Machining process for large carburizing and quenching inner gear ring

Abstract

The invention 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 machining equipment, carrying out semi-finish turning on the product inner gear ring blank through the machining equipment, then milling teeth, machining a second arc with the radian of R2 on the inner gear ring in the tooth milling process, the product inner gear ring obtained after gear milling is subjected to chamfering treatment, carburizing and quenching machining with the machining temperature being the first temperature and the machining time being the first time is carried out, the product inner gear ring is placed in machining equipment to be subjected to finish turning machining, then gear grinding is carried out, and finally the machined product inner gear ring is detected and put in storage; the reverse deformation principle is utilized, in the gear milling process, the second arc is machined on the inner gear ring of the product, it is fully guaranteed that the addendum circle of the inner gear ring basically meets the drawing requirement after carburizing and quenching deformation, the tooth allowance is uniform, the grinding allowance is reduced, the usable dedendum circle meets the requirement, and the production efficiency of the inner gear ring is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of internal gear ring processing, and in particular relates to a processing technology for a large carburized and quenched internal gear ring. Background Art

[0002] The inner ring gear refers to the internal gear on the same axis as the planetary carrier in the planetary gear transmission, and the carburizing and quenching process is a common heat treatment process for metal materials. It can make the surface of the carburized workpiece obtain very high hardness and improve its wear resistance. The traditional processes mainly include: low temperature tempering, pre-cooling direct quenching, primary heating quenching, carburizing high temperature tempering, secondary quenching cold treatment, induction heating after carburizing and other processes. The quenching process is widely used in the modern machinery manufacturing industry. Important parts in machinery, especially steel parts used in automobiles, airplanes, and rockets, are almost all quenched. In order to meet the different technical requirements of various parts, various quenching processes have been developed.

[0003] Large carburized and quenched internal gear rings are found to have a waist drum shape after the carburizing and quenching process, resulting in large allowances at both ends of the tooth width during fine turning after carburizing and quenching, and chip breaking cutting occurs. There may be no machining allowance in the middle of the tooth width. During gear grinding, the grinding allowance is uneven due to the large grinding allowances at both ends along the tooth width and the small grinding allowance in the middle, or no grinding allowance. After gear grinding, the depth of the carburized layer along the tooth width is uneven, the hardness is uneven, the available root circle diameter in the middle does not meet the requirements of the design drawings, the tooth is black, the normal line is out of tolerance, and even the parts are scrapped. In summary, there is an urgent need for a processing technology for large carburized and quenched internal gear rings. Summary of the invention

[0004] In order to solve part or all of the technical problems existing in the above-mentioned prior art, the present invention provides a processing technology for a large carburized and quenched internal gear ring.

[0005] The processing technology for large carburized and quenched internal gear ring provided by the present invention comprises:

[0006] Place the quenched and tempered test internal gear blank on the platform of the processing equipment;

[0007] The test inner gear ring blank is semi-finished turned by the processing equipment and then gear milled;

[0008] The test inner gear ring after gear milling is subjected to chamfering and then carburizing and quenching processing at a first temperature and a first time. It can be seen from the arc detection that the test inner gear ring after carburizing and quenching generates a first arc deformation with an arc R1 due to the high temperature, and 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] Place the quenched and tempered inner gear ring blank on the platform of the processing equipment;

[0010] The inner gear ring blank of the product is semi-finished by the processing equipment and then gear milling is performed, and the second arc with an arc of R2 is processed on the inner gear ring during the gear milling process;

[0011] Carburizing and quenching the inner gear ring of the product after gear milling at the first temperature and the first time;

[0012] Placing the inner gear ring of the product on the processing equipment for fine turning, and then grinding the gears;

[0013] Finally, the processed inner 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 top circle detection, outer circle detection, and tooth portion detection.

[0015] As a specific implementation method, in the above-mentioned processing technology for large carburized and quenched internal gear rings, the tooth top circle detection process is: use a caliper to measure the curvature d1 at 8 to 12 mm from the top end face along the tooth width direction, the curvature d2 at the center position in the width direction, and the curvature d3 at 8 to 12 mm 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 relationship between the tooth top 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 method, in the above-mentioned processing technology for large carburized and quenched internal gear rings, the outer circle detection process is: using a caliper to measure the outer circle along the tooth width direction, the arc is D1 at 8 to 12 mm from the top end face, the arc at the center position in the width direction is D2, and the arc at 8 to 12 mm from the bottom end face is D3.

[0018] As a specific implementation, in the above-mentioned processing technology for large carburized and quenched internal gear rings, the tooth detection process is: the arc of the tooth at 8 to 12 mm from the top end face is measured by rod spacing as d'1, the arc at the center position in the width direction is d'2, and the arc at 8 to 12 mm 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 between the tooth curvature R' is S'=(d'1+d'3) / 2-d'2, R'*R'=(R'-S')*(R'-S')+b*b / 4, wherein S' is the bulge 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 curvature detection process, 3 to 6 detection positions need to be evenly selected along the circumference of the internal gear ring to perform the curvature detection.

