High-precision synchronous ring conical surface grinding fixture

Abstract

The invention provides a high-precision synchronous ring conical surface grinding fixture which is characterized in that an inner cone grinding sleeve connecting disc is connected with an inner cone grinding sleeve bolt, a conical grinding surface at the lower part of an inner cone grinding sleeve is connected with a conical surface of a synchronous ring, and a protective plate is mounted above an inner cone grinding positioning mandrel; the interior of the plane needle bearing penetrates through the air cylinder to be arranged between the inner cone grinding and positioning mandrel and the grinding and positioning mandrel outer sleeve, the grinding and positioning mandrel outer sleeve and the grinding and positioning mandrel outer sleeve base are installed under the machine tool spindle after being assembled, and an inner hole of the grinding and positioning mandrel outer sleeve and the machine tool spindle are concentric and locked; the locking pull rod adjusts the strength of the pressing plate for pressing the synchronous ring, the synchronous ring is fixed between the pressing plate and the inner cone grinding and positioning mandrel, and molybdenum spraying treatment is conducted on the outer conical surface of the synchronous ring. According to the high-precision synchronous ring conical surface grinding fixture, an end face pressing and positioning tool is provided, the center of a workpiece is centered in a floating mode, and the machining influence caused by clearance fit and non-concentricity of the center of a machine tool spindle and the center of the tool is effectively avoided.

Description

Technical Field

[0001] The invention belongs to the field of molybdenum-sprayed cone ring grinding discs, and in particular relates to a high-precision synchronous ring cone surface grinding fixture. Background Art

[0002] In the synchronizer steel ring products, some workpieces need to be molybdenum-sprayed on the inner and outer cone synchronizer ring surfaces to improve friction. In order to effectively ensure the dimensional accuracy, the workpieces after molybdenum spraying need to be ground accordingly, such as the synchronizer ring needs to grind the outer cone surface.

[0003] At present, there are few dedicated grinding machines on the market. Most of them are improved and processed by vertical drilling machines, but the precision control is not good. Because the workpiece structure of the synchronous cone ring is relatively thin, it is easy to deform into an ideal roundness when tightened and fixed by the tensioning fixture, but it will rebound after unloading and recovery, which will eventually affect the overall shape and position tolerance and reduce the precision. Summary of the invention

[0004] In view of this, the present invention aims to propose a high-precision synchronous ring conical surface grinding fixture to solve the problem that the vertical drilling machine has poor precision control in improving the precision of machining. The workpiece structure of the synchronous cone ring is relatively thin and is easily deformed into an ideal roundness when tightened and fixed by a tensioning fixture. However, it will rebound after unloading and recovery, which will eventually affect the overall shape and position tolerance and deteriorate the precision.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows: The invention provides a high-precision synchronous ring conical surface grinding fixture, comprising an inner cone grinding sleeve, an inner cone grinding sleeve connecting plate, an inner cone grinding positioning mandrel, a grinding positioning mandrel sleeve, a grinding positioning mandrel sleeve base, a locking pull rod, a pressure plate, a guard plate, a cylinder, and a plane needle roller bearing; the inner cone grinding sleeve connecting plate is connected to the inner cone grinding sleeve bolt, the conical grinding surface of the lower part of the inner cone grinding sleeve is connected to the outer cone surface of the synchronous ring, the guard plate is installed above the inner cone grinding positioning mandrel, the inside of the plane needle roller bearing passes through the cylinder and is arranged between the inner cone grinding positioning mandrel and the grinding positioning mandrel sleeve, the grinding positioning mandrel sleeve and the grinding positioning mandrel sleeve base are assembled and installed directly below the main shaft of a machine tool, the inner hole of the grinding positioning mandrel sleeve is concentric with the main shaft of the machine tool and locked, the locking pull rod adjusts the force of the pressure plate to press the synchronous ring, and fixes the synchronous ring between the pressure plate and the inner cone grinding positioning mandrel, the inner diameter of the synchronous ring is fixed to the circular protrusion of the inner cone grinding positioning mandrel, and the outer cone surface of the synchronous ring is sprayed with molybdenum.

[0006] Furthermore, the grinding and positioning mandrel outer sleeve is provided with positioning mandrel limit holes and bearing mounting recesses from top to bottom, a cylinder air pipe passing hole is provided on the side, four square grooves are provided on the grinding and positioning mandrel outer sleeve for installing blocks, and two cylinder air pipe passing holes are provided in the middle of the grinding and positioning mandrel outer sleeve to allow the cylinder air pipe to pass through.

[0007] Furthermore, a plurality of reserved holes are arranged on the connecting plate of the inner cone grinding sleeve, and the surface of the conical grinding surface at the lower part of the inner cone grinding sleeve is plated with diamond sand.

