Tool suitable for riveting supporting plate nut of thin-walled cylinder part

Abstract

The invention discloses a tool suitable for riveting a supporting plate nut of a thin-wall cylinder part. The tool is composed of a supporting plate nut positioning screw, a limiting block, a riveting head grinding tool, a supporting frame and a screw. The tool is simple in structure and easy to machine; the tool is used in cooperation with a press machine, and operability is high. The problems that when a traditional upper hammering riveting method and a static pressure riveting method are applied to the thin-walled cylinder structure, due to the fact that the operation space is limited, a riveting head inclines or the coaxiality between an inner thread of a supporting plate nut and a through hole of a riveted piece is out of tolerance are solved, and the quality and consistency of the riveting head are remarkably improved. And meanwhile, compared with a traditional hammering riveting method, the riveting mode is transformed from manual work to machine manual work, and the production efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical riveting and relates to a tool suitable for riveting a support plate nut of a thin-walled cylindrical part. Background Art

[0002] Thin-walled cylinder structures are often used in the external mechanical interfaces of photoelectric detection equipment. Generally, several support plate nuts are evenly distributed on the inner wall of the cylinder, and the support plate nuts are used to achieve installation and fixation with other equipment. For small and medium-sized photoelectric detection equipment, the inner diameter of the thin-walled cylinder is generally not greater than 200mm. In this case, the operating space is very limited when riveting the support plate nuts on the inner wall of the thin-walled cylinder. When the traditional hammer riveting method and static pressure riveting method are applied to such thin-walled cylinder structures, if the tooling design is improper, it is easy to cause the rivet head to be skewed or the coaxiality between the inner thread of the support plate nut and the through hole of the riveted part to be out of tolerance, resulting in low riveting qualification rate and frequent rework; in addition, the traditional hammer riveting method is inefficient and can no longer meet the needs of large-scale batch production. Summary of the invention

[0003] (I) Purpose of the invention

[0004] The purpose of the present invention is to provide a tool suitable for riveting support plate nuts of thin-walled cylindrical parts, so as to solve the problems of poor consistency, low pass rate and low efficiency of riveting support plate nuts of thin-walled cylindrical parts in mass production.

[0005] (II) Technical solution

[0006] In order to solve the above technical problems, the present invention provides a tool suitable for riveting support plate nuts of thin-walled cylindrical parts, which includes: support plate nut positioning screws, riveting head molds, limit blocks, support frames, and support plate nuts; thin-walled cylindrical parts are recorded as riveted parts, radial through holes are opened on the cylinder wall of the riveted parts, limit blocks are arranged on the outer wall surface of the cylinder wall, through holes are opened on the limit blocks, and the support plate nut positioning screws pass through the radial through holes and the through holes in sequence and are connected to the support plate nut on the inner wall surface of the cylinder wall; a riveting head mold is arranged on the support frame, and the support plate nut is positioned on the riveting head mold.

[0007] Among them, two positioning holes are provided on the support plate nut positioning screw, the riveted part tube wall and the support plate nut, and the support plate nut positioning screw, the riveted part tube wall and the support plate nut are positioned by two rivets.

[0008] Among them, the support plate nut positioning screw is composed of, from top to bottom: a head, a positioning cylindrical surface section, a cylindrical surface section and a threaded section. The positioning cylindrical surface section cooperates with the limit block, the cylindrical surface section is positioned with the riveted part, and the threaded section is used to fasten with the support plate nut.

[0009] Among them, the riveting head mold adopts a step design, the back step is overlapped on the support frame, and the front step is positioned in conjunction with the support plate nut.

[0010] Among them, the step surface of the front step of the riveting head mold is an arc surface, and the arc surface is provided with a riveting head forming groove and a support plate nut placement hole, and the support plate nut is placed in the support plate nut placement hole.

[0011] Among them, the shape and position dimensions of the riveting head forming groove are calculated according to the rivet specifications and compression amount; the azimuth angle value θ of the riveting head forming groove is matched and designed according to the size of the riveted parts and the hole spacing and deflection angle of the support plate nut after fitting and bending, that is, L / θ=2πR / 360°, where L is the hole spacing of the rivet holes of the support plate nut, and R=tooling radius + 1 / 2 support plate nut thickness value.

[0012] Among them, the limit height of the limit block and the limit height of the riveting head mold are designed to match, that is, the total height value of the riveting tooling base = the radius of the tooling arc surface + the thickness of the flange ear of the support plate nut + the thickness of the wall tube of the riveted part + the center height of the limit block, and the flange ear of the support plate nut matches the arc surface of the inner wall of the riveted part.

