Small frame counter bore machining tool

Abstract

The utility model discloses a small frame counter bore machining tool, which relates to the field of machining and comprises an angular electric drill, a drill plate, a cushion block, a measuring cylinder and a limit sleeve. Drilling guide holes and positioning guide holes are formed in the drill plate, the hole center distance of the guide holes is consistent with that of the counter bores, the hole diameter of the drilling guide holes is consistent with that of the counter bores, and the hole diameter of the positioning guide holes is consistent with that of the screw through holes. The drill plate is placed in a counter bore in the inner side of the small frame. The cushion blocks are placed in counter bores in the outer sides of the small frames. Installation through holes are formed in the center of the drill plate and the center of the cushion block, and the drill plate, the small frame and the cushion block can be connected into a whole through bolts. The limiting sleeve is placed between the drill plate and the angular electric drill and used for controlling the machining depth of the counter bore, and the measuring cylinder is placed in the machined counter bore. The machining tool is simple and easy to operate, machining on a machine tool is not needed, and the situation that the frame deforms when counter bores of the frame are reversely pulled on the machine tool is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of machining, especially a small frame counterbore machining tool. BACKGROUND

[0002] O or U frame is a common part in the turntable product. The frame part usually has a counterbore structure. The so-called counterbore is a counterbore inside the part, which cannot be directly machined by machine tool.

[0003] Generally, we often use a shaped counterbore tool or a self-made adjustable counterbore tool to machine the counterbore of a large frame. Alternatively, we use a right-angle milling head to machine the counterbore from the inside of the part. However, for small frame parts, the counterbore diameter is small, the through hole diameter is about φ3.2-φ4.5, and the counterbore diameter is about φ6-φ8. If a counterbore tool is used for machining, the tool shank is thin and has poor rigidity, and the counterbore is easy to break during pulling. At the same time, the wall thickness of the small frame is small, and the rigidity is not good, which can easily cause deformation of the part during pulling. For the machining method using a right-angle milling head, the inner cavity size is smaller due to the small size of the frame, and there is usually no suitable right-angle milling head. Customizing a small right-angle milling head is expensive, and the cost of machining single or small batch parts is high. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a small frame counterbore machining tool, which can clamp and position the small frame and machine the counterbore by using an angular electric drill, a drill template, a cushion block, a measuring cylinder, and a limiting sleeve, thereby preventing the drill from deviating during machining, preventing the drill from breaking, and preventing the frame from deforming.

[0005] A small frame counterbore machining tool includes an angular electric drill, a limiting sleeve, a drill template, a cushion block, a measuring cylinder, and a screw. The drill template is placed in the counterbore inside the small frame to guide the machining of the counterbore of the small frame. The cushion block is placed outside the small frame to fix the drill template and the small frame. The angular electric drill is arranged on one side of the small frame. The limiting sleeve is placed between the angular electric drill and the drill template to control the depth of the counterbore and ensure that the depths of the counterbores are consistent. The measuring cylinder is placed in the machined counterbore to measure the depth of the counterbore.

[0006] Further, the size of the drill template is smaller than the counterbore inside the small frame, and the drill template is placed in the counterbore inside the small frame. A group of positioning guide holes and drill guide holes are arranged on the drill template, and a mounting through hole is arranged at the center position. The positions of the positioning guide holes and the drill guide holes are consistent with the positions of the counterbores. The diameter of the drill guide hole is the same as the diameter of the counterbore. The diameter of the positioning guide hole is consistent with the diameter of the screw through hole.

[0007] Further, the gasket is a stepped cylindrical type, the small end diameter of the gasket is smaller than the outer side counterbore of the small frame, and the small end length of the gasket is longer than the depth of the outer side counterbore of the small frame; the large diameter of the large end of the gasket increases the positioning area and improves the stability during machining; the center of the gasket is provided with a mounting screw hole, and the drill template is fastened through the mounting through hole of the drill template and the mounting screw hole in the middle of the gasket, so that the drill template and the small frame are connected into one body, thereby facilitating the machining of the counterbore.

[0008] Further, the length of the group of drilling guide holes on the drill template is 2-3 times the diameter of the counterbore, so as to play a guiding role and prevent the drill bit from deflecting during drilling.

[0009] Further, the middle of the limiting sleeve is provided with a through hole and a chip pocket, the diameter of the through hole is the same as that of the drill bit, the chip pocket is used to accommodate the cutting chips generated during the machining of the counterbore, and the limiting sleeve is made of polytetrafluoroethylene material.

