Curved surface part machining and positioning tool

Abstract

The utility model provides a curved surface type part machining positioning tool which comprises a tool body and a pressing plate tool body. The tool body is arranged on a machine tool workbench, and the tool body is used for containing a part to be machined. The tool body is of a rectangular structure. A first positioning groove and a second positioning groove are formed in the upper surface of the tool body in the length direction, and the bottom face of the first positioning groove and the bottom face of the second positioning groove are both curved faces corresponding to a to-be-machined part. A plurality of groups of positioning pins are further arranged on the upper surface of the tool body; the multiple pressing plates are arranged on the upper surface of the tool body. Each pressing plate is of a rectangular structure, and an oval through hole is formed in the center of the upper surface of each pressing plate in the height direction; the multiple pressing plates are used for extruding to-be-machined parts fixedly placed on the upper surface of the tool body. According to the embodiment, the problem that an existing tool clamp is unstable in positioning of a machined part with the bottom face being a curved face is solved, and cutter vibration in the machining process due to insufficient rigidity is also eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, in particular to a processing and positioning tool for curved surface parts. Background Art

[0002] At present, with the rapid development of the automobile industry, the requirements for the performance and stability of materials used in automobile parts are getting higher and higher. Since automobile parts are produced in large quantities and on a large scale through intelligent means, in order to ensure their quality, appearance and safety, safe, reliable and scientific processing methods have become conventional requirements. There are more and more curved parts, and the clamping and positioning of curved parts are relatively complex and difficult compared to conventional parts. How to quickly solve the tooling problem of processing curved parts on the production line has been put on the agenda. There are not only metal parts processing, but also more plastic parts. There are more and more curved parts that need to remove the flash of the gate. The general tooling of the curved parts production line (such as flat-mouth vises, three-jaw chucks, etc.) often cannot solve the problem. On-site technicians are needed to quickly solve the tooling design, application and technical problems of such parts. Therefore, the application of tooling for processing and positioning of curved parts has become a problem that must be solved in this field.

[0003] There are a large number of plastic parts in the automotive industry. In order to meet the texture and aesthetics of the appearance, the surfaces of many parts are designed into various curved surfaces. Injection molded products have gates, flash and burrs just produced by the injection molding machine, and these need to be removed manually. Therefore, removing gates, flash and burrs has become an indispensable processing step for injection molded products. However, how to quickly and effectively achieve the removal effect requires the technicians of the production line to select the most appropriate method according to the shape characteristics of the parts. Some of the gates and flash burrs of some parts are relatively strong and cannot be removed manually, so they need to be removed by mechanical processing equipment. In addition, if you encounter curved parts that cannot be directly positioned and pressed on the equipment for processing, you need to solve the design problem of curved parts processing positioning tooling. Since the clamping and positioning reference of curved parts is not a plane, if the tooling design is not appropriate, it is very easy for parts to vibrate and move during the processing, resulting in a large number of scraps in the process of removing flash, gates and burrs of parts. The last process will cause the parts to be scrapped, which will not only lead to a serious increase in costs, but also affect the final delivery process of customers. Therefore, how to reduce scrap in the process of removing gates, flash and burrs is the most important issue to ensure the quality of the final product and reduce economic losses.

[0004] In order to reduce the failure rate of curved injection molded parts in the process of removing flash, gates and burrs, it is necessary to make special positioning tooling and complete the processing of this process on a CNC machine tool to avoid various unstable factors caused by manual operation. The whole process is fully mechanized and solidified. The parts held by people are replaced with positioning tooling to clamp them and make the process procedural.

[0005] Through the above analysis, the problems and defects of the prior art are as follows: in the process of removing the flash gate burrs of curved injection molded parts, since the gate burrs are relatively thick and solid, manual removal is basically impossible to achieve, and automated equipment is required to improve efficiency and quality; however, when removing them on CNC equipment, the commonly used general tooling (flat vise, three-jaw) cannot be applied in the field of curved part processing, and special tooling must be designed according to the product characteristics. Utility Model Content

[0006] The main purpose of the utility model is to provide a curved surface part processing positioning tool, so as to at least solve the problem that the existing tooling fixtures in the prior art are unstable in positioning the processed parts with curved bottom surfaces.

