CN101708562A - Equipment and process for manufacturing burglarproof bolt L-shaped groove - Google Patents

Abstract

The invention relates to equipment and technology for making L-shaped grooves of anti-theft bolts. The method mainly solves the problems in the prior art that the processing of the L-shaped groove damages the thread, the qualified rate of the L-shaped groove is low, and the problems of inconvenient operation. It is characterized in that: the tooling (21) mainly includes a fixed fixture (1), a movable fixture (3) and a collet (2), the tooling (21) is placed on the milling machine (18), and the clamping The middle part of the head (2) is clamped by a threaded bolt (17). The equipment used for making the L-shaped groove of the anti-theft bolt has the characteristics of convenient operation, no damage to the screw thread, and a high qualified rate of processing the L-shaped groove, and the labor intensity of workers can be reduced by adopting the process.

Description

A kind of equipment and process used for making anti-theft bolt L-shaped groove

Technical field:

The invention relates to the field of mechanical manufacturing, in particular to equipment and a process for making L-shaped grooves of anti-theft bolts.

Background technique:

The bolt is a fastener with a wide range of applications. As long as the corresponding nut is screwed in, the object to be fastened can be clamped. It is very convenient to use, but in the process of use, sometimes it is unsafe due to artificial disassembly. factors and even accidents. In order to solve this problem, we invented a kind of anti-theft bolt, which has an L-shaped groove. It is too big and easy to damage the thread. We have also tried to place a plate under the bolt, but there is nowhere for the iron filings to be discharged. After a long time, it will easily affect the levelness of the bolt, resulting in a low pass rate of L-shaped groove processing. At the same time, there is no custom-made processing technology for the L-shaped groove, and there is no standard for workers to operate, resulting in low production efficiency.

Invention content:

In order to overcome the above-mentioned deficiencies in the tools used for processing the L-shaped grooves of anti-theft bolts in the prior art, the present invention provides a kind of equipment and technology used for making L-shaped grooves of anti-theft bolts. The characteristics of high efficiency, the use of this processing technology can improve production efficiency and reduce labor intensity of workers.

The technical solution of the present invention is: a kind of equipment used for making anti-theft bolt L-shaped groove, including tooling, milling machine, described tooling mainly includes fixed fixture and movable fixture and collet, fixed fixture and movable fixture respectively fix collet The left and right halves, the middle part of the chuck is a threaded hole, and there is a gap between the left and right halves. The left half is aligned up and down, and the lower part of the right half is symmetrical to the left half. The width of the upper slot corresponds to the threaded hole in the middle. The difference between the long sides of the L-shaped groove on the anti-theft bolt is a positive number, and there is a threaded hole in the middle of the chuck for fixing; the fixed fixture is connected to the movable fixture through a guide shaft, and the movable fixture is connected to the feeding device. The bottom of the fixed fixture and the movable fixture are inclined to both sides, there is a slide rail between the movable fixture and the bottom plate, and the part of the guide shaft between the fixed fixture and the movable fixture has a limited boss; The tool is installed on the milling machine, and the middle part of the chuck is threaded to clamp the bolt.

The left and right halves of the chuck together are 50-70mm long, 40-55mm wide and 25-40mm high.

A process for making L-shaped grooves for anti-theft bolts, characterized in that it comprises the following steps:

①. Select the collet of the corresponding specification and install it on the L-shaped groove of the fixture, and then install the end mill on the milling cutter fixture;

②. Put the bolt in the collet. If it is a single nut bolt, the end of the thread should be level with the collet. The double nut bolt should leave a nut distance as required, and also place it at the same position as the collet. The milling machine with the milling cutter installed is adjusted at a distance of 5-20 mm from the thread surface of the bolt, and the drill rod is pressed down to the thread surface to check whether the left side of the milling cutter is aligned with the thread center. After clamping, return the milling cutter to the end of the thread, and put down the drill The position of the rod to the small diameter of the thread;

③. Adjust the speed of the milling machine between 1000-1500 rpm. Check whether the speed is normal. Turn the handwheel to push the workbench and tooling forward slowly until the position in step ② (that is, the single nut and bolt should connect the end of the thread with the clip. The heads are flat, and the double nuts and bolts are required to leave a nut distance) to stop, reverse the workbench and the tooling together, stop at 5-20mm from the end of the thread, loosen the chuck and take out the bolts, and check whether they meet the requirements. Require.