[0021] The processing technology for large carburized and quenched internal gear ring of the present invention has the following advantages and positive effects:

[0022] Before processing the inner gear ring of the product, the present invention performs carburizing and quenching treatment on a test inner gear ring that is equivalent to the inner gear ring of the product, detects the first arc curvature of the inner gear ring caused by high-temperature deformation, and utilizes the reverse deformation principle to process a second arc matching the first arc on the inner gear ring during the gear milling process, thereby fully ensuring that the top circle of the inner gear ring after carburizing and quenching deformation basically meets the requirements of the drawing, the tooth allowance is uniform, the grinding allowance is reduced, the available root circle can meet the requirements, and the production efficiency of the inner gear ring is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings in the following descriptions are only used to further understand the embodiments of the present invention and constitute a part of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0024] Figure 1 This is a state diagram of a test internal gear ring after semi-finishing turning in the processing technology for a large carburized and quenched internal gear ring of the present invention;

[0025] Figure 2 This is a state diagram of a test internal gear ring after gear milling in the processing technology for large carburized and quenched internal gear ring of the present invention;

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

[0027] Figure 4 This is a state diagram of the inner gear ring of the product after semi-finishing turning in the processing technology for large carburized and quenched inner gear ring of the present invention;

[0028] Figure 5This is a state diagram of the product internal gear ring after gear milling in the processing technology for large carburized and quenched internal gear ring of the present invention;

[0029] Figure 6 This is a state diagram of the product internal gear ring after carburizing and quenching in the processing technology for large carburizing and quenching internal gear ring of the present invention;

[0030] Figure 7 It is a schematic diagram of the arc detection position in the processing technology for large carburized and quenched internal gear ring of the present invention;

[0031] Figure 8 It is a schematic diagram of the detection position in the processing technology for large carburized and quenched internal gear ring of the present invention.

[0032] Description of reference numerals:

[0033] 1-test inner gear ring, 11-first arc, 2-product inner gear ring, 21-second arc, 3-detection position. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] like Figures 1 to 8As shown, the present invention discloses a processing technology for large carburized and quenched internal gear rings, comprising: placing a test internal gear ring 1 blank after quenching and tempering on a platform of a processing device, and through quenching and tempering, the test internal gear ring 1 blank can obtain a good combination of strength and toughness, and improve its hardness and wear resistance; semi-finishing machining of the test internal gear ring 1 blank by a processing device and then milling the teeth; chamfering the test internal gear ring 1 after the teeth are milled and then carburizing at a processing temperature of a first temperature and a processing time of a first time. Quenching processing. Through the arc detection, it can be known that the test inner gear ring 1 after carburizing and quenching has a first arc 11 deformation with an arc R1 due to the high temperature. The bulge of the first arc 11 is S. The value of the arc R1 is recorded, and the arc R2 matching the arc R1 is calculated. Before processing the product inner gear ring 2, the deformation parameters of the inner gear ring during the carburizing and quenching process are first determined by testing the inner gear ring 1, so as to facilitate the subsequent anti-deformation treatment of the product inner gear ring 2 in the process of processing the product inner gear ring 2; when processing the product inner gear ring During the process of ring 2, the product inner gear ring 2 blank after quenching and tempering is placed on the platform of the processing equipment; the product inner gear ring 2 blank is semi-finished by the processing equipment and then milled, and a second arc 21 with an arc R2 is processed on the product inner gear ring 2 during the milling process, and the second arc 21 is the opposite first arc 11; the product inner gear ring 2 after milling is chamfered and then carburized and quenched at a processing temperature of the first temperature and a processing time of the first time, and the processing temperature and processing time are equal to the processing temperature and processing time of the test inner gear ring 1. In this way, the first arc 11 generated by the high-temperature deformation of the product inner gear ring 2 after carburizing and quenching can offset each other with the second arc 21 processed during the milling process, thereby meeting the use standard of the inner gear ring; the product inner gear ring 2 is placed on the processing equipment for fine turning, and then grinding; finally, the processed product inner gear ring 2 is inspected and put into storage. If you want to process inner gear rings of other specifications and sizes, you only need to process them according to the above process.

[0036] As a specific implementation, in the processing technology for large carburized and quenched internal gear rings of the present invention, the radian detection step includes tooth top circle detection, outer circle detection, and tooth portion detection.

[0037] As a specific implementation method, in the processing technology for large carburized and quenched internal gear rings of the present invention, the tooth top circle detection process is: use a caliper to measure the curvature d1 at 8 to 12 mm from the top end face along the tooth width direction, the curvature d2 at the center position in the width direction, and the curvature d3 at 8 to 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 processing technology for large carburized and quenched internal gear rings of the present invention, the relationship between the tooth top 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 method, in the processing technology for large carburized and quenched internal gear rings of the present invention, the outer circle detection process is: use a caliper to measure the arc D1 at 8 to 12 mm from the top end face along the tooth width direction of the outer circle, the arc D2 at the center position in the width direction, and the arc D3 at 8 to 12 mm from the bottom end face. More specifically, the D1 measurement position is 10 mm from the top end face of the inner gear ring, and the D3 measurement position is 10 mm from the bottom end face of the inner gear ring.

