CN201960263U - Projection welding device for cap nut - Google Patents

Abstract

The utility model provides a projection welding device for cap nuts, which belongs to the technical field of welding. It solves the technical problems of low production efficiency and complicated welding devices existing in the prior art. The projection welding device of the cap nut includes an upper electrode arm and a lower electrode arm, an upper electrode clamp is fixed on the upper electrode arm, an upper electrode is connected to the lower end of the upper electrode clamp, and a The lower electrode holder, the lower electrode is connected to the upper end of the lower electrode holder, and the upper electrode can be in a position facing the lower electrode. The device also includes a nut sleeve for connecting the upper electrode and the cap nut. The device has simple structure, low production cost, manual welding, good versatility for various models, and high production efficiency for small-batch and multi-type cap nuts; the nut sleeve is more stable when it is sleeved on the cap nut through the concave cavity.

Description

Projection welding device for cap nut

technical field

The utility model belongs to the field of welding technology and relates to a projection welding device for cap nuts.

Background technique

Some places on some sheet metal parts on the car body need to use screws for positioning. Generally, cap nuts are fixed on the sheet metal parts to cooperate with the screws. The lower end of the cap nut is a flat plate, and the upper end of the nut is closed.

At present, the fixing methods between cap nuts and sheet metal parts mainly include welding and riveting. Generally speaking, welding methods are more common.

Generally, CO2 welding, spot welding and projection welding are used for welding between cap nuts and sheet metal parts. CO2 welding, this welding method has high cost, no quality assurance, and is prone to insufficient welding strength; welding slag, spatter damage internal threads, etc., affecting the assembly of the next process, low production efficiency, and inconvenient operation.

Spot welding is usually divided into two categories: double-sided spot welding and single-sided spot welding. During double-sided spot welding, the electrodes are fed from both sides of the workpiece to the weld. The typical double-sided spot welding method is the most commonly used method, when there are electrode indentations on both sides of the workpiece. The conductive plate with a large welding area is used as the lower electrode, which can eliminate or reduce the indentation of the workpiece below. Commonly used for spot welding of decorative panels. However, the production efficiency of spot welding is relatively low, not as high as that of projection welding.

Projection welding is to pre-process one or more protruding points on the bonding surface of a weldment, make it contact with the surface of another weldment, heat it with electricity, and then collapse it to make these contact points form solder joints. method.

Compared with spot welding, projection welding also has the following advantages:

1) Multiple solder joints can be welded simultaneously in one welding cycle. Not only is the productivity high, but there is no shunting effect. Therefore, solder joints can be arranged in narrow places without being limited by the dot pitch.

2) Since the current density is concentrated on the bump, the current density is high, so a small current can be used for welding, and a small nugget can be reliably formed. In spot welding, it is difficult to form a nugget smaller than a certain size corresponding to a certain plate thickness.

3) The position of the bump is accurate, the size is consistent, and the strength of each point is relatively uniform. Therefore, for a given strength, the size of the projection welding spot can be smaller than that of the spot welding.

4) Since a large flat electrode is used and the bumps are arranged on one workpiece, the indentation on the exposed surface of another workpiece can be minimized. At the same time, the current density of the large plane electrode is small, the heat dissipation is good, and the wear of the electrode is much smaller than that of spot welding, thus greatly reducing the maintenance and repair costs of the electrode.

5) Compared with spot welding, oil, rust, scale, plating and other coatings on the surface of the workpiece have less influence on projection welding, but a clean surface can still obtain a more stable quality.

The disadvantages of projection welding are the additional process of punching projection welding; the electrode is more complicated; because multiple solder joints are to be welded at a time, a high-power welding machine with high electrode pressure and high mechanical precision is required.

At present, for the on-site cap nut welding of the welding production line, because cap nuts are special nuts, the number used is relatively small, and there is no special projection welding electrode for projection welding, and temporary electrodes are used on site, so There is an urgent need for a projection welding device that can meet the requirements of projection welding, has low investment cost, quality assurance, and is easy to operate.

Contents of the invention

The purpose of the utility model is to provide a projection welding device for cap nuts with good versatility and high production efficiency for various vehicle types in view of the above-mentioned problems existing in the prior art.

