Process for machining large carburized and quenched inner ring gear

Abstract

The application discloses a machining process for a large carburizing and quenching inner gear ring, which comprises the following steps: placing a quenched and tempered product inner gear ring blank on a platform of a machining device; performing semi-finishing machining on the product inner gear ring blank by the machining device, and then performing gear milling; processing a second arc with a radius of R2 on the inner gear ring during the gear milling; performing chamfering and beveling on the product inner gear ring after the gear milling; performing carburizing and quenching machining at a machining temperature of a first temperature and a machining time of a first time; placing the product inner gear ring on the machining device to perform finishing machining; then performing gear grinding; finally, detecting the machined product inner gear ring and storing the product inner gear ring; and the second arc is processed on the product inner gear ring by using the reverse deformation principle during the gear milling, so that the addendum circle of the inner gear ring after carburizing and quenching deformation basically meets the drawing requirements, the tooth part allowance is uniform, the grinding allowance is reduced, the dedendum can meet the requirements, and the production efficiency of the inner gear ring is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of internal gear ring machining technology, and particularly relates to a machining process for large carburized and quenched internal gear rings. Background Technology

[0002] Internal gear rings refer to the internal gears on the same axis as the planetary carrier in planetary gear transmissions. Carburizing and quenching is a common heat treatment process for metallic materials. It can give the surface of carburized workpieces high hardness and improve their wear resistance. Traditional processes mainly include: low-temperature tempering, pre-cooling direct quenching, single-heat quenching, high-temperature tempering after carburizing, secondary quenching and cold treatment, and induction heating after carburizing. Quenching technology is widely used in modern mechanical manufacturing industry. Important parts in machinery, especially steel parts used in automobiles, airplanes and rockets, almost all undergo quenching treatment. In order to meet the diverse technical requirements of various parts, various quenching processes have been developed.

[0003] Large carburized and quenched internal gear rings exhibit a waist-shaped bulge after the carburizing and quenching process. This results in a large allowance at both ends of the tooth width during finish turning, leading to chip breaking and potentially no machining allowance in the middle of the tooth width. During grinding, the large grinding allowance at both ends and the small or nonexistent allowance in the middle results in uneven grinding allowance. Consequently, the carburized layer depth and hardness are uneven along the tooth width after grinding, the usable root circle diameter in the middle does not meet the design requirements, and the teeth exhibit black skin, out-of-tolerance common normals, and may even lead to part scrap. Therefore, a machining process for large carburized and quenched internal gear rings is urgently needed. Summary of the Invention

[0004] To address some or all of the technical problems existing in the prior art, the present invention provides a machining process for large carburized and quenched internal gear rings.

[0005] The machining process for large carburized and quenched internal gear rings provided by this invention includes:

[0006] The heat-treated test internal gear ring blank is placed on the platform of the processing equipment;

[0007] The test internal gear ring blank is semi-finished and then milled using the aforementioned processing equipment.

[0008] After milling, the test internal gear ring is chamfered and then subjected to carburizing and quenching at a first temperature and a first time. The arc detection shows that the test internal gear ring after carburizing and quenching has a first arc deformation of R1 due to the high temperature. The bulge of the first arc deformation is S. The value of the arc R1 is recorded, and the arc R2 matching the arc R1 is calculated.

[0009] The heat-treated internal gear ring blank is placed on the platform of the processing equipment;

[0010] After semi-finish turning of the product's internal gear ring blank using the processing equipment, the gears are milled. During the milling process, a second arc with an arc of R2 is machined into the internal gear ring.

[0011] After milling, the internal gear ring of the product is chamfered and then carburized and quenched at the first temperature and for the first time.

[0012] The internal gear ring of the product is placed in the processing equipment for precision turning, and then the gears are ground.

[0013] Finally, the finished internal gear ring is inspected and put into storage.

[0014] As a specific implementation, in the above-mentioned processing technology for large carburized and quenched internal gear rings, the arc detection step includes tooth tip circle detection, outer circle detection, and tooth section detection.

