Processing method of jaw type part after heat treatment

Abstract

The invention belongs to the technical field of machinery, and relates to a method for processing a jaw part after heat treatment, which comprises the following steps of: axially positioning the jaw part by fitting a positioning surface on an airtight positioning seat fixedly connected to a back-pull chuck with a positioning end surface which is processed before heat treatment in the jaw part; the outer circle of the jaw type part is clamped through the clamping jaw installed on the rear pull type chuck so that clamping and positioning of the jaw type part can be completed, and then machining of two installation positioning faces and an inner hole is conducted on the jaw type part subjected to clamping and positioning through a cutter. According to the jaw type part machining tool, one-time clamping of a jaw type part is achieved, then machining of two installation positioning faces and an inner hole is completed at the same time in one-time machining, and therefore the machining precision and the production efficiency of the jaw type part are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of machinery and relates to a method for processing a tooth-embedded part after heat treatment. Background Art

[0002] In the precision field of mechanical manufacturing, the processing of tooth-embedded parts has always been a technical challenge. The traditional processing process involves multiple clamping and complex processing steps to ensure that the installation and positioning surfaces of the parts achieve the required accuracy. Specifically, after heat treatment, the parts must first be positioned by positioning their toothed outer end face or a certain installation and positioning end face, and clamping the outer circle, and then hard turning the other end face (the inner end face or the end face on the side away from the toothed outer end face) and the inner hole. After the processing is completed, the part needs to be turned around, using the end face processed in the previous sequence as the new positioning reference, expanding the inner hole, and hard turning the inner end face that was not processed in the previous processing or the end face on the side away from the toothed outer end face again. This secondary clamping method not only increases the complexity of the processing process, but also seriously affects the stability of the part's accuracy due to the accumulation of clamping errors.

[0003] In order to improve the precision of parts, some processes try to introduce grinding process. Although this can improve the precision problem to a certain extent, it also brings about the increase of processing cost and further complication of the process, thus reducing production efficiency. Therefore, the existing processing technology faces the problems of poor workpiece precision stability and many processing steps, which makes it difficult to meet the urgent needs of modern manufacturing industry for efficient and high-precision processing.

[0004] Based on this, an innovative method for processing heat-treated tooth-embedded parts is urgently needed, which aims to achieve comprehensive processing of parts through one clamping, simplify the processing process, and reduce clamping errors. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a method for processing tooth-embedded parts after heat treatment, clamping the parts once, and completing the processing of two mounting positioning surfaces and inner holes in one processing, thereby improving the processing accuracy and production efficiency of the parts to solve the problems of the background technology.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A method for processing a heat-treated posterior tooth-shaped part comprises the following steps:

[0008] The tooth-embedded part is axially positioned by fitting a positioning surface on an airtight positioning seat fixedly connected to the rear-pull chuck with a positioning end surface of the tooth-embedded part that does not need to be processed, and the outer circle of the tooth-embedded part is clamped by the clamping claws installed on the rear-pull chuck to complete the clamping and positioning of the tooth-embedded part, and then the two installation positioning surfaces and the inner hole of the tooth-embedded part that has completed the clamping and positioning are processed by a tool.

[0009] Furthermore, an airtight detection hole connected to an airtight detection device is provided on the positioning surface of the airtight positioning seat, and the airtight detection hole is fitted with a positioning end surface of the tooth-embedded part that does not need to be processed to block the outlet of the airtight detection hole.

[0010] Furthermore, the positioning end face of the tooth-embedded part that does not need to be processed has teeth, and a plurality of angular positioning blocks matching the teeth are also provided on the positioning surface of the airtight positioning seat, so that the positioning surface of the airtight positioning seat fits with the positioning end face of the tooth-embedded part that does not need to be processed, thereby sealing the airtight detection hole.

[0011] Furthermore, the positioning surface includes three boss surfaces evenly arranged in the circumferential direction on the airtight positioning seat, and the airtight detection holes and the angular positioning blocks are both arranged on the boss surfaces.