[0007] In order to achieve the above-mentioned purpose, the utility model provides a tooling for positioning curved surface parts processing, including: a tooling body and a pressure plate. The tooling body is arranged on a machine tool worktable, and the tooling body is used to place the parts to be processed; the tooling body is a rectangular structure; the upper surface of the tooling body is provided with a first positioning groove along the length direction and a second positioning groove along the length direction, and the bottom surfaces of the first positioning groove and the second positioning groove are both curved surfaces corresponding to the parts to be processed; the upper surface of the tooling body is also provided with multiple groups of positioning pins; there are multiple pressure plates, and the multiple pressure plates are all arranged on the upper surface of the tooling body; each pressure plate is a rectangular structure, and the center of the upper surface of each pressure plate is provided with an elliptical through hole along the height direction; the multiple pressure plates are used to squeeze and fix the parts to be processed placed on the tooling body.

[0008] Furthermore, a tool setting hole and a plurality of fixing holes are also provided on the upper surface of the tool body. The tool setting hole is a blind hole, and the plurality of fixing holes are through holes.

[0009] Furthermore, the inner diameter machining accuracy of the tool hole is within 0.02, and the roughness reaches 1.6.

[0010] Furthermore, the number of the plurality of fixing holes is four.

[0011] Furthermore, a process clearance groove is provided on the bottom surface of the first positioning groove.

[0012] Furthermore, each group of positioning pins has three members; the first group of positioning pins is arranged in the first positioning groove, and the second group of positioning pins is arranged in the second positioning groove.

[0013] Furthermore, one end of each of the plurality of pressing plates along the length direction is chamfered.

[0014] The technical solution of the utility model is a curved surface part processing positioning tool, comprising: a tool body and a pressure plate. The tool body is arranged on the workbench of a machine tool, and the tool body is used to place the parts to be processed; the tool body is a rectangular structure; the upper surface of the tool body is provided with a first positioning groove along the length direction and a second positioning groove along the length direction, and the bottom surfaces of the first positioning groove and the second positioning groove are both curved surfaces corresponding to the parts to be processed; the upper surface of the tool body is also provided with multiple groups of positioning pins; there are multiple pressure plates, and the multiple pressure plates are all arranged on the upper surface of the tool body; each pressure plate is a rectangular structure, and the center of the upper surface of each pressure plate is provided with an elliptical through hole along the height direction; the multiple pressure plates are used to squeeze and fix the parts to be processed placed on the upper surface of the tool body. The utility model discloses a curved surface part processing and positioning fixture that can accurately install and position curved surface parts, and ensure a stable, reliable and unique position, and has repeatability reliability during adjustment or replacement, provides sufficient support surface for parts and bears a large cutting force, ensures a stable processing process of parts on the fixture, and can avoid various phenomena such as unstable positioning and unreliable processing of curved surface parts, effectively ensures processing quality and efficiency, stabilizes production rhythm, and reduces scrap rate. This embodiment solves the problem of unstable positioning of processed parts with curved bottom surfaces in existing fixtures, and also eliminates the poor processing quality of processed parts caused by tool vibration during processing due to insufficient rigidity. This embodiment sets the tool setting hole to obtain relatively accurate tool setting parameters, so that the processed parts can obtain more accurate processing data, reduce the number of scrapped parts due to machine adjustment, and use machine tools to replace the previous process of manually removing flash gate burrs, thereby improving processing efficiency, obtaining more stable processing quality and precision, and effectively ensuring production order. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of the present application 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 an improper limitation on the present invention. In the drawings:

[0016] Figure 1 It is a structural schematic diagram of a curved surface parts processing and positioning tooling which can be selected according to an embodiment of the utility model;

[0017] Figure 2 It is a structural schematic diagram of a tool body of a curved surface part processing and positioning tool that can be selected according to an embodiment of the utility model;

[0018] Figure 3 It is a front view of a tool body of a curved surface part processing and positioning tool that can be selected according to an embodiment of the utility model;

[0019] Figure 4 It is a first cross-sectional view of a tool body of a curved surface part processing and positioning tool that can be selected according to an embodiment of the utility model;

[0020] Figure 5 It is a second cross-sectional view of a tool body of a curved surface part processing and positioning tool that can be selected according to an embodiment of the utility model;

[0021] Figure 6 It is a third cross-sectional view of a tool body of a curved surface part processing and positioning tool that can be selected according to an embodiment of the utility model.

