Tapered hole precision broach

Abstract

The utility model provides a kind of conical hole precision cutter, including cutter bar and blade;The cutting edge of blade includes first cutting edge part, second cutting edge part, third cutting edge part;Cutter bar front end is provided with blade mounting portion, and blade mounting portion includes first vertebral body part, second vertebral body part and cylindrical portion;Blade groove is set in blade mounting portion, and blade is installed in blade groove, and its blade tip protrudes the front end surface of blade mounting portion, and the position of first cutting edge part corresponds with first vertebral body part, and the position of second cutting edge part, third cutting edge part and avoidance bevel corresponds with second vertebral body part.The utility model described precision cutter integrates conical hole reaming cutter and conical hole two-port chamfering cutter, realizes that conical hole reaming and two-port chamfering are carried out simultaneously, improves conical hole operation efficiency, and improves production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of cutting tools for machining, and in particular relates to a tapered hole fine scraping tool. Background Technology

[0002] In machining, workpieces have a wide variety of hole structures, many of which involve tapered holes and straight holes, such as... Figure 1 The hole structure shown includes a straight hole 4 and a tapered hole 5. The larger end of the tapered hole 5 is located on the end face of the workpiece. The smaller end of the tapered hole and the connection between the tapered hole and the straight hole 4 are chamfered at a right angle 6. The larger end of the tapered hole 5 is rounded at a rounded corner 7.

[0003] Currently, in the hole machining of this structure, due to the lack of integrated tools for simultaneously machining the conical hole 5, the right angle 6, and the large end chamfer of the conical hole, the machining of the conical hole 5, the right angle 6, and the rounded corner 7 are divided into three independent steps, each using three tools. First, the conical hole 5 is reamed using a reaming tool, then the right angle is reamed using a chamfering tool, and finally the rounded corner 7 is rounded using a rounded corner tool, resulting in low production efficiency. Utility Model Content

[0004] In view of this, the present invention aims to propose a tapered hole fine scraper, which can simultaneously enlarge the tapered hole in the workpiece, and chamfer the small end of the tapered hole and the connection position of the straight hole, as well as the large end of the tapered hole, thereby improving the work efficiency.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A tapered hole enlarging tool includes a cylindrical tool holder and a cutting tool for enlarging tapered holes;

[0007] The cutting edge of the blade includes a first cutting edge portion that is arranged sequentially from the tip to the rear to be chamfer the small end of the conical hole to be processed, a second cutting edge portion that enlarges the conical hole, and a third cutting edge portion that chamfers the large end of the conical hole. The length of the second cutting edge portion corresponds to the generatrix length of the conical hole to be processed. The blade is provided with a relief slope at the rear end of the third cutting edge portion to avoid the end face at the large end of the conical hole.

[0008] The front end of the tool holder is provided with a blade mounting part, which includes a first vertebral part, a second vertebral part, and a cylindrical part arranged sequentially from front to back;

[0009] The blade mounting part has a blade groove, and the blade is installed in the blade groove with its tip protruding from the front end face of the blade mounting part. The position of the first blade part corresponds to the position of the first vertebral body part and protrudes from the conical surface of the first vertebral body part. The positions of the second blade part, the third blade part and the avoidance slope are corresponding to the position of the second vertebral body part and all protrude from the conical surface of the second vertebral body part.

[0010] Furthermore, the third cutting edge is an arc-shaped cutting edge with rounded corners at the large end of the conical hole.

[0011] Furthermore, the blade groove includes a groove bottom surface, a first blade abutment surface, and a second blade abutment surface. A threaded hole is formed on the groove bottom surface. The first blade abutment surface and the second blade abutment surface are both perpendicular to the groove bottom surface. The first blade abutment surface is parallel to the center line of the tool holder. The second blade abutment surface is a bevel structure that intersects the first blade abutment surface at an obtuse angle.

[0012] The blade has only one tip. The blade lies in the blade groove and is close to the first blade surface and the second blade surface. The blade is locked and fixed by screws. The end of the blade away from the first blade surface protrudes from the outer edge of the blade groove.

[0013] Furthermore, the plane containing the rake face of the blade passes through the center of the tool shank.

[0014] Furthermore, a first hole is formed at the center of the front end face of the tool holder, and a second hole is formed near the rear end of the tool holder, with the second hole and the first hole communicating with each other.

[0015] Furthermore, the second hole is an oblique hole structure with the inner port facing forward.

[0016] Furthermore, the tool holder is integrally formed at the rear end of the tool holder. The tool holder has a cylindrical structure with an axially formed limiting groove on its outer circumferential surface, which extends out of the rear end face of the tool holder.

[0017] Furthermore, a positioning ring groove is formed on the outer circumferential surface of the tool holder near the rear end.

[0018] Compared with the prior art, the tapered hole fine scraper of this utility model has the following advantages:

[0019] (1) The precision cutter of this utility model integrates a tapered hole enlarging cutter and a tapered hole chamfering cutter at both ends, so as to realize the tapered hole enlarging itself and the tapered hole chamfering at both ends at the same time, thereby improving the tapered hole operation efficiency and production efficiency.

