Universal self-centering tool for grinding small cylindrical parts

Abstract

This invention relates to the field of self-centering grinding fixtures, and discloses a universal self-centering fixture for grinding small cylindrical parts. The fixture includes a mandrel assembly, an externally mounted locking block, an externally mounted locking cover, and a set of limit screws evenly distributed between the locking cover and the locking block. The mandrel assembly is externally threaded with locking screws. A roller guide is mounted on the left side of the mandrel assembly, and pins are mounted at both ends of the roller guide. A second spring is externally connected to the push rod. This universal self-centering fixture for grinding small cylindrical parts avoids the limitations of traditional fixtures in providing high-precision machining conditions for the roller guide. Furthermore, the added set of limit screws automatically locks the position of the limit screws when fixing the locking cover and locking block, avoiding the need for pins to lock the position of the limit screws in traditional fixtures. This reduces the fixing steps and increases the machining speed of the workpiece.

Description

Technical Field

[0001] This invention relates to the field of grinding self-centering tooling technology, specifically a universal grinding self-centering tooling for small cylindrical parts. Background Technology

[0002] In the field of marine diesel engines, the structure of driving the fuel injection pump roller guide and intake and exhaust roller guide through the camshaft is a very common structure. Because the roller guide needs to be installed with roller pins and rollers for transmission, the existing machining tooling cannot fix the device well. In addition, the outer circle of the roller guide needs to slide friction during operation, so the outer circle roughness requirement is relatively high and grinding is required.

[0003] Therefore, there is an urgent need for a universal self-centering tooling for grinding small cylindrical parts. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a universal self-centering fixture for grinding small cylindrical parts. This solves the technical problems of the roller guide cylinder requiring the installation of roller pins and rollers for transmission, which prevents existing machining fixtures from properly fixing the device. Furthermore, the outer circle of the roller guide cylinder undergoes sliding friction during operation, necessitating grinding to achieve high surface roughness.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a universal self-centering fixture for grinding small cylindrical parts, comprising: a mandrel assembly, a locking block assembled on the outside of the mandrel assembly, a locking cover assembled on the outside of the locking block, and a set of limit screws evenly distributed between the locking cover and the locking block, a locking screw threadedly connected to the outside of the mandrel assembly, a roller guide cylinder assembled on the left side of the mandrel assembly, and ejector pins assembled at both ends of the roller guide cylinder.

[0008] Preferably, the limiting screw assembly includes an assembly screw and a nut, wherein the assembly screw is threaded to the outside of the nut, and the nut is embedded in the outside of the locking cover, and the nut can fix and limit the assembly screw.

[0009] Preferably, push rods are slidably connected to both ends of the assembly screw, and square arms are slidably connected to both sides of the assembly screw. The square arms can abut against the two retaining arms to return to their original position, and at the same time, the square arms can drive the assembly screw to rotate.

[0010] Preferably, hollow columns are embedded at both ends of the nut, and a locking arm is slidably connected inside the hollow column. A first spring is connected between the inside of the locking arms. The locking arms can slide inside the hollow column, and the first spring can drive the locking arms to return to their original position after movement.

[0011] Preferably, the mounting screw has grooves at both ends, which can be used to assemble and install the third spring and the second spring respectively.

[0012] Preferably, a third spring is evenly distributed on the outside of the square arm. The third spring is connected to the slide groove and can drive the square arm to move and then return to its original position.

[0013] Preferably, the push rod is externally connected to a second spring, which is connected to a slide groove. The second spring can drive the push rod to move and then return to its original position.

[0014] (III) Beneficial Effects

[0015] Compared with the prior art, the present invention provides a universal self-centering tooling for grinding small cylindrical parts, which has the following beneficial effects:

[0016] This universal self-centering fixture for grinding small cylindrical parts uses a combination of locking screws, locking caps, locking blocks, and limit screws to lock the mandrel assembly, thus providing a feasible solution for grinding roller guide cylinders. Furthermore, this device is applicable to structures with the same features as roller guide cylinders, improving its adaptability and avoiding the limitations of traditional fixtures that cannot achieve high-precision machining of roller guide cylinders. The limit screw assembly automatically locks its position when the locking cap and locking block are fixed, eliminating the need for pins to lock the limit screw assembly, reducing fixing steps and increasing workpiece machining speed. Attached Figure Description

[0017] Figure 1 This is a front view of the present invention;

[0018] Figure 2 This is a planar sectional view of the present invention;

[0019] Figure 3 This is a front view of the limiting screw assembly of the present invention;

[0020] Figure 4 This is a front sectional view of the limiting screw assembly of the present invention;

[0021] Figure 5 This is a front sectional view of the hollow column of the present invention.

[0022] In the diagram: 1. Mandrel assembly; 2. Locking screw; 3. Locking cover; 4. Locking block; 5. Limit screw assembly; 51. Assembly screw; 52. Nut; 53. Square arm; 54. Hollow column; 55. Clamping arm; 56. First spring; 57. Push rod; 571. Second spring; 58. Third spring; 59. Slide groove; 6. Roller guide cylinder; 7. Ejector pin. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] This invention provides a technical solution; please refer to [link / reference]. Figure 1 and Figure 2 A general-purpose self-centering fixture for grinding small cylindrical parts includes: a spindle assembly 1, a locking block 4 mounted on the outside of the spindle assembly 1, the locking block 4 fixing the spindle assembly 1 under monitoring, a locking cover 3 mounted on the outside of the locking block 4, and a set of limit screws 5 evenly distributed between the locking cover 3 and the locking block 4, the set of limit screws 5 cooperating with the locking cover 3 to fix the locking block 4, a locking screw 2 threadedly connected to the outside of the spindle assembly 1, the locking screw 2 adjusting the position of the device, a roller guide cylinder 6 mounted on the left side of the spindle assembly 1, the roller guide cylinder 6 mounting the spindle assembly 1, and pins 7 mounted on both ends of the roller guide cylinder 6.

