A numerical control machine tool magazine structure

Abstract

This invention discloses a CNC machine tool tool magazine structure, including a tool head holder, a tool head drive mechanism, a tool head vertically mounted on the tool head drive mechanism, a tool magazine door bracket, a tool magazine door, guide rails, and a drive electric cylinder. The tool head holder has a positioning step, an adjustment seat, and an adjustment screw. The adjustment screw passes through the adjustment seat and abuts against the drive base for fine-tuning positioning. The tool head has several tool holder latches, each with opposing arc-shaped clamping arms. The tool magazine door is slidably mounted on two parallel guide rails via a slider. The drive electric cylinder drives the tool magazine door to slide via a tool magazine door mounting seat. This invention, through the electric cylinder driving the tool magazine door, the dual guide rail guidance, and the elastic tool holder latch structure, achieves precise and stable operation of the tool magazine door, high-precision positioning of the tool head, and wide compatibility of tool holders. It has the advantages of stable operation, high positioning accuracy, wide applicability, and high reliability.

Description

Technical Field

[0001] This invention relates to the field of CNC machine tool technology, and more specifically to a CNC machine tool tool magazine structure. Background Technology

[0002] CNC machine tools are equipped with tool magazines and can automatically change tools to perform multi-process machining on workpieces. As a key functional component of CNC machine tools, the performance of the tool magazine has a significant impact on machining efficiency. A well-designed and arranged tool magazine structure can greatly reduce non-cutting time during machining, thereby improving production efficiency.

[0003] However, the existing CNC machine tool magazine structure has the following shortcomings: First, the existing tool magazine doors are mostly driven by cylinders. The stroke control accuracy of cylinder drive is low, and it cannot accurately control the opening stroke of the tool magazine door. Moreover, the cylinder movement speed is not easy to adjust, and the impact during the opening and closing process is large, which can easily cause damage to the tool magazine door and drive mechanism.

[0004] Secondly, most existing tool magazine doors use a single guide rail or an external structure, which makes the tool magazine door prone to deviation during movement, resulting in uneven operation, jamming, and loud operating noise.

[0005] Third, the tool head bases of existing tool magazines are mostly made of metal, which is greatly affected by temperature changes. Thermal expansion and contraction can easily lead to a decrease in the positioning accuracy of the tool head. At the same time, the tool head base lacks an effective positioning adjustment mechanism, making installation and debugging inconvenient.

[0006] Fourth, most tool holders in existing tool magazines are installed using a vertical insertion hole method, with a fixed diameter of the tool magazine hole. This means they can only be used with tool holders of a specific diameter, resulting in a narrow range of applications and incompatibility with tool holders equipped with water grinding discs.

[0007] Fifth, the tool holder is easily contaminated with chips and cutting fluid during use, which affects tool changing accuracy and machining quality. There is a lack of effective automatic tool holder cleaning devices in the current technology. Summary of the Invention

[0008] To achieve the above objectives, the present invention provides a CNC machine tool tool magazine structure, including a tool head holder, a tool head drive mechanism, and a tool head vertically mounted on the tool head drive mechanism, wherein the tool head is provided with a plurality of tool holder latches.

[0009] The cutter head holder is provided with a positioning step, which is used for positioning and installing the cutter head drive mechanism. Adjusting seats are provided at both ends of the cutter head holder, and adjusting screws are threaded onto the adjusting seats. The adjusting screws pass through the adjusting seats and abut against the drive base of the cutter head drive mechanism. The position of the drive base can be finely adjusted by rotating the adjusting screws, facilitating positioning and installation. The cutter head holder is made of marble, which has a low coefficient of thermal expansion and high stability.

[0010] The cutter head drive mechanism includes a drive base, a divider, and a servo motor. The divider and servo motor are fixedly mounted on the drive base. The output end of the servo motor is connected to the input end of the divider, and the output end of the divider is connected to the cutter head. The servo motor drives the divider to rotate, and the divider drives the cutter head to achieve indexing rotation, rotating the required tool to the tool change position.

