A special flat drill for violently breaking a lock core and a processing method thereof

Abstract

The present invention relates to the field of unlocking technology, specifically to a special flat drill for violently breaking a lock core and a processing method thereof, comprising a tungsten steel flat drill body, the tungsten steel flat drill body comprising a cutting edge portion and a drill shank portion, the cutting edge portion being a diamond structure, the cutting edge portion and the drill shank portion being an integrally formed structure, an end tooth portion being provided at one end of the cutting edge portion away from the drill shank portion, the end tooth portion being used for positioning and cutting the cutting edge portion, a wedge-shaped cutting edge being provided at the corners of the cutting edge portion, the cutting depth of the wedge-shaped cutting edge decreasing successively along the cutting edge portion. The present invention adopts a combined design of angle drilling and milling and side-edge milling and twisting, which effectively combines the processing requirements of drilling, milling, twisting and grinding, the high-grade wear-resistant and anti-fracture integral tungsten steel ensures the durability and service life of the tool, the reasonable tool performance parameter design ensures the good cutting performance of the tool, the unique structural design ensures the extremely high anti-fracture performance of the tool, the process is novel, easy to implement, and has good application prospects.

Description

Technical Field

[0001] The invention relates to a flat drill and a processing method thereof, in particular to a special flat drill for violently breaking a lock core and a processing method thereof, belonging to the technical field of unlocking. Background Art

[0002] The lock core is the main part that controls the opening of the lock and is the heart of the lock. It refers to the core part that can rotate with the key and drive the movement of the lock bolt. The lock core adopts multiple anti-theft technologies and a variety of special-shaped anti-pulling pins to prevent technical opening. With the unique pin and blade structure design, it has high security performance against technical opening. The current super C-class locks have comprehensively improved the anti-pry performance. After locking the door, the thickened and strengthened lock tongue on the side lock that is matched with the C-class lock will automatically pop out, increasing the anti-pry effect of the side lock point and the difficulty of technical unlocking to an unprecedented extreme.

[0003] At present, the latest encrypted locks are used, and the key has an anti-twisting function, with an opening rate of one in 500,000, which can effectively prevent technical unlocking, master key unlocking, electric vibration gun rejection, tinfoil unlocking, and bump key unlocking, solving the problem of anti-theft doors not being anti-theft. However, due to the improvement of the precision of the lock core, the difficulty of technical unlocking is also increased simultaneously. Once the key is lost and the lock cannot be unlocked technically, it is necessary to break the door violently, which ultimately causes heavy losses of both the door and the lock. How to quickly and violently break the lock core to open the door after technical unlocking cannot be achieved has become an urgent problem to be solved. The traditional method is to use a drill to drill the lock core and then cannot expand the hole, the milling cutter cannot be held on the handheld electric drill for milling, the anti-drill column is difficult to drill through, and the cost of violent breaking is high and the operation is cumbersome.

[0004] Therefore, it is urgent to improve the special flat drill for breaking the lock core to solve the above-mentioned problems. Summary of the invention

[0005] The purpose of the present invention is to provide a special flat drill for violently breaking open a lock core and a processing method thereof. The combined design of angle drilling and milling and side blade milling and twisting is adopted, which effectively combines the processing requirements of drilling, milling, twisting and grinding. The high-grade wear-resistant and anti-fracture integral tungsten steel ensures the durability and service life of the tool. The reasonable tool performance parameter design ensures the good cutting performance of the tool. The unique structural design ensures the extremely high anti-fracture performance of the tool. The process is novel and easy to implement, and has good application prospects.

[0006] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0007] A special flat drill for violently breaking a lock core comprises a tungsten steel flat drill body, wherein the tungsten steel flat drill body comprises a cutting edge portion and a drill handle portion, wherein the cutting edge portion is a diamond-shaped structure, and the cutting edge portion and the drill handle portion are an integrally formed structure;

[0008] Through the above technical scheme, the cutting edge and the drill shank are cut out by the tungsten steel flat drill body, and the tungsten steel flat drill body is a tungsten steel fine-ground round bar containing 10-12% cobalt, preferably K44-K55 tungsten steel fine-ground round bar containing 10-12% cobalt, which has high structural strength and strong fracture resistance, so it has a long service life and saves production costs.

