A bore deburring tool

Abstract

The utility model provides a kind of hole deburring tool, belong to engine production technical field.It includes extension rod and connector, connector is arranged at the one end of extension rod, the one end of connector away from extension rod is provided with extruding head, and expansion slit extending to connector is opened on extruding head, the outer wall of extruding head forms the convex part of convex connector outer wall, and the two end edges of convex part are all equipped with tapered extruding surface.By extruding, extruding head is shrunk and then enters oil hole, after rotating extruding head comes to oil hole through place, extruding head elastically deforms and opens reset, and burr burr of extruding oil hole edge is made, and burr burr is stripped from oil hole intersection edge, and the edge of oil hole hole is effectively scraped by the edge of expansion slit on the extruding surface of rotating extruding head.Better effect of cleaning oil hole intersection through edge and hole wall burr burr.

Description

Technical Field

[0001] This utility model relates to the field of engine manufacturing technology, and in particular to a deburring tool for holes. Background Technology

[0002] Current engine blocks are generally cast from HT250 gray iron and machined to achieve the designed structural elements and a certain precision. The engine block has oil holes for the lubrication system, which are typically machined from the block body using a long drill bit. Burrs and flash are unavoidable at the intersections of these oil holes. Since the lubrication system downstream of the engine oil filter cannot tolerate impurities, otherwise it can cause cylinder scoring and bearing failure.

[0003] During processing, the usual methods for removing burrs and flash from the openings and walls of holes are chamfering and brushing with a wire brush. However, when removing burrs at the intersections of oil holes, the bristles of a regular wire brush are relatively soft. While the brush can deform the burrs during brushing, it cannot effectively scrape them off the workpiece. If the burrs and flash are not cleaned properly, it can easily cause cylinder scoring and bearing failure, resulting in unnecessary losses. Utility Model Content

[0004] In view of the above problems, this utility model provides a tool for deburring inside holes.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows: A tool for deburring holes is provided, including an extension rod and a connector. The connector is located at one end of the extension rod, and a pressing head is located at the end of the connector away from the extension rod. An expansion and contraction slit is formed on the pressing head, which runs through both sides of the pressing head and extends towards the connector. The outer wall of the pressing head forms a protrusion that protrudes from the outer wall of the connector. Both ends of the protrusion have tapered pressing surfaces.

[0006] Furthermore, the connector has symmetrically thinned zones on both sides of the expansion joint in the middle, and the expansion joint extends through the thinned zones.

[0007] Furthermore, a stress relief hole for relieving stress in the expansion joint is provided at the end of the extrusion head near the connector, and the stress relief hole penetrates through both sides of the extrusion head.

[0008] Furthermore, a wrench-shaped flat end is provided on the outer wall of the connector.

[0009] Furthermore, the connector and the extrusion part are integrally machined.

[0010] The beneficial effects of this utility model are as follows: When using an in-hole deburring tool to clean the burrs at the through-hole opening of an oil hole, the extrusion head is compressed and then enters the oil hole. After the rotating extrusion head reaches the through-hole, it opens and resets under the action of elastic force, extruding the burrs at the edges of the intersecting oil holes, causing the burrs to peel off from the intersection of the oil holes. The edges of the extrusion surface of the rotating extrusion head also effectively scrape off the burrs on the inner wall of the oil hole, achieving an effective cleaning effect of burrs at the intersection of the oil holes and on the hole wall. Attached Figure Description

[0011] Figure 1 This is a cross-sectional view of the deburring tool for holes according to Embodiment 1 of this application.

[0012] Figure 2 This is a cross-sectional view of the connector and extrusion head in Embodiment 2 of this application.

[0013] Figure 3 This is a cross-sectional view of the extrusion head 3 in Embodiment 3 of this application.

[0014] Figure 4 This is a cross-sectional view of the connector and extrusion head in Embodiment 3 of this application.

