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What Is Machine Mound Surface Knurling


Machine mound surface knurling is a specialized manufacturing process that involves creating a pattern of raised ridges or grooves on the surface of a workpiece.

This knurled texture provides enhanced grip, making it easier for users to handle and manipulate objects.

Machine mound surface knurling is widely used in various industries, including automotive, aerospace, consumer goods, and medical devices. In this article, we will explore the principles, techniques, applications, and benefits of machine mound surface knurling.

Understanding Knurling


Knurling is a manufacturing process used to create a textured pattern on the surface of a workpiece. It is typically performed on cylindrical or flat surfaces. The knurled pattern consists of diamond-shaped or straight-line ridges, imparting a rough texture to the surface. This texturing enhances grip, making the object easier to hold or turn.

Knurling is commonly used for applications where a secure grip is essential, such as on tool handles, knobs, handwheels, and other components that require precise manual control. Additionally, knurling is utilized for decorative purposes, adding an aesthetically appealing texture to products.

Machine Mound Surface Knurling: Overview


Machine mound surface knurling is a variation of traditional knurling techniques, where the knurled pattern is formed on raised mounds or platforms rather than directly on the workpiece surface. This process results in a unique knurled texture with distinct features and benefits.

The Knurling Process


The machine mound surface knurling process involves several steps, including:

  • Workpiece Preparation: The workpiece must be properly prepared before the knurling process begins. It is essential to ensure that the surface is clean and free from any contaminants or debris.
  • Knurling Tool Selection: The selection of the appropriate knurling tool is critical for achieving the desired knurled pattern. Knurling tools come in various patterns and sizes, allowing for flexibility in design.
  • Setting the Knurling Tool: The knurling tool is set to the desired depth and pressure to create the knurled pattern on the workpiece. The pressure should be carefully controlled to prevent excessive deformation or damage to the workpiece.
  • Machine Setup: The workpiece is securely mounted on the machine, and the knurling tool is aligned with the workpiece surface. Proper alignment ensures uniform and accurate knurling.
  • Knurling Process: The machine is set in motion, and the knurling tool is pressed against the workpiece surface, creating the knurled pattern on the machine mound. The tool may rotate, creating a diamond-shaped pattern, or move in a straight line, producing a straight-line knurl.
  • Quality Control: After knurling, the workpiece is inspected to ensure that the knurled pattern meets the required specifications. Any imperfections or deviations from the desired pattern are addressed at this stage.

Applications of Machine Mound Surface Knurling


Machine mound surface knurling finds a wide range of applications across various industries due to its unique benefits:

  • 1. Automotive Industry: In the automotive sector, machine mound surface knurling is often applied to various control components, such as gear shift knobs, steering wheel grips, and clutch pedals. The knurled texture enhances grip and improves the driver’s control over the vehicle.
  • 2. Medical Devices: Medical devices, such as surgical instruments, often utilize machine mound surface knurling to ensure a secure grip for surgeons during delicate procedures.
  • 3. Aerospace Industry: In aerospace applications, machine mound surface knurling is applied to control knobs, handles, and switches, where secure handling is critical for pilots and astronauts.
  • 4. Consumer Goods: Many consumer goods, such as flashlights, hand tools, and electronic devices, feature machine mound surface knurling to enhance user handling and aesthetics.
  • 5. Decorative Applications: In addition to functional purposes, machine mound surface knurling is used decoratively in high-end consumer products, providing an appealing texture and distinctive appearance.

Advantages of Machine Mound Surface Knurling


Machine mound surface knurling offers several advantages over traditional knurling techniques:

  • 1. Enhanced Grip: The machine mound surface knurled texture provides a more substantial and secure grip compared to standard knurling, which can be particularly beneficial in applications where precise handling is essential.
  • 2. Improved Aesthetics: The raised mounds created by machine mound surface knurling give a unique and aesthetically pleasing appearance to the workpiece, adding value to the final product.
  • 3. Versatility in Design: Machine mound surface knurling allows for greater design flexibility, as different knurling tool patterns can be used to achieve various textures and appearances.
  • 4. Increased Durability: The raised knurled mounds offer better wear resistance and durability, making the workpiece more robust and reliable in heavy-duty applications.
  • 5. Reduced Material Deformation: As the knurled pattern is formed on raised mounds, the risk of excessive material deformation or damage to the workpiece surface is minimized.

