Multi-procedure composite numerical control cutter handle machining process with turning instead of grinding

Abstract

The invention provides a multi-procedure composite numerical control cutter handle machining process with turning instead of grinding. Aiming at the problems of low machining efficiency and the like in the grinding machining process of the numerical control knife handle, the surface roughness and the like are used as parameters, the turning instead of grinding process is improved, the finish machining process after heating of the knife handle is researched and broken through, a hard turning process is adopted for the knife changing part of a manipulator, and the working procedures are centralized and are subjected to numerical control machining.

Description

Technical Field

[0001] The present invention relates to the processing technology of tool holders, and particularly to a numerically controlled tool holder processing technology that combines multiple processes with turning instead of grinding. Background Art

[0002] As a core functional component connecting the machine tool spindle and the cutting tool in the numerical control machining system, the tool holder plays a key role in power transmission, accuracy guarantee, and system stability. Its performance directly affects the machining quality, tool life, and production efficiency. Especially in high-precision manufacturing fields such as aerospace and precision molds, extremely high manufacturing precision requirements are imposed on the tool holder.

[0003] Currently, in the manufacturing of tool holders, traditional grinding processes are generally adopted for finish machining after heat treatment, but this process has significant technical defects:

[0004] A. High work difficulty, low production concentration, and long production cycle;

[0005] B. Insufficient accuracy stability: Cumulative errors caused by repeated clamping during multi-process switching.

[0006] C. Bottleneck in machining efficiency: Limited by the rigid contact characteristics of the grinding wheel, parameters need to be frequently adjusted during the machining process to cope with the physical property differences of different materials (such as cemented carbide, ceramic composite materials, etc.).

[0007] Therefore, there is an urgent need to develop a numerically controlled tool holder processing technology that combines multiple processes with turning instead of grinding. Summary of the Invention

[0008] The purpose of the present invention is to provide a numerically controlled tool holder processing technology that combines multiple processes with turning instead of grinding to solve the problems existing in the prior art.

[0009] The technical solution adopted to achieve the purpose of the present invention is as follows: A numerically controlled tool holder processing technology that combines multiple processes with turning instead of grinding includes the following steps:

[0010] 1) Material pre-treatment stage.

[0011] 1.1) Blanking. The raw material is processed into a tool holder blank through wire cutting or laser cutting, leaving the allowance for subsequent processing.

[0012] 1.2) Rough machining before heat treatment. The outer circle, end face, and inner hole of the tool holder blank are rough turned to form a basic contour. The tool holder blank is milled for V-grooves, positioning keyways, and anti-slip patterns. The positions of the pre-tensioning screw holes are marked.

[0013] 2) Core strengthening stage.

[0014] 2.1) Heat treatment.

[0015] 2.2) Surface strengthening treatment.

[0016] 3) Precision forming stage.

[0017] 3.1) Precision turning the outer diameter and V-groove. An automatic tensioning device and a centering base are installed on the CNC lathe spindle head. Among them, a CNC lathe pull rod is slidably installed on the CNC lathe spindle head. The automatic tensioning device is a stepped rotary body with an inner cavity. The tail end of the automatic tensioning device is connected to the CNC lathe spindle head. A lobe claw is arranged in the inner cavity of the automatic tensioning device. The CNC lathe pull rod extends into the inner cavity of the automatic tensioning device. An installation hole is axially penetrated through the centering base. The installation hole sequentially includes a connection section, a reduced diameter section, and a plug-in section. The head end of the automatic tensioning device extends into the connection section. The plug-in section is adapted to the taper shank shape of the tool holder to be machined. A pull stud is threadedly connected to the tail part of the inner cavity of the tool holder to be machined. The tool holder to be machined and the pull stud are inserted into the installation hole through the plug-in section. The taper shank of the tool holder to be machined is accommodated in the plug-in section. The clamping head of the pull stud extends into the inner cavity of the automatic tensioning device and is in interference clamping fit with the lobe claw. The CNC lathe pull rod is connected to the pull stud.

[0018] 3.2) Compound grinding of the taper shank. Rough grind to form the taper shank angle, and replace the fine-grained grinding wheel to finish grinding the taper.

[0019] 3.3) Precision boring of the pull stud hole.

[0020] 4) Quality assurance stage.

[0021] 4.1) Comprehensive inspection. Conduct key dimension inspection and mechanical property inspection.

[0022] 4.2) Final surface treatment. Conduct ultrasonic cleaning and anti-rust treatment.

[0023] 5) Digital management stage.

[0024] 5.1) Process data traceability.

[0025] 5.2) Intelligent warehousing.

[0026] Furthermore, the tool holder is a hardened steel CNC tool holder.

