RU214264U9 - Drilling machine for drilling holes in parts such as U- and U-brackets - Google Patents

Abstract

The utility model relates to special-purpose drilling machines and can be used for drilling holes in parts such as U- and U-shaped brackets. The machine tool contains a system with numerical control, a fixed frame with a ball screw pair, the first drilling unit and the second drilling unit, mounted with the possibility of moving along the frame relative to the first one by means of a stepper motor with a specified distance between the spindle axes. The first drilling unit is fixed from longitudinal movement. Each drilling unit contains a spindle, a servomotor, a ball screw pair and an electric motor for driving drills, and an installation fixture. Each spindle is movable across the frame by said servomotor to ensure processing according to a given algorithm. Each setting device is made with a hole for the passage of the end of the workpiece to ensure its clamping by means of a pneumatic cylinder. The productivity of labor increases, the ingress of non-conforming products to the subsequent stages of processing and to the consumer is excluded. 3 ill.

Description

The utility model relates to special-purpose drilling machines and can be used for one-sided drilling of holes located in the same plane in parts having a round cross section.

Known multi-spindle groove drilling machine for wood, including several spindles with drills installed in them, a device for fixing the part and a control device (AS USSR No. 23859, publ. 10/31/1931). According to a well-known solution, the spindles are placed and fixed in a common structural element for them, called the fixed board by the authors. Processing of the part occurs with the simultaneous rotational movement of the drills and the oncoming movement of the drills and the part. The feed rate is set when setting up the machine. The control of a known device involves the presence of a special disk with contacts and a handle, for which the operator must rotate the disk, connecting and disconnecting the contacts of the electrical circuits for supplying power to the machine's electric motors in series.

The disadvantages of the known solution include the impossibility of using it without replacing the fixed board for drilling parts with a different distance between the axes of the holes being machined. In addition, the disadvantages include the need for the constant presence of the operator during processing, associated with manual control of the process.

Known automatic machine for drilling holes, countersinking chamfers and threading, including a multiposition table with means of fixing parts and several spindles made in the form of drilling, countersinking and threading heads (AS SU 1166966, publ. 15.07.1985. Bull. No. 26 ). According to the well-known solution, the multi-position table is made rotary, and the processing of parts occurs sequentially at each position.

The disadvantages of the known solution include the complexity of the design of the device, associated with the need to ensure the rotation of the multi-position table, as well as the need to process one part in three different positions, which increases the operating time of processing.

It is known that modern metalworking machine tools with numerical control (hereinafter referred to as CNC) can have so-called servo systems. In most cases, this implies copier processing, but in some cases it can be about scanning the surface of the workpiece directly being processed (see, for example, URL:/ https://cnemodelist.ru/stati/rabota-so-stankom-instrumentami- prisposobleniyami/scanirovanie-poverkhnosti-zagotovkj.html (date of access: 07/18/2022)). However, such systems are highly complex, often require special software and, accordingly, are expensive.

The closest in terms of the set of essential features - the prototype of the claimed utility model - is a multi-purpose drilling-milling-boring machine with CNC and automatic tool change, including a fixed bed, a slide moving along the bed using a ball screw pair, a spindle and a control system (US Pat. RU 13628, published on May 10, 2000). According to a well-known solution, the transmission of motion along all axes is carried out by means of rolling screw-nut gears on linear rolling guides. Two tables are attached to the fixed frame. The workpiece is machined using a single headstock. All drives are controlled by the CNC system. A known solution provides for automatic tool change using an integrated tool magazine.

The disadvantages of the known solutions include its lack of efficiency in mass production, due to the presence of a single spindle and an automatic tool change system with a tool magazine. In the conditions of continuous production, a tool change may be required, mainly when it is worn out, and the absence of a second spindle reduces the productivity of the equipment.

The technical problem to be solved by the proposed utility model is the creation of a CNC drilling machine with the function of a control device oriented to the conditions of in-line production.