[0020] (2) In this utility model, the cutting edge of the blade and the end of the blade away from the first blade protrude from the blade groove, so that the cutting edge and the end of the blade away from the first blade and the circumferential surface of the tool holder can form a chip removal channel, through which the chips generated during processing are discharged.

[0021] (3) In this utility model, the first hole and the second hole can form a ventilation channel, which is beneficial to the cooling of the tool, that is, to the cooling of the blade.

[0022] (4) In this utility model, the upper limit groove and positioning ring groove of the tool holder facilitate the insertion and positioning of this utility model and drilling equipment, thereby improving the installation efficiency of this tool. Attached Figure Description

[0023] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0024] Figure 1 This is a schematic diagram of the internal hole structure of the workpiece;

[0025] Figure 2 This is a schematic diagram of a tapered hole fine scraper according to an embodiment of the present utility model;

[0026] Figure 3 for Figure 2 AA view;

[0027] Figure 4 This is a schematic diagram of the blade groove structure in an embodiment of the present utility model;

[0028] Figure 5 for Figure 1 BB view;

[0029] Explanation of reference numerals in the attached figures:

[0030] 1-Tool holder; 11-First hole; 12-Second hole; 13-Insert groove; 131-Groove bottom surface; 132-First insert abutment surface; 133-Second insert abutment surface; 14-Insert mounting part; 141-First cone part; 142-Second cone part; 143-Cylindrical part; 2-Insert; 21-First cutting edge part; 22-Second cutting edge part; 23-Third cutting edge part; 24-Insert tip; 25-Allowing part; 26-Front face; 27-Main flank face; 3-Tool shank; 31-Positioning ring groove; 32-Limiting groove; 4-Straight hole; 5-Conical hole; 6-Chamfered right angle; 7-Rounded corner. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] like Figure 2 , Figure 3 As shown, a tapered bore enlarging tool includes a cylindrical tool shank 1. A blade mounting portion 14 is provided at the front end of the tool shank 1 for mounting a blade 2 for enlarging tapered bores. A tool holder 3 is integrally formed at the rear end of the tool shank 1. The blade mounting portion 14 includes a first conical portion 141, a second conical portion 142, and a cylindrical portion 143 arranged sequentially from front to back. Four blade slots 13 are evenly formed in the circumferential direction of the blade mounting portion 14, and a blade 2 is installed in each blade slot 13. The tip 24 of the blade 2 protrudes from the front end face of the blade mounting portion 14, which is also the front end face of the tool shank 1.

[0033] The blade groove 13 structure is as follows Figure 4As shown, it includes a groove bottom surface 131, a first blade abutment surface 132, and a second blade abutment surface 133. The groove bottom surface 131 is a planar structure with a threaded hole. The first blade abutment surface 132 and the second blade abutment surface 133 are both perpendicular to the groove bottom surface 131. The first blade abutment surface 132 is parallel to the center line of the tool holder 1. The second blade abutment surface 133 is a sloping structure that intersects the first blade abutment surface 132 at an obtuse angle.

[0034] The shape of the blade 2 corresponds to the blade groove 13. The blade 2 is provided with only one cutting tip 24. The cutting edge of the blade 2 includes a first cutting edge 21, a second cutting edge 22 and a third cutting edge 23 arranged sequentially from the cutting tip 24. The first cutting edge 21 and the second cutting edge 22 are both straight cutting edges, and the length of the second cutting edge 22 corresponds to the generatrix length of the tapered hole to be processed. This structure can achieve the processing of right angle, tapered hole enlargement and tapered hole chamfering at the large end of the tapered hole with a single tool, thereby improving the hole processing efficiency.

[0035] The blade 2 rests in the blade groove 13 and is close to the first blade abutment surface 132 and the second blade abutment surface 133. The tip 24 of the blade 2 protrudes from the front end face of the blade mounting part 14, which is also the front end face of the blade shank 1. The position of the first cutting edge 21 corresponds to the first cone body 141. The positions of the second cutting edge 22, the third cutting edge 23 and the avoidance slope 25 correspond to the second cone body 142. The blade 2 is locked and fixed with screws. The end of the blade 2 away from the first blade abutment surface 132 protrudes from the outer edge of the blade groove 13, which is the end of the blade 2 away from the first blade abutment surface 132 protrudes from the circumferential surface of the blade mounting part 14. The main back cutting surface 27 corresponding to the first cutting edge 21 protrudes from the conical surface of the first cone body 141. The main back cutting surface 27 and the avoidance slope 25 corresponding to the second cutting edge 22 and the third cutting edge 23 both protrude from the conical surface of the second cone body 142. After installation, both the first cutting edge 21 and the second cutting edge 22 form an acute angle with the centerline of the tool holder 1. The size of this acute angle depends on the state of the taper hole being machined. For example, when the right angle 6 is a 45° right angle structure, the angle between the first cutting edge 21 and the centerline of the tool holder 1 after the insert 2 is installed is 45°. When the apex angle of the taper hole 5 is 30°, the angle between the second cutting edge 22 and the centerline of the tool holder 1 is 15°. The third cutting edge 23 is used to chamfer the large end of the taper hole 5. For example, when the chamfer of the large end of the taper hole 5 is a rounded corner 7, the third cutting edge 23 is a corresponding arc-shaped cutting edge. Furthermore, the radial positions of the first cutting edge 21, the second cutting edge 22, and the third cutting edge 23 relative to the center of the tool holder must ensure that when the tool holder 1 rotates, the first cutting edge 21 can complete the machining of the right angle 6, the second cutting edge 22 can perform hole enlargement machining on the taper hole 5, and the third cutting edge 23 can complete the machining of the rounded corner 7. To avoid interference between the blade 2 and the end face at the large end of the tapered hole during the above operations, the blade 2 is provided with a relief slope 25 at the rear end of the third cutting edge 23 to avoid the end face at the large end of the tapered hole.

