Grinding machine clamp for machining rotary body parts

Abstract

The utility model discloses a grinding machine clamp for machining a rotary body part. The grinding machine clamp comprises a fixing sleeve, a clamping cylinder, a mandrel, a cylindrical pin and a set screw. An inner hole of a rotary body part is formed in the mandrel, the two fixing sleeves are arranged at the two ends of the mandrel respectively, the two clamping barrels are arranged between the fixing sleeves and the rotary body part respectively, the clamping barrels are pushed to move on the mandrel through the fixing sleeves at the two ends, the fixing sleeves are connected with the mandrel through threads, and the rotary body part is arranged on the mandrel. The clamping cylinder is connected with the mandrel through a cylindrical pin, and the fixing sleeve is connected with the clamping cylinder through a set screw. The clamping cylinder is pushed to move on the mandrel through the fixing sleeves at the two ends, the diameter of the clamping cylinder is enlarged due to taper expansion, and therefore a part is fixed to the mandrel and then machined. The expanding mandrel type grinding machine clamp is high in precision and convenient to use, and an operator can use the expanding mandrel type grinding machine clamp conveniently on the premise that the machining precision of the outer circle of a rotary body part is guaranteed. The clamp adopts a combined type, is convenient to assemble and disassemble, and is beneficial to maintenance and replacement.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical processing, and in particular relates to a grinding machine fixture used for processing rotating body parts. Background Art

[0002] The part is a cylindrical component with a body of revolution. Because the inner and outer diameters and mating parts undergo relative linear motion during use, the outer diameter (φ52-0.2-0.3φ48f9) must maintain a coaxiality of φ0.012, a straightness of φ0.08, and a roughness of Ra0.4. Furthermore, the minimum wall thickness of the φ48f9 and the φ44H11 hole must be 1.8 mm. The part is made of 30CrMnSiNi2A, an alloy structural steel with a hardness of HRC47-51 and a length of L = 979 mm. Because the entire outer diameter of the part needs to be ground, a three-jaw machine is not feasible; instead, an expansion mandrel is required for clamping. Regarding equipment selection, CNC lathe machining of parts with a hardness of approximately HRC50 is costly and cannot guarantee a roughness of Ra0.4. However, longitudinal grinding, due to the reduced contact area between the grinding wheel and the workpiece, reduces pressure and heat generation, resulting in higher machining accuracy and finer surface finishes, led to the decision to perform the process on a grinding machine. Utility Model Content

[0003] The utility model aims to provide a set of high-precision and easy-to-use expanding spindle grinding machine fixtures, which can ensure the precision of the outer circle machining of rotating parts while allowing operators to use them conveniently.

[0004] The technical solution of the utility model includes a fixed sleeve, a chuck, a spindle, a cylindrical pin, and a set screw. The inner hole of the rotating part is installed on the spindle. Two fixed sleeves are provided, one at each end of the spindle. Two chucks are provided, one between the fixed sleeve and the rotating part. The chuck is pushed on the spindle by the fixed sleeves at both ends. The fixed sleeve is connected to the spindle by a thread. The chuck is connected to the spindle by a cylindrical pin. The fixed sleeve is connected to the spindle by a set screw. The fixed sleeve is rotated to move the chuck on the spindle, thereby expanding the outer diameter of the chuck and clamping the part. Through batch processing verification, the accuracy of the processed holes fully meets the design requirements. The chuck is pushed on the spindle by the fixed sleeves at both ends. The diameter of the chuck becomes larger due to the expansion of the taper, thereby fixing the part on the spindle and then performing grinding.

[0005] The mandrel consists of a support portion, a transition portion, and a connecting portion. The transition portion is tapered and transitionally connected to the connecting portion. The transition portions are located at both ends of the support portion, and the connecting portions are located at both ends of the outer side of the transition portion. The transition portion is provided with pin holes that mate with cylindrical pins. A "blank cutter" portion is provided on the mandrel support portion to prevent scratches on the part hole surface caused by straightness errors during tooling.

[0006] The inner side of the collet tapers to the transition section, and the collet's outer diameter is 0.01 to 0.027 mm smaller than the minimum dimension of the rotating component. Three straight slots are evenly staggered along the axial direction at each end of the collet. These evenly staggered slots enhance flexibility, and the taper aligns with the mandrel, ensuring uniform dimensions during expansion.

