A planetary wheel thread rolling plate and thread rolling process thereof

Abstract

The present invention provides a planetary gear thread rolling plate and a thread rolling process thereof, belonging to the field of cold stamping processing technology. It solves the problem that it is very difficult to chamfer the rack on the existing planetary gear. The thread rolling plate includes a main body, on which are provided a plurality of inclined and evenly spaced thread rolling racks, the thread rolling racks having a top surface, a forward tooth surface and a reverse tooth surface, and the thread rolling racks are provided with an inclined surface intersecting with the reverse tooth surface on one side of the reverse tooth surface, the inclined surface and the reverse tooth surface have the same inclination direction, and the angle α between the inclined surface and the side surface where the long side of the main body is located is smaller than the angle β between the reverse tooth surface and the side surface where the long side of the main body is located, after thread rolling, the thread rolling racks form uniform tooth grooves on the outer peripheral surface of the rough planetary gear, and the inclined surface forms an arc-shaped chamfered surface on one side of the groove wall of each tooth groove. Such a design is very convenient for chamfering processing on the planetary gear rack.

Description

Technical Field

[0001] The invention belongs to the technical field of cold stamping processing, and relates to a thread rolling plate, in particular to a thread rolling process of a planetary wheel thread rolling plate. Background Art

[0002] Thread rolling plates are widely used in our daily life. Generally, thread rolling plates appear in pairs. Two thread rolling plates clamp the workpiece to be processed, and then move the workpiece to roll along the thread rolling plates so that the teeth on the thread rolling plates can form a rack on the outer peripheral surface of the workpiece. The thread rolling plates can be used to process the external thread or tap of the workpiece.

[0003] Of course, the teeth on some gears can also be formed by thread rolling and extrusion through a thread rolling plate. For example, the planetary gear on the car starter is formed by thread rolling with a thread rolling plate. In order to facilitate the meshing of the planetary gear with the engine's star wheel, it is generally necessary to machine a chamfer at the end of the rack of the planetary gear. In our domestic existing technology, the rack is threaded and then transferred to the lathe for turning. Since there are many racks, each rack needs to be chamfered. Each rack requires a turning tool to carry out the turning process, which needs to be repeated several times, which is very troublesome. In addition, since the chamfer is an inclined surface, it is extremely difficult to turn it. Multiple turnings will result in the processed chamfered surfaces not being very neat. If the position of the lathe fixture fixing the planetary gear is not correct, the chamfered surfaces will be uneven, which will not only be unsightly, but also inconsistent in use, which seriously affects the use of the planetary gear. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems in the prior art and propose a planetary wheel thread rolling plate and thread rolling process thereof, which solves the technical problem that it is very difficult to chamfer the rack on the existing planetary wheel.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A planetary gear thread rolling plate comprises a main body, on which a plurality of inclined and evenly spaced thread rolling racks are provided, the thread rolling racks having a top surface, a forward tooth surface and a reverse tooth surface, and characterized in that an inclined surface intersecting the reverse tooth surface is provided on one side of the reverse tooth surface on the thread rolling rack, the inclined surface and the reverse tooth surface have the same inclination direction, and the angle α between the inclined surface and the side surface where the long side of the main body is located is smaller than the angle β between the reverse tooth surface and the side surface where the long side of the main body is located.

[0007] When the planetary gear rolls over the thread rolling plate, the raised thread rolling rack on the thread rolling plate will leave evenly spaced tooth grooves on the planetary gear. The thread rolling rack includes a top surface at the top and an inverse tooth surface and a forward tooth surface on both sides of the thread rolling rack. These three surfaces correspond to the groove bottom and the groove walls on both sides of the tooth groove. The thread rolling rack has a protruding portion on the same side as the inverse tooth surface. The side surface of this portion intersects with the inverse tooth surface to form an inclined surface. Since the thread rolling rack is inclined, the inverse tooth surface on its side is also inclined. The inclination angle α of the inclined surface is smaller than the inclination angle β of the inverse tooth surface. In this way, during the rolling process of the planetary gear, the inclined surface will be eccentric due to the angle deviation between α and β, and a curved surface structure similar to a chamfer will be pressed out of the groove wall on one side of the original tooth groove on the planetary gear, thereby realizing the chamfering on the planetary gear rack directly through cold pressing without turning. This design is very convenient for chamfering on the planetary gear rack. Moreover, the present design completes the processing of the rack on the planetary gear and the chamfering on the rack through one thread rolling, which greatly reduces the processing steps and is very convenient for the processing of the chamfer on the rack.

