6h tap retrofit method and retrofit tap for machining 5g threads

Abstract

The present application relates to a kind of 6H tap retrofitting method and retrofitting tap for processing 5G thread, belong to special thread processing field;Select M10×1.5-6H general tap;The top of one tooth of tap is linear cutting in vertical direction, and cutting into rectangular groove;Cutting rectangular pad;The pad is vertically placed, and the two side walls of the bottom end of the pad are polished, and the polishing is wedge-shaped;The pad is hit into the recess, and the corresponding tooth is locally slightly deformed;The tap after retrofitting is loaded into machine tool, and the tapping is tested on test material, and the thread state is detected using 5G thread plug gauge;If the thread is unqualified, continue to adjust the tap, until the thread state meets the requirements;Tap retrofitting is completed;The present application solves the problem that there is no special tool under the condition of using general tool processing forming, and meets the design requirements;Save cost, the problem that production cycle is too long due to waiting tool is solved, and production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of special thread processing, and relates to a 6H tap modification method for processing 5G threads and a modified tap. BACKGROUND

[0002] For internal thread processing, tapping is an effective and commonly used processing method. As a continuous cutting process, the workpiece material is sequentially cut by the cutting edges, and the final thread size can be obtained by walking the tool one by one. The processing can be carried out on a numerical control milling machine or a lathe.

[0003] Since the diameter and pitch are fixed, one tap cannot process different specifications of screw holes. During processing, the rust prevention of the part in the later stage needs to be considered sometimes. When processing general threads, 6H is generally processed. If rust prevention is considered, the surface treatment of the part needs to be increased. The thread is first processed as 5G, the thread profile is larger than 6H, and after the surface treatment, the size of the part is detected by using a 6H thread plug gauge, and the product is considered qualified only when the requirements are met.

[0004] For the above-mentioned internal thread processing, the required 5G tap is not easy to purchase on the market, and generally a general 6H tap is used. Therefore, in the case of no corresponding tool, it is difficult to directly process the internal thread. SUMMARY

[0005] The technical problem solved by the application is to overcome the shortcomings of the prior art, and to provide a 6H tap modification method for processing 5G threads and a modified tap, which solves the problem of using a general tool for processing without special tools and meets the design requirements. The problem of long production cycle caused by waiting for tools is solved, and the production efficiency is improved.

[0006] The technical solution of the application is:

[0007] A 6H tap modification method for processing 5G threads, comprising:

[0008] Selecting a general M10x1.5-6H tap;

[0009] Linear cutting the top end of one tooth of the tap in the vertical direction to form a rectangular groove;

[0010] Cutting a rectangular pad;

[0011] Vertically placing the pad, and grinding the two side walls at the bottom end of the pad to form a wedge shape;

[0012] Putting the pad into the groove, the thickness of the pad is greater than the groove width, and the corresponding tooth is locally deformed by the pad;

[0013] The modified tap was installed into the machine tool, and tapping was performed multiple times on the sample. The thread condition was checked with a 5G thread plug gauge. If the thread was not up to standard, the tap was adjusted until the thread condition met the requirements.

[0014] The tap modification is complete.

[0015] In the above-mentioned method for modifying a 6H tap for machining 5G threads, the tap has a 3-tooth structure.

[0016] In the above-mentioned method for modifying a 6H tap for machining 5G threads, the groove has a depth of 15mm and a width of 0.3mm; the length of the groove is parallel to the outer wall of the corresponding tooth, and the width of the groove extends through the corresponding tooth.

[0017] In the above-mentioned method for modifying a 6H tap for machining 5G threads, the distance L1 between the groove and the corresponding tooth sidewall is 3mm.

[0018] In the above-mentioned method for modifying a 6H tap for machining 5G threads, the size of the shim is 10mm×6mm×0.4mm.

[0019] In the above-mentioned method for modifying a 6H tap for machining 5G threads, the height L2 of the wedge-shaped region is 6mm; the inclination angle of a single sidewall is 1°.

[0020] In the above-mentioned method for modifying a 6H tap for machining 5G threads, the top of the shim protrudes 2-3mm from the top of the tap.

[0021] In the above-mentioned method for modifying a 6H tap for machining 5G threads, the method for adjusting the tap is as follows:

[0022] Adjust the depth to which the shim is embedded in the groove.

[0023] A modified 6H tap for machining 5G threads includes a 3-tooth tap of type M10×1.5-6H and a washer; wherein, the tip of one tooth of the tap is cut with a groove in the vertical direction; and the washer is vertically embedded in the groove.

