Hole opening device

Abstract

This utility model belongs to the technical field of machining equipment and discloses a hole-opening device, including a connector, a cutting tool, a mold, and a power source. The mold is positioned on the part to be holed, and the cutting tool is movably mounted on the mold. The connector includes an outer sleeve, a travel sleeve, a travel rod, and a connecting rod. The outer sleeve connects the power source and the mold. The travel sleeve and the connecting rod are coaxially connected and slidably mounted inside the outer sleeve. The connecting rod connects the cutting tool. The travel sleeve is slidably mounted inside the outer sleeve, and the travel rod extends into the travel sleeve and connects to the power source. The travel rod and travel sleeve have sequentially operating states: a screw-in feed drive state, an idle stop state, and a screw-in retraction drive state. In the screw-in feed drive state, the cutting tool opens the part to be holed. In the idle stop state, the travel sleeve is stationary relative to the outer sleeve, and the cutting tool's position relative to the mold remains unchanged. In the screw-in retraction drive state, the cutting tool retracts. This hole-opening device disengages the cutting tool after hole opening, avoiding continuous tool movement that could cause collisions and reducing the power requirements of the power source.

Description

Technical Field

[0001] This utility model relates to the field of machining equipment technology, and in particular to a hole-opening device. Background Technology

[0002] In engineering, hole-making operations are generally carried out using the principles of drilling or punching.

[0003] Drilling, which involves using a rotating drill bit to create holes in the material, is a time-consuming process that often produces burrs. Punching, on the other hand, uses hydraulic or pneumatic devices to apply pressure to a die, creating punched holes. This method requires significant power, placing high demands on the power source. For example, typical hydraulic hole saws, electric drills, or pneumatic punches all require at least 220V, limiting their use to locations with electrical outlets. Furthermore, hydraulic hole saws are complex to operate, involving cumbersome steps such as die installation and hydraulic line connection, which are time-consuming and require skilled and experienced operators. Additionally, the large size of these devices hinders portability and makes them unsuitable for use in environments requiring height or other hazardous conditions.

[0004] Therefore, there is an urgent need for a hole-opening device to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a hole-opening device that can improve hole-opening quality and efficiency. After hole-opening is completed, the cutting tool is unhooked to avoid the problem of continuous movement of the cutting tool causing collision damage. This also reduces the power requirements of the power source and expands the scope of application.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Drilling equipment, including connectors, cutting tools, molds, and power sources;

[0008] The mold is positioned on the part to be drilled, and the cutting tool is movably disposed in the mold;

[0009] The connector includes an outer sleeve, a travel sleeve, a travel rod, and a connecting rod. The outer sleeve is connected between the power source and the mold. The travel sleeve and the connecting rod are coaxially connected and slidably disposed within the outer sleeve. The connecting rod is connected to the cutting tool.

[0010] The travel sleeve is slidably disposed inside the outer sleeve, the travel rod extends into the travel sleeve and is connected to the power source, the power source can drive the travel rod to rotate, and the travel rod and the travel sleeve have sequentially performing a screw-connected feed transmission state, an idle limit state, and a screw-connected retraction transmission state;

[0011] In the screw-in feed drive mode, the stroke rod rotates forward under the drive of the power source, causing the stroke sleeve to move axially along the outer sleeve. This, along with the connecting rod, pushes the tool closer to and presses it into the part to be drilled.

[0012] In the idling limit state, the stroke rod and the stroke sleeve are in the idling limit state, the stroke rod rotates in the stroke sleeve, the stroke sleeve is stationary relative to the outer sleeve, and the position of the cutter relative to the mold remains unchanged;

[0013] In the screw-connected retraction drive state, the tool can also move away from the part to be drilled under the reverse rotation of the stroke rod.

[0014] As a preferred embodiment of the hole-opening device provided by this utility model, the theoretical stroke distance of the cutter during the hole-opening process is greater than the screw connection distance between the stroke rod and the stroke sleeve.

