Cold heading forming device for self-plugging rivet

Abstract

The utility model discloses a blind rivet cold heading forming device which comprises a main die head, a stamping die head and a radial tapping mechanism, and a plurality of rivet body forming grooves are formed in the main die head. A plurality of stamping die ejector rods are installed on the stamping die head, long through grooves are formed in the stamping die ejector rods, and the stamping die ejector rods are opposite to the rivet body forming grooves in position. Openings communicated with the rivet body forming groove are formed in the upper end and the lower end of the main die head, and the radial trepanning mechanism comprises an upper trepanning assembly and a lower trepanning assembly which are located at the upper opening and the lower opening of the main die head respectively; the upper punching assembly and the lower punching assembly are each provided with a strip-shaped punch and a punching air cylinder for driving the strip-shaped punch to stretch into the rivet body forming groove. The movable strip-shaped punches are arranged on the upper side and the lower side of the rivet body forming groove, the punching die ejector rod is provided with the through long groove, in the punching process of the punching die ejector rod, the strip-shaped punches are inserted into the long groove, the upper side and the lower side of the rivet body are perforated, the rivet body is formed at a time, machining steps of the rivet body are simplified, and production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of rivets, in particular to a cold heading forming device for blind rivets. Background Art

[0002] A blind rivet consists of a rivet body and a rivet core, and is a type of rivet for single-sided riveting. When riveting, the rivet core is pulled by a special riveting gun to expand the rivet body, playing a role in riveting. This type of rivet is particularly suitable for riveting occasions where it is inconvenient to use ordinary rivets (which require riveting from both sides), so it is widely used in products such as buildings, automobiles, ships, airplanes, machines, electrical appliances, furniture, etc. Among them, the open-type blind rivet is the most widely used. The circumferential surface of the rivet body of the open-type blind rivet is provided with multiple openings, which facilitate the rapid deformation of the rivet body during riveting to complete the fixing work.

[0003] At present, the processing of the rivet body is divided into two steps. The first step is cold heading processing by a cold heading device to obtain a hollow rivet body, and the second step is to open holes in the radial direction of the rivet body to obtain an open-type rivet body. Therefore, the existing processing steps of the rivet body are cumbersome and the processing efficiency is low. Summary of the Utility Model

[0004] In order to solve the above problems, the utility model provides a cold heading forming device for blind rivets, which can simultaneously complete cold heading and hole opening operations, improving the processing efficiency of the rivets.

[0005] Therefore, the technical solution of the utility model is: a cold heading forming device for blind rivets, including a main die head, a punching die head and a radial hole opening mechanism. A plurality of rivet body forming grooves are provided on the main die head; a plurality of punching die ejector rods are installed on the punching die head. A through long groove is provided on the punching die ejector rod, and the punching die ejector rod is opposite to the position of the rivet body forming groove.

[0006] Openings communicating with the rivet body forming grooves are provided at the upper and lower ends of the main die head. The radial hole opening mechanism includes an upper hole opening component and a lower hole opening component, which are respectively located at the upper and lower openings of the main die head; both the upper hole opening component and the lower hole opening component are provided with strip-shaped punches and hole opening cylinders for driving the strip-shaped punches to extend into the rivet body forming grooves.

[0007] On the basis of the above solution and as the preferred solution of the above solution: it further includes a material pushing mechanism, including a push rod mounting plate and a plurality of push rods. The push rods are located behind the rivet body forming grooves. The push rod mounting plate is arranged on a power driving mechanism, which can drive the push rods to extend into the rivet body forming grooves.

[0008] On the basis of the above solution and as the preferred solution of the above solution: the punching die ejector rod extends into the rivet body forming groove, and the long groove on the punching die ejector rod is opposite to the positions of the strip-shaped punches on both sides.

[0009] Based on the above solution and as a preferred solution to the above solution: A riveting body is provided in the riveting body forming groove. Under the action of the opening cylinder, the strip-shaped punch passes through the riveting body and inserts into the long groove of the die ejector rod, and radial holes are formed on both sides of the riveting body.

[0010] Based on the above solution and as a preferred solution to the above solution: The bottom end of the strip-shaped punch is a sharp opening part.

