An integrated drill reamer tool

Abstract

The utility model discloses integrated drill reamer tool belongs to mechanical processing technical field. The tool includes the drill head structure of setting at the front end, and the reamer structure of integrated connection with drill head structure, and drill head structure includes 120 degree vertex angle and fine grinding cutting edge, realizes drilling, and the cutter tooth of reamer structure is along the uniform distribution of circumference, and cutting cone angle is 4, realizes reaming, and the axial distance of vertex angle of drill head structure and cutting cone part of reamer structure is no more than 10mm. The utility model discloses through the polishing of reamer and the reform, forms drill head, utilizes the integrity of drill head and reamer, guarantees the concentricity of pin hole and the size of aperture, thereby guarantees the distance size of pin hole hole distance. Realize pin hole integrated drill reamer processing, and drill head and reamer structure have higher coaxiality, guarantee the quality of pin hole, and the tool has guiding function simultaneously, can realize two kinds of processing mode of drill reamer once, need not secondary tool changing, saves production cost.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, specifically to an integrated drilling and reaming tool. Background Technology

[0002] In the field of mechanical manufacturing and machining, reaming is a common machining process, and it is usually found on the end face area of ​​the hull. Pin holes are generally divided into two types: blind holes and through holes. Ensuring the dimensional accuracy of both types simultaneously to guarantee the proper assembly of the product is crucial.

[0003] Current technical solution: The main method for machining pin holes in the end face area is to drill first and then ream. After drilling the pilot hole, a reaming die, a self-made guide sleeve, or a vertical drilling machine is used to assist in reaming. Manual assistance is used to reduce guiding deviations and to feed the reamer into the hole at the correct angle. This method has the following drawbacks: 1) Using a reaming die requires manufacturing a dedicated die for each product, resulting in high costs and the possibility of products waiting for the reaming die. 2) Using a self-made guide sleeve to control the reamer's direction generally requires two people. 3) The drilling machine-assisted reaming method is prone to hole diameter deviations, i.e., the stop end being exceeded during the inspection of the smooth plug gauge.

[0004] For example, in the machining of the cabin, pin holes are required. The existing machining method is a step-by-step machining process of first drilling the bottom hole and then reaming the hole. This method is prone to slight deviations between the datum of the second machining and that of the first machining. The tolerances for pin holes and their hole spacing are generally quite tight, which can easily lead to problems such as eccentricity between the reamed hole and the bottom hole, out-of-tolerance hole spacing, and out-of-tolerance dimensions of the hole opening (with a probability of 5%). Specific situations are as follows... Figure 1 As shown in the figure, A is the bottom hole and B is the reamed hole. The reason for the hole spacing being out of tolerance is that the direction of the reamed hole's eccentricity is uncertain. Therefore, the dimensional variation range of the hole spacing of 30 is 29.94-30.06, which exceeds the allowable tolerance range.

[0005] The reason for the large hole size is that the fitter used a conventional blind hole reamer, which typically has a front-end guide depth of only about 1-2 mm, resulting in poor guiding performance. During machining, the reamer is prone to skew, and this becomes more pronounced with increasing depth. See details... Figure 2 As shown, A is the pilot hole, B is the reaming hole, and C is the cutting tool. However, the guide length of the reamer for through holes is too long, which can interfere with the machining of some products. See details below. Figure 3 As shown.

[0006] To address the aforementioned problems, Chinese utility model patent CN2637064Y discloses a drill reamer, but its structure has gaps, making it unsuitable for high-precision dimensions; Chinese invention patent CN217727374U discloses an unequal-division roughing and finishing integrated reamer, but it does not have a drill bit and cannot complete the reaming process in one clamping; Chinese invention patent CN102407365A discloses a drill reamer, but its drill bit does not have a high-precision guiding function. Summary of the Invention

[0007] The purpose of this invention is to solve the problem of machining hull pin holes by using an integrated drilling and reaming tool to ensure product quality.

[0008] The technical solution of this utility model is as follows: An integrated drill and reamer tool, comprising a drill bit structure disposed at the front end and a reamer structure integrally connected to the drill bit structure. The drill bit structure includes a 120° apex angle and a finely ground cutting edge to achieve drilling; The cutting teeth of the reamer structure are evenly distributed along the circumference, and the cutting cone angle is 4°, thus achieving reaming; The axial distance between the apex of the drill bit structure and the cutting cone of the reamer structure is no greater than 10 mm.

[0009] Preferably, the other end of the reamer structure is also integrally connected with the cutter body and the cutter shank.

[0010] Preferably, the tool shank is a straight shank structure and is connected to the machine tool spindle.

[0011] Preferably, the cutting edge of the drill bit structure is sharp, with a test life of 150 holes and high wear resistance.

[0012] Preferably, the reamer structure includes six circumferentially distributed cutting teeth.

[0013] Preferably, the outer diameter of the drill bit structure is smaller than the outer diameter of the reamer structure.

[0014] The beneficial effects of this utility model are: 1. The traditional separate functions of drill bit and reamer are innovatively integrated into the same tool. By specially grinding and modifying the front end of the reamer, a front drill bit structure with drilling function and a rear reamer structure that retains reaming function are formed, realizing integrated drilling and reaming. The drill bit and reamer structure have a high degree of coaxiality, which ensures the quality of the pin hole.