[0007] The clamping sleeves at both ends push the collet along the tapered outer diameter of the mandrel, thereby expanding the collet diameter and securing the part. The fixture is positioned by the hole, and the mandrel size is as close to the actual size of the part as possible. This ensures that the wall thickness of the machined part is uniform and the minimum wall thickness is guaranteed.

[0008] The cylindrical pin and set screw fix the position of the collet on the mandrel, and the height must be lower than the diameter of the collet to avoid scratching the inner hole of the part when loading and unloading the tooling.

[0009] The two ends of the spindle are provided with a center hole, which is coaxially arranged. This is the positioning reference for using this grinder fixture, so the center hole needs to be ground before finishing.

[0010] The chuck is used to expand and fix parts, and the material needs to be wear-resistant, so the alloy tool steel CrWMn is selected, and the heat treatment hardness is HRC52-57.

[0011] The beneficial effects of this utility model are as follows: the high-precision and easy-to-use expanding mandrel grinding machine fixture can ensure the precision of the external cylindrical machining of rotating parts while being easy for the operator to use. The fixture adopts a modular design, which is easy to assemble and disassemble, and is convenient for maintenance and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are incorporated into and constitute a part of the specification, illustrating embodiments of the present invention and, together with the specification, explaining the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can derive other drawings based on these drawings without inventive effort. In the drawings:

[0013] Figure 1 This is a schematic diagram of the structure of a grinding machine fixture for machining rotating parts provided by the present invention;

[0014] Figure 2 A schematic diagram of the spindle structure provided by the utility model;

[0015] Figure 3 for Figure 2 Cross-section in the middle II direction;

[0016] Figure 4 A schematic diagram of the structure of the fixing sleeve provided by the utility model;

[0017] Figure 5 A schematic diagram of the clamping structure provided by the utility model;

[0018] Figure 6 for Figure 5 Sectional view along II-II direction;

[0019] Figure 7 A schematic diagram of the cylindrical pin structure provided by the utility model;

[0020] Figure 8 A schematic diagram of the set screw structure provided by the utility model;

[0021] In the attached figure:

[0022] 1-fixed sleeve, 11-ring groove,

[0023] 2-clamp, 21-groove 1, 22-straight groove, 23-pin hole 2, 24-threaded hole,

[0024] 3- spindle, 31- support part, 32- transition part, 33- connection part, 34- center hole, 311- empty knife part, 321- pin hole 1,

[0025] 4-Cylindrical pin, 5-Set screw, 6-Rotary part. DETAILED DESCRIPTION

[0026] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art.

[0027] See also Figure 1-8The figure shows a schematic diagram of the grinding machine fixture structure for machining rotating parts provided by the present invention, including a fixing sleeve 1, a chuck 2, a spindle 3, a cylindrical pin 4, and a set screw 5; the inner hole of the rotating part 6 is installed on the spindle 3, and the fixing sleeve 1 is provided with two, respectively, which are respectively provided at both ends of the spindle 3, and the chuck 2 is provided with two, respectively provided between the fixing sleeve 1 and the rotating part 6, through the fixing sleeves 1 at both ends to push the chuck 2 to move on the spindle 3, the fixing sleeve 1 and the spindle 3 are connected by threaded connection, the chuck 2 and the spindle 3 are connected by a cylindrical pin 4, and the fixing sleeve 1 and the chuck 2 are connected by a set screw 5; the spindle 3 is composed of a supporting part 31, a transition part 32 and a connecting part 33, the transition part 32 is a conical structure, and is transitionally connected with the connecting part 33, the transition part 32 is provided at both ends of the supporting part 31, the connecting part 33 is provided at both ends of the outer side of the transition part 32, and the transition part 32 is provided with a pin hole 321 to cooperate with the cylindrical pin 4. The support portion 31 is provided with an empty cut portion 311. Since the part hole is generally processed according to the mean difference, the positioning size of the spindle is as close to the part size as possible. However, in order to avoid scratches on the surface of the part hole due to the straightness error of the part hole, the spindle needs to evenly process some "empty cuts" in the positioning part to avoid the part.