[0012] Furthermore, one end of the airtight positioning seat away from the tooth-embedded part is movably connected to one end of a pull sleeve arranged in the rear-pull chuck, and the pull sleeve is provided with an air flow channel connected to the airtight detection hole in the tooth-embedded part, the other end of the pull sleeve is movably connected to a gas injection rod, and the air flow channel is connected to the inner cavity of the gas injection rod, and the inner cavity of the gas injection rod is connected to an airtight detection device, so that the airtight detection device is connected to the airtight detection hole.

[0013] Furthermore, a first O-ring and a second O-ring are respectively provided at the movable connection between the pull sleeve, the gas injection pull rod and the airtight positioning seat to prevent air leakage.

[0014] Furthermore, the rear-pull type chuck is fixedly connected to the front connecting plate of the processing machine tool, and a counterweight hole is reserved in the radial direction of the front connecting plate to facilitate weight-added balancing during online dynamic balancing of the processing machine tool.

[0015] The beneficial effects of the present invention are:

[0016] The present invention provides a processing method for a threaded part after heat treatment, wherein the end face with teeth in the threaded part is used as a positioning end face to cooperate with an airtight positioning seat and a rear-pull type chuck to clamp the outer circle of the threaded part, thereby providing an axial force toward the airtight positioning seat while clamping the threaded part, thereby preventing the part from loosening when the inner end face of the part is processed, thereby affecting the processing accuracy, thereby achieving one-time clamping of the part, and then completing the processing of two installation positioning surfaces and the inner hole in one processing and clamping, thereby improving the processing accuracy and production efficiency of the threaded part;

[0017] An airtight detection hole connected to an airtight detection device is arranged on the positioning surface of the airtight positioning seat that is in contact with the positioning end face, so that airtight detection is performed by injecting gas into the airtight detection hole to ensure the reliability of part clamping and positioning; and an angular positioning block is provided on the positioning surface to achieve clamping error prevention, so that the positioning surface of the airtight positioning seat and the positioning end face of the tooth-embedded part that has been processed before heat treatment can be quickly fitted, so as to improve the clamping efficiency.

[0018] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0020] Figure 1 A schematic diagram of a processing method for a heat-treated tooth-shaped part in an embodiment;

[0021] Figure 2 A schematic side assembly diagram of a method for processing a heat-treated tooth-shaped part in an embodiment;

[0022] Figure 3 It is a front view of the airtight positioning seat in the embodiment;

[0023] Figure 4 It is a side view of the airtight positioning seat in the embodiment.

[0024] Figure numerals: 1-injection rod; 2-first O-ring; 3-pull sleeve; 31-air flow channel; 4-front connecting plate; 5-second O-ring; 6-airtight positioning seat; 7-tool; 8-workpiece; 9-clamp; 10-angular positioning block; 11-airtight detection device; 12-rear pull-type chuck; 13-airtight detection hole. DETAILED DESCRIPTION

[0025] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and the features in the embodiments can be combined with each other without conflict.

[0026] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0027] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is 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 operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] See also Figure 1 to Figure 4 , which is a processing method for tooth-embedded parts after heat treatment, including reliability detection of part clamping and positioning, clamping error prevention, prevention of workpiece loosening when processing the inner end face, and selection of tools and processing parameters;

[0029] The processing device used for the processing method includes a gas injection rod 1, a first O-ring 2, a pull sleeve 3, a front connecting plate 4, a second O-ring 5, an airtight positioning seat 6, a tool 7 (including multiple tools), a clamp 9, an orientation block 10, an airtight detection device 11 and a chuck 12, wherein the airtight detection device 11 is connected to one end of the gas injection rod 1, and the other end of the gas injection rod 1 is slidably sleeved on one end of the pull sleeve 3 and connected to the inner cavity of the pull sleeve 3, and the other end of the pull sleeve 3 is slidably sleeved on one end of the airtight positioning seat 6 and connected to the inner cavity of the airtight positioning seat 6;