[0024] In the aforementioned 6H modified tap for machining 5G threads, the groove depth is 15mm and the groove width is 0.3mm; the length direction of the groove is parallel to the outer wall of the corresponding tooth, and the width of the groove extends through the corresponding tooth; the two side walls of the washer are ground into a wedge shape; after the washer is embedded in the groove, the top of the washer protrudes 2-3mm from the top of the tap.

[0025] The beneficial effects of this invention compared to the prior art are:

[0026] (1) The present invention solves the problem that, without special tools (cutters), general tools (cutters) are used for machining and forming to meet the design requirements. Cost is saved, and the problem of excessively long production cycles caused by waiting for tools is solved, thus improving production efficiency.

[0027] (2) The present invention processes the existing general "6H tap" by cutting grooves and adding gaskets in the grooves, causing slight deformation of the "6H tap" after extrusion to meet the requirements of the parts during processing.

[0028] (3) Through several tests to improve the dimensions, the present invention sets the groove depth of the groove to 15 mm. On the premise of meeting the tooth outward expansion, the bearing capacity of the root of the groove is ensured and it will not break easily. At the same time, the groove width is set to 0.3 mm. If it is too small, it is inconvenient for processing and increases the processing cost; if it is too large, it will affect the strength and toughness when the gasket is pounded in and is prone to fracture. The distance L1 between the groove and the corresponding tooth side wall is set to 3 mm. This is the optimal distance after debugging. On the premise of realizing micro deformation, by adjusting the height of the top of the gasket exposed from the top of the tap, the micro deformation can be controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the modification of the M10×1.5-6H general tap of the present invention;

[0030] Figure 2 It is a schematic diagram of the gasket of the present invention;

[0031] Figure 3 It is a schematic diagram of the alignment of the gasket of the present invention;

[0032] Figure 4 It is a schematic diagram of the installation of the gasket of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The present invention will be further described below in conjunction with embodiments.

[0034] The present invention provides a method for modifying a 6H tap and a modified tap for machining 5G threads. The tap is cut 15 mm downward from between two chip flutes by wire cutting (note not to cut the other two teeth of the tap), the groove width is about 0.3 mm, and then a 0.4 mm gasket (the size is pre-cut and qualified) is ground on both sides of the front end with a grinding wheel into a conical shape before being pounded into the cut groove. Do not use great force first to prevent the outer shape of the tap from being opened too large. Drill holes and tap threads with test materials, and test the threads with a 5G plug gauge. If the go gauge passes and the no-go gauge stops, the threads are qualified and the purpose is achieved.

[0035] A method for modifying a 6H tap for machining 5G threads specifically includes the following steps:

[0036] Select a M10×1.5-6H general tap 1; the tap 1 has a three-tooth structure, such asFigure 1 As shown.

[0037] A rectangular groove 2 is cut vertically at the tip of one tooth of tap 1. The groove 2 has a depth of 15 mm and a width of 0.3 mm. The length of the groove 2 is parallel to the outer wall of the corresponding tooth, and the width of the groove 2 extends through the corresponding tooth. The distance L1 between the groove 2 and the outer wall of the corresponding tooth is 3 mm. Figure 1 As shown.

[0038] Cut a rectangular prism-shaped shim 3. The dimensions of shim 3 are 10mm × 6mm × 0.4mm. The height L2 of the wedge-shaped region is 6mm. The inclination angle of one side wall is 1°. Figure 2 As shown.

[0039] Place the shim 3 vertically and grind the two side walls at the bottom of the shim 3 into a wedge shape, such as... Figure 2 As shown.

[0040] Align the gasket 3 with the groove 2 from top to bottom, as follows: Figure 3 As shown. The washer 3 is hammered into the groove 2. The thickness of the washer 3 is greater than the width of the groove 2. By expanding the groove 2 with the washer 3, local deformation of the corresponding tooth is caused; ensuring a tight fit, causing slight local deformation of the corresponding tooth; the top of the washer 3 protrudes 2-3mm from the top of the tap 1, as shown. Figure 4 As shown.

[0041] The modified tap 1 was installed into the machine tool, and tapping was tested multiple times on the sample. The thread condition was checked with a 5G thread plug gauge. If the thread was not up to standard, tap 1 was adjusted and the depth of the shim 3 embedded in the groove 2 was adjusted until the thread condition met the requirements.

[0042] The tap modification is complete.

