Welding tool assembly and tool manufacturing method

Abstract

The present invention provides a welding tool assembly and a method for manufacturing the tool, and belongs to the field of mechanical manufacturing. The tool assembly includes a carbide tool head, an alloy tool steel shank, and a special fixture, wherein the carbide tool head and the alloy tool steel shank are positioned and welded into an integrated structure by a special fixture. The manufacturing method of the welding tool includes four steps: rough machining of the carbide tool head, rough machining of the alloy tool steel shank, welding of the tool head and the shank by a special fixture, and overall finishing. The welding tool and assembly provided by the present invention have a simple structure, and the manufacturing method thereof can effectively ensure the welding quality of the tool head and the shank, so that the tool head and the shank have good coaxiality, greatly reduce the reserved margin for finishing, significantly improve the processing efficiency, and ensure product quality.

Description

Technical Field

[0001] The invention belongs to the field of mechanical manufacturing and relates to a welding tool assembly and a tool manufacturing method. Background Art

[0002] In aircraft manufacturing, with the increasing number of difficult-to-process materials, ordinary high-speed steel tools are gradually being replaced by carbide tools. However, some high-speed steel tools have a relatively small cutter head diameter and a relatively large shank diameter, or the shank has a special structure such as a lock-type quick-change shank. This type of tool is not suitable for being made into an integral carbide tool, and needs to be manufactured in the form of welding a carbide cutter head to an alloy tool steel shank. In the traditional method of manufacturing welding tools, the welding quality is poor, and the coaxiality of the cutter head and the shank after welding cannot be guaranteed. A large margin needs to be reserved for fine machining, which greatly reduces the machining efficiency. Based on the above problems, the present invention provides a method for manufacturing a welding tool, which can effectively improve the quality and production efficiency of the welding tool. Summary of the invention

[0003] In order to solve the problems of poor welding quality and low production efficiency in the traditional welding tool manufacturing method, the present invention provides a welding tool and a manufacturing method thereof, which can effectively improve the quality and production efficiency of the welding tool.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A welding tool assembly comprises a carbide tool head 1, an alloy tool steel tool handle 2, and a special fixture 3. The carbide tool head 1 and the alloy tool steel tool handle 2 are positioned and welded into an integrated structure through the special fixture 3.

[0006] The special clamp 3 includes a clamp body 3-1, an upper support ring 3-2, a lower support ring 3-3, an upper positioning sleeve 3-4, a lower positioning sleeve 3-5, and a fixed handle 3-6. The clamp body 3-1 is irregular in shape, and the main view is a "C"-shaped structure. The middle part of the clamp body 3-1 is hollowed out for the user to hold; the upper and lower ends are respectively provided with an upper support ring 3-2 and a lower support ring 3-3, and the upper and lower support rings 3-2 and 3-3 are coaxial on the vertical plane; the upper positioning sleeve 3-4 is arranged inside the upper support ring 3-2, and adopts a clearance fit, and the lower positioning sleeve 3-5 is arranged inside the lower support ring 3-3, and adopts a clearance fit; the fixed handle 3-6 is arranged at the lower part of the clamp body 3-1, and the bottom of the alloy tool steel handle 2 is fixed in the lower positioning sleeve 3-5 by rotating the fixed handle 3-6 when in use.

[0007] The head diameter of the cemented carbide cutter head 1 matches the upper positioning sleeve 3-4; the structure and size requirements of the cemented carbide cutter head 1 are as follows: one end of the cutter head is a blade, which has cutting teeth and a reasonable geometric angle to meet the cutting requirements, and the other end is cylindrical and matches the inner hole of one end of the handle with a fixed gap for welding.

[0008] The handle diameter of the alloy tool steel shank 2 matches the lower positioning sleeve 3-5; the structure and size requirements of the alloy tool steel shank 2 are as follows: one end of the shank part has an inner hole, which matches the fixed gap at the tail of the tool and has been welded, and the other end of the shank part is the matching part with the machine tool or the jacket.

[0009] Furthermore, the upper positioning sleeve 3-4 and the lower positioning sleeve 3-5 can be replaced according to the diameters of the tool head and the tool handle.

[0010] A method for manufacturing a welding tool includes rough machining of a carbide tool head 1, rough machining of an alloy tool steel tool handle 2, welding of the tool head and the tool handle, and overall fine machining. The specific steps are as follows:

[0011] The first step is rough machining of carbide tip 1

[0012] Cut the carbide bar to the required length, weld the false top on both sides, and align the center hole; grind the outer diameter to leave a 0.5mm margin, and control the tolerance within -0.03mm, and match it with the positioning sleeve 3-4 on the fixture during welding. Remove the false top on one side of the carbide bar to prepare for subsequent welding.

[0013] Step 2: Rough machining of alloy tool steel handle 2

[0014] Cut the alloy tool steel bar to the required length, turn and grind the outer diameter with a 0.5mm margin, drill and ream the end face welding hole, and make a 1×60° socket on the hole edge to prepare for subsequent welding. Turn the outer diameter of the lock card type quick change tool holder with a 0.6mm margin. Drill the exhaust hole of the welding hole. Mill the lock card type quick change tool holder groove. Roughly grind the outer diameter with a 0.5mm margin, and control the tolerance within -0.03mm, and match it with the positioning sleeve 3-5 under the fixture during welding.

[0015] The third step is welding the cutter head and the handle

[0016] A special fixture 3 is used to position the cutter head and the cutter handle. The function of the special fixture 3 is to ensure that the upper and lower positioning parts have good coaxiality, and a series of bushings can be made according to the different diameters of the cutter head and the cutter handle, which can be quickly replaced, saving time and manufacturing costs. During welding, the welding fixture is fixed on the high-frequency welding workbench with a bow-shaped clamp. Specifically: fix the fixture body 3-1 on the workbench; install the lower positioning sleeve 3-5 into the lower support ring 3-3, using a clearance fit; insert the bottom of the alloy tool steel handle 2 into the lower positioning sleeve 3-5, and fix it by rotating the fixed handle 3-6. Install the upper positioning sleeve 3-4 into the upper support ring 3-2, using a clearance fit, and insert the carbide cutter head 1 into the upper positioning sleeve 3-4. The carbide cutter head 1 and the alloy tool steel handle 2 are welded together by high-frequency welding, the welding temperature is 1100℃, the solder is H62, and the flux is borax.

[0017] Step 4: Overall finishing

[0018] Finely grind the outer circle of the blade to leave a 0.2mm margin; finely grind the outer circle of each part to size; use the CNC grinder to open the tooth groove and grind the tooth shape to size; finely grind the blade diameter to size. Remove the false center and passivate the cutting edge to complete the tool manufacturing.

[0019] The beneficial effects of the present invention are as follows: the welding tool provided by the present invention has a simple structure, and its manufacturing method can effectively ensure the welding quality of the tool head and the tool handle, so that the tool head and the tool handle have good coaxiality, greatly reduce the reserved margin for fine machining, significantly improve the machining efficiency, and ensure product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the welding tool structure;

[0021] Figure 2 This is a schematic diagram of a special fixture;

[0022] Figure 3 This is a structural diagram of a special fixture;

[0023] Figure 4 For along Figure 3 Cross-sectional view in the A direction;

[0024] Figure 5 For along Figure 3 Cross-sectional view in the B direction;

[0025] In the figure: 1 carbide tool head; 2 alloy tool steel handle; 3 special fixture; 3-1 fixture body; 3-2 upper support ring; 3-3 lower support ring; 3-4 upper positioning sleeve; 3-5 lower positioning sleeve; 3-6 fixed handle. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with specific embodiments.

[0027] The specific implementation steps of the manufacturing method of the welding tool are as follows:

[0028] Rough machining of carbide tip 1: Cut the carbide bar to the required length. Use 45# steel to turn two false tips, weld them to both ends of the carbide bar, and then align the center hole. Grind the outer diameter to leave a 0.5mm margin, and control the tolerance within -0.03mm, and match it with the positioning sleeve 3-4 on the fixture during welding. Remove the false tip on one side of the welding to prepare for welding.

[0029] Alloy tool steel handle 2 rough machining: Cut the alloy tool steel bar to the required length. Rough turn the outer circle with a 0.5mm allowance, drill and ream the end face welding hole, and make a 1×60° socket on the hole edge to prepare for welding. Turn around and clamp, align the flat end face, and make the center hole. Turn the outer diameter of the lock card type quick change handle with a 0.6mm allowance. Drill the exhaust hole for the welding hole. Mill the lock card type quick change handle groove. Rough grind the outer circle with a 0.5mm allowance, and control the tolerance within -0.03mm, and match it with the positioning sleeve 3-5 under the fixture during welding.

[0030] Welding of the cutter head and the handle: Use a special fixture 3 to fix the fixture body 3-1 on the workbench. Install the lower positioning sleeve 3-5 into the lower support ring 3-3, using the H7 / g6 clearance fit, insert the alloy tool steel handle 2 into the lower positioning sleeve 3-5, and rotate the fixing handle 3-6 to fix it. Install the upper positioning sleeve 3-4 into the upper support ring 3-2, using the H7 / g6 clearance fit, and insert the carbide cutter head 1 into the upper positioning sleeve 3-4. Weld the cutter head and the handle together by high-frequency welding, the welding temperature is 1100℃, the solder is H62, and the flux is borax.

[0031] Overall finishing: Grind the outer circle of the blade with a 0.2mm margin. Grind the outer circle of other parts to size. Grind the slot of the lock-type quick-change tool holder to size. Use the CNC grinder to open the tooth groove and front angle, grind the blade diameter to size, and select reasonable grinding parameters to grind the back angle to control the edge band. Remove the false top, chamfer, and passivate the edge to complete the tool manufacturing.

[0032] The above-described embodiments merely express the implementation methods of the present invention, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A method for manufacturing a welding tool, characterized in that: The method comprises four steps: rough machining of a carbide tool head (1), rough machining of an alloy tool steel tool handle (2), welding of the tool head and the tool handle, and overall finishing. The specific steps are as follows: The first step is rough machining of carbide tool head (1) Cut the carbide rod to the required length, weld false tops on both sides, and align the center hole; grind the outer diameter to leave a 0.5mm margin, and control the tolerance within -0.03mm, so that it can match the positioning sleeve (3-4) on the fixture during welding; remove the false top on one side of the carbide rod to prepare for subsequent welding; Step 2: Rough machining of alloy tool steel handle (2) Cut the alloy tool steel bar material to the required length, turn and grind the outer diameter to leave a 0.5mm margin, drill and ream the end face welding hole, and make a 1×60° groove on the hole edge to prepare for subsequent welding; turn the outer diameter of the locking card type quick change tool holder to leave a 0.6mm margin; drill the exhaust hole of the welding hole; mill the groove of the locking card type quick change tool holder; roughly grind the outer diameter to leave a 0.5mm margin, and control the tolerance within -0.03mm, so as to match with the positioning sleeve (3-5) under the fixture during welding; The third step is welding the cutter head and the handle A special fixture (3) is used to position the cutter head and the cutter handle. The function of the special fixture (3) is to ensure that the upper and lower positioning parts have good coaxiality. A series of bushings can be made according to the different diameters of the cutter head and the cutter handle, which can be quickly replaced, saving time and manufacturing costs. The fixture body (3-1) is irregular in shape, and the main view is a "C"-shaped structure. The middle part of the fixture body (3-1) is hollowed out for the user to hold. When welding, the welding fixture is fixed on the high-frequency welding workbench with a bow-shaped clamp. Specifically, the fixture body (3-1) is fixed to the high-frequency welding workbench. ) is fixed on a workbench; the lower positioning sleeve (3-5) is installed into the lower support ring (3-3) with a clearance fit; the bottom of the alloy tool steel shank (2) is inserted into the lower positioning sleeve (3-5) and fixed by rotating the fixing handle (3-6); the upper positioning sleeve (3-4) is installed into the upper support ring (3-2) with a clearance fit, and the carbide cutter head (1) is inserted into the upper positioning sleeve (3-4); the carbide cutter head (1) and the alloy tool steel shank (2) are welded together by high-frequency welding, the welding temperature is 1100°C, the welding material is H62, and the flux is borax; Step 4: Overall finishing Fine-grind the outer circle of the blade and leave a 0.2mm margin; fine-grind the outer circle of each part to size; use a CNC grinder to open the tooth groove and grind the tooth shape to size; fine-grind the blade diameter to size; remove the false center and passivate the cutting edge to complete the tool manufacturing.

2. The method for manufacturing a welding tool according to claim 1, characterized in that: The upper positioning sleeve (3-4) and the lower positioning sleeve (3-5) can be replaced according to the diameters of the tool head and the tool handle.

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