Machine mound surface knurling is a specialized manufacturing process that enhances grip and adds aesthetic appeal to a wide range of products in various industries. The process involves creating a knurled pattern on raised mounds or platforms, resulting in a distinctive texture and improved performance. From the automotive industry to medical devices and consumer goods, machine mound surface knurling plays a crucial role in providing a secure and comfortable grip for users. With its unique advantages, this knurling technique continues to find applications in diverse industries, contributing to the overall usability and aesthetics of precision-engineered products.

Surface knurling is a type of rolling process and also belongs to chip-free machining. It is on the surface of the machine tool operating parts and common tools, after rolling with a knurling knife, the surface is plastically deformed to form a pattern, so as to increase the friction of the hand of the fastener, save effort and increase beauty.

There are two kinds of knurled patterns: straight pattern and reticulated pattern, and sometimes in the form of twill pattern.

Their main parameter is the pattern pitch p. It reflects the thickness of the pattern. The machine tool generally adopts the machining method of milling gears, so it takes the gear series as the standard.

Knurling knives are available in single wheel, double wheel and six wheel. The double-wheel knurling knife is composed of two twill knurling knives with left and right rotations, which are used to roll the mesh. The six-wheel knurling knives consist of three sets of knurling knives with different mesh pitches assembled on a specially made shank for ease of use.

  • The selection of machine tool knurling knives should generally be selected according to the pattern shape and pitch p specified in the drawing.
  • Generally, the pitch should be selected according to the diameter of the workpiece and the width of the pattern. When the diameter and width of the workpiece are large, the thicker pattern should be selected, otherwise, the thinner pattern should be selected.
  • The clamping of the machine tool knurling tool is similar to that of the ordinary turning tool. After leveling the tool holder, adjust the center height of the knurling tool to be equal to the rotation center of the workpiece. In order to facilitate the gear teeth to cut the workpiece surface, the outer surface of the roller and the outer circle of the workpiece can be formed 2. ~3. The included angle in the clockwise direction, at the beginning of rolling, make the front end of the roller contact the workpiece first.
  • Operation step 1) Since the surface of the workpiece is plastically deformed during knurling, the outer circle increases, so according to the material properties and pitch p, the diameter to be knurled should be smaller than the nominal size p (0.25-0.5 ) mm.

Start the lathe, first align the front end of the workpiece with 1/2~1/3 of the width of the roller, feed with a larger radial force to reduce the rolling area of ​​the roller, increase the working pressure, and make the roller easy to press into the surface . When a deeper pattern is formed, longitudinal feed is carried out, and the rolling back and forth is repeated 2-3 times to make the pattern clear and beautiful.

Operational Points


  • When knurling, a lower cutting speed should be selected to prevent slippage between the roller and the surface of the workpiece, generally 7~15m/min.
  • The roller should rotate freely, and the matching accuracy of the hole diameter and the shaft, Should be selected according to H7/h8, especially the tolerance of coaxiality should be less than 0 0imm.
  • Although knurling is chip-free processing, during the rolling process, some chips will be generated, which are mixed on the rolling surface, which not only affects the quality of the knurling, but also affects the life of the roller. Therefore, in addition to filling a sufficient amount of cutting fluid, the machine tool should also remove debris and other impurities in time.
  • The radial force of knurling is large. Therefore, the machine tool should control the feed force appropriately. Finishing should also be arranged after knurling to prevent deformation of the workpiece.
  • The surface roughness value R of the workpiece before knurling. Should be around 6 3ym.
  • Do not touch the workpiece during knurling.

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