[0008] Furthermore, when the grinding positioning mandrel sleeve is installed, the concentricity of the grinding sleeve main shaft and the grinding sleeve main shaft is ensured to be within 0.03 mm.

[0009] Furthermore, a gap of 0.20 mm is reserved between the maximum outer diameter of the inner cone grinding and positioning mandrel and the maximum inner diameter of the grinding and positioning mandrel outer sleeve.

[0010] Furthermore, the fitting tolerance between the inner cone grinding positioning mandrel and the grinding positioning mandrel outer sleeve is set at 0.2 mm.

[0011] Furthermore, the height of the plane needle roller bearing is higher than the height of the bearing mounting recess.

[0012] Furthermore, four square grooves are correspondingly provided at the joints between the inner cone grinding and positioning mandrel and the grinding and positioning mandrel outer sleeve for installing the stopper.

[0013] Compared with the prior art, the high-precision synchronizer ring conical surface grinding fixture described in the present invention has the following advantages: the high-precision synchronizer ring conical surface grinding fixture described in the present invention provides an end face clamping and positioning tooling, and the center of the workpiece is floating centered, which effectively avoids the processing influence caused by clearance fit and the eccentricity between the machine tool spindle and the tooling center, and greatly improves the processing accuracy of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0015] In the attached picture: Figure 1 It is an overall cross-sectional schematic diagram of the high-precision synchronizer ring conical surface grinding fixture according to an embodiment of the present invention; Figure 2 It is a schematic diagram of the connection between the inner cone grinding sleeve and the inner cone grinding sleeve connecting plate in the high-precision synchronous ring conical surface grinding fixture according to an embodiment of the present invention; Figure 3 It is a schematic diagram of the axial side of the grinding and positioning mandrel outer sleeve in the high-precision synchronous ring conical surface grinding fixture according to the embodiment of the present invention; Figure 4 It is a top view schematic diagram of a grinding and positioning mandrel outer sleeve in a high-precision synchronous ring conical surface grinding fixture according to an embodiment of the present invention; Figure 5 It is a schematic diagram of CC in a top view of a grinding and positioning mandrel outer sleeve in a high-precision synchronous ring conical surface grinding fixture according to an embodiment of the present invention; Figure 6 It is a schematic diagram of the inner cone grinding and positioning mandrel in the high-precision synchronizer ring conical surface grinding fixture according to an embodiment of the present invention; Figure 7 It is a schematic diagram of the axial side of a synchronizer ring ground in a high-precision synchronizer ring conical surface grinding fixture according to an embodiment of the present invention; Figure 8 It is a schematic diagram of force analysis when the main axis of the grinding sleeve in the high-precision synchronous ring conical surface grinding fixture according to an embodiment of the present invention moves downward.

[0016] Description of reference numerals: 1. Inner cone grinding sleeve; 2. Inner cone grinding sleeve connecting plate; 3. Inner cone grinding positioning mandrel; 4. Grinding positioning mandrel outer sleeve; 5. Grinding positioning mandrel outer sleeve base; 6. Locking rod; 7. Pressure plate; 8. Guard plate; 9. Cylinder; 10. Plane needle roller bearing; 11. Synchronous ring; 101. Conical grinding surface; 201. Reserved hole; 401. Positioning mandrel limit hole; 402. Bearing mounting recess; 403. Cylinder air pipe through hole. DETAILED DESCRIPTION

[0017] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying 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 limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0020] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0021] See also Figure 1-Figure 8 As shown, this embodiment provides a high-precision synchronous ring conical surface grinding fixture, including an inner cone grinding sleeve 1, an inner cone grinding sleeve connecting plate 2, an inner cone grinding positioning mandrel 3, a grinding positioning mandrel outer sleeve 4, a grinding positioning mandrel outer sleeve base 5, a locking rod 6, a pressure plate 7, a guard plate 8, a cylinder 9, and a plane needle roller bearing 10; the inner cone grinding sleeve connecting plate 2 is connected to the inner cone grinding sleeve 1 with bolts, the conical grinding surface 101 at the lower part of the inner cone grinding sleeve 1 is connected to the outer cone surface of the synchronous ring 11, the guard plate 8 is installed above the inner cone grinding positioning mandrel 3, and the plane needle roller bearing The cylinder 9 passing through the inside of the bearing 10 is arranged between the inner cone grinding and positioning mandrel 3 and the grinding and positioning mandrel sleeve 4. The grinding and positioning mandrel sleeve 4 and the grinding and positioning mandrel sleeve base 5 are assembled and installed directly below the machine tool spindle. The inner hole of the grinding and positioning mandrel sleeve 4 is concentric with the machine tool spindle and locked. The locking pull rod 6 adjusts the force of the pressure plate 7 to press the synchronizer ring 11, and the synchronizer ring 11 is fixed between the pressure plate 7 and the inner cone grinding and positioning mandrel 3. The inner diameter of the synchronizer ring 11 is fixed to the circular protrusion of the inner cone grinding and positioning mandrel 3, and the outer cone surface of the synchronizer ring 11 is sprayed with molybdenum.