The purpose of this utility model can be achieved through the following technical solutions: a projection welding device for cap nuts, including an upper electrode arm and a lower electrode arm, characterized in that an upper electrode clamp is fixed on the upper electrode arm , the lower end of the upper electrode holder is connected to the upper electrode, the lower electrode arm is fixed with the lower electrode holder, the upper end of the lower electrode holder is connected to the lower electrode, the The above-mentioned upper electrode can be in a position opposite to the lower electrode, and the device also includes a nut sleeve for connecting the upper electrode and the cap nut.

The working principle of this device is as follows: the upper electrode and the lower electrode are connected to the two poles of the power supply, the sheet metal part has a positioning hole, the sheet metal part is fixedly connected to the lower electrode, and then the cap nut is placed above the positioning hole on the sheet metal. Place the nut sleeve on top of the acorn nut and place the upper electrode on top of the nut sleeve. Then turn on the power supply, the two poles of the current reach the cap nut and the sheet metal part respectively through the upper electrode and the lower electrode, discharge occurs between the cap nut and the sheet metal part, and the edge of the lower end surface of the cap nut and the sheet metal part are melted , and then exert downward pressure on the nut sleeve, and the nut sleeve produces a downward force on the cap nut, welding the cap nut and the sheet metal together. The device has the advantages of simple structure, low production cost, manual welding, good versatility for various models, and high production efficiency for small batches and multiple types of cap nuts.

In the aforesaid projection welding device for cap nuts, the upper electrode holder and the lower electrode holder are rod-shaped, respectively pierced through the upper electrode arm and the lower electrode arm.

In the above-mentioned projection welding device for cap nuts, both the lower end of the upper electrode holder and the upper end of the lower electrode holder have axial concave holes, and the upper electrode and the lower electrode It is rod-shaped and can be inserted into the concave holes of the upper electrode holder and the lower electrode holder respectively. When the upper electrode or the lower electrode is worn out, the upper electrode or the lower electrode can be easily replaced.

In the above-mentioned projection welding device for cap nuts, the concave hole is a tapered hole, and one end of the upper electrode and one end of the lower electrode are both tapered. The tapered holes are easier to snap into each other.

In the above projection welding device for cap nuts, the upper end surface of the lower electrode has a boss one, and the upper end surface of the boss one has a boss two. The boss one abuts against the edge of the positioning hole of the sheet metal part, and the upper end of the boss two abuts against the cap nut.

In the above-mentioned projection welding device for cap nuts, the first boss and the second boss are arranged coaxially. A coaxial setup is easier to machine.

In the above-mentioned projection welding device for cap nuts, the lower end of the nut sleeve has an axial concave cavity, and the concave cavity can be sleeved on the cap nut. The nut sleeve is sleeved on the cap nut through the concave cavity to be more stable.

Compared with the existing technology, the device has simple structure, low production cost, manual welding, good versatility for various models, and high production efficiency for small batches and multiple types of cap nuts; the lower end of the upper electrode holder The upper end of the holder and the lower electrode holder are equipped with axial concave holes. When the upper electrode or the lower electrode is worn out, the upper electrode or the lower electrode can be easily replaced; the nut sleeve is sleeved on the cover through the concave cavity. It is more stable on the shape nut.

Description of drawings

Fig. 1 is a structural schematic diagram of the projection welding device of the cap nut.

Figure 2 is a schematic diagram of a nut sleeve.

Fig. 3 is a schematic diagram of the structure of the upper electrode.

Fig. 4 is a schematic diagram of the structure of the bottom electrode.

Fig. 5 is a schematic diagram of the structure of the cap nut.

In the figure, 1. upper electrode arm; 2. lower electrode arm; 3. upper electrode holder; 4. lower electrode holder; 5. upper electrode; 6. lower electrode; Taiwan two; 7, nut sleeve; 7a, cavity; 8, sheet metal parts; 9, cap nut.

Detailed ways

The following are specific embodiments of the utility model and in conjunction with the accompanying drawings, the technical solution of the utility model is further described, but the utility model is not limited to these embodiments.

