A special-shaped thin-wall brake gear and a manufacturing method thereof
By adopting forging, heat treatment and shot blasting processes in the manufacturing process of thin-walled braking gears, combined with the finishing process of the splicing mandrel, the problems of thin-walled parts are solved, and the rigidity of the gear is improved and processing stability.
Patent Information
- Application Number
- CN201811266798.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2018-10-29
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2038-10-29
AI Technical Summary
In the prior art, there are deformation problems during the processing of thin-walled parts, resulting in low accuracy and poor consistency. In particular, the thin-walled brake gears of special-shaped thin-walled parts are insufficiently rigid and easily deformed during processing.
A special-shaped thin-walled braking gear and its manufacturing method are adopted, including forging, isothermal normalizing, rough turning, precision turning, tooth forming insertion, milling groove processing, heat treatment, shot blasting, finishing inner holes and end faces, The process of finishing the outer circle, the teeth grinding part and the six-segment grooves can improve the hardness and rigidity of the gears through carburizing and quenching and shot blasting, and the outer circle is refined by using the expansion sleeve mandrel during the tooth insertion process. Controls deformation of parts.
It effectively improves the rigidity of thin-walled parts, reduces elastic deformation and uneven positioning problems during processing, and ensures the stability and accuracy of the gears during processing.
Smart Images
Figure CN109139869B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a workpiece heat treatment and processing control method, in particular to a special-shaped thin-wall brake gear and a manufacturing method thereof. Background Art
[0002] Thin-walled parts have been increasingly widely used in various industrial sectors, and the demand has been rising with the development of industry. Thin-walled parts, especially thin-walled special-shaped parts with high surface finish requirements, have small wall thickness, poor rigidity, and complex shapes. They are prone to large deformation during clamping, which affects their processing accuracy. In the past, the processing of thin-walled parts required multiple corrections, and the product had low precision and poor consistency, and could not solve the problem of processing deformation.
[0003] In the prior art, brake gears are often used in thin-walled parts. The thin-wall rigidity of the brake gears of special-shaped thin-walled parts is weak, and the gears are easily deformed during processing. Therefore, the present invention proposes a brake gear of special-shaped thin-walled parts and a manufacturing method thereof. Summary of the invention
[0004] The purpose of the present invention is to solve the problems in the prior art and to propose a special-shaped thin-wall brake gear and a manufacturing method thereof.
[0005] In order to achieve the above object, the present invention adopts the following technical solutions:
[0006] A special-shaped thin-wall brake gear comprises a gear body, wherein the gear body comprises an inner circle and an outer circle, wherein the inner side of the inner circle is provided with an inner hole, the outer side is provided with six equally divided grooves, and the outer circle is provided with six external teeth, and the outer circle is arranged outside the inner circle.
[0007] Preferably, the manufacturing method of the special-shaped thin-walled brake gear comprises the following specific steps:
[0008] Forging → isothermal normalizing → rough turning → fine turning → tooth forming and gear shaping → slot milling center milling machine → rough milling of six-equal slots and pre-milling → heat treatment → shot blasting → finishing of inner hole and end face → finishing of outer circle → fine grinding of teeth → finishing of six-equal slots → completion inspection.
[0009] Preferably, carburizing and quenching are used during the heat treatment, and the heat treatment is performed first and then the fine turning is performed. The shot blasting treatment utilizes the centrifugal force of the impeller on the blasting head of the shot blasting machine when rotating at a high speed to shoot the abrasive at a very high linear speed onto the gear surface after the heat treatment.
[0010] Preferably, the rough milling of the six-equal-divided slots and the finishing of the six-equal-divided slots both use inner and outer circle tensioning fixtures.
[0011] Preferably, the rough turning is to cut off most of the machining allowance of the machining surface of the part; and the fine turning is to cut the part according to the overall size and technology of the part.
[0012] Preferably, during the gear inserting process, the outer teeth are inserted by positioning the inner hole.
