A cutting forming machine tool for machining a piercing head of a piercing mill

Abstract

This invention provides a cutting and forming machine tool for machining the mandrel of a drilling machine, relating to the field of metal cutting technology. The cutting and forming machine tool for machining the mandrel of a drilling machine includes: a grinding machine, and a fixed cover mounted on the grinding machine. A circular saw wheel is disposed within the fixed cover. The machine also includes a grinding assembly disposed within the fixed cover to prevent the circular saw wheel from becoming dull during grinding. The grinding assembly includes a grinding frame slidably mounted on the fixed cover. The circular saw wheel is in contact with the grinding frame. When the circular saw wheel grinds the mandrel, the grinding frame polishes the working surface of the circular saw wheel. The grinding frame moves according to the diameter change of the circular saw wheel. During the operation of the circular saw wheel, since it is a consumable component, its diameter gradually decreases. When the diameter of the circular saw wheel decreases, the fixed cover moves, simultaneously pulling the grinding frame to maintain contact with the circular saw wheel. This reduces the need for manual removal and cleaning of the circular saw wheel, improves the working efficiency of the equipment, and ensures the quality of grinding.

Description

Technical Field

[0001] This invention relates to the field of metal cutting technology, and in particular to a cutting and forming machine tool for machining the mandrel of a piercing machine. Background Technology

[0002] In the precision machining of piercing mandrels for seamless steel pipes, grinding and finishing the circumferential surface of the mandrel is a special machining method. The circular saw wheel, as the core grinding tool, gradually experiences abrasive passivation and surface clogging during high-speed grinding—a process known as circular saw wheel passivation. Once the circular saw wheel becomes passivated, its cutting ability decreases significantly, and continued machining will lead to burns, scratches, and even dimensional deviations on the mandrel surface, rendering it unusable.

[0003] Currently, the detection and treatment of dull circular saw wheels mainly relies on manual operation. Operators judge whether the circular saw wheel is dull by visually observing the surface condition of the workpiece or by the grinding sound. Once it is determined that it needs to be repaired, the circular saw wheel must be removed from the equipment or the machine must be stopped for manual cleaning. This process not only depends on the operator's operating experience and the judgment standards are not uniform, but also requires interruption of processing every time it is repaired, resulting in frequent machine downtime, which seriously reduces production efficiency and increases auxiliary working hours. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and to propose a cutting and forming machine tool for machining the mandrel of a piercing machine.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A cutting and forming machine tool for machining the mandrel of a drilling machine includes: a grinding machine, and a fixed cover mounted on the grinding machine. A circular saw wheel is disposed inside the fixed cover. The fixed cover also includes a grinding assembly disposed inside the fixed cover for preventing the circular saw wheel from becoming dull during grinding. The grinding assembly includes a grinding frame slidably mounted on the fixed cover. The circular saw wheel is in contact with the grinding frame. When the circular saw wheel grinds the mandrel of the drilling machine, the grinding frame polishes the working surface of the circular saw wheel. The grinding frame moves according to the change in the diameter of the circular saw wheel. The fixed cover is equipped with a lubrication component for driving the grinding frame to move, and the lubrication component also lubricates the working surface of the circular saw wheel. A fixed tube is slidably arranged on the fixed cover, and a rotating shaft that contacts the circular saw wheel is rotatably arranged on the fixed tube. When the fixed tube moves, the grinding frame moves synchronously.

[0006] Preferably, the grinding frame is U-shaped, the inner wall of the grinding frame is provided with diamond grinding stones, and the grinding assembly also includes a guide rod disposed on the upper side of the grinding frame. The guide rod is slidably disposed in the fixed cover, and a first spring is sleeved on the guide rod. A roller is disposed on the top of the first spring, and the guide rod can slide vertically.

[0007] Preferably, a wedge-shaped plate is slidably disposed inside the fixed cover and slides in contact with the roller, and a second spring is fixedly disposed at one end of the wedge-shaped plate.

[0008] Preferably, the bottom of the wedge plate is provided with multiple stepped pressure grooves, and each pair of pressure grooves is connected by an arc.