[0015] As a specific implementation, in the above-mentioned processing technology for large carburized and quenched internal gear rings, the tooth tip circle detection process is as follows: along the tooth width direction, the arc d1 is measured with calipers at a distance of 8-12mm from the top end face, the arc d2 is measured at the center position in the width direction, and the arc d3 is measured at a distance of 8-12mm from the bottom end face.

[0016] As a specific implementation, in the above-mentioned processing technology for large carburized and quenched internal gear rings, the formula for the tooth tip radius R is S=(d1+d3) / 2-d2, R*R=(RS)*(RS)+b*b / 4, where b is the tooth width.

[0017] As a specific implementation, in the above-mentioned processing technology for large carburized and quenched internal gear rings, the outer circle inspection process is as follows: using calipers to measure the arc of the outer circle along the tooth width direction at a distance of 8-12mm from the top end face as D1, the arc at the center position in the width direction as D2, and the arc at a distance of 8-12mm from the bottom end face as D3.

[0018] As a specific implementation, in the above-mentioned processing technology for large carburized and quenched internal gear rings, the tooth inspection process is as follows: the arc of the tooth 8-12mm from the top end face is measured by the bar spacing as d'1, the arc at the center position in the width direction is d'2, and the arc of the tooth 8-12mm from the bottom end face is d'3.

[0019] As a specific implementation, in the above-mentioned processing technology for large carburized and quenched internal gear rings, the relationship of the tooth curvature R' is S'=(d'1+d'3) / 2-d'2, R'*R'=(R'-S')*(R'-S')+b*b / 4, where S' is the curvature of the tooth during the deformation process, and b is the tooth width.

[0020] As a specific implementation, in the above-mentioned processing technology for large carburized and quenched internal gear rings, during the arc detection process, 3 to 6 detection positions need to be uniformly selected along the circumference of the internal gear ring for arc detection.

[0021] The machining process for large carburized and quenched internal gear rings of the present invention has the following advantages and positive effects:

[0022] Before machining the internal gear ring of the product, this invention performs carburizing and quenching treatment on a test internal gear ring that is equivalent to the product's internal gear ring. The first arc shape caused by high-temperature deformation of the internal gear ring is detected. Utilizing the principle of reverse deformation, a second arc shape matching the first arc shape is machined on the internal gear ring during the milling process. This fully ensures that the tooth tip circle of the internal gear ring after carburizing and quenching deformation basically meets the drawing requirements, the tooth allowance is uniform, the grinding allowance is reduced, and the tooth root circle can meet the requirements, greatly improving the production efficiency of the internal gear ring. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for further understanding of the embodiments of the present invention and constitute a part of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0024] Figure 1 This is a diagram showing the state of the test internal gear ring after semi-finish turning in the machining process of the large carburized and quenched internal gear ring of the present invention.

[0025] Figure 2 This is a diagram showing the state of the test internal gear ring after milling in the machining process of the large carburized and quenched internal gear ring of the present invention.

[0026] Figure 3 This is a diagram showing the state of the test internal gear ring after carburizing and quenching in the processing technology of the present invention for a large carburized and quenched internal gear ring.

[0027] Figure 4 This is a diagram of the internal gear ring after semi-finish turning in the machining process of the large carburized and quenched internal gear ring of the present invention.

[0028] Figure 5This is a diagram showing the state of the internal gear ring after milling in the machining process of a large carburized and quenched internal gear ring according to the present invention.

[0029] Figure 6 This is a diagram showing the state of the internal gear ring after carburizing and quenching in the processing technology of the large carburized and quenched internal gear ring of the present invention.

[0030] Figure 7 This is a schematic diagram of the arc detection position in the machining process of a large carburized and quenched internal gear ring according to the present invention.