[0009] An end tooth portion is provided at one end of the cutting edge portion away from the drill shank portion, and the end tooth portion is used to position and cut the cutting edge portion. Wedge-shaped cutting edges are provided at the corners of the cutting edge portion, and the cutting depth of the wedge-shaped cutting edges decreases successively along the cutting edge portion.

[0010] Through the above technical scheme, due to the enhanced strength of the tool core and the design of the wedge-shaped cutting edge, the drilling, milling and grinding capabilities of the tool are significantly improved, and the purpose of widening the lock core can be achieved during the process of drilling the lock core. It has the characteristics of novel technology, simple operation, high cost-to-quality ratio and easy implementation.

[0011] Preferably, heat dissipation grooves are provided on the four side surfaces of the cutting edge portion, and the heat dissipation grooves are used to dissipate heat from the cutting edge portion.

[0012] Preferably, a transition surface is provided at the connection between the drill shank portion and the cutting edge portion, the transition surface is used for chip removal, and a plurality of centrally symmetrical mounting grooves are provided on the drill shank portion;

[0013] A magnet groove is provided inside the installation groove, and a magnetic steel is fixedly arranged inside the magnet groove;

[0014] Through the above technical scheme, during the installation of the drill shank, the drill shank can be quickly positioned by the magnet on the magnet slot. At the same time, when not in use, the tungsten steel flat drill body can be placed on metal equipment, such as iron, due to the force of the magnet, which can effectively prevent the loss of the tungsten steel flat drill body and reduce unnecessary losses. The magnet slot can increase the stability of the entire tungsten steel flat drill body during installation to prevent loosening during cutting and cause safety accidents.

[0015] A processing method for a special flat drill for violently breaking a lock core comprises the following steps:

[0016] Step 1: Raw material preparation: Select a high-grade wear-resistant and break-resistant tungsten steel flat drill body with a length of 70 mm -90 mm;

[0017] Step 2: Step processing: The corresponding tungsten steel flat drill body is finely ground into a rod in a step machine to form a step blank. The diameter of the step blank after processing is 4mm-6.0 mm, and the angle of the transition surface is 50°-70°;

[0018] Step 3: Blade slotting: After adding the step difference to the step difference blank in the five-axis grinding center, use the parallel grinding wheel to open a wedge-shaped cutting edge on the front end of the step difference blank to form a blade slotted blank, and open a heat dissipation groove. The blade slotting is a straight slot with a core diameter of 3.2 mm -4.8 mm;

[0019] Step 4: External clearance angle processing: Use 1V1 angled parallel grinding wheel to process the external clearance angle of the slotted blank to form an external clearance angle blank. The blade diameter of the external clearance angle processing is 3.9 mm -5.9 mm, the blade length is 25 mm -33 mm, the first plane clearance angle is 8°-15°, and the side edge margin is 0.1 mm;

[0020] Step 5: End tooth back angle processing: Use a bowl-shaped grinding wheel to process the end tooth back angle of the outer circular back angle blank to form a flat drill product. The end tooth back angle of the end tooth 1 is 25°-35°, and the end tooth 2 back angle is 45°-60°;

[0021] Step 6: Subsequent processing: Subsequent processing of key knife products, including appearance and data inspection, cleaning, coating, marking and packaging.

[0022] Preferably, the tungsten steel flat drill body is a tungsten steel finely ground round bar containing 10-12% cobalt, and the model of the tungsten steel finely ground round bar containing 10-12% cobalt is K44-K55.

[0023] Preferably, the step 2 is specifically as follows: the linear speed of the grinding wheel for step difference treatment is 25-40 m / s, the feed is 0.05-0.2 mm / r, and the processing load power is 2-20%.

[0024] Preferably, the step three is specifically as follows: the linear speed of the grinding wheel for blade grooving is 20-35 m / s, the feed is 0.02-0.1 mm / r, and the processing load power is 2-20%.