[0013] When the tooling is in use, the support frame is fixed on the press operating table, and the riveted head mold is fixed on the support frame, and the two are positioned through the step fitting surface; the riveted parts and the support plate nuts are connected in series with rivets; after the limit block is installed, the limit block, the support plate nut, the rivet and the riveted parts are fixed together with the support plate nut positioning screw at the same time, and the positioning is performed by fitting the side end face of the limit block with the riveted parts; the assembled components are placed on the riveted head mold; the press flange is rotated or electrically controlled to sink, and the pressure punch slowly descends to squeeze the limit block until the pressure punch contacts the upper surface of the riveted head mold; the press flange is rotated in the opposite direction, the stamping mechanism is withdrawn, the limit block is removed, and the riveted parts are removed, and the riveting is completed.

[0014] (III) Beneficial effects

[0015] The tooling provided by the above technical solution, which is suitable for riveting support plate nuts of thin-walled cylindrical parts, overcomes the problems of rivet head tilt or coaxiality deviation between the internal thread of the support plate nut and the through hole of the riveted part, which is easily caused by the limited operating space when riveting support plate nuts on the inner wall of thin-walled cylinders. It significantly improves the product qualification rate and the consistency of product riveting. This tooling is used in conjunction with a press to replace the traditional hammer riveting method, realizing the transformation of riveting methods from manual to machine, greatly reducing the difficulty of operation and significantly improving the riveting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the tooling structure of the present invention.

[0017] Figure 2This is a schematic diagram of an application scenario of the present invention.

[0018] Figure 3 for Figure 2 A partial enlarged view of the . DETAILED DESCRIPTION

[0019] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples.

[0020] Reference Figures 1 to 3 As shown, this embodiment is applicable to tooling for riveting support plate nuts of thin-walled cylindrical parts, including support plate nut positioning screws, riveting head molds, limit blocks, support frames, and support plate nuts; thin-walled cylindrical parts are recorded as riveted parts, radial through holes are opened on the cylinder wall of the riveted parts, limit blocks are arranged on the outer wall surface of the cylinder wall, through holes are opened on the limit blocks, and the support plate nut positioning screws pass through the radial through holes and the through holes in sequence and are connected with the support plate nut on the inner wall surface of the cylinder wall; a riveting head mold is arranged on the support frame, and a forming groove is opened on the riveting head mold, and the lower end of the support plate nut is embedded in the forming groove to realize the positioning of the riveted parts on the riveting head mold.

[0021] Two positioning holes are arranged on the support plate nut positioning screw, the riveted part cylinder wall and the support plate nut, and the support plate nut positioning screw, the riveted part cylinder wall and the support plate nut are positioned by two rivets.

[0022] The support nut positioning screw is different from traditional ordinary screws. In addition to the threaded structure, it is also designed with a positioning cylindrical surface. When used in conjunction with the limit block, it can achieve fixation and precise position control between the support nut and the riveted part. The thread is used to fasten the support nut, and the cylindrical surface is used to position the riveted part.

[0023] The riveting head mold adopts a step design, which overcomes the structural space limitations of the riveted parts and realizes the transfer of the riveting force point from the inside to the outside.

[0024] The riveting head mold has a riveting head forming groove and a support plate nut placement hole on the arc surface. The shape and position dimensions of the riveting head forming groove are calculated according to the rivet specifications and compression amount; the azimuth angle value θ of the riveting head forming groove is designed to match the size of the riveted parts and the hole spacing and deflection angle of the support plate nut after fitting and bending, that is, L / θ=2πR / 360°, where L is the hole spacing of the support plate nut rivet hole, and R=tooling radius + 1 / 2 support plate nut thickness value. The above measures ensure the dimensional accuracy of the riveting head.

[0025] The limit height of the limit block is designed to match the limit height of the riveting head mold, that is, the total height of the riveting tooling base = the radius of the tooling arc surface + the thickness of the flange ear of the support plate nut + the thickness of the wall tube of the riveted part + the center height of the limit block. In addition to fixing the support plate nut and the riveted part, the main function of the limit block is to control the descent height of the press punch, thereby controlling the deformation of the riveting head and ensuring the consistency of the riveting head.