[0022] The plane needle roller bearing has the function of large end surface load and radial micro-movement. The height of the bearing should be slightly higher than the height of the bearing mounting concave platform. The guard plate 8 can prevent the grinding fluid and the falling grinding sand from entering the inner cone grinding positioning mandrel jacket to damage the plane bearing and affect the accuracy. The cylinder is a tie rod cylinder with a certain adjustment distance range, so that the range of tightening or loosening the workpiece can be adjusted, which is convenient for on-site operation.

[0023] Specifically, in this embodiment, the grinding and positioning mandrel sleeve 4 is provided with a positioning mandrel limit hole 401 and a bearing mounting recess 402 from top to bottom, a cylinder air pipe through hole 403 is provided on the side, and four square grooves are provided on the grinding and positioning mandrel sleeve 4 for installing a block, and two cylinder air pipe through holes 403 are provided in the middle of the grinding and positioning mandrel sleeve 4 to allow the air pipe of the cylinder 9 to pass through.

[0024] When the inner cone grinding and positioning mandrel 3 is placed in the grinding and positioning mandrel sleeve, only the positioning block is installed in the square groove of the grinding and positioning mandrel sleeve to limit the rotation of the inner cone grinding and positioning mandrel 3, but it can move in the X and Y directions within the plane.

[0025] Specifically, in this embodiment, a plurality of reserved holes 201 are provided on the inner cone grinding sleeve connecting plate 2, and the surface of the conical grinding surface 101 at the lower part of the inner cone grinding sleeve 1 is coated with diamond sand.

[0026] The inner cone grinding sleeve connecting plate is used to receive the grinding fluid flowing into the plate during grinding work. The grinding fluid will flow along the reserved holes on the top of the grinding sleeve to the inner wall of the grinding sleeve to play a role in lubrication and cooling.

[0027] Specifically, in this embodiment, when the grinding and positioning mandrel sleeve 4 is installed, it is ensured that the concentricity of the grinding sleeve main shaft therewith is within 0.03 mm.

[0028] Specifically, in this embodiment, a gap of 0.20 mm is reserved between the maximum outer diameter of the inner cone grinding and positioning mandrel 3 and the maximum inner diameter of the grinding and positioning mandrel sleeve 4 .

[0029] Specifically, in this embodiment, the fitting tolerance between the inner cone grinding and positioning mandrel 3 and the grinding and positioning mandrel outer sleeve 4 is set at 0.2 mm.

[0030] In this design, because the roundness tolerance of the workpiece and the concentricity error between the center hole of the grinding positioning mandrel sleeve and the grinding sleeve spindle can be controlled within 0.05, the fitting tolerance between the inner cone grinding positioning mandrel and the grinding positioning mandrel sleeve is set at 0.2, which is sufficient for adjustment.

[0031] A gap of 0.20mm is reserved between the maximum outer diameter of the inner cone grinding and positioning mandrel and the maximum inner diameter of the grinding and positioning mandrel jacket, so that the inner cone grinding and positioning mandrel can move freely within a radial range of 0.20mm. (When installing the inner cone grinding and positioning mandrel jacket, ensure that the concentricity of the grinding sleeve spindle and it is controlled within 0.03mm, which can greatly reduce the difficulty of installation). Figure 8 It demonstrates that during the workpiece processing, the grinding sleeve rotates and moves downward as a whole to increase the radial size of the outer cone surface of the synchronous inner cone steel ring. During this process, the pressure F1 between the inner surface of the inner cone grinding sleeve and the outer cone surface of the synchronous inner cone steel ring. This F1 can be decomposed into a pressure F3 perpendicular to the end face of the mandrel and a radial component force of the center of the synchronous inner cone steel ring. The effect of the pressure F3 perpendicular to the end face of the mandrel makes the synchronous inner cone steel ring further press the end face of the grinding inner cone grinding positioning mandrel, and the resultant force F2 pointing to the center of the synchronous inner cone steel ring is no longer zero, which has the effect of moving the steel ring toward the center of the grinding sleeve spindle. When the grinding sleeve just contacts the synchronous inner cone steel ring, the center of the synchronous inner cone steel ring is likely to deviate from the center of the spindle of the grinding sleeve. The more deviated from the center, the first part will contact the inner surface of the grinding sleeve for grinding. During the downward movement of the spindle of the grinding sleeve, the deviated part has a greater tendency to move toward the center of the spindle. As the grinding progresses, the outer circle of the synchronous inner cone steel ring will gradually approach the ideal roundness, and its center will be infinitely close to the center of the spindle, and the component force F2 will also be close to 0.