[0015] Among them, 1. extension rod; 2. connector; 21. thinning zone; 22. wrench flat end; 23. stress relief hole; 3. extrusion head; 31. protrusion; 32. extrusion surface; 33. positioning groove; 34. receiving cavity; 4. expansion joint. Detailed Implementation

[0016] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0017] Example 1 This application discloses a deburring tool for internal holes, as described in the embodiments below. Figure 1 The assembly includes an extension rod 1 and a connector 2. The connector 2 is connected to one end of the extension rod 1. An extrusion head 3 is connected to the end of the connector 2 away from the extension rod 1. An expansion joint 4 is formed on the end face of the extrusion head 3 away from the extension rod 1, passing through the extrusion head 3 and extending into the connector 2. A protrusion 31 protrudes from the outer wall of the connector 2 on the outside of the extrusion head 3. Both ends of the protrusion 31 have tapered extrusion surfaces 32. Specifically, the maximum diameter of the connector 2 should not exceed the diameter of the oil hole to be deburred, and the maximum circumscribed circle of the protrusion 31 on the extrusion head 3 should be larger than the diameter of the oil hole.

[0018] When using the tool, the worker squeezes and retracts the extrusion head 3, inserting it and the connecting head 2 into the oil hole on the engine block to be deburred. When the extrusion head 3 reaches the point where the oil hole is open, the extrusion head 3 and the connecting head 2 return to their original size under the elastic force of the connecting head 2, causing the protrusion 31 on the extrusion head 3 to expand out of the oil hole and into the oil passage. At the intersection of the oil holes, there is a local material loss in the hole wall. The extrusion head 3, which has lost some of the hole wall constraint, opens its head under the elastic force of itself and the connecting head 2, squeezing off the burrs at the intersection. The operation of rotating the extension rod 1 can be done manually by the worker, or by using a tool (such as a handle connected to the extension rod 1, or a power tool directly connected to the extension rod 1) to transmit rotational power to the extension rod 1. By using the forward and backward feed and rotating the connecting head 2 and the extrusion head 3, the extrusion surface 32 on the side of the extrusion head 3 closest to the extension rod 1 can contact the edge of the through end of the oil hole. The edges of the extrusion surface 32 at the expansion joint 4 are used to scrape away burrs from the through-hole opening of the oil hole. When the extrusion head 3 and the connecting head 2 are pulled out of the oil hole, the extrusion surface 32 guides and compresses the edge of the oil hole, allowing the extrusion head 3 to retract on its own and be pulled out of the oil hole.

[0019] In this embodiment, the connector 2 and the extrusion head 3 are integrally formed by machining. The deburring tool is made of wear-resistant and elastic steel, which can meet the deburring requirements of the current process.

[0020] Furthermore, thinning zones 21 can be symmetrically opened on both sides of the expansion joint 4 in the middle of the connector 2, with the expansion joint 4 extending through the thinning zones 21. By setting the thinning zones 21, the material on both sides of the expansion joint 4 can be thinned, improving the elasticity of the structure and further controlling the force required when the extrusion head 3 is extruded and deformed, making it easier for operators to operate.

[0021] Furthermore, a stress relief hole 23 is provided on the extrusion head 3 at one end of the expansion and contraction joint 4 near the connecting head 2. The stress relief hole 23 penetrates the side walls on both sides of the extrusion head 3. By providing the stress relief hole 23, the stress accumulation at the starting point of the expansion and contraction joint 4 during repeated deformation and recovery of the extrusion head 3 can be resolved, thereby improving the service life of the deburring tool.

