thereby fixing and mounting the positioning mandrel (6) in the support ring inner ring (12); at this time, the lower surface of the mandrel body (61) is higher than the plane where the apexes of the support balls (15) are located.

3. The segment gear shot peening tooling according to claim 2, characterized in that: There is a single-sided gap of 3-5 mm between the mandrel body (61) and the inner hole of the segment gear to be processed, which is used to ensure that the inner hole wall of the segment gear to be processed can be in contact with the steel shots while the segment gear to be processed is positioned.

4. The segment gear shot peening tooling according to any one of claims 1-3, characterized in that: The two groups of support rings (1) are distributed in a staggered manner, and the height difference L between one support ring (1) in each group and two adjacent support rings (1) in the other group is equal; the thickness of the maximum segment gear to be processed is H, and L-H≥5 mm.

5. The gear wheel shot blasting device of claim 4, wherein each support ring (1) is horizontally arranged on the support column (4) by two fixing rods (5) which are tangentially connected to the support ring (1).

6. The gear wheel shot blasting device of claim 5, wherein the bottom plate (2) comprises an integral mounting disc and a support lug plate, a plurality of mounting columns (3) are fixedly mounted on the lower surface of the mounting disc, and the minimum distance between each mounting column (3) and the edge of the mounting disc is 10-15 mm; the support column (4) is welded on the support lug plate, and the minimum distance between the support column (4) and the edge of the support lug plate is 5 mm.

7. The gear wheel shot blasting device of claim 6, wherein the angle θ between the horizontal line connecting the center of each support ring (1) and the support column (4) and the vertical median plane of the bottom plate (2) is equal, and 23°≤θ≤40°.

8. The gear wheel shot blasting device of claim 1, wherein the distance between two adjacent support balls (15) is equal.

9. The gear wheel shot blasting device of claim 7, wherein the angle θ between the horizontal line connecting the center of each support ring (1) and the support column (4) and the vertical median plane of the bottom plate (2) is 35°. ​ ​ ​ ​ ​

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