[0009] Preferably, the lubrication assembly further includes a flow channel opened in the fixed tube. Both the fixed tube and the rotating shaft are hollow. Both ends of the rotating shaft are provided with multiple through holes. One end of the flow channel extends to the outside of the fixed tube, and the other end is intermittently connected to the through holes. When the circular saw wheel rotates, it drives the rotating shaft to rotate, and lubricating fluid is sprayed out of the flow channel.

[0010] Preferably, two polishing cotton balls are fixedly disposed on the fixed tube, and the polishing cotton balls are in contact with the circular saw wheel.

[0011] Preferably, a sliding rod is fixedly installed on the fixed tube, and the sliding rod is slidably installed inside the fixed cover. A third spring is sleeved on the sliding rod, and a steel wire rope is fixedly connected to one end of the sliding rod and one end of the wedge plate.

[0012] Preferably, a speed control component for controlling the rotation speed of the circular saw wheel is provided inside the fixed cover. The speed control component includes a resistor disposed inside the fixed cover, and a slider is slidably disposed on the resistor. The slider is fixedly disposed on a wedge plate. Both the resistor and the slider are electrically connected to the drive motor that drives the circular saw wheel to rotate.

[0013] Preferably, the fixed cover is provided with a warning component, which includes a fixed frame fixedly mounted on a steel wire rope, a transmission rod hinged to the fixed frame, and an indicator needle at the end of the transmission rod. The fixed cover is provided with multiple scales, and the swing angle of the indicator needle changes accordingly when the diameter of the circular saw wheel changes.

[0014] Compared with the prior art, the beneficial effects of the present invention are: By having a fixed tube and a rotating shaft rolling close to each other on the working surface of the circular saw wheel, the fixed tube automatically moves to follow changes in the saw wheel diameter. A steel wire rope pulls the grinding frame to adjust its position synchronously, ensuring the grinding frame remains in contact with the working surface for finishing during saw wheel wear. This eliminates the need for manual intervention, improving automation and production efficiency. Furthermore, the stepped groove design at the bottom of the wedge plate allows the grinding frame to perform differentiated finishing—light, medium, and heavy—at different wear stages of the saw wheel, achieving an adaptive adjustment of the finishing force based on the saw wheel's wear level. This improves the dressing quality and effective service life of the circular saw wheel. The intermittent connection between the through hole and the flow channel when the shaft rotates allows the lubricant to be pulsed and sprayed onto the surface of the circular saw wheel. Combined with the absorption and wiping of the polishing cotton, the lubricant is supplied on demand and waste is avoided. At the same time, it reduces the frictional heat between the circular saw wheel and the workpiece, preventing high-temperature discoloration or scratches on the surface of the perforated head. Each time the grinding frame is adjusted, the wedge plate moves synchronously to adjust the speed of the circular saw wheel motor, keeping the linear speed of the circular saw wheel constant and avoiding the impact on the grinding effect and quality due to changes in the diameter of the circular saw wheel. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the front view structure of the present invention; Figure 2 This is a schematic diagram of the partial front view structure of the present invention; Figure 3 This is a partial rear-view structural diagram of the present invention; Figure 4 This is a schematic diagram of the partial front-side cross-sectional structure of the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the partial front-side cross-sectional structure of the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the internal structure from a partial frontal view of the present invention. Figure 1 ; Figure 7 This is a schematic diagram of the internal structure from a partial frontal view of the present invention. Figure 2 ; Figure 8 This is a schematic diagram of the internal structure from a partial upper view of the present invention. Figure 1 ; Figure 9 This is a schematic diagram of the internal structure from a partial upper view of the present invention. Figure 2 ; Figure 10 This is a schematic diagram of the workflow of the present invention.