[0015] As a preferred embodiment of the hole-opening device provided by this utility model, the travel sleeve is provided with an internal thread section and a clearance and receiving section in sequence along the axial direction near the connecting rod, and the travel rod is provided with a transmission section and an external thread section in sequence along the axial direction near the connecting rod, and the transmission section is connected to the output shaft of the power source;

[0016] The travel rod rotates under the drive of the power source until the external thread section and the internal thread section are screwed together, which can drive the travel sleeve to move axially along the outer sleeve;

[0017] The travel sleeve can drive the cutter to extend out of the mold and approach the part to be drilled through the connecting rod. When the cutter rotates away from the internal thread section and fully extends into the clearance and receiving section, it can perform pressure shearing and drilling on the part to be drilled.

[0018] As a preferred embodiment of the hole-opening device provided by this utility model, an infeed elastic element is provided inside the outer sleeve. The infeed elastic element is coaxially sleeved and connected to the transmission section and abuts against the end of the stroke sleeve away from the connecting rod. The external thread section can engage with the infeed starting end of the internal thread section under the pushing action of the infeed elastic element.

[0019] As a preferred embodiment of the hole-opening device provided by this utility model, a retraction elastic element is provided inside the outer sleeve. The retraction elastic element is coaxially sleeved and connected to the connecting rod, and abuts against the inside of the outer sleeve near the tool. The external threaded section can engage with the retraction starting end of the internal threaded section under the pushing action of the retraction elastic element.

[0020] As a preferred embodiment of the hole-opening device provided by this utility model, a first connecting sleeve is coaxially fixed at the end of the connecting rod. The first connecting sleeve is movably disposed in the mold and connected to the cutting tool.

[0021] As a preferred embodiment of the hole-opening device provided by this utility model, the first connecting sleeve and the cutting tool are detachably connected by a cutting tool screw, the mold has a cutting tool changing through hole, and the cutting tool screw can be exposed in the cutting tool changing through hole.

[0022] As a preferred embodiment of the opening device provided by this utility model, the travel sleeve is provided with a receiving groove on the outer peripheral side of the inner wall of the outer sleeve, and the receiving groove can accumulate lubricating oil.

[0023] As a preferred embodiment of the opening device provided by this utility model, the outer sleeve is provided with an oil injection hole, through which lubricating oil can be injected between the inner wall of the outer sleeve and the outer peripheral side of the travel sleeve.

[0024] As a preferred embodiment of the opening device provided by this utility model, the connector further includes a bearing, which is disposed inside the outer sleeve, and the stroke rod is rotatably disposed inside the outer sleeve via the bearing.

[0025] As a preferred embodiment of the hole-opening device provided by this utility model, the cutting tool has an arc-shaped cutting edge arranged circumferentially, and the arc-shaped cutting edge protrudes in the axial direction of the cutting tool in a direction away from the connecting rod.

[0026] As a preferred embodiment of the hole-opening device provided by this utility model, the mold is provided with a C-shaped structure, and a backing part is provided on one side of the opening of the mold. The cutting head of the cutter and the backing part can respectively press and shear the part to be opened on both sides of the part to be opened.

[0027] The beneficial effects of this utility model are:

