阅读说明：本技术 基于摩擦驱动的大展长齿轮渐开线样板纯滚动展成装置 (Large-extension-length gear involute template pure rolling generating device based on friction driving ) 是由 凌四营 刘祥生 凌明 任泓霖 杨洋 王立鼎 于 2021-06-30 设计创作，主要内容包括：本发明属于精密齿轮加工与测试技术领域,涉及基于摩擦驱动的大展长齿轮渐开线样板纯滚动展成装置,用于生成渐开线的加工与测量基准。包括滚动组件、导轨组件和摩擦驱动机构三部分。滚动组件包括大展开长度齿轮渐开线样板、芯轴、样板密珠轴套、大基圆盘、平行套筒、密珠轴套、平垫圈、十字垫圈和锁紧螺母；导轨组件包括底座、基圆盘定位挡板、导轨、挡板、导轨定位板、铜垫片、连接螺钉和紧定螺钉；摩擦驱动机构包括摩擦块、电动直线滑台、立柱滑台、立柱底座、转接板；加工和测量渐开线无原理性误差,可用于1级精度大展开长度齿轮渐开线样板的加工与测量领域,具有良好的市场应用前景与推广价值。(The invention belongs to the technical field of precision gear machining and testing, and relates to a friction-drive-based pure rolling generating device for an involute template of a large-span-length gear, which is used for generating machining and measuring reference of an involute. The device comprises a rolling assembly, a guide rail assembly and a friction driving mechanism. The rolling assembly comprises a large-expansion-length gear involute sample plate, a core shaft, a sample plate ball-sealing shaft sleeve, a large base disc, a parallel sleeve, a ball-sealing shaft sleeve, a flat washer, a cross washer and a locking nut; the guide rail assembly comprises a base, a base disc positioning baffle, a guide rail, a baffle, a guide rail positioning plate, a copper gasket, a connecting screw and a set screw; the friction driving mechanism comprises a friction block, an electric linear sliding table, an upright column base and an adapter plate; the involute is processed and measured without principle error, can be used in the field of processing and measuring 1-level precision large-expansion-length gear involute sample plates, and has good market application prospect and popularization value.)

1. Big extension gear involute model pure roll generates device based on friction drive, its characterized in that includes: the device comprises a rolling assembly, a guide rail assembly and a friction driving mechanism;

wherein the rolling assembly comprises: the large-expansion-length gear involute template comprises a large-expansion-length gear involute template (15), a template dense-bead shaft sleeve (16), a mandrel (17), a left base disc (9), a right base disc (23), a left parallel sleeve (14), a right parallel sleeve (18), a left dense-bead shaft sleeve (13), a right dense-bead shaft sleeve (19), a left flat washer (12), a right flat washer (20), a left cross washer (11), a right cross washer (21), a left locking nut (10) and a right locking nut (22); the mandrel (17) is a radial installation reference of the whole rolling assembly, the middle part of the mandrel is a cylindrical surface, and the two ends of the mandrel are fine threads; the left base disc and the right base disc are respectively positioned and assembled with the mandrel (17) through a left dense bead shaft sleeve (13) and a right dense bead shaft sleeve (19) and are positioned at the two ends of the mandrel; the large-expansion-length gear involute sample plate is positioned and assembled with a mandrel (17) through a sample plate dense-bead shaft sleeve (16) and is positioned in the middle of the mandrel; the left parallel sleeve (14), the right parallel sleeve (18) and the mandrel (17) are in clearance fit; the positioning surfaces at one ends of the left and right parallel sleeves are respectively attached and positioned with the end surface of a gear involute sample plate (15) with large expansion length, and the positioning surfaces at the other ends are respectively attached and positioned with the axial positioning small end surfaces (9-4) of the left and right base discs, so that the axial positioning precision of the left and right base discs and the gear involute sample plate workpiece with large expansion length is ensured; the left end and the right end of the mandrel (17) are sequentially locked with the outer end face of the left base disc (9) through a left locking nut (10), a left cross washer (11) and a left flat washer (12) from outside to inside, and the outer end face of the right base disc (23) is locked with a right locking nut (22), a right cross washer (21) and a right flat washer (20);

the guide rail assembly includes: the base (2), a left guide rail (4), a right guide rail (25), a left baffle (3), a right baffle (26), a left guide rail positioning plate (8), a right guide rail positioning plate (24) and a base disc positioning baffle (27); the base (2) is of a U-shaped structure, and the top surface of a protruding structure of the base is a guide rail positioning surface; the left guide rail and the right guide rail are stretching bodies with thin waist-shaped sections, and the sections are vertically symmetrical and bilaterally symmetrical; the left guide rail and the right guide rail are respectively fixed on the guide rail positioning surface of the base through the left baffle plate, the right baffle plate, the left guide rail positioning plate and the right guide rail positioning plate; the base disc positioning baffle (27) is fixed on the platform (1) and is used for positioning the end surfaces of the base (2) and the left and right guide rails; the top surface of the guide rail is a working surface, and the rolling assembly performs pure rolling generating motion on the top surface of the guide rail;

