CNC machining hexagonal hole rapid prototyping tool and machining process

Abstract

The present application relates to the technical field of hexagonal hole processing cutter, and discloses a CNC processing hexagonal hole rapid forming cutter and processing technology, the rapid forming cutter includes a handle and a hexagonal forming cutter, one end of the handle is connected with the hexagonal forming cutter, the other end of the handle is connected with a machine tool, the machine tool controls the hexagonal forming cutter to perform processing action through the handle, the hexagonal forming cutter includes a drilling part, a first rough milling part, a second rough milling part and a finishing milling part in sequence away from the handle, wherein one end of the drilling part is connected with one end of the handle, and the drilling part, the first rough milling part, the second rough milling part and the finishing milling part are integrally formed, that is, four cutters are integrated on one cutter, the drilling bottom hole, the first rough chamfering, the second rough chamfering and the finishing chamfering can be realized through the hexagonal forming cutter, the hexagonal hole can be processed by single cutter, the cutter can be replaced in the processing process, and the processing efficiency can be greatly improved.

Description

Technical Field

[0001] This invention relates to the technical field of hexagonal hole machining tools, and specifically to a CNC rapid prototyping tool and machining process for hexagonal holes. Background Technology

[0002] Hexagonal holes need to be machined on many automotive parts, such as automotive battery boxes. The radius of the hexagonal hole can only be within a small range to properly fix the hexagonal rivet bolt. Therefore, during the milling process, the machine tool must use a tool with a smaller radius than that of the hexagonal hole, and the hexagonal hole cannot be formed in one step.

[0003] In the existing technology, the process of forming a hexagonal hole involves first drilling a bottom hole with a drill bit, then switching to a large-diameter first milling cutter for roughing, then switching to a second milling cutter with a smaller diameter for semi-roughing, and finally switching to a small-diameter third milling cutter for finish milling. This means that four tools must be changed to complete the machining of a hexagonal hole. Each tool needs to be positioned, and the frequent tool changes and repeated positioning result in long machining time and low machining efficiency. Summary of the Invention

[0004] This invention addresses the aforementioned problems and aims to provide a CNC machining tool and machining process for hexagonal holes. It integrates four existing tools into one tool, which not only meets the requirements for machining hexagonal holes but also avoids frequent tool changes and improves machining efficiency.

[0005] To achieve the above objectives, the present invention provides a CNC machining hexagonal hole rapid prototyping tool, comprising a tool holder and a hexagonal forming tool. One end of the tool holder is connected to the hexagonal forming tool, and the other end of the tool holder is connected to a machine tool. The hexagonal forming tool includes a drilling portion, a first rough milling portion, a second rough milling portion, and a finish milling portion, sequentially located away from the tool holder. One end of the drilling portion is connected to one end of the tool holder, and the drilling portion, the first rough milling portion, the second rough milling portion, and the finish milling portion are integrally formed.

[0006] The diameter of the drilled portion is greater than the diameter of the first rough milling portion, the diameter of the first rough milling portion is greater than the diameter of the second rough milling portion, and the diameter of the second rough milling portion is greater than the diameter of the finish milling portion.

[0007] According to the above-described CNC machining hexagonal hole rapid prototyping tool, the diameter of the drilling part is smaller than the diameter of the tool holder, and a limiting step is provided between the drilling part and the tool holder.

[0008] According to the above-described CNC machining hexagonal hole rapid prototyping tool, the drilling part is provided with a first cutting edge, the first cutting edge is arranged in a spiral shape on the outside of the drilling part, and the outer diameter of the first cutting edge is 9.1mm.

[0009] According to the above-described CNC machining hexagonal hole rapid prototyping tool, the first rough milling part is provided with a second cutting edge, the second cutting edge is obliquely arranged on the outside of the first rough milling part, and the outer diameter of the second cutting edge is 5.8mm.

[0010] According to the above-described CNC machining hexagonal hole rapid prototyping tool, the second rough milling part is provided with a third cutting edge, the third cutting edge is obliquely arranged on the outside of the second rough milling part, and the outer diameter of the third cutting edge is 3.3mm.

