Special rear-mounted boring cutter assembly for long guide deep stepped hole

Abstract

The utility model discloses a special boring cutter assembly for a rear-mounted long-guide deep stepped hole, which comprises a stepped cutter head and a coaxial rough boring cutter head, and the stepped cutter head comprises a small-diameter section, a large-diameter section and a connecting section; a guide groove is formed in the outer diameter of the large-diameter section, and a guide block is fixed in the guide groove; a large-diameter boring cutter is arranged on the large-diameter section; a small-diameter boring cutter is arranged on the small-diameter section; the coaxial heavy boring tool bit is fixed on the guide rod; when a forged pipe material is machined, rough machining of a large-diameter hole in a stepped hole is achieved through the stepped tool bit, after machining is completed, the coaxial rough boring tool bit and the guide rod are guided to go deep together with the inner wall of the large-diameter hole, and in the process, the inner wall of the large-diameter hole and the inner wall of the large-diameter hole are matched with the inner wall of the large-diameter hole. The outer diameter of the guide rod and the guide block is matched with the large diameter of the stepped hole for guiding, the coaxial rough boring tool bit only carries out rough machining on a small-diameter hole, and the stepped hole obtained through the tool set and the machining technology is good in coaxiality and high in precision and is particularly suitable for machining of forged pipe materials.

Description

Technical Field

[0001] The utility model belongs to the technical field of deep step hole processing, and in particular relates to a special boring cutter assembly for a rear-mounted long-guide deep step hole and a processing technology thereof. Background Art

[0002] As known in the art, existing deep step holes can be summarized into two processing situations:

[0003] First, for the working condition where the workpiece is a solid bar, ordinary deep-hole tools can be used for machining by butt drilling and boring. This machining method will result in low coaxiality accuracy of the step hole. Through technical innovation, technical personnel in this field have creatively used a "special boring head for front guide of step hole" for machining. This machining method is to first machine the small hole of the step hole for guidance, and then use the front guide method to machine the large hole of the step hole. This method can ensure the coaxiality accuracy of the step hole;

[0004] Second, for forging pipes with a pre-existing stepped inner hole, the current processing method is to use butt boring with a common deep-hole boring head. However, the coaxiality accuracy of the stepped hole obtained by this processing method is low. The aforementioned "special boring head for pre-guided stepped holes" can only be used for solid bars because it requires a pilot hole to be machined first. Therefore, it is not applicable to forging pipes.

[0005] In view of the above-mentioned drawbacks, as technical personnel in this industry, how to design a special boring tool assembly for deep step holes in forging pipe working conditions, which can realize coaxial processing and ensure the accuracy of coaxial processing, is a technical problem that needs to be solved urgently by technical personnel in this field. Summary of the Invention

[0006] In order to overcome the shortcomings of the existing technology, the utility model provides a special boring tool assembly for rear-mounted long-guide deep step holes and discloses its processing technology. It uses two sets of tools in combination to ensure the coaxiality of deep hole processing under forging pipe conditions.

[0007] To achieve the above technical objectives, the present invention adopts the following scheme: a rear-mounted long-guide deep step hole special boring tool assembly, which includes a step tool head and a coaxial rough boring tool head, the step tool head including a small diameter section, a large diameter section, and a connecting section; a guide groove is provided on the outer diameter of the large diameter section, and a guide block is fixed in the guide groove; a large diameter boring tool is provided on the large diameter section, and a large diameter guide block is provided in conjunction with the large diameter boring tool; a small diameter boring tool is provided on the small diameter section, and a small diameter guide block is provided in conjunction with the small diameter boring tool;

[0008] The coaxial rough boring cutter head is fixed on the guide rod, the coaxial rough boring cutter is designed with equal diameter, a guide groove is arranged on the outer diameter of the coaxial rough boring cutter, and a guide block is fixed in the guide groove.

[0009] The guide groove is arranged in an inclined mode, a threaded hole is arranged at the bottom of the guide groove, the guide block is arranged in a wedge mode, a long groove is arranged on the upper portion of the guide block and corresponds to the guide groove, and the axial offset adjustment of the guide block is realized through the long groove.

[0010] The large-diameter boring cutter and the small-diameter boring cutter are arranged in the same plane, and the large-diameter boring cutter and the small-diameter boring cutter are arranged in front of and behind each other in the axial direction.

[0011] The guide rod is provided with a guide rod guide groove, and a guide rod guide block is fixed in the guide rod guide groove.

[0012] The guide rod is a tool rod, and the inner diameter of the guide rod is hollow and used as a cutting guide groove or a chip liquid supply groove.

