Rotary tool for turning automobile starter rotor

Abstract

A kind of automobile starter rotor paper cutter, including fixed seat, slide is equipped on fixed seat, cutter bar seat is equipped on the side of fixed seat, slide block is equipped on the side of cutter bar seat corresponding fixed seat, slide block is inserted in the slide by sliding fit, pressure spring is equipped in the slide behind slide block;Rectangular recess is equipped in cutter bar seat;Cutter bar is embedded and fixed in rectangular recess, two ladder-shaped sliding grooves of upper and lower symmetrical arrangement and mutual intercommunication are equipped in the front end of cutter bar, two sliding grooves are respectively outer wide and narrow upper sliding groove and lower sliding groove, tool bit is equipped in upper sliding groove by sliding fit, lock nut is equipped in lower sliding groove, tool bit is fixed with lock nut by screw through the center hole, for fixing tool bit in upper sliding groove;The front end of the cutter bar is arc surface, the front end of tool bit protrudes the arc surface of the front end of cutter bar, and the protruding length is equivalent to the thickness of the insulating paper wrapped on the surface of rotor iron core.This cutter can quickly break the insulating paper, and the working efficiency is high.

Description

Technical Field

[0001] This utility model relates to a type of machining tool, and more particularly to a paper cutting tool for an automobile starter rotor. Background Technology

[0002] The manufacturing process of an automotive starter rotor involves first completely wrapping the iron core with insulating paper, then winding the wire, followed by sequential steps including pressing the commutator, inserting copper wire into slots, applying varnish, machining, and dynamic balancing to produce the finished product. The purpose of applying varnish is to fix the copper wire and make the surface of the iron core smoother after machining.

[0003] Currently, during the coating process, the insulating paper covering the iron core prevents the paint from penetrating. Therefore, the rotor needs to be fixed on a lathe, and the insulating paper needs to be machined through the middle of the iron core or divided into several sections to allow the insulating paint to enter the iron core through these openings. However, due to manufacturing errors in the rotor core, there is a certain degree of eccentricity when rotating on the lathe. To machine through the insulating paper in one go, the cutting tool may hit the iron core in areas of significant eccentricity, creating a deep groove on the outer edge of the core. Even after subsequent machining of the iron core surface, this groove may still exist, rendering the rotor defective and reducing the yield rate.

[0004] Authorization announcement number CN221135465U discloses a grinding paper cutter for an automotive starter rotor, including a fixed base, a slide rail on the fixed base, a cutter holder on one side of the fixed base, and a slider on the cutter holder corresponding to one side of the fixed base. The slider is slidably inserted into the slide rail. A pressure spring is provided behind the slider in the slide rail to press the slider against the front end of the slide rail. A rectangular groove is provided in the cutter holder, and a pad and an oilstone strip are provided in the rectangular groove. Multiple set screws are provided on the other side of the cutter holder, and the set screws press against the pad to fix the oilstone strip.

[0005] This type of paper-grinding tool works by using an oilstone strip to contact the outer edge of the iron core until the insulating paper is worn through. If the oilstone grit is too high, it won't be able to grind through the paper; if the grit is too low, although it can remove the insulating paper, the grinding time is long and it causes significant damage to the iron core. Therefore, this type of paper-grinding tool is difficult to grind through the insulating paper quickly and effectively, resulting in low work efficiency. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a car starter rotor paper cutting tool that can quickly tear insulating paper and has high working efficiency.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A rotary paper cutter for an automotive starter motor includes a fixed base, a slide rail on the fixed base, a cutter bar seat on one side of the fixed base, and a slider on the cutter bar seat corresponding to the side of the fixed base. The slider is slidably inserted into the slide rail. A pressure spring is provided behind the slider in the slide rail to press the slider against the front end of the slide rail. A rectangular groove is provided in the cutter bar seat. Its special feature is:

[0009] A cutter bar is embedded and fixed in a rectangular groove. Two stepped slide grooves are provided at the front end of the cutter bar and are symmetrically arranged and connected to each other. The two slide grooves are an upper slide groove and a lower slide groove, which are wider on the outside and narrower on the inside. A cutter head is provided in the upper slide groove through sliding fit. A lock nut is provided in the lower slide groove. The cutter head is fixed to the lock nut by a screw that passes through its central hole, which is used to fix the cutter head in the upper slide groove.

[0010] The front end of the cutter bar is an arc surface, and the front end of the cutter head protrudes beyond the arc surface of the front end of the cutter bar, with the protrusion length being equivalent to the thickness of the insulating paper wrapped on the surface of the rotor core.

