Device for machining inclined taper hole through numerical control lathe

Abstract

The utility model relates to a device for machining an inclined taper hole through a numerical control lathe, and belongs to the technical field of machining. Comprising a clamp body and a self-made boring cutter clamp. The clamp body comprises a clamp body, two first screws and two gaskets. An inclined hole is formed in the middle of the clamp body, the inclined hole is composed of an upper inclined step hole and a lower inclined step hole which are different in diameter, screw holes are formed in the two ends of the inclined hole, a part is placed in the inclined hole of the clamp body, the two gaskets and the two first screws are screwed into the positions, corresponding to the screw holes, of the clamp body together, and the two first screws are screwed tightly. The boring cutter clamp comprises a boring cutter rod, second screws and an alloy boring cutter, the boring cutter clamp is characterized in that a hole is firstly machined in the boring cutter rod, and the alloy boring cutter is inserted into the hole and fastened through the two second screws. The tool is simple in structure, convenient to disassemble, high in positioning accuracy, economical and practical, adopts a turning procedure to replace a milling procedure of a machining center, can complete machining at a time, and is high in production efficiency.

Description

Technical Field

[0001] This utility model relates to a device for machining tapered holes on a CNC lathe, belonging to the field of mechanical processing technology. Background Technology

[0002] Machining oblique holes is a common problem in machining. Common machining processes include using a three-axis machining center with a dedicated fixture, or using a five-axis machining center for angled milling. Existing methods for machining oblique tapered holes on special-purpose parts employ interpolation milling, requiring flipping the parts for machining on both sides. Furthermore, the cutting depth is affected by surface finish; the milling depth cannot be too large, and the cutting density cannot be too loose, easily resulting in poor surface finish and low production efficiency. Therefore, this invention proposes a device for machining oblique tapered holes on a CNC lathe. Utility Model Content

[0003] The purpose of this invention is to solve a series of problems in existing tapered hole machining, such as poor surface finish of parts, limited milling depth, and low production efficiency, and to provide a dedicated device for machining tapered holes on a CNC lathe.

[0004] The purpose of this utility model is achieved through the following technical solution.

[0005] This utility model proposes a device for machining oblique tapered holes on a CNC lathe, including a fixture and a self-made boring tool fixture.

[0006] The clamping device includes: a clamping body, two first screws, and two washers. A slanted hole is formed in the middle of the clamping body, consisting of two inclined stepped holes of different diameters, with the smaller diameter step hole at the lower end serving as the inner hole of the second step. The centerline of the slanted hole forms a 20-degree angle with the axis of the main shaft. Screw holes are formed at both ends of the slanted hole, with the axis of the screw holes also forming a 20-degree angle with the axis of the main shaft.

[0007] Place the part into the inclined hole of the clamp body, screw the two washers and the two first screws into the corresponding screw holes of the clamp body and tighten the two first screws. The two washers are stuck on the edge of the upper surface of the part to better fix the part.

[0008] The upper edge of the clamp body has a discharge groove for easy loading and unloading of parts.

[0009] The boring tool fixture includes a boring bar, a second screw, and an alloy boring tool.

[0010] The boring tool fixture has a hole machined on the boring tool holder at a 15-degree angle to the axis of the boring tool holder. The alloy boring tool is inserted into this hole and secured with two second screws.

[0011] The angle between the centerline of the inclined hole of the fixture and the axis of the spindle, as well as the angle between the alloy boring tool and the boring bar, can be adjusted according to the machining requirements of the inclined tapered hole of the part being machined.

[0012] Working principle

[0013] On a CNC lathe, a self-centering hydraulic soft jaw with a pre-bored inner hole is used to clamp the fixture body. The rear end face of the fixture body fits against the end face of the self-centering chuck soft jaw on the lathe to ensure the coaxiality of the rotation center of the fixture body and the rotation center of the soft jaw. The semi-finished part is placed into the inclined hole of the fixture body. The two inclined stepped holes correspond to the stepped shafts of the part's shape. After the part and the fixture body are assembled, the depth of the second step inner hole of the fixture body should be greater than the length of the part. When the boring tool is turning the inner hole, it will not turn onto the fixture body, which also serves to make way. Then, the shim and screw are screwed into the corresponding threaded hole position of the fixture body. The shim is stuck on the edge of the upper surface of the part and is tightened by the screw to fix the part. Then, the machining begins. First, a pre-drilled through hole is drilled; then, the inner cavity on the right end is machined using a regular boring tool; finally, the inner cavity on the left end of the part is machined using the self-made boring tool fixture of this patent. When disassembling after processing, loosen the two fastening screws and remove the processed part from the unloading chute. Repeat the above steps when processing again.

[0014] Beneficial effects

[0015] This patent has a simple structure, is easy to disassemble, has high positioning accuracy, is economical and practical. It uses a turning process to replace the milling process of a machining center and can complete the process in one go, resulting in high production efficiency and overcoming the problem of high processing costs for similar parts. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the fixture body and parts assembly of this utility model;

[0017] Figure 2 This is a schematic diagram of the self-made boring tool fixture of this utility model;

[0018] Figure 3 This is a schematic diagram of the clamp body of this utility model;

[0019] Figure 4 Schematic diagram of semi-finished parts;

[0020] Figure 5 Part diagram;

[0021] Figure 6 This is a schematic diagram of the clamping screw of this utility model;

[0022] Figure 7 This is a schematic diagram of the clamping gasket of this utility model;

[0023] Figure 8This is a schematic diagram of a boring bar;

[0024] Figure 9 This is a schematic diagram of the boring tool clamp screw;

[0025] Figure 10 This is a schematic diagram of an alloy boring tool;

[0026] Figure 11 This is a schematic diagram of the machining process for a tapered hole.

