Finish machining combined tool for air valve guide pipe and valve seat of air cylinder head

Abstract

The utility model relates to a finish machining combined cutter for a valve guide pipe and a valve seat of a cylinder head, which is characterized by comprising a guide pipe reamer, a cutter base body and a cutter handle, the guide pipe reamer comprises a blade part and a base body connecting part, the blade part comprises a blade head and a blade rod which are connected into a whole, the blade rod is fixedly connected with the base body connecting part, and the cutter handle is fixedly connected with the blade head. The cutter base body is provided with a blade rod connecting hole and a reamer connecting inner hole which are coaxially arranged, the conduit reamer is matched and connected with the cutter base body, meanwhile, the base body connecting part is matched and in threaded connection with the reamer connecting inner hole, the blade rod is in Morse taper fit with the blade rod connecting hole, and the tail part of the cutter base body is detachably connected with the cutter handle. Radial deflection of the guide pipe reamer does not need to be adjusted, tool changing time is short, and efficiency is high.

Description

Technical Field

[0001] This utility model relates to a combination tool, specifically a combination tool for precision machining of cylinder head valve guides and valve seats. Background Technology

[0002] The valve guides and valve seats in the engine cylinder head are key machining points, and the machining requires high precision. Currently, the inner bores of the valve guides and valve seats are machined using a set of combined tools mounted on a machining center.

[0003] In existing technologies, a combined tool includes a tool base and a guide reamer mounted on the tool base. The tail of the guide reamer is a uniformly sized cylindrical rod that mates with the tool base via a shaft-hole joint. Finally, a clamping device ensures a tight fit between the guide reamer and the tool base. Because machining the valve guide inner bore is difficult and time-consuming, excessive wear on the guide reamer is easily caused, necessitating frequent replacements. Furthermore, the guide reamer is prone to loosening during machining, directly affecting the machining quality.

[0004] Furthermore, due to the existing structure of the guide reamer and the tool body being connected, after replacing the guide reamer, it is necessary to check the radial runout of the guide reamer on the tool setting instrument, and adjust it according to the runout direction. After adjustment, the check is repeated until the runout of the reamer tip meets the requirements. This results in a waste of working time, long tool replacement time, and low replacement efficiency. Summary of the Invention

[0005] The purpose of this utility model is to provide a precision machining combination tool for cylinder head valve guides and valve seats that does not require adjustment of the radial runout of the guide reamer, has a short tool change time, and is highly efficient.

[0006] To achieve the above objectives, the technical solution of this utility model is: a precision machining combination tool for cylinder head valve guides and valve seats, the innovation of which lies in: including a guide reamer, a tool body, and a tool holder.

[0007] The guide reamer includes a cutting edge and a base connecting part. The cutting edge includes a cutting head and a cutting shank that are integrally connected. The cutting shank is fixedly connected to the base connecting part.

[0008] The tool base has a coaxially arranged cutting shank connecting hole and a reamer connecting inner hole. The guide reamer is connected to the tool base. Simultaneously, the base connection part is threaded into the reamer connecting inner hole. The cutting shank is Morse taper-fitted into the cutting shank connecting hole.

[0009] The tail of the tool body is detachably connected to the tool holder.

[0010] In the above technical solution, the tool base has a nut inner hole arranged coaxially with the reamer connecting inner hole, and the nut inner hole is provided with a fastening nut that is threadedly connected to it. The thread at the tail of the base connection part is threadedly connected to the fastening nut to prevent the guide reamer from loosening.

[0011] In the above technical solution, the Morse taper of the connecting hole between the cutting rod and the cutting rod of the tool base is the same, and the Morse taper is 4 to 6°.

[0012] In the above technical solution, the cutting edge has multiple spiral-shaped cutting grooves.

[0013] In the above technical solution, the tool base is provided with a plurality of positioning grooves that cooperate with and connect with the valve seat tool on the outer periphery of the cutting rod connection hole. The plurality of positioning grooves are arranged along the circumferential direction of the tool base, and the valve seat tool is detachably connected to the tool base by radial fastening screws.