[0011] As a further preferred option, a right-angled groove is provided at the front end of the blade on the side of the blade head to avoid paper burrs after paper cutting, thus preventing the paper burrs from pushing open the blade during use.

[0012] As a further preferred option, multiple set screws are provided on the other side of the tool holder, one of which is locked at the rear end of the tool holder to achieve front and rear limit of the tool holder; the remaining set screws abut against the tool holder to fix the tool holder.

[0013] As a further preferred embodiment, a central hole is provided on the slider, and a top post is provided in the central hole through clearance fit. The front end of the pressure spring is inserted into the central hole and abuts against the rear end of the top post. An adjusting screw is threadedly connected to the front part of the central hole, and the inner end of the adjusting screw abuts against the front end of the top post to adjust the preload of the pressure spring.

[0014] As a further preferred embodiment, a front baffle and a rear baffle are fixed on the fixed base at both ends of the slide, respectively. The rear end of the pressure spring rests on the rear baffle to achieve sliding limit of the tool holder. A through hole is provided on the front baffle at the corresponding center hole to facilitate adjustment of the adjusting screw.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. Because there are two stepped slide grooves arranged symmetrically and interconnected at the front end of the cutter bar, and the cutter head is provided in the upper slide groove through sliding fit, the cutter head is fixed to the lock nut in the lower slide groove by the screw passing through its central hole. Therefore, the cutter head can be fixed in the upper slide groove and the position of the cutter head can be adjusted so as to adjust the length of the arc surface of the cutter head protruding from the front end of the cutter bar, so that the protruding length of the cutter head is equivalent to the thickness of the insulating paper wrapped on the surface of the rotor iron core, thereby enabling the insulating paper to be quickly broken and the working efficiency is high.

[0017] 2. Because a pressure spring is provided behind the slider in the slide rail on the fixed seat, which is used to press the slider against the front end of the slide rail; therefore, when the cutter bar is subjected to force, it can automatically retract backward and always contact the outer edge of the rotor core under the action of the pressure spring, which can prevent the cutter head from machining a deep groove on the eccentric outer edge of the core, thus improving the yield. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 yes Figure 1 The left view.

[0020] Figure 3 yes Figure 2 AA sectional view.

[0021] Figure 4 yes Figure 1 Top view.

[0022] Figure 5 This is a three-dimensional structural diagram of the present invention.

[0023] In the diagram: 1. Tool holder, 2. Tool holder, 201. Upper sliding groove, 202. Lower sliding groove, 203. Right angle groove, 3. Set screw, 4. Lock nut, 5. Front baffle, 501. Through hole, 6. Adjusting screw, 7. Slider, 8. Fixed base, 801. Rear baffle, 9. Pressure spring, 10. Top column, 11. Tool head, 12. Screw, 13. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] like Figure 1-5 As shown, the present invention relates to a car starter rotor paper cutter, including a rectangular fixed seat 8. A slide rail 801 is provided along the longitudinal direction on one side of the fixed seat 8. The slide rail 801 has a rectangular cross-section and a retaining edge at the outer end of its inner top surface. A knife bar seat 1 is provided on one side of the fixed seat 8. The knife bar seat 1 is also rectangular in shape. An integral slider 7 is provided on the knife bar seat 1 corresponding to one side of the fixed seat 8. The top surface of the slider 7 has a retaining groove that mates with the retaining edge and is inserted into the slide rail 801 through a sliding gap.

[0026] A pressure spring 10 is provided behind the slider 7 within the slide rail 801 to press the slider 7 against the front end of the slide rail 801. A front baffle 5 and a rear baffle 9 are fixed to the fixed base 8 at both ends of the slide rail 801 by screws. The rear end of the pressure spring 10 presses against the inner end of the rear baffle 9, and the slider 7, under the action of the pressure spring 10, presses against the inner end of the front baffle 5, thus achieving sliding limit of the tool holder 1. The sliding clearance of the slider 7 within the slide rail 801 is 5mm.

[0027] A central hole is provided along the longitudinal direction of the slider 7. A top post 11 is inserted into the central hole through a clearance fit. The front end of the pressure spring 10 is inserted into the central hole and abuts against the rear end of the top post 11. An adjusting screw 6 is threadedly connected to the front part of the central hole on the slider 7. The inner end of the adjusting screw 6 abuts against the front end of the top post 11 to adjust the preload of the pressure spring 10. A through hole is provided on the front baffle 5 corresponding to the central hole of the slider 7 to facilitate the rotation of the adjusting screw 6.