the friction driving mechanism comprises a friction block (28), an electric linear sliding table (29), an adapter plate (30), an upright column sliding table (31) and an upright column base (32); the friction block (28) consists of a rigid friction block base body (28-1) and a flexible friction pad (28-2), the friction block (28) is installed on the electric linear sliding table (29), and the friction pad (28-2) is elastically pressed with the outer cylindrical surfaces of the left base disc (9) and the right base disc (23) respectively; electric linear sliding table (29) is installed on stand sliding table (31) through adapter plate (30), and stand sliding table (31) is installed on stand base (32), and stand base (32) are installed on platform (1), and electric linear sliding table (29) drives friction block (28) motion, and then utilizes the friction to drive the rolling subassembly and do the pure motion of rolling exhibition on the guide rail subassembly.

2. The friction drive-based large-span gear involute template pure rolling generating device is characterized in that the cross section shapes of the left guide rail and the right guide rail are a wide rectangle, an inverted trapezoid, a narrow rectangle, a trapezoid and a wide rectangle from top to bottom; the included angle between the lateral inclined plane (4-5) of the guide rail and the bottom surface (4-4) or the top surface (4-6) of the guide rail is 60-80 degrees; the middle rectangular area of the lateral direction of the guide rail is provided with guide rail connecting holes (4-3) which are uniformly distributed, and the left guide rail and the right guide rail are connected together by utilizing the guide rail connecting holes to be synchronously processed and detected.

3. The friction drive-based large-span gear involute template pure rolling generating device is characterized in that the guide rail assembly further comprises a copper gasket (7), a connecting screw (6) and a guide rail fastening screw (5); a row of through holes and a row of threaded holes are respectively formed in the left baffle plate, the right baffle plate, the left guide rail positioning plate and the right guide rail positioning plate and are respectively used for connecting a connecting screw (6) and a guide rail fastening screw (5); the guide rail set screw (5) applies acting force to the lateral inclined planes (4-5) of the guide rail through the copper gasket (7), the left guide rail and the right guide rail tightly press the guide rail positioning plate through horizontal component force, and the left guide rail and the right guide rail tightly press the base (2) through vertical downward component force, so that the reliability of guide rail positioning is ensured.

4. The friction drive-based pure rolling generating device for the large-span gear involute template of claim 1, wherein the left base disc and the right base disc are of a non-full-circle integrated structure and consistent in size; web plate holes (9-3) are uniformly distributed on the middle web plate of the left base disc and the right base disc; the left base circular disc and the right base circular disc are provided with two sections of concentric equal-diameter outer cylindrical surfaces (9-1) and a reference inner hole (9-2) which are symmetrically arranged, the outer cylindrical surface at one end is a generated reference cylindrical surface, and the outer cylindrical surface at the other end is a friction driving cylindrical surface; the central angle corresponding to the outer cylindrical surface (9-1) is 10% larger than the corresponding design expansion angle of the gear involute template (15) with large expansion length; the lateral reference surface (9-6) is parallel to the central axis of the reference inner hole (9-2); when assembled into a rolling assembly, the lateral reference surfaces (9-6) of the left and right base discs are coplanar.

5. The pure rolling generating device of the involute template of the large-spreading-length gear based on friction drive as claimed in claim 1, wherein the involute template (15) of the large-spreading-length gear has an isometric normal structure, and the left and right different-side involute tooth surfaces (15-1) at each end of the involute template of the large-spreading-length gear are in an isometric normal structure; the reference inner hole (15-5) is used for radial positioning of the gear involute template with the large expansion length; the reference end surfaces (15-4) are used for axially positioning the involute template of the large-expansion-length gear, and the two reference end surfaces are parallel and vertical to the central axis of the reference inner hole; the reference outer cylindrical surface (15-3) is an installation reference of the large-expansion-length gear involute template during magnitude transmission and is coaxial with the reference inner hole; the web plate is provided with a plurality of symmetrical weight-reducing grooves (15-2) which are convenient for reducing the weight of the involute template of the gear with large expansion length.

6. The pure rolling generating device of the large-spread-length gear involute template based on friction driving as claimed in claim 1 is characterized in that when a rolling assembly is assembled, a left dense-bead shaft sleeve (13), a left base disc (9), a left flat washer (12), a left cross washer (11) and a left locking nut (10) are sequentially arranged at one end of a mandrel, then the left base disc (9) is placed on a reference plane, a lateral reference plane is in contact with the reference plane, and then a left parallel sleeve (14), a template dense-bead shaft sleeve (16), a large-spread-length gear involute template (15), a right parallel sleeve (18), a right dense-bead shaft sleeve (19), a right base disc (23), a right flat washer (12), a right cross washer (21) and a right locking nut (22) are sequentially arranged; and adjusting the position of the involute template of the gear with the large expansion length to enable the central axis of the involute template to be aligned with the central axes of the left and right large base discs, and synchronously screwing the left and right locking nuts.