[0013] Preferably, a margin is left on the outer circle before the gear shaping, and the groove is milled after the gear shaping, and the outer circle is finished with an expansion sleeve mandrel.
[0014] Preferably, the effective depth of the hardened layer of the gear body is 0.59-1.01 mm, the tooth surface hardness of the gear body is 58-64 HRC, and the core hardness of the gear body is 33-48 HRC.
[0015] Preferably, the grooves formed on the outer side of the inner circle are not limited to being divided into six equal parts, and any gear with the number of groove divisions ≥ 2 can be processed.
[0016] Compared with the prior art, the present invention provides a special-shaped thin-wall brake gear and a manufacturing method thereof, which has the following beneficial effects:
[0017] By using internal and external circle tightening fixtures for finishing the inner hole and end face and finishing the six equally divided grooves, it is possible to groove when the wall is very thin, and the wall is not easy to deform, further improving the rigidity of the thin wall of the brake gear of the special-shaped thin-walled part, and reducing the elastic deformation generated during the processing, solving the problem that the uneven position of the six grooves is easily caused by the different sizes of the inner holes;
[0018] Before shaping the gear, an allowance is left on the outer circle, and the groove is milled after shaping the gear. The outer circle is finished with an expansion sleeve mandrel to prevent deformation of the thin wall of the part during shaping the gear. The runout of the outer circle to the inner hole is ensured to be within 0.02mm, and deformation of the gear can be prevented during processing.
[0019] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. The present invention has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 A structural diagram of a special-shaped thin-wall brake gear proposed by the present invention;
[0021] Figure 2 A side view of a gear body of a special-shaped thin-walled brake gear proposed by the present invention;
[0022] Figure 3 This is a front view of the gear body of a special-shaped thin-walled brake gear proposed by the present invention.
[0023] In the figure: 1. gear body; 2. inner hole; 3. outer teeth; 4. inner circle; 5. outer circle. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.
[0025] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0026] Example 1
[0027] like Figure 1-3 As shown, a special-shaped thin-walled brake gear includes a gear body 1, which includes an inner circle 4 and an outer circle 5. The inner side of the inner circle 4 is provided with an inner hole 2, and the outer side is provided with six equally divided grooves. Six external teeth 3 are provided on the outer circle 5, and the outer circle 5 is arranged on the outer side of the inner circle 4.
[0028] The manufacturing method of the special-shaped thin-walled brake gear comprises the following specific steps:
[0029] Forging → isothermal normalizing → rough turning → fine turning → tooth forming and gear shaping → slot milling center milling machine → rough milling of six-equal slots and pre-milling → heat treatment → shot blasting → finishing of inner hole and end face → finishing of outer circle → fine grinding of teeth → finishing of six-equal slots → completion inspection.
[0030] The heat treatment adopts carburizing and quenching, and the heat treatment is performed first and then the precision machining is performed to avoid the deformation of the thin-walled parts during heat treatment, which leads to low yield.
[0031] The shot blasting process utilizes the centrifugal force of the impeller on the shot blasting head of the shot blasting machine when it rotates at a high speed, and shoots the abrasive at a very high linear velocity to the surface of the gear after heat treatment. The shot blasting process utilizes the centrifugal force of the impeller on the shot blasting head of the shot blasting machine when it rotates at a high speed, and shoots the abrasive at a very high linear velocity to the surface of the gear after heat treatment, producing a striking and grinding effect, removing the oxide scale and rust on the gear surface, and producing a certain degree of roughness.
[0032] The rough milling of the six-equal groove pre-milling and the finishing of the six-equal groove both use inner and outer circle tensioning tooling, which can groove when the wall is very thin and the wall is not easily deformed, further improving the rigidity of the thin wall of the brake gear of the special-shaped thin-walled part, and can also reduce the elastic deformation generated during the processing, solving the problem of uneven position of the six grooves caused by different sizes of inner holes.
[0033] The rough turning is to remove most of the machining allowance on the machining surface of the part; the fine turning is to cut the part according to the entire size and technology of the part.