[0016] In the diagram: 1. Grinding machine; 2. Fixed cover; 21. Circular saw wheel; 3. Grinding assembly; 31. Grinding frame; 32. Roller; 33. First spring; 34. Wedge plate; 35. Second spring; 36. Pressure groove; 4. Lubrication assembly; 41. Fixed tube; 42. Rotating shaft; 43. Flow channel; 44. Through hole; 45. Polishing cotton; 46. Slide rod; 47. Third spring; 48. Steel wire rope; 5. Speed ​​control assembly; 51. Resistor; 52. Sliding plate; 6. Warning assembly; 61. Fixed frame; 62. Transmission rod; 63. Indicator needle. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] The terms used in this invention, such as "upper," "lower," "left," "right," "middle," and "one," are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] In the description of this specification, the references to terms such as "embodiment," "one embodiment," "some implementations," "exemplary," and "one implementation," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or implementation is included in at least one embodiment or implementation of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or implementations.

[0022] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0023] Combination Figures 1-10 This invention provides a cutting and forming machine tool for machining the mandrel of a piercing machine, comprising: a grinding machine 1, and a fixed cover 2 disposed on the grinding machine 1. A circular saw wheel 21 is disposed inside the fixed cover 2, and a grinding assembly 3 disposed inside the fixed cover 2 for preventing the circular saw wheel 21 from becoming dull during grinding. The grinding assembly 3 includes a grinding frame 31 slidably disposed on the fixed cover 2. The circular saw wheel 21 is in contact with the grinding frame 31, and when the circular saw wheel 21 grinds the mandrel, the grinding frame 31 polishes the working surface of the circular saw wheel 21, and the grinding frame 31 moves according to the change in the diameter of the circular saw wheel 21. The fixed cover 2 is equipped with a lubrication assembly 4 for driving the grinding frame 31 to move, and the lubrication assembly 4 also lubricates the working surface of the circular saw wheel 21; a fixed tube 41 is slidably mounted on the fixed cover 2, and a rotating shaft 42 that contacts the circular saw wheel 21 is rotatably mounted on the fixed tube 41; when the fixed tube 41 moves, the grinding frame 31 moves synchronously; (Reference) Figure 1 and Figure 10 The perforating mandrel is fixed to the grinding machine 1 using an existing clamp. Simultaneously, the circular saw wheel 21 is moved to a position contacting the perforating mandrel. Then, both the circular saw wheel 21 and the perforating mandrel rotate simultaneously, during which the circular saw wheel 21 grinds the perforating mandrel. As the circular saw wheel 21 rotates, the grinding frame 31 adheres to the working surface of the circular saw wheel 21, thus smoothing the working surface. While the circular saw wheel 21 grinds the perforating mandrel, its working surface becomes dull. However, because the grinding frame 31 remains in contact with the working surface of the circular saw wheel 21, it maintains a sharp edge, ensuring the grinding efficiency of the circular saw wheel 21 and preventing high-temperature discoloration and surface roughness of the perforating mandrel due to dulling of the circular saw wheel 21. Scratches may occur. During the rotation of the circular saw wheel 21, the rotating shaft 42 is also in contact with the working surface of the circular saw wheel 21. Therefore, when the circular saw wheel 21 rotates, it can drive the rotating shaft 42 to rotate. When the rotating shaft 42 rotates, hydraulic oil will be sprayed out and act on the surface of the circular saw wheel 21, thereby ensuring that the surface of the circular saw wheel 21 is always in a lubricated state, avoiding hard friction between the circular saw wheel 21 and the perforating head, which would lead to increased dulling of the circular saw wheel 21. During the operation of the circular saw wheel 21, since the circular saw wheel 21 is a consumable, its diameter will gradually decrease. When the diameter of the circular saw wheel 21 decreases, the fixed tube 41 moves, and at the same time pulls the grinding frame 31 to move, so that it always keeps in contact with the circular saw wheel 21, thereby reducing the manual disassembly and cleaning of the circular saw wheel 21, improving the working efficiency of the equipment, and ensuring the quality of grinding.