7. The pure rolling generating device of the large-spreading-length gear involute template based on friction driving as claimed in claim 1, wherein the left and right dense-bead shaft sleeves and the sample dense-bead shaft sleeve are bearing steel balls of G3 or G5 grade, and unilateral interference between the mandrel and the reference inner holes of the left and right base disks and the reference inner hole of the large-spreading-length gear involute template is 1-3 μm.

8. The friction-drive-based large-span gear involute template pure rolling generating device is characterized in that the base (2) is U-shaped, nuts are embedded on two side faces of the base and used for being connected with the left baffle, the right baffle, the left guide rail positioning plate and the right guide rail positioning plate; the upper surface of the base is an installation reference surface of the left guide rail and the right guide rail; the base is fixed on the platform (1) through gluing or screw connection; the platform is embedded with nuts for installing the base and the base disc positioning baffle (27).

9. The friction-drive-based large-span gear involute template pure rolling generating device is characterized in that the base disc positioning baffle (27) is an L-shaped stretching body, a baffle groove is formed in the middle in the stretching direction, the side face is a base disc positioning face, and when the rolling assembly is installed on the guide rail assembly, the lateral reference faces of the left base disc and the right base disc are parallel to the base disc positioning face; the bottom surface of the base disc positioning baffle is an installation reference surface of the base disc positioning baffle, and 1-3 rows of baffles are connected with the counter bores on the bottom surface.

10. The friction drive based high elongation gear involute form pure rolling generating device of claim 1 wherein the entire rail assembly is assembled and then aged to relieve residual stress and assembly stress of the assembly and then the top surface of the rail is ground.

Technical Field

The invention belongs to the technical field of precision gear machining and testing, and relates to a friction drive-based pure rolling generating device for an involute template of a large-span length gear, which is used for generating an involute machining and measuring reference.

Background

The involute profile is the gear profile which is most commonly used and mature in machining process at present, and is widely applied to various fields of speed reducers/transmissions, gear cutters, high-end equipment, industrial robots and the like. The device representing the highest machining accuracy of the gear involute is a gear involute template used as a reference for gear involute magnitude transmission. The gear involute sample plate is a standard measuring instrument for calibrating various involute measuring instruments and is mainly used for transmitting gear involute parameter values, correcting instrument indication values and determining instrument indication value errors.

The invention patent (ZL 201510091994.7) discloses a high-precision radial adjustable gear involute template and an adjusting method thereof, and provides a method for adjusting the installation eccentricity of the gear involute template on a mandrel, so that the tooth profile inclination deviation of three tooth surfaces can be adjusted to be consistent at most; the invention patent ZL201610847011.2 discloses a gear wheel involute template which is composed of an involute template block, a sector base circle block and an auxiliary support ball head screw, although the template structure has a simple structure when used for manufacturing the gear involute template with large base circle parameters. The gear involute template has the advantages of small mass, but because a rotation center is not designed, the center of the base circle of the gear involute template is determined by the outer cylindrical surface of the base circle disc, so that a large error is brought, and the use precision of the gear involute template with the structure is influenced. Patent [ zl201711393983.x ] discloses a self-mounting reference equal common normal line gear involute template, wherein left and right tooth surfaces of the gear involute template with the structure have equal common normal line structures, a reference inner hole and a reference end surface are arranged, the gear involute template with the structure has an axisymmetric structure, and the characteristics enable the gear involute template with the structure to have better service performance and easily obtain high machining precision. The disclosed patents all mention a new structure of a gear involute template, but none relate to a specific device and method for processing and detecting the gear involute template.

China's current gear involute sample plate national standard GB/T6467-The grade 1 and 2 of the gear involute template are specified. Tooth profile shape tolerance f of 1-grade gear involute template_fαTCorresponding to the base radius r_b≤100mm、100mm<r_b≤200mm、200mm<r_bLess than or equal to 300mm and 300mm<r_bLess than or equal to 400mm is respectively 1.0 μm, 1.4 μm, 1.7 μm and 2.1 μm; the design development length corresponds to the base radius r_b100mm, 200mm, 300mm, 400mm should be no less than 70mm, 105mm, 140mm and 160 mm; the surface roughness of the profile surface of the involute teeth is not more than Ra 0.1. The existing gear involute template identification regulation JJG 332 and 2003 in China only stipulate the radius r of a base circle_bThe detection specification of the involute template of the gear less than or equal to 200mm and the design extension length corresponding to different base circle radiuses. The gear involute sample plate with large expansion length refers to a gear involute sample plate with an involute expansion length of more than 100mm, and at present, no corresponding design, processing and detection method and product exist in China.