[0011] The knife handle latch has two opposing arc-shaped clamping arms, each with a protrusion on its inner side. These two clamping arms, positioned opposite each other, form a clamping space to hold the knife handle. The knife handle latch is made of polyoxymethylene (POM), a type of plastic known for its wear resistance, high strength, and lightweight properties. The knife handle latch is equipped with a positioning pin and a fixing bolt hole. The positioning pin passes between the knife handle latch and the cutter disc, ensuring precise positioning. The fixing bolt hole allows bolts to pass through and secure the knife handle latch to the cutter disc. This dual fixing method, using both the positioning pin and the bolt, effectively prevents the knife handle latch from loosening during use.

[0012] The tool magazine door support is located around the tool disc, and the tool magazine door support has a tool changing port, through which the robot arm can perform tool picking and placing operations.

[0013] The tool magazine door is slidably mounted on the tool magazine door bracket and is used to close or open the tool changing port. The tool magazine door is equipped with reinforcing ribs that are arranged along the width direction of the door, significantly improving its structural strength and rigidity.

[0014] There are two guide rails, which are arranged parallel to each other on the tool magazine door bracket. The tool magazine door is slidably mounted on the two guide rails by a slider, so that the tool magazine door is evenly stressed and runs smoothly.

[0015] The electric drive cylinder is fixedly mounted on the tool magazine door bracket. The electric drive cylinder drives the tool magazine door to slide. The output end of the electric drive cylinder is connected to a tool magazine door mounting base, which is fixedly connected to the tool magazine door. By replacing the traditional pneumatic cylinder drive with an electric cylinder, the electric cylinder can precisely control the opening stroke of the tool magazine door, achieving accurate positioning and smooth movement of the tool magazine door.

[0016] The CNC machine tool tool magazine structure provided by this invention also includes an air blowing device disposed inside the tool magazine door bracket. The air blowing device includes an air nozzle and a high-pressure air pipe, with the air outlet of the air nozzle aligned with the tool holder held in place by the tool holder latch. When the tool holder needs cleaning, high-pressure gas is blown onto the surface of the tool holder through the air nozzle to remove chips and cutting fluid adhering to the tool holder, ensuring the cleanliness of the tool holder and improving tool changing accuracy and machining quality.

[0017] The top of the tool magazine door bracket is equipped with a protective cover to protect the two guide rails, prevent chips and cutting fluid from falling into the guide rails, and ensure smooth operation and service life of the guide rails.

[0018] The beneficial effects of this invention are: 1. By changing the tool magazine door drive from a traditional pneumatic cylinder to an electric cylinder, the electric cylinder can precisely control the opening stroke of the tool magazine door, achieving accurate positioning and smooth movement of the tool magazine door. This avoids the problem of inaccurate stroke control caused by pneumatic cylinder drive, reduces impact and noise during the opening and closing process, and extends the service life of the equipment.

[0019] 2. By adopting a horizontal double guide rail structure to guide the tool magazine door, the two guide rails are set in parallel. The tool magazine door is slidably set on the two guide rails by a slider, so that the tool magazine door is evenly stressed and runs smoothly, effectively avoiding the deviation and jamming problems that are easy to occur with single guide rail guidance.

[0020] 3. By adding reinforcing ribs to the inside of the tool magazine door, the structural strength and rigidity of the tool magazine door are significantly improved, making the tool magazine door less prone to deformation during long-term frequent opening and closing, thus ensuring the sealing performance and operational reliability of the tool magazine door.

[0021] 4. By using marble to make the cutter head seat, marble has the characteristics of low thermal expansion coefficient and high stability, which can effectively reduce the impact of temperature changes on the positioning accuracy of the cutter head. At the same time, by setting positioning steps, adjusting seats and adjusting screws on the cutter head seat, the adjusting screw passes through the adjusting seat and abuts against the drive base, which realizes precise positioning and fine adjustment of the cutter head drive mechanism during installation, which facilitates installation and debugging.