[0034] During the gear inserting process, the outer teeth are inserted by positioning the inner hole to ensure the coaxiality of the outer teeth 3 with the inner hole 2.
[0035] The outer circle is left with an allowance before gear shaping, and the groove is milled after gear shaping. The outer circle 5 is finely finished with an expansion sleeve mandrel to prevent deformation of the part due to thin wall during gear shaping, ensure that the runout of the outer circle 5 to the inner hole 2 is within 0.02mm, and prevent deformation of the gear during processing.
[0036] The effective depth of the hardened layer of the gear body is 0.59-1.01 mm, the tooth surface hardness of the gear body is 58-64 HRC, and the core hardness of the gear body is 33-48 HRC.
[0037] The grooves formed on the outer side of the inner circle 4 are not limited to being divided into six equal parts, and any gear with the number of grooves divided into 2 or more can be processed.
[0038] It should be noted that the rough milling of the six-equal groove pre-milling and the finishing of the six-equal groove of the present invention both use inner and outer circle tensioning fixtures, which can be used to groove when the wall is very thin, and the wall is not easy to deform, further improving the rigidity of the thin wall of the special-shaped thin-walled brake gear, and can also reduce the elastic deformation generated during the processing, solving the problem that the different sizes of the inner hole 2 easily lead to uneven position of the six grooves;
[0039] Before shaping the gear, an allowance is left on the outer circle 5, and the groove is milled after shaping the gear. The outer circle 5 is finished with an expansion sleeve mandrel to prevent deformation of the thin wall of the part during shaping the gear. Ensure that the runout of the outer circle 5 to the inner hole 2 is within 0.02mm, and prevent deformation of the gear during processing.
[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A method for manufacturing a special-shaped thin-wall brake gear, the special-shaped thin-wall brake gear comprising a gear body (1), characterized in that: The gear body (1) comprises an inner circle (4) and an outer circle (5); an inner hole (2) is provided on the inner side of the inner circle (4), and a six-equally divided groove is provided on the outer side; six external teeth (3) are provided on the outer circle (5); and the outer circle (5) is arranged on the outer side of the inner circle (4); A method for manufacturing a special-shaped thin-wall brake gear, the specific steps are as follows: Forging → isothermal normalizing → rough turning → fine turning → gear forming and shaping → slot milling center milling machine → rough milling of six-equal slots and pre-milling → heat treatment → shot blasting → finishing of inner hole and end face → finishing of outer circle → fine grinding of teeth → finishing of six-equal slots → completion inspection; The heat treatment adopts carburizing and quenching, and the heat treatment is performed first and then the fine turning is performed. The shot blasting treatment utilizes the centrifugal force of the impeller on the blasting head of the shot blasting machine when rotating at a high speed to shoot the abrasive at a very high linear speed to the surface of the gear after the heat treatment; The rough milling of six-equal-divided slots and the finishing of six-equal-divided slots both use inner and outer circle tensioning fixtures; The rough turning is to cut off most of the machining allowance of the machining surface of the part, and the finishing turning is to cut the part according to the full size and technology of the part; During the gear inserting process, the inner hole (2) is used to position and insert the outer teeth (3); The outer circle (5) is provided with a margin before the gear shaping, and the groove is milled after the gear shaping, and the outer circle (5) is finely finished using an expansion sleeve mandrel.
2. The method for manufacturing a special-shaped thin-wall brake gear according to claim 1, characterized in that: The effective depth of the hardened layer of the gear body (1) is 0.59-1.01 mm, the tooth surface hardness of the gear body (1) is 58-64 HRC, and the core hardness of the gear body (1) is 33-48 HRC.
3. The method for manufacturing a special-shaped thin-wall brake gear according to claim 1, characterized in that: The grooves formed on the outer side of the inner circle (4) are not limited to being divided into six equal parts, and any gear with a number of grooves divided into ≥2 can be processed.