Cutter structure for milling inner hole in cylinder head

Abstract

The utility model provides a cylinder head inner hole milling cutter structure which comprises a cutter bar, the cutter bar comprises an upper cutter bar body fixed in a machine tool, a lower cutter bar body is detachably connected in the upper cutter bar body, a first connecting hole and a second connecting hole are formed in the lower cutter bar body, and the first connecting hole is communicated with the second connecting hole. Threaded holes penetrating through the first connecting hole and the second connecting hole are further formed in the lower cutter bar, and the two threaded holes are perpendicular to the first connecting hole and the second connecting hole respectively; the rough boring tool bit is connected into the first connecting hole, a positioning hole is formed in the middle of the rough boring tool bit, when the rough boring tool bit is positioned and connected into the first connecting hole, the rough boring tool bit is positioned through a first screw, and the rough boring tool bit comprises two cutting edges; and the fine boring tool bit is connected in the second connecting hole, and a positioning hole is also formed in the middle of the fine boring tool bit. According to the inner hole milling cutter structure, the rough boring cutter head and the fine boring cutter head are arranged on the lower cutter bar, so that an inner hole of a cylinder head can be machined at a time, and the machining efficiency of the inner hole of the cylinder head is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cylinder head processing, in particular to a cylinder head inner hole milling tool structure. Background Art

[0002] In modern manufacturing, the machining accuracy and efficiency of engine cylinder heads are key factors affecting engine performance and production costs. Cylinder head inner hole machining is one of the important processes, which usually includes two steps: rough milling and fine milling. In traditional processes, these two processes usually require different tools and are performed in different processing steps. This process has the following main problems:

[0003] 1. Long processing time: After the rough milling is completed, the tool needs to be replaced for fine milling, which not only increases the processing time, but also increases the non-cutting time of production and reduces production efficiency.

[0004] 2. High tool cost: Two different tools need to be purchased and maintained, which increases manufacturing costs and management complexity.

[0005] 3. Limited processing accuracy: Errors may be introduced during multiple clamping and tool replacement, affecting the final processing accuracy. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a cylinder head inner hole milling tool structure, which can process the inner hole of the cylinder head at one time by arranging a rough boring head and a fine boring head on a lower tool rod, thereby effectively improving the processing efficiency of the cylinder head inner hole.

[0007] To achieve the above purpose, the utility model adopts the following technical solution: a cylinder head inner hole milling tool structure, comprising:

[0008] A tool bar, the tool bar comprising an upper tool bar fixed in the machine tool, the upper tool bar being detachably connected to a lower tool bar, the lower tool bar being provided with a first connecting hole and a second connecting hole, the lower tool bar being further provided with a threaded hole penetrating the first connecting hole and the second connecting hole, the two threaded holes being respectively perpendicular to the first connecting hole and the second connecting hole;

[0009] A rough boring head, the rough boring head is connected to the first connecting hole, a positioning hole is opened in the middle of the rough boring head, when the rough boring head is positioned and connected in the first connecting hole, it is positioned by a first screw, and the rough boring head includes two cutting edges;

[0010] A fine boring head, the fine boring head is connected to the second connecting hole, a positioning hole is also opened in the middle of the fine boring head, when the fine boring head is positioned and connected to the second connecting hole, it is positioned by a second screw, and the fine boring head also includes two cutting edges;

[0011] When the inner hole of the cylinder head is milled, the height of the cutting edge of the rough boring cutter head is lower than the height of the cutting edge of the fine boring cutter head.

[0012] Furthermore, the first connecting hole and the second connecting hole are both square holes, the rough boring head includes an upper horizontal surface and a lower horizontal surface matching the first connecting hole, and the fine boring head includes an upper horizontal surface and a lower horizontal surface matching the second connecting hole.

[0013] Furthermore, the two cutting edges of the rough boring tool head and the fine boring tool head are both centrally symmetrically arranged.

[0014] Furthermore, the lower cutter bar includes a thin-diameter head, and the upper cutter bar includes a fixing hole, and the thin-diameter head is fixedly connected in the fixing hole by a screw and a nut.