[0022] The above drawings include the following reference numerals:

[0023] 10. Tool body; 11. First positioning groove; 12. Second positioning groove; 13. Positioning pin; 14. Tool setting hole; 15. Fixing hole; 16. Process clearance groove; 20. Press plate. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] A curved surface parts processing and positioning tooling according to an embodiment of the utility model is provided. Figure 1 As shown, it includes: a tool body 10 and a pressing plate 20; the tool body 10 is arranged on the workbench of the machine tool, and the tool body 10 is used to place the parts to be processed; the tool body 10 is a rectangular structure; the upper surface of the tool body 10 is provided with a first positioning groove 11 along the length direction and a second positioning groove 12 along the length direction, and the bottom surfaces of the first positioning groove 11 and the second positioning groove 12 are both curved surfaces corresponding to the parts to be processed; the upper surface of the tool body 10 is also provided with multiple groups of positioning pins 13; there are multiple pressing plates 20, and the multiple pressing plates 20 are all arranged on the upper surface of the tool body 10; each pressing plate 20 is a rectangular structure, and the center of the upper surface of each pressing plate 20 is provided with an elliptical through hole along the height direction; the multiple pressing plates 20 are used to squeeze and fix the parts to be processed placed on the tool body 10.

[0026] As an optimization solution of this embodiment, Figure 2 As shown, the bottom surfaces of the first positioning groove 11 and the second positioning groove 12 are respectively provided with curved mounting reference surfaces corresponding to the parts to be processed, and the curved mounting reference surfaces provide sufficient load-bearing capacity for the tooling and reliability of positioning the parts to be processed.

[0027] Furthermore, if Figure 3 , Figure 4 , Figure 5 as well as Figure 6As shown, the upper surface of the tool body 10 is also provided with a tool setting hole 14 and a plurality of fixing holes 15. The tool setting hole 14 is a blind hole, and the plurality of fixing holes 15 are through holes. The tool setting hole 14 is used to determine the specific position of the machine tool relative to the tool. The fixing holes 15 are provided to connect and fasten the tool body 10 to the machine tool worktable.

[0028] Furthermore, the inner diameter machining accuracy of the tool hole 14 is within 0.02, and the roughness reaches 1.6.

[0029] Further, there are four fixing holes 15. Optionally, a fastening screw is used in the fixing hole 15 to fasten the tool body 10 and the machine tool workbench with a trapezoidal nut in a trapezoidal groove to ensure sufficient rigidity of the tool body 10.

[0030] Furthermore, a process clearance groove 16 is provided on the bottom surface of the first positioning groove 11, and the process clearance groove 16 is used to reduce the contact area between the part to be processed and the curved mounting reference surface, reduce the processing difficulty of the curved mounting reference surface, and prevent the part to be processed from being over-positioned.

[0031] As an optimization solution of this embodiment, each group of positioning pins 13 has three. Two positioning pins 13 of each group of positioning pins 13 are arranged on one of the side walls of the corresponding positioning groove along the width direction; the third positioning pin 13 of the first positioning groove 11 is arranged in the process clearance groove 16, and the third positioning pin 13 of the second positioning groove 12 is arranged on one of the side walls along the length direction. The two positioning pins 13 arranged on the same side wall are used to limit the installation direction of the part to be processed and further limit the degree of freedom in the vertical direction. The single positioning pin 13 is used to limit the degree of freedom of the part to be processed in the horizontal direction, so as to achieve a unique and accurate position for the installation of the part to be processed.