[0026] The present invention is suitable for riveting the support plate nuts of thin-walled cylindrical parts. When in use, the support frame is fixed on the operating table of the press machine, and the riveting head mold is fixed on the support frame, and the two are positioned by the step fitting surface; the riveted part and the support plate nut are connected in series by rivets; after the limit block is installed, the limit block, the support plate nut, the rivet and the riveted part are fixed together by the support plate nut positioning screw at the same time, and the positioning is performed by fitting the side end face of the limit block with the riveted part; the component assembled in the previous step is placed on the riveting head mold; the press flange is rotated or electrically controlled to sink, and the pressure punch slowly descends to squeeze the limit block until the pressure punch contacts the upper surface of the riveting head mold; the press flange is rotated in the opposite direction, the stamping mechanism is withdrawn, the limit block is removed, and the riveted part is removed, and the riveting is completed.

[0027] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A tool suitable for riveting the support plate nuts of thin-walled cylindrical parts, characterized in that: include: Support plate nut positioning screw, riveting head grinder, limit block, support frame, support plate nut; Thin-walled cylindrical parts are recorded as riveted parts. A radial through hole is opened on the cylinder wall of the riveted parts. A limit block is arranged on the outer wall of the cylinder wall. A through hole is opened on the limit block. The support plate nut positioning screw passes through the radial through hole and the through hole in sequence and is connected to the support plate nut on the inner wall of the cylinder wall; a riveting head mold is set on the support frame, and the support plate nut is positioned on the riveting head mold.

2. The tooling for riveting the support plate nuts of thin-walled cylindrical parts as claimed in claim 1 is characterized in that: Two positioning holes are arranged on the support plate nut positioning screw, the riveted part cylinder wall and the support plate nut, and the support plate nut positioning screw, the riveted part cylinder wall and the support plate nut are positioned by two rivets.

3. The tooling for riveting the support plate nuts of thin-walled cylindrical parts as claimed in claim 2 is characterized in that: The support plate nut positioning screw consists of, from top to bottom: a head, a positioning cylindrical surface section, a cylindrical surface section and a threaded section. The positioning cylindrical surface section cooperates with the limit block, the cylindrical surface section is positioned with the riveted part, and the threaded section is used to fasten with the support plate nut.

4. The tooling for riveting the support plate nuts of thin-walled cylindrical parts as claimed in claim 3 is characterized in that: The riveting head mold adopts a step design, the back step is overlapped on the support frame, and the front step is positioned in conjunction with the support plate nut.

5. The tooling for riveting the support plate nuts of thin-walled cylindrical parts as claimed in claim 4 is characterized in that: The step surface of the front step of the riveting head mold is an arc surface, and a riveting head forming groove and a support plate nut placement hole are opened on the arc surface, and the support plate nut is placed in the support plate nut placement hole.

6. The tooling for riveting the support plate nuts of thin-walled cylindrical parts as claimed in claim 5 is characterized in that: The shape and position dimensions of the riveting head forming groove are calculated according to the rivet specifications and compression amount; the azimuth angle value θ of the riveting head forming groove is designed and matched according to the size of the riveted parts and the hole spacing and deflection angle of the support plate nut after fitting and bending, that is, L / θ=2πR / 360°, where L is the hole spacing of the rivet holes of the support plate nut, and R=tooling radius + 1 / 2 support plate nut thickness value.

7. The tooling for riveting thin-walled cylindrical parts support plate nuts as claimed in claim 6, characterized in that: The limit height of the limit block is designed to match the limit height of the riveting head mold, that is, the total height of the riveting tooling base = the radius of the tooling arc surface + the thickness of the flange ear of the support plate nut + the thickness of the wall tube of the riveted part + the center height of the limit block, and the flange ear of the support plate nut matches the arc surface of the inner wall of the riveted part.

8. The tooling for riveting the support plate nuts of thin-walled cylindrical parts as claimed in claim 7 is characterized in that: When the tooling is in use, the support frame is fixed on the press operating table, and the riveting head mold is fixed on the support frame, and the two are positioned by the step fitting surface; the riveted parts and the support plate nuts are connected in series with rivets; after the limit block is installed, the limit block, the support plate nut, the rivet and the riveted parts are fixed together with the support plate nut positioning screw at the same time, and the positioning is performed by fitting the side end face of the limit block with the riveted parts; the assembled components are placed on the riveting head mold; the press flange is rotated or electrically controlled to sink, and the pressure punch slowly descends to squeeze the limit block until the pressure punch contacts the upper surface of the riveting head mold; the press flange is rotated in the opposite direction, the stamping mechanism is withdrawn, the limit block is removed, and the riveted parts are removed, and the riveting is completed.

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