[0014] In the above technical solution, the cutting edge is a cemented carbide part, and the base connecting part is a steel part.

[0015] The positive effects of this utility model are: after adopting the precision machining combination tool for cylinder head valve guides and valve seats of this utility model, since this utility model includes a guide reamer, a tool base, and a tool holder,

[0016] The guide reamer includes a cutting edge and a base connecting part. The cutting edge includes a cutting head and a cutting shank that are integrally connected. The cutting shank is fixedly connected to the base connecting part.

[0017] The tool base has a coaxially arranged cutting shank connecting hole and a reamer connecting inner hole. The guide reamer is connected to the tool base. Simultaneously, the base connection part is threaded into the reamer connecting inner hole. The cutting shank is Morse taper-fitted into the cutting shank connecting hole.

[0018] The tail of the tool body is detachably connected to the tool holder.

[0019] Because the connection between the guide reamer and the tool base in this invention is a Morse taper fit—that is, the cutting shank and the cutting shank connecting hole are Morse taper fitted—this invention replaces the existing technology where the connection between the guide reamer and the tool base is a uniformly thick smooth shank structure. Therefore, during tool changes, there is no need to adjust the radial runout of the guide reamer, ensuring that the guide reamer runout is within the required range, i.e., the runout during machining the guide inner hole is within 0.004mm. This avoids the time wasted due to multiple adjustments and checks to ensure the guide reamer runout meets technical requirements.

[0020] Meanwhile, since the base connecting part of the guide reamer is fitted with the inner hole of the reamer and threaded, it replaces the existing technology that uses additional clamping parts to clamp the tool base to the guide reamer. This not only effectively prevents the guide reamer from loosening during machining, but also shortens the tool change time and improves the tool change efficiency. In addition, this utility model also has the advantages of simple structure and low cost. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of one specific embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the tool base of this utility model;

[0023] Figure 3 yes Figure 2 A side view diagram;

[0024] Figure 4 This is a schematic diagram of the structure of the conduit reamer of this utility model. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and the given embodiments, but it is not limited thereto.

[0026] like Figure 1 , 2 As shown in Figures 3 and 4, a finishing tool assembly for cylinder head valve guides and valve seats includes a guide reamer 1, a tool body 2, and a tool holder 3.

[0027] The guide reamer 1 includes a cutting edge 11 and a base connecting part 12. The cutting edge 11 includes a cutting head 111 and a cutting shank 112 that are integrally connected. The cutting shank 112 is fixedly connected to the base connecting part 12.

[0028] The tool base 2 has a coaxially arranged cutting shank connecting hole 21 and a reamer connecting inner hole 22. The guide reamer 1 is connected to the tool base 2. At the same time, the base connecting part 12 is connected to the reamer connecting inner hole 22 by thread. The cutting shank 112 is fitted with the cutting shank connecting hole 21 by a Morse taper.

[0029] The tail of the tool base 2 is detachably connected to the tool holder 3.

[0030] Furthermore, such as Figure 1As shown, to improve the firmness of the connection between the tool base and the guide reamer and prevent loosening, the tool base 2 has a nut inner hole 23 arranged coaxially with the reamer connecting inner hole 22, and the nut inner hole 23 is provided with a fastening nut 4 that is threadedly connected to it. The thread at the tail of the base connecting part 12 is threadedly connected to the fastening nut 4 to prevent the guide reamer from loosening. In the specific assembly process, the position of the fastening nut 4 in the nut inner hole 23 is adjusted by rotating the hexagonal hole on the fastening nut 4, thereby achieving axial fastening of the guide reamer.

[0031] Furthermore, in order to ensure the accuracy of the guide reamer after mating with the tool base, so that no adjustment of radial runout is required after replacing the guide reamer, the Morse taper of the cutting rod 112 and the cutting rod connecting hole 21 of the tool base 2 are the same, and the Morse taper is 4 to 6°.

[0032] Furthermore, such as Figure 4 As shown, in order to ensure the machining requirements of the inner hole of the guide tube, the cutting edge 11 has multiple spiral-shaped cutting grooves 113.