[0015] Furthermore, when machining the cylinder head, the exposed cutting edges of the rough boring cutter head and the fine boring cutter head are inclined downward by 2-5 degrees, and at the same time, the exposed cutting edges of the rough boring cutter head and the fine boring cutter head are inclined inward by 2-5 degrees.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The inner hole milling tool structure can process the inner hole of the cylinder head at one time by arranging a rough boring head and a fine boring head on the lower tool bar, which effectively improves the processing efficiency of the inner hole of the cylinder head;

[0018] 2. Since both the rough boring head and the fine boring head have two cutting edges, the heads can be turned over after being worn out for a long time, so that they can continue to be used, which increases the life of the heads by 2 times;

[0019] 3. Since the exposed cutting edges of the rough boring head and the fine boring head are tilted downward by 2-5 degrees and tilted inward by 2-5 degrees, the processing can be smoother. When milling the inner hole of the cylinder head, the inner hole of the cylinder head can be milled step by step, which makes the milling effect better. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2 It is a cross-sectional structural diagram of the utility model;

[0022] Figure 3 It is a structural diagram of a rough boring cutter head and a fine boring cutter head of the utility model;

[0023] Figure 4 This is a structural diagram of the first screw and the second screw of the utility model;

[0024] Figure 5 It is the front view of the utility model;

[0025] Figure 6 It is a top view of the utility model.

[0026] In the figure: 1, upper tool bar; 2, lower tool bar; 3, first connecting hole; 4, second connecting hole; 5, threaded hole; 6, rough boring head; 7, first screw; 8, cutting edge; 9, fine boring head; 8, second screw; 9, long screw; 10, nut; 11, positioning head; 12, upper horizontal surface; 13, lower horizontal surface; 14, thin-diameter head; 15, fixing hole; 16, positioning hole; DETAILED DESCRIPTION

[0027] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0028] like Figure 1-6 A cylinder head inner hole milling tool structure shown includes:

[0029] A tool bar, the tool bar comprising an upper tool bar 1 fixed in the machine tool, a lower tool bar 2 detachably connected to the upper tool bar 1, a first connecting hole 3 and a second connecting hole 4 are formed on the lower tool bar 2, a threaded hole 5 penetrating the first connecting hole 3 and the second connecting hole 4 is also formed on the lower tool bar 2, and the two threaded holes 5 are respectively perpendicular to the first connecting hole 3 and the second connecting hole 4;

[0030] A rough boring head 6, the rough boring head 6 is connected to the first connecting hole 3, a positioning hole is opened in the middle of the rough boring head 6, when the rough boring head 6 is positioned and connected to the first connecting hole 3, it is positioned by a first screw 7, and the rough boring head 6 includes two cutting edges 8;

[0031] A fine boring head 9, the fine boring head 9 is connected to the second connecting hole 4, a positioning hole is also opened in the middle of the fine boring head 9, when the fine boring head 9 is positioned and connected to the second connecting hole 4, it is positioned by a second screw 8, and the fine boring head 9 also includes two cutting edges 8;

[0032] When the inner hole of the cylinder head is milled, the height of the cutting edge 8 of the rough boring tool head 6 is lower than the height of the cutting edge 8 of the fine boring tool head 9 .

[0033] The process of using the utility model is as follows: first, the rough boring head 6 and the fine boring head 9 are fixed in the lower tool bar respectively. Specifically, a positioning hole is opened in the middle of the rough boring head 6 and the fine boring head 9, and the first screw and the second screw in the threaded hole are tightened in the threaded hole. The positioning head 11 at the end of the first screw and the second screw is matched with the positioning hole 16 of the tool head, so as to realize the firm positioning of the rough boring head 6 and the fine boring head 9. After the tool head is positioned and installed, the cylinder head is fixed on the clamping device for positioning. After the head positioning is completed, the spindle of the milling machine is started, and the tool bar connected to the spindle moves downward. Since the cutting edge 8 of the rough boring head 6 is lower than the fine boring head 9, it will first contact the inner hole of the cylinder head to perform rough milling on the cylinder head. Due to the high-speed rotation of the tool bar, the rough milling of the inner hole of the cylinder head can be completed in a very short time. Subsequently, the fine boring head 9 will continue to contact the inner hole of the cylinder head and continue to process the inner hole that has been rough milled until the fine boring head 9 passes through the inner hole of the cylinder head, and the processing of the inner hole of the cylinder head can be completed. The utility model integrates the rough boring head 6 and the fine boring head 9 on the same tool bar, and there is no need to replace the tool during the processing process, so that rough milling and fine milling can be completed at one time, which greatly improves the processing efficiency. Since the number and types of tool changes are reduced, the tool procurement and maintenance costs are reduced, thereby reducing the overall processing cost. In addition, since rough milling and fine milling are completed at one time, the errors caused by multiple clamping and tool replacement are reduced, and the processing accuracy is improved.

[0034] The upper cutter bar 1 and the lower cutter bar 2 of the utility model can be disassembled, so different lower cutter bars 2 can be selected for matching according to the model of the cylinder head, making the utility model more widely applicable.