[0011] During use:

[0012] 1) In the initial state, the push rod is located on the outermost side, and the strip-shaped punches of the upper opening assembly and the lower opening assembly are located outside the riveting body forming groove;

[0013] 2) The riveting body blanks are sequentially placed into each riveting body forming groove, and the cold heading machine is started. The die head is driven by a power mechanism (such as a hydraulic cylinder, a common power source) to punch towards the main die head side;

[0014] 3) The riveting body blank is extruded and formed in the riveting body forming groove, and the die ejector rod is inserted into the riveting body blank to form a hollow structure of the riveting body;

[0015] 4) After the riveting body is formed, the upper opening assembly and the lower opening assembly start to punch holes in the radial direction of the riveting body. The opening cylinders on both sides simultaneously drive the strip-shaped punches to move towards the riveting body side. The strip-shaped punches pass through the riveting body and insert into the long groove of the die ejector rod, and radial holes are formed on both sides of the riveting body;

[0016] 5) After the radial opening is completed, the strip-shaped punches on both sides are reset and leave the riveting body;

[0017] 6) The die head moves outwards, so that the die ejector rod leaves the riveting body;

[0018] 7) The material pushing mechanism starts to work. The push rod mounting plate drives the push rod to insert into the riveting body forming groove under the action of a power driving mechanism (such as a hydraulic cylinder, a common power source), and pushes out the formed riveting body to complete the demolding.

[0019] Compared with the prior art, the beneficial effects of the present utility model are:

[0020] 1. Movable strip-shaped punches are provided on the upper and lower sides of the riveting body forming groove, and a through long groove is provided on the die ejector rod. During the die punching process of the die ejector rod, the strip-shaped punches are inserted into the long groove to perform hole opening treatment on the upper and lower sides of the riveting body, so that the riveting body is formed at one time, simplifying the processing steps of the riveting body and improving the production efficiency.

[0021] 2. A plurality of riveting body forming grooves are provided on the main die head, and multiple riveting bodies can be processed simultaneously, further improving the processing efficiency of the riveting body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a structural schematic diagram of the present utility model;

[0023] Figure 2 is a structural sectional view of the present utility model;

[0024] Figure 3 is Figure 2 a partial enlarged view of;

[0025] Figure 4 is a schematic diagram of the stamping state of the present utility model;

[0026] Figure 5 is a schematic diagram of the state of radial hole opening of the present utility model;

[0027] Figure 6 is a schematic diagram of the end state of radial hole opening of the present utility model;

[0028] Figure 7 is a schematic diagram of the demolding state of the present utility model;

[0029] Figure 8 is a schematic diagram of the structure of the strip punch of the present utility model.

[0030] The markings in the figure are: main die head 1, rivet body forming groove 11, opening 12, punching die head 2, punching die ejector rod 21, long groove 22, radial hole opening mechanism 3, upper hole opening assembly 31, lower hole opening assembly 32, upper strip punch 33, upper hole opening cylinder 34, lower strip punch 35, lower hole opening cylinder 36, hole opening part 37, material pushing mechanism 4, push rod mounting plate 41, push rod 42, rivet body 5, radial hole 51. Detailed implementation manners

[0031] In the description of the present utility model, it should be noted that for orientation terms, such as the terms "center", "transverse (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the indicated orientation and position relationship are based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present utility model.

[0032] In addition, for the terms "first" and "second", they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meanings of "several" and "a number of" are two or more, unless otherwise clearly and specifically defined.

[0033] Refer to the attached drawings. The cold heading forming device for blind rivets in this embodiment includes a main die head 1, a punching die head 2, a radial hole-opening mechanism 3, and a material pushing mechanism 4.

[0034] A plurality of rivet body forming grooves 11 are provided on the main die head 1, and a plurality of punching die ejector rods 21 are installed on the punching die head 2. A through long groove 22 is provided on the punching die ejector rod 21. The punching die ejector rod 21 is opposite to the rivet body forming groove 11 in position. The rivet body blank is placed in the rivet body forming groove 11 and can form a rivet body after being punched by the punching die head 2, while the punching die ejector rod 21 can punch out a hollow rivet body 5.

[0035] Openings 12 communicating with the rivet body forming grooves are provided at both the upper and lower ends of the main die head 1. The radial hole-opening mechanism 3 includes an upper hole-opening assembly 31 and a lower hole-opening assembly 32, which are respectively located at the upper and lower openings of the main die head 1. The upper hole-opening assembly 31 includes an upper strip punch 33 and an upper hole-opening cylinder 34 for driving the upper strip punch to extend into the rivet body forming groove. The lower hole-opening assembly 32 includes a lower strip punch 35 and a lower hole-opening cylinder 36 for driving the lower strip punch to extend into the rivet body forming groove. The bottom ends of the upper strip punch 33 and the lower strip punch 35 are both sharp hole-opening parts 37, and under the action of the cylinder, radial holes can be opened in the rivet body 5.