[0022] 5. By using a clamping arm made of POM (polyoxymethylene) material to replace the traditional vertical insertion hole structure, the clamping arm has a certain elastic deformation capability, which can be adapted to various tool holders of different diameters and has a wide range of applications; at the same time, the clamping method of the clamping arm can also be compatible with tool holders with water grinding discs, overcoming the defect that the traditional vertical insertion hole structure cannot be compatible with tool holders with water grinding discs.

[0023] 6. By setting positioning pins and fixing bolt holes, the tool holder buckle achieves precise positioning with the tool disc through the positioning pins, and then is locked with bolts. The double fixing effectively prevents the tool holder buckle from loosening during use and ensures the reliability of tool holder clamping.

[0024] 7. By setting up an air blowing device, the tool holder can be automatically cleaned by blowing air to remove chips and cutting fluid adhering to the surface of the tool holder, ensuring the cleanliness of the tool holder and improving tool changing accuracy and machining quality.

[0025] 8. Protective covers are installed to protect the guide rails, preventing chips and cutting fluid from falling into them, thus ensuring smooth operation and extending the service life of the guide rails. Attached Figure Description

[0026] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of a CNC machine tool tool magazine according to the present invention.

[0028] Figure 2 This is another structural schematic diagram of a CNC machine tool tool magazine structure according to the present invention.

[0029] Figure 3 This is a schematic diagram of the tool magazine door of a CNC machine tool tool magazine structure according to the present invention.

[0030] Figure 4 This is a schematic diagram of the adjustment seat for a CNC machine tool tool magazine structure according to the present invention.

[0031] Figure 5 This is a schematic diagram of a tool head drive mechanism for a CNC machine tool tool magazine structure according to the present invention.

[0032] Figure 6 This is a schematic diagram of a tool holder latch in a CNC machine tool tool magazine structure according to the present invention.

[0033] Figure 7 This is another schematic diagram of a tool holder latch in a CNC machine tool tool magazine structure according to the present invention.

[0034] The labels in the diagram represent: 1. Cutter head holder; 101. Positioning step; 102. Adjusting seat; 103. Adjusting screw; 2. Cutter head drive mechanism; 201. Drive base; 202. Divider; 203. Servo motor; 3. Cutter head; 4. Tool holder buckle; 401. Clamping arm; 402. Protrusion; 403. Positioning pin; 404. Fixing bolt hole; 5. Drive cylinder; 501. Tool magazine door mounting base; 6. Tool magazine door bracket; 601. Tool changing edge; 7. Tool magazine door; 701. Reinforcing rib; 8. Protective cover; 9. Guide rail; 10. Slider. Detailed Implementation

[0035] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0037] The following is a detailed description of a CNC machine tool tool magazine structure provided by an embodiment of the present invention, with reference to the accompanying drawings.

[0038] Example 1 like Figures 1 to 7 As shown, this embodiment provides a CNC machine tool tool magazine structure, including a tool head holder 1, a tool head drive mechanism 2, a tool head 3, a drive electric cylinder 5, a tool magazine door bracket 6, a tool magazine door 7, a protective cover 8, a guide rail 9, and a slider 10.

[0039] Cutterhead holder 1: as shown Figure 1 , Figure 4 , Figure 5 As shown, the cutter head holder 1 is provided with a positioning step 101, which is used to position and install the drive base 201 of the cutter head drive mechanism 2, ensuring accurate installation. Adjusting seats 102 are provided at opposite ends of the cutter head holder 1. Adjusting screws 103 are threaded onto the adjusting seats 102, passing through the adjusting seats 102 and abutting against the drive base 201. When installing the drive base 201, first place the drive base 201 at the positioning step 101, and then rotate the adjusting screws 103. The end of the adjusting screws 103 pushes the drive base 201 to make fine adjustments in the horizontal direction, achieving precise positioning of the drive base 201 and facilitating installation and debugging. The number of adjusting seats 102 and adjusting screws 103 can be set according to actual needs. In this embodiment, one adjusting seat 102 is provided at each end of the cutter head holder 1, and one adjusting screw 103 is provided on each adjusting seat 102.