[0008] In the above-mentioned planetary gear thread rolling plate, the main body includes a detachable main plate and a sub-plate, each thread rolling rack includes a half rack one and a half rack two, the half rack one is located on the main plate, the half rack two is located on the sub-plate, and the inclined surface is located on the half rack two.

[0009] The thread rolling plate is composed of a main plate and a sub-plate, and the top surfaces of the main plate and the sub-plate are flush. The top surface of the thread rolling plate is generally processed into a thread rolling strip by turning. Since the reverse tooth surface of the thread rolling plate has an inclined surface, turning is not easy to operate. Therefore, the main plate and the sub-plate are separated to directly separate the part where the inclined surface of the thread rolling strip is located, and the sub-plate is processed separately, and the inclined surface is formed by turning on the sub-plate. After the processing is completed, the sub-plate is reassembled with the main plate so that the toothed half rack one and half rack two on the two are combined into one to re-form a complete toothed rack with a convex portion. This makes it convenient to process the thread rolling plate, and it is also convenient to use the thread rolling plate to rub the rack on the planetary gear and the chamfer on the rack.

[0010] In the above-mentioned planetary gear thread rolling plate, the inclined surface is the reverse tooth surface on the half rack two, and the angle α between the inclined surface and the side surface where the long side of the main body is located is smaller than the angle β between the reverse tooth surface of the half rack one and the side surface where the long side of the main body is located, and when the main plate and the sub-plate abut against each other, the inclined surface intersects with the reverse tooth surface on the half rack two.

[0011] The inclined surface is the reverse tooth surface on the half rack two. In fact, the width of the half rack two gradually increases from the side close to the half rack one to the other side. Since the inclination angle of the forward tooth surface on the half rack two remains unchanged and is the same as the inclination angle on the half rack one, one side of the reverse tooth surface on the half rack two will gradually bulge to form a convex portion, and the inclination angle α of the side surface, that is, the inclined surface, is smaller than the inclination angle β of the reverse tooth surface on the half rack one. This design makes it very convenient to process the thread rolling plate by the separate processing method of the main plate and the sub-plate.

[0012] In the above-mentioned planetary gear thread rolling plate, a pre-tapping portion is provided at one end of the main body, and a plurality of pre-tapping racks are provided on the pre-tapping portion, the closer the distance to the thread rolling racks is, the denser the pre-tapping racks are.

[0013] Since the material of the planetary gear is relatively rigid, it is difficult to directly roll out evenly spaced racks. Therefore, this design uses the pre-tapped part to provide gradually dense pre-tapped racks, which can make the tooth width of the planetary gear gradually widen during the rolling process, making it very convenient to process the racks. Moreover, the pre-tapped part can process the racks into a prototype first, and then the racks can be more easily extruded when they come into contact with the inclined surface.

[0014] In the above-mentioned planetary gear thread rolling plate, an extension portion is provided at the other end of the main body, and a plurality of inter-tooth bars having the same interval as the thread rolling racks are provided on the extension portion.

[0015] The design of the inter-tooth strip can test the rack on the processed planetary gear, and extrude and trim the burrs and flash on the rack to make the processed rack more accurate and more beautiful in appearance.

[0016] In the above-mentioned planetary gear thread rolling plate, the side portions of the pre-tapping portion and the extension portion both protrude from the side of the main plate and surround to form a positioning groove, and the sub-plate is located in the positioning groove and fixed to the main plate by bolts.