[0013] The utility model discloses a beneficial effect is: the utility model discloses a step cutter head and coaxial rough boring cutter head through above setting, the step cutter head includes fine diameter section and coarse diameter section and connecting section, the outer diameter of coarse diameter section is provided with guide groove, and guide block is fixed in the guide groove, the coarse diameter section is provided with large -diameter boring cutter, and the fine diameter section is provided with small -diameter boring cutter, the coaxial rough boring cutter head is fixed on the guide rod, the coaxial rough boring cutter head is provided with rough boring cutter, when forging pipe material processing, first realizes the rough machining of large -diameter hole in step hole through step cutter head, after processing, with the inner wall of large -diameter hole as the guide, the coaxial rough boring cutter head is deepened together with the guide rod, in this process, the outer diameter of guide rod guide block is matched with the large -diameter of step hole and is used as the guide, and the coaxial rough boring cutter head only carries out the rough machining of small -diameter hole, and the coaxiality of step hole obtained through above tool set and processing technology is good, and the precision is high, especially suitable for forging pipe material processing, and is an ideal post -position long -guide deep step hole special boring cutter assembly. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a step cutter head main view structure schematic drawing;

[0015] Figure 2 It is a step cutter head side view structure schematic drawing;

[0016] Figure 3 It is a coaxial rough boring cutter head main view structure schematic drawing;

[0017] Figure 4 It is a coaxial rough boring cutter head installation structure schematic drawing;

[0018] Figure 5 It is a forging pipe material processing structure schematic drawing.

[0019] In the drawings, 1, step cutter head, 11, coarse diameter section, 12, fine diameter section, 13, guide groove, 14, guide block, 15, blade fixing groove, 16, connecting section, 2, coaxial coarse boring cutter head, 20, threaded connection end, 21, coarse boring cutter, 22, coarse boring guide block, 3, small diameter boring cutter, 4, large diameter boring cutter, 5, small diameter guide block, 6, large diameter guide block, 7, guide block, 71, long slot, 8, guide rod, 81, shaft hole, 82, guide rod guide groove, 83, guide rod guide block, 84, threaded section. DETAILED DESCRIPTION

[0020] As shown in the drawings, the utility model discloses a kind of boring cutter assembly specially used for rear long guide deep step hole, the specific structure of the boring cutter assembly specially used for rear long guide deep step hole is shown in detail in this embodiment, while the use method is explained through specific embodiment, the technical solution of the person skilled in the art can be implemented or further made technical extension on the basis of the technical solution, the protection scope of the utility model is as claimed in claim book.

[0021] Example 1:

[0022] A kind of boring cutter assembly specially used for rear long guide deep step hole, as Figures 1 to 4 Shown, it includes step cutter head 1 and coaxial coarse boring cutter head 2.The step cutter head 1 is used to process large diameter hole and the end of small diameter hole, and the coaxial coarse boring cutter head 2 is used to realize the processing of small diameter hole.

[0023] As Figure 1 , 2 Shown, the step cutter head 1 includes fine diameter section 12 and coarse diameter section 11 and connecting section 15, the connecting section is used to and external cutter bar thread connection fixed;The outer diameter of the coarse diameter section 11 is provided with guide groove 13, the guide groove 13 is inclinedly arranged, and the bottom of guide groove 13 is provided with threaded hole, the guide groove 13 is fixed with guide block 7, the guide block 7 is wedge-shaped arrangement, and the upper portion of the guide block 7 is provided with long slot 71 corresponding to guide groove 13, the axial offset adjustment of guide block 7 is realized by long slot, so that different outer diameter guide sizes are obtained.

[0024] The outer diameter of the coarse diameter section 11 is provided with large diameter boring cutter 4, and large diameter guide block 6 is arranged around the coarse diameter section 11 in cooperation with large diameter boring cutter 4;Under normal circumstances, the large diameter guide block 6 is three, which realizes the four equal division of the coarse diameter section 11 in cooperation with the large diameter boring cutter 4, and the outer diameter of the large diameter guide block 6 is equal to the tip of the large diameter boring cutter 4.

[0025] The small-diameter boring cutter 3 is arranged on the small-diameter section 12, and a small-diameter guide block 5 is arranged on the periphery of the small-diameter section 12 in cooperation with the small-diameter boring cutter 3; generally, the small-diameter guide block 5 is two, which cooperates with the small-diameter boring cutter 3 to realize three equal divisions of the small-diameter section 12, and the outer diameter of the small-diameter guide block 5 is equal to the cutting edge of the small-diameter boring cutter 3.

[0026] Furthermore, the large-diameter boring cutter 4 and the small-diameter boring cutter 3 are arranged in the same plane, and the large-diameter boring cutter 4 and the small-diameter boring cutter 3 are arranged axially in front of and behind each other.

[0027] As shown in Figure 3 , 4 , the coaxial rough boring cutter head 2 is fixed on the guide rod 8, the coaxial rough boring cutter 2 is designed to be equal in diameter, which is similar to the stepped cutter head 1 in that a guide groove 13 is arranged on the outer diameter, and a guide block 14 is fixed in the guide groove 13; the coaxial rough boring cutter head 2 is provided with a rough boring cutter 21 and a rough boring guide block 22. The end of the coaxial rough boring cutter head 2 is also provided with a threaded connection end 20, and the guide rod 8 is fixed integrally.