[0028] The hole-opening device provided by this utility model includes a connector, a cutting tool, a mold, and a power source. The mold is positioned on the part to be holed, and the cutting tool is movably disposed within the mold. The connector includes an outer sleeve, a travel sleeve, a travel rod, and a connecting rod. The outer sleeve connects the power source and the mold. The travel sleeve and the connecting rod are coaxially connected and slidably disposed within the outer sleeve. The connecting rod is connected to the cutting tool. The mold allows for the positioning of the cutting tool and the connector, ensuring that the cutting tool can be accurately assembled onto the part to be holed, thus guaranteeing the accuracy of the subsequent hole opening position. The travel sleeve is slidably disposed within the outer sleeve. The travel rod extends into the travel sleeve and is connected to the power source, which drives the travel rod to rotate. The travel rod and the travel sleeve have sequentially operating states: a screw-connected feed state, an idle limit state, and a screw-connected retraction state. In the screw-connected feed state, the travel rod rotates forward under the drive of the power source, causing the travel sleeve to move axially along the outer sleeve. The connecting rod then pushes the cutting tool closer to and presses it into the part to be holed. In other words, in the screw-connected feed drive mode, the connector drives the travel sleeve to move linearly during the rotation of the travel rod via a threaded connection, enabling smooth tool feed. It converts the rotational motion output by the power source into a moving, pressing, shearing motion of the tool, achieving pressure shearing for hole opening. This pressure shearing method improves hole quality, reduces burr generation, and increases opening efficiency. In the idle limit state, the travel rod rotates within the travel sleeve, which remains stationary relative to the outer sleeve, while the tool's position relative to the mold remains unchanged. This design ensures that continued rotation of the travel rod in the idle limit state will not drive the travel sleeve, creating a mechanical limiting effect between the travel rod, travel sleeve, and outer sleeve. This achieves tool disengagement, preventing the tool from continuing to move after opening and causing damage. In the screw-connected retraction drive mode, the tool can be moved away from the part to be opened by the reverse rotation of the travel rod, smoothly achieving tool retraction. By continuously switching between the aforementioned stroke rod and stroke sleeve in the screw-in feed drive state, idle limit state, and screw-in retraction drive state, the stroke rod drives the tool to move linearly by rotating, which can reduce the power requirements of the power source and expand the application range of the drilling equipment. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0030] Figure 1This is an assembly diagram of the hole-opening device and the component to be opened provided in this embodiment of the utility model;

[0031] Figure 2 This is a top view of the assembly state of the hole-opening device and the component to be opened according to an embodiment of the present utility model;

[0032] Figure 3 This is a partial structural diagram of the hole-opening device provided in this embodiment of the utility model. Figure 1 ;

[0033] Figure 4 This is a partial structural diagram of the hole-opening device provided in this embodiment of the utility model. Figure 2 ;

[0034] Figure 5 This is a partial structural diagram of the hole-opening device provided in this embodiment of the utility model. Figure 3 ;

[0035] Figure 6 This is a partial structural diagram of the hole-opening device provided in this embodiment of the utility model. Figure 4 ;

[0036] Figure 7 This is a partial structural cross-sectional view of the hole-opening device provided in this embodiment of the utility model.

[0037] In the picture:

[0038] 10. Components to be drilled;

[0039] 100. Knives; 110. Curved blade; 120. Knife screws;

[0040] 200. Mold; 210. Abutment part; 220. Tool changing through hole;

[0041] 300. Outer sleeve; 310. Feed elastic element; 320. Retraction elastic element; 330. Stroke outer sleeve section; 331. Oil injection hole; 332. Oil hole screw; 333. Sealing washer; 340. Connecting rod outer sleeve section; 341. Elastic element receiving cavity; 342. Abutting boss; 350. Limit nut;

[0042] 400, travel sleeve; 410, internal thread section; 420, clearance and receiving section; 430, receiving groove;

[0043] 500. Stroke rod; 510. Transmission section; 520. External thread section; 521. Conical head;

[0044] 600. Connecting rod; 610. First connecting sleeve; 620. Second connecting sleeve; 621. Inner clamping ring platform; 630. Clamping platform;

[0045] 700, Bearing; 710, First collar; 720, Second collar; 730, Deep groove ball bearing body;

[0046] 800. Outer lock nut. Detailed Implementation

[0047] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0050] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0051] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0052] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connect," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0053] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0054] In this embodiment, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0055] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0056] Reference Figure 1 and Figure 2 This embodiment provides a hole-opening device capable of opening holes in sheet metal components 10 of various shapes. The hole-opening device includes a connector, a cutter 100, a mold 200, and a power source (not shown).