[0011] According to the above-described CNC machining hexagonal hole rapid prototyping tool, the finish milling part is provided with a fourth cutting edge, the fourth cutting edge is obliquely arranged on the outside of the finish milling part, and the outer diameter of the fourth cutting edge is 2.3mm.

[0012] A hexagonal hole machining process using the aforementioned CNC machining rapid prototyping tool includes the following steps:

[0013] S1: Drilling the pilot hole: The product is opened through by the precision milling part, and the hole is enlarged by the drilling part to form the pilot hole;

[0014] S2: Rough chamfer: The tool is retracted so that the first rough milling part corresponds to the side wall of the bottom hole, and the first rough milling part is used to perform the first rough chamfer;

[0015] S3: Secondary rough chamfer: The tool is retracted so that the second rough milling part corresponds to the side wall of the bottom hole, and the second rough milling part is used to perform a secondary rough chamfer;

[0016] S4: Finishing: Retract the tool so that the finishing milling part corresponds to the side wall of the bottom hole, and use the finishing milling part to finish the chamfer after two rough millings;

[0017] S5: Retract the tool: Remove the tool from the product, and the product processing is complete.

[0018] According to the above-described hexagonal hole machining process, in step S1, the rotational speed of the precision milling part is 7500 rpm, and the feed speed of the precision milling part is 200 mm / min.

[0019] According to the above-described hexagonal hole machining process, in step S2, the rotational speed of the first rough milling part is 6500 rpm, and the feed rate of the first rough milling part is 2200 mm / min;

[0020] In step S3, the rotational speed of the second rough milling section is 8500 rpm, and the feed rate of the second rough milling section is 2200 mm / min.

[0021] According to the above-described hexagonal hole machining process, in step S4, the rotational speed of the precision milling part is 8500 rpm, and the feed speed of the precision milling part is 1200 mm / min.

[0022] The present invention has the following beneficial effects: The hexagonal forming tool includes a drilling part, a first rough milling part, a second rough milling part, and a finish milling part. When processing hexagonal holes, the product can be opened up first through the finish milling part, and then the hole can be enlarged through the drilling part to form the bottom hole. After that, the first rough milling part can be used for the first rough chamfering, and the second rough milling part can be used for the second rough chamfering. Finally, the finish milling part can be used for the finishing of the rough chamfering. That is, the processing of hexagonal holes can be completed with one tool, which can greatly improve the processing efficiency and make the processing simpler. At the same time, the two rough chamfering can effectively improve the service life of the finish milling part. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the embodiment;

[0024] Figure 2 This is another perspective view of the overall structure of the embodiment;

[0025] Figure 3 This is a process flow diagram of an embodiment.

[0026] In the figure: 1. Tool holder; 2. Hexagonal forming tool; 21. Drilling section; 211. First cutting edge; 22. First rough milling section; 221. Second cutting edge; 23. Second rough milling section; 231. Third cutting edge; 24. Finish milling section; 241. Fourth cutting edge; 25. Limiting step. Detailed Implementation

[0027] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solution of the present invention. However, the invention is not limited to these embodiments.

[0028] like Figure 1-2 As shown, a CNC machining tool for hexagonal holes includes a tool holder 1 and a hexagonal forming tool 2. One end of the tool holder 1 is connected to the hexagonal forming tool 2, and the other end of the tool holder 1 is connected to a machine tool. The machine tool controls the hexagonal forming tool 2 to perform machining operations through the tool holder 1. The hexagonal forming tool 2 includes a drilling section 21, a first rough milling section 22, a second rough milling section 23, and a finish milling section 24, which are sequentially located away from the tool holder 1. One end of the drilling section 21 is connected to one end of the tool holder 1, and the drilling section 21, the first rough milling section 22, the second rough milling section 23, and the finish milling section 24 are integrally formed, that is, four tools are integrated into one tool. The hexagonal forming tool 2 can realize drilling the bottom hole, the first rough chamfering, the second rough chamfering, and the finish chamfering. The hexagonal hole is formed with a single tool, which can avoid changing tools during the machining process and greatly improve the machining efficiency.