[0028] Further, the guide rod guide groove 82 is arranged on the guide rod 8, and the guide rod guide block 83 is fixed in the guide rod guide groove 82, and the outer diameter of the guide rod guide block 83 in this area cooperates with the large diameter of the stepped hole. Because the guide rod guide groove 82, the guide rod guide block 83, the guide groove 13 on the stepped cutter head 1 and the guide block 7 have the same structure and function, details are not described here.

[0029] Further, the guide rod 8 is a cutter rod, and the inner diameter is hollow to form an axial hole 81 as a cutting guide groove or a chip liquid supply groove.

[0030] Embodiment 2:

[0031] On the basis of the structure disclosed in embodiment 1, the utility model also discloses a machining process for machining the stepped hole as shown in Figure 5 , and the specific steps are as follows:

[0032] 1. First, use the ordinary deep hole boring head to bore the stepped hole in the centering manner, and the small-diameter hole of the stepped hole is bored with a diameter allowance of 2-3 mm, and the large-diameter hole is bored with a diameter allowance of 0.5-1 mm;

[0033] 2. Use the stepped cutter head 1 with limited size (the large hole and the small hole have an allowance of 0.2-0.5 mm) to bore the large hole of the stepped hole, and at the same time, a guide hole with a depth of about 30-50 mm (determined according to the distance between the two boring cutters on the stepped rough boring head) is bored for the small hole of the stepped hole;

[0034] 3. Using the customized size coaxial rough boring cutter 2 combined with the rear guide rod 8, the guide rod 8 is slightly longer than the length of the small diameter hole, and the large diameter hole is guided to send the coaxial rough boring cutter 2 into the 50mm deep small diameter hole and to bore;

[0035] 4. Finally, use the flat bottom boring head to finish the large diameter hole end of the step hole, and use the matched processing method to float the large diameter hole and the small diameter hole of the step hole to the required size to ensure the size accuracy and smoothness of the step hole. This process method of using the step cutter head 1 combined with the coaxial rough boring cutter 2 and the rear guide rod 8 can ensure the consistency of the coaxiality of the step hole of the forged pipe material.

[0036] In the above processing process, the step cutter head 1, the two boring cutter diameters are different and maintain a certain distance, the two small diameter guide blocks 5 on the cutter body are made of hard alloy guide keys for guiding, and the three large diameter guide blocks 6 are uniformly distributed behind, the large diameter guide blocks 6 are made of soft rubber wood for shock absorption. The distance from the rough boring guide block 22 of the guide rod 8 close to the cutter to the top end of the rough boring cutter 21 is slightly longer than the length of the small diameter hole of the step hole, so as to avoid the rough boring guide block 22 of the rear long guide rod colliding with the bottom of the large diameter hole of the step hole before the small diameter hole of the step hole is not finished, and to affect the cutter feeding.

Claims

1. A special boring tool assembly for rear-mounted long guide deep step holes, characterized by: It includes a step tool head and a coaxial rough boring tool head. The step tool head includes a small diameter section, a large diameter section and a connecting section. The outer diameter of the large diameter section is provided with a guide groove, and a guide block is fixed in the guide groove. The large diameter section is provided with a large diameter boring tool, and a large diameter guide block is provided to match the large diameter boring tool. The small diameter section is provided with a small diameter boring tool, and a small diameter guide block is provided to match the small diameter boring tool. The coaxial rough boring cutter head is fixed on the guide rod. The coaxial rough boring cutter is designed with equal diameters and a guide groove is provided on its outer diameter. A guide block is fixed in the guide groove. The coaxial rough boring cutter head is provided with a rough boring cutter and a rough boring guide block.

2. A rear-mounted long guide deep step hole special boring tool assembly according to claim 1, characterized in that: The guide groove is inclined, a threaded hole is provided at the bottom of the guide groove, the guide block is wedge-shaped, and a long groove is provided on its upper portion corresponding to the guide groove, and the axial offset adjustment of the guide block is achieved through the long groove.

3. The rear-mounted long guide deep step hole special boring tool assembly according to claim 1, characterized in that: The large-diameter boring tool and the small-diameter boring tool are arranged on the same plane, and the large-diameter boring tool and the small-diameter boring tool are arranged front to back in the axial direction.

4. A rear-mounted long guide deep step hole special boring tool assembly as claimed in claim 1, characterized in that: The guide rod is provided with a guide rod guide groove, a guide rod guide block is fixed in the guide rod guide groove, and the outer diameter of the guide rod guide block matches the major diameter of the step hole.

5. The rear-mounted long guide deep step hole special boring tool assembly according to claim 1, characterized in that: The guide rod is a tool rod, and its inner diameter is hollow and serves as a cutting guide groove or a chip fluid supply groove.

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