[0025] Please see Figure 3 , Figure 4 and Figure 5 The limiting screw group 5 includes an assembly screw 51 and a nut 52. The assembly screw 51 is threaded to the outside of the nut 52. The nut 52 is embedded in the outside of the locking cover 3. The nut 52 can fix and limit the assembly screw 51. Both ends of the assembly screw 51 are slidably connected to push rods 57.

[0026] The assembly screw 51 has square arms 53 slidably connected to both sides inside. The square arms 53 can abut against two retaining arms 55 to return to their original position. At the same time, the square arms 53 can drive the assembly screw 51 to rotate. The nut 52 has hollow pillars 54 embedded at both ends inside. The retaining arms 55 are slidably connected inside the hollow pillars 54.

[0027] The first spring 56 is connected inside the clamping arm 55. The clamping arm 55 can slide inside the hollow column 54, and the first spring 56 can drive the clamping arm 55 to return to its original position after movement. The mounting screw 51 has a sliding groove 59 at both ends inside. The sliding groove 59 can be used to assemble and install the third spring 58 and the second spring 571 respectively.

[0028] The square arm 53 is evenly provided with third springs 58. The third springs 58 are connected to the slide groove 59. The third springs 58 can drive the square arm 53 to move and then return to its original position. The push rod 57 is connected to the outside with a second spring 571. The second spring 571 is connected to the slide groove 59. The second spring 571 can drive the push rod 57 to move and then return to its original position.

[0029] This solution first assembles a locking block 4 on the outside of the spindle assembly 1, then uses a locking cover 3 to fix the locking block 4 so that it will not detach from the spindle assembly 1. The locking block 4 is then fixed by a limit screw assembly 5. A locking screw 2 is then assembled on the outside of the spindle assembly 1. The locking screw 2 is used to control the tightness of the locking block 4.

[0030] Next, assemble the mandrel assembly 1 into the pin hole inside the roller guide cylinder 6, with the center hole facing the end face. Tighten the locking screw 2 to push the locking block 4 to move and fix the mandrel assembly 1 in the pin hole. Then, through the center holes on both sides of the mandrel assembly 1, the outer circle of the roller guide cylinder 6 is machined by the ejector pin 7.

[0031] When the limit screw assembly 5 is used to fix the locking cover 3 and the locking block 4, the locking arm 55 inside the nut 52 is inserted into the groove of the mounting push rod 57 inside the mounting screw 51, thereby locking the mounting screw 51 and the nut 52. When the limit screw assembly 5 needs to be disassembled, a screwdriver is inserted into the square arm 53 to drive the square arm 53 to descend, which then moves against the two push rods 57 to push out the locking arm 55 inserted into the mounting screw 51. Then, the square arm 53 drives the mounting screw 51 to rotate, thereby unscrewing the mounting screw 51 and releasing the fixation of the locking cover 3 and the locking block 4.

[0032] By cooperating with the added locking screw 2, locking cover 3, locking block 4, and limit screw group 5, the mandrel group 1 is locked, thus providing a feasible solution for the grinding of the roller guide cylinder 6. At the same time, this device is applicable to the same structure as the roller guide cylinder 6, thereby improving the adaptability of the device during use and avoiding the inability of traditional tooling to provide high-precision machining conditions for the roller guide cylinder 6. Furthermore, the added limit screw group 5 automatically locks the position of the limit screw group 5 when fixing the locking cover 3 and locking block 4, avoiding the need for the traditional pin to lock the position of the limit screw group 5, thereby reducing the fixing steps and increasing the machining speed of the workpiece.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A universal self-centering fixture for grinding small cylindrical parts, comprising: The mandrel assembly (1) is characterized in that: a locking block (4) is assembled on the outside of the mandrel assembly (1), a locking cover (3) is assembled on the outside of the locking block (4), and a set of limiting screws (5) is evenly distributed between the locking cover (3) and the locking block (4), a locking screw (2) is threaded on the outside of the mandrel assembly (1), a roller guide cylinder (6) is assembled on the left side of the mandrel assembly (1), and pins (7) are assembled on both ends of the roller guide cylinder (6).

2. The universal self-centering fixture for grinding small cylindrical parts according to claim 1, characterized in that: The limiting screw assembly (5) includes an assembly screw (51) and a nut (52), and the assembly screw (51) is threaded to the outside of the nut (52), which is embedded in the outside of the locking cover (3).

3. The universal self-centering fixture for grinding small cylindrical parts according to claim 2, characterized in that: Both ends of the assembly screw (51) are slidably connected to push rods (57), and both sides of the assembly screw (51) are slidably connected to square arms (53).

4. A universal self-centering fixture for grinding small cylindrical parts according to claim 2, characterized in that: Hollow columns (54) are embedded at both ends of the nut (52). A locking arm (55) is slidably connected inside the hollow column (54), and a first spring (56) is connected between the locking arms (55).

5. A universal self-centering fixture for grinding small cylindrical parts according to claim 3, characterized in that: The mounting screw (51) has grooves (59) at both ends inside.

6. A universal self-centering fixture for grinding small cylindrical parts according to claim 5, characterized in that: The outer side of the square arm (53) is uniformly provided with a third spring (58), which is connected to the slide groove (59).

7. A universal self-centering fixture for grinding small cylindrical parts according to claim 5, characterized in that: The push rod (57) is externally connected to a second spring (571), which is connected to the slide groove (59).

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