As shown in Figure 1, Figure 2 and Figure 3, the projection welding device of the cap nut 9 includes an upper electrode arm 1 and a lower electrode arm 2, and an upper electrode holder 3 is fixed on the upper electrode arm 1, and the upper electrode holder The lower end of the holder 3 is connected with an upper electrode 5, the lower electrode arm 2 is fixed with a lower electrode holder 4, the upper end of the lower electrode holder 4 is connected with a lower electrode 6, and the upper electrode 5 can be connected with the lower electrode 6. in the right position. The upper electrode clamping part 3 and the lower electrode clamping part 4 are rod-shaped, respectively pierced on the upper electrode arm 1 and the lower electrode arm 2 . Both the lower end of the upper electrode holder 3 and the upper end of the lower electrode holder 4 have axial concave holes, and the upper electrode 5 and the lower electrode 6 are rod-shaped and can be inserted into the upper electrode holder 3 at one end respectively. And in the concave hole of the lower electrode holder 4. The concave hole is a tapered hole, and one end of the upper electrode 5 and one end of the lower electrode 6 are both tapered. The tapered holes are easier to snap into each other. When the upper electrode 5 or the lower electrode 6 is worn out, the upper electrode 5 or the lower electrode 6 can be easily replaced. The upper end surface of the lower electrode 6 has a boss one 6a, and the upper end surface of the boss one 6a has a boss two 6b. The first boss 6a abuts against the edge of the positioning hole of the sheet metal part 8 , and the upper end of the second boss 6b abuts against the cap nut 9 . Boss 1 6a and boss 2 6b are arranged coaxially, and the coaxial arrangement is easier to process.

As shown in FIGS. 4 and 5 , the device also includes a nut sleeve 7 for connecting the upper electrode 5 and the cap nut 9 . The lower end of the nut sleeve 7 has an axial cavity 7 a, which can be sleeved on the cap nut 9 . The nut sleeve 7 is sheathed on the cap nut 9 through the cavity 7a to be more stable. The working principle of this device is as follows: the upper electrode 5 and the lower electrode 6 are connected to the two poles of the power supply, the sheet metal part 8 has a positioning hole, the sheet metal part 8 is fixedly connected to the lower electrode 6, and then the cap nut 9 is placed on the sheet metal above the positioning hole. The nut sleeve 7 is placed above the cap nut 9 , and the upper electrode 5 is placed on the nut sleeve 7 . Then turn on the power supply, the two poles of the current reach the cap nut 9 and the sheet metal part 8 through the upper electrode 5 and the lower electrode 6 respectively, and discharge occurs between the cap nut 9 and the sheet metal part 8, and the edge of the lower end surface of the cap nut 9 The contact with the sheet metal part 8 melts, and then exerts downward pressure on the nut sleeve 7, and the nut sleeve 7 exerts a downward force on the cap nut 9, welding the cap nut 9 and the sheet metal part 8 together . The device has simple structure, low production cost, manual welding, good versatility for various models, and high production efficiency for small batches of cap nuts 9 with multiple models.

The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the utility model or go beyond the appended claims defined range.

Claims (7)

1. the projection welding device of an acorn nut, comprise upper electrode arm (1) and bottom arm (2), it is characterized in that, set firmly top electrode holder (3) on the described upper electrode arm (1), the bottom of described top electrode holder (3) is connected with top electrode (5), be installed with bottom electrode holder (4) on the described bottom arm (2), the upper end of described bottom electrode holder (4) is connected with bottom electrode (6), described top electrode (5) can and bottom electrode (6) be in over against the position, this device also comprises the ut socket (7) of be used to the to Connect Power utmost point (5) and an acorn nut (9).

2. the projection welding device of a kind of acorn nut according to claim 1 is characterized in that, described top electrode holder (3) and bottom electrode holder (4) are shaft-like, is located in respectively on upper electrode arm (1) and the bottom arm (2).

3. the projection welding device of a kind of acorn nut according to claim 2, it is characterized in that, the upper end of the bottom of described top electrode holder (3) and bottom electrode holder (4) all has axial shrinkage pool, and described top electrode (5) and bottom electrode (6) are shaft-like and can be plugged in the shrinkage pool of top electrode holder (3) and bottom electrode holder (4) by an end respectively.

4. the projection welding device of a kind of acorn nut according to claim 3 is characterized in that, described shrinkage pool is a bellmouth, and an end of an end of described top electrode (5) and bottom electrode (6) is all tapered.

5. according to the projection welding device of claim 1 or 2 or 3 or 4 described a kind of acorn nuts, it is characterized in that have boss one (6a) on the upper surface of described bottom electrode (6), the upper surface of described boss one (6a) has boss two (6b).

6. the projection welding device of a kind of acorn nut according to claim 5 is characterized in that, described boss one (6a) and the coaxial setting of boss two (6b).

7. according to the projection welding device of claim 1 or 2 or 3 or 4 described a kind of acorn nuts, it is characterized in that the lower end of described ut socket (7) has axial cavity (7a), described cavity (7a) can be set on the acorn nut (9).

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