[0025] Preferably, the step four is specifically as follows: the grinding wheel linear speed of the outer cylindrical back-shoveling treatment is 20-35m / s, the feed is 0.02-0.1mm / r, and the processing load power is 2-20%.

[0026] Preferably, the step five is specifically as follows: the grinding wheel linear speed for end tooth back angle processing is 20-35m / s, the feed 0.01 is -0.06mm / r, and the processing load power is 2-20%.

[0027] The present invention has at least the following beneficial effects:

[0028] The combined design of angle drilling and milling and side edge milling and twisting effectively combines the processing requirements of drilling, milling, twisting and grinding. The high-grade wear-resistant and anti-fracture integral tungsten steel ensures the durability and service life of the tool. The reasonable tool performance parameter design ensures the good cutting performance of the tool. The unique structural design ensures the extremely high anti-fracture performance of the tool. The process is novel and easy to implement, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0030] Figure 1 A perspective view of the present invention;

[0031] Figure 2 It is a front view of the present invention;

[0032] Figure 3 A top view of the present invention;

[0033] Figure 4 It is a partial front view of the present invention;

[0034] Figure 5 is a cross-sectional view of a drill shank of the present invention;

[0035] Figure 6 It is a process flow chart of the present invention.

[0036] In the figure, 1-tungsten steel flat drill body, 2-cutting edge portion, 201-end tooth portion, 202-wedge-shaped cutting edge, 203-heat dissipation groove, 3-drill handle portion, 301-transition surface, 302-mounting groove, 303-magnet groove, 4-magnet steel. DETAILED DESCRIPTION

[0037] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0038] like Figure 1-Figure 6 As shown, the special flat drill for violently breaking the lock core and the processing method thereof provided in this embodiment include a tungsten steel flat drill body 1, the tungsten steel flat drill body 1 includes a cutting edge portion 2 and a drill handle portion 3, the cutting edge portion 2 is a diamond structure, and the cutting edge portion 2 and the drill handle portion 3 are an integrally formed structure;

[0039] The cutting edge 2 and the drill handle 3 are cut out by the tungsten steel flat drill body 1, and the tungsten steel flat drill body 1 is made of tungsten steel finely ground round bars containing 10-12% cobalt, preferably K44-K55 tungsten steel finely ground round bars containing 10-12% cobalt, which has high structural strength and strong fracture resistance, so it has a long service life and saves production costs;

[0040] An end tooth portion 201 is provided at one end of the cutting edge portion 2 away from the drill shank portion 3, and the end tooth portion 201 is used to position and cut the cutting edge portion 2. Wedge-shaped cutting edges 202 are provided at the corners of the cutting edge portion 2, and the cutting depth of the wedge-shaped cutting edges 202 decreases successively along the cutting edge portion 2.

[0041] Due to the enhanced strength of the tool core and the design of the wedge-shaped cutting edge 202, the tool's drilling, milling and grinding capabilities are significantly improved, and the purpose of widening the lock core can be achieved during the process of drilling the lock core. It has the characteristics of novel technology, simple operation, high cost-to-quality ratio and easy implementation.

[0042] In this embodiment, if Figure 1 As shown, heat dissipation grooves 203 are provided on the four side surfaces of the cutting edge portion 2. The heat dissipation grooves 203 are used to dissipate the heat of the cutting edge portion 2. The heat dissipation grooves 203 can dissipate the heat generated by the cutting edge portion 2 and increase the service life of the tungsten steel flat drill body 1.

[0043] In this embodiment, if Figure 2 and Figure 5 As shown, a transition surface 301 is provided at the connection between the drill shank portion 3 and the cutting edge portion 2, and the transition surface 301 is used for chip removal. A plurality of centrally symmetrical mounting grooves 302 are provided on the drill shank portion 3;

[0044] A magnet slot 303 is provided inside the mounting slot 302, and a magnetic steel 4 is fixedly provided inside the magnet slot 303;

[0045] During the installation of the drill shank 3, the drill shank 3 can be quickly positioned by the magnet 4 on the magnet slot 303. At the same time, when not in use, the tungsten steel flat drill body 1 can be placed on metal equipment, such as iron, due to the force of the magnet 4. This can effectively prevent the tungsten steel flat drill body 1 from being lost and reduce unnecessary losses. The magnet slot 303 can increase the stability of the entire tungsten steel flat drill body 1 during installation to prevent loosening during cutting and causing safety accidents.