[0040] Cutter head drive mechanism 2: such as Figure 1 , Figure 4 and Figure 5As shown, the tool turret drive mechanism 2 includes a drive base 201, an indexer 202, and a servo motor 203. The drive base 201 is mounted on the tool turret holder 1, positioned by a positioning step 101, and finely adjusted and locked by an adjusting screw 103. The indexer 202 and the servo motor 203 are fixedly mounted on the drive base 201. The output end of the servo motor 203 is connected to the input end of the indexer 202 (e.g., via gear transmission), and the output end of the indexer 202 is connected to the tool turret 3. The servo motor 203 rotates according to the instructions of the CNC system, driving the indexer 202 to rotate. The indexer 202 drives the tool turret 3 to achieve precise indexing rotation, rotating the required tool to the tool change position. The indexer 202 is a cam indexer, characterized by high indexing accuracy and smooth operation.

[0041] Cutter head 3: as Figure 4 and Figure 5 As shown, the cutter head 3 has a disc-shaped structure and is vertically mounted on the cutter head drive mechanism 2. That is, the disc surface of the cutter head 3 is arranged in the vertical direction and is fixedly connected to the output end of the divider 202. Several tool holder clips 4 are evenly arranged on the cutter head 3 along the circumference for clamping and fixing the tool holders.

[0042] Knife handle latch 4: such as Figure 1 , Figure 6 and Figure 7 As shown, the knife handle clip 4 includes a clamping arm 401, a protrusion 402, a positioning pin 403, and a fixing bolt hole 404. The clamping arm 401 has an arc-shaped structure, with two clamping arms 401 arranged opposite each other. The arc-shaped notches of the two clamping arms 401 face each other, forming a circular knife handle clamping space to accommodate and clamp the knife handle. The knife handle clip 4 is made of acetal plastic (i.e., polyoxymethylene POM), which is wear-resistant, high-strength, and lightweight, while also possessing a certain degree of elastic deformation. The clamping arm 401, made of acetal plastic, can produce slight elastic deformation, thus adapting to various knife handles of different diameters and also compatible with knife handles with water grinding discs, greatly expanding the applicability of the knife magazine. The inner side of the clamping arm 401 has a protrusion 402, which is an annular or arc-shaped protrusion, used to cooperate with the annular groove or positioning groove on the knife handle, enhancing the stability of the clamping and preventing the knife handle from slipping out during clamping. A positioning pin 403 is fixedly mounted on the tool holder latch 4, passing through the tool holder latch 4 and the cutter head 3 to achieve precise positioning between them. A fixing bolt hole 404 is formed on the tool holder latch 4 for a bolt to pass through, thus securing the tool holder latch 4 to the cutter head 3. This dual fixing method of positioning with the positioning pin 403 and bolt locking effectively prevents the tool holder latch 4 from loosening during use, ensuring the reliability of the tool holder clamping.

[0043] Tool magazine door bracket 6: as Figure 1 and Figure 2As shown, the tool magazine door bracket 6 is located on the periphery of the tool disc 3 and is fixedly installed on the machine tool bed or the protective cover 8. The tool magazine door bracket 6 has a tool changing port 601, the position of which corresponds to the tool changing position on the tool disc 3, allowing the robot arm to perform tool picking and placing operations through the tool changing port 601.

[0044] Guide rail 9 and slider 10: as shown Figure 1 , Figure 2 and Figure 3 As shown, there are two guide rails 9, which are arranged parallel to each other on the tool magazine door bracket 6 and extend horizontally. One or more sliders 10 are slidably mounted on each guide rail 9. The sliders 10 are fixedly connected to the tool magazine door 7, so as to realize the horizontal sliding of the tool magazine door 7 on the tool magazine door bracket 6.