In the aspect of a large gear template: the Federal Germany physical technology research PTB develops a sector bull gear template with the addendum circle diameter of 1000mm in 2009, the involute length is 120mm, and the deviation of the tooth profile shape is about 1.8 mu m, which is a publicly reported gear involute template with the maximum involute length; in 2011, the PTB further designed and manufactured a master gear ring standard sample with an addendum circle diameter of about 2000mm, an involute length of about 84mm, and a tooth profile shape deviation of about 2 μm, which is a publicly reported gear involute sample with a maximum base circle diameter. The national measurement institute of China also develops a large gear template with the diameter of 1m, and the manufacturing precision is between 4-2 levels. The gear involute standard device does not meet the precision requirement of a 1-grade precision gear involute sample plate in China because the involute expansion length is slightly smaller than the base circle parameter.

A1-grade precision gear involute sample plate with the development length of 60mm and the tooth profile shape deviation of less than 0.5 mu m is developed by a high-precision gear research room of university of major graduate, and the tolerance requirement of the 1-grade precision gear involute sample plate in China is met. But the gear involute template with the larger development length is not involved.

The straight line rolls around the circle, and the motion trail of any point on the straight line is an involute taking the circle as a base circle, which is the basic generation principle of the involute. The machining of the gear involute template with high precision grade based on the pure rolling generating principle is a common consensus in the industry, but compared with the gear involute template with the common expansion length, the gear involute template with the large expansion length has the difficulties of long expansion length, large size, heavy mass and difficult driving, and the design and driving problems of a rolling component still need to be solved.

Disclosure of Invention

In order to solve the manufacturing problem of the involute of the gear with the large-expansion-length submicron profile precision, the invention provides a friction-drive-based pure rolling generating device for an involute template of the gear with the large expansion length, which is used for generating the processing and measuring reference of the involute, based on the pure rolling generating principle.

The specific technical scheme is as follows: big extension gear involute model pure roll generating device based on friction drive includes: the device comprises a rolling assembly, a guide rail assembly and a friction driving mechanism;

wherein the rolling assembly comprises: the large-expansion-length gear involute template comprises a template involute template, a template dense-bead shaft sleeve, a mandrel, a left base disc, a right base disc, a left parallel sleeve, a right parallel sleeve, a left dense-bead shaft sleeve, a right dense-bead shaft sleeve, a left flat washer, a right flat washer, a left cross washer, a right cross washer, a left locking nut and a right locking nut; the mandrel is a radial installation reference of the whole rolling assembly, the middle of the mandrel is a high-precision cylindrical surface, and the two ends of the mandrel are fine threads; the left base disc and the right base disc are respectively positioned and assembled with the mandrel through a left dense bead shaft sleeve and a right dense bead shaft sleeve and are positioned at two ends of the mandrel; the large-expansion-length gear involute sample plate is positioned and assembled with the mandrel through the sample plate dense-bead shaft sleeve and is positioned in the middle of the mandrel; the left parallel sleeve, the right parallel sleeve and the mandrel are in clearance fit; the positioning surfaces at one ends of the left and right parallel sleeves are respectively attached and positioned with the end surface of the involute template of the gear with large expansion length, and the positioning surfaces at the other ends are respectively attached and positioned with the small axial positioning end surfaces of the left and right base disks, so that the axial positioning precision of the left and right base disks and the involute template workpiece of the gear with large expansion length is ensured; the left end and the right end of the mandrel are sequentially locked with the outer end face of the left base disc through a left locking nut, a left cross-shaped washer and a left flat washer from outside to inside, and the outer end face of the right base disc is locked through a right locking nut, a right cross-shaped washer and a right flat washer;

the guide rail assembly includes: the base, the left guide rail, the right guide rail, the left baffle, the right baffle, the left guide rail positioning plate, the right guide rail positioning plate and the base disc positioning baffle; the base is of a U-shaped structure, and the top surface of the protruding structure of the base is a guide rail positioning surface; the left guide rail and the right guide rail are stretching bodies with thin waist-shaped sections, and the sections are vertically symmetrical and bilaterally symmetrical; the left guide rail and the right guide rail are respectively fixed on the guide rail positioning surface of the base through the left baffle plate, the right baffle plate, the left guide rail positioning plate and the right guide rail positioning plate; the base disc positioning baffle is fixed on the platform and used for positioning the end faces of the base and the left and right guide rails; the top surface of the guide rail is a working surface, and the rolling assembly performs pure rolling generating motion on the top surface of the guide rail;

the friction driving mechanism comprises a friction block, an electric linear sliding table, an adapter plate, an upright column sliding table and an upright column base; the friction block is composed of a rigid friction block base body and a flexible friction pad with a large friction coefficient, the friction block is arranged on the electric linear sliding table, and the friction pad is elastically pressed with the outer cylindrical surfaces of the left base disc and the right base disc respectively; the electric linear sliding table is installed on the stand column sliding table through the adapter plate, the stand column sliding table is installed on the stand column base, the stand column base is installed on the platform, the electric linear sliding table drives the friction block to move, and then the friction block drives the rolling assembly to do pure rolling generating movement on the guide rail assembly.