[0015] 1. The cutting tool has a built-in guiding function, enabling both drilling and reaming in one operation without the need for a second tool change, thus saving production costs. The drill bit's guiding design, with the front end extending approximately 10mm, ensures that the tool processes along the bottom hole direction, guiding the subsequent reamer section and preventing pin hole misalignment and dimensional errors. It boasts strong versatility, high precision, and convenient operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the specific embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram showing hole eccentricity and hole spacing deviation. Figure 2 This is a schematic diagram illustrating machining where the reamer is skewed. Figure 3 Schematic diagram of interference during machining of excessively long guide for through-hole reamer; Figure 4 This is a schematic diagram of the integrated drill and reamer structure of this utility model; Reference numerals: 1-Tool shank; 2-Tool body; 3-Drill bit structure; 4-Reamer structure; A-Bottom hole; B-Reamer hole; C-Tool. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments. Any modifications, substitutions and alterations made based on ordinary technical knowledge and conventional means in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0019] The technical problem to be solved by this utility model is to use an integrated drilling and reaming tool to solve the problem of machining the hull pin hole and ensure product quality.

[0020] Structural Description This utility model provides an integrated drilling and reaming tool, such as Figure 4 As shown, the cutting tool consists of a tool shank 1, a tool body 2, a front-end drill structure 3, and a reamer structure 4. The tool shank 1 is used to connect to the machine tool spindle and adopts a standard straight shank structure to ensure reliable connection and power transmission with the machine tool; the tool body 2 is the middle connecting part of the cutting tool, which supports the front-end drill structure 3 and the reamer structure 4; the front-end drill structure 3 and the reamer structure 4 are the core parts for realizing integrated drilling and reaming.

[0021] Principle Explanation The front-end drill structure 3 is a modified version of the traditional reamer front end through special grinding. Its point angle is designed to be 120°, consistent with the point angle of a conventional twist drill, providing excellent centering and cutting efficiency. The cutting edge of the drill is finely ground, resulting in a sharp edge with high wear resistance, enabling it to quickly drill a pilot hole on the workpiece that meets the requirements for subsequent reaming.

[0022] Reamer structure 4 retains the basic characteristics of a traditional reamer, with cutting teeth evenly distributed along the circumference and a total of 6 teeth. The cutting cone angle is designed to be 4°, which can smoothly guide the reamer when it enters the bottom hole and reduce cutting resistance.

[0023] The drill bit and reamer have a very high degree of coaxiality, which can ensure that the bottom hole and the reamer are highly concentric, and the drill bit can also serve as a guide.

[0024] Action Relationship Explanation When machining pin holes, the shank 1 of the integrated drill-reamer is mounted on the spindle and positioned via the machine tool control system. After starting the drilling machine, the front drill bit 3 first drills the workpiece to create a pilot hole. Once the reamer part begins to contact the workpiece, the cutting parameters are adjusted, and the pilot hole is reamed using the reamer structure. Using a single tool to complete both drilling and reaming operations avoids positioning errors caused by multiple clamping operations, effectively improving the machining accuracy and production efficiency of the pin holes.

[0025] This cutting tool innovatively integrates the traditionally separate functions of a drill and a reamer into a single tool. Through special grinding and modification of the reamer's front end, it forms a front-end drill structure with drilling capabilities and a rear-end reamer structure retaining reaming functionality, achieving integrated drilling and reaming. The drill bit has a built-in guiding structure, improving reaming accuracy and preventing eccentricity or out-of-tolerance issues, without requiring reaming dies or other tools. Simultaneously, this tool simplifies the machining process for pin holes, improving machining efficiency and reducing costs.

[0026] The integrated drilling and reaming tool provided by this utility model has been described in detail above. Specific examples have been used to illustrate the structure and working principle of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the scope of protection of the claims of this utility model.

Claims

1. An integrated drilling and reaming tool, characterized in that: It includes a drill bit structure (3) set at the front end and a reamer structure (4) integrally connected with the drill bit structure (3). The drill bit structure (3) includes a 120° apex angle and a finely ground cutting edge to achieve drilling; The cutting teeth of the reamer structure (4) are evenly distributed along the circumference, and the cutting cone angle is 4°, so as to realize reaming; The axial distance between the apex of the drill bit structure (3) and the cutting cone of the reamer structure (4) is no greater than 10 mm.

2. The integrated drill and reamer according to claim 1, characterized in that: The other end of the reamer structure (4) is also integrally connected to the cutter body (2) and the cutter shank (1).

3. The integrated drill and reamer according to claim 2, characterized in that: The tool shank (1) is a straight shank structure and is connected to the machine tool spindle.

4. The integrated drill and reamer according to claim 1, characterized in that: The drill bit structure (3) has a sharp cutting edge with a test life of 150 holes and high wear resistance.

5. The integrated drill and reamer according to claim 1, characterized in that: The reamer structure (4) includes 6 circumferentially distributed cutting teeth.

6. The integrated drill and reamer according to claim 1, characterized in that: The outer diameter of the drill bit structure (3) is smaller than the outer diameter of the reamer structure (4).

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