[0010] The utility model has the advantages that (1) the tooling provided by the utility model is simple and easy to operate, and does not need to be machined on a machine tool; (2) the utility model avoids the phenomenon that the frame is broken or deformed when the counterbore is machined; (3) the tool is simple and easy to manufacture; and (4) the processing cost is low, and the efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a structural exploded view of the utility model.

[0012] Figure 2 It is a machining view of the utility model.

[0013] Figure 3 It is a small frame partial cutting view of the utility model.

[0014] Figure 4 It is a counterbore size view of the small frame of the utility model.

[0015] Figure 5 It is a drill template view of the utility model.

[0016] Figure 6 It is a counterbore measurement view of the utility model.

[0017] Corresponding reference signs: 1-angulartilt electric drill; 2-limiting sleeve; 21-through hole; 22-chip pocket; 3-drill template; 31-positioning guide hole; 32-mounting through hole; 33-drilling guide hole; 4-gasket; 41-mounting screw hole; 5-measuring cylinder; 6-screw; 7-small frame; 71-counterbore; 72-screw through hole. DETAILED DESCRIPTION

[0018] The utility model will be further described below in conjunction with specific embodiments, the illustrative embodiments of the utility model and the description are used to explain the utility model, but not as the limitation of the utility model.

[0019] Embodiment: as Figures 1-6 The utility model discloses a small frame reverse counterbore processing frock, including angular electric drill 1, spacing sleeve 2, drill template 3, backing plate 4, measuring cylinder 5 and screw 6, drill template 3 is placed in the counterbore inside small frame 7, is used to the processing guide of small frame 7 reverse counterbore 71.

[0020] Drill template 3 size is slightly smaller than the counterbore inside small frame 7, and is placed in the counterbore inside small frame 7, is provided with positioning guide hole 31 and drilling guide hole 33 thereon, the hole center distance of guide hole is consistent with reverse counterbore 71, and the hole diameter of drilling guide hole is consistent with the hole diameter of reverse counterbore 71, and the hole diameter of positioning guide hole is consistent with the diameter of screw through hole 72.

[0021] Backing plate 4 is the stepped cylinder type, and the small end diameter size is slightly smaller than the counterbore outside small frame 7, and is placed in the counterbore outside small frame 7, and the small end length size should be slightly longer than the depth of the counterbore outside small frame 7.

[0022] The large end of backing plate 4 should select larger diameter, increase the positioning area, improve the stability when processing, and the mounting screw hole 41 is arranged at the center position of backing plate 4.

[0023] The length of a group of drilling guide holes 33 on drill template 3 should be appropriate, about 2-3 times of the hole diameter of reverse counterbore 71, can play a better guiding role, prevent the drill bit deflection when drilling.

[0024] Spacing sleeve 2 is provided with through hole 21 and chip pocket 22 in the middle. The hole diameter of through hole 21 is same with the diameter of drill bit. The hole diameter and depth of chip pocket 22 should be appropriate, to ensure that the cutting chips generated when processing reverse counterbore 71 can be accommodated; the material of spacing sleeve 2 is polytetrafluoroethylene or other plastic materials, the plasticity of such materials is good, can be better coated on the drill bit, and meanwhile, the damage of drill template caused by reverse counterbore processing can also be avoided.

[0025] The working principle of this utility model:

[0026] like Figure 4 As shown, in this embodiment, the countersunk hole 71 has a diameter of φ6.5 mm and a depth of 5 mm, and the screw through hole 72 has a diameter of φ3.2 mm. The machining process should ensure that the length of the φ3.2 mm hole is 2.8 ± 0.1 mm. The machining process is as follows:

[0027] (1) Prepare two φ3.2 ordinary twist drill bits, one φ6.5 ordinary twist drill bit, and then manually grind a φ6.5 flat bottom drill bit.

[0028] (2) Insert the φ6.5 ordinary twist drill bit into the chuck of the angular electric drill.

[0029] (3) The end of the limiting sleeve 2 with the chip accumulation hole 22 is the lower end. Put the limiting sleeve 2 on the φ6.5 drill bit, with the upper end close to the end face of the drill chuck of the angled electric drill. After adjusting the drill tip to extend slightly less than 23mm beyond the lower end face of the limiting sleeve 2 (5mm depth of the countersunk hole 71 + 18mm thickness of the drill template), lock the drill chuck to secure the drill bit.

[0030] (4) Place the drill template 3 into the countersunk hole inside the small frame 7, and insert two φ3.2 drill bits into the positioning guide hole 31 of the drill template 3 and the φ3.2 screw hole of the small frame 7 to complete the positioning of the drill template.