[0036] The punching die ejector rod 21 extends into the rivet body forming groove 11, and the long groove 22 on the punching die ejector rod 21 is opposite to the positions of the upper strip punch 33 and the lower strip punch 35. Under the action of the upper hole-opening cylinder 34 and the lower hole-opening cylinder 36, the upper strip punch 33 and the lower strip punch 35 pass through the rivet body and insert into the long groove of the punching die ejector rod, forming radial holes on both sides of the rivet body.

[0037] This embodiment further includes a material pushing mechanism 4, which includes a push rod mounting plate 41 and a plurality of push rods 42. The push rods 42 are installed on the push rod mounting plate 41. The push rods 42 are located behind the rivet body forming groove 11. The push rod mounting plate 41 is arranged on a power driving mechanism and can drive the push rods 42 to extend into the rivet body forming groove 11 to push the formed rivet body 5 out of the rivet body forming groove 11 to complete demolding.

[0038] During use:

[0039] 1) In the initial state, the push rod 42 is located at the outermost side, and the upper strip punch 33 and the lower strip punch 35 of the upper hole-opening assembly 31 and the lower hole-opening assembly 32 are located on the upper and lower sides of the rivet body forming groove 11 and do not extend into the rivet body forming groove 11.

[0040] 2) The rivet body blanks are sequentially placed into each rivet body forming groove 11, and the cold heading machine is started. The punching die head 2 is driven by a power mechanism (such as a common power source like a hydraulic cylinder) to punch towards the main die head 1 side.

[0041] 3) The rivet body blanks are extruded and formed in the rivet body forming groove 11, and the punching die ejector rod 21 is inserted into the rivet body blanks to form a hollow-structured rivet body 5.

[0042] 4) After the riveting body 5 is formed, the upper hole-opening assembly 31 and the lower hole-opening assembly 32 start to drill holes in the radial direction of the riveting body. The upper hole-opening cylinders 34 and 35 simultaneously drive the upper strip punch 33 and the lower strip punch 35 to move towards one side of the riveting body 5. The strip punches pass through the riveting body 5 and insert into the long slots 22 of the die ejector rod 21, forming radial holes 51 on both sides of the riveting body 5.

[0043] 5) After the radial opening is completed, the upper strip punch 33 and the lower strip punch 35 reset and leave the riveting body 5.

[0044] 6) The die head 2 moves outward, causing the die ejector rod 21 to leave the riveting body 5.

[0045] 7) The material pushing mechanism 4 starts to work. The push rod mounting plate 41 drives the push rod 42 to insert into the forming groove 11 of the riveting body under the action of a power driving mechanism (such as a common power source like a hydraulic cylinder), pushing out the formed riveting body 5 to complete the demolding.

[0046] The above is only the preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. A blind rivet cold heading forming device, characterized in that: It comprises a main die head, a punch die head and a radial hole opening mechanism, wherein the main die head is provided with a plurality of rivet body forming grooves; the punch die head is provided with a plurality of punch ejector pins, and the punch ejector pins are provided with a through long groove, and the punch ejector pins are opposite to the rivet body forming grooves; The upper and lower ends of the main die head are provided with openings connected to the rivet body forming groove, and the radial hole opening mechanism includes an upper hole opening component and a lower hole opening component, which are respectively located at the upper and lower openings of the main die head; the upper hole opening component and the lower hole opening component are both provided with a strip punch and a hole opening cylinder that drives the strip punch to extend into the rivet body forming groove.

2. A blind rivet cold heading forming device as claimed in claim 1, characterized in that: It also includes a pushing mechanism, including a push rod mounting plate and a plurality of push rods. The push rods are located behind the rivet body forming groove. The push rod mounting plate is arranged on a power driving mechanism and can drive the push rods to extend into the rivet body forming groove.

3. A blind rivet cold heading forming device as claimed in claim 1, characterized in that: The punching die push rod extends into the rivet body forming groove, and the long groove on the punching die push rod is opposite to the strip punches on both sides.

4. A blind rivet cold heading forming device as claimed in claim 3, characterized in that: A rivet body is arranged in the rivet body forming groove, and the strip punch is inserted into the long groove of the punching die push rod through the rivet body under the action of the hole opening cylinder, and radial holes are formed on both sides of the rivet body.

5. A blind rivet cold heading forming device as claimed in claim 1, characterized in that: The bottom end of the strip punch is a sharp hole opening portion.

Images