④. Check whether the radial depth of the L-shaped groove is qualified;

⑤. Check whether the length B of the long side is twice the length A of the short side;

⑥. Trial process several bolts, adjust the position of the milling cutter properly and lock it, and start normal processing;

⑦. Deburring: It can be completed by manual rotary die advance and retreat method and pneumatic rotary advance and retreat method.

The present invention has the following beneficial effects: due to the adoption of the above scheme, the collets are respectively fixed on the movable fixture and the fixed fixture, and the bolt can be clamped by moving the movable fixture through the feeding device, which is convenient to operate; The matching threaded holes make the threads on the bolts not damaged; the left and right halves of the chuck and the right half of the slot corresponding to the L-shaped groove make it easy to locate and align the bolts, which can be operated with the naked eye of the worker. Using this process to process L-shaped grooves reduces the labor intensity of workers and improves the processing pass rate.

Description of drawings:

Accompanying drawing 1 is a structural representation of the present invention;

Accompanying drawing 2 is the structural representation of manual clamping tool;

Accompanying drawing 3 is the structure diagram of collet.

In the figure 1-fixed fixture, 2-collet, 3-movable fixture, 4-screw, 5-nut, 6-cylinder, 7-pedal valve, 8-cylinder seat, 9-guide shaft, 10-bottom plate, 11 -Large nut, 12-Lead screw, 13-Hand wheel, 14-Handle, 15-Feed device, 16-Slide rail, 17-Bolt, 18-Milling machine, 19-Milling cutter, 20-Milling machine guide rail, 21-Tooling , 22 - milling machine.

Detailed ways:

The present invention is described in detail below in conjunction with accompanying drawing:

Shown in Fig. 1, Fig. 2, Fig. 3, a kind of used equipment of making antitheft bolt L-shaped groove comprises frock 21, milling machine 18, and frock 21 is placed on milling machine guide rail 20, can move on milling machine guide rail 20. The tooling mainly includes a fixed fixture 1, a movable fixture 3, and a collet 2. The collet 2 is divided into left and right halves, which are respectively placed on the fixed fixture 1 and the movable fixture 2. The middle part of the collet 2 is a threaded hole. There is a gap between the left and right halves. The left half is aligned up and down, and the lower part of the right half is symmetrical to the left half. The difference between the width of the upper slot and the long side of the L-shaped slot on the bolt corresponding to the threaded hole in the middle is a positive number, that is, the right The width of the half top groove will be greater than the length of the long side of the L-shaped groove on the anti-theft bolt. The threaded hole in the middle of the chuck 2 depends on the size of the bolt, generally M12-27 (M30 clamped on the bench vise), the left and right halves of the chuck 2 are 50-70mm long, 40-55mm wide, and 25mm high -40mm, the width of the upper notch is 5-13mm when the half is broken, to ensure that the tool will not touch the chuck 15, the upper notch is 1-3mm to the left along the center line, and 4-10mm to the right along the center line; the width of the lower notch is 2- 6mm, divided into two parts along the center line, that is, the left and right sides along the center line are 1-3mm respectively. The above values are determined by the specifications of the processed anti-theft bolt 17. Generally speaking, the larger the diameter of the bolt 17, the greater the above values . The chuck 2 can be welded on the fixed fixture 1 and the movable fixture 3, but considering the convenience of maintenance, the preferred solution is to process a threaded hole horizontally in the middle of the chuck 2, and fix it with the clamps (1, 3) with bolts.

The fixed fixture 1 and the movable fixture 3 are connected through the guide shaft 9, which is a sliding fit between the guide shaft 9 and the movable fixture 3, and is fixed with the fixed fixture 1, and the part of the guide shaft 9 between the fixed fixture 1 and the movable fixture 3 The limited boss prevents the collet 2 from clamping the bolt too tightly. The movable clamp 3 is connected with the feeding device 15, and the feeding device 15 can be pneumatic feeding or manual feeding, which will be described in detail below. As a preference, the bottom of the fixed fixture 1 and the movable fixture 3 are inclined to both sides to ensure smoother discharge of iron filings. As a preference, there is a slide rail 16 between the movable fixture 3 and the bottom plate 10, which can ensure smoother sliding of the movable fixture 3 and prevent the guide shaft 9 and the screw 4 or screw 12 from bending.

The feeding method of tooling 21 can be pneumatic clamping or manual clamping. For pneumatic clamping, the feeding device 15 mainly includes a cylinder 6, a cylinder seat 8, a foot valve 7, and the cylinder 6 is composed of a cylinder seat 8 Fixed on the base plate 10, the cylinder 6 is connected to the movable fixture 3 through the screw rod 4, and there is a nut 5 on the screw rod 4 to adjust and limit the position of the screw rod 4, and the cylinder 8 is connected to the foot valve 7, wherein the foot valve 7 can also be Manual valve, its function and effect are the same.