[0017] During the thread rolling process, the reaction of the thread rolling plate is very large. If the sub-plate is directly fixed to the main plate by bolts, it is easy to shift under the action of the reaction force or after long-term use, causing the docking position between the main body of the thread rolling strip on the main board and the extended section on the sub-plate to be skewed, resulting in the machined rack breakage or dislocation. Therefore, this design uses a pre-tapped part and an extended part to surround the sub-plate, so that the side of the sub-plate where the force is located is resisted by the pre-tapped part and the extended part, which effectively improves the connection strength of the sub-plate. In this way, the installation position of the sub-plate is positioned, which is very convenient for the installation of the sub-plate.

[0018] In the above-mentioned planetary gear thread rolling plate, the groove wall of the positioning groove located on the side of the extension part is perpendicular to the side of the main plate and one side of the sub-plate rests on the groove wall there, and the groove wall of the positioning groove located on the side of the pre-tapped part is an inclined guide surface and the other side of the sub-plate rests on the groove wall there.

[0019] The groove wall of the positioning groove on one side of the pre-tapped part is not affected by the reaction force, and the side surface there is an inclined guide surface to facilitate the installation and disassembly of the sub-plate. The groove wall of the positioning groove at the extended part is perpendicular to the main plate, and the groove wall there will be pressed by the sub-plate during the thread rolling process, so the vertical design can effectively contact with the sub-plate to provide support to the sub-plate, prevent the sub-plate from shifting, and further facilitate the chamfering process.

[0020] A thread rolling process using the planetary wheel thread rolling plate is characterized by comprising the following steps:

[0021] The first step is positioning and clamping: use a fixture to clamp the blank planetary gear;

[0022] The second step is to adjust the position: move the fixture to arrange the rough planetary wheel along the width direction of the thread rolling plate, and form a chamfering working belt at the inclined surface of all the thread rolling racks on the thread rolling plate. Move the fixture to align the pre-chamfering position on the rough planetary wheel with the chamfering working belt, and the pre-chamfering position on the rough planetary wheel can roll along the chamfering working belt.

[0023] The third step is pre-tapping: move the thread rolling plate close to and squeeze the rough planetary wheel to form rough teeth, and check the tooth bud height of the rough teeth.

[0024] The fourth step is tapping: the thread rolling plate is translated to make the rough planetary wheel roll along the length direction of the thread rolling plate until it is completely separated from the rough planetary wheel. The thread rolling rack forms uniform tooth grooves on the outer peripheral surface of the rough planetary wheel, and the inclined surface on the chamfering working belt forms an arc-shaped chamfered surface on one side of the groove wall of each tooth groove.

[0025] In this thread rolling process, the main thing is to align the position to be chamfered on the blank planetary wheel with the position of the chamfering working belt, so that the blank planetary wheel can roll over the chamfering working belt during rotation, so that the inclined surface on the chamfering working belt can roll out the chamfer on the position to be chamfered. This design is very convenient for us to perform chamfering processing on the planetary gear teeth.

[0026] In the above-mentioned thread rolling process of a planetary wheel thread rolling plate, the fixture in the first step includes two coaxially arranged ejector seats, and the ejector seats can be pressed against the two ends of the planetary wheel by approaching each other.

[0027] In the above-mentioned thread rolling process of a planetary wheel thread rolling plate, the thread rolling plates in the second step have two and are staggered, the chamfering working bands on the two thread rolling plates are located on the same side and aligned with each other, the rough planetary wheel is located between the two thread rolling plates, and the pre-chamfering position on the rough planetary wheel is located between the two chamfering working bands.

[0028] Compared with the existing technology, the advantages of this product are:

[0029] 1. A protruding part on the reverse tooth surface of the rubbing rack is called a convex part, and the side of the convex part is an inclined surface. The inclination angle α of the inclined surface is smaller than the inclination angle β of the reverse tooth surface. In this way, the inclined surface will roll on the teeth of the planetary wheel during the rolling process, and a structure similar to a chamfer will be pressed out. This design is very convenient for chamfering processing on the planetary gear rack.