[0024] Preferred, Reference Figure 7The grinding frame 31 is U-shaped, and its inner wall is lined with diamond polishing stones. The grinding assembly 3 also includes a guide rod located on the upper side of the grinding frame 31. The guide rod is slidably mounted inside the fixed cover 2, and a first spring 33 is sleeved on the guide rod. A roller 32 is located on the top of the guide rod. The guide rod can slide vertically. Because the grinding frame 31 is U-shaped, the diamond polishing stones inside the grinding frame 31 can fully polish the surface of the circular saw wheel 21. When the fixed tube 41 moves, the guide rod descends simultaneously, ensuring that the grinding frame 31 always fits against the surface of the circular saw wheel 21, thus guaranteeing their fit. When the circular saw wheel 21 is replaced with a new one, the elastic force of the first spring 33 can push the guide rod to reset, returning the grinding frame 31 to its initial position, thereby ensuring the usability of the equipment.

[0025] Preferred, Reference Figure 6 A wedge plate 34 is slidably disposed inside the fixed cover 2, which slides in contact with the roller 32. A second spring 35 is fixedly disposed at one end of the wedge plate 34. Since the wedge plate 34 is wedge-shaped, when the diameter of the circular saw wheel 21 decreases, the fixed tube 41 will move. When the fixed tube 41 moves, it can pull the wedge plate 34 to produce displacement. When the wedge plate 34 moves, since the wedge plate 34 is wedge-shaped, it will squeeze the roller 32, causing the guide rod on the lower side of the roller 32 to move synchronously, thereby pushing the grinding frame 31 to always be in contact with the surface of the circular saw wheel 21, so as to fully dress and grind the circular saw wheel 21, avoiding the need for manual dressing of the surface of the circular saw wheel 21, which would affect the working efficiency of the equipment.

[0026] Preferred, Reference Figure 6 and Figure 7 The bottom of the wedge plate 34 is provided with multiple stepped pressure grooves 36, and each pair of pressure grooves 36 is connected by an arc. The wedge shape at the bottom of the wedge plate 34 is designed as stepped. That is, if it is wedge-shaped, the movement of the grinding frame 31 is linear, and the distance between the grinding frame 31 and the circular saw wheel 21 remains constant. However, when the circular saw wheel 21 works for a long time, its surface dulling will gradually intensify. When the bottom of the wedge plate 34 is stepped, each movement of the wedge plate 34 can increase the movement of the grinding frame 31. The distance between the grinding frame 31 and the circular saw wheel 21 is changed to achieve graded dressing: when the circular saw wheel 21 is first dressed, it is light dressing; when the working time of the circular saw wheel 21 is longer and the surface dulling is thicker, the grinding frame 31 dresses it as medium dressing; when the diameter of the circular saw wheel 21 becomes very small, that is, when the surface dulling of the circular saw wheel 21 is thickest, it is heavy dressing; each time the grinding frame 31 stays on the smooth section of the trapezoid for a period of time, thereby improving the dressing quality, ensuring the working quality of the circular saw wheel 21, and achieving graded dressing.

[0027] Preferred, Reference Figure 9The lubrication assembly 4 also includes a flow channel 43 formed inside the fixed tube 41. Both the fixed tube 41 and the rotating shaft 42 are hollow. Multiple through holes 44 are formed at both ends of the rotating shaft 42. One end of the flow channel 43 extends to the outside of the fixed tube 41, and the other end is intermittently connected to the through hole 44. When the circular saw wheel 21 rotates, it drives the rotating shaft 42 to rotate, and lubricating fluid is sprayed out of the flow channel 43. When the circular saw wheel 21 rotates, the rotating shaft 42 is in contact with the circular saw wheel 21, and the rotating shaft 42 also rotates. The rotating shaft 42 can avoid affecting the rotation speed of the circular saw wheel 21 due to friction with the circular saw wheel 21. When the rotating shaft 42 rotates, the multiple through holes 44 formed on both sides of the rotating shaft 42 are intermittently connected to the flow channel 43. Furthermore, because the fixed tube 41 and the rotating shaft 42 are hollow, when external liquid enters the fixed tube 41 and the rotating shaft 42, the liquid in the fixed tube 41 intermittently enters the flow channel 43 through the through hole 44, extends from the flow channel 43 to the hole on the outside of the fixed tube 41 and is discharged intermittently sprayed on the working surface of the circular saw wheel 21, so that the working surface of the circular saw wheel 21 is always in a lubricated state, avoiding excessive friction of the circular saw wheel 21 that would cause the surface of the perforating head to burn at high temperature. At the same time, the intermittent spraying avoids the waste of lubricating fluid. The fixed tube 41 and the rotating shaft 42 act as triggers, constantly measuring the diameter of the circular saw wheel 21 and adjusting the position of the grinding frame 31 to ensure the operation of the equipment.