For manual clamping, the feeding device 15 mainly includes a screw mandrel 12, a hand wheel 13, a handle 14, the screw mandrel 12 is fixed with the movable fixture 3, and the fixed handwheel 13 at the end after passing through the fixed fixture 1, the screw mandrel 12 and the There are matching threads on the fixing fixture 1, and for easy operation, a handle 14 is arranged on the handwheel 13.

During operation, put the bolt into the threaded hole of the chuck 2, then move the position of the tooling 21 on the guide rail 20 of the milling machine, and align the position, that is, align the left side of the milling cutter 19 with the center of the bolt 17, for pneumatic clamping For the fixture, step on the foot valve 7, the cylinder 6 pushes the screw 4 to move, thereby pushing the movable fixture 3 to move towards the fixed fixture 1, and clamps the bolt 17; for the manually clamped fixture, turn the handle 14 by hand, and the movable fixture 3 Driven by the screw rod 11, approach the fixing fixture 1 until the bolt 17 is clamped, and then start the milling machine 18 to mill the groove, which is simple and convenient to operate and will not damage the thread.

The following is a detailed description of the process of using this equipment to process the L-shaped groove of the anti-theft bolt:

Above-mentioned milling machine 18 can select common drilling and milling machine, disk milling machine, end milling machine for use, here is an example with common drilling and milling machine for illustration;

①. Place the tooling 21 shown in Fig. 1 and Fig. 2 on the working table of the milling machine 18, fix it on the working table with M12 bolts, and select the chuck 2 of the corresponding specification (that is, the bolts of different specifications are selected chucks of different specifications), install it on the L-shaped groove of the fixture (1, 3), and then install the end mill 19 on the milling fixture. At this time, it should be noted that the diameter of the milling cutter 19 is Φ6 for M12 bolts , M16-M20 bolts use a milling cutter with a diameter of Φ6-Φ8, bolts above M20 use a milling cutter with a diameter of Φ8-Φ10, and bolts above M30 use a milling cutter with a diameter of Φ12, and then tighten the milling cutter 19 and tighten it to prevent the milling cutter from Loose or fall off.

②. Put the bolt 17 in the chuck 2. If it is a single-nut bolt, the end of the thread should be level with the chuck, so that it is easy to control the end of the thread to leave 1 pitch, and the double-nut bolt should leave a nut as required. The distance is also placed at the same position as the chuck. The milling cutter bolts should be calibrated before milling slots. Adjust the drilling and milling machine 18 with the milling cutter 19 at a distance of 5-20mm from the thread surface of the bolt 17. Press the rod down to the thread surface, and check whether the left side of the milling cutter 19 is aligned with the center of the thread. The purpose is to ensure that the short side of the L-shaped groove of the bolt is aligned with the center of the bolt 17. After clamping, return the milling cutter 19 to the end of the thread, and put down the drill pipe To the position of the small diameter of the thread (use the hand wheel on the side of the drilling and milling machine for fine adjustment).

③. Check whether there are sundries on the operating table and whether the electrical appliances are intact. Adjust the rotating speed between 1000-1500 rpm. After turning on the power, check whether the rotating speed is normal. Slowly push forward until the position in step ② (that is, the end of the thread of the single-nut bolt should be level with the chuck, and the distance of a nut should be left for the double-nut bolt) to stop, reverse the workbench together with the tooling Exit, stop at 5-20mm from the end of the thread, loosen the chuck and take out the bolt to check whether it meets the requirements.

④. During the inspection, ring gauges or special testing tools can be used in combination with steel wires of standard diameters, that is, the ring gauges are first screwed into the middle of the L-shaped groove, and the steel wire with the same diameter as the knurled roller pin to be used is inserted into the L-shaped groove. At this time, there are three situations: first, if it is too tight or cannot be inserted, you can replace the steel wire with a smaller size. If the knurled roller pin of the first specification is still tight, the L-shaped groove should be re-milled; for the second type, if the tightness is appropriate, the L-shaped groove of the bolt is qualified; for the third type, if it is too loose, it can be changed to a larger size If the steel wire corresponding to the knurled roller pin of the knurled roller pin is properly tightened at this time, the L-shaped groove is qualified, but it needs to be marked to indicate that the bolt should be equipped with a knurled roller pin of a larger size; if the bolt is changed to a larger size If the bolt is still loose, the bolt is scrapped.