[0030] 2. This design completes the processing of the rack on the planetary gear and the chamfering on the rack through one thread rolling, which greatly reduces the processing steps and does not require the replacement of machine tools. It is very convenient to process the chamfer on the rack while ensuring the processing accuracy.

[0031] 3. The thread rolling plate is composed of a main plate and a sub-plate. The main reason is that the reverse tooth surface has an inclined surface, which makes it difficult to process the thread rolling rack. By separating the main plate and the sub-plate, the sub-plate where the end of the thread rolling strip is located is separated and turned separately. After the processing is completed, the thread rolling strip is reassembled with the thread rolling plate on the main plate. This design can easily use the thread rolling plate to roll out the rack and the chamfer on the rack on the planetary gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the present invention;

[0033] Figure 2 The present invention Figure 1 A local enlarged view of point A;

[0034] Figure 3 is a partial cross-sectional view of the present invention;

[0035] Figure 4 It is a partial structural schematic diagram of the present invention;

[0036] Figure 5 It is a schematic diagram of the structure of the auxiliary plate of the present invention;

[0037] Figure 6 It is a schematic diagram of the ejector seat clamping the planetary gear of the present invention;

[0038] Figure 7 It is a schematic diagram of the planetary gear structure of the present invention;

[0039] Figure 8 The present invention Figure 7 A local enlarged view of point B.

[0040] In the figure, 1, main body; 11, main board; 12, sub-board; 13, pre-tapped part; 14, extended part; 15, positioning groove; 151, guide surface; 2, rubbing rack; 20, top surface; 21, forward tooth surface; 22, reverse tooth surface; 23, half rack one; 24, half rack two; 25, inclined surface; 26, chamfered working belt; 3, pre-rubbing rack; 4, inter-tooth strip; 5, fixture; 51, ejector seat; 6, planetary gear; 61, tooth bud; 62, chamfered surface. DETAILED DESCRIPTION

[0041] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0042] like Figure 1-Figure 8 A planetary gear thread rolling plate shown includes a main body 1 with a feed end and a discharge end. The main body 1 is provided with a plurality of thread rolling racks 2 inclined toward the feed end and evenly spaced. The thread rolling racks 2 include a forward tooth surface 21, a reverse tooth surface 22 and a top surface 20. The forward tooth surface 21 is located on the side of the thread rolling rack 2 facing the feed end, and the reverse tooth surface 22 is located on the side of the thread rolling rack 2 facing the discharge end.

[0043] The present threading rack 2 is provided with a raised convex portion on the side located at the reverse tooth surface 22, and the convex portion has an inclined side surface called an inclined surface 25, and an angle α is formed between the inclined surface 25 and the side surface of the long side of the body 1, and an angle β is also formed between the reverse tooth surface 22 and the side surface of the long side of the body 1, and both α and β are greater than 90 degrees and the angle α is less than the angle β. With such a design, when the planetary gear 6 rolls over the thread rolling plate, the raised thread rolling rack 2 on the thread rolling plate will leave evenly spaced tooth grooves on the planetary gear 6, and the reverse tooth surface 22 and the forward tooth surface 21 are extruded and formed on the groove walls on both sides of the tooth groove, and the inclined surface 25 will press out an arc surface similar to a chamfered structure on the groove wall formed on the reverse tooth surface 22, so as to realize the processing of chamfers on the rack of the planetary gear 6 directly by cold pressing without turning, and such a design is very convenient for the chamfering processing on the rack of the planetary gear 6. Moreover, the present design completes the processing of the rack on the planetary gear 6 and the chamfering of the rack through one thread rolling, which greatly reduces the processing steps and is very convenient for the processing of the chamfering on the rack.