[0028] One inner end of the chuck 2 tapers with the transition portion 32. The outer diameter of the chuck 2 is 0.01 to 0.027 mm smaller than the minimum dimension of the rotating component 6. The other end is provided with a groove 21 that mates with the fixed sleeve 1. Three straight grooves 22 are evenly staggered at each end of the chuck 2 to increase elasticity. The taper is consistent with the core shaft, ensuring uniform dimensions during expansion. A pin hole 23 is also radially provided at one end of the chuck 2 near the groove 21. The pin hole 23 mates with a cylindrical pin 4. Threaded holes 24 are symmetrically provided on the outer side of the groove 21 to mate with a set screw 5. A center hole 34 is provided at each end of the core shaft 3, and the center holes 34 are coaxially arranged. The height of the cylindrical pin 4 and set screw 5 after installation must not exceed the outer diameter of the chuck 2 to avoid scratching the inner bore of the component during assembly and disassembly. The chuck 2 is made of CrWMn alloy tool steel with a heat treatment hardness of HRC52 to 57. The chuck needs to be wear-resistant, so CrWMn steel is used. Straight grooves are machined evenly on each end, increasing its flexibility. The taper is consistent with the mandrel, ensuring uniform dimensions during expansion. A radial annular groove 11 is provided on one end of the retaining sleeve 1, which is secured with a set screw 5. The other end features a polygonal structure for easy installation and removal.

[0029] During use, the X-axis position of the retaining sleeve 1 is adjusted as the size expands. Under the action of the cylindrical pin 4, the collet 2 moves along the X-axis direction of the groove. After the size is adjusted, it is fixed in the annular groove 11 of the retaining sleeve 1 with the set screw 5. During use, the height of the cylindrical pin 4 and the set screw 5 must not exceed the outer diameter of the collet to avoid affecting the loading and unloading of parts. The retaining sleeves 1 at both ends push the collet 2 on the mandrel 3. The diameter of the collet 2 increases due to the tapered expansion, thus fixing the part on the mandrel, and then grinding.

[0030] The above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit the scope of the present invention. Any modification or equivalent substitution of the technical solution of the present invention made by ordinary technicians in this field shall be included in the scope of the claims of the present invention as long as it does not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A grinding machine fixture for machining rotating parts, characterized by: The invention comprises a fixed sleeve (1), a chuck (2), a spindle (3), a cylindrical pin (4), and a set screw (5); the inner hole of the rotating body part (6) is installed on the spindle (3); two fixed sleeves (1) are provided, which are respectively provided at both ends of the spindle (3); two chucks (2) are provided, which are respectively provided between the fixed sleeve (1) and the rotating body part (6); the chuck (2) is pushed to move on the spindle (3) by the fixed sleeves (1) at both ends; the fixed sleeve (1) and the spindle (3) are connected by threads; the chuck (2) and the spindle are connected by threads. (3) is connected by a cylindrical pin (4), and the fixing sleeve (1) and the clamping sleeve (2) are connected by a set screw (5); the central shaft (3) is composed of a supporting portion (31), a transition portion (32) and a connecting portion (33), the transition portion (32) is a conical structure, and is transitionally connected to the connecting portion (33), the transition portion (32) is arranged at both ends of the supporting portion (31), and the connecting portion (33) is arranged at both ends of the outer side of the transition portion (32), and the transition portion (32) is provided with a pin hole (321) to cooperate with the cylindrical pin (4).

2. The grinding machine fixture for machining rotating parts according to claim 1, characterized in that: The support portion (31) is provided with a blank blade portion (311).

3. The grinding machine fixture for machining rotating parts according to claim 1, characterized in that: One end of the inner side of the chuck (2) is taperedly matched with the transition part (32), the outer diameter of the chuck (2) is 0.01 to 0.027 mm smaller than the minimum size of the rotating body part (6), and the other end is provided with a groove (21) to match with the fixed sleeve (1); three straight grooves (22) are evenly staggered along the axial direction at both ends of the chuck (2), and a pin hole (23) is also provided radially at one end of the chuck (2) close to the groove (21), and the pin hole (23) is matched with the cylindrical pin (4), and threaded holes (24) are symmetrically provided on the outer side of the groove (21) to match with the set screw (5).

4. The grinding machine fixture for machining rotating parts according to claim 1, characterized in that: Central holes (34) are provided at both ends of the spindle (3), and the central holes (34) are coaxially arranged.

5. The grinding machine fixture for machining rotating parts according to claim 1, characterized in that: The height of the cylindrical pin (4) and the set screw (5) after installation shall not exceed the outer diameter of the clamping barrel (2).

6. The grinding machine fixture for machining rotating parts according to claim 1, characterized in that: The chuck (2) is made of alloy tool steel CrWMn, with a heat treatment hardness of HRC52-57.

7. The grinding machine fixture for machining rotating parts according to claim 1, characterized in that: One end of the fixing sleeve (1) is provided with a radial annular groove (11) for cooperating with the set screw (5), and the other end is provided with a polygonal structure.

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