Furthermore, the cross sections of the left guide rail and the right guide rail are in a wide rectangle shape, an inverted trapezoid shape, a narrow rectangle shape, a trapezoid shape and a wide rectangle shape from top to bottom in sequence; the included angle between the lateral inclined plane of the guide rail and the bottom surface or the top surface of the guide rail is 60-80 degrees; the middle rectangular area in the lateral direction of the guide rail is provided with guide rail connecting holes which are uniformly distributed, and the left guide rail and the right guide rail are connected together by utilizing the guide rail connecting holes to be synchronously processed and detected. When the left guide rail and the right guide rail are used, the relative direction of the left guide rail and the right guide rail cannot be changed; and connecting threaded holes are formed in two end faces of the guide rail, so that other accessory parts can be conveniently connected.

Further, the guide rail assembly also comprises a copper gasket, a connecting screw and a guide rail fastening screw; a row of through holes and a row of threaded holes are respectively formed in the left baffle plate, the right baffle plate, the left guide rail positioning plate and the right guide rail positioning plate and are respectively used for connecting a connecting screw and a guide rail fastening screw; the guide rail set screw applies acting force to the lateral inclined plane of the guide rail through the copper gasket, the horizontal component force enables the left guide rail and the right guide rail to tightly press the guide rail positioning plate, and the vertical downward component force enables the left guide rail and the right guide rail to tightly press the base, so that the reliability of guide rail positioning is ensured.

Furthermore, the left base disc and the right base disc are of a non-full-circle integrated structure and have consistent sizes, so that the left base disc and the right base disc are convenient to reduce weight and process; a plurality of uniformly distributed web plate holes are formed in the middle web plate of the left base disc and the right base disc, so that the weight is reduced and the taking is facilitated; the left base circular disc and the right base circular disc are provided with two sections of concentric equal-diameter outer cylindrical surfaces and a reference inner hole which are symmetrically arranged, the outer cylindrical surface at one end is a generated reference cylindrical surface, and the outer cylindrical surface at the other end is a friction driving cylindrical surface; the central angle corresponding to the outer cylindrical surface is 10% larger than the design expansion angle corresponding to the gear involute sample plate with large expansion length; the lateral reference surface is parallel to the central axis of the reference inner hole; when assembled into a rolling assembly, the lateral reference surfaces of the left and right base disks are coplanar.

Furthermore, the involute sample plate of the gear with the large expansion length has an equal common normal structure, and the left and right different-side involute tooth surfaces at each end of the involute sample plate of the gear with the large expansion length are of the equal common normal structure; the reference inner hole is used for radial positioning of the involute template of the large-expansion-length gear; the two reference end surfaces are parallel and vertical to the central axis of the reference inner hole; the outer cylindrical surface of the reference is an installation reference of the involute template of the large-expansion-length gear in the quantity value transmission process and is coaxial with the inner hole of the reference; the web plate is provided with a plurality of symmetrical weight-reducing grooves, so that the weight reduction of the involute template of the gear with large expansion length is facilitated.

Further, when the rolling assembly is assembled, a left dense ball shaft sleeve, a left base disc, a left flat washer, a left cross washer and a left locking nut are sequentially arranged at one end of a mandrel, the left base disc is placed on a reference plane, a lateral reference plane is contacted with the reference plane, and a left parallel sleeve, a sample dense ball shaft sleeve, a large-expansion-length gear involute sample plate, a right parallel sleeve, a right dense ball shaft sleeve, a right base disc, a right flat washer, a right cross washer and a right locking nut are sequentially arranged; and adjusting the position of the involute template of the gear with the large expansion length to enable the central axis of the involute template to be aligned with the central axes of the left and right large base discs, and synchronously screwing the left and right locking nuts.

Furthermore, the left and right dense-bead shaft sleeves and the sample dense-bead shaft sleeve adopt G3 or G5-grade bearing steel balls, and unilateral interference magnitude between the bearing steel balls and the reference inner holes of the mandrel, the left and right base disks and the reference inner hole of the large-expansion-length gear involute sample plate is 1-3 mu m.

Furthermore, the base is U-shaped, and nuts are embedded on two side surfaces of the base and are used for connecting the left baffle plate, the right baffle plate, the left guide rail positioning plate and the right guide rail positioning plate; the upper surface of the base is an installation reference surface of the left guide rail and the right guide rail; the base is fixed on the platform through gluing or screw connection; and nuts are embedded in the platform and used for installing the base and the base disc positioning baffle.