[0028] A rectangular groove 101 is provided longitudinally within the tool holder 1. A tool holder 2 is embedded and fixed within the rectangular groove 101. Two stepped sliding grooves are symmetrically arranged and interconnected at the front center of the tool holder 2. The two sliding grooves are an upper sliding groove 201 (wider on the outside, narrower on the inside) and a lower sliding groove 202 (narrower on the inside). A tool head 12 is inserted into the upper sliding groove through a sliding fit. A lock nut 4 is provided in the lower sliding groove. The tool head 12 is fixed to the lock nut 4 by an internal hexagon screw 13 passing through its central hole, thus fixing the tool head 12 within the upper sliding groove. The tool head 12 is rhomboid in shape and made of cemented carbide.

[0029] The front end of the cutter bar 2 is an arc surface, and the front end of the cutter head 12 protrudes beyond the arc surface of the front end of the cutter bar 2, with the protrusion length being approximately equal to the thickness of the insulating paper wrapped on the surface of the rotor core. A right-angled groove 203 is provided on the side of the blade of the cutter head 12 at the front end of the cutter bar 2 to avoid paper burrs after paper cutting, thus preventing the paper burrs from pushing open the cutter bar 2 during use.

[0030] On the other side of the tool holder 1, there are multiple set screws 3. In this embodiment, four set screws are used as an example. One set screw 3 near the rear end of the tool holder is locked at the rear end of the tool holder 2 to realize the front and rear limit of the tool holder 2, so as to facilitate the quick replacement of the tool holder 2. The remaining set screws 3 abut against the tool holder 2 to fix the tool holder 2.

[0031] In use, mount the fixing seat 8 onto the lathe tool post, and clamp the car starter rotor onto the lathe chuck. Start the lathe and align the tool shank 2 with the car starter rotor, then feed it until the arc surface at the front end of the tool shank 2 touches the outer edge of the rotor, then feed it another 1-2 mm. At this point, the cutting tip of the cutter head 12 has already torn the insulating paper. Then, engage the lathe's automatic feed mechanism. As the workpiece rotates, the arc surface of the tool shank 2 contacts the workpiece, and the cutter head 12 is pressed against the insulating paper by the pressure spring. As the rotor moves back and forth with eccentricity, the cutting tip only tears the paper without touching the iron core. After automatic feed of 2-3 mm, stop the feed and retract the tool.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A paper cutter for an automotive starter rotor, comprising a fixed base, a slide rail on the fixed base, a cutter bar seat on one side of the fixed base, and a slider on the cutter bar seat corresponding to one side of the fixed base. The slider is slidably fitted into the slide rail, and a pressure spring is provided behind the slider within the slide rail to press the slider against the front end of the slide rail; a rectangular groove is provided within the cutter bar seat; characterized in that: A cutter bar is embedded and fixed in a rectangular groove. Two stepped slide grooves are provided at the front end of the cutter bar and are symmetrically arranged and connected to each other. The two slide grooves are an upper slide groove and a lower slide groove, which are wider on the outside and narrower on the inside. A cutter head is provided in the upper slide groove through sliding fit. A lock nut is provided in the lower slide groove. The cutter head is fixed to the lock nut by a screw that passes through its central hole, which is used to fix the cutter head in the upper slide groove. The front end of the cutter bar is an arc surface, and the front end of the cutter head protrudes beyond the arc surface of the front end of the cutter bar, with the protrusion length being equivalent to the thickness of the insulating paper wrapped on the surface of the rotor core.

2. The automotive starter rotor paper cutter according to claim 1, characterized in that: in The front end of the blade holder has a right-angled groove on one side of the blade tip to avoid paper burrs after paper cutting.

3. The automotive starter rotor paper cutter according to claim 1, characterized in that: in The other side of the tool holder is provided with multiple set screws. One set screw is locked at the rear end of the tool holder to achieve front and rear limit of the tool holder; the remaining set screws abut against the tool holder to fix the tool holder.

4. The automotive starter rotor paper cutter according to claim 1, characterized in that: A central hole is provided on the slider, and a top post is provided in the central hole through clearance fit. The front end of the pressure spring is inserted into the central hole and abuts against the rear end of the top post. An adjusting screw is threadedly connected to the front part of the central hole, and the inner end of the adjusting screw abuts against the front end of the top post to adjust the preload of the pressure spring.

5. The automotive starter rotor paper cutter according to claim 4, characterized in that: A front baffle and a rear baffle are fixed on the fixed base at both ends of the slide rail, respectively. The rear end of the pressure spring rests on the rear baffle to achieve the sliding limit of the tool holder. A through hole is provided on the front baffle at the center hole to facilitate the adjustment screw.

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