[0029] According to experiments conducted by those skilled in the art, machining a hexagonal hole, which previously took 45 seconds, now only takes 13 seconds using a rapid prototyping tool, which greatly improves machining efficiency.

[0030] Specifically, the diameter of the drilling section 21 is larger than the diameter of the first rough milling section 22, the diameter of the first rough milling section 22 is larger than the diameter of the second rough milling section 23, and the diameter of the second rough milling section 23 is larger than the diameter of the finish milling section 24. When using the hexagonal forming cutter 2, after drilling, the first rough milling section 22, the second rough milling section 23, and the finish milling section 24 can be used in sequence by retracting the cutter, which can avoid repeated retraction and advance actions and improve work efficiency.

[0031] The drilling section 21 is provided with a first cutting edge 211, which is spirally arranged on the outside of the drilling section 21 and has an outer diameter of 9.1 mm. When the drilling section 21 rotates, the first cutting edge 211 is used to machine the bottom hole. Due to some shrinkage after machining, the diameter of the bottom hole is approximately 9 mm. The first rough milling section 22 is provided with a second cutting edge 221, which is obliquely arranged on the outside of the first rough milling section 22 and has an outer diameter of 5.8 mm. The second cutting edge 221 is used to perform the first rough milling of the bottom hole to obtain a rough chamfer. The second rough milling section 23 is provided with a third cutting edge 231, which is obliquely arranged. On the outside of the second rough milling section 23, and with an outer diameter of 3.3 mm, the third cutting edge 231 is used for semi-roughing of the rough chamfer. The finish milling section 24 is provided with a fourth cutting edge 241, which is obliquely arranged on the outside of the finish milling section 24 and has an outer diameter of 2.3 mm. The fourth cutting edge 241 is used to finish the rough chamfer after semi-roughing so that its R angle meets the requirements. Moreover, after the finish finishing, two rough chamfering operations have been performed, which can reduce the cutting force on the finish milling section 24 and improve the service life of the finish milling section 24. Actual experiments have shown that the finish milling section 24 can be used in 3600 hexagonal hole machining operations, which greatly improves its economic benefits.

[0032] Furthermore, the diameter of the drilled part 21 is smaller than the diameter of the handle 1, and a limiting step 25 is provided between the drilled part 21 and the handle 1. The limiting step 25 can be used to restrict the hexagonal forming tool 2 from continuing to move downward after drilling is completed.

[0033] like Figure 1 and Figure 3 As shown, a hexagonal hole machining process using the aforementioned CNC machining hexagonal hole rapid prototyping tool includes the following steps:

[0034] S1: Drilling the bottom hole: The product is opened through by the milling part 24 and the hole is enlarged by the drilling part 21 to form the bottom hole. During this process, the rotation speed of the milling part 24 is 7500 rpm. Since the strength of the milling part 24 is not high, its feed speed is required to be slow. Therefore, its feed speed is only 200 mm / min.

[0035] S2: Rough chamfering: The tool is retracted so that the first rough milling part 22 corresponds to the side wall of the bottom hole, and the first rough milling part 22 is used to perform the first rough chamfering. The diameter of the first rough milling part 22 is relatively large, which is suitable for rough opening and the first rough chamfering. The rotation speed of the first rough milling part 22 is 6500 rpm, and the feed rate of the first rough milling part 22 is 2200 mm / min.

[0036] S3: Secondary rough chamfering: The tool is retracted so that the second rough milling part 23 corresponds to the side wall of the bottom hole, and a secondary rough chamfering is performed using the second rough milling part 23. The diameter of the second rough milling part 23 is smaller than that of the first rough milling part 22, so it can be used for semi-roughing, that is, performing secondary rough chamfering. This can reduce the cutting amount of the finish milling part 24, thereby reducing the force on the finish milling part 24 and improving the service life of the finish milling part 24. The rotational speed of the second rough milling part 23 is 8500 rpm, and the feed rate of the second rough milling part 23 is 2200 mm / min.

[0037] S4: Finishing: Retract the tool so that the finishing milling part 24 corresponds to the side wall of the bottom hole. Use the finishing milling part 24 to finish the chamfer after two rough milling operations. After finishing, the R angle of the hexagonal hole meets the requirements, and the machining of the hexagonal hole is completed. The rotation speed of the finishing milling part 24 is 8500 rpm, and the feed rate of the finishing milling part 24 is 1200 mm / min.