[0045] Knife Armor Gate 7: As Figure 1 , Figure 2 and Figure 3 As shown, the tool magazine door 7 is slidably mounted on two guide rails 9 via a slider 10, used to close or open the tool changing port 601. When closed, the tool magazine door 7 covers the tool changing port 601, providing protection and sealing; when open, it exposes the tool changing port 601 for tool changing operations. The tool magazine door 7 is equipped with reinforcing ribs 701, which are arranged along the width of the door 7. There may be one or more reinforcing ribs 701 (e.g., two or three). The reinforcing ribs 701 significantly improve the structural strength and rigidity of the tool magazine door 7, making it less prone to deformation during long-term frequent opening and closing, thus ensuring the sealing performance and operational reliability of the tool magazine door 7.

[0046] Drive cylinder 5: such as Figure 1 , Figure 2 and Figure 3 As shown, the drive cylinder 5 is fixedly mounted on the tool magazine door bracket 6. The output end of the drive cylinder 5 is connected to the tool magazine door mounting base 501, which is fixedly connected to the tool magazine door 7. The drive cylinder 5 is used to drive the tool magazine door 7 to slide horizontally along the guide rail 9. The drive cylinder 5 is a servo cylinder or a stepper cylinder, including components such as a motor, lead screw, and nut. The motor drives the lead screw to rotate, and the lead screw drives the nut to move linearly, thereby driving the tool magazine door mounting base 501 and the tool magazine door 7 to move. The drive cylinder 5 is electrically connected to the controller of the CNC system. The controller sends control commands to the drive cylinder 5, which can accurately control the opening stroke and movement speed of the tool magazine door 7, achieving precise positioning and smooth movement of the tool magazine door 7, avoiding the problems of inaccurate stroke control and large impact of traditional cylinder-driven stroke control.

[0047] Protective shield 8: such as Figure 1 and Figure 2As shown, the top of the tool magazine door bracket 6 is covered with a protective cover 8 to protect the two guide rails 9, prevent the chips and cutting fluid generated during the processing from falling onto the guide rails 9, and ensure the smooth operation and service life of the guide rails 9.

[0048] Example 2 This embodiment, based on Embodiment 1, further includes an air blowing device. The air blowing device is located inside the tool magazine door bracket 6 and includes an air nozzle and a high-pressure air pipe. The inlet of the high-pressure air pipe is connected to a compressed air source or air pump, and the outlet of the high-pressure air pipe is connected to the air nozzle. The outlet of the air nozzle is aligned with the tool holder held by the tool holder latch 4. When the tool holder needs cleaning, compressed air is blown onto the surface of the tool holder through the high-pressure air pipe and the air nozzle to remove chips and cutting fluid adhering to the tool holder. The air blowing device can automatically start before tool changing to clean the tool holder to be used, or it can clean the returned tool holder after tool changing, ensuring the cleanliness of the tool holder and improving tool changing accuracy and machining quality. The start and stop of the air blowing device are automatically controlled by the controller of the CNC system.

[0049] Example 3 The difference between this embodiment and Embodiment 1 or Embodiment 2 is that the cutter head seat 1 is made of marble, which has the characteristics of low thermal expansion coefficient and high stability, and can effectively reduce the impact of temperature changes on the positioning accuracy of the cutter head.

[0050] Specific usage methods In practical use, the tool magazine structure of this invention is installed on a CNC machine tool. Drive cylinder 5, according to instructions from the CNC system, drives the tool magazine door 7 to slide horizontally along the two guide rails 9 to the open position, opening the tool change port 601. Servo motor 203 drives the divider 202 to rotate, which in turn drives the tool disc 3 to rotate, rotating the target tool holder to the tool change position. A robotic arm extends into the tool magazine through the tool change port 601, removing the target tool holder from the tool holder latch 4, or returning a used tool holder to the tool holder latch 4. After tool change, drive cylinder 5 drives the tool magazine door 7 to close, covering the tool change port 601. Throughout the process, an air blowing device can periodically clean the tool holder with air as needed.