[0057] Specifically, refer to Figures 2-7The mold 200 can be positioned on the part 10 to be drilled, and the cutter 100 is movably disposed in the mold 200. The connector includes an outer sleeve 300, a stroke sleeve 400, a stroke rod 500, and a connecting rod 600. The outer sleeve 300 is connected between the power source and the mold 200. The stroke sleeve 400 and the connecting rod 600 are coaxially connected and slidably disposed within the outer sleeve 300. The connecting rod 600 is connected to the cutter 100. The stroke sleeve 400 is slidably disposed within the outer sleeve 300. The stroke rod 500 extends into the stroke sleeve 400 and is connected to the power source. The power source can drive the stroke rod 500 to rotate. The stroke rod 500 and the stroke sleeve 400 have sequentially performing a screw-in feed drive state, an idle limit state, and a screw-in retraction drive state. It should be noted that during the forward rotation of the stroke lever 500, the stroke lever 500 and the stroke sleeve 400 can gradually switch from the screw-in feed transmission state to the idle limit state to complete the tool feed; during the reverse rotation of the stroke lever 500, the stroke lever 500 and the stroke sleeve 400 can switch from the idle limit state to the screw-in retraction transmission state to realize the tool retraction.

[0058] Specifically, in the screw-in feed drive mode, the stroke rod 500 rotates forward under the drive of the power source, which can drive the stroke sleeve 400 to move along the axial direction of the outer sleeve 300 toward the part 10 to be drilled. Through the connecting rod 600, it pushes the cutter 100 out of the mold 200 and close to the part 10 to be drilled, thus drilling the part 10. Using rotational motion to achieve pressure shearing drilling can reduce the power requirements of the power source and improve the drilling quality and efficiency.

[0059] More specifically, in the screw-connected retraction drive state, the stroke rod 500 reverses under the drive of the power source, which can drive the stroke sleeve 400 to move away from the part to be drilled 10 along the axial direction of the outer sleeve 300, thereby driving the connecting rod 600 to move away from the part to be drilled 10 along the axial direction of the outer sleeve 300, so that the tool 100 exits the part to be drilled 10.

[0060] More specifically, in the idle limiting state, the stroke rod 500 rotates within the stroke sleeve 400, which remains stationary relative to the outer sleeve 300, while the tool 100 remains in the same position relative to the mold 200. In other words, even if the stroke rod 500 continues to rotate in the idle limiting state, it will not drive the stroke sleeve 400, thus creating a mechanical limiting effect between the stroke rod 500, the stroke sleeve 400, and the outer sleeve 300. This achieves the disengagement of the tool 100, preventing it from continuing to move after the hole is opened, thus avoiding potential damage from impacts.

[0061] Reference Figure 7The travel sleeve 400 has an internal thread section 410 and a clearance receiving section 420 arranged sequentially in the axial direction near the connecting rod 600. The travel rod 500 has a transmission section 510 and an external thread section 520 arranged sequentially in the axial direction near the connecting rod 600. The transmission section 510 is connected to the output shaft of the power source. Driven by the power source, the travel rod 500 rotates until the external thread section 520 is screwed into the internal thread section 410, which can drive the travel sleeve 400 to move axially along the outer sleeve 300. The travel sleeve 400 can push against the connecting rod 600 to drive the cutter 100 to extend out of the mold 200 and approach the part 10 to be drilled. When the external thread section 520 rotates out of the internal thread section 410 and fully extends into the clearance receiving section 420, the cutter 100 can perform pressure shearing drilling on the part 10 to be drilled.

[0062] Specifically, the external thread section 520 is provided with a tapered head 521 at the head away from the transmission section 510, so that the external thread section 520 can extend into the internal thread section 410, and form a guide for the external thread section 520 and the internal thread section 410 to engage at the starting end of the feed.