[0022] Furthermore, the connector 2 can be detachably connected to the extension rod 1. In this embodiment, the connector 2 has a threaded hole at its end near the extension rod 1. The extension rod 1 can be made of metal, plastic, wood, or other materials. A stud adapted to the threaded hole is integrally fixed at the end of the extension rod 1 near the connector 2. The connector 2 and the extension rod 1 are detachably connected by threads. When the protrusion 31 on the extrusion head 3 wears due to repeated use, the operator can use a tool such as a metal chisel to insert it through the expansion joint 4, expanding the extrusion head 3 and connector 2 outwards to both sides until the extrusion head 3 and connector 2 deform. After expansion, the outer diameter of the protrusion 31 on the extrusion head 3 meets the usage requirements, thereby reducing the cost of tool use. When the wear of the protrusion 31 on the extrusion head 3 is beyond repair by "insertion", the connector 2 can be removed from the extension rod 1, and the entire deburring tool can be replaced. In other embodiments, the connector 2 and the extension rod 1 can also be connected by coaxial insertion or by countersunk bolts from the side.

[0023] Furthermore, a wrench-shaped flat opening 22 is provided on the outer wall of the connector 2. In this embodiment, the wrench-shaped flat opening 22 consists of two symmetrically arranged parallel surfaces. When workers disassemble and assemble the connector 2 and the extension rod 1, they can use pliers, wrenches, etc., to grip the wrench-shaped flat opening 22 for tightening and loosening operations, which is labor-saving and convenient. In other embodiments, the wrench-shaped flat opening 22 may also be configured with a quadrilateral or hexagonal cross-section.

[0024] Example 2 Reference Figure 2 The difference between Example 2 and Example 1 is that a conical positioning groove 33 is coaxially provided at the end of the extrusion head 3. The positioning groove 33 is specifically located on the end face of the extrusion head 3 away from the extension rod 1. When "plugging" the extrusion head 3 and the connector 2, a rod can be used and inserted axially along the connector 2 from the positioning groove 33. By using the inner wall of the positioning groove 33 to cooperate with the end of the rod, the extrusion head 3 on the periphery of the expansion and contraction joint 4 can be uniformly and symmetrically expanded outward, thereby improving the "plugging" repair effect of the extrusion head 3.

[0025] Example 3 Reference Figure 3 The difference between Example 3 and Example 1 is that the interior of the extrusion head 3 is hollow to form a receiving cavity 34. When the extrusion head 3 rotates in the oil hole to scrape off the burrs at the edge of the oil hole opening, some of the burrs are naturally drawn into the receiving cavity 34. This can reduce the situation where the burrs block the expansion and contraction gap 4, preventing the extrusion head 3 from naturally contracting when it is pulled out of the oil hole. After the extrusion head 3 is taken out of the oil hole, the burrs can be shaken off from the expansion and contraction gap 4 and cleaned out of the receiving cavity 34.

[0026] Those skilled in the art will understand that although preferred embodiments of the present invention have been described, those skilled in the art, once they understand the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention. Clearly, those skilled in the art can make various alterations and modifications to the present invention without departing from its spirit and scope. Thus, if these modifications and modifications of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and modifications.

Claims

1. A deburring tool for holes, characterized in that: The device includes an extension rod (1) and a connector (2). The connector (2) is located at one end of the extension rod (1). The end of the connector (2) away from the extension rod (1) is provided with an extrusion head (3). An expansion and contraction slit (4) is provided on the extrusion head (3) through both sides of the extrusion head and extending to the connector (2). The outer wall of the extrusion head (3) forms a protrusion (31) that protrudes from the outer wall of the connector (2). Both ends of the protrusion (31) are provided with tapered extrusion surfaces (32).

2. The deburring tool for holes according to claim 1, characterized in that, The connector (2) has a thinning zone (21) symmetrically opened on both sides of the expansion and contraction joint (4) in the middle, and the expansion and contraction joint (4) extends through the thinning zone (21).

3. The deburring tool for holes according to claim 1, characterized in that, The extrusion head (3) has a stress relief hole (23) at one end of the expansion joint (4) near the connector (2) for relieving stress in the expansion joint (4). The stress relief hole (23) penetrates the side walls of both sides of the extrusion head (3).

4. The deburring tool for holes according to claim 1, characterized in that, A wrench-shaped flat opening (22) is provided on the outer wall of the connector (2).

5. The deburring tool for holes according to claim 1, characterized in that, The connector (2) is integrally formed with the extrusion part.

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