⑤. Check whether the length B of the long side is twice the length of the short side A, that is, whether the short side A is on the center line of the bolt. Generally, any deviation within 0.5mm from the center line can play an anti-theft role, and we all recognize it as qualified.

⑥. Trial machining of 3-5 bolts, adjust the position of the milling cutter 19 properly and then lock it, and then start normal machining. After machining 50-100 bolts, re-inspection is required to check whether the size deviates from the requirements. If the size deviates, intermittent adjustments are required. .

⑦. When milling the L-shaped groove, since the milling cutter 19 is rotating, burrs will be generated on the edge of the L-shaped groove. After hot-dip galvanizing, it cannot be matched with the nut, so it needs to be deburred. Manually rotating the die can be used Advance and retreat method and pneumatic rotation advance and retreat method to complete. Among them, the manual method is "fix the hexagonal head in the hexagonal mold, put the die on the end of the thread by hand, deburr it by forward rotation, and complete the reverse rotation and exit; the pneumatic method is: install a hexagonal mold on the head of the pneumatic wrench, put the bolt Put the head inside, fix the die together with an empty pipe, hold the empty pipe in hand, use the pneumatic wrench to switch on, perform forward and reverse actions, put the die into the end of the thread to remove the burr, after the burr is removed, heat Dip galvanized, then assemble and inspect.

Claims (3)

1. A kind of used equipment of making antitheft bolt L-shaped groove, comprises frock (21), milling machine (18), it is characterized in that: described frock (21) mainly comprises fixed fixture (1) and movable fixture (3) and The collet (2), the fixed fixture (1) and the movable fixture (3) respectively fix the left and right halves of the collet (2), the middle part of the collet (2) is a threaded hole, and the left and right halves There is a gap, the left half is aligned up and down, the lower part of the right half is symmetrical to the left half, the difference between the width of the upper slot and the long side of the L-shaped slot on the anti-theft bolt corresponding to the threaded hole in the middle is a positive number, and the chuck (2) There are threaded holes for fixing horizontally in the middle; the fixed fixture (1) is connected with the movable fixture (3) through the guide shaft (9), and the movable fixture (3) is connected with the feeding device (15). The bottom of the clamp (1) and the movable clamp (3) are inclined to both sides, there is a slide rail (16) between the movable clamp (3) and the bottom plate (10), and the guide shaft (9) is on the fixed clamp (1) and the part between the movable fixture (3) has a limited boss; the tooling (21) is placed on the milling machine (18), and the middle part of the chuck (2) is clamped by the threaded clamping bolt (17 ). 2. The equipment used for making L-shaped grooves for anti-theft bolts according to claim 1, characterized in that: the left and right halves of the chuck (2) are 50-70mm long, 40-55mm wide, and 25-55mm high. 40mm. 3. A process for making an anti-theft bolt L-shaped groove, characterized in that it comprises the following steps: ①. Select the collet of the corresponding specification and install it on the L-shaped groove of the fixture (1, 2), and then install the end mill on the milling cutter fixture; ②. Put the bolt (17) in the chuck (2). If it is a single-nut bolt, the end of the thread should be level with the chuck. A distance of one nut should be left for the double-nut bolt as required. Head level position, adjust the milling machine (18) with the milling cutter (19) installed at a distance of 5-20 mm from the thread surface of the bolt (17), press the drill rod down to the thread surface, and check whether the left side of the milling cutter (19) is Align with the center of the thread, and after clamping, retract the milling cutter (19) to the end of the thread, and lower the drill pipe to the position of the small diameter of the thread; ③. Adjust the speed of the milling machine (18) between 1000-1500 rpm, check whether the speed is normal, and turn the handwheel to slowly push the workbench together with the tooling (21) forward until the position in step ② (that is, the single nut and bolt should be Put the end of the thread at the same level as the collet, and the double-nut bolt should leave a nut distance as required) to stop, reverse the workbench and the tooling (21) together, stop at 5-20mm from the end of the thread, and loosen The collet takes out the bolt and checks that it meets the requirements. ④. Check whether the radial depth of the L-shaped groove is qualified; ⑤. Check whether the length B of the long side is twice the length A of the short side; ⑥. Trial process several bolts (17), adjust the position of the milling cutter (19) properly and lock it, and start normal processing; ⑦. Deburring: It can be completed by manual rotary die advance and retreat method and pneumatic rotary advance and retreat method.

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