[0063] More specifically, a tapered clearance groove is formed on the inner side of the end of the clearance receiving section 420 away from the internal thread section 410. The tapered clearance groove can match the shape of the tapered head 521 so as to avoid the tapered head 521 when the external thread section 520 is fully inserted into the clearance receiving section 420, thereby preventing damage to the structure of the tapered head 521.

[0064] Continue to refer to Figure 2 , Figure 3 and Figure 7 The outer sleeve 300 specifically includes a stroke outer sleeve section 330 and a connecting rod outer sleeve section 340 connected by coaxial threads. One end of the stroke outer sleeve section 330 has an internal thread, and one end of the connecting rod outer sleeve section 340 has an external thread, allowing them to be screwed together. The other end of the connecting rod outer sleeve section 340 also has an external thread and can be screwed into the mold 200. A limiting nut 350 is screwed onto the external thread of the connecting rod outer sleeve section 340 that connects to the stroke outer sleeve section 330. The limiting nut 350 abuts against the end of the stroke outer sleeve section 330 to fix the relative position between the stroke outer sleeve section 330 and the connecting rod outer sleeve section 340. The end of the stroke outer sleeve section 330 away from the connecting rod outer sleeve section 340 is screwed into the outer sleeve outer locking nut 800, which can be connected to a power source.

[0065] Specifically, the connector also includes a bearing 700. The bearing 700 is disposed within the travel sleeve section 330, and the travel rod 500 is rotatably disposed within the travel sleeve section 330 via the bearing 700. In one embodiment, the bearing 700 can be a planar thrust bearing, which has strong axial load capacity but high lateral friction. To address the above problems, in another embodiment, the bearing 700 can also be a deep groove ball bearing, which has very low lateral friction but insufficient axial load capacity.

[0066] More specifically, based on the above-mentioned problems, in this embodiment, the bearing 700 adopts a combined form. The bearing 700 includes a first collar 710, a second collar 720, and a deep groove ball bearing body 730. The first collar 710 and the second collar 720 are coaxially spaced apart, and the deep groove ball bearing body 730 is sandwiched between the first collar 710 and the second collar 720. The first collar 710 and the second collar 720 can hold the axis of the deep groove ball bearing body 730 in place, bearing all the load on the axis, so as to prevent the balls and outer ring of the deep groove ball bearing body 730 from bearing the reaction force during the pressing and shearing process.

[0067] Continue to refer to Figure 3 , Figure 4 and Figure 7 A first connecting sleeve 610 is coaxially fixed to the end of the connecting rod 600 away from the travel sleeve 400. The first connecting sleeve 610 extends movably into the mold 200 and is connected to the cutter 100. The first connecting sleeve 610 has an internal thread, and the end of the connecting rod 600 has an external thread. The connecting rod 600 is screwed to the first connecting sleeve 610. The cutter 100 extends into the other end of the first connecting sleeve 610 and is fixedly connected to the side of the first connecting sleeve 610 using bolts or other components.

[0068] Specifically, the first connecting sleeve 610 and the cutting tool 100 are detachably connected by a cutting tool screw 120. The mold 200 has a cutting tool changing through hole 220, through which the cutting tool screw 120 can be exposed. The user can remove and install the cutting tool screw 120 through the cutting tool changing through hole 220, so that the cutting tool 100 can be easily replaced even when the mold 200 and the connecting head are connected.

[0069] In this embodiment, the tool changer through hole 220 is specifically circular, and its diameter is larger than the head diameter of the tool screw 120. In other embodiments, in order to facilitate the disassembly and installation of the tool screw 120, the tool changer through hole 220 can also be elongated or oblong, and its specific shape is not limited in this embodiment.