[0027] Furthermore, before step 3), an orthogonal test on cutting speed, cutting depth, and feed rate is carried out to complete the analysis of surface roughness, outer diameter size, V-groove measuring rod distance, and geometric tolerance, and the optimal cutting parameter combination is obtained.

[0028] The technical effect of the present invention is beyond doubt:

[0029] A. Process combination to improve efficiency: In traditional grinding processes, each process is usually carried out separately, and there is time for transfer and fixture replacement between each process. However, our turning instead of grinding optimization solution combines multiple processes, greatly reducing the conversion time between processes and improving production efficiency;

[0030] B. High clamping accuracy: The taper shank positioning method can achieve precise workpiece clamping, avoiding machining errors caused by inaccurate clamping. This high-precision clamping can ensure the stability of the workpiece position during the machining process and improve machining accuracy;

[0031] C. Improve clamping efficiency: The automatic tensioning device enables the clamping process to be completed quickly and automatically without manual intervention. Compared with the traditional manual clamping method, this greatly improves the clamping efficiency, saves production time, and reduces human errors;

[0032] D. Improve machining stability: The automatic tensioning device can achieve a more stable clamping force, avoiding problems that affect machining quality due to uneven or unstable clamping force;

[0033] E. Improvement in surface roughness, corner transition, and lathe machining consistency: It can not only achieve high-precision surface quality and smooth transition, but also ensure consistency and stability during the machining process, reducing accuracy fluctuations caused by equipment switching or process combination. The application of this technology not only improves production efficiency but also ensures consistent machining quality in multiple workpiece batches, making it suitable for manufacturing environments with high-precision and high-quality requirements. Description of the Drawings

[0034] Figure 1 It is a schematic diagram of the process for precision turning the V-groove of the tool shank;

[0035] Figure 2 It is a schematic diagram of the process for precision turning the large outer diameter of the tool shank;

[0036] Figure 3 It is a schematic diagram of the precision machining part.

[0037] In the figure: CNC lathe spindle head 1, CNC lathe pull rod 2, automatic tensioning device 3, BT50 base 4, BT50 pull stud 5, tool shank to be machined 6, machining tool 7. Detailed Implementation Manner

[0038] The present invention will be further described below in conjunction with embodiments, but it should not be understood that the above-mentioned subject matter of the present invention is limited to the following embodiments only. Without departing from the above-mentioned technical idea of the present invention, various substitutions and modifications made according to common general technical knowledge and customary means in the art should all be included within the protection scope of the present invention.

[0039] Embodiment 1:

[0040] This embodiment provides a numerical control tool holder processing technology for replacing grinding with turning and multi - process compounding, including the following steps:

[0041] 1) Material pre - treatment stage.

[0042] 1.1) Blanking. The raw material is processed into a tool holder blank by wire cutting or laser cutting, reserving the allowance for subsequent processing.

[0043] 1.2) Rough machining before heat treatment. The outer circle, end face and inner hole of the tool holder blank are rough - turned to form a basic contour. The tool holder blank is milled for V - grooves, positioning keyways and anti - slip patterns. Mark and pre - drill the position of the pull - stud hole.

[0044] 2) Core strengthening stage.

[0045] 2.1) Heat treatment.

[0046] 2.2) Surface strengthening treatment.

[0047] 3) Precision forming stage.

[0048] 3.1) Precision turning of the outer circle and V - groove. An automatic tensioning device 3 and a centering base 4 are installed on the numerical control lathe spindle head 1. Among them, a numerical control lathe pull rod 2 is slidably installed on the numerical control lathe spindle head 1. The automatic tensioning device 3 is a stepped rotary body with an inner cavity. The tail end of the automatic tensioning device 3 is connected to the numerical control lathe spindle head 1. Claw segments are arranged in the inner cavity of the automatic tensioning device 3. The numerical control lathe pull rod 2 extends into the inner cavity of the automatic tensioning device 3. An installation hole is axially penetrated through the centering base 4. The installation hole sequentially includes a connection section, a reduced - diameter section and a plug - in section. The head end of the automatic tensioning device 3 extends into the connection section. The plug - in section is adapted to the taper - handle shape of the tool holder 6 to be processed. A pull - stud 5 is thread - connected to the inner cavity tail of the tool holder 6 to be processed. The tool holder 6 to be processed and the pull - stud 5 are inserted into the installation hole through the plug - in section. The taper - handle of the tool holder 6 to be processed is accommodated in the plug - in section. The clamping head of the pull - stud 5 extends into the inner cavity of the automatic tensioning device 3 and is in interference clamping fit with the claw segments. The numerical control lathe pull rod 2 is connected to the pull - stud 5.

[0049] 3.2) Compound grinding of the taper - handle. Rough - grind to form the taper - handle angle, and replace the fine - grain grinding wheel to finish - grind the taper.

[0050] 3.3) Precision boring of the pull - stud hole.

[0051] 4) Quality assurance stage.