[0033] Furthermore, such as Figure 1 , 2 As shown in Figure 3, in order to enable the present invention to complete the machining of the valve seat inner hole, and to realize the rapid assembly of the valve seat tool and the tool base, and to effectively prevent the valve seat tool from loosening, the tool base 2 is provided with a plurality of positioning grooves 24 that cooperate with and connect to the valve seat tool 5 on the outer periphery of the cutting rod connecting hole 21. The plurality of positioning grooves 24 are arranged along the circumferential direction of the tool base 2. The valve seat tool 5 is detachably connected to the tool base 2 by radial fastening screws.

[0034] Furthermore, to simplify the manufacturing process and reduce costs, the guide reamer of this invention consists of two parts welded together. The cutting edge 11 is made of cemented carbide, for example, K20 cemented carbide. The base connecting part 12 is made of steel.

[0035] Because the connection between the guide reamer 1 and the tool base 2 in this invention is a Morse taper fit, meaning that the cutting shank 112 and the cutting shank connecting hole 21 are Morse taper fitted, this invention replaces the existing technology where the connection between the guide reamer 1 and the tool base 2 is a uniformly thick smooth shank structure. Therefore, during tool changes, there is no need to adjust the radial runout of the guide reamer, ensuring that the guide reamer runout is within the required range, i.e., the runout during machining the guide inner hole is within 0.004mm. This avoids the time wasted due to repeated adjustments and checks to ensure the guide reamer runout meets technical requirements.

[0036] Meanwhile, since the base connecting part 12 of the guide reamer 1 is engaged with the inner hole 22 of the reamer and threadedly connected, it replaces the existing technology that uses additional clamping parts to clamp the tool base to the guide reamer. This not only effectively prevents the guide reamer from loosening during machining, but also shortens the tool change time and improves the tool change efficiency. In addition, this utility model also has the advantages of simple structure and low cost.

[0037] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A finishing combination tool for cylinder head valve guide and seat, characterized by: It includes a conduit reamer (1), a tool body (2), and a tool holder (3). The conduit reamer (1) includes a cutting edge (11) and a base connecting part (12). The cutting edge (11) includes a cutting head (111) and a cutting shank (112) that are integrated together. The cutting shank (112) is fixedly connected to the base connecting part (12). The tool base (2) has a coaxially arranged cutting shank connecting hole (21) and a reamer connecting inner hole (22). The guide reamer (1) is connected to the tool base (2). At the same time, the base connecting part (12) is connected to the reamer connecting inner hole (22) by thread. The cutting shank (112) is fitted with the cutting shank connecting hole (21) by a Morse taper. The tail of the tool body (2) is detachably connected to the tool holder (3).

2. The cylinder head valve guide and seat finishing combination tooling of claim 1, wherein: The tool base (2) has a nut inner hole (23) arranged coaxially with the reamer connecting inner hole (22), and a fastening nut (4) is provided in the nut inner hole (23) and threadedly connected thereto. The thread at the tail of the base connecting part (12) is threadedly connected to the fastening nut (4) to prevent the guide reamer from loosening.

3. The cylinder head valve guide and seat finishing combination tooling of claim 1, wherein: The Morse taper of the cutting rod (112) and the cutting rod connecting hole (21) of the tool base (2) are the same, and the Morse taper is 4 to 6°.

4. The finishing combination tool for cylinder head valve guide and valve seat according to claim 1, characterized in that: The cutting edge (11) has multiple spiral-shaped cutting grooves (113).

5. The finishing combination tool for cylinder head valve guide and valve seat according to claim 1, characterized in that: The tool base (2) is provided with a plurality of positioning grooves (24) that cooperate with the valve seat tool (5) on the outer periphery of the cutting rod connection hole (21). The plurality of positioning grooves (24) are arranged along the circumferential direction of the tool base (2). The valve seat tool (5) is detachably connected to the tool base (2) by radial fastening screws (51).

6. The finishing combination tool for cylinder head valve guide and valve seat according to claim 1, characterized in that: The cutting edge (11) is made of cemented carbide, and the base connecting part (12) is made of steel.

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