[0036] In this invention, the plane containing the rake face 26 of the blade 2 passes through the center of the tool holder 1, which improves the stability of the hole processed by the tool.

[0037] In this invention, a first hole 11 is formed at the center of the front end face of the tool holder 1, and a second hole 12 is formed near the rear end of the tool holder 1. The second hole 12 and the first hole 11 are connected to form a ventilation channel, which is beneficial for cooling the tool body, i.e., for cooling the blade. Preferably, the second hole 12 is an oblique hole structure with the inner end facing forward.

[0038] In this utility model, the knife handle 3 is also a cylindrical structure, and a limiting groove 32 is axially formed on its outer circumferential surface, such as... Figure 4 , Figure 5 As shown, the limiting groove 32 extends beyond the rear end face of the tool holder 3. When the tool is loaded onto the tool holder provided by the equipment, the limiting groove 32 and the corresponding limiting block on the tool holder assemble to limit the circumferential movement of the tool and prevent it from rotating relative to the tool holder. Additionally, a positioning ring groove 31 is formed on the outer circumferential surface of the tool holder 3 near the rear end. The positioning ring groove 31 assembles with a top block on the tool holder to limit the depth of insertion of the tool into the tool holder, facilitating the operator's loading of the tool into the tool holder.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A conical hole gauging cutter characterized by: It includes a cylindrical tool holder (1) and a cutting tool (2) for expanding the tapered hole; The blade (2) includes a first blade part (21) for chamfering the small end of the conical hole to be processed, arranged sequentially from the tip (24) to the rear, a second blade part (22) for enlarging the conical hole, and a third blade part (23) for chamfering the large end of the conical hole. The length of the second blade part (22) corresponds to the generatrix length of the conical hole to be processed. The blade (2) has a relief slope (25) at the rear end of the third blade part (23) to avoid the end face of the large end of the conical hole. The blade holder (1) has a blade mounting part (14) at its front end. The blade mounting part (14) includes a first vertebral part (141), a second vertebral part (142), and a cylindrical part (143) arranged sequentially from front to back. The blade mounting part (14) has a blade groove (13), and the blade (2) is installed in the blade groove (13). Its blade tip (24) protrudes from the front end face of the blade mounting part (14). The position of the first blade part (21) corresponds to the position of the first vertebral part (141) and protrudes from the conical surface of the first vertebral part (141). The positions of the second blade part (22), the third blade part (23) and the avoidance slope (25) correspond to the position of the second vertebral part (142) and all protrude from the conical surface of the second vertebral part (142).

2. The conical bore punch according to claim 1, characterized in that: The third cutting edge (23) is an arc-shaped cutting edge with rounded corners at the large end of the conical hole.

3. The conical bore punch according to claim 1, wherein: The blade groove (13) includes a groove bottom surface (131), a first blade abutment surface (132), and a second blade abutment surface (133). A threaded hole is provided on the groove bottom surface (131). The first blade abutment surface (132) and the second blade abutment surface (133) are both perpendicular to the groove bottom surface (131). The first blade abutment surface (132) is parallel to the center line of the tool holder (1). The second blade abutment surface (133) is a sloping surface structure that intersects the first blade abutment surface (132) at an obtuse angle. The blade (2) has only one tip (24). The blade (2) lies in the blade groove (13) and is close to the first blade surface (132) and the second blade surface (133). The blade (2) is locked and fixed by screws. The end of the blade (2) that is away from the first blade surface (132) protrudes out of the outer edge of the blade groove (13).

4. The conical bore punch according to claim 1, wherein: The plane containing the rake face (26) of the blade (2) passes through the center of the tool holder (1).

5. The conical bore punch according to claim 1, wherein: The tool holder (1) has a first hole (11) at the center of its front end face and a second hole (12) near its rear end. The second hole (12) and the first hole (11) are connected.

6. A conical hole cutting tool according to claim 5, characterized in that: The second hole (12) is an oblique hole structure with the inner port facing forward.

7. The conical bore punch according to claim 1, wherein: The tool holder (1) has an integrally formed tool handle (3) at its rear end. The tool handle (3) is a cylindrical structure with a limiting groove (32) axially formed on its outer circumferential surface. The limiting groove (32) extends out of the rear end face of the tool handle (3).

8. The conical bore punch according to claim 7, characterized in that: The tool holder (3) has a positioning ring groove (31) on its outer circumference near the rear end.

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