[0028] Preferred, Reference Figure 8 and Figure 9 Two polishing cotton balls 45 are fixedly installed on the fixed tube 41, and the polishing cotton balls 45 are in contact with the circular saw wheel 21. The two polishing cotton balls 45 are located on both sides of the circular saw wheel 21, and the polishing cotton balls 45, the fixed tube 41 and the rotating shaft 42 form a track wheel shape. The polishing cotton balls 45 are attached to the side of the circular saw wheel 21. When the grinding frame 31 grinds the circular saw wheel 21, burrs may appear. At this time, the polishing cotton balls 45 can polish the circular saw wheel 21 thoroughly. When the circular saw wheel 21 is working, its surface may be covered with waste. At this time, the polishing cotton balls 45 can clean it thoroughly to prevent the waste from affecting the quality of the circular saw wheel 21. When hydraulic oil is sprayed out, the polishing cotton balls 45 can also absorb the liquid to prevent the hydraulic oil from flowing out. The absorbed hydraulic oil can also be wiped on the surface of the circular saw wheel 21, thus forming multiple lubrication.

[0029] Preferred, Reference Figure 8 A sliding rod 46 is fixedly installed on the fixed tube 41, and the sliding rod 46 is slidably installed inside the fixed cover 2. A third spring 47 is sleeved on the sliding rod 46, and one end of the sliding rod 46 is fixedly connected to one end of the wedge plate 34 by a steel wire rope 48. The sliding rod 46 supports the fixed tube 41, that is, the elastic force of the third spring 47 makes the rotating shaft 42 fit against the surface of the circular saw wheel 21. When the diameter of the circular saw wheel 21 decreases, the sliding rod 46 is displaced, and at the same time, the wedge plate 34 is moved by the steel wire rope 48. When the rotating shaft 42 or the circular saw wheel 21 is replaced, the third spring 47 can always keep the rotating shaft 42 in contact with the circular saw wheel 21.

[0030] Preferred, Reference Figure 7 The fixed cover 2 is equipped with a speed control component 5 for controlling the rotation speed of the circular saw wheel 21. The speed control component 5 includes a resistor 51 disposed inside the fixed cover 2, and a slider 52 is slidably disposed on the resistor 51. The slider 52 is fixedly disposed on the wedge plate 34. Both the resistor 51 and the slider 52 are electrically connected to the drive motor that drives the circular saw wheel 21 to rotate. The resistor 51 and the slider 52 form a sliding rheostat, that is, when the wedge plate 34 moves, the resistance between the resistor 51 and the slider 52 can be adjusted, and the speed of the drive motor can be adjusted at the same time. When the diameter of the circular saw wheel 21 is normal, its linear velocity remains constant, allowing for sufficient grinding of the piercing mandrel. When the diameter of the circular saw wheel 21 decreases, its linear velocity becomes proportional to its diameter. In this case, the linear velocity of the circular saw wheel 21 decreases, and if the rotational speed of the circular saw wheel 21 is not increased, it will not be able to grind sufficiently. Therefore, when the diameter of the circular saw wheel 21 decreases, the wedge plate 34 moves, and the slider 52 moves on the resistor 51. At this time, the resistance changes, and the rotational speed of the drive motor that drives the circular saw wheel 21 increases, thereby effectively ensuring the grinding effect of the equipment.