[0046] A processing method for a special flat drill for violently breaking a lock core comprises the following steps:

[0047] Step 1: Raw material preparation: Select a high-grade wear-resistant and anti-fracture tungsten steel flat drill body 1. The length of the tungsten steel flat drill body 1 is 70 mm -90 mm, which can meet the requirements of different lock core lengths. The tungsten steel flat drill body 1 is a tungsten steel fine-ground round bar containing 10-12% cobalt. The model of the tungsten steel fine-ground round bar containing 10-12% cobalt is K44-K55, with high structural strength and strong anti-fracture ability. This material is suitable for the processing of drilling and milling tools;

[0048] Step 2: step difference processing: the corresponding tungsten steel flat drill body 1 is finely ground in the step difference machine to form a step difference blank. The diameter of the step difference after processing is 4mm-6.0 mm. The angle of the transition surface 301 is 60°. The design of the step difference angle is close to the principle of equilateral triangle, which is beneficial to ensure the rigidity of the material blade. The processing parameters of the step difference processing are the grinding wheel linear speed of 25-40m / s, the feed of 0.05-0.2mm / r, and the processing load power of 2-20%;

[0049] Step 3: blade slotting: add the step-difference blank after the step-difference in the five-axis grinding center, use the parallel grinding wheel to open the wedge-shaped cutting edge 202 on the front end of the step-difference blank to form a blade slotted blank, and open a heat dissipation groove 203. The blade slotting is a straight slot, and the core diameter is 3.2 mm -4.8 mm. This parameter is designed to ensure the strength of the tool body center as much as possible to ensure that the tool will not break during the drilling and milling process in the lock core hole. The processing parameters of the blade slotting are a grinding wheel linear speed of 20-35 m / s, a feed of 0.02-0.1 mm / r, and a processing load power of 2-20%;

[0050] Step 4: External clearance angle processing: Use 1V1 angled parallel grinding wheel to process the external clearance angle of the slotted blank to form an external clearance angle blank. The blade diameter of the external clearance angle processing is 3.9 mm -5.9 mm, the blade length is 25 mm -33 mm, the first plane clearance angle is 8°-15°, and the side blade edge band is 0.1 mm. This edge band design can effectively improve the blade strength and effectively protect the blade during the milling process. The processing parameters of the external clearance angle processing are the grinding wheel linear speed of 20-35m / s, the feed of 0.02-0.1mm / r, and the processing load power of 2-20%;

[0051] Step 5: End tooth back angle processing: Use a bowl-shaped grinding wheel to process the end tooth back angle of the outer round back angle blank to form a flat drill product. The end tooth back angle processing end tooth 1 back angle 204 is 25°-35°, and the end tooth 2 back angle 205 is 45°-60°. The larger end tooth back angle design allows the drill tip to have better drilling and milling capabilities and centering capabilities, so that the drill bit is not easy to deviate during the drilling and milling process. The end tooth back angle processing is the processing parameters of the grinding wheel linear speed of 20-35m / s, the feed 0.01-0.06mm / r, and the processing load power of 2-20%;

[0052] Step 6: Subsequent processing: Subsequent processing of key knife products, including appearance and data inspection, cleaning, coating, marking, and packaging. The appearance and data inspection must ensure that the knife has no defects, is cleaned without oil stains, the coating must meet the bonding strength standards, the marking is clear, and the packaging is secure and safe.

[0053] The combined design of angle drilling and milling and side edge milling and twisting effectively combines the processing requirements of drilling, milling, twisting and grinding. High-grade wear-resistant and anti-fracture integral tungsten steel fine grinding material is used to ensure the durability and service life of the tool. Reasonable tool performance parameter design ensures good cutting performance of the tool. The unique structural design ensures extremely high anti-fracture performance of the tool. The process is novel, the operation is simple, the cost-effectiveness is high, and it is easy to implement. When drilling and expanding the lock core, the tool manufactured by the above process has a good application prospect because of the enhanced core strength and the design of the side edge wedge cutting edge 202. The tool drilling, milling and grinding capabilities are significantly improved, and the anti-fracture strength is greatly enhanced.