Furthermore, the base disc positioning baffle is an L-shaped stretching body, a baffle groove is formed in the middle in the stretching direction, the side surface is a base disc positioning surface, and when the rolling assembly is installed on the guide rail assembly, the lateral reference surfaces of the left base disc and the right base disc are parallel to the base disc positioning surface; the bottom surface of the base disc positioning baffle is an installation reference surface of the base disc positioning baffle, and 1-3 rows of baffles are connected with the counter bores on the bottom surface.

Further, the whole guide rail assembly is subjected to aging treatment after assembly so as to eliminate residual stress and assembly stress of the assembly, and then the top surface of the guide rail is subjected to lapping treatment.

The invention has the beneficial effects that the invention discloses a friction-drive-based pure rolling generating device for the involute template of the large-span length gear, which comprises a rolling component, a guide rail component and a friction drive mechanism, wherein the rolling component, the guide rail component and the friction drive mechanism are used for generating the processing and measuring reference of an involute; the novel structure of the large base disc is beneficial to the processing, measurement and use of the large base disc; the rolling assemblies are symmetrical in structure, the radial reference is uniform, and two end faces of the involute template of the gear with the large expansion length are taken as axial installation references; the ratio of the movement distance of the electric linear sliding table to the unfolding length of the rolling assembly is 2:1, and the friction pad is flexible, so that the influence of non-axial errors, vibration and other environmental errors of the electric linear sliding table on the rolling unfolding precision can be reduced; the involute is processed and measured without principle error, can be used in the field of processing and measuring 1-level precision large-expansion-length gear involute sample plates, and has good market application prospect and popularization value.

Drawings

FIG. 1 is a schematic diagram of a model of a large-spread-length gear involute template rolling assembly and a friction drive mechanism.

FIG. 2 is a sectional view of a large extended length gear involute template rolling assembly and a friction drive mechanism.

Fig. 3 marble base.

Fig. 4 guide rails.

Fig. 5 a large base disc.

Figure 6 large development length gear involute profiles.

FIG. 7 shows a base disk positioning baffle.

FIG. 8 shows a friction block.

In the figure: 1, a platform; 2, a base; 3, a left baffle plate; 4, a left guide rail; 4-1 connecting the threaded hole; 4-2, a guide rail lateral positioning surface; 4-3 guide rail connecting holes; 4-4 bottom surface of guide rail; 4-5 guide rail lateral inclined planes; 4-6 guide rail top surface; 5 guide rail fastening screws; 6 connecting screws; 7, a copper gasket; 8, a left guide rail positioning plate; 9 left base disc; 9-1 outer cylindrical surface; 9-2 reference inner holes; 9-3 web holes; 9-4 axially positioning the small end face; 9-5, measuring the large ring surface axially; 9-6 lateral reference planes; 10 left lock nut; 11 a left cross washer; 12 a left plain washer; 13 a left dense ball shaft sleeve; 14 left parallel sleeves; 15 large-expansion-length gear involute sample plate; 15-1 involute flanks; 15-2 weight reduction grooves; 15-3 reference outer cylindrical surface; 15-4 reference end face; 15-5 reference inner holes; 16 sample plate dense ball shaft sleeves; 17 a mandrel; 18 right parallel sleeves; 19 a right dense ball sleeve; 20 right flat washer; 21 a right cross washer; 22 right locking nut; 23 right base disk; 24 right guide rail positioning plate; 25 right guide rail; 26 a right baffle plate; 27 base disc positioning baffle plates; 27-1, a base disc positioning surface; 27-2 baffle grooves; 27-3 baffle plates are connected with the counter bores; 28 a friction block; 28-1 friction block base; 28-2 friction pad; 29 electric linear sliding table; 30 an adapter plate; 31 column slipways; 32 column base.

Detailed Description

The specific implementation mode of the invention is illustrated by taking a large base disc with a base circle radius of 200mm, a large-expansion-length gear involute template with a base circle radius of 200mm and an expansion length of 141.5mm and a guide rail with a length of 300mm as examples:

the rolling assembly includes: the involute gear core comprises a large-expansion-length gear involute template 15, a template dense-bead shaft sleeve 16, a mandrel 17, left and right large base circular discs 9 and 23, left and right parallel sleeves 14 and 18, left and right dense-bead shaft sleeves 13 and 19, left and right flat washers 12 and 20, left and right cross washers 11 and 21, and left and right locking nuts 10 and 22.

The mandrel 17 is a radial installation reference of the whole rolling assembly, the middle of the mandrel is a high-precision cylindrical surface, and the two ends of the mandrel are fine threads.

