Die clamping without permanent hydraulic supply

A self-locking wedge clamp for safely securing dies on power presses and injection moulding machines, without the need for a permanent hydraulic supply, has been introduced by Roemheld UK.

Designed for clamping dies with straight edges, the element applies spring force for retention. A pressure of up to 160 bar is sufficient for release, which can be provided by the machine hydraulics.
Inclined at 6°, the clamping bolt approaches the die edge from the side, resulting in a self-locking connection, following which a spring applies frictional force that can be maintained over long periods of time. Inductive and optical position control deliver enhanced operational safety.
The robust, compact wedge clamp is coated to inhibit rusting and can withstand harsh environments including dirt and temperatures up to 160°C for high functional safety, even in the most challenging production processes. Tolerance for clamping edge height is ±0.5 mm, with spacer plates compensating for any deviation. Cylinder diameters are between 35 and 85 mm, while operating force is from 25 to 120 kN, depending on unit size.
In the standard range, the availability of four hydraulic connection variants provides flexibility for different assembly configurations. Modified wedge clamps can be supplied to suit customers’ specific applications. Additional versions are available for clamping on angled die edges, with permanent lubrication or multi-layer coating to improve wear properties. All clamping elements comply with the Euromap directives.
For further information www.roemheld.co.uk

At the heart of manufacturing

Last week, specifically 15 April, holds a special place in the history of the Manufacturing Technologies Association (MTA), as it was on that date in 1919 that the association was founded and the first meeting of its members held.

28th February 2019, Park Plaza Hotel, MTA

To mark the centenary, members past and present have been contributing to a book ‘At the Heart of Manufacturing’, which charts the history of the association from inception to the present day.
The book is also a record of how much technology has changed over the past 100 years; some of the manufacturing techniques of then would be unrecognisable today. The book was carefully put together by looking through historical records and recounting recent years. Every member of the MTA has received a copy of the publication, which was launched at the MTA’s centenary dinner in February.
For further information www.mta.org.uk

Boring tool can perform four operations

The CoroBore BC (Boring Combination) range of solutions, which comprises Tailor Made tools for high-volume applications, is being released by Sandvik Coromant.

Internal machining cross section – Tailor Made – CoroBore BC

Using CoroBore BC it is possible to perform different operations such as semi-finishing and chamfering with a single tool. Manufacturers set to benefit include those serving the automotive, general engineering and construction equipment sectors.
According to Sandvik Coromant, CoroBore BC offers a quick and easy alternative when standard tools do not match up to specific requirements, but the cost and delivery time of a specially engineered solution are prohibitive. The process is fast as Sandvik Coromant personnel utilise an online program that automatically creates the tool and provides price and delivery information.
“The productivity advantages offered by CoroBore BC tools are based on eliminating unnecessary tool changes and reducing cycle times,” says Jenny Nilsson, global product manager at Sandvik Coromant. “Among the many strengths of the new solution is the capability to offer these benefits at much shorter notice, thanks to an automated design and quoting process. The Sandvik Coromant representative simply goes through the required operations with the customer, and enters the parameters via a web-based design interface. Once this is complete, the system instantly produces the tool design and quote.”
Thanks to the various CoroBore BC options offered, a range of multi-step boring applications can be performed. Indeed, customers can choose from up to four machining operations in a single tool (a maximum of two cutting edges per operation). Cutting diameters range from 20 to 200 mm, while tool length can be up to 400 mm, depending on coupling size.
For further information www.sandvik.coromant.com

Reducing set-up times at job shop

When San Antonio-based job shop Anthony Machine purchased a pair of NLX 3000 1250 universal turning centres from CNC machine builder DMG Mori – the company’s first Y-axis, live-tool lathes – the team was challenged with making the most of its new investment.

Long-term tooling partner Kennametal explained to Anthony that the best way to reduce set-up times and maximise the new machines’ potential would be to equip them with Turret Adapted Clamping Units (TACU) and KM-series quick-change tool holders.
According to Anthony Machine manufacturing technologist Daniel Goller, the decision to adopt TACU and KM for the new machines was an easy one. “Over the years, we’ve built a number of KM-equipped custom tool holders for deep boring and other machining operations on our CNC lathes and machining centres, and we use Kennametal on several of the shop’s manual turret lathes to overcome limitations with available tool positions. On more than one occasion, we’ve earned new business because KM was able to achieve tolerances and surface finishes that others couldn’t do with conventional tooling.”
Anthony’s operations manager Mohsen Saleh agrees: “The differences are striking. Compared to the traditional wedge and screw-style blocks that come standard on most machines, the KM-equipped TACU units are both faster and more accurate. We routinely hold tolerances of 0.013 mm and I’m told that part size doesn’t change from one clamping to the next. The turret’s less crowded, everything’s easier to get at, and you don’t have the chatter and deflection that you often find with your typical straight shank tools and set-screw type boring bar holders.”
For further information www.kennametal.com

Mapal tools boost auto parts machining

As an internationally operating supplier to the automotive industry, Neapco is receiving an increasing number of enquiries for electric vehicle components.

A current electric vehicle project the company is undertaking is a drive shaft, which has been supported with cutting tools from Mapal.
Located in Düren in the North Rhine-Westphalia area in Germany, the company relies on Mapal ball-nose milling cutters for hard machining the outer face of the constant velocity joint of drive shafts.
Production of the latest line of drive shafts started at the beginning of 2018, and the volume will be as high as 35,000 units in 2019. “We use the ball nose milling cutters from Mapal to machine the ball raceways of what is known as the bell or axle spindle, for which strict tolerances are specified,” says Ahmet Simsek, who is in charge of tool management at the Neapco plant in Düren.
It is important that this drive shaft joint transmits the torque with as little influence on the steering as possible, even in the case of large working angles on the drive gears of front-wheel drive vehicles. This is why all requirements regarding quality, dimensions and surface qualities must be observed in a process-consistent manner. For example, the contact angle must be within a tolerance of ±5°.
Machining of the forged axle spindles on an EMAG VSC 250 Twin machining centre is assisted by the tool, which has four soldered PcBN blades to remove between 0.2 and 0.4 mm of material. The tool is connected to the tool holder via Mapal’s own HFS connection (Head Fitting System).
For further information www.mapal.com