Performance Characteristics

I. General Introduction of the DEL-32C Crankshaft and Connecting Rod Neck CNC Machine Tool

This machine tool consists of a bed, left spindle box, right spindle box, left and right dedicated chucks, saddle, tool post, 12-station indexable circular tool disc, Siemens 828D or FANUC TF Plus CNC system, servo drive system, electrical system, hydraulic system, cooling and chip removal system, lubrication system, and protective system, etc. It adopts a highly rigid horizontal integral cast bed. The bed ways adopt rectangular sliding ways, which are integrated with the bed and are quenched and precision ground. A low-friction coefficient polytetrafluoroethylene wear-resistant soft belt is bonded to the friction surface between the sliding body and the guide rail, thereby improving the accuracy of the guide rail and extending the service life of the machine tool. The bed ways are inclined backward by 45°, making operation and tool adjustment more convenient and safe. Coupled with the fully enclosed protective device, it has a large chip removal space, making chip removal more smooth. Iron filings and coolant are directly discharged into a separate chain-plate type chip removal device and do not accumulate on the machine tool body.

The spindle drive system adopts an imported AC main drive motor. The main transmission adopts dual-spindle mechanical synchronous transmission. The main motor drives the mechanical synchronous shaft through a synchronous belt, and the gears on both sides of the mechanical synchronous shaft drive the chucks on the left and right spindles to rotate synchronously. The spindle bearings adopt three precision angular contact bearings and one precision-grade tapered roller rear bearing. This bearing arrangement not only gives the spindle certain rigidity and speed but also ensures that the spindle has low temperature rise and small thermal deformation.

The feed system consists of the X-axis and Z-axis. The X-axis and Z-axis are driven by imported servo motors respectively. Their combined movement realizes processes such as turning radii and sinking grooves. The tool disc can be arbitrarily indexed and continuously rotated for feeding. The tool post is an imported servo tool post, which can achieve high positioning accuracy and repeat positioning accuracy.

II. Main Technical Characteristics of DEL-32C Crankshaft and Connecting Rod Neck CNC Machine Tool

1. High-rigidity inclined integral bed

The machine tool adopts a 45° inclined integral bed, and the bed material is HT300. It is cast using resin sand technology, and the internal rib layout is reasonable. The guide rails adopt rectangular sliding guide rails, which are integrated with the bed and are quenched and precision ground. A low-friction coefficient polytetrafluoroethylene wear-resistant soft belt is bonded to the friction surface between the sliding body and the guide rail, thereby improving the accuracy of the guide rail and extending the service life of the machine tool.

2. High-speed, high-rigidity, high-precision spindle

The machine tool is equipped with two spindle boxes on the left and right. The left spindle box is fixed to the bed; the right spindle box is installed on the guide rail slide block, and its position is adjustable.

1) Left spindle box:

The spindle bearings in the left spindle box adopt three precision-grade angular contact ball bearings and one precision-grade tapered roller rear bearing, used to support the chuck that clamps the workpiece. The spindle box has a gear transmission mechanism, suitable for heavy cutting.

2) Right spindle box:

The structure of the right spindle box is similar to that of the left spindle box. The workpiece spindle is driven by the drive motor installed in the left spindle box through the synchronous transmission shaft between the left and right spindle boxes. To ensure that the spindles of the left and right spindle boxes rotate synchronously, the clamping sleeve connecting the synchronous transmission shaft and the right spindle box can be loosened, the left and right spindles can be adjusted to synchronization, and then the clamping sleeve can be tightened. After the workpiece is determined, the right spindle box must not be moved.

When replacing crankshafts of different lengths, if the auxiliary spindle box needs to be moved to the left, the left end face of the saddle needs to be moved to the right side of the auxiliary spindle box. After installing the adjustment plate, loosen the locking sleeve and the auxiliary spindle box pressure plate, move the saddle to the left, make the adjustment plate and the saddle body close tightly, and move the auxiliary spindle box to the left by moving the saddle; if the auxiliary spindle box needs to be moved to the right, the right end face of the saddle needs to be moved to the left side of the auxiliary spindle box. After installing the adjustment plate, loosen the locking sleeve and the auxiliary spindle box pressure plate, move the saddle to the right, make the adjustment plate and the saddle body close tightly, and move the auxiliary spindle box to the right by moving the saddle.

3. Feed system

The X and Z-axis feeds adopt a servo motor directly connected to a ball screw through a flexible coupling. The X-axis and Z-axis ball screws adopt a form of one end fixed and one end supported. During assembly, the pre-stretching caused by temperature rise is considered. This installation method can eliminate the positioning error caused by the elongation of the screw due to the increase in temperature during operation, maintaining the consistency of the workpiece processing accuracy.