[0052] 4.1) Comprehensive inspection. Conduct key dimension inspection and mechanical property inspection.

[0053] 4.2) Final surface treatment. Conduct ultrasonic cleaning and anti - rust treatment.

[0054] 5) Digital management stage.

[0055] 5.1) Process data traceability.

[0056] 5.2) Intelligent warehousing.

[0057] The automatic tensioning device 3 of the CNC lathe can achieve rapid disassembly and clamping, shortening the product clamping time. The positioning seat is used for clamping, accurately centering and positioning, ensuring the product clamping accuracy and ensuring that the product processing dimensions meet the requirements; the special turning tool is used for precision turning of the large outer circle and V-shaped groove, which can greatly shorten the processing time, reduce the processing cost, improve the product quality and processing efficiency; the inner cone of the special tooling is matched with the outer cone of the tool shank, and the tool shank is used for positioning during each clamping, and the repeated clamping positioning accuracy is high, which can meet the requirements of batch processing.

[0058] Embodiment 2:

[0059] The main content of this embodiment is the same as that of Embodiment 1. Among them, the tool shank is a hardened steel CNC tool shank. Before step 3), an orthogonal test on the cutting speed, cutting depth and feed rate is carried out, and the analysis of surface roughness, outer circle size, V-shaped groove measuring rod distance and geometric tolerance is completed to obtain the optimal cutting parameter combination.

[0060] Embodiment 3:

[0061] The main content of this embodiment is the same as that of Embodiment 1. Among them, finally, through experimental verification, compared with the grinding process processing efficiency (12 min / piece), the precision turning processing efficiency is increased to 8 min / piece, and the turning process efficiency is increased by 50%. 50 pieces of tool shanks are selected for each batch for testing. The inspection results show that the product qualification rate reaches 98%, proving that in the processing of the outer circle and V-shaped groove of the BT50 tool shank, the process improvement of replacing grinding with turning has been successful.

Claims

1. A CNC tool handle processing technology with multiple processes of turning instead of grinding, characterized in that: The following steps are involved: 1) Material pretreatment stage; 1.1) Cutting: Process the raw material into a handle blank by wire cutting or laser cutting, leaving a margin for subsequent processing; 1.2) Rough machining before heat treatment: rough turning the outer circle, end face and inner hole of the tool handle blank to form the basic contour; milling the V-groove, positioning keyway and anti-slip pattern of the tool handle blank; marking and pre-pulling the nail hole position; 2) Core strengthening stage; 2.1) Heat treatment; 2.2) Surface strengthening treatment; 3) Precision forming stage; 3.1) fine turning of the outer circle and V-shaped groove; an automatic tensioning device (3) and a centering base (4) are installed on the CNC lathe axle head (1); wherein a CNC lathe pull rod (2) is slidably installed on the CNC lathe axle head (1); the automatic tensioning device (3) is a stepped rotating body with an inner cavity; the tail end of the automatic tensioning device (3) is connected to the CNC lathe axle head (1); a flap claw is provided in the inner cavity of the automatic tensioning device (3); the CNC lathe pull rod (2) extends into the inner cavity of the automatic tensioning device (3); a mounting hole is provided on the centering base (4) along the axial direction; the mounting hole The mounting hole comprises a connecting section, a reduced diameter section and an inserting section in sequence; the head end of the automatic tensioning device (3) extends into the connecting section; the inserting section is adapted to the shape of the tapered shank of the tool handle (6) to be processed; a rivet (5) is threadedly connected to the rear end of the inner cavity of the tool handle (6) to be processed; the tool handle (6) to be processed and the rivet (5) are inserted into the mounting hole via the inserting section; the tapered shank of the tool handle (6) to be processed is accommodated in the inserting section; the clamping joint of the rivet (5) extends into the inner cavity of the automatic tensioning device (3) and is interference-fitted with the flap claw; the CNC lathe pull rod (2) is connected to the rivet (5); 3.2) Taper shank compound grinding: rough grinding to form the taper shank angle, and replace the fine-grained grinding wheel to fine-grind the taper; 3.3) Precision boring of rivet holes; 4) Quality assurance stage; 4.1) Comprehensive testing: key dimension testing and mechanical property testing; 4.2) Final surface treatment: ultrasonic cleaning and rust prevention treatment; 5) Digital management stage; 5.1) Process data traceability; 5.2) Smart warehousing.

2. According to claim 1, a CNC tool handle processing technology with multiple steps of turning instead of grinding is characterized by: The tool handle is a hardened steel CNC tool handle.

3. The CNC tool handle processing technology of claim 1, wherein: Before step 3), orthogonal tests on cutting speed, cutting depth and feed rate are performed to analyze surface roughness, outer circle size, V-groove measuring rod distance and geometric tolerance to obtain the optimal cutting parameter combination.

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