The technical result of the implementation of this utility model is the exclusion of non-conforming products from entering the subsequent stages of processing and, ultimately, to the consumer.

The set technical problem is solved through the combined application of the following technical solutions:

fixing the first drilling unit from longitudinal movement,

adding to the design of the second drilling unit, installed with the possibility of moving along the frame relative to the first drilling unit by means of a stepper motor with a specified distance between the axes of the spindles,

the use of a spindle, a servo motor, a ball screw pair, an electric motor for driving drills and an installation device in the design of each drilling unit,

installation of each spindle with the ability to move across the frame by means of a servo motor, ensuring that the part is processed according to a given algorithm,

making a hole in each setting device for the passage of the end of the workpiece, ensuring that the end of the workpiece is clamped by means of a pneumatic cylinder.

Proposed as a real utility model drilling machine is illustrated by drawings (Fig. 1, 2, 3). In FIG. 1 shows a general view of the drilling machine, where the bed 1, the drilling units 2, the CNC system 3 are indicated. FIG. 2 shows a drilling assembly 2. FIG. 3 shows the proposed drilling machine with part 4 installed in it for processing.

Drilling units 2 include spindles 21, servomotors 22, ball screws 23, electric motors 24 for driving drills 25, installation fixtures 26. Installation fixtures 26 include holes 261 for setting the ends of the workpiece 4 (see Fig. 3). The clamping of the workpiece 4 is carried out using pneumatic cylinders 262.

The first drilling unit 2 is fixed from longitudinal movement. The second drilling unit is mounted on a ball screw pair with the possibility of longitudinal movement using a stepper motor (not shown conventionally in Fig.).

Proposed as a real utility model drilling machine operates as follows.

The operator selects on the control panel (not shown in Fig. conditionally) the desired processing program, loaded into the CNC 3 earlier, or sets the center distance and presses the start of the program. The second drilling unit 2 is moved by means of a stepper motor to the desired position relative to the first drilling unit 2, that is, to a predetermined distance.

The operator sets the ends of the workpiece into the holes 261 of the mounting fixtures 26.

An important distinguishing feature of the proposed drilling machine is the possibility of its use as a control device when processing parts such as U- and U-shaped brackets. After setting the second drilling unit 2 to the desired position, the drilling units 2 form a caliber, which can be used to check the conformity of parts such as U- and U-shaped brackets according to the "center distance" parameter. Parts 4 that cannot be installed in the holes 261 of the mounting fixtures 26 are not suitable, their further processing is impractical. Thus, the use of the proposed drilling machine provides one hundred percent technical control of workpieces 4 without organizing an additional workplace and without spending time and money to carry it out. This helps to prevent nonconforming products from entering the subsequent processing operations and, ultimately, to the consumer.

If the part 4 was installed in the holes 261, the operator gives the command to start processing.

There is a clamping of the workpiece by 4 pneumatic cylinders 262, at the same time the electric motors 24 are turned on. The servomotors 22 begin to move the spindles 21 according to a given algorithm.

After processing is completed in accordance with the program embedded in the CNC system 3, the servomotors 22 retract the spindles 21 from the setting devices 26. The pneumatic cylinders 262 are released. The operator removes part 4 from holes 261. The processing cycle is completed.

Claims (1)

Drilling machine for drilling holes in parts of the U- and U-shaped brackets, containing a fixed frame with a ball screw pair, the first drilling unit and a numerical control system, characterized in that it is equipped with a second drilling unit installed with the ability to move along of the frame relative to the first drilling unit by means of a stepper motor providing a predetermined distance between the axes of the spindles, while the first drilling unit is fixed from longitudinal movement, and each drilling unit contains a spindle, a servo motor, a ball screw pair and an electric motor for driving drills and an installation fixture, each the spindle is movable across the bed by said servomotor to ensure processing according to a given algorithm, and each setting device is made with a hole for passing the end of the workpiece to be clamped by means of a pneumatic cylinder.

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