[0031] Preferred, Reference Figure 3 and Figure 6 A warning component 6 is provided on the fixed cover 2. The warning component 6 includes a fixed frame 61 fixedly mounted on the wire rope 48. A transmission rod 62 is hinged to the fixed frame 61, and an indicator needle 63 is provided at the end of the transmission rod 62. The fixed cover 2 is provided with multiple scales, and the swing angle of the indicator needle 63 changes when the diameter of the circular saw wheel 21 changes accordingly. When the diameter of the circular saw wheel 21 decreases, the wire rope 48 moves simultaneously, pulling the fixed frame 61 to move. The transmission rod 62 hinged to the fixed frame 61 rotates, and the indicator needle 63 on the transmission rod 62 rotates synchronously at a certain angle. At this time, the personnel can observe the angle of rotation of the indicator needle 63. When the indicator needle 63 rotates to a certain angle, it indicates that the circular saw wheel 21 has reached the scrap limit. At this time, the circular saw wheel 21 can be replaced, thereby avoiding quality problems during the grinding of the circular saw wheel 21.

[0032] Working principle: The piercing mandrel is fixedly clamped onto the workpiece spindle using the existing fixture on the grinding machine 1, so that the surface to be machined on the piercing mandrel faces the working surface of the circular saw wheel 21; the equipment is started, and the spindle of the circular saw wheel 21 is controlled to drive the circular saw wheel 21 to rotate, while the workpiece spindle is driven to drive the piercing mandrel to rotate. The feed mechanism is controlled to move the circular saw wheel 21 toward the piercing mandrel until the working surface of the circular saw wheel 21 contacts the surface to be machined on the piercing mandrel and reaches the set grinding depth, and the grinding process begins. During the rotation of the circular saw wheel 21, the rotating shaft 42 on the fixed tube 41 is attached to the working surface of the circular saw wheel 21, and the circular saw wheel 21 drives the rotating shaft 42 to rotate. External lubricant is delivered through the fixed tube 41 and the internal flow channel 43 of the rotating shaft 42. When the rotating shaft 42 rotates, the multiple through holes 44 at its end are intermittently connected with the flow channel 43 in the fixed tube 41. The lubricant extends through the flow channel 43 to the hole on the outside of the fixed tube 41 and is discharged, intermittently sprayed on the working surface of the circular saw wheel 21. At the same time, the polishing cotton 45 on the fixed tube 41 absorbs the lubricant and wipes the surface of the circular saw wheel 21, forming multiple lubrication and avoiding hard friction between the circular saw wheel 21 and the perforating head. During operation, the diameter of the circular saw wheel 21 gradually decreases. Under the action of the third spring 47, the fixed tube 41 moves towards the circular saw wheel 21, keeping the rotating shaft 42 in contact with the working surface of the circular saw wheel 21. When the fixed tube 41 moves, the sliding rod 46 pulls the wedge plate 34 to slide inside the fixed cover 2 through the wire rope 48. The stepped pressure groove 36 at the bottom of the wedge plate 34 squeezes the roller 32, and the roller 32 pushes the guide rod and the C-shaped grinding frame 31 to move downward, so that the diamond grinding stone on the inner wall of the grinding frame 31 is always in contact with the working surface of the circular saw wheel 21. The grinding frame 31 performs graded finishing on the working surface of the circular saw wheel 21: when the circular saw wheel 21 is first finished, it is light finishing; when the working time is longer and the surface is dulled and thickened, it is medium finishing; when the diameter of the circular saw wheel 21 is reduced to a small size, it is heavy finishing. Each stage stays for a period of time in the smooth section of the stepped pressure groove 36 to improve the finishing quality. When the wedge plate 34 moves, the slider 52 fixed on it slides synchronously along the resistor 51, changing the resistance value to adjust the speed of the drive motor. When the diameter of the circular saw wheel 21 decreases, the motor speed increases accordingly, maintaining the linear speed of the circular saw wheel 21 constant and ensuring the grinding effect. The wire rope 48 moves at the same time, driving the fixed frame 61 and the transmission rod 62 to move. The indicator needle 63 at the end of the transmission rod 62 swings synchronously. The position of the indicator needle 63 on the scale corresponds to the current diameter of the circular saw wheel 21. When the indicator needle 63 swings to the scrap limit scale, it indicates that the circular saw wheel 21 should be replaced.

