Clamp for synchronously grinding multiple ultra-thin parts and application

Abstract

The clamp comprises a body and a spacer bush, a plurality of cylindrical holes are formed in the end face of one side of the body, part positioning holes in one-to-one correspondence with the cylindrical holes are formed in the spacer bush, the part positioning holes are each of a through hole structure, the cylindrical holes are each of a blind hole structure, and the cylindrical holes are communicated with the cylindrical holes. The body is detachably connected with the spacer bush through a connecting piece; a step pin is installed in each cylindrical hole of the body, the small-diameter section of each step pin is matched with the corresponding cylindrical hole, the large-diameter section of each step pin is matched with a part positioning hole in the corresponding spacer bush, the outer end face of the large-diameter section of each step pin is located in the same plane, and the distance between the outer end face of the large-diameter section of each step pin and the outer end face of the corresponding spacer bush is smaller than the thickness of a finished workpiece. The clamp is simple in structure and reasonable in design, precise positioning of an ultra-thin part on the clamp is achieved, the shape tolerance requirements of flatness and parallelism of the ground part are met, meanwhile, the clamp is convenient and fast to assemble and disassemble the part, and the production preparation time is shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation process equipment, and in particular relates to a fixture for synchronous grinding of multiple extremely thin parts and its application. Background Art

[0002] The nozzle of the electro-hydraulic servo valve in the aircraft engine has small dimensions and extremely thin thickness, and the required shape tolerance is extremely strict. In the production process, the flatness and parallelism are guaranteed by grinding. If such thin parts are directly ground by hand on the grinding platform, the accuracy cannot be guaranteed, and the production efficiency of manual grinding is very low. There is a lack of grinding fixtures specifically for such parts in the existing technology. Ordinary fixtures are difficult to clamp and fix extremely thin workpieces firmly, and are easy to damage the workpieces. Therefore, it is necessary to design a fixture specifically for the grinding of such extremely thin parts. Summary of the invention

[0003] In view of this, the present invention aims to overcome the defects in the prior art and proposes a fixture and application for synchronous grinding of multiple extremely thin parts.

[0004] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0005] A fixture for synchronous grinding of multiple extremely thin parts comprises a main body and a spacer sleeve, wherein a plurality of cylindrical holes are arranged on one end face of the main body, and a part positioning hole corresponding to each cylindrical hole is arranged on the spacer sleeve, wherein the part positioning holes are all through hole structures, and the cylindrical holes are all blind hole structures, and the main body and the spacer sleeve are detachably connected via a connecting piece; a step pin is installed in each cylindrical hole of the main body, wherein the small diameter section of the step pin cooperates with the cylindrical hole, and the large diameter section cooperates with the part positioning hole on the corresponding spacer sleeve, the outer end faces of the large diameter sections of each step pin are in the same plane, and the distance between the outer end faces of the large diameter sections of each step pin and the outer end face of the spacer sleeve is less than the thickness of the finished workpiece.

[0006] Furthermore, the main body and the spacer are connected by screws, two threaded holes are provided on the main body, and screw penetration holes corresponding to the two threads are provided on the spacer.

[0007] Furthermore, the two threaded holes are symmetrically arranged with the center of the body as the center.

[0008] Furthermore, the main body adopts a stepped shaft structure, and each cylindrical hole is arranged at the end with a larger diameter.

[0009] Furthermore, six cylindrical holes are provided on the main body.

[0010] A method for synchronously grinding multiple extremely thin parts using the above-mentioned fixture comprises the following steps:

[0011] Press-fit multiple positioning pins into the cylindrical holes of the body respectively, and then grind the plane formed by the outer end faces of each positioning pin flat, with a flatness of no more than 0.001 mm;

[0012] Assemble the spacer together with the positioning holes and positioning pins one by one, and then fasten the two screws to the body through the screw holes on the spacer;

[0013] Place multiple workpieces to be processed into the part positioning holes of the spacer sleeve respectively, and the inner end of each workpiece to be processed abuts against the outer end surface of the step pin;

[0014] Perform grinding process;

[0015] After grinding, unscrew the two screws used to fix the spacer, then separate the spacer from the body, and then remove the ground workpiece from the spacer.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The invention has a simple structure and reasonable design, and can realize the precise positioning of extremely thin parts on the fixture, ensuring the shape tolerance requirements of the flatness and parallelism of the parts after grinding. At the same time, the fixture is convenient and quick to load and unload parts, reducing the production preparation time. When in use, the flatness of the plane formed by the outer end faces of each locating pin is no more than 0.001mm, which can ensure the precise positioning of the parts and the flatness requirements after grinding. Multiple workpieces can be clamped at one time, and grinding processing can be realized at the same time, which greatly improves the efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 A schematic diagram of the structure created by the present invention;

[0020] Figure 2 A top view created for the present invention;

[0021] Figure 3 for Figure 2 Sectional view in the AA direction;

[0022] Figure 4 It is a schematic diagram of the structure of the main body of the invention;

[0023] Figure 5 A schematic diagram of the structure of the spacer sleeve part in the invention;

[0024] Figure 6 The present invention is a schematic structural diagram of the step pin portion. DETAILED DESCRIPTION

[0025] 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.

[0026] 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 a limitation on the present invention. In addition, the terms "first", "second", etc. 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", etc. 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.

[0027] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 invention can be understood according to specific circumstances.