[0054] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0055] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0056] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and variations made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A special flat drill for violently breaking open a lock core, comprising a tungsten steel flat drill body (1), characterized in that: The tungsten steel flat drill body (1) comprises a cutting edge portion (2) and a drill shank portion (3); the cutting edge portion (2) is a diamond-shaped structure; the cutting edge portion (2) and the drill shank portion (3) are an integrally formed structure; An end tooth portion (201) is provided at one end of the cutting edge portion (2) away from the drill shank portion (3), and the end tooth portion (201) is used for positioning and cutting the cutting edge portion (2). Wedge-shaped cutting edges (202) are provided at the corners of the cutting edge portion (2), and the cutting depth of the wedge-shaped cutting edges (202) decreases successively along the cutting edge portion (2). Heat dissipation grooves (203) are provided on the four side surfaces of the cutting edge portion (2), and the heat dissipation grooves (203) are used for dissipating heat from the cutting edge portion (2). A transition surface (301) is provided at the connection between the drill shank portion (3) and the cutting edge portion (2), and the transition surface (301) is used for chip removal. A plurality of centrally symmetrical mounting grooves (302) are provided on the drill shank portion (3); A magnet groove (303) is provided inside the installation groove (302), and a magnetic steel (4) is fixedly arranged inside the magnet groove (303).

2. A method for processing a special flat drill for violently breaking a lock core as claimed in claim 1, characterized in that: The following steps are involved: Step 1: Raw material preparation: Select a high-grade wear-resistant and break-resistant tungsten steel flat drill body (1), the length of which is 70 mm to 90 mm; Step 2: step difference processing: the corresponding tungsten steel flat drill body (1) is finely ground in a step difference machine to form a step difference blank. The diameter of the step difference blank after processing is 4mm-6.0mm, and the angle of the transition surface (301) is 50°-70°; Step 3: blade slotting: adding the step-difference blank into the five-axis grinding center, using a parallel grinding wheel to open a wedge-shaped cutting edge (202) on the front end of the step-difference blank to form a blade slotted blank, and opening a heat dissipation groove (203), the blade slotting process is a straight slotting, and the core diameter is 3.2mm-4.8mm; Step 4: External clearance angle processing: Use 1V1 angled parallel grinding wheel to process the external clearance angle of the slotted blank to form an external clearance angle blank. The blade diameter of the external clearance angle processing is 3.9mm-5.9mm, the blade length is 25mm-33mm, the first plane clearance angle is 8°-15°, and the side edge margin is 0.1mm; Step 5: End tooth back angle processing: Use a bowl-shaped grinding wheel to process the end tooth back angle of the outer circular back angle blank to form a flat drill product, wherein the end tooth back angle processing has an end tooth first back angle (204) of 25°-35°, and an end tooth second back angle (205) of 45°-60°; Step 6: Subsequent processing: Subsequent processing of key knife products, including appearance and data inspection, cleaning, coating, marking, and packaging. The tungsten steel flat drill body (1) is a tungsten steel finely ground round bar containing 10-12% cobalt, and the model of the tungsten steel finely ground round bar containing 10-12% cobalt is K44-K55. The step 2 is specifically as follows: the grinding wheel linear speed for step difference treatment is 25-40m / s, the feed is 0.05-0.2mm / r, and the processing load power is 2-20%. The step 3 is specifically as follows: the grinding wheel linear speed for blade slotting treatment is 20-35m / s, the feed is The processing load power is 2-20% and the processing speed is 0.02-0.1mm / r. The processing load power is 2-20%. The step 4 is as follows: the grinding wheel linear speed for the outer cylindrical back-shoveling treatment is 20-35m / s, the feed is 0.02-0.1mm / r, and the processing load power is 2-20%. The step 5 is as follows: the grinding wheel linear speed for the end tooth back angle treatment is 20-35m / s, the feed is 0.01-0.06mm / r, and the processing load power is 2-20%.

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