[0043] 6H modified taps for machining 5G threads, such as Figure 4 As shown, it includes a 3-tooth tap 1 of type M10×1.5-6H and a washer 3; wherein, the tip of one tooth of the tap 1 cuts a groove 2 in the vertical direction; and the washer 3 is vertically embedded in the groove 2.

[0044] The groove 2 has a depth of 15mm and a width of 0.3mm; the length of the groove 2 is parallel to the outer wall of the corresponding tooth, and the width of the groove 2 extends through the corresponding tooth; the two side walls of the shim 3 are polished into a wedge shape; after the shim 3 is embedded in the groove 2, the top of the shim 3 protrudes 2-3mm from the top of the tap 1.

[0045] In this invention, the tap 1 is cut vertically downward by 15 mm from the top of one tooth using wire cutting (note not to cut the other two teeth of the tap). The groove width is about 0.3 mm. Then, a gasket with a thickness of 0.4 mm (the size is pre-cut to be qualified) is used. Before inserting it into the cut groove, the two sides of the front end are ground with a grinding wheel into a conical shape, and then it is pounded into the cut groove. Do not use excessive force first to prevent the tap from being overly opened in shape. Drill holes and thread tap with test materials, and use a 5G plug gauge to test the thread. If the go gauge passes and the no-go gauge stops, the thread is qualified and the purpose is achieved.

[0046] This invention realizes the processing and forming using general tools (cutters) without special tools (cutters) and meets the design requirements. It saves costs and solves the problem of an overly long production cycle caused by waiting for tools, thus improving production efficiency. It is a process of making the existing general "6H tap" undergo a cut groove treatment and adding a gasket in the cut groove, causing a slight deformation of the "6H tap" after extrusion and meeting the requirements of the parts after processing.

[0047] Although this invention has been publicly disclosed above with preferred embodiments, it is not used to limit this invention. Any person skilled in the art can make possible changes and modifications to the technical solution of this invention using the methods and technical contents disclosed above without departing from the spirit and scope of this invention. Therefore, any simple modifications, equivalent changes, and decorations made to the above embodiments based on the technical essence of this invention without departing from the technical solution of this invention all fall within the protection scope of the technical solution of this invention.

Claims

1. A method for modifying a 6H tap for machining 5G threads, characterized in that: include: A general-purpose tap of type M10×1.5-6H (1) was selected; the tap (1) has a 3-tooth structure; The tip of one of the teeth of the tap (1) is cut vertically to create a rectangular groove (2). The groove (2) has a groove depth of 15mm and a groove width of 0.3mm; the length direction of the groove (2) is parallel to the outer wall of the corresponding tooth, and the width of the groove (2) extends through the corresponding tooth; the distance L1 between the groove (2) and the outer wall of the corresponding tooth is 3mm. Cut a rectangular pad (3); The dimensions of the gasket (3) are 10mm × 6mm × 0.4mm; Place the gasket (3) vertically and grind the two side walls at the bottom of the gasket (3) into a wedge shape; the height L2 of the wedge area is 6mm; the inclination angle of a single side wall is 1°. The shim (3) is hammered into the groove (2). The thickness of the shim (3) is greater than the width of the groove (2). The shim (3) expands the groove (2), causing local deformation of the corresponding tooth. The top of the shim (3) protrudes 2-3 mm above the top of the tap (1); The modified tap (1) was installed into the machine tool and tapped multiple times on the sample. The thread condition was checked with a 5G thread plug gauge. If the thread was not qualified, the tap (1) was adjusted until the thread condition met the requirements. The method for adjusting tap (1) is as follows: Adjust the depth of the shim (3) embedded in the groove (2); The tap modification is complete.

2. The modified tap generated by the method for modifying a 6H tap for machining 5G threads according to claim 1, characterized in that: Includes a 3-tooth tap (1) of type M10×1.5-6H and a washer (3); wherein, the tip of one tooth of the tap (1) cuts a groove (2) in the vertical direction; and the washer (3) is vertically embedded in the groove (2).

3. The modified tap according to claim 2, characterized in that: The groove (2) has a groove depth of 15mm and a groove width of 0.3mm; the length direction of the groove (2) is parallel to the outer wall of the corresponding tooth, and the width of the groove (2) extends through the corresponding tooth; the two side walls of the gasket (3) are polished into a wedge shape; after the gasket (3) is embedded in the groove (2), the top of the gasket (3) protrudes 2-3mm from the top of the tap (1).

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