[0032] Furthermore, one end of each of the plurality of pressing plates 20 along the length direction is chamfered.

[0033] When the utility model is used, the tool body 10 is first fixed on the machine tool workbench through the positioning holes and the fastening bolts; then the part to be processed is placed on the tool body 10, the curved surface of the part to be processed is accurately fitted with the curved surface of the tool body 10, and the positioning pin 13 is used to accurately limit the only position to be processed; finally, the part to be processed is fixed by the pressing plate 20. The machine tool tool can find the zero point through the tool setting hole 14 on the tool body 10, so as to obtain the relative position of each tool to ensure the processing accuracy.

[0034] Combining all the above technical solutions, the advantages and positive effects of the utility model are as follows:

[0035] 1. The utility model is suitable for parts with curved positioning surfaces, and can maintain the accurate positional relationship between curved parts and tooling, maintain stable positioning accuracy, and avoid quality problems caused by excessive positioning errors;

[0036] 2. The utility model effectively solves the problems of difficulty, low pass rate and low efficiency in manually removing gate flash burrs from curved injection molded parts, which effectively guarantees the pass rate; stabilizes the normal production order of the production line, brings significant economic effects, and replaces traditional manual operations with CNC equipment, which increases production efficiency by 375%.

[0037] 3. Effects and advantages obtained by comparing experimental or test data with existing technologies:

[0038] Table 1 Comparison of effects before and after using the utility model

[0039] Period (average) Scrap quantity / year Annual Output Before use 1 300 2400 After use 1 5 9000

[0040] As shown in Table 1, before using the utility model, the number of scrapped parts per year was 300. After using the utility model, the number of scrapped parts per year was 5, and the scrap rate was significantly reduced. The annual output was also increased from the original 2,400 pieces to 9,000 pieces, and the processing efficiency was also greatly improved, with significant economic effects.

[0041] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A tooling for machining and positioning curved surface parts, characterized in that: include: A tool body (10), the tool body (10) is arranged on a machine tool workbench, and the tool body (10) is used to place a part to be processed; the tool body (10) is a rectangular structure; the upper surface of the tool body (10) is provided with a first positioning groove (11) along the length direction and a second positioning groove (12) along the length direction, and the bottom surfaces of the first positioning groove (11) and the second positioning groove (12) are curved surfaces corresponding to the part to be processed respectively; the upper surface of the tool body (10) is also provided with a plurality of groups of positioning pins (13); A pressing plate (20), wherein there are a plurality of pressing plates (20), and the plurality of pressing plates (20) are all arranged on the upper surface of the tooling body (10); the plurality of pressing plates (20) are all rectangular structures, and the centers of the upper surfaces of the plurality of pressing plates (20) are all provided with elliptical through holes along the height direction; the plurality of pressing plates (20) are used to press and fix the parts to be processed placed on the tooling body (10).

2. The curved surface parts processing and positioning tool according to claim 1 is characterized in that: The upper surface of the tool body (10) is also provided with a tool setting hole (14) and a plurality of fixing holes (15); the tool setting hole (14) is a blind hole, and the plurality of fixing holes (15) are all through holes.

3. The curved surface parts processing and positioning tool according to claim 2 is characterized in that: The inner diameter machining accuracy of the tool hole (14) is within 0.02, and the roughness reaches 1.

6.

4. The curved surface parts processing and positioning tool according to claim 2, characterized in that: The number of the plurality of fixing holes (15) is four.

5. The curved surface parts processing and positioning tool according to claim 1, characterized in that: The bottom surface of the first positioning groove (11) is provided with a process clearance groove (16).

6. The curved surface parts processing and positioning tool according to claim 5, characterized in that: Each group of the positioning pins (13) comprises three; the first group of the positioning pins (13) are arranged in the first positioning grooves (11), and the second group of the positioning pins (13) are arranged in the second positioning grooves (12).

7. The curved surface parts processing and positioning tool according to claim 1, characterized in that: One end of each of the plurality of pressing plates (20) along the length direction is chamfered.

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