[0030] One end of the airtight positioning seat 6 away from the pull sleeve 3 is a positioning surface, and a plurality of airtight detection holes 13 communicating with the inner cavity of the airtight positioning seat 6 and a plurality of angular positioning blocks 10 for positioning with the positioning end surface of the workpiece 8 to be processed are provided on the positioning surface, so that the positioning surface of the airtight positioning seat 6 fits with the positioning end surface of the workpiece 8, thereby blocking the airtight detection holes 13;

[0031] The gas injection rod 1 is arranged in the front connecting plate 4, the back-pull type chuck 12 is fixedly connected to the front end of the front connecting plate 4, the airtight positioning seat 6 is fixedly connected to the front end of the back-pull type chuck 12, and the clamping jaw 9 is movably installed on the back-pull type chuck 12, and performs back-pull clamping under the action of the pull sleeve 3 arranged in the back-pull type chuck 12, thereby clamping the workpiece 8;

[0032] Preferably, an air flow channel 31 is provided in the inner cavity of the pull sleeve 3 to connect the gas injection pull rod 1 and the inner cavity of the airtight positioning seat.

[0033] Preferably, a first O-ring 2 and a second O-ring 5 are respectively sleeved on both ends of the pull sleeve 3 to prevent leakage during ventilation.

[0034] The steps of this processing method are as follows:

[0035] After the machine tool is ready, the workpiece 8 is clamped by the clamping jaws 9 and the airtight positioning seat 6, and the airtight detection device 11 injects airflow into the airtight positioning seat 6 through the gas injection pull rod 1 and the pull sleeve 3. The airtight detection hole 13 on the positioning surface of the airtight positioning seat 6 is blocked by the positioning end face of the workpiece 8 (the positioning end face that has been processed before heat treatment), so as to determine whether the positioning end face of the workpiece 8 is completely in contact with the positioning surface of the airtight positioning seat 6 by detecting the air pressure value, thereby determining the accuracy of the axial positioning.

[0036] In order to prevent leakage during ventilation and affect the airtightness detection and judgment, the first O-ring 2 and the second O-ring 5 are used to increase the sealing during the process.

[0037] Since the workpiece 8 is a tooth-embedded part, its positioning end face is not a complete large plane, so when the workpiece 8 is fitted with the positioning surface of the airtight positioning seat 6, angular positioning is required, otherwise the airtight detection hole 13 may not be blocked, thereby causing an airtight detection alarm, and then the clamping will be repeated many times, which is time-consuming. Therefore, an angular positioning block 10 is installed on the positioning surface of the airtight positioning seat 6, and the protruding side of the angular positioning block 10 is fitted with the tooth side surface of the workpiece 8, and a gap is left on the other side to prevent over-positioning.

[0038] After the positioning end face of the workpiece 8 is completely fitted with the positioning surface of the airtight positioning seat 6, the clamping jaws 9 move obliquely rearward under the action of the pulling sleeve 3, that is, radially move to clamp the outer circle of the workpiece 8, and at the same time give the workpiece 8 an axial force in the direction of the airtight positioning seat 6, so that the positioning surface of the workpiece 8 and the positioning surface of the airtight positioning seat 6 are more reliably fitted. At the same time, when the inner end face of the workpiece 8 is subsequently processed, the workpiece 8 can be prevented from loosening due to the outward force of the tool 7 during processing and separating from the positioning surface of the airtight positioning seat 6; after the clamping jaws 9 clamp the workpiece 8, the end face, inner hole and inner end face of the workpiece 8 are processed by the tool 7.

[0039] Since the machining process involves high-speed rotation machining, machining iron chips, thermal deformation of the workpiece, durability of the blade and other issues; furthermore, the clamp 9 adopts three-jaws, and the gap between the three jaws facilitates the discharge of iron chips; the airtight positioning seat 6 supports the workpiece 8 at three points (that is, the positioning surface includes three boss surfaces evenly arranged in the circumferential direction on the airtight positioning seat, and the airtight detection holes and angular positioning blocks are arranged on the boss surfaces), so that the internal space height is higher after the workpiece 8 is clamped, thereby avoiding motion interference with the tool 7 (the tool for machining the inner end surface) and facilitating chip removal.