[0031] Figure 8 This is a schematic diagram of the detection position in the machining process of a large carburized and quenched internal gear ring according to the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1-Test internal gear ring, 11-First arc, 2-Product internal gear ring, 21-Second arc, 3-Detection position. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0035] like Figures 1 to 8As shown, this invention discloses a processing technology for large carburized and quenched internal gear rings, comprising: placing a tempered test internal gear ring 1 blank on the platform of a processing equipment; tempering allows the test internal gear ring 1 blank to achieve a good balance between strength and toughness, and improves its hardness and wear resistance; performing semi-finish turning on the test internal gear ring 1 blank using the processing equipment, followed by gear milling; and performing chamfering and beveling on the milled test internal gear ring 1, followed by carburizing at a first temperature and for a first processing time. After quenching, the arc measurement revealed that the test internal gear ring 1, after carburizing and quenching, underwent a first arc deformation of arc 11 with an arc of arc R1 due to the high temperature. The bulge of the first arc deformation 11 was S. The value of arc R1 was recorded, and the arc R2 matching arc R1 was calculated. Before machining the product internal gear ring 2, the parameters of the deformation of the internal gear ring during carburizing and quenching were determined through the test internal gear ring 1, which facilitates the subsequent reverse deformation treatment of the product internal gear ring 2 during machining. In process 2, the heat-treated internal gear ring 2 blank is placed on the platform of the processing equipment. The internal gear ring 2 blank is semi-finished and then milled. During milling, a second arc 21 with an radius of R2 is machined into the internal gear ring 2. The second arc 21 is the reverse of the first arc 11. After milling, the internal gear ring 2 is chamfered and then carburized and quenched at a first temperature and for a first time. The processing temperature and time are the same as those of the test internal gear ring 1. This setting allows the first arc 11 generated by high-temperature deformation after carburizing and quenching to cancel out the second arc 21 generated during milling, thus meeting the usage standards for internal gear rings. The internal gear ring 2 is then precision-machined and ground. Finally, the machined internal gear ring 2 is inspected and stored. To process internal gear rings of other sizes, the above process can be followed.

[0036] As one specific implementation, in the machining process of the large carburized and quenched internal gear ring of the present invention, the arc detection step includes tooth tip circle detection, outer circle detection, and tooth section detection.

[0037] As a specific implementation, in the machining process of the large carburized and quenched internal gear ring of the present invention, the tooth tip circle detection process is as follows: Measure the arc d1 at a distance of 8-12 mm from the top end face along the tooth width direction using calipers, the arc at the center position in the width direction is d2, and the arc d3 at a distance of 8-12 mm from the bottom end face. More specifically, the d1 measurement position is 10 mm from the top end face of the internal gear ring, and the d3 measurement position is 10 mm from the bottom end face of the internal gear ring.

[0038] As a specific implementation, in the machining process of the large carburized and quenched internal gear ring of the present invention, the formula for the tooth tip radius R is S=(d1+d3) / 2-d2, R*R=(RS)*(RS)+b*b / 4, where b is the tooth width.

[0039] As a specific implementation, in the machining process of the large carburized and quenched internal gear ring of the present invention, the outer circle inspection process is as follows: along the tooth width direction, the arc 8-12mm from the top end face is measured with calipers as D1, the arc at the center position in the width direction is D2, and the arc 8-12mm from the bottom end face is D3. More specifically, the D1 measurement position is 10mm from the top end face of the internal gear ring, and the D3 measurement position is 10mm from the bottom end face of the internal gear ring.

[0040] As a specific implementation, in the machining process of the large carburized and quenched internal gear ring of the present invention, the tooth inspection process is as follows: the arc of the tooth 8-12 mm from the top end face is d'1, the arc at the center position in the width direction is d'2, and the arc of the tooth 8-12 mm from the bottom end face is d'3. More specifically, the measurement position of d'1 is 10 mm from the top end face of the internal gear ring, and the measurement position of d'3 is 10 mm from the bottom end face of the internal gear ring.

[0041] In one specific embodiment, in the machining process of the large carburized and quenched internal gear ring of the present invention, the relationship of the tooth curvature R' is S'=(d'1+d'3) / 2-d'2, R'*R'=(R'-S')*(R'-S')+b*b / 4, where S' is the curvature of the tooth during the deformation process, and b is the tooth width.