[0027] The numbers in the diagram are: 1-clamp body, 2-part, 3-first screw, 4-washer, 5-carbide boring bar, 6-second screw, 7-boring bar shank. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0029] Example

[0030] Combination Figures 1-10 This utility model proposes a device for machining oblique tapered holes on a CNC lathe, including a fixture and a self-made boring tool fixture at a certain angle to the horizontal direction.

[0031] The clamping device includes: a clamping body 1 (including a positioning surface), two first screws 3, and two washers 4. A slanted hole is formed in the middle of the clamping body, consisting of two inclined stepped holes of different diameters, with the smaller-diameter stepped hole serving as the inner hole of the second step. The centerline of the slanted hole forms a 20-degree angle with the spindle axis. The center distance between the two screw holes is 48 mm, and the axis of the screw holes also forms a 20-degree angle with the spindle axis. This 20-degree angle is the angle between the inner hole of the part and the axis.

[0032] The inclined hole has screw holes at both ends. The part is placed into the inclined hole of the clamping body, and the two washers 4 and the two first screws 3 are screwed into the corresponding screw holes of the clamping body and the two first screws 3 are tightened. The two washers 4 are stuck on the edge of the upper surface of the part to better fix the part.

[0033] The upper edge of the clamp body has a discharge groove for easy loading and unloading of parts.

[0034] The boring tool fixture includes a boring bar 7, a second screw 6, and an alloy boring tool 5.

[0035] The boring tool fixture has a 6mm hole machined in the boring tool holder 7 at a 15-degree angle to the axis of the boring tool holder. The alloy boring tool 5 is inserted into this hole and secured with two second screws 6. This 15-degree angle is the angle formed between the left end cavity of the part and the spindle after the part and fixture are assembled.

[0036] The angle between the centerline of the inclined hole of the fixture and the axis of the spindle, as well as the angle between the alloy boring tool 5 and the boring tool shank 7, can be adjusted according to the machining requirements of the inclined tapered hole of the part being machined.

[0037] Working principle

[0038] On a CNC lathe, a self-centering hydraulic soft jaw with a pre-bored inner hole is used to clamp the fixture body. The rear end face of the fixture body is in contact with the end face of the soft jaw of the lathe's self-centering chuck to ensure the coaxiality of the rotation center of the fixture body and the rotation center of the soft jaw. The semi-finished part is placed into the inclined hole of the fixture body. The two inclined stepped holes correspond to the stepped shafts of the part's shape. After the part and the fixture body are assembled, the depth of the second step inner hole of the fixture body should be greater than the length of the part. When the boring tool is used to machine the inner hole, it will not cut into the fixture body, thus also serving a clearance function. Then, the shim 4 and the first screw 3 are screwed into the corresponding threaded hole of the fixture body. The shim 4 is clamped onto the edge of the upper surface of the part, and the part is fixed by tightening with the screw. Then, machining begins, such as... Figure 11 As shown, first, a pre-drilled through hole is drilled; then, the inner cavity on the right end is machined using a regular boring tool; finally, the inner cavity on the left end of the part is machined using a combination boring tool. When disassembling after machining, loosen the two first screws 3 and remove the machined part from the unloading groove. Repeat the above steps for subsequent machining.

[0039] In summary, the turning machining method of this invention can achieve the machining of the left and right cavities in a single setup. By replacing interpolation milling with machining center machining, this method solves the problems of high machining costs and low efficiency associated with machining similar parts using three-axis or five-axis machining centers.

Claims

1. A device for machining tapered holes on a CNC lathe, characterized in that: The fixture includes a clamping body and a self-made boring tool fixture. The clamping body includes: a clamping body body, two first screws, and two washers. The clamping body body has an oblique hole in the middle for placing the part. The oblique hole is composed of two inclined stepped holes with different diameters, one at the bottom and one at the top. The lower stepped hole with a smaller diameter is the inner hole of the second step. The center line of the oblique hole forms a 20-degree angle with the axis of the spindle. Screw holes are opened at both ends of the oblique hole. The axis of the screw holes also forms a 20-degree angle with the axis of the spindle. First screws are respectively installed in the screw holes. The two washers are respectively placed between the first screws and the screw holes, ensuring that the two washers are engaged with the edge of the upper surface of the part. The boring tool fixture includes a boring bar, a second screw, and an alloy boring tool. The boring bar has a hole at a 15-degree angle to its axis. The alloy boring tool is placed in this hole. The boring bar and the alloy boring tool are fastened together by two second screws. The angle between the centerline of the inclined hole of the fixture and the axis of the spindle, as well as the angle between the alloy boring tool and the boring bar, can be adjusted according to the machining requirements of the inclined tapered hole of the workpiece.

2. The apparatus for machining tapered holes on a CNC lathe as described in claim 1, characterized in that: The upper edge of the clamp body has a discharge groove for easy loading and unloading of parts.

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