[0070] Specifically, the connecting rod 600 is connected to the stroke sleeve 400 via a second connecting sleeve 620. One end of the second connecting sleeve 620 has an internal thread, and the other end has a reducing diameter forming an internal retaining ring 621. The end of the stroke sleeve 400 has an external thread, which can be screwed into the internal thread of the second connecting sleeve 620. The end of the connecting rod 600 away from the tool 100 has a retaining platform 630, the cross-sectional diameter of which is larger than the diameter of the connecting rod 600. The connecting rod 600 extends into the second connecting sleeve 620, and the retaining platform 630 abuts against the internal retaining ring 621, preventing the connecting rod 600 from dislodging from the second connecting sleeve 620.

[0071] Continue to refer to Figure 4 , Figure 5 and Figure 7 The travel sleeve 400 has a receiving groove 430 on its outer peripheral side facing the inner wall of the travel outer sleeve 330. The receiving groove 430 can accumulate lubricating oil. In this embodiment, the receiving groove 430 is specifically an annular groove structure, which can provide a space for lubricating oil to ensure the lubrication effect between the travel sleeve 400 and the travel outer sleeve 330.

[0072] Specifically, the outer sleeve section 330 is also provided with an oil injection hole 331, through which lubricating oil can be injected between the inner wall of the outer sleeve 300 and the outer periphery of the stroke sleeve 400. Under normal conditions, the oil injection hole 331 is generally sealed by an oil injection hole screw 332 and a sealing washer 333. The oil injection hole screw 332 is installed and sealed in the oil injection hole 331, and the sealing washer 333 is sandwiched between the oil injection hole screw 332 and the inner wall of the oil injection hole 331 to ensure a sealing effect and prevent oil leakage from the oil injection hole 331.

[0073] Continue to refer to Figures 4-7 An infeed elastic element 310 is provided inside the travel sleeve 330. The infeed elastic element 310 is coaxially sleeved on the transmission section 510, and its two ends abut against the first collar 710 and the end of the travel sleeve 400 away from the connecting rod 600, respectively. The external thread section 520 can engage with the infeed starting end of the internal thread section 410 under the pushing action of the infeed elastic element 310, thereby improving the smoothness of the infeed process. In this embodiment, the infeed starting end of the internal thread section 410 is the end of the internal thread section 410 away from the avoidance receiving section 420.

[0074] Continue to refer to Figures 5-7The connecting rod outer sleeve section 340 also includes a tool retraction elastic element 320. This tool retraction elastic element 320 is coaxially sleeved and connected to the connecting rod 600, and abuts against the interior of the outer sleeve 300 near the tool 100. The external thread section 520 can engage with the tool retraction starting end of the internal thread section 410 under the pushing action of the tool retraction elastic element 320. In this embodiment, the tool retraction starting end of the internal thread section 410 is the end of the internal thread section 410 near the clearance receiving section 420.

[0075] More specifically, in this embodiment, the inner part of the connecting rod outer sleeve 340 is hollow, forming an elastic element receiving cavity 341 with a cross-sectional area larger than that of the connecting rod 600. The cross-sectional area of ​​the elastic element receiving cavity 341 is also slightly larger than that of the second connecting sleeve 620, and the second connecting sleeve 620 can move coaxially within the elastic element receiving cavity 341. The inner side of the elastic element receiving cavity 341 near the tool 100 has a reduced diameter to form an abutment boss 342. The connecting rod 600 passes through the elastic element receiving cavity 341, and the retracting elastic element 320 is located within the elastic element receiving cavity 341, between the abutment boss 342 and the end of the second connecting sleeve 620 that extends into the elastic element receiving cavity 341.

[0076] As the travel rod 500 and travel sleeve 400 gradually transition from the screw-in feed transmission state to the idle limit state, the second connecting sleeve 620 gradually extends into the elastic element receiving cavity 341. The end of the second connecting sleeve 620 gradually approaches and abuts the boss 342. During this process, the retraction elastic element 320 is gradually compressed. When the travel rod 500 and travel sleeve 400 are completely in the idle limit state, it is the final compressed state of the retraction elastic element 320. At this time, under the pushing action of the retraction elastic element 320, the end of the external thread section 520 near the transmission section 510 can engage with the retraction starting end of the internal thread section 410. At this time, the power source drives the travel rod 500 to reverse, and the external thread section 520 rotates spirally in the internal thread section 410 and gradually moves away from the avoidance receiving section 420. During this process, the travel sleeve 400 can drive the connecting rod 600 and the tool 100 to gradually move away from the part to be drilled 10.