[0051] The marble material of the cutter head holder 1 ensures that the positioning accuracy of the cutter head 3 is not affected by temperature changes; the positioning step 101, the adjusting seat 102, and the adjusting screw 103 facilitate the installation and debugging of the cutter head drive mechanism 2; the clamping arm 401 of the tool holder buckle 4 can adapt to tool holders of various diameters, with a wide range of applications; the positioning pin 403 and the fixing bolt hole 404 ensure the installation accuracy and reliability of the tool holder buckle 4; the reinforcing rib 701 enhances the structural strength of the tool magazine door 7; and the protective cover 8 effectively protects the guide rail 9.

[0052] The following points need to be explained: (1) The accompanying drawings of the embodiments of this disclosure only involve the structures involved in the embodiments of this disclosure. Other structures can be referred to the general design.

[0053] (2) Where there is no conflict, features of the same embodiment and different embodiments of this disclosure can be combined with each other.

[0054] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A tool magazine structure for a CNC machine tool, characterized in that, include: The tool holder (1), the tool drive mechanism (2) and the tool disc (3) mounted vertically on the tool drive mechanism (2) are provided with a number of tool holder buckles (4). The tool magazine door bracket (6) is located on the periphery of the tool disc (3), and the tool magazine door bracket (6) is provided with a tool changing port (601). The tool magazine door (7) is slidably mounted on the tool magazine door bracket (6) for closing or opening the tool changing port (601). Guide rails (9), two guide rails (9) are arranged in parallel on the tool magazine door bracket (6), and the tool magazine door (7) is slidably arranged on the two guide rails (9) by a slider (10); A drive cylinder (5) is fixedly installed on the tool magazine door bracket (6). The drive cylinder (5) is used to drive the tool magazine door (7) to slide. The output end of the drive cylinder (5) is connected to a tool magazine door mounting base (501). The tool magazine door mounting base (501) is fixedly connected to the tool magazine door (7).

2. The CNC machine tool tool magazine structure according to claim 1, characterized in that: The handle latch (4) is provided with arc-shaped clamping arms (401) opposite each other. The inner side of the clamping arms (401) is provided with protrusions (402). The two clamping arms (401) are arranged opposite each other and together form the handle clamping space.

3. The CNC machine tool tool magazine structure according to claim 1, characterized in that: The tool holder buckle (4) is fixedly provided with a positioning pin (403) and a fixing bolt hole (404). The positioning pin (403) passes between the tool holder buckle (4) and the cutter disc (3). The fixing bolt hole (404) is used for the bolt to pass through to fix the tool holder buckle (4) to the cutter disc (3).

4. The CNC machine tool tool magazine structure according to claim 1, characterized in that: The handle buckle (4) is made of acetal plastic.

5. The CNC machine tool tool magazine structure according to claim 1, characterized in that: The cutter head drive mechanism (2) includes a drive base (201), a divider (202) and a servo motor (203). The drive base (201) is mounted on the cutter head seat (1). The divider (202) and the servo motor (203) are mounted on the drive base (201). The output end of the servo motor (203) is connected to the input end of the divider (202). The output end of the divider (202) is connected to the cutter head (3).

6. The CNC machine tool tool magazine structure according to claim 5, characterized in that: The cutter head seat (1) is provided with a positioning step (101), which is used to position the drive base (201). The two ends of the cutter head seat (1) are provided with adjusting seats (102) respectively. An adjusting screw (103) is threadedly connected to the adjusting seat (102). The adjusting screw (103) passes through the adjusting seat (102) and abuts against the drive base (201).

7. The CNC machine tool tool magazine structure according to claim 1, characterized in that: The cutter head holder (1) is made of marble.

8. The CNC machine tool tool magazine structure according to claim 1, characterized in that: The blade magazine door (7) is provided with reinforcing ribs (701).

9. The CNC machine tool tool magazine structure according to claim 1, characterized in that: It also includes an air blowing device located inside the tool magazine door bracket (6), the air blowing device including an air blowing nozzle and a high-pressure air pipe, the air outlet of the air blowing nozzle being aligned with the tool handle held by the tool handle buckle (4).

10. The CNC machine tool tool magazine structure according to claim 1, characterized in that: The top of the knife magazine door bracket (6) is covered with a protective cover (8) to protect the two guide rails (9).

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