In order to reduce the weight of the left and right base disks 9, 23 and increase the friction force between the left and right base disks and the left and right guide rails 4, 25, the left and right base disks 9, 23 are formed by high-temperature sintering of nanometer silicon carbide micropowder, the left and right large base disks 9, 23 are of non-full circle integrated structure and consistent in size, the diameter difference of the outer diameter is not more than 1 μm, and the roundness error is not more than 0.5 μm; a plurality of uniformly distributed web plate holes 9-3 are formed in the web plate between the left base circular disc 9 and the right base circular disc 23, so that weight reduction and manual grabbing are facilitated; the left base circular disc 9 and the right base circular disc 23 are provided with two sections of concentric equal-diameter outer cylindrical surfaces 9-1 and a reference inner hole 9-2 which are symmetrically arranged, the outer cylindrical surface 9-1 at one end is a developed reference cylindrical surface, the outer cylindrical surface 9-1 at the other end is a friction driving cylindrical surface, and a central angle corresponding to the outer cylindrical surface 9-1 is 10% larger than a design development angle corresponding to the gear involute template 15 with a large development length; the axial positioning small end surface 9-4 at the same end of the left base circular disc 9 and the right base circular disc 23 and the two axial measurement large ring surfaces 9-5 are coplanar, the error of the planeness is not more than 0.2 mu m, the axial positioning small end surfaces 9-4 at the two ends are parallel to the axial measurement large ring surface 9-5, and the error of the parallelism is not more than 0.3 mu m; the lateral reference surface 9-6 is parallel to the central axis of the reference inner hole 9-2, and the error of parallelism is not more than 1 μm; in use, the lateral reference surfaces 9-6 of the left and right base discs 9, 23 are coplanar.

The large-expansion-length gear involute template 15 has an equal common normal structure, left and right different-side involute tooth surfaces 15-1 at each end of the large-expansion-length gear involute template 15 are of an equal common normal structure, a reference end face 15-4 is used for axial positioning of the large-expansion-length gear involute template 15, a reference inner hole 15-5 is used for radial positioning of the large-expansion-length gear involute template 15, a reference outer cylindrical face 15-3 is an installation reference of the large-expansion-length gear involute template 15 during magnitude transmission, and a weight reduction groove 15-2 is used for reducing weight of the large-expansion-length gear involute template 15.

The left base disc 9 and the right base disc 23 are respectively positioned and assembled with the mandrel 17 through the left dense bead shaft sleeve 13 and the right dense bead shaft sleeve 19; the large-expansion-length gear involute sample plate 15 is positioned and assembled with a mandrel 17 through a sample plate dense-bead shaft sleeve 16; the left and right dense ball shaft sleeves 13 and 19 and the sample dense ball shaft sleeve 16 adopt G3 or G5-grade bearing steel balls, and the unilateral interference magnitude between the unilateral interference magnitude and the reference inner hole 9-2 of the mandrel 17 and the left and right base disks 9 and 23 or the reference inner hole 15-5 of the large-spread-length gear involute sample plate 15 is 1-3 mu m.

The left and right parallel sleeves 14 and 18 are in clearance fit with the mandrel 17, one end face of each of the left and right parallel sleeves 14 and 18 is attached and positioned with one reference end face 15-4 of the large-expansion-length gear involute template 15, the other end face is attached and positioned with the axial positioning small end face 9-4 of the left and right large base discs 9 and 23, the parallelism error of the two end faces is not more than 0.2 mu m, and the axial positioning accuracy of the left and right base discs 9 and 23 and the large-expansion-length gear involute template 15 is ensured.

When the rolling component is assembled, a left dense bead shaft sleeve 13, a left large base disc 9, a left flat washer 12, a left cross washer 11 and a left locking nut 10 are sequentially arranged at one end of a mandrel 17, then the left large base disc 9 is placed on a reference plane, a lateral reference plane 9-6 is contacted with the reference plane, and then a left parallel sleeve 14, a sample dense bead shaft sleeve 16, a large-expansion-length gear involute sample plate 15, a right parallel sleeve 18, a right dense bead shaft sleeve 19, a right large base disc 23, a right flat washer 20, a right cross washer 21 and a right locking nut 22 are sequentially arranged; and adjusting the position of the large-expansion-length gear involute template 15 to align the central axis of the large-expansion-length gear involute template 15 with the central axes of the left and right base disks 9 and 23, and synchronously screwing the left and right locking nuts 10 and 22.

The guide rail assembly includes: marble base 2, left and right guide rail 4, 25, left and right baffle 3, 26, left and right guide rail locating plate 8, 24, copper gasket 7, connecting screw 6, guide rail set screw 5 and base disc locating baffle 27.