[0040] During the machining process, the parts connected to the workpiece rotate at high speed, which places high demands on dynamic balancing. Therefore, threaded holes are prefabricated radially on the 4 circumferences of the front plate to facilitate weighted balancing during dynamic balancing.

[0041] During the processing, the workpiece 8 may experience thermal deformation or poor blade durability, and then the tool 7 uses a central water outlet method or selects other cooling methods that can fully cool the workpiece 8 and the tool 7 according to the workpiece 8, and selects suitable processing blades and suitable processing parameters to achieve "turning instead of grinding".

[0042] Preferably, before clamping the workpiece 8, the positioning surface of the airtight positioning seat 6 is first fine-machined by a tool, and then the angular positioning block 10 is installed on the positioning surface, and finally the workpiece 8 is clamped, thereby ensuring accurate positioning of the workpiece 8.

[0043] In summary, the present invention can perform one-time clamping and positioning of the hot-post-threaded parts to complete the processing of each processing surface in the workpiece 8, avoiding the clamping error caused by multiple clamping and achieving efficient and high-precision processing of the workpiece 8.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A method for processing a heat-treated tooth-shaped part, characterized in that: The following steps are involved: The tooth-embedded part is axially positioned by fitting the positioning surface on the airtight positioning seat fixedly connected to the rear-pull chuck with the positioning end surface of the tooth-embedded part that has been processed before heat treatment, and the outer circle of the tooth-embedded part is clamped by the clamping claws installed on the rear-pull chuck to complete the clamping and positioning of the tooth-embedded part, and then the two installation positioning surfaces and the inner hole of the tooth-embedded part that has been clamped and positioned are processed by a tool.

2. The method for processing a heat-treated tooth-shaped part according to claim 1, characterized in that: An airtight detection hole connected to an airtight detection device is provided on the positioning surface of the airtight positioning seat, and the airtight detection hole is fitted with the positioning end surface of the tooth-embedded part that has been processed before heat treatment to block the outlet of the airtight detection hole.

3. The method for processing a heat-treated tooth-shaped part according to claim 2, characterized in that: The positioning end face of the tooth-embedded part that has been processed before the heat treatment has teeth, and a plurality of angular positioning blocks matching the teeth are provided on the positioning surface of the airtight positioning seat to achieve the purpose of clamping error prevention, so that the positioning surface of the airtight positioning seat and the positioning end face of the tooth-embedded part that has been processed before the heat treatment can be quickly fitted.

4. The method for processing a heat-treated tooth-shaped part according to claim 3, characterized in that: The positioning surface comprises three boss surfaces which are evenly arranged in the circumferential direction on the airtight positioning seat, and the airtight detection holes and the angular positioning blocks are both arranged on the boss surfaces.

5. The method for processing a heat-treated tooth-shaped part according to claim 2, characterized in that: One end of the airtight positioning seat away from the tooth-embedded part is movably connected to one end of a pull sleeve arranged in the rear-pull chuck, and the pull sleeve is provided with an air flow channel connected to the airtight detection hole in the tooth-embedded part, the other end of the pull sleeve is movably connected to a gas injection rod, and the air flow channel is connected to the inner cavity of the gas injection rod, and the inner cavity of the gas injection rod is connected to an airtight detection device, so that the airtight detection device is connected to the airtight detection hole.

6. The method for processing a heat-treated tooth-shaped part according to claim 5, characterized in that: A first O-type sealing ring and a second O-type sealing ring are respectively provided at the movable connection between the pull sleeve, the gas injection pull rod and the airtight positioning seat to prevent air flow leakage.

7. The method for processing a heat-treated tooth-shaped part according to claim 5, characterized in that: The rear-pull type chuck is fixedly connected to the front connecting plate of the processing machine tool, and a counterweight hole is reserved in the radial direction of the front connecting plate to facilitate weight-added balancing during online dynamic balancing of the processing machine tool.

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