[0040] As a specific embodiment, in the processing technology for large carburized and quenched internal gear rings of the present invention, the tooth detection process is: the arc of the tooth at 8 to 12 mm from the top end face is measured by rod spacing as d'1, the arc at the center position in the width direction is d'2, and the arc at 8 to 12 mm from the bottom end face is d'3. More specifically, the d'1 measurement position is 10 mm from the top end face of the internal gear ring, and the d'3 measurement position is 10 mm from the bottom end face of the internal gear ring.

[0041] As a specific embodiment, in the processing technology for large carburized and quenched internal gear rings of the present invention, the relationship between the curvature R' of the tooth portion is S'=(d'1+d'3) / 2-d'2, R'*R'=(R'-S')*(R'-S')+b*b / 4, wherein S' is the bulge of the tooth portion during the deformation process, and b is the tooth width.

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

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

[0044] Before processing the product inner gear ring 2, the present invention performs carburizing and quenching treatment on a test inner gear ring 1 that is equivalent to the product inner gear ring 2, detects the curvature of a first arc 11 generated by high-temperature deformation of the test inner gear ring 1, and utilizes the reverse deformation principle to process a second arc 21 matching the first arc 11 on the product inner gear ring 2 during the gear milling process, thereby fully ensuring that the tooth top circle of the product inner gear ring 2 after carburizing and quenching deformation basically meets the requirements of the drawing, the tooth allowance is uniform, the grinding allowance is reduced, the available tooth root circle can meet the requirements, and the production efficiency of the inner gear ring is greatly improved.

[0045] It should be noted that, in this article, unless otherwise clearly specified and limited, the term "connection" or its synonyms should be understood in a broad sense. 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 directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. Moreover, expressions such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. At the same time, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state 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, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A processing technology for large carburized and quenched internal gear rings, characterized in that: include: Place the quenched and tempered test internal gear blank on the platform of the processing equipment; The test inner gear ring blank is semi-finished turned by the processing equipment and then gear milled; The test inner gear ring after gear milling is subjected to chamfering and then carburizing and quenching processing at a first temperature and a first time. It can be seen from the arc detection that the test inner gear ring after carburizing and quenching generates a first arc deformation with an arc R1 due to the high temperature, and 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; Place the quenched and tempered inner gear ring blank on the platform of the processing equipment; The inner gear ring blank of the product is semi-finished by the processing equipment and then subjected to gear milling, and the second arc with an arc of R2 is processed on the inner gear ring during the gear milling process; Carburizing and quenching the inner gear ring of the product after gear milling at the first temperature and the first time; Placing the inner gear ring of the product on the processing equipment for fine turning, and then grinding the gears; Finally, the processed inner gear ring is inspected and put into storage.

2. The processing technology for large carburized and quenched internal gear ring according to claim 1, characterized in that: The arc detection step includes tooth top circle detection, outer circle detection, and tooth part detection.

3. The processing technology for large carburized and quenched internal gear ring according to claim 2, characterized in that: The tooth top circle detection process is: using a caliper to measure the arc d1 at 8 to 12 mm from the top end face along the tooth width direction, the arc d2 at the center position in the width direction, and the arc d3 at 8 to 12 mm from the bottom end face.

4. The processing technology for large carburized and quenched internal gear ring according to claim 3, characterized in that: The relationship formula of the tooth top arc R is S=(d1+d3) / 2-d2, R*R=(RS)*(RS)+b*b / 4, where b is the tooth width.

5. The processing technology for large carburized and quenched internal gear ring according to claim 2, characterized in that: The outer circle detection process is: using a caliper to measure the arc D1 at 8 to 12 mm from the top end face along the tooth width direction, the arc D2 at the center position in the width direction, and the arc D3 at 8 to 12 mm from the bottom end face.

6. The processing technology for large carburized and quenched internal gear ring according to claim 2, characterized in that: The tooth detection process is as follows: the tooth is measured by rod spacing to determine that the arc at 8 to 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 at 8 to 12 mm from the bottom end face is d'3.

7. The processing technology for large carburized and quenched internal gear ring according to claim 6, characterized in that: The relationship between the tooth curvature R' is S'=(d'1+d'3) / 2-d'2, R'*R'=(R'-S')*(R'-S')+b*b / 4, wherein S' is the bulge of the tooth during deformation, and b is the tooth width.

8. The processing technology for large carburized and quenched internal gear ring according to claim 1, characterized in that: During the arc detection process, 3 to 6 detection positions need to be evenly selected along the circumference of the inner gear ring to perform the arc detection.

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