[0077] Continue to refer to Figures 3-6The cutting tool 100 has an arc-shaped cutting edge 110 arranged circumferentially, and the arc-shaped cutting edge 110 protrudes axially away from the connecting rod 600. That is, when the cutting tool 100 contacts the part to be drilled 10, the highest point of the arc-shaped cutting edge 110 contacts the part to be drilled, which is a point contact. As the cutting tool 100 gradually continues to press against the part to be drilled 10, the point contact gradually changes to a line contact. It can drill the part to be drilled 10 in a gradually cutting shearing manner. Compared with the punching drilling method, the above-mentioned pressing shearing method can reduce the power requirements of the power source. Compared with the drilling drilling method, the drilling quality and efficiency of the above-mentioned pressing shearing method are both higher.

[0078] Preferably, in this embodiment, there are two curved blades 110, which are arranged opposite each other along the diameter direction of the cross-section of the tool 100, so as to improve the uniformity of force on the part 10 to be drilled when drilling.

[0079] Continue to refer to Figure 1 and Figure 2 The mold 200 is C-shaped, and a backing part 210 is provided on one side of the opening of the mold 200. The cutting head of the cutter 100 and the backing part 210 can press and shear the part 10 to be opened on both sides respectively. The backing part 210 forms a support on the side of the part 10 to be opened away from the cutter 100, which prevents the part 10 to be opened from deforming when the cutter 100 presses and shears to open the part 10, thus ensuring the smooth progress of the opening process of the part 10 to be opened, and thus ensuring the opening effect.

[0080] It should be noted that the theoretical travel distance of the tool 100 during the hole-opening process is greater than the threaded distance between the travel rod 500 and the travel sleeve 400. In this embodiment, the theoretical travel distance is specifically the distance that the tool 100 needs to move from its fully retracted state to contact the abutment part 210. It is slightly greater than the threaded length of the internal thread section 410 and the external thread section 520. If the internal thread section 410 and the external thread section 520 are equal, the theoretical travel distance is greater than the lengths of the internal thread section 410 and the external thread section 520. If the lengths of the internal thread section 410 and the external thread section 520 are not equal, the theoretical travel distance is greater than the larger of the two. Through the above settings, the problem of the tool 100 bumping due to excessive feed distance during hole opening can be avoided.

[0081] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A hole-opening device, characterized in that, include: Connector, cutting tool (100), mold (200), and power source; The mold (200) is positioned on the part (10) to be drilled, and the cutting tool (100) is movably disposed in the mold (200); The connector includes an outer sleeve (300), a stroke sleeve (400), a stroke rod (500), and a connecting rod (600). The outer sleeve (300) is connected between the power source and the mold (200). The stroke sleeve (400) and the connecting rod (600) are coaxially connected and slidably disposed within the outer sleeve (300). The connecting rod (600) is connected to the cutting tool (100). The travel sleeve (400) is slidably disposed inside the outer sleeve (300), the travel rod (500) extends into the travel sleeve (400) and is connected to the power source, the power source can drive the travel rod (500) to rotate, the travel rod (500) and the travel sleeve (400) have sequentially performing screw-in feed transmission state, idle limit state and screw-in retraction transmission state; In the screw-in feed drive state, the stroke rod (500) rotates forward under the drive of the power source and drives the stroke sleeve (400) to move axially along the outer sleeve (300). Through the connecting rod (600), it pushes the tool (100) closer to and presses it into the part (10) to be drilled. In the idle limit state, the stroke rod (500) rotates in the stroke sleeve (400), the stroke sleeve (400) is stationary relative to the outer sleeve (300), and the position of the cutter (100) relative to the mold (200) remains unchanged; In the screw-connected retraction drive state, the tool (100) can move away from the part to be drilled (10) under the reverse rotation of the stroke rod (500).