The left and right guide rails 4 and 25 are elongated bodies with thin waist-shaped sections, the sections are vertically and bilaterally symmetrical and are sequentially wide rectangles, inverted trapezoids, narrow rectangles, trapezoids and wide rectangles from top to bottom; the included angle between the lateral inclined plane 4-2 of the guide rail and the bottom surface 4-4 or the top surface 4-6 of the guide rail is 60-80 degrees; the rectangular area in the middle of the side direction of the left and right guide rails 4, 25 is provided with a plurality of guide rail connecting holes 4-3 which are uniformly distributed, the left and right guide rails 4, 25 are connected together for synchronous processing and detection, and the relative position of the left and right guide rails 4, 25 can not be changed when the left and right guide rails 4, 25 are used; the two end faces of the left and right guide rails 4 and 25 are provided with connecting threaded holes 4-1, which is convenient for connecting other accessory parts; the left guide rail 4 and the right guide rail 25 are made of bearing steel or silicon carbide with a larger friction coefficient with silicon carbide, and the friction coefficient can reach 0.6-0.8; the bottom surface 4-4 of the guide rail is a positioning surface and is contacted with the marble base 2, the planeness error of the bottom surface 4-4 of the guide rail is less than 0.5 mu m, the top surface 4-6 of the guide rail is a working surface, the rolling component makes pure rolling expansion movement on the top surface 4-6 of the guide rail, the planeness error is less than 0.2 mu m, and the parallelism error of the top surface 4-6 of the guide rail and the bottom surface 4-4 of the guide rail is less than 1 mu m; the widths of the top surface 7-6 and the bottom surface 7-4 of the guide rail are 1-2 mm larger than those of the left base disc 9 and the right base disc 23.

A row of through holes and a row of threaded holes are formed in the left baffle plate 3, the right baffle plate 26, the left guide rail positioning plate 8 and the right guide rail positioning plate 24 respectively and are used for connecting the connecting screw 6 with the guide rail fastening screw 5; the guide rail set screw 5 applies acting force to the lateral inclined plane 4-2 of the guide rail through a copper gasket 7, the guide rail set screw 5 on the left baffle plate 3 and the right baffle plate 26 is screwed down by first equal moment according to the sequence of the first middle and the second sides, so that the left guide rail 4 and the right guide rail 25 are respectively pressed on the left guide rail positioning plate 8 and the right guide rail positioning plate 24, and then the guide rail set screw 5 on the left guide rail positioning plate 8 and the right guide rail positioning plate 24 is screwed down by equal moment according to the sequence of the first middle and the second sides; the horizontal component force causes the left and right guide rails 4, 25 to respectively press the left and right guide rail positioning plates 8, 24, and the vertical downward component force causes the left and right guide rails 4, 25 to press the marble base 2, thereby ensuring the positioning reliability of the left and right guide rails 4, 25.

The marble base 2 is U-shaped, nuts are embedded on two side surfaces of the marble base, and the left baffle 3, the right baffle 26, the left guide rail positioning plate 8 and the right guide rail positioning plate 24 are connected to the marble base 2 through the connecting screws 6; the upper surface of the marble base 2 is an installation reference surface of the left and right guide rails 4 and 25; the marble base 2 is fixed on the marble platform 1 through gluing or screwing.

The marble platform 1 is embedded with nuts for installing the marble base 2, the base disc positioning baffle 27 and the upright column base 32.

The base disc positioning baffle 27 is an L-shaped stretching body, a baffle groove 27-2 is arranged in the middle of the stretching direction, the side surface is a base disc positioning surface 27-1, the bottom surface is an installation reference surface, and 1-3 rows of baffles are arranged on the bottom surface and connected with countersunk holes 27-3;

the whole guide rail assembly is assembled and then subjected to aging treatment to eliminate residual stress and assembly stress of the assembly, and then the top surface 4-6 of the guide rail is subjected to lapping treatment.

The friction drive mechanism includes: friction block 28, electronic straight line slip table 29, keysets 30, stand slip table 31 and stand base 32.

In order to reduce the weight, the friction block base body 28-1 is made of an aviation aluminum material, the friction pad 28-2 is elastically pressed against the outer cylindrical surfaces 9-1 of the left and right base circular discs 9 and 23, the planeness error of the contact surfaces of the friction pad 28-2 and the left and right base circular discs 9 and 23 is not more than 10 mu m, and the friction pad 28-2 is made of polyurethane material or silica gel material with Shore hardness of A70-A90; the friction block 28 is installed on the electric linear sliding table 29, the electric linear sliding table 29 is installed on the upright column sliding table 31 through the adapter plate 30, the upright column sliding table 31 is installed on the upright column base 32, the upright column base 32 is installed on the marble platform 1, the electric linear sliding table 29 drives the friction block 28 to move, and then the friction block drives the rolling component to roll purely on the left and right guide rails 4 and 25; the pressing force of the friction block 28 on the left and right base circular discs 9 and 23 is adjusted by adjusting the column sliding table 31, and the pressing force is generally 5-50N.

The grinding wheel or the grinding tool is arranged on the plane of the guide rail, so that a large-span involute sample of the gear can be processed, the measuring point of the measuring head is arranged on the plane of the guide rail, and the measurement of the large-span involute sample of the gear can be realized by collecting data along the normal direction of the involute sample plate.