[0028] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0029] A fixture for simultaneous grinding of multiple extremely thin parts, such as Figures 1 to 6 As shown, it includes a main body 1 and a spacer 2, a plurality of cylindrical holes 3 are provided on one end face of the main body, and a part positioning hole 4 corresponding to each cylindrical hole is provided on the spacer. The part positioning holes are all through hole structures, and the cylindrical holes are all blind hole structures. The main body and the spacer are detachably connected through a connecting piece; a step pin 5 is installed in each cylindrical hole of the main body, and the small diameter section 51 of the step pin cooperates with the cylindrical hole, and the large diameter section 52 cooperates with the part positioning hole on the corresponding spacer.

[0030] The outer end faces of the large diameter sections of each step pin are in the same plane, and the distance b between the outer end faces of the large diameter sections of each step pin and the outer end face of the spacer is less than the thickness of the finished workpiece, that is, a groove 7 is formed between the step pin and the part positioning hole of the spacer, and the depth of the groove is less than the thickness of the finished workpiece, ensuring that the tool will not interfere with the spacer during grinding. As an example, 6 cylindrical holes are provided on the body.

[0031] The body and the spacer are connected by screws 6. Specifically, two threaded holes are provided on the body, and screw holes corresponding to the two threads are provided on the spacer. The thickness of the spacer is greater than the height of the nut of the screw used to connect the spacer and the body, and the nut of the screw is partially immersed in the screw hole to avoid interference when grinding the workpiece. As an example, the screw can be a hexagon socket screw, a slotted screw, a cross screw or other fastening screws that can be easily screwed into the threaded hole.

[0032] The two threaded holes are arranged symmetrically with the center of the body as the center. The body adopts a stepped shaft structure, and each cylindrical hole is arranged at the end with a larger diameter. The end with a smaller diameter of the body is fixed to the machine tool clamp or other fixing device, so that the grinding equipment can easily grind the workpiece at the large diameter end of the body. Preferably, the small diameter section of the step pin has an interference fit with the cylindrical hole to ensure that the step pin and the body are firmly and stably matched, and the step pin will not fall off the body when installing or removing the spacer, and the large diameter section of the step pin has a clearance fit with the part positioning hole, which is convenient for the installation and removal of the spacer, and thus convenient for the installation and removal of the workpiece.

[0033] A method for synchronously grinding multiple extremely thin parts using the above-mentioned fixture comprises the following steps:

[0034] Press-fit multiple positioning pins into the cylindrical holes of the body respectively, and then grind the plane formed by the outer end faces of each positioning pin flat, with a flatness of no more than 0.001 mm;

[0035] Assemble the spacer together with the positioning holes and positioning pins one by one, and then fasten the two screws to the body through the screw holes on the spacer;

[0036] Place multiple workpieces to be processed into the part positioning holes of the spacer sleeve respectively, and the inner end of each workpiece to be processed abuts against the outer end surface of the step pin;

[0037] Perform grinding process;

[0038] After grinding, unscrew the two screws used to fix the spacer, then separate the spacer from the body, and then remove the ground workpiece from the spacer.

[0039] The invention has a simple structure and reasonable design, and can realize the precise positioning of extremely thin parts on the fixture, ensuring the shape tolerance requirements of the flatness and parallelism of the parts after grinding. At the same time, the fixture is convenient and quick to load and unload parts, reducing the production preparation time. When in use, the flatness of the plane formed by the outer end faces of each locating pin is no more than 0.001mm, which can ensure the precise positioning of the parts and the flatness requirements after grinding. Multiple workpieces can be clamped at one time, and grinding processing can be realized at the same time, which greatly improves the efficiency.

[0040] 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 fixture for synchronous grinding of multiple extremely thin parts, characterized by: It includes a main body and a spacer sleeve, and a plurality of cylindrical holes are provided on one end face of the main body, and a part positioning hole corresponding to each cylindrical hole is provided on the spacer sleeve, and the part positioning holes are all through hole structures, and the cylindrical holes are all blind hole structures. The main body and the spacer sleeve are detachably connected through a connecting piece; a step pin is installed in each cylindrical hole of the main body, and the small diameter section of the step pin cooperates with the cylindrical hole, and the large diameter section cooperates with the corresponding part positioning hole on the spacer sleeve, the outer end faces of the large diameter sections of each step pin are in the same plane, and the distance between the outer end face of the large diameter section of each step pin and the outer end face of the spacer sleeve is less than the thickness of the finished workpiece.

2. A fixture for synchronous grinding of multiple extremely thin parts according to claim 1, characterized in that: The main body is connected with the spacer by screws. Two threaded holes are arranged on the main body, and screw penetration holes corresponding to the two threads are arranged on the spacer.

3. A fixture for synchronous grinding of multiple extremely thin parts according to claim 1, characterized in that: The two threaded holes are symmetrically arranged with the center of the body as the center.

4. A fixture for synchronous grinding of multiple extremely thin parts according to claim 1, characterized in that: The main body adopts a stepped shaft structure, and each cylindrical hole is arranged at the end with a larger diameter.

5. The fixture for synchronous grinding of multiple extremely thin parts according to claim 1, characterized in that: The main body is provided with 6 cylindrical holes.

6. A method for synchronously grinding multiple ultra-thin parts using the fixture according to any one of claims 1 to 5, characterized in that: The steps include: Press-fit multiple positioning pins into the cylindrical holes of the body respectively, and then grind the plane formed by the outer end faces of each positioning pin flat, with a flatness of no more than 0.001 mm; Assemble the spacer together with the positioning holes and positioning pins one by one, and then fasten the two screws to the body through the screw holes on the spacer; Place multiple workpieces to be processed into the part positioning holes of the spacer sleeve respectively, and the inner end of each workpiece to be processed abuts against the outer end surface of the step pin; Perform grinding process; After grinding, unscrew the two screws used to fix the spacer, then separate the spacer from the body, and then remove the ground workpiece from the spacer.

Images