2. The hole-opening device according to claim 1, characterized in that, The theoretical stroke distance of the cutting tool (100) during the hole-making process is greater than the screwing distance of the stroke rod (500) and the stroke sleeve (400).

3. The hole-opening device according to claim 1, characterized in that, The travel sleeve (400) is provided with an internal thread section (410) and a clearance and receiving section (420) in sequence along the axial direction near the connecting rod (600). The travel rod (500) is provided with a transmission section (510) and an external thread section (520) in sequence along the axial direction near the connecting rod (600). The transmission section (510) is connected to the output shaft of the power source. The stroke rod (500) rotates under the drive of the power source until the external thread section (520) and the internal thread section (410) are screwed together, which can drive the stroke sleeve (400) to move axially along the outer sleeve (300); The travel sleeve (400) can drive the cutter (100) to extend out of the mold (200) and approach the part (10) to be drilled through the connecting rod (600). When the cutter (100) rotates away from the internal thread section (410) on the external thread section (520) and fully extends into the relief and receiving section (420), it can perform pressure shearing and drilling on the part (10) to be drilled.

4. The hole-opening device according to claim 3, characterized in that, The outer sleeve (300) is provided with a feed elastic element (310), which is coaxially sleeved and connected to the transmission section (510) and abuts against the end of the stroke sleeve (400) away from the connecting rod (600). The external thread section (520) can engage with the feed start end of the internal thread section (410) under the pushing action of the feed elastic element (310).

5. The hole-opening device according to claim 3, characterized in that, The outer sleeve (300) is provided with a retraction elastic element (320), which is coaxially sleeved and connected to the connecting rod (600) and abuts against the inside of the outer sleeve (300) near the cutting tool (100). The external thread section (520) can engage with the retraction starting end of the internal thread section (410) under the pushing action of the retraction elastic element (320).

6. The hole-opening device according to claim 1, characterized in that, A first connecting sleeve (610) is coaxially fixed at the end of the connecting rod (600). The first connecting sleeve (610) is movably disposed in the mold (200) and connected to the cutting tool (100).

7. The hole-opening device according to claim 6, characterized in that, The first connecting sleeve (610) and the cutting tool (100) are detachably connected by a cutting tool screw (120). The mold (200) has a cutting tool through hole (220), and the cutting tool screw (120) can be exposed in the cutting tool through hole (220).

8. The hole-opening device according to claim 1, characterized in that, The travel sleeve (400) is provided with a receiving groove (430) on the outer peripheral side facing the inner wall of the outer sleeve (300), and the receiving groove (430) can accumulate lubricating oil.

9. The hole-opening device according to claim 1, characterized in that, The outer sleeve (300) has an oil injection hole (331) through which lubricating oil can be injected between the inner wall of the outer sleeve (300) and the outer peripheral side of the travel sleeve (400).

10. The hole-opening device according to claim 1, characterized in that, The connector also includes a bearing (700) disposed within the outer sleeve (300), and the stroke rod (500) is rotatably disposed within the outer sleeve (300) via the bearing (700).

11. The hole-opening device according to claim 1, characterized in that, The cutting tool (100) has an arc-shaped cutting edge (110) arranged circumferentially, and the arc-shaped cutting edge (110) protrudes in the axial direction of the cutting tool (100) in a direction away from the connecting rod (600).

12. The hole-opening device according to any one of claims 1-11, characterized in that, The mold (200) is C-shaped, and abutment (210) is provided on one side of the opening of the mold (200). The cutting head of the cutter (100) and the abutment (210) can press and shear the part (10) to be opened from both sides of the part (10) to be opened.

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