[0044] The body 1 includes a detachable main plate 11 and a sub-plate 12, the top surface 20 of the main plate 11 is flush with the top surface 20 of the sub-plate 12, and the inclined surface 25 is located on the reverse tooth surface 22 of the rolling rack 2 at the sub-plate 12. The rolling rack 2 includes a split half rack 1 23 and a half rack 2 24, the half rack 1 23 is located on the top surface 20 of the main plate 11, the half rack 24 is located on the top surface 20 of the sub-plate 12, and the inclined surface 25 is the reverse tooth surface 22 of the half rack 2 24. The top surfaces 20 of the main plate 11 and the sub-plate 12 are flush. The top surface 20 of the thread rolling plate is generally processed into a thread rolling strip by turning. Since the reverse tooth surface 22 of the thread rolling plate has an inclined surface 25, turning is difficult to operate. Therefore, the sub-plate 12 where the end of the thread rolling strip is located is separated from the main plate 11 and the sub-plate 12 and turned separately. After the processing is completed, the thread rolling strip is reassembled with the thread rolling plate on the main plate 11. This design can conveniently use the thread rolling plate to roll out the rack and the chamfer on the rack on the planetary gear 6. The inclined surface 25 is located at the end of the thread rolling rack 2, so the thread rolling rack 2 where the inclined surface 25 is located is directly separated from the thread rolling rack 2 without the inclined surface 25. The separated two parts can be turned separately, and then assembled and fixed after the processing is completed to form a complete thread rolling strip with an inclined surface 25 for thread rolling. The thread rolling plate can be used to roll out a rack with a chamfer on the planetary gear 6. This design is very convenient for the processing of the thread rolling plate on the basis of facilitating the processing of the chamfer.

[0045] A pre-tapped portion 13 is provided at one end of the body 1, and a plurality of pre-tapped racks 3 are provided on the pre-tapped portion 13, which are denser the closer to the rolling rack 2. An extension portion 14 is provided at the other end of the body 1, and a plurality of inter-tooth bars 4 are provided on the extension portion 14, which are the same as the spacing of the rolling rack 2. Since the material rigidity of the planetary gear 6 is relatively large, it is difficult to directly roll out a rack with uniform spacing. Therefore, the present design provides a gradually dense pre-tapped rack 3 on the pre-tapped portion 13 through the design of the pre-tapped portion 13, so that the tooth groove width on the planetary gear 6 can gradually widen during the rolling process, which is very convenient for the processing of the rack. Moreover, the pre-tapped portion 13 can first process the rack into a prototype, and then the rack is easier to be extruded when it contacts the inclined surface 25. The design of the inter-tooth bars 4 can verify the rack on the processed planetary gear 6, and extrude and trim the burrs and flash on the rack, so that the processed rack has higher precision and more beautiful appearance.

[0046] The side portions of the pre-tapped portion 13 and the extended portion 14 are both protruding from the side of the main board 11 and surround to form a positioning groove 15, and the sub-board 12 is located in the positioning groove 15 and fixed to the main board 11 by bolts. The groove wall of the positioning groove 15 located on one side of the extended portion 14 is perpendicular to the side of the main board 11, and one side of the sub-board 12 abuts against the groove wall at that location, and the groove wall of the positioning groove 15 located on one side of the pre-tapped portion 13 is an inclined guide surface 151, and the other side of the sub-board 12 abuts against the groove wall at that location. During the thread rolling process, the reaction of the thread rolling plate is very large. If the sub-plate 12 is directly fixed to the main plate 11 by bolts, it is easy to shift under the action of the reaction force or after long-term use, causing the docking position of the half-rack 1 23 of the thread rolling strip on the main plate 11 and the half-rack 2 24 on the sub-plate 12 to be skewed, resulting in the processed rack breakage or dislocation. Therefore, the design adopts the pre-tapped part 13 and the extension part 14 to surround the sub-plate 12, so that the side of the sub-plate 12 where the force is applied is resisted by the pre-tapped part 13 and the extension part 14, which effectively improves the connection strength of the sub-plate 12. In this way, the installation position of the sub-plate 12 is positioned, which is very convenient for the installation of the sub-plate 12. The groove wall of the positioning groove 15 on one side of the pre-tapped portion 13 is not affected by the reaction force, and the side surface there is an inclined guide surface 151, which can facilitate the installation and disassembly of the sub-plate 12. The groove wall of the positioning groove 15 at the extension portion 14 is perpendicular to the main plate 11. The groove wall there will be pressed by the sub-plate 12 during the thread rolling process, so the vertical design can effectively contact with the sub-plate 12 to provide support to the sub-plate 12, prevent the sub-plate 12 from shifting, and further facilitate the chamfering process.