[0033] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A cutting forming machine tool for piercing top head machining, comprising: A grinding machine (1) and a fixed cover (2) disposed on the grinding machine (1), wherein a circular saw wheel (21) is disposed inside the fixed cover (2), characterized in that it further includes a grinding assembly (3) disposed inside the fixed cover (2) for preventing the circular saw wheel (21) from dulling during grinding, wherein the grinding assembly (3) includes a grinding frame (31) slidably disposed on the fixed cover (2), wherein the circular saw wheel (21) is in contact with the grinding frame (31), and when the circular saw wheel (21) grinds the through-hole head, the grinding frame (31) polishes the working surface of the circular saw wheel (21), and the grinding frame (31) moves according to the change in diameter of the circular saw wheel (21); The fixed cover (2) is provided with a lubrication component (4) for driving the grinding frame (31) to move, and the lubrication component (4) simultaneously lubricates the working surface of the circular saw wheel (21). A fixed tube (41) is slidably provided on the fixed cover (2), and a rotating shaft (42) that contacts the circular saw wheel (21) is rotatably provided on the fixed tube (41). When the fixed tube (41) moves, the grinding frame (31) moves synchronously.

2. A cutting and forming machine tool for machining a piercing head according to claim 1, characterized in that, The grinding frame (31) is U-shaped, and the inner wall of the grinding frame (31) is provided with diamond grinding stones. The grinding assembly (3) also includes a guide rod provided on the upper side of the grinding frame (31). The guide rod is slidably disposed in the fixed cover (2), and a first spring (33) is sleeved on the guide rod. A roller (32) is provided on the top of the first spring (33), and the guide rod can slide vertically.

3. A cutting and forming machine tool for machining a piercing head according to claim 2, characterized in that, A wedge plate (34) that slides in contact with a roller (32) is slidably disposed inside the fixed cover (2), and a second spring (35) is fixedly disposed at one end of the wedge plate (34).

4. A cutting and forming machine tool for machining a piercing head according to claim 3, characterized in that, The bottom of the wedge plate (34) is provided with a plurality of stepped pressure grooves (36), and there is an arc connection between every two pressure grooves (36).

5. A cutting and forming machine tool for machining a piercing head according to claim 4, characterized in that, The lubrication assembly (4) also includes a flow channel (43) opened in the fixed tube (41). The fixed tube (41) and the rotating shaft (42) are both hollow. Multiple through holes (44) are opened at both ends of the rotating shaft (42). One end of the flow channel (43) extends to the outside of the fixed tube (41), and the other end is intermittently connected to the through hole (44). When the circular saw wheel (21) rotates, it drives the rotating shaft (42) to rotate, and lubricating fluid is sprayed out of the flow channel (43).

6. A cutting and forming machine tool for machining a piercing head according to claim 5, characterized in that, Two polishing cottons (45) are fixedly installed on the fixed tube (41), and the polishing cottons (45) are in contact with the circular saw wheel (21).

7. A cutting and forming machine tool for machining a piercing head according to claim 6, characterized in that, A sliding rod (46) is fixedly installed on the fixed tube (41), and the sliding rod (46) is slidably installed inside the fixed cover (2). A third spring (47) is sleeved on the sliding rod (46), and a steel wire rope (48) is fixedly connected to one end of the sliding rod (46) and one end of the wedge plate (34).

8. A cutting and forming machine tool for machining a piercing head according to claim 7, characterized in that, The fixed cover (2) is provided with a speed control component (5) for controlling the rotation speed of the circular saw wheel (21). The speed control component (5) includes a resistor (51) disposed in the fixed cover (2), and a slider (52) is slidably disposed on the resistor (51). The slider (52) is fixedly disposed on the wedge plate (34). The resistor (51) and the slider (52) are both electrically connected to the drive motor that drives the circular saw wheel (21) to rotate.

9. A cutting and forming machine tool for machining the mandrel of a piercing machine according to claim 8, characterized in that, A warning component (6) is provided on the fixed cover (2). The warning component (6) includes a fixed frame (61) fixedly mounted on the wire rope (48). A transmission rod (62) is hinged on the fixed frame (61), and an indicator needle (63) is provided at the end of the transmission rod (62). Multiple scales are provided on the fixed cover (2), and the swing angle of the indicator needle (63) changes when the diameter of the circular saw wheel (21) changes.

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