[0031] (5) Place the pad 4 into the countersunk hole on the outside of the small frame 7, pass the screw 6 through the mounting hole 32 in the middle of the drill template 3 and tighten it in the mounting screw hole 41 in the middle of the pad 4, and place the large end face of the pad 4 on the flat plate.

[0032] (6) Pass the φ6.5 ordinary drill bit through the drill guide hole 33 of the drill template 3, and drill the countersunk hole vertically with the angle electric drill 1 until the lower end of the limit sleeve 2 is close to the drill template 3.

[0033] (7) Machin the remaining countersunk holes 71 in sequence.

[0034] (8) Remove the φ6.5 ordinary drill bit and replace it with a φ6.5 flat bottom drill bit.

[0035] (9) Place the limiting sleeve 2 on the φ6.5 flat bottom drill bit, with the upper end close to the end face of the drill chuck of the angled electric drill. After adjusting the drill tip to extend 23mm beyond the lower end face of the limiting sleeve 2 (5mm depth of the countersunk hole 71 + 18mm thickness of the drill template), lock the drill chuck to secure the drill bit.

[0036] (10) Pass the φ6.5 flat bottom drill bit through the drill guide hole 33 of the drill template 3, and drill the countersunk hole vertically with the angle electric drill 1 until the lower end of the limit sleeve 2 is close to the drill template 3.

[0037] (11) Remove the drill jig plate 3, put the measuring cylinder 5 into the reverse sink hole 71, and measure the relevant dimensions as shown in the attached Figure 6 L is the distance between the upper end surface of the measuring cylinder 5 and the lower end surface of the pad 4, a is the length of the measuring cylinder 5, b is the thickness of the pad, and the value of L-a-b is the length dimension of the φ3.2 screw hole 72, which is 2.8±0.1mm for qualification.

[0038] (12) After the first hole measurement is qualified, reinstall the drill jig plate and process the remaining reverse sink holes 71.

Claims

1. A small frame counterbore processing tool, comprising an angular electric drill (1), a limiting sleeve (2), a drill template (3), a backing plate (4), a measuring cylinder (5) and a screw (6), characterized in that, The drill template (3) is placed in the counterbore inside the small frame (7) for guiding the counterbore (71) of the small frame (7), the backing plate (4) is placed outside the small frame (7) for fixing the drill template (3) and the small frame (7), the angular electric drill (1) is arranged on one side of the small frame (7), the limiting sleeve (2) is placed between the angular electric drill (1) and the drill template (3) for controlling the drilling depth size of the counterbore (71) and the consistency of the depth of each counterbore (71), and the measuring cylinder (5) is placed in the processed counterbore (71) for measuring the related depth size of the counterbore (71).

2. The small frame counterbore machining tool of claim 1, wherein, The drill template (3) is smaller than the counterbore inside the small frame (7) and is placed in the counterbore inside the small frame (7), a group of positioning guide holes (31) and drilling guide holes (33) are arranged on the drill template (3), and a mounting through hole (32) is arranged at the center position, the positions of the positioning guide holes (31) and the drilling guide holes (33) are consistent with the position of the counterbore (71), the diameter of the drilling guide hole (33) is the same as the diameter of the counterbore (71), and the diameter of the positioning guide hole (31) is consistent with the diameter of the screw through hole (72).

3. The small frame counterbore machining tool of claim 1, wherein, The backing plate (4) is a stepped cylinder, the small end diameter of the backing plate (4) is smaller than the counterbore outside the small frame (7) and is placed in the counterbore outside the small frame (7), and the length of the small end of the backing plate (4) is longer than the depth of the counterbore outside the small frame (7); the large diameter of the large end of the backing plate (4) increases the positioning area and improves the stability during processing; a mounting screw hole (41) is arranged at the center position of the backing plate (4), the drill template (3) and the small frame (7) are fastened by screws (6) through the mounting through hole (32) of the drill template (3) and the mounting screw hole (41) in the middle of the backing plate (4) to be integrated, so as to facilitate the processing of the counterbore (71).

4. The small frame counterbore machining tool of claim 2, wherein, The length of the group of drilling guide holes (33) on the drill template (3) is 2-3 times the aperture of the counterbore (71) to play a guiding role and prevent the drill bit from deflecting during drilling.

5. The compact frame counterbore machining tool of claim 1, wherein, The limiting sleeve (2) is made of polytetrafluoroethylene material.

Images