[0047] The specific process of using the above-mentioned thread rolling plate to roll and extrude the planetary gear 6 includes the following steps: the first step is to clamp the rough planetary gear 6 with a fixture 5, and the fixture 5 includes two coaxially arranged ejector seats 51, and the ejector seats 51 can be pressed against the two ends of the planetary gear 6 by approaching each other. The second step is to use two staggered and parallel thread rolling plates to roll the planetary gear 6, and the thread rolling plates are fixed with a support plate that can move in four directions. The thread rolling plates are driven by the support plate to move and adjust the position between them and the planetary gear 6, and the ejector seat 51 support plate can drive the two thread rolling plates to adjust the position. Move the two thread rolling plates so that the feed ends on them are against the two sides of the planetary gear 6 respectively. The third step is to check the position of the planetary gear 6 so that the position on it that needs to be chamfered corresponds to the chamfering work belt 28 on the thread rolling plate, and the chamfering work belt 28 is the chamfering area composed of all the half racks 24 on the auxiliary plate 12. The fourth step is to approach each other and press out the tooth buds on the planetary gear 6 synchronously, and check the position and height of the tooth buds. In the fifth step, the two thread rolling plates move toward each other until they are separated from the planetary gear 6, that is, the processing of the planetary gear 6 is completed, and the rolling rack 2 forms uniform tooth grooves 61 on the outer peripheral surface of the rough planetary gear 6, and the inclined surface 25 on the chamfering working belt 28 forms an arc-shaped chamfered surface 62 on one side of the groove wall of each tooth groove 62. This thread rolling process is completed by two staggered thread rolling plates, and the rolling racks 2 on the two thread rolling plates are facing each other. The two thread rolling plates are respectively located on both sides of the planetary gear 6 and clamp the planetary gear 6 by approaching each other. Then, the position on the planetary gear 6 that needs to be chamfered needs to be aligned with the end of the inclined surface 25 on the rolling rack 2. The two thread rolling plates move toward each other to complete the processing of the rack with chamfers. This processing method only needs to use two thread rolling plates to complete, and the operation is simple, and it is very convenient to process chamfers on the rack.

[0048] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A planetary thread rolling plate, comprising a main body (1), the main body (1) being provided with a plurality of inclined and evenly spaced thread rolling racks (2), the thread rolling racks (2) having a top surface (20), a forward tooth surface (21) and a reverse tooth surface (22), characterized in that: The rolling rack (2) is provided with an inclined surface (25) intersecting the inverse tooth surface (22) on one side of the inverse tooth surface (22); the inclined surface (25) and the inverse tooth surface (22) have the same inclination direction, and the angle α between the inclined surface (25) and the side surface where the long side of the body (1) is located is smaller than the angle β between the inverse tooth surface (22) and the side surface where the long side of the body (1) is located; the angle α and the angle β are both greater than 90 degrees; the body (1) comprises a detachable main plate (11) and a sub-plate (12); each rolling rack (2) comprises a half rack 1 (23) and a half rack 2 (24); the half rack 1 (23) is located on the main plate (11), the half rack 2 (24) is located on the sub-plate (12), the inclined surface (25) is located on the half rack 2 (24), one end of the main plate (11) is provided with a pre-tapped portion (13), and the pre-tapped portion (13) is provided with a plurality of distance The pre-twisting rack (3) has a denser arrangement as the twisting racks (2) are closer together. The other end of the main board (11) is provided with an extension portion (14). The extension portion (14) is provided with a plurality of inter-tooth bars (4) with the same spacing as the twisting racks (2). The side portions of the pre-tapping portion (13) and the extension portion (14) both protrude from the side surface where the long side of the main board (11) is located and surround the side surface of the main board (11) to form a positioning groove (15). The auxiliary plate (12) is clamped in the positioning groove (15). During the pre-tapping and tapping process, the pre-tapping portion (13) first processes the rack of the rough planetary gear (6) into a prototype. Then, the rack of the rough planetary gear (6) contacts the chamfered surface (62) processed by the inclined surface (25). Thereafter, the inter-tooth bars (4) test the rack on the rough planetary gear (6) processed, and extrude and trim the burrs and flash on the rack of the rough planetary gear (6).