[0032] Specifically, in this embodiment, the height of the plane needle roller bearing 10 is higher than the height of the bearing mounting recess 402 .

[0033] Specifically, in this embodiment, four square grooves are correspondingly provided at the junction of the inner cone grinding and positioning mandrel 3 and the grinding and positioning mandrel outer sleeve 4 for installing the stopper.

[0034] The precision synchronous ring conical grinding fixture provides an end face clamping and positioning tooling. At the same time, the center of the workpiece is floating centered, which effectively avoids the processing influence caused by clearance fit and the eccentricity between the machine tool spindle and the tooling center, greatly improving the processing accuracy of the workpiece.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-precision synchronous ring conical surface grinding fixture, characterized in that: include, An inner cone grinding sleeve (1), an inner cone grinding sleeve connecting plate (2), an inner cone grinding positioning mandrel (3), a grinding positioning mandrel outer sleeve (4), a grinding positioning mandrel outer sleeve base (5), a locking pull rod (6), a pressure plate (7), a guard plate (8), a cylinder (9), and a plane needle roller bearing (10); the inner cone grinding sleeve connecting plate (2) is bolted to the inner cone grinding sleeve (1), a conical grinding surface (101) at the lower part of the inner cone grinding sleeve (1) is connected to an outer conical surface of a synchronizer ring (11), the guard plate (8) is installed above the inner cone grinding positioning mandrel (3), and the inside of the plane needle roller bearing (10) passes through the cylinder (9) and is provided with Between the inner cone grinding and positioning mandrel (3) and the grinding and positioning mandrel sleeve (4), the grinding and positioning mandrel sleeve (4) and the grinding and positioning mandrel sleeve base (5) are assembled and installed directly below the main shaft of the machine tool. The inner hole of the grinding and positioning mandrel sleeve (4) is concentric with the main shaft of the machine tool and locked. The locking rod (6) adjusts the force of the pressure plate (7) to press the synchronous ring (11), and the synchronous ring (11) is fixed between the pressure plate (7) and the inner cone grinding and positioning mandrel (3). The inner diameter of the synchronous ring (11) is fixed to the circular protrusion of the inner cone grinding and positioning mandrel (3), and the outer cone surface of the synchronous ring (11) is sprayed with molybdenum.

2. The high-precision synchronizer ring conical surface grinding fixture according to claim 1 is characterized in that: The grinding and positioning mandrel sleeve (4) is provided with a positioning mandrel limiting hole (401) and a bearing mounting recess (402) from top to bottom, and a cylinder air pipe passing hole (403) is provided on the side. Four square grooves are provided on the grinding and positioning mandrel sleeve (4) for installing a stopper. Two cylinder air pipe passing holes (403) are provided in the middle of the grinding and positioning mandrel sleeve (4) to allow the air pipe of the cylinder (9) to pass through.

3. The high-precision synchronizer ring conical surface grinding fixture according to claim 1 is characterized in that: A plurality of reserved holes (201) are provided on the inner cone grinding sleeve connecting plate (2), and the surface of the conical grinding surface (101) at the lower part of the inner cone grinding sleeve (1) is plated with corundum.

4. The high-precision synchronous ring conical surface grinding fixture according to claim 2 is characterized in that: When installing the grinding positioning mandrel sleeve (4), ensure that the concentricity of the grinding sleeve main shaft and the grinding sleeve main shaft is within 0.03 mm.

5. The high-precision synchronizer ring conical surface grinding fixture according to claim 1, characterized in that: A gap of 0.20 mm is reserved between the maximum outer diameter of the inner cone grinding positioning mandrel (3) and the maximum inner diameter of the grinding positioning mandrel outer sleeve (4).

6. The high-precision synchronizer ring conical surface grinding fixture according to claim 5, characterized in that: The matching tolerance between the inner cone grinding positioning mandrel (3) and the grinding positioning mandrel outer sleeve (4) is set at 0.2 mm.

7. The high-precision synchronizer ring conical surface grinding fixture according to claim 1, characterized in that: The height of the plane needle roller bearing (10) is higher than the height of the bearing mounting recess (402).

8. The high-precision synchronizer ring conical surface grinding fixture according to claim 1, characterized in that: Four square grooves are correspondingly arranged at the joints between the inner cone grinding positioning mandrel (3) and the grinding positioning mandrel outer sleeve (4) for installing a stopper.

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