[0035] Further, the first connection hole 3 and the second connection hole 4 are both square holes, the rough boring head 6 includes an upper horizontal surface 12 and a lower horizontal surface 13 that match the first connection hole 3, and the fine boring head 9 includes an upper horizontal surface 12 and a lower horizontal surface 13 that match the second connection hole 4. Since the upper horizontal surface 12 and the lower horizontal surface 13 of the rough boring head 6 and the fine boring head 9 are respectively matched with the two connection holes, when the rough boring head 6 and the fine boring head 9 are connected to the two connection holes, they can be directly pushed inward, so that their positioning is more accurate and no deviation occurs, thereby ensuring the processing quality during the subsequent cylinder head processing.

[0036] Furthermore, the two cutting edges 8 of the rough boring head 6 and the fine boring head 9 are both centrally symmetrically arranged. Specifically, the two cutting edges 8 of the rough boring head 6 and the fine boring head 9 are both centrally symmetrical, so that when the cutting edge 8 of the head needs to be replaced, it only needs to be horizontally flipped 180 degrees.

[0037] Furthermore, the lower cutter bar 2 includes a thin-diameter head 14, and the upper cutter bar 1 includes a fixing hole, and the thin-diameter head 14 is fixedly connected in the fixing hole by a screw and a nut 10. Specifically, the lower cutter bar 2 and the upper cutter bar 1 are fixed by a long screw 9 and a nut 10, and the fixing is faster and more convenient.

[0038] Furthermore, when processing the cylinder head, the exposed cutting edges 8 of the rough boring head 6 and the fine boring head are tilted downward by 2-5 degrees, specifically 5 degrees, and at the same time, the exposed cutting edges 8 of the rough boring head 6 and the fine boring head are tilted inward by 2-5 degrees, specifically also set to 5 degrees. The tilted design of the cutting edge 8 of the tool head of the utility model helps to optimize the cutting angle, reduce cutting resistance, improve cutting efficiency and surface quality, and at the same time, the design of the tilt angle makes the cutting force more reasonably distributed, reduces tool wear, and helps to extend the service life of the tool.

[0039] In addition, this inclination angle can achieve a smoother cutting process, reduce burrs and defects on the machined surface, and improve the surface quality of the workpiece. The downward and inward inclination design of the cutting edge 8 enhances the stability of the cutting process, reduces the vibration and jump of the tool during high-speed cutting, and improves the machining accuracy.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A cylinder head inner hole milling tool structure, characterized in that: include: A tool bar, the tool bar comprising an upper tool bar fixed in the machine tool, the upper tool bar being detachably connected to a lower tool bar, the lower tool bar being provided with a first connecting hole and a second connecting hole, the lower tool bar being further provided with a threaded hole penetrating the first connecting hole and the second connecting hole, the two threaded holes being respectively perpendicular to the first connecting hole and the second connecting hole; A rough boring head, the rough boring head is connected to the first connecting hole, a positioning hole is opened in the middle of the rough boring head, when the rough boring head is positioned and connected in the first connecting hole, it is positioned by a first screw, and the rough boring head includes two cutting edges; A fine boring head, the fine boring head is connected to the second connecting hole, a positioning hole is also opened in the middle of the fine boring head, when the fine boring head is positioned and connected to the second connecting hole, it is positioned by a second screw, and the fine boring head also includes two cutting edges; When the inner hole of the cylinder head is milled, the height of the cutting edge of the rough boring cutter head is lower than the height of the cutting edge of the fine boring cutter head.

2. A cylinder head inner hole milling tool structure as claimed in claim 1, characterized in that: The first connecting hole and the second connecting hole are both square holes, the rough boring head comprises an upper horizontal surface and a lower horizontal surface matching the first connecting hole, and the fine boring head comprises an upper horizontal surface and a lower horizontal surface matching the second connecting hole.

3. A cylinder head inner hole milling tool structure as claimed in claim 2, characterized in that: The two cutting edges of the rough boring tool head and the fine boring tool head are both centrally symmetrically arranged.

4. A cylinder head inner hole milling tool structure as claimed in claim 3, characterized in that: The lower cutter bar includes a thin-diameter head, and the upper cutter bar includes a fixing hole. The thin-diameter head is fixedly connected in the fixing hole by a screw and a nut.

5. A cylinder head inner hole milling tool structure as claimed in claim 4, characterized in that: When machining the cylinder head, the exposed cutting edges of the rough boring cutter head and the fine boring cutter head are inclined downward by 2-5 degrees, and at the same time, the exposed cutting edges of the rough boring cutter head and the fine boring cutter head are inclined inward by 2-5 degrees.

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