2. A planetary gear thread rolling plate according to claim 1, characterized in that: The inclined surface (25) is the reverse tooth surface (22) on the second half rack (24), and the included angle α between the inclined surface (25) and the side surface where the long side of the body (1) is located is smaller than the included angle β between the reverse tooth surface (22) of the first half rack (23) and the side surface where the long side of the body (1) is located.

3. A planetary wheel thread rolling plate according to claim 1 or 2, characterized in that: The groove wall of the positioning groove (15) located on the side of the extension part (14) is perpendicular to the side of the main plate (11), and one side of the auxiliary plate (12) abuts against the groove wall of the positioning groove (15) located on the side of the extension part (14); the groove wall of the positioning groove (15) located on the side of the pre-tapped part (13) is an inclined guide surface (151), and the other side of the auxiliary plate (12) abuts against the groove wall of the positioning groove (15) located on the side of the pre-tapped part (13); the auxiliary plate (12) is fixed to the main plate (11) by bolts.

4. A thread rolling process using a planetary wheel thread rolling plate according to any one of claims 1 to 3, characterized in that: The following steps are involved: The first step is positioning and clamping: using a clamp (5) to clamp the blank planetary gear (6); The second step is to adjust the position: the fixture (5) is moved so that the blank planetary wheel (6) is arranged along the width direction of the thread rolling plate, and the inclined surfaces (25) of all the thread rolling racks (2) on the thread rolling plate form a chamfering working belt (26). The fixture (5) is moved so that the pre-chamfering position on the blank planetary wheel (6) is aligned with the chamfering working belt (26), and the pre-chamfering position on the blank planetary wheel (6) can roll along the chamfering working belt (26); The third step is pre-tapping: move the thread rolling plate close to and squeeze the blank planetary wheel (6) to form blank teeth, and check the tooth bud height of the blank teeth; Step 4: tapping: the thread rolling plate is translated to make the rough planetary wheel (6) roll along the length direction of the thread rolling plate until it is completely separated from the rough planetary wheel (6), the thread rolling rack (2) forms uniform tooth grooves (61) on the outer peripheral surface of the rough planetary wheel (6), and the inclined surface (25) on the chamfering working belt (28) forms an arc-shaped chamfered surface (62) on one side of the groove wall of each tooth groove (62); During the pre-tapping and tapping process, the pre-tapping part (13) first processes the rack of the rough planetary wheel (6) into a prototype, and then the rack of the rough planetary wheel (6) contacts the chamfered surface (62) processed by the inclined surface (25), and then the inter-tooth bar (4) verifies the rack on the processed rough planetary wheel (6), and squeezes and trims the burrs and flash on the rack of the rough planetary wheel (6).

5. The thread rolling process according to claim 4, characterized in that: The fixture (5) in the first step comprises two coaxially arranged ejector seats (51), and the ejector seats (51) can be pressed against the two ends of the blank planetary gear (6) by approaching each other.

6. The thread rolling process according to claim 4 or 5, characterized in that: The thread rolling plates in the second step are provided with two pieces and are arranged in a staggered manner. The chamfering working bands (26) on the two thread rolling plates are located on the same side and are aligned with each other. The blank planetary wheel (6) is located between the two thread rolling plates. The pre-chamfering position on the blank planetary wheel (6) is located between the two chamfering working bands (26).

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