[0042] As a specific implementation, in the processing technology of the present invention for large carburized and quenched internal gear rings, during the arc detection process, 3 to 6 detection positions 3 are uniformly selected along the circumference of the internal gear ring for arc detection. More specifically, during the arc detection process, 4 detection positions 3 are uniformly selected along the circumference of the internal gear ring for arc detection. This setting can make the arc detection more accurate, thereby ensuring that the second arc can meet the processing requirements after carburizing and quenching deformation.

[0043] In summary, compared with the prior art, the machining process of the present invention for large carburized and quenched internal gear rings has the following advantages and positive effects:

[0044] Before machining the internal gear ring 2 of the product, the present invention performs carburizing and quenching treatment on a test internal gear ring 1 that is equivalent to the product internal gear ring 2. The first arc 11 caused by high temperature deformation of the test internal gear ring 1 is detected. Using the principle of reverse deformation, during the milling process, a second arc 21 matching the first arc 11 is machined on the product internal gear ring 2. This fully ensures that the tooth tip circle of the product internal gear ring 2 after carburizing and quenching deformation basically meets the drawing requirements, the tooth allowance is uniform, the grinding allowance is reduced, and the tooth root circle can meet the requirements, which greatly improves the production efficiency of the internal gear ring.

[0045] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Meanwhile, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In addition, the terms "front," "rear," "left," "right," "upper," and "lower" in this document refer to the placement states shown in the accompanying drawings.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A machining process for large carburized and quenched internal gear rings, characterized in that, include: The heat-treated test internal gear ring blank is placed on the platform of the processing equipment; The test internal gear ring blank is semi-finished and then milled using the aforementioned processing equipment. After milling, the test internal gear ring is chamfered and then carburized and quenched at a processing temperature of the first temperature and a processing time of the first time. The arc detection shows that the test internal gear ring after carburizing and quenching has a first arc deformation of arc R1 due to high temperature. The bulge of the first arc deformation is S. The value of arc R1 is recorded, and the arc R2 matching arc R1 is calculated. The heat-treated internal gear ring blank is placed on the platform of the processing equipment; After semi-finish turning of the internal gear ring blank by the processing equipment, the gear is milled. During the milling process, a second arc with an arc of R2 is machined on the internal gear ring. After milling, the internal gear ring of the product is chamfered and then carburized and quenched at the first temperature and for the first time. The internal gear ring of the product is placed in the processing equipment for precision turning, and then the gears are ground. Finally, the finished internal gear ring is inspected and put into storage.

2. The machining process for large carburized and quenched internal gear rings according to claim 1, characterized in that, Curvature detection includes tooth tip circle detection, outer circle detection, and tooth section detection.

3. The machining process for large carburized and quenched internal gear rings according to claim 2, characterized in that, The tooth tip circle detection process is as follows: along the tooth width direction, use calipers to measure the arc d1 at a distance of 8~12mm from the top end face, the arc d2 at the center position in the width direction, and the arc d3 at a distance of 8~12mm from the bottom end face.

4. The machining process for large carburized and quenched internal gear rings according to claim 3, characterized in that, The formula for the tooth tip radius R is: , where b is the tooth width.

5. The machining process for large carburized and quenched internal gear rings according to claim 2, characterized in that, The outer circle inspection process is as follows: along the tooth width direction, use calipers to measure the arc at a distance of 8~12mm from the top end face as D1, the arc at the center position in the width direction as D2, and the arc at a distance of 8~12mm from the bottom end face as D3.

6. The machining process for large carburized and quenched internal gear rings according to claim 2, characterized in that, The tooth detection process is as follows: the arc d'1 is measured 8-12 mm from the top end face of the tooth by the bar spacing, the arc d'2 is measured at the center position in the width direction, and the arc d'3 is measured 8-12 mm from the bottom end face.

7. The machining process for large carburized and quenched internal gear rings according to claim 6, characterized in that, The formula for the tooth radius R' is S' = (d'1 + d'3) / 2 - d'2, R' = (R'-S') '-S' Where S' is the bulge of the tooth during the deformation process, and b is the tooth width.

8. The machining process for large carburized and quenched internal gear rings according to claim 1, characterized in that, During the curvature detection process, 3 to 6 detection positions need to be selected evenly along the circumference of the internal gear ring for curvature detection.

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