[0038] S5: Retract the tool: Remove the tool from the product. The product processing is complete. After retracting the tool, the finished product is obtained.

[0039] The technical solution of the present invention has been described in detail above with reference to the accompanying drawings. The described embodiments are used to help understand the concept of the present invention. The specific embodiments described herein are merely illustrative examples of the spirit of the present invention. Those skilled in the art to which this invention pertains can make various modifications or additions to the described specific embodiments or use similar methods to replace them, but without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0040] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0041] Furthermore, in this invention, descriptions involving terms such as "first," "second," and "a" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

Claims

1. A hexagonal hole machining process, characterized in that, A CNC machining tool for rapid prototyping of hexagonal holes is used. The tool includes a tool holder and a hexagonal forming tool. One end of the tool holder is connected to the hexagonal forming tool, and the other end of the tool holder is connected to a machine tool. The hexagonal forming tool includes a drilling section, a first rough milling section, a second rough milling section, and a finish milling section, sequentially located away from the tool holder. One end of the drilling section is connected to one end of the tool holder, and the drilling section, the first rough milling section, the second rough milling section, and the finish milling section are integrally formed. The diameter of the drilled portion is larger than the diameter of the first rough milling portion, the diameter of the first rough milling portion is larger than the diameter of the second rough milling portion, and the diameter of the second rough milling portion is larger than the diameter of the finish milling portion; The hexagonal hole machining process includes the following steps: S1: Drilling the pilot hole: The product is opened through by the precision milling part, and the hole is enlarged by the drilling part to form the pilot hole; S2: Rough chamfer: The tool is retracted so that the first rough milling part corresponds to the side wall of the bottom hole, and the first rough milling part is used to perform the first rough chamfer; S3: Secondary rough chamfer: The tool is retracted so that the second rough milling part corresponds to the side wall of the bottom hole, and the second rough milling part is used to perform a secondary rough chamfer; S4: Finishing: Retract the tool so that the finishing milling part corresponds to the side wall of the bottom hole, and use the finishing milling part to finish the chamfer after two rough millings; S5: Retract the tool: Remove the tool from the product, and the product processing is complete.

2. The hexagonal hole machining process according to claim 1, characterized in that, The diameter of the drilled part is smaller than the diameter of the tool holder, and a limiting step is provided between the drilled part and the tool holder.

3. The hexagonal hole machining process according to claim 1, characterized in that, The drilled portion is provided with a first cutting edge, which is arranged in a spiral shape on the outside of the drilled portion, and the outer diameter of the first cutting edge is 9.1 mm.

4. The hexagonal hole machining process according to claim 1, characterized in that, The first rough milling part is provided with a second cutting edge, which is inclinedly arranged on the outside of the first rough milling part, and the outer diameter of the second cutting edge is 5.8mm.

5. The hexagonal hole machining process according to claim 1, characterized in that, The second rough milling part is provided with a third cutting edge, which is obliquely arranged on the outside of the second rough milling part, and the outer diameter of the third cutting edge is 3.3mm.

6. The hexagonal hole machining process according to claim 1, characterized in that, The milling section is provided with a fourth cutting edge, which is obliquely arranged on the outside of the milling section, and the outer diameter of the fourth cutting edge is 2.3mm.

7. The hexagonal hole machining process according to claim 1, characterized in that, In step S1, the rotational speed of the precision milling section is 7500 rpm, and the feed rate of the precision milling section is 200 mm / min.

8. The hexagonal hole machining process according to claim 1, characterized in that, In step S2, the rotational speed of the first rough milling section is 6500 rpm, and the feed rate of the first rough milling section is 2200 mm / min; In step S3, the rotational speed of the second rough milling section is 8500 rpm, and the feed rate of the second rough milling section is 2200 mm / min.

9. The hexagonal hole machining process according to claim 1, characterized in that, In step S4, the rotational speed of the precision milling section is 8500 rpm, and the feed rate of the precision milling section is 1200 mm / min.

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