4. Tool post

The standard tool post of this lathe adopts an imported servo electric tool post. This tool post adopts servo motor-driven indexing and can meet the requirements of high performance and quick tool change. This tool post can realize bidirectional proximity tool selection. By controlling the acceleration and deceleration process through servo motor technology, the tool post can still complete impact-free flexible indexing and positioning under high inertia load. This tool post is precisely manufactured, has few parts, reasonable design, low operating temperature, and long-lasting lubrication, ensuring its use accuracy and reliability during use.

5. Hydraulic and lubrication system

The hydraulic system uses a variable vane pump. The hydraulic oil tank is placed behind the bed and is isolated from the outside by protection. Each hydraulic circuit adopts a superimposed valve installation method, which is compact and easy to install. The pressure of each hydraulic cylinder in this hydraulic system can be adjusted separately and has a pressure protection device. The hydraulic oil tank has an air-cooled device. The standard configuration adopts a Sino-foreign joint venture centralized quantitative automatic lubrication system.

6. Cooling and chip removal system

The machine tool adopts full guide rail protection, convenient chip removal, and adopts a high-flow, high-head cooling pump. During turning, both the workpiece and the tool are sufficiently cooled, ensuring the processing accuracy of the workpiece and improving the service life of the tool. The chip remover standardly equipped with the machine tool is of the chain-plate type.

7. Fixture

The machine tool is equipped with a self-made hydraulic eccentric fixture, which is installed at the front end of the left and right spindle boxes and is driven by a motor through a synchronous lever.

8. Online measurement system

A detachable tool setter is installed at the end of the right spindle box. The contact-type tool setter is mounted on a detachable arm, which is installed on a fixed base on the left headstock. This base has a protective cover to protect the electrical connectors, ensuring normal use in an environment with cutting chips and coolant.

9. Electrical System

1) CNC and Servo Systems

The CNC system for this machine tool can be selected according to user requirements.

2) Machine Tool Electrical System

The machine tool's electrical design complies with GB-5226.1 electrical standards.

The power circuits have overcurrent and short-circuit protection. Relevant machine actions have corresponding interlocks to ensure equipment and personnel safety.

The electrical system has a self-diagnostic function. Operators and maintenance personnel can observe the operating status of various parts of the machine tool at any time using indicator lights and displays.

Major electrical components are imported products; other electrical components are from Sino-foreign joint ventures, ensuring the machine's safety and reliability.

CNC machine tools have strict power requirements. If the user's power grid fluctuates by more than ±10%, or the frequency exceeds 50Hz ±1Hz, a voltage regulator must be added; otherwise, the CNC machine tool will not work correctly, or even unpredictable results may occur.

3) Electrical Cabinet

The standard electrical cabinet is fully enclosed and equipped with an air conditioner for dust prevention and cooling. The electrical cabinet's protection level reaches IP54 requirements; and sufficient space is reserved inside the electrical cabinet for functional expansion.

10. Safety Protection

It features full guard protection and incorporates multiple safety measures, such as: electrical control cabinet safety devices, safety operating doors, and reinforced glass design for operating doors, ensuring both machine and personnel safety.

The Z-axis uses a telescopic protective cover with a slanted back design for easy chip removal and coolant collection. The cooling system uses multi-layer filtration for thorough coolant purification, preventing blockage of the cooling circuit.

When the machine encounters a sudden external power failure or internal malfunction, due to the special design of the control circuit, the machine's movable feed shafts and cooling motors, if already in the "start" state, will enter the "stop" state; if already in the "stop" state, they cannot automatically start, ensuring machine safety. Additionally, because the control program in the machine's computer is "fixed" in the chip, and the part processing program is protected by battery power, unexpected power outages or malfunctions will not cause loss of the programs stored in the computer.

The machine has an alarm system and an emergency stop button to prevent various sudden malfunctions from damaging the machine. Due to the reasonable software design, alarms are displayed as text and alarm numbers on the display and indicated by indicator lights on the control panel; the machine handles alarms in three ways depending on the situation: "emergency stop" for emergency alarms; "feed hold" for general alarms; and "prompt" for operational errors.

Technical Parameters

Machine Accuracy

Main Configuration

Standard Accessories

1. List of Standard Accessories

Remarks Other accessories shall be provided according to the